/*
EHLO foo
250-spamfirewall.domain.com
250-PIPELINING
250-SIZE 100000000
250-VRFY
250-ETRN
250 8BITMIME
*/
int sayEHLO(int hSocket, _MODULE_DATA* _psSessionData)
{
unsigned char bufSend[BUF_SIZE];
unsigned char* bufReceive;
int nReceiveBufferSize = 0;
/* send helo string */
memset(bufSend, 0, sizeof(bufSend));
sprintf(bufSend, "EHLO %.250s\r\n", _psSessionData->szEHLO);
if (medusaSend(hSocket, bufSend, strlen(bufSend), 0) < 0)
{
writeError(ERR_ERROR, "%s failed: medusaSend was not successful", MODULE_NAME);
}
nReceiveBufferSize = 0;
bufReceive = medusaReceiveLineDelay(hSocket, &nReceiveBufferSize, RECEIVE_DELAY_1, RECEIVE_DELAY_2);
if (bufReceive == NULL)
{
writeError(ERR_ERROR, "%s failed: medusaReceive returned no data.", MODULE_NAME);
return FAILURE;
}
/* check if more data is waiting */
if (medusaDataReadyTimed(hSocket, 0, 20000) > 0)
bufReceive = medusaReceiveLineDelay(hSocket, &nReceiveBufferSize, RECEIVE_DELAY_1, RECEIVE_DELAY_2);
writeError(ERR_DEBUG_MODULE, "[%s] Server responded to ELHO with: %s", MODULE_NAME, bufReceive);
free(bufReceive);
return SUCCESS;
}
/* VRFY [email protected] 252 [email protected] VRFY [email protected] 550 <*****@*****.**>: Recipient address rejected: No such user ([email protected]) VRFY [email protected] 554 <*****@*****.**>: Relay access denied 421 Error: too many errors */ int tryLogin(int hSocket, sLogin** psLogin, _MODULE_DATA* _psSessionData, char* szDomain, char* szAccount) { int iRet; unsigned char bufSend[BUF_SIZE]; unsigned char* bufReceive; int nReceiveBufferSize = 0; /* send helo string */ writeError(ERR_DEBUG_MODULE, "[%s] Sending: VRFY %.250s@%.250s\r\n", MODULE_NAME, szAccount, szDomain); memset(bufSend, 0, sizeof(bufSend)); sprintf(bufSend, "VRFY %.250s@%.250s\r\n", szAccount, szDomain); if (medusaSend(hSocket, bufSend, strlen(bufSend), 0) < 0) { writeError(ERR_ERROR, "%s failed: medusaSend was not successful", MODULE_NAME); } nReceiveBufferSize = 0; bufReceive = medusaReceiveLineDelay(hSocket, &nReceiveBufferSize, RECEIVE_DELAY_1, RECEIVE_DELAY_2); if (bufReceive == NULL) { writeError(ERR_ERROR, "%s failed: medusaReceive returned no data.", MODULE_NAME); return FAILURE; } else if (strncmp(bufReceive, "252 ", 4) == 0) /* valid account */ { writeError(ERR_DEBUG_MODULE, "[%s] Found valid account: %s", MODULE_NAME, szAccount); (*psLogin)->iResult = LOGIN_RESULT_SUCCESS; iRet = MSTATE_RUNNING; } else if (strncmp(bufReceive, "550 ", 4) == 0) /* non-existant account */ { writeError(ERR_DEBUG_MODULE, "[%s] Non-existant account: %s", MODULE_NAME, szAccount); (*psLogin)->iResult = LOGIN_RESULT_FAIL; iRet = MSTATE_RUNNING; } else if (strncmp(bufReceive, "554 ", 4) == 0) /* invalid domain name */ { writeError(ERR_ERROR, "[%s] Invalid domain name: %s", MODULE_NAME, szDomain); (*psLogin)->iResult = LOGIN_RESULT_ERROR; iRet = MSTATE_EXITING; } /* check if more data is waiting */ if (medusaDataReadyTimed(hSocket, 0, 20000) > 0) bufReceive = medusaReceiveLineDelay(hSocket, &nReceiveBufferSize, RECEIVE_DELAY_1, RECEIVE_DELAY_2); if (strstr(bufReceive, "421 Error: too many errors")) { writeError(ERR_DEBUG_MODULE, "[%s] Too many errors. Restarting connection.", MODULE_NAME); iRet = MSTATE_NEW; } setPassResult((*psLogin), szDomain); return(iRet); }
int initModule(sLogin* _psLogin, _MODULE_DATA *_psSessionData)
