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dump.c

/* 
   Copyright (c) 1995-2000 by Cisco systems, Inc.

   Permission to use, copy, modify, and distribute modified and
   unmodified copies of this software for any purpose and without fee is
   hereby granted, provided that (a) this copyright and permission notice
   appear on all copies of the software and supporting documentation, (b)
   the name of Cisco Systems, Inc. not be used in advertising or
   publicity pertaining to distribution of the program without specific
   prior permission, and (c) notice be given in supporting documentation
   that use, modification, copying and distribution is by permission of
   Cisco Systems, Inc.

   Cisco Systems, Inc. makes no representations about the suitability
   of this software for any purpose.  THIS SOFTWARE IS PROVIDED ``AS
   IS'' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
   WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   FITNESS FOR A PARTICULAR PURPOSE.
*/

#include "tac_plus.h"

/* Routines for dumping packets to stderr */
char *
summarise_outgoing_packet_type(pak)
u_char *pak;
{
    HDR *hdr;
    struct authen_reply *authen;
    struct author_reply *author;
    char *p;

    hdr = (HDR *) pak;

    switch (hdr->type) {
    case TAC_PLUS_AUTHEN:
      authen = (struct authen_reply *) (pak + TAC_PLUS_HDR_SIZE);

      switch (authen->status) {
      case TAC_PLUS_AUTHEN_STATUS_PASS:
          p = "AUTHEN/SUCCEED";
          break;
      case TAC_PLUS_AUTHEN_STATUS_FAIL:
          p = "AUTHEN/FAIL";
          break;
      case TAC_PLUS_AUTHEN_STATUS_GETDATA:
          p = "AUTHEN/GETDATA";
          break;
      case TAC_PLUS_AUTHEN_STATUS_GETUSER:
          p = "AUTHEN/GETUSER";
          break;
      case TAC_PLUS_AUTHEN_STATUS_GETPASS:
          p = "AUTHEN/GETPASS";
          break;
      case TAC_PLUS_AUTHEN_STATUS_ERROR:
          p = "AUTHEN/ERROR";
          break;
      default:
          p = "AUTHEN/UNKNOWN";
          break;
      }
      break;

    case TAC_PLUS_AUTHOR:
      author = (struct author_reply *) (pak + TAC_PLUS_HDR_SIZE);
      switch (author->status) {
      case AUTHOR_STATUS_PASS_ADD:
          p = "AUTHOR/PASS_ADD";
          break;
      case AUTHOR_STATUS_FAIL:
          p = "AUTHOR/FAIL";
          break;
      case AUTHOR_STATUS_PASS_REPL:
          p = "AUTHOR/PASS_REPL";
          break;
      case AUTHOR_STATUS_ERROR:
          p = "AUTHOR/ERROR";
          break;
      default:
          p = "AUTHOR/UNKNOWN";
          break;
      }
      break;
    case TAC_PLUS_ACCT:
      p = "ACCT";
      break;
    default:
      p = "UNKNOWN";
      break;
    }
    return (p);
}

void
dump_header(pak)
u_char *pak;
{
    HDR *hdr;
    u_char *data;

    hdr = (HDR *) pak;

    report(LOG_DEBUG, "PACKET: key=%s", session.key ? session.key : "<NULL>");
    report(LOG_DEBUG, "version %d (0x%x), type %d, seq no %d, encryption %d",
         hdr->version, hdr->version, 
         hdr->type, hdr->seq_no, hdr->encryption);
    report(LOG_DEBUG, "session_id %u (0x%x), Data length %d (0x%x)",
         ntohl(hdr->session_id), ntohl(hdr->session_id),
         ntohl(hdr->datalength), ntohl(hdr->datalength));

    report(LOG_DEBUG, "End header");

    if (debug & DEBUG_HEX_FLAG) {
      report(LOG_DEBUG, "Packet body hex dump:");
      data = (u_char *) (pak + TAC_PLUS_HDR_SIZE);
      report_hex(LOG_DEBUG, data, ntohl(hdr->datalength));
    }
}


