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POP3Svr.cpp
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POP3Svr.cpp
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/*
* XMail by Davide Libenzi (Intranet and Internet mail server)
* Copyright (C) 1999,..,2010 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 <[email protected]>
*
*/
#include "SysInclude.h"
#include "SysDep.h"
#include "SvrDefines.h"
#include "ShBlocks.h"
#include "SList.h"
#include "BuffSock.h"
#include "SSLBind.h"
#include "ResLocks.h"
#include "MiscUtils.h"
#include "StrUtils.h"
#include "MD5.h"
#include "SSLConfig.h"
#include "SvrUtils.h"
#include "UsrUtils.h"
#include "UsrAuth.h"
#include "POP3Svr.h"
#include "POP3Utils.h"
#include "MessQueue.h"
#include "MailDomains.h"
#include "MailConfig.h"
#include "AppDefines.h"
#include "MailSvr.h"
#define STD_POP3_TIMEOUT 30000
#define POP3_IPMAP_FILE "pop3.ipmap.tab"
#define POP3_LOG_FILE "pop3"
enum POP3States {
stateInit,
stateUser,
stateLogged,
stateExit
};
struct POP3Session {
int iPOP3State;
ThreadConfig const *pThCfg;
POP3Config *pPOP3Cfg;
SVRCFG_HANDLE hSvrConfig;
int iBadLoginWait;
SYS_INET_ADDR PeerInfo;
char szSvrFQDN[MAX_HOST_NAME];
char szSvrDomain[MAX_HOST_NAME];
char szUser[MAX_ADDR_NAME];
char szPassword[256];
POP3_HANDLE hPOPSession;
char szTimeStamp[256];
int iLogPasswd;
};
static int POP3ThreadCountAdd(long lCount, SHB_HANDLE hShbPOP3,
POP3Config *pPOP3Cfg = NULL);
static int POP3LogEnabled(SHB_HANDLE hShbPOP3, POP3Config *pPOP3Cfg = NULL);
static POP3Config *POP3GetConfigCopy(SHB_HANDLE hShbPOP3)
{
POP3Config *pPOP3Cfg = (POP3Config *) ShbLock(hShbPOP3);
if (pPOP3Cfg == NULL)
return NULL;
POP3Config *pPOP3CfgCopy = (POP3Config *) SysAlloc(sizeof(POP3Config));
if (pPOP3CfgCopy != NULL)
memcpy(pPOP3CfgCopy, pPOP3Cfg, sizeof(POP3Config));
ShbUnlock(hShbPOP3);
return pPOP3CfgCopy;
}
static int POP3ThreadCountAdd(long lCount, SHB_HANDLE hShbPOP3, POP3Config *pPOP3Cfg)
{
int iDoUnlock = 0;
if (pPOP3Cfg == NULL) {
if ((pPOP3Cfg = (POP3Config *) ShbLock(hShbPOP3)) == NULL)
return ErrGetErrorCode();
++iDoUnlock;
}
if ((pPOP3Cfg->lThreadCount + lCount) > pPOP3Cfg->lMaxThreads) {
if (iDoUnlock)
ShbUnlock(hShbPOP3);
ErrSetErrorCode(ERR_SERVER_BUSY);
return ERR_SERVER_BUSY;
}
pPOP3Cfg->lThreadCount += lCount;
if (iDoUnlock)
ShbUnlock(hShbPOP3);
return 0;
}
static int POP3LogEnabled(SHB_HANDLE hShbPOP3, POP3Config *pPOP3Cfg)
{
int iDoUnlock = 0;
if (pPOP3Cfg == NULL) {
if ((pPOP3Cfg = (POP3Config *) ShbLock(hShbPOP3)) == NULL)
return ErrGetErrorCode();
++iDoUnlock;
}
unsigned long ulFlags = pPOP3Cfg->ulFlags;
if (iDoUnlock)
ShbUnlock(hShbPOP3);
return (ulFlags & POP3F_LOG_ENABLED) ? 1: 0;
}
static int POP3CheckPeerIP(SYS_SOCKET SockFD)
{
char szIPMapFile[SYS_MAX_PATH] = "";
CfgGetRootPath(szIPMapFile, sizeof(szIPMapFile));
StrNCat(szIPMapFile, POP3_IPMAP_FILE, sizeof(szIPMapFile));
