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freebsd-nq/contrib/tcpdump/print-telnet.c
Ed Maste 0bff6a5af8 Update tcpdump to 4.9.2 
It contains many fixes, including bounds checking, buffer overflows (in
SLIP and bittok2str_internal), buffer over-reads, and infinite loops.

One other notable change:
  Do not use getprotobynumber() for protocol name resolution.
  Do not do any protocol name resolution if -n is specified.

Submitted by:	gordon
Reviewed by:	delphij, emaste, glebius
MFC after:	1 week
Relnotes:	Yes
Security:	CVE-2017-11108, CVE-2017-11541, CVE-2017-11542
Security:	CVE-2017-11543, CVE-2017-12893, CVE-2017-12894
Security:	CVE-2017-12895, CVE-2017-12896, CVE-2017-12897
Security:	CVE-2017-12898, CVE-2017-12899, CVE-2017-12900
Security:	CVE-2017-12901, CVE-2017-12902, CVE-2017-12985
Security:	CVE-2017-12986, CVE-2017-12987, CVE-2017-12988
Security:	CVE-2017-12989, CVE-2017-12990, CVE-2017-12991
Security:	CVE-2017-12992, CVE-2017-12993, CVE-2017-12994
Security:	CVE-2017-12995, CVE-2017-12996, CVE-2017-12997
Security:	CVE-2017-12998, CVE-2017-12999, CVE-2017-13000
Security:	CVE-2017-13001, CVE-2017-13002, CVE-2017-13003
Security:	CVE-2017-13004, CVE-2017-13005, CVE-2017-13006
Security:	CVE-2017-13007, CVE-2017-13008, CVE-2017-13009
Security:	CVE-2017-13010, CVE-2017-13011, CVE-2017-13012
Security:	CVE-2017-13013, CVE-2017-13014, CVE-2017-13015
Security:	CVE-2017-13016, CVE-2017-13017, CVE-2017-13018
Security:	CVE-2017-13019, CVE-2017-13020, CVE-2017-13021
Security:	CVE-2017-13022, CVE-2017-13023, CVE-2017-13024
Security:	CVE-2017-13025, CVE-2017-13026, CVE-2017-13027
Security:	CVE-2017-13028, CVE-2017-13029, CVE-2017-13030
Security:	CVE-2017-13031, CVE-2017-13032, CVE-2017-13033
Security:	CVE-2017-13034, CVE-2017-13035, CVE-2017-13036
Security:	CVE-2017-13037, CVE-2017-13038, CVE-2017-13039
Security:	CVE-2017-13040, CVE-2017-13041, CVE-2017-13042
Security:	CVE-2017-13043, CVE-2017-13044, CVE-2017-13045
Security:	CVE-2017-13046, CVE-2017-13047, CVE-2017-13048
Security:	CVE-2017-13049, CVE-2017-13050, CVE-2017-13051
Security:	CVE-2017-13052, CVE-2017-13053, CVE-2017-13054
Security:	CVE-2017-13055, CVE-2017-13687, CVE-2017-13688
Security:	CVE-2017-13689, CVE-2017-13690, CVE-2017-13725
Differential Revision:	https://reviews.freebsd.org/D12404
2017-12-06 02:21:11 +00:00

558 lines
15 KiB
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/* $NetBSD: print-telnet.c,v 1.2 1999/10/11 12:40:12 sjg Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Simon J. Gerraty.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* @(#)Copyright (c) 1994, Simon J. Gerraty.
*
* This is free software. It comes with NO WARRANTY.
* Permission to use, modify and distribute this source code
* is granted subject to the following conditions.
* 1/ that the above copyright notice and this notice
* are preserved in all copies.
*/
/* \summary: Telnet option printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include <stdio.h>
#include "netdissect.h"
static const char tstr[] = " [|telnet]";
#define TELCMDS
#define TELOPTS
/* NetBSD: telnet.h,v 1.9 2001/06/11 01:50:50 wiz Exp */
/*
* Definitions for the TELNET protocol.