/* Dump packets originated by a NAS */
dump_nas_pak(pak)
u_char *pak;
{
    struct authen_start *start;
    struct authen_cont *cont;
    struct author *author;
    struct acct *acct;
    int i;
    HDR *hdr;
    u_char *p, *argsizep;
    int seq;

    dump_header(pak);

    hdr = (HDR *) pak;

    seq = hdr->seq_no;
    if (seq % 2 != 1) {
      report(LOG_DEBUG, "nas packets should be odd numbered seq=%d",
             seq);
      exit(1);
    }
    switch (hdr->type) {

    case TAC_PLUS_AUTHEN:
      start = (struct authen_start *) (pak + TAC_PLUS_HDR_SIZE);

      switch (hdr->seq_no) {

      case 1:
          report(LOG_DEBUG, "type=AUTHEN/START, priv_lvl = %d",
               start->priv_lvl);

          switch (start->action) {
          case TAC_PLUS_AUTHEN_LOGIN:
            report(LOG_DEBUG, "action=login");
            break;
          case TAC_PLUS_AUTHEN_CHPASS:
            report(LOG_DEBUG, "action=chpass");
            break;
          case TAC_PLUS_AUTHEN_SENDPASS:
            report(LOG_DEBUG, "action=sendpass");
            break;
          case TAC_PLUS_AUTHEN_SENDAUTH:
            report(LOG_DEBUG, "action=sendauth");
            break;
          default:
            report(LOG_DEBUG, "action=UNKNOWN %d", start->action);
            break;
          }

          switch(start->authen_type) {
          case TAC_PLUS_AUTHEN_TYPE_ASCII:
            report(LOG_DEBUG, "authen_type=ascii");
            break;
          case TAC_PLUS_AUTHEN_TYPE_PAP:
            report(LOG_DEBUG, "authen_type=pap");
            break;
          case TAC_PLUS_AUTHEN_TYPE_CHAP:
            report(LOG_DEBUG, "authen_type=chap");
            break;
          case TAC_PLUS_AUTHEN_TYPE_ARAP:
            report(LOG_DEBUG, "authen_type=arap");
            break;
          default:
            report(LOG_DEBUG, "authen_type=unknown %d", start->authen_type);
            break;
          }

          switch(start->service) {
            
          case TAC_PLUS_AUTHEN_SVC_LOGIN:
            report(LOG_DEBUG, "service=login");
            break;
          case TAC_PLUS_AUTHEN_SVC_ENABLE:
            report(LOG_DEBUG, "service=enable");
            break;
          case TAC_PLUS_AUTHEN_SVC_PPP:
            report(LOG_DEBUG, "service=ppp");
            break;
          case TAC_PLUS_AUTHEN_SVC_ARAP:
            report(LOG_DEBUG, "service=arap");
            break;
          case TAC_PLUS_AUTHEN_SVC_PT:
            report(LOG_DEBUG, "service=pt");
            break;
          case TAC_PLUS_AUTHEN_SVC_RCMD:
            report(LOG_DEBUG, "service=rcmd");
            break;
          case TAC_PLUS_AUTHEN_SVC_X25:
            report(LOG_DEBUG, "service=x25");
            break;
          case TAC_PLUS_AUTHEN_SVC_NASI:
            report(LOG_DEBUG, "service=nasi");
            break;
          default:
            report(LOG_DEBUG, "service=unknown %d", start->service);
            break;
          }

          report(LOG_DEBUG, 
               "user_len=%d port_len=%d (0x%x), rem_addr_len=%d (0x%x)",
               start->user_len, start->port_len, start->port_len,
               start->rem_addr_len, start->rem_addr_len);

          report(LOG_DEBUG, "data_len=%d", start->data_len);

          /* start of variable length data is here */
          p = pak + TAC_PLUS_HDR_SIZE + TAC_AUTHEN_START_FIXED_FIELDS_SIZE;

          report(LOG_DEBUG, "User: ");
          report_string(LOG_DEBUG, p, start->user_len);
          p += start->user_len;

          report(LOG_DEBUG, "port: ");
          report_string(LOG_DEBUG, p, start->port_len);
          p += start->port_len;

          report(LOG_DEBUG, "rem_addr: ");
          report_string(LOG_DEBUG, p, start->rem_addr_len);
          p += start->rem_addr_len;

          report(LOG_DEBUG, "data: ");
          report_string(LOG_DEBUG, p, start->data_len);

          report(LOG_DEBUG, "End packet");
          return;

      default:
          cont = (struct authen_cont *) (pak + TAC_PLUS_HDR_SIZE);
          report(LOG_DEBUG, "type=AUTHEN/CONT");
          report(LOG_DEBUG, "user_msg_len %d (0x%x), user_data_len %d (0x%x)",
               cont->user_msg_len, cont->user_msg_len,
               cont->user_data_len, cont->user_data_len);
          report(LOG_DEBUG, "flags=0x%x", cont->flags);