SysLogMessage(LOG_LEV_DEBUG, "Going to look at config file: '%s'\n", szIPMapFile);
if (SysExistFile(szIPMapFile)) {
SYS_INET_ADDR PeerInfo;
ZeroData(PeerInfo); /* [i_a] */
if (SysGetPeerInfo(SockFD, PeerInfo) < 0 ||
MscCheckAllowedIP(szIPMapFile, PeerInfo, true) < 0)
return ErrGetErrorCode();
}
return 0;
}
static int POP3CheckSysResources(SVRCFG_HANDLE hSvrConfig)
{
/* Check virtual memory */
int iMinValue = SvrGetConfigInt("Pop3MinVirtMemSpace", -1, hSvrConfig);
if (iMinValue > 0 && SvrCheckVirtMemSpace(1024 * (unsigned long) iMinValue) < 0)
return ErrGetErrorCode();
return 0;
}
static int POP3InitSession(ThreadConfig const *pThCfg, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
ZeroData(POP3S);
POP3S.iPOP3State = stateInit;
POP3S.pThCfg = pThCfg;
POP3S.hSvrConfig = INVALID_SVRCFG_HANDLE;
POP3S.pPOP3Cfg = NULL;
POP3S.hPOPSession = INVALID_POP3_HANDLE;
if ((POP3S.hSvrConfig = SvrGetConfigHandle()) == INVALID_SVRCFG_HANDLE)
return ErrGetErrorCode();
if (POP3CheckSysResources(POP3S.hSvrConfig) < 0 ||
SysGetPeerInfo(BSckGetAttachedSocket(hBSock), POP3S.PeerInfo) < 0) {
SvrReleaseConfigHandle(POP3S.hSvrConfig);
return ErrGetErrorCode();
}
/* Get connection socket host name */
char szIP[128] = "???.???.???.???";
if (MscGetSockHost(BSckGetAttachedSocket(hBSock), POP3S.szSvrFQDN,
sizeof(POP3S.szSvrFQDN)) < 0)
StrSNCpy(POP3S.szSvrFQDN, SysInetNToA(POP3S.PeerInfo, szIP, sizeof(szIP)));
else {
/* Try to get a valid domain from the FQDN */
if (MDomGetClientDomain(POP3S.szSvrFQDN, POP3S.szSvrDomain,
sizeof(POP3S.szSvrDomain) - 1) < 0)
StrSNCpy(POP3S.szSvrDomain, POP3S.szSvrFQDN);
}
/*
* If "POP3Domain" is defined, it's taken as default POP3 domain that means
* that users of such domain can log using only the name part of their email
* address.
*/
char *pszDefDomain = SvrGetConfigVar(POP3S.hSvrConfig, "POP3Domain");
if (pszDefDomain != NULL) {
StrSNCpy(POP3S.szSvrDomain, pszDefDomain);
SysFree(pszDefDomain);
}
/* As a last tentative We try to get "RootDomain" to set POP3 domain */
if (IsEmptyString(POP3S.szSvrDomain)) {
char *pszRootDomain = SvrGetConfigVar(POP3S.hSvrConfig, "RootDomain");
if (pszRootDomain == NULL) {
SvrReleaseConfigHandle(POP3S.hSvrConfig);
ErrSetErrorCode(ERR_NO_DOMAIN);
return ERR_NO_DOMAIN;
}
StrSNCpy(POP3S.szSvrDomain, pszRootDomain);
SysFree(pszRootDomain);
}
if ((POP3S.pPOP3Cfg = POP3GetConfigCopy(POP3S.pThCfg->hThShb)) == NULL) {
SvrReleaseConfigHandle(POP3S.hSvrConfig);
return ErrGetErrorCode();
}
POP3S.iBadLoginWait = POP3S.pPOP3Cfg->iBadLoginWait;
POP3S.iLogPasswd = SvrGetConfigInt("Pop3LogPasswd", 0, POP3S.hSvrConfig);
/* Create timestamp for APOP command */
sprintf(POP3S.szTimeStamp, "<%lu.%lu@%s>",
(unsigned long) time(NULL), SysGetCurrentThreadId(), POP3S.szSvrDomain);
return 0;
}
static int POP3LogSession(POP3Session &POP3S, char const *pszStatus,
char const *pszFmt, ...)