*/
#define IAC 255 /* interpret as command: */
#define DONT 254 /* you are not to use option */
#define DO 253 /* please, you use option */
#define WONT 252 /* I won't use option */
#define WILL 251 /* I will use option */
#define SB 250 /* interpret as subnegotiation */
#define GA 249 /* you may reverse the line */
#define EL 248 /* erase the current line */
#define EC 247 /* erase the current character */
#define AYT 246 /* are you there */
#define AO 245 /* abort output--but let prog finish */
#define IP 244 /* interrupt process--permanently */
#define BREAK 243 /* break */
#define DM 242 /* data mark--for connect. cleaning */
#define NOP 241 /* nop */
#define SE 240 /* end sub negotiation */
#define EOR 239 /* end of record (transparent mode) */
#define ABORT 238 /* Abort process */
#define SUSP 237 /* Suspend process */
#define xEOF 236 /* End of file: EOF is already used... */
#define SYNCH 242 /* for telfunc calls */
#ifdef TELCMDS
static const char *telcmds[] = {
"EOF", "SUSP", "ABORT", "EOR",
"SE", "NOP", "DMARK", "BRK", "IP", "AO", "AYT", "EC",
"EL", "GA", "SB", "WILL", "WONT", "DO", "DONT", "IAC", 0,
};
#else
extern char *telcmds[];
#endif
#define TELCMD_FIRST xEOF
#define TELCMD_LAST IAC
#define TELCMD_OK(x) ((unsigned int)(x) <= TELCMD_LAST && \
(unsigned int)(x) >= TELCMD_FIRST)
#define TELCMD(x) telcmds[(x)-TELCMD_FIRST]
/* telnet options */
#define TELOPT_BINARY 0 /* 8-bit data path */
#define TELOPT_ECHO 1 /* echo */
#define TELOPT_RCP 2 /* prepare to reconnect */
#define TELOPT_SGA 3 /* suppress go ahead */
#define TELOPT_NAMS 4 /* approximate message size */
#define TELOPT_STATUS 5 /* give status */
#define TELOPT_TM 6 /* timing mark */
#define TELOPT_RCTE 7 /* remote controlled transmission and echo */
#define TELOPT_NAOL 8 /* negotiate about output line width */
#define TELOPT_NAOP 9 /* negotiate about output page size */
#define TELOPT_NAOCRD 10 /* negotiate about CR disposition */
#define TELOPT_NAOHTS 11 /* negotiate about horizontal tabstops */
#define TELOPT_NAOHTD 12 /* negotiate about horizontal tab disposition */
#define TELOPT_NAOFFD 13 /* negotiate about formfeed disposition */
#define TELOPT_NAOVTS 14 /* negotiate about vertical tab stops */
#define TELOPT_NAOVTD 15 /* negotiate about vertical tab disposition */
#define TELOPT_NAOLFD 16 /* negotiate about output LF disposition */
#define TELOPT_XASCII 17 /* extended ascic character set */
#define TELOPT_LOGOUT 18 /* force logout */
#define TELOPT_BM 19 /* byte macro */
#define TELOPT_DET 20 /* data entry terminal */
#define TELOPT_SUPDUP 21 /* supdup protocol */
#define TELOPT_SUPDUPOUTPUT 22 /* supdup output */
#define TELOPT_SNDLOC 23 /* send location */
#define TELOPT_TTYPE 24 /* terminal type */
#define TELOPT_EOR 25 /* end or record */
#define TELOPT_TUID 26 /* TACACS user identification */
#define TELOPT_OUTMRK 27 /* output marking */
#define TELOPT_TTYLOC 28 /* terminal location number */
#define TELOPT_3270REGIME 29 /* 3270 regime */
#define TELOPT_X3PAD 30 /* X.3 PAD */
#define TELOPT_NAWS 31 /* window size */
#define TELOPT_TSPEED 32 /* terminal speed */
#define TELOPT_LFLOW 33 /* remote flow control */
#define TELOPT_LINEMODE 34 /* Linemode option */
#define TELOPT_XDISPLOC 35 /* X Display Location */
#define TELOPT_OLD_ENVIRON 36 /* Old - Environment variables */
#define TELOPT_AUTHENTICATION 37/* Authenticate */