{
int hSocket = -1;
enum MODULE_STATE nState = MSTATE_NEW;
char* bufReceive;
int nReceiveBufferSize = 0, nFoundPrompt = PROMPT_UNKNOWN;
int i = 0;
sCredentialSet *psCredSet = NULL;
sConnectParams params;
psCredSet = malloc( sizeof(sCredentialSet) );
memset(psCredSet, 0, sizeof(sCredentialSet));
if (getNextCredSet(_psLogin, psCredSet) == FAILURE)
{
writeError(ERR_ERROR, "[%s] Error retrieving next credential set to test.", MODULE_NAME);
nState = MSTATE_COMPLETE;
}
else if (psCredSet->psUser)
{
writeError(ERR_DEBUG_MODULE, "[%s] module started for host: %s user: %s", MODULE_NAME, _psLogin->psServer->pHostIP, psCredSet->psUser->pUser);
}
else
{
writeError(ERR_DEBUG_MODULE, "[%s] module started for host: %s - no more available users to test.", MODULE_NAME);
nState = MSTATE_COMPLETE;
}
memset(¶ms, 0, sizeof(sConnectParams));
if (_psLogin->psServer->psAudit->iPortOverride > 0)
params.nPort = _psLogin->psServer->psAudit->iPortOverride;
else if (_psLogin->psServer->psHost->iUseSSL > 0)
params.nPort = PORT_TELNETS;
else
params.nPort = PORT_TELNET;
initConnectionParams(_psLogin, ¶ms);
while (nState != MSTATE_COMPLETE)
{
switch (nState)
{
case MSTATE_NEW:
// Already have an open socket - close it
if (hSocket > 0)
medusaDisconnect(hSocket);
if (_psLogin->psServer->psHost->iUseSSL > 0)
hSocket = medusaConnectSSL(¶ms);
else
hSocket = medusaConnect(¶ms);
if (hSocket <= 0)
{
writeError(ERR_ERROR, "[%s] Failed to connect, port %d was not open on %s", MODULE_NAME, params.nPort, _psLogin->psServer->pHostIP);
_psLogin->iResult = LOGIN_RESULT_UNKNOWN;
setPassResult(_psLogin, psCredSet->pPass);
return FAILURE;
}
writeError(ERR_DEBUG_MODULE, "Connected");
// Examine the first line returned
nReceiveBufferSize = 0;
bufReceive = medusaReceiveLineDelay(hSocket, &nReceiveBufferSize, RECEIVE_DELAY_1, RECEIVE_DELAY_2);
if (bufReceive == NULL)
return FAILURE;
bufReceive[nReceiveBufferSize] = 0; // Make certain buffer is null-terminated
if (bufReceive == NULL)
{
writeError(ERR_ERROR, "[%s] null response was unexpected from a telnet server (is one running?)", MODULE_NAME);
_psLogin->iResult = LOGIN_RESULT_UNKNOWN;
setPassResult(_psLogin, psCredSet->pPass);
return FAILURE;
}
// Telnet protocol negotiation
do
{
nFoundPrompt = PROMPT_UNKNOWN;
processIAC(hSocket, _psSessionData, &bufReceive, &nReceiveBufferSize);
if (bufReceive != NULL && bufReceive[0] != 0 && (unsigned char)bufReceive[0] != IAC)
makeToLower(bufReceive);
if (bufReceive != NULL)
{
writeError(ERR_DEBUG_MODULE, "Looking for login prompts");
if (_psSessionData->nMode == MODE_AS400)
{
if (strcasestr(bufReceive, (char *)"Sign On") != '\0')
{
writeError(ERR_INFO, "[%s] Detected AS/400 Sign On Screen.", MODULE_NAME);
nFoundPrompt = PROMPT_LOGIN_PASSWORD;
FREE(bufReceive);
if (medusaDataReadyTimed(hSocket, 0, 20000) > 0)
{
// More data waiting
bufReceive = medusaReceiveLineDelay(hSocket, &nReceiveBufferSize, RECEIVE_DELAY_1, RECEIVE_DELAY_2);
if (bufReceive != NULL)
bufReceive[nReceiveBufferSize] = 0; // Make certain buffer is null-terminated
}
break;
}
/*
Sign On
System . . . . . : TSTDBS16
Subsystem . . . . : QINTER
Display . . . . . : QPADEV0001
*/
}
else
{
// Look for known login prompts
for (i = 0; i < KNOWN_LOGIN_SIZE; i++)
{
if (strcasestr(bufReceive, KNOWN_LOGIN_PROMPTS[i]) != '\0')
{
// Do we have a prompt?