{
char *pszExtra = NULL;
char szTime[256] = "";
MscGetTimeNbrString(szTime, sizeof(szTime) - 1);
if (pszFmt != NULL)
StrVSprint(pszExtra, pszFmt, pszFmt);
RLCK_HANDLE hResLock = RLckLockEX(SVR_LOGS_DIR SYS_SLASH_STR POP3_LOG_FILE);
if (hResLock == INVALID_RLCK_HANDLE)
return ErrGetErrorCode();
char const *pszPassword = (POP3S.iLogPasswd == 2 || (POP3S.iLogPasswd == 1 &&
POP3S.iPOP3State != stateLogged)) ?
POP3S.szPassword: "";
char szIP[128] = "???.???.???.???";
MscFileLog(POP3_LOG_FILE, "\"%s\""
"\t\"%s\""
"\t\"%s\""
"\t\"%s\""
"\t\"%s\""
"\t\"%s\""
"\t\"%s\""
"%s"
"\n", POP3S.szSvrFQDN, POP3S.szSvrDomain,
SysInetNToA(POP3S.PeerInfo, szIP, sizeof(szIP)), szTime, POP3S.szUser,
pszPassword, pszStatus, pszExtra != NULL ? pszExtra: "");
RLckUnlockEX(hResLock);
SysFree(pszExtra);
return 0;
}
static void POP3ClearSession(POP3Session &POP3S)
{
if (POP3S.hPOPSession != INVALID_POP3_HANDLE) {
UPopReleaseSession(POP3S.hPOPSession, (POP3S.iPOP3State == stateExit) ? 1: 0);
POP3S.hPOPSession = INVALID_POP3_HANDLE;
}
if (POP3S.hSvrConfig != INVALID_SVRCFG_HANDLE) {
SvrReleaseConfigHandle(POP3S.hSvrConfig);
POP3S.hSvrConfig = INVALID_SVRCFG_HANDLE;
}
SysFreeNullify(POP3S.pPOP3Cfg);
}
static int POP3HandleCmd_USER(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateInit) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
char **ppszTokens = StrTokenize(pszCommand, " ");
if (ppszTokens == NULL || StrStringsCount(ppszTokens) != 2) {
if (ppszTokens != NULL)
StrFreeStrings(ppszTokens);
POP3S.iPOP3State = stateInit;
BSckSendString(hBSock, "-ERR Invalid syntax", POP3S.pPOP3Cfg->iTimeout);
return -1;
}
char szAccountUser[MAX_ADDR_NAME] = "";
char szAccountDomain[MAX_HOST_NAME] = "";
if (StrSplitString(ppszTokens[1], POP3_USER_SPLITTERS, szAccountUser,
sizeof(szAccountUser), szAccountDomain,
sizeof(szAccountDomain)) < 0) {
StrFreeStrings(ppszTokens);
BSckSendString(hBSock, "-ERR Invalid username", POP3S.pPOP3Cfg->iTimeout);
return -1;
}
StrFreeStrings(ppszTokens);
StrSNCpy(POP3S.szUser, szAccountUser);
if (strlen(szAccountDomain) > 0)
StrSNCpy(POP3S.szSvrDomain, szAccountDomain);
POP3S.iPOP3State = stateUser;
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK Password required for %s@%s", POP3S.szUser, POP3S.szSvrDomain);
return 0;
}
static int POP3HandleBadLogin(BSOCK_HANDLE hBSock, POP3Session &POP3S)
{
/* Log POP3 session */
if (POP3LogEnabled(POP3S.pThCfg->hThShb, POP3S.pPOP3Cfg))
POP3LogSession(POP3S, "ELOGIN", NULL);
if (POP3S.pPOP3Cfg->ulFlags & POP3F_HANG_ON_BADLOGIN) {
/* Exit if POP3F_HANG_ON_BADLOGIN is set */
POP3S.iPOP3State = stateExit;
} else {
/* Otherwise sleep and doubles the sleeptime */
SysSleep(POP3S.iBadLoginWait);
POP3S.iBadLoginWait += POP3S.iBadLoginWait;
POP3S.iPOP3State = stateInit;
}
BSckSendString(hBSock, "-ERR Invalid auth or access denied",
POP3S.pPOP3Cfg->iTimeout);
return 0;
}
static int POP3HandleCmd_PASS(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateUser) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
char **ppszTokens = StrTokenize(pszCommand, " ");
if (ppszTokens == NULL || StrStringsCount(ppszTokens) != 2) {
if (ppszTokens != NULL)
StrFreeStrings(ppszTokens);
POP3S.iPOP3State = stateInit;
BSckSendString(hBSock, "-ERR Invalid syntax", POP3S.pPOP3Cfg->iTimeout);
return -1;
}
StrSNCpy(POP3S.szPassword, ppszTokens[1]);
StrFreeStrings(ppszTokens);
/* Check the presence of external authentication modules. If authentication
* succeed "pszPassword" is set to NULL that instruct "UPopBuildSession"
* to not make local authentication.