#define TELOPT_ENCRYPT 38 /* Encryption option */
#define TELOPT_NEW_ENVIRON 39 /* New - Environment variables */
#define TELOPT_EXOPL 255 /* extended-options-list */
#define NTELOPTS (1+TELOPT_NEW_ENVIRON)
#ifdef TELOPTS
static const char *telopts[NTELOPTS+1] = {
"BINARY", "ECHO", "RCP", "SUPPRESS GO AHEAD", "NAME",
"STATUS", "TIMING MARK", "RCTE", "NAOL", "NAOP",
"NAOCRD", "NAOHTS", "NAOHTD", "NAOFFD", "NAOVTS",
"NAOVTD", "NAOLFD", "EXTEND ASCII", "LOGOUT", "BYTE MACRO",
"DATA ENTRY TERMINAL", "SUPDUP", "SUPDUP OUTPUT",
"SEND LOCATION", "TERMINAL TYPE", "END OF RECORD",
"TACACS UID", "OUTPUT MARKING", "TTYLOC",
"3270 REGIME", "X.3 PAD", "NAWS", "TSPEED", "LFLOW",
"LINEMODE", "XDISPLOC", "OLD-ENVIRON", "AUTHENTICATION",
"ENCRYPT", "NEW-ENVIRON",
0,
};
#define TELOPT_FIRST TELOPT_BINARY
#define TELOPT_LAST TELOPT_NEW_ENVIRON
#define TELOPT_OK(x) ((unsigned int)(x) <= TELOPT_LAST)
#define TELOPT(x) telopts[(x)-TELOPT_FIRST]
#endif
/* sub-option qualifiers */
#define TELQUAL_IS 0 /* option is... */
#define TELQUAL_SEND 1 /* send option */
#define TELQUAL_INFO 2 /* ENVIRON: informational version of IS */
#define TELQUAL_REPLY 2 /* AUTHENTICATION: client version of IS */
#define TELQUAL_NAME 3 /* AUTHENTICATION: client version of IS */
#define LFLOW_OFF 0 /* Disable remote flow control */
#define LFLOW_ON 1 /* Enable remote flow control */
#define LFLOW_RESTART_ANY 2 /* Restart output on any char */
#define LFLOW_RESTART_XON 3 /* Restart output only on XON */
/*
* LINEMODE suboptions
*/
#define LM_MODE 1
#define LM_FORWARDMASK 2
#define LM_SLC 3
#define MODE_EDIT 0x01
#define MODE_TRAPSIG 0x02
#define MODE_ACK 0x04
#define MODE_SOFT_TAB 0x08
#define MODE_LIT_ECHO 0x10
#define MODE_MASK 0x1f
#define SLC_SYNCH 1
#define SLC_BRK 2
#define SLC_IP 3
#define SLC_AO 4
#define SLC_AYT 5
#define SLC_EOR 6
#define SLC_ABORT 7
#define SLC_EOF 8
#define SLC_SUSP 9
#define SLC_EC 10
#define SLC_EL 11
#define SLC_EW 12
#define SLC_RP 13
#define SLC_LNEXT 14
#define SLC_XON 15
#define SLC_XOFF 16
#define SLC_FORW1 17
#define SLC_FORW2 18
#define SLC_MCL 19
#define SLC_MCR 20
#define SLC_MCWL 21
#define SLC_MCWR 22
#define SLC_MCBOL 23
#define SLC_MCEOL 24
#define SLC_INSRT 25
#define SLC_OVER 26
#define SLC_ECR 27
#define SLC_EWR 28
#define SLC_EBOL 29
#define SLC_EEOL 30
#define NSLC 30
/*
* For backwards compatibility, we define SLC_NAMES to be the
* list of names if SLC_NAMES is not defined.
*/
#define SLC_NAMELIST "0", "SYNCH", "BRK", "IP", "AO", "AYT", "EOR", \
"ABORT", "EOF", "SUSP", "EC", "EL", "EW", "RP", \
"LNEXT", "XON", "XOFF", "FORW1", "FORW2", \
"MCL", "MCR", "MCWL", "MCWR", "MCBOL", \
"MCEOL", "INSRT", "OVER", "ECR", "EWR", \
"EBOL", "EEOL", \
0,
#ifdef SLC_NAMES
const char *slc_names[] = {
SLC_NAMELIST
};
#else
extern char *slc_names[];
#define SLC_NAMES SLC_NAMELIST
#endif
#define SLC_NAME_OK(x) ((unsigned int)(x) <= NSLC)
#define SLC_NAME(x) slc_names[x]
#define SLC_NOSUPPORT 0
#define SLC_CANTCHANGE 1
#define SLC_VARIABLE 2
#define SLC_DEFAULT 3
#define SLC_LEVELBITS 0x03
#define SLC_FUNC 0
#define SLC_FLAGS 1
#define SLC_VALUE 2
#define SLC_ACK 0x80
#define SLC_FLUSHIN 0x40
#define SLC_FLUSHOUT 0x20
#define OLD_ENV_VAR 1
#define OLD_ENV_VALUE 0
#define NEW_ENV_VAR 0
#define NEW_ENV_VALUE 1
#define ENV_ESC 2
#define ENV_USERVAR 3
/*
* AUTHENTICATION suboptions
*/
/*
* Who is authenticating who ...