          /* start of variable length data is here */
          p = pak + TAC_PLUS_HDR_SIZE +
            TAC_AUTHEN_CONT_FIXED_FIELDS_SIZE;

          report(LOG_DEBUG, "User msg: ");
          report_string(LOG_DEBUG, p, cont->user_msg_len);
          p += cont->user_msg_len;

          report(LOG_DEBUG, "User data: ");
          report_string(LOG_DEBUG, p, cont->user_data_len);

          report(LOG_DEBUG, "End packet");
          return;
      }

    case TAC_PLUS_AUTHOR:
      author = (struct author *) (pak + TAC_PLUS_HDR_SIZE);

      report(LOG_DEBUG, "type=AUTHOR, priv_lvl=%d, authen=%d",
             author->priv_lvl, 
             author->authen_type);

      switch(author->authen_method) {
      case AUTHEN_METH_NONE:
            report(LOG_DEBUG, "method=none");
            break;          
      case AUTHEN_METH_KRB5:
            report(LOG_DEBUG, "method=krb5");
            break;          
      case AUTHEN_METH_LINE:
            report(LOG_DEBUG, "method=line");
            break;          
      case AUTHEN_METH_ENABLE:
            report(LOG_DEBUG, "method=enable");
            break;          
      case AUTHEN_METH_LOCAL:
            report(LOG_DEBUG, "method=local");
            break;          
      case AUTHEN_METH_TACACSPLUS:
            report(LOG_DEBUG, "method=tacacs+");
            break;          
      case AUTHEN_METH_RCMD:
            report(LOG_DEBUG, "method=rcmd");
            break;          
      default:
            report(LOG_DEBUG, "method=unknown %d", author->authen_method);
            break;          
      }

      report(LOG_DEBUG, "svc=%d user_len=%d port_len=%d rem_addr_len=%d",
             author->service, author->user_len, 
             author->port_len, author->rem_addr_len);

      report(LOG_DEBUG, "arg_cnt=%d", author->arg_cnt);

      /* variable length data start here */
      p = pak + TAC_PLUS_HDR_SIZE + TAC_AUTHOR_REQ_FIXED_FIELDS_SIZE;
      argsizep = p;
      p += author->arg_cnt;

      report(LOG_DEBUG, "User: ");
      report_string(LOG_DEBUG, p, author->user_len);
      p += author->user_len;

      report(LOG_DEBUG, "port: ");
      report_string(LOG_DEBUG, p, author->port_len);
      p += author->port_len;

      report(LOG_DEBUG, "rem_addr: ");
      report_string(LOG_DEBUG, p, author->rem_addr_len);
      p += author->rem_addr_len;

      for (i = 0; i < (int) author->arg_cnt; i++) {
          report(LOG_DEBUG, "arg[%d]: size=%d ", i, *argsizep);
          report_string(LOG_DEBUG, p, *argsizep);
          p += *argsizep;
          argsizep++;
      }
      break;

    case TAC_PLUS_ACCT:
      acct = (struct acct *) (pak + TAC_PLUS_HDR_SIZE);
      report(LOG_DEBUG, "ACCT, flags=0x%x method=%d priv_lvl=%d",
             acct->flags, acct->authen_method, acct->priv_lvl);
      report(LOG_DEBUG, "type=%d svc=%d",
             acct->authen_type, acct->authen_service);
      report(LOG_DEBUG, "user_len=%d port_len=%d rem_addr_len=%d",
             acct->user_len, acct->port_len, acct->rem_addr_len);
      report(LOG_DEBUG, "arg_cnt=%d", acct->arg_cnt);

      p = pak + TAC_PLUS_HDR_SIZE + TAC_ACCT_REQ_FIXED_FIELDS_SIZE;
      argsizep = p;
      p += acct->arg_cnt;

      report(LOG_DEBUG, "User: ");
      report_string(LOG_DEBUG, p, acct->user_len);
      p += acct->user_len;

      report(LOG_DEBUG, "port: ");
      report_string(LOG_DEBUG, p, acct->port_len);
      p += acct->port_len;

      report(LOG_DEBUG, "rem_addr: ");
      report_string(LOG_DEBUG, p, acct->rem_addr_len);
      p += acct->rem_addr_len;

      for (i = 0; i < (int) acct->arg_cnt; i++) {
          report(LOG_DEBUG, "arg[%d]: size=%d ", i, *argsizep);
          report_string(LOG_DEBUG, p, *argsizep);
          p += *argsizep;
          argsizep++;
      }
      break;

    default:
      report(LOG_DEBUG, "dump_nas_pak: unrecognized header type %d", hdr->type);
    }
    report(LOG_DEBUG, "End packet");
}