*/
char const *pszPassword = POP3S.szPassword;
int iAuthResult = UAthAuthenticateUser(AUTH_SERVICE_POP3, POP3S.szSvrDomain,
POP3S.szUser, POP3S.szPassword);
if (iAuthResult < 0) {
if (iAuthResult != ERR_NO_EXTERNAL_AUTH_DEFINED) {
ErrorPush();
POP3HandleBadLogin(hBSock, POP3S);
return ErrorPop();
}
} else
pszPassword = NULL;
/* Create POP3 session */
if ((POP3S.hPOPSession = UPopBuildSession(POP3S.szSvrDomain, POP3S.szUser,
pszPassword,
&POP3S.PeerInfo)) == INVALID_POP3_HANDLE) {
ErrorPush();
POP3HandleBadLogin(hBSock, POP3S);
return ErrorPop();
}
/* Save the user connection IP to use for SMTP authentication */
UPopSaveUserIP(POP3S.hPOPSession);
POP3S.iPOP3State = stateLogged;
int iMsgCount = UPopGetSessionMsgCurrent(POP3S.hPOPSession);
SYS_OFF_T llMBSize = UPopGetSessionMBSize(POP3S.hPOPSession);
/* Log POP3 session */
if (POP3LogEnabled(POP3S.pThCfg->hThShb, POP3S.pPOP3Cfg))
POP3LogSession(POP3S, "LOGIN",
"\t\"%d\""
"\t\"" SYS_OFFT_FMT "\"", iMsgCount, llMBSize);
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK Maildrop has %d messages (" SYS_OFFT_FMT " bytes)",
iMsgCount, llMBSize);
return 0;
}
static int POP3HandleCmd_APOP(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateInit) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
char **ppszTokens = StrTokenize(pszCommand, " ");
if (ppszTokens == NULL || StrStringsCount(ppszTokens) != 3) {
if (ppszTokens != NULL)
StrFreeStrings(ppszTokens);
POP3S.iPOP3State = stateInit;
BSckSendString(hBSock, "-ERR Invalid syntax", POP3S.pPOP3Cfg->iTimeout);
return -1;
}
/* Process parameters */
char szAccountUser[MAX_ADDR_NAME] = "";
char szAccountDomain[MAX_HOST_NAME] = "";
if (StrSplitString(ppszTokens[1], POP3_USER_SPLITTERS, szAccountUser,
sizeof(szAccountUser), szAccountDomain,
sizeof(szAccountDomain)) < 0) {
StrFreeStrings(ppszTokens);
BSckSendString(hBSock, "-ERR Invalid username", POP3S.pPOP3Cfg->iTimeout);
return -1;
}
StrSNCpy(POP3S.szUser, szAccountUser);
StrSNCpy(POP3S.szPassword, ppszTokens[2]);
if (strlen(szAccountDomain) > 0)
StrSNCpy(POP3S.szSvrDomain, szAccountDomain);
StrFreeStrings(ppszTokens);
/* Check the presence of external authentication modules. If authentication */
/* succeed "pszPassword" is set to NULL that instruct "UPopBuildSession" */
/* to not make local authentication */
char const *pszPassword = POP3S.szPassword;
int iAuthResult = UAthAuthenticateUser(AUTH_SERVICE_POP3,
POP3S.szSvrDomain, POP3S.szUser, POP3S.szPassword);
if (iAuthResult < 0) {
if (iAuthResult != ERR_NO_EXTERNAL_AUTH_DEFINED) {
ErrorPush();
POP3HandleBadLogin(hBSock, POP3S);
return ErrorPop();
}
} else
pszPassword = NULL;
/* Do APOP authentication ( only if the external one is not performed ) */
if (pszPassword != NULL &&
UPopAuthenticateAPOP(POP3S.szSvrDomain, POP3S.szUser, POP3S.szTimeStamp,