writeError(ERR_DEBUG_MODULE, "Found login prompt...");
nFoundPrompt = PROMPT_LOGIN_PASSWORD;
break;
}
}
/* Some systems do not provide a login prompt and go right to password */
for (i = 0; i < KNOWN_PWD_SIZE; i++)
{
if (strcasestr(bufReceive, KNOWN_PWD_PROMPTS[i]) != '\0')
{
// Do we have a prompt?
writeError(ERR_DEBUG_MODULE, "Found a password prompt already...");
nFoundPrompt = PROMPT_PASSWORD;
if (_psLogin->psServer->iLoginsDone < 1 && _psLogin->iId == 0)
writeVerbose(VB_NONE_FILE, "Password Prompt Only: %s\n", _psLogin->psServer->pHostIP);
break;
}
}
if (nFoundPrompt == PROMPT_UNKNOWN)
{
FREE(bufReceive);
if (medusaDataReadyTimed(hSocket, 0, 20000) > 0)
{
// More data waiting
bufReceive = medusaReceiveLineDelay(hSocket, &nReceiveBufferSize, RECEIVE_DELAY_1, RECEIVE_DELAY_2);
if (bufReceive != NULL)
bufReceive[nReceiveBufferSize] = 0; // Make certain buffer is null-terminated
}
}
}
}
}
while (bufReceive != NULL && (unsigned char)bufReceive[0] == IAC && nFoundPrompt == PROMPT_UNKNOWN);
FREE(bufReceive);
if (nFoundPrompt == PROMPT_UNKNOWN)
{
writeError(ERR_ERROR, "[%s] Failed to identify logon prompt.", MODULE_NAME);
_psLogin->iResult = LOGIN_RESULT_UNKNOWN;
setPassResult(_psLogin, psCredSet->pPass);
return FAILURE;
}
else
nState = MSTATE_RUNNING;
break;
case MSTATE_RUNNING:
if (_psSessionData->nMode == MODE_AS400)
nState = tryLoginAS400(hSocket, &_psLogin, _psSessionData, psCredSet->psUser->pUser, psCredSet->pPass);
else
nState = tryLogin(hSocket, &_psLogin, _psSessionData, psCredSet->psUser->pUser, psCredSet->pPass, nFoundPrompt);
if (nState != MSTATE_EXITING)
{
if (processIAClogout(hSocket, _psSessionData) == FAILURE)
{
writeError(ERR_ERROR, "[%s] Failed to close existing Telnet session.", MODULE_NAME);
}
medusaDisconnect(hSocket);
hSocket = -1;
/*
Cisco devices appear to keep sessions open for a brief time after we terminate
the connection. They also seem to ignore "IAC DO LOGOUT" commands. Adding a
sleep() hack here, to give them some time to clean-up.
*/
sleep(1);
if (getNextCredSet(_psLogin, psCredSet) == FAILURE)
{
writeError(ERR_ERROR, "[%s] Error retrieving next credential set to test.", MODULE_NAME);
nState = MSTATE_EXITING;
}
else
{
if (psCredSet->iStatus == CREDENTIAL_DONE)
{
writeError(ERR_DEBUG_MODULE, "[%s] No more available credential sets to test.", MODULE_NAME);
nState = MSTATE_EXITING;
}
else if (psCredSet->iStatus == CREDENTIAL_NEW_USER)
{
writeError(ERR_DEBUG_MODULE, "[%s] Starting testing for new user: %s.", MODULE_NAME, psCredSet->psUser->pUser);
nState = MSTATE_NEW;
}
else
writeError(ERR_DEBUG_MODULE, "[%s] Next credential set - user: %s password: %s", MODULE_NAME, psCredSet->psUser->pUser, psCredSet->pPass);
}
}
break;
case MSTATE_EXITING:
if (hSocket > 0)
medusaDisconnect(hSocket);
hSocket = -1;
nState = MSTATE_COMPLETE;
break;
default:
writeError(ERR_CRITICAL, "Unknown %s module (%d) state %d host: %s", MODULE_NAME, _psLogin->iId, nState, _psLogin->psServer->pHostIP);
_psLogin->iResult = LOGIN_RESULT_UNKNOWN;
}
}
FREE(psCredSet);
return SUCCESS;
}