*/
#define AUTH_WHO_CLIENT 0 /* Client authenticating server */
#define AUTH_WHO_SERVER 1 /* Server authenticating client */
#define AUTH_WHO_MASK 1
#define AUTHTYPE_NULL 0
#define AUTHTYPE_KERBEROS_V4 1
#define AUTHTYPE_KERBEROS_V5 2
#define AUTHTYPE_SPX 3
#define AUTHTYPE_MINK 4
#define AUTHTYPE_CNT 5
#define AUTHTYPE_TEST 99
#ifdef AUTH_NAMES
const char *authtype_names[] = {
"NULL", "KERBEROS_V4", "KERBEROS_V5", "SPX", "MINK", 0,
};
#else
extern char *authtype_names[];
#endif
#define AUTHTYPE_NAME_OK(x) ((unsigned int)(x) < AUTHTYPE_CNT)
#define AUTHTYPE_NAME(x) authtype_names[x]
/*
* ENCRYPTion suboptions
*/
#define ENCRYPT_IS 0 /* I pick encryption type ... */
#define ENCRYPT_SUPPORT 1 /* I support encryption types ... */
#define ENCRYPT_REPLY 2 /* Initial setup response */
#define ENCRYPT_START 3 /* Am starting to send encrypted */
#define ENCRYPT_END 4 /* Am ending encrypted */
#define ENCRYPT_REQSTART 5 /* Request you start encrypting */
#define ENCRYPT_REQEND 6 /* Request you send encrypting */
#define ENCRYPT_ENC_KEYID 7
#define ENCRYPT_DEC_KEYID 8
#define ENCRYPT_CNT 9
#define ENCTYPE_ANY 0
#define ENCTYPE_DES_CFB64 1
#define ENCTYPE_DES_OFB64 2
#define ENCTYPE_CNT 3
#ifdef ENCRYPT_NAMES
const char *encrypt_names[] = {
"IS", "SUPPORT", "REPLY", "START", "END",
"REQUEST-START", "REQUEST-END", "ENC-KEYID", "DEC-KEYID",
0,
};
const char *enctype_names[] = {
"ANY", "DES_CFB64", "DES_OFB64", 0,
};
#else
extern char *encrypt_names[];
extern char *enctype_names[];
#endif
#define ENCRYPT_NAME_OK(x) ((unsigned int)(x) < ENCRYPT_CNT)
#define ENCRYPT_NAME(x) encrypt_names[x]
#define ENCTYPE_NAME_OK(x) ((unsigned int)(x) < ENCTYPE_CNT)
#define ENCTYPE_NAME(x) enctype_names[x]
/* normal */
static const char *cmds[] = {
"IS", "SEND", "INFO",
};
/* 37: Authentication */
static const char *authcmd[] = {
"IS", "SEND", "REPLY", "NAME",
};
static const char *authtype[] = {
"NULL", "KERBEROS_V4", "KERBEROS_V5", "SPX", "MINK",
"SRP", "RSA", "SSL", NULL, NULL,
"LOKI", "SSA", "KEA_SJ", "KEA_SJ_INTEG", "DSS",
"NTLM",
};
/* 38: Encryption */
static const char *enccmd[] = {
"IS", "SUPPORT", "REPLY", "START", "END",
"REQUEST-START", "REQUEST-END", "END_KEYID", "DEC_KEYID",
};
static const char *enctype[] = {
"NULL", "DES_CFB64", "DES_OFB64", "DES3_CFB64", "DES3_OFB64",
NULL, "CAST5_40_CFB64", "CAST5_40_OFB64", "CAST128_CFB64", "CAST128_OFB64",
};
#define STR_OR_ID(x, tab) \
(((x) < sizeof(tab)/sizeof(tab[0]) && tab[(x)]) ? tab[(x)] : numstr(x))
static char *
numstr(int x)
{
static char buf[20];
snprintf(buf, sizeof(buf), "%#x", x);
return buf;
}
/* sp points to IAC byte */
static int
telnet_parse(netdissect_options *ndo, const u_char *sp, u_int length, int print)
{