/* Dump packets originated by Tacacsd  */

dump_tacacs_pak(pak)
u_char *pak;
{
    struct authen_reply *authen;
    struct author_reply *author;
    struct acct_reply *acct;
    HDR *hdr;
    u_char *p, *argsizep;
    int i;
    int seq;

    dump_header(pak);

    hdr = (HDR *) pak;
    seq = hdr->seq_no;

    if (seq % 2 != 0) {
      report(LOG_ERR, "%s: Bad sequence number %d should be even", 
             session.peer, seq);
      tac_exit(1);
    }
    switch (hdr->type) {

    case TAC_PLUS_AUTHEN:
      authen = (struct authen_reply *) (pak + TAC_PLUS_HDR_SIZE);

      report(LOG_DEBUG, "type=AUTHEN status=%d (%s) flags=0x%x",
             authen->status, summarise_outgoing_packet_type(pak),
             authen->flags);

      report(LOG_DEBUG, "msg_len=%d, data_len=%d",
             authen->msg_len, authen->data_len);

      /* start of variable length data is here */
      p = pak + TAC_PLUS_HDR_SIZE + TAC_AUTHEN_REPLY_FIXED_FIELDS_SIZE;

      report(LOG_DEBUG, "msg: ");
      report_string(LOG_DEBUG, p, authen->msg_len);
      p += authen->msg_len;

      report(LOG_DEBUG, "data: ");
      report_string(LOG_DEBUG, p, authen->data_len);

      report(LOG_DEBUG, "End packet");
      return;

    case TAC_PLUS_AUTHOR:
      author = (struct author_reply *) (pak + TAC_PLUS_HDR_SIZE);

      report(LOG_DEBUG, "type=AUTHOR/REPLY status=%d (%s) ",
             author->status, summarise_outgoing_packet_type(pak));
      report(LOG_DEBUG, "msg_len=%d, data_len=%d arg_cnt=%d",
             author->msg_len, author->data_len, author->arg_cnt);

      /* start of variable length data is here */
      p = pak + TAC_PLUS_HDR_SIZE + TAC_AUTHOR_REPLY_FIXED_FIELDS_SIZE;

      /* arg sizes come next */
      argsizep = p;

      p += author->arg_cnt;

      report(LOG_DEBUG, "msg: ");
      report_string(LOG_DEBUG, p, author->msg_len);
      p += author->msg_len;

      report(LOG_DEBUG, "data: ");
      report_string(LOG_DEBUG, p, author->data_len);
      p += author->data_len;

      /* args follow */
      for (i = 0; i < (int) author->arg_cnt; i++) {
          int size = argsizep[i];

          report(LOG_DEBUG, "arg[%d] size=%d ", i, size);
          report_string(LOG_DEBUG, p, size);
          p += size;
      }
      break;

    case TAC_PLUS_ACCT:
      acct = (struct acct_reply *) (pak + TAC_PLUS_HDR_SIZE);
      report(LOG_DEBUG, "ACCT/REPLY status=%d", acct->status);

      report(LOG_DEBUG, "msg_len=%d data_len=%d",
             acct->msg_len, acct->data_len);

      p = pak + TAC_PLUS_HDR_SIZE + TAC_ACCT_REPLY_FIXED_FIELDS_SIZE;

      report(LOG_DEBUG, "msg: ");
      
      report_string(LOG_DEBUG, p, acct->msg_len);
      p += acct->msg_len;

      report(LOG_DEBUG, "data: ");
      report_string(LOG_DEBUG, p, acct->data_len);

      break;

    default:
      report(LOG_DEBUG, "dump_tacacs_pak: unrecognized header type %d",
             hdr->type);
    }
    report(LOG_DEBUG, "End packet");
}

/* summarise packet types for logging routines. */
char *
summarise_incoming_packet_type(pak)
u_char *pak;
{
    HDR *hdr;
    char *p;

    hdr = (HDR *) pak;

    switch (hdr->type) {
    case TAC_PLUS_AUTHEN:
      switch (hdr->seq_no) {
      case 1:
          p = "AUTHEN/START";
          break;
      default:
          p = "AUTHEN/CONT";
          break;
      }
      return (p);

    case TAC_PLUS_AUTHOR:
      p = "AUTHOR";
      break;
    case TAC_PLUS_ACCT:
      p = "ACCT";
      break;
    default:
      p = "UNKNOWN";
      break;
    }
    return (p);
}

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