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/*
* XMail by Davide Libenzi ( Intranet and Internet mail server )
* Copyright (C) 1999,..,2004 Davide Libenzi
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#include "SysInclude.h"
#include "SysDep.h"
#include "SvrDefines.h"
#include "ShBlocks.h"
#include "StrUtils.h"
#include "SList.h"
#include "MailConfig.h"
#include "MailSvr.h"
#include "MiscUtils.h"
#include "TACACS.h"
/*
#define ERR_TACACS_AUTH_FAILED (-???)
#define ERR_TACACS_AUTH_UNAVAILABLE (-???)
#define ERR_TACACS_FILE_NOT_FOUND (-???)
#define ERR_TACACS_SERVER_NOT_FOUND (-???)
{ERR_TACACS_AUTH_FAILED, "TACACS authentication failed", NULL},
{ERR_TACACS_AUTH_UNAVAILABLE, "TACACS authentication server unavailable", NULL},
{ERR_TACACS_FILE_NOT_FOUND, "TACACS configuration file not found", NULL},
{ERR_TACACS_SERVER_NOT_FOUND, "TACACS server for domain not found", NULL},
*/
#define TACACS_TIMEOUT 15
#define TACACS_SEND_RETRIES 3
#define TACACS_DPORT 110
#define TACACS_LPORT 0
#define TACS_CONFIG_FILE "tacacsservers.tab"
#define TACS_ALIAS_LINE_MAX 1024
#define TACACS_SVC_NAME "tacacs"
#define TACACS_PORT 49
#define XTA_VERSION 0x80
#define TA_QUERY 1
#define TA_ANSWER 2
#define TA_CHANGE 3
#define TA_FOLLOW 4
#define TA_A_ACCEPTED 1
#define TA_A_REJECTED 2
#define TA_A_NONE 0
#define TA_A_EXPIRING 1
#define TA_A_PASSWORD 2
#define TA_A_DENIED 3
#define TA_A_NOROUTE 8 /* Dialup routing not allowed */
#define TA_A_LOGINREQ 9 /* Login required for requested action */
#define XTACACSSIZE sizeof(xtacacstype)
#define XTA_LOGIN 1
#define XTA_ANSWER 2
#define XTA_CHANGE 3
#define XTA_FOLLOW 4
#define XTA_CONNECT 5
#define XTA_ENABLE 6
#define XTA_LOGOUT 7
#define XTA_RELOAD 8
#define XTA_SLIPON 9
#define XTA_SLIPOFF 10
#define XTA_SLIPADDR 11
#define XTA_ARAP_AUTH 12
#define XTA_CHAP_AUTH 13
#define XTA_A_ACCEPTED 1
#define XTA_A_REJECTED 2
#define XTA_A_NONE 0
#define XTA_A_EXPIRING 1 /* Account expiring */
#define XTA_A_PASSWORD 2 /* Wrong password */
#define XTA_A_DENIED 3 /* Permission denied */
#define XTA_A_NOROUTE 8 /* Dialup routing not permitted */
#define XTA_A_LOGINREQ 9 /* Login required for requested action */
enum TacsFields {
tacsDomain = 0,
tacsServer,
tacsPort,
tacsMax
};
struct xtacacstype {
SYS_UINT8 version; /* version of protocol */
SYS_UINT8 type; /* Type of query/response */
SYS_UINT16 trans; /* transaction ID */
SYS_UINT8 namelen; /* length of name */
SYS_UINT8 pwlen; /* length of password */
SYS_UINT8 response; /* response code */
SYS_UINT8 reason; /* reason for response */
SYS_UINT32 uuid; /* user id code assigned */
SYS_UINT32 dhost; /* destination host */
SYS_UINT16 dport; /* destination port */
SYS_UINT16 lport; /* local line number */
SYS_UINT32 flags; /* misc flags */
SYS_UINT16 accesslist; /* access list for user */
/* user name[] */
/* password[] */
};
static char *TacsGetConfigFilePath(char *pszTacsFile);
static int TacsGetServerName(char const *pszDomain, char *pszTacsServer, int &iPortNo);
static char *TacsGetConfigFilePath(char *pszTacsFile)
{
CfgGetRootPath(pszTacsFile);
strcat(pszTacsFile, TACS_CONFIG_FILE);
return (pszTacsFile);
}
static int TacsGetServerName(char const *pszDomain, char *pszTacsServer, int &iPortNo)
{
char szTacsFile[SYS_MAX_PATH] = "";
TacsGetConfigFilePath(szTacsFile);
FILE *pTacsFile = fopen(szTacsFile, "rt");
if (pTacsFile == NULL) {
ErrSetErrorCode(ERR_TACACS_FILE_NOT_FOUND);
return (ERR_TACACS_FILE_NOT_FOUND);
}
char szTacsLine[TACS_ALIAS_LINE_MAX] = "";
while (MscGetConfigLine(szTacsLine, sizeof(szTacsLine) - 1, pTacsFile) != NULL) {
char **ppszStrings = StrGetTabLineStrings(szTacsLine);
if (ppszStrings == NULL)
continue;