int i, x;
u_int c;
const u_char *osp, *p;
#define FETCH(c, sp, length) \
do { \
if (length < 1) \
goto pktend; \
ND_TCHECK(*sp); \
c = *sp++; \
length--; \
} while (0)
osp = sp;
FETCH(c, sp, length);
if (c != IAC)
goto pktend;
FETCH(c, sp, length);
if (c == IAC) { /* <IAC><IAC>! */
if (print)
ND_PRINT((ndo, "IAC IAC"));
goto done;
}
i = c - TELCMD_FIRST;
if (i < 0 || i > IAC - TELCMD_FIRST)
goto pktend;
switch (c) {
case DONT:
case DO:
case WONT:
case WILL:
case SB:
/* DONT/DO/WONT/WILL x */
FETCH(x, sp, length);
if (x >= 0 && x < NTELOPTS) {
if (print)
ND_PRINT((ndo, "%s %s", telcmds[i], telopts[x]));
} else {
if (print)
ND_PRINT((ndo, "%s %#x", telcmds[i], x));
}
if (c != SB)
break;
/* IAC SB .... IAC SE */
p = sp;
while (length > (u_int)(p + 1 - sp)) {
ND_TCHECK2(*p, 2);
if (p[0] == IAC && p[1] == SE)
break;
p++;
}
ND_TCHECK(*p);
if (*p != IAC)
goto pktend;
switch (x) {
case TELOPT_AUTHENTICATION:
if (p <= sp)
break;
FETCH(c, sp, length);
if (print)
ND_PRINT((ndo, " %s", STR_OR_ID(c, authcmd)));
if (p <= sp)
break;
FETCH(c, sp, length);
if (print)
ND_PRINT((ndo, " %s", STR_OR_ID(c, authtype)));
break;
case TELOPT_ENCRYPT:
if (p <= sp)
break;
FETCH(c, sp, length);
if (print)
ND_PRINT((ndo, " %s", STR_OR_ID(c, enccmd)));
if (p <= sp)
break;
FETCH(c, sp, length);
if (print)
ND_PRINT((ndo, " %s", STR_OR_ID(c, enctype)));
break;
default:
if (p <= sp)
break;
FETCH(c, sp, length);
if (print)
ND_PRINT((ndo, " %s", STR_OR_ID(c, cmds)));
break;
}
while (p > sp) {
FETCH(x, sp, length);
if (print)
ND_PRINT((ndo, " %#x", x));
}
/* terminating IAC SE */
if (print)
ND_PRINT((ndo, " SE"));
sp += 2;
break;
default:
if (print)
ND_PRINT((ndo, "%s", telcmds[i]));
goto done;
}
done:
return sp - osp;
trunc:
ND_PRINT((ndo, "%s", tstr));
pktend:
return -1;
#undef FETCH
}
void
telnet_print(netdissect_options *ndo, const u_char *sp, u_int length)
{
int first = 1;
const u_char *osp;
int l;
osp = sp;
ND_TCHECK(*sp);
while (length > 0 && *sp == IAC) {
/*
* Parse the Telnet command without printing it,
* to determine its length.
*/
l = telnet_parse(ndo, sp, length, 0);
if (l < 0)
break;
/*
* now print it
*/
if (ndo->ndo_Xflag && 2 < ndo->ndo_vflag) {
if (first)
ND_PRINT((ndo, "\nTelnet:"));
hex_print_with_offset(ndo, "\n", sp, l, sp - osp);
if (l > 8)
ND_PRINT((ndo, "\n\t\t\t\t"));
else
ND_PRINT((ndo, "%*s\t", (8 - l) * 3, ""));
} else
ND_PRINT((ndo, "%s", (first) ? " [telnet " : ", "));
(void)telnet_parse(ndo, sp, length, 1);
first = 0;
sp += l;
length -= l;
ND_TCHECK(*sp);
}
if (!first) {
if (ndo->ndo_Xflag && 2 < ndo->ndo_vflag)
ND_PRINT((ndo, "\n"));
else
ND_PRINT((ndo, "]"));
}
return;
trunc:
ND_PRINT((ndo, "%s", tstr));
}
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