pszPassword) < 0) {
ErrorPush();
POP3HandleBadLogin(hBSock, POP3S);
return ErrorPop();
}
/* Create POP3 session ( the NULL as third parameter force to not perform */
/* user authentication that has been done before ) */
if ((POP3S.hPOPSession = UPopBuildSession(POP3S.szSvrDomain, POP3S.szUser,
NULL, &POP3S.PeerInfo)) == INVALID_POP3_HANDLE)
{
ErrorPush();
POP3HandleBadLogin(hBSock, POP3S);
return ErrorPop();
}
/* Save the user connection IP to use for SMTP authentication */
UPopSaveUserIP(POP3S.hPOPSession);
POP3S.iPOP3State = stateLogged;
int iMsgCount = UPopGetSessionMsgCurrent(POP3S.hPOPSession);
SYS_OFF_T llMBSize = UPopGetSessionMBSize(POP3S.hPOPSession);
/* Log POP3 session */
if (POP3LogEnabled(POP3S.pThCfg->hThShb, POP3S.pPOP3Cfg))
POP3LogSession(POP3S, "LOGIN",
"\t\"%d\""
"\t\"" SYS_OFFT_FMT "\"", iMsgCount, llMBSize);
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK Maildrop has %d messages (" SYS_OFFT_FMT " bytes)",
iMsgCount, llMBSize);
return 0;
}
static int POP3HandleCmd_CAPA(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
char const *pszSTLS = "";
if (SvrTestConfigFlag("EnablePOP3-TLS", true, POP3S.hSvrConfig) &&
strcmp(BSckBioName(hBSock), BSSL_BIO_NAME) != 0)
pszSTLS = "STLS\r\n";
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK Capability list follows\r\n"
"TOP\r\n"
"USER\r\n"
"UIDL\r\n"
"PIPELINING\r\n"
"%s"
"IMPLEMENTATION " POP3_SERVER_NAME "\r\n"
".", pszSTLS);
return 0;
}
static int POP3SslEnvCB(void *pPrivate, int iID, void const *pData)
{
POP3Session *pPOP3S = (POP3Session *) pPrivate;
/*
* Empty for now ...
*/
return 0;
}
static int POP3HandleCmd_STLS(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateInit) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
if (strcmp(BSckBioName(hBSock), BSSL_BIO_NAME) == 0) {
/*
* Client is trying to run another STLS after a successful one.
* Not possible ...
*/
BSckSendString(hBSock, "-ERR Command not permitted when TLS active",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
if (!SvrTestConfigFlag("EnablePOP3-TLS", true, POP3S.hSvrConfig)) {
BSckSendString(hBSock, "-ERR Command disabled", POP3S.pPOP3Cfg->iTimeout);
ErrSetErrorCode(ERR_SSL_DISABLED);
return ERR_SSL_DISABLED;
}
int iError;
SslServerBind SSLB;
if (CSslBindSetup(&SSLB) < 0) {
BSckSendString(hBSock, "-ERR Server TLS setup error",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
BSckSendString(hBSock, "+OK Begin TLS negotiation", POP3S.pPOP3Cfg->iTimeout);
iError = BSslBindServer(hBSock, &SSLB, POP3SslEnvCB, &POP3S);
CSslBindCleanup(&SSLB);
if (iError < 0) {
char szIP[128] = "";
SysLogMessage(LOG_LEV_MESSAGE, "POP3 failed to STLS [%s]\n",
SysInetNToA(POP3S.PeerInfo, szIP, sizeof(szIP)));
/*
* We have no other option than exit here ...