int iFieldsCount = StrStringsCount(ppszStrings);
if ((iFieldsCount >= tacsMax) &&
StrIWildMatch(pszDomain, ppszStrings[tacsDomain])) {
strcpy(pszTacsServer, ppszStrings[tacsServer]);
iPortNo = atoi(ppszStrings[tacsPort]);
StrFreeStrings(ppszStrings);
fclose(pTacsFile);
return (0);
}
StrFreeStrings(ppszStrings);
}
fclose(pTacsFile);
ErrSetErrorCode(ERR_TACACS_SERVER_NOT_FOUND);
return (ERR_TACACS_SERVER_NOT_FOUND);
}
int TacsAuthenticate(char const *pszDomain, char const *pszUsername,
char const *pszPassword, int iServicePort)
{
///////////////////////////////////////////////////////////////////////////////
// Get TACACS server coordinates
///////////////////////////////////////////////////////////////////////////////
int iPortNo = TACACS_PORT;
char szTacsServer[MAX_HOST_NAME] = "";
if (TacsGetServerName(pszDomain, szTacsServer, iPortNo) < 0)
return (ErrGetErrorCode());
///////////////////////////////////////////////////////////////////////////////
// If not specified use POP3 port ( TACACS_DPORT )
///////////////////////////////////////////////////////////////////////////////
if (iServicePort < 0)
iServicePort = TACACS_DPORT;
///////////////////////////////////////////////////////////////////////////////
// Open TACACS server socket
///////////////////////////////////////////////////////////////////////////////
SYS_SOCKET SockFD;
SYS_INET_ADDR SvrAddr;
SYS_INET_ADDR SockAddr;
if (MscCreateClientSocket(szTacsServer, iPortNo, SOCK_DGRAM, &SockFD, &SvrAddr,
&SockAddr, TACACS_TIMEOUT) < 0)
return (ErrGetErrorCode());
///////////////////////////////////////////////////////////////////////////////
// Build TACACS request packet
///////////////////////////////////////////////////////////////////////////////
char szBuffer[1024] = "";
xtacacstype *pTacs = (xtacacstype *) szBuffer;
ZeroData(szBuffer);
pTacs->type = XTA_LOGIN;
pTacs->version = XTA_VERSION;
pTacs->trans = htons((unsigned short) SysGetCurrentThreadId());
pTacs->reason = XTA_A_NONE;
pTacs->dhost = (SYS_UINT32) SysGetAddrAddress(SockAddr);
pTacs->dport = htons((unsigned short) iServicePort);
pTacs->lport = htons(TACACS_LPORT);
pTacs->namelen = (SYS_UINT8) strlen(pszUsername);
pTacs->pwlen = (SYS_UINT8) strlen(pszPassword);
int iQueryLenght = XTACACSSIZE + pTacs->namelen + pTacs->pwlen;
memcpy(&szBuffer[XTACACSSIZE], pszUsername, pTacs->namelen);
memcpy(&szBuffer[XTACACSSIZE + pTacs->namelen], pszPassword, pTacs->pwlen);
for (int iSendLoops = 0; iSendLoops < TACACS_SEND_RETRIES; iSendLoops++) {
///////////////////////////////////////////////////////////////////////////////
// Send packet
///////////////////////////////////////////////////////////////////////////////
if (SysSendDataTo(SockFD, (const struct sockaddr *) &SvrAddr, sizeof(SvrAddr),
szBuffer, iQueryLenght, TACACS_TIMEOUT) != iQueryLenght)
continue;
///////////////////////////////////////////////////////////////////////////////
// Receive packet lenght
///////////////////////////////////////////////////////////////////////////////
SYS_INET_ADDR RecvAddr;
SYS_UINT8 RespBuffer[1024];
ZeroData(RecvAddr);
ZeroData(RespBuffer);
int iPacketLenght =
SysRecvDataFrom(SockFD, (struct sockaddr *) &RecvAddr, sizeof(RecvAddr),
(char *) RespBuffer, sizeof(RespBuffer), TACACS_TIMEOUT);
if (iPacketLenght < XTACACSSIZE)
continue;
xtacacstype *pRespTacs = (xtacacstype *) RespBuffer;
if (pRespTacs->response != 1) {
SysCloseSocket(SockFD);
ErrSetErrorCode(ERR_TACACS_AUTH_FAILED);
return (ERR_TACACS_AUTH_FAILED);
}
SysCloseSocket(SockFD);
return (0);
}
SysCloseSocket(SockFD);
ErrSetErrorCode(ERR_TACACS_AUTH_UNAVAILABLE);
return (ERR_TACACS_AUTH_UNAVAILABLE);
}
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