*/
POP3S.iPOP3State = stateExit;
return iError;
}
return 0;
}
static int POP3HandleCmd_STAT(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateLogged) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
int iMsgCount = UPopGetSessionMsgCurrent(POP3S.hPOPSession);
SYS_OFF_T llMBSize = UPopGetSessionMBSize(POP3S.hPOPSession);
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout, "+OK %d " SYS_OFFT_FMT,
iMsgCount, llMBSize);
return 0;
}
static int POP3HandleCmd_LIST(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateLogged) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
int iMsgIndex = -1;
int iNumArgs = sscanf(pszCommand, "%*s %d", &iMsgIndex);
if (iNumArgs < 1) {
int iMsgCount = UPopGetSessionMsgCurrent(POP3S.hPOPSession);
int iMsgTotal = UPopGetSessionMsgTotal(POP3S.hPOPSession);
SYS_OFF_T llMBSize = UPopGetSessionMBSize(POP3S.hPOPSession);
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK %d " SYS_OFFT_FMT, iMsgCount, llMBSize);
for (int i = 0; i < iMsgTotal; i++) {
SYS_OFF_T llMessageSize = 0;
if (UPopGetMessageSize(POP3S.hPOPSession, i + 1,
llMessageSize) == 0)
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"%d " SYS_OFFT_FMT, i + 1,
llMessageSize);
}
BSckSendString(hBSock, ".", POP3S.pPOP3Cfg->iTimeout);
} else {
SYS_OFF_T llMessageSize = 0;
if (UPopGetMessageSize(POP3S.hPOPSession, iMsgIndex,
llMessageSize) < 0)
BSckSendString(hBSock, "-ERR No such message",
POP3S.pPOP3Cfg->iTimeout);
else
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK %d " SYS_OFFT_FMT, iMsgIndex,
llMessageSize);
}
return 0;
}
static int POP3HandleCmd_UIDL(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateLogged) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
int iMsgIndex = -1;
int iNumArgs = sscanf(pszCommand, "%*s %d", &iMsgIndex);
char szMessageUIDL[256];
if (iNumArgs < 1) {
int iMsgCount = UPopGetSessionMsgCurrent(POP3S.hPOPSession);
int iMsgTotal = UPopGetSessionMsgTotal(POP3S.hPOPSession);
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout, "+OK %d", iMsgCount);
for (int i = 0; i < iMsgTotal; i++) {
if (UPopGetMessageUIDL(POP3S.hPOPSession, i + 1, szMessageUIDL,
sizeof(szMessageUIDL)) == 0) {
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"%d %s", i + 1, szMessageUIDL);
}
}
BSckSendString(hBSock, ".", POP3S.pPOP3Cfg->iTimeout);
} else {
if (UPopGetMessageUIDL(POP3S.hPOPSession, iMsgIndex, szMessageUIDL,
sizeof(szMessageUIDL)) < 0)
BSckSendString(hBSock, "-ERR No such message",
POP3S.pPOP3Cfg->iTimeout);
else
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK %d %s", iMsgIndex, szMessageUIDL);
}
return 0;
}
static int POP3HandleCmd_QUIT(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
POP3S.iPOP3State = stateExit;
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK %s closing session", POP3_SERVER_NAME);
return 0;
}
static int POP3HandleCmd_RETR(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateLogged) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
int iMsgIndex = -1;
if (sscanf(pszCommand, "%*s %d", &iMsgIndex) < 1) {
BSckSendString(hBSock, "-ERR Invalid syntax",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
return UPopSessionSendMsg(POP3S.hPOPSession, iMsgIndex, hBSock);
}
static int POP3HandleCmd_TOP(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateLogged) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
int iMsgIndex = -1;
int iNumLines = 0;
if (sscanf(pszCommand, "%*s %d %d", &iMsgIndex, &iNumLines) < 2) {
BSckSendString(hBSock, "-ERR Invalid syntax",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
return UPopSessionTopMsg(POP3S.hPOPSession, iMsgIndex, iNumLines, hBSock);
}
static int POP3HandleCmd_DELE(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateLogged) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
int iMsgIndex = -1;
if (sscanf(pszCommand, "%*s %d", &iMsgIndex) < 1) {
BSckSendString(hBSock, "-ERR Invalid syntax",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
if (UPopDeleteMessage(POP3S.hPOPSession, iMsgIndex) < 0) {
UPopSendErrorResponse(hBSock, ErrGetErrorCode(),
POP3S.pPOP3Cfg->iTimeout);
return ErrGetErrorCode();
}
BSckSendString(hBSock, "+OK Message deleted", POP3S.pPOP3Cfg->iTimeout);
return 0;
}
static int POP3HandleCmd_NOOP(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateLogged) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
int iMsgCount = UPopGetSessionMsgCurrent(POP3S.hPOPSession);
SYS_OFF_T llMBSize = UPopGetSessionMBSize(POP3S.hPOPSession);
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK Maildrop has %d messages (" SYS_OFFT_FMT " bytes)",
iMsgCount, llMBSize);
return 0;
}
static int POP3HandleCmd_LAST(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateLogged) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
int iMsgLast = UPopGetSessionLastAccessed(POP3S.hPOPSession);
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout, "+OK %d", iMsgLast);
return 0;
}
static int POP3HandleCmd_RSET(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
if (POP3S.iPOP3State != stateLogged) {
BSckSendString(hBSock, "-ERR Command not valid here",
POP3S.pPOP3Cfg->iTimeout);
return -1;
}
UPopResetSession(POP3S.hPOPSession);
int iMsgCount = UPopGetSessionMsgCurrent(POP3S.hPOPSession);
SYS_OFF_T llMBSize = UPopGetSessionMBSize(POP3S.hPOPSession);
BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK Maildrop has %d messages (" SYS_OFFT_FMT " bytes)",
iMsgCount, llMBSize);
return 0;
}
static int POP3HandleCommand(char const *pszCommand, BSOCK_HANDLE hBSock,
POP3Session &POP3S)
{
int iCmdResult = -1;
if (StrCmdMatch(pszCommand, "USER"))
iCmdResult = POP3HandleCmd_USER(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "PASS"))
iCmdResult = POP3HandleCmd_PASS(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "APOP"))
iCmdResult = POP3HandleCmd_APOP(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "CAPA"))
iCmdResult = POP3HandleCmd_CAPA(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "STLS"))
iCmdResult = POP3HandleCmd_STLS(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "STAT"))
iCmdResult = POP3HandleCmd_STAT(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "LIST"))
iCmdResult = POP3HandleCmd_LIST(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "UIDL"))
iCmdResult = POP3HandleCmd_UIDL(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "QUIT"))
iCmdResult = POP3HandleCmd_QUIT(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "RETR"))
iCmdResult = POP3HandleCmd_RETR(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "TOP"))
iCmdResult = POP3HandleCmd_TOP(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "DELE"))
iCmdResult = POP3HandleCmd_DELE(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "NOOP"))
iCmdResult = POP3HandleCmd_NOOP(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "LAST"))
iCmdResult = POP3HandleCmd_LAST(pszCommand, hBSock, POP3S);
else if (StrCmdMatch(pszCommand, "RSET"))
iCmdResult = POP3HandleCmd_RSET(pszCommand, hBSock, POP3S);
else
BSckSendString(hBSock, "-ERR Invalid command", POP3S.pPOP3Cfg->iTimeout);
return iCmdResult;
}
static int POP3HandleSession(ThreadConfig const *pThCfg, BSOCK_HANDLE hBSock)
{
/* Session structure declaration and init */
POP3Session POP3S;
ZeroData(POP3S); /* [i_a] */
if (POP3InitSession(pThCfg, hBSock, POP3S) < 0) {
ErrorPush();
UPopSendErrorResponse(hBSock, ErrGetErrorCode(), STD_POP3_TIMEOUT);
return ErrorPop();
}
char szIP[128] = "???.???.???.???";
SysLogMessage(LOG_LEV_MESSAGE, "POP3 client connection from [%s]\n",
SysInetNToA(POP3S.PeerInfo, szIP, sizeof(szIP)));
/* Send welcome message */
char szTime[256] = "";
MscGetTimeStr(szTime, sizeof(szTime) - 1);
if (BSckVSendString(hBSock, POP3S.pPOP3Cfg->iTimeout,
"+OK %s %s service ready; %s", POP3S.szTimeStamp,
POP3_SERVER_NAME, szTime) < 0) {
POP3ClearSession(POP3S);
return ErrGetErrorCode();
}
/* Command loop */
char szCommand[1024] = "";
while (!SvrInShutdown() && POP3S.iPOP3State != stateExit &&
BSckGetString(hBSock, szCommand, sizeof(szCommand) - 1,
POP3S.pPOP3Cfg->iSessionTimeout) != NULL &&
MscCmdStringCheck(szCommand) == 0) {
if (pThCfg->ulFlags & THCF_SHUTDOWN)
break;
/* Handle coomand */
POP3HandleCommand(szCommand, hBSock, POP3S);
}
SysLogMessage(LOG_LEV_MESSAGE, "POP3 client exit [%s]\n",
SysInetNToA(POP3S.PeerInfo, szIP, sizeof(szIP)));
POP3ClearSession(POP3S);
return 0;
}
unsigned int POP3ClientThread(void *pThreadData)
{
ThreadCreateCtx *pThCtx = (ThreadCreateCtx *) pThreadData;
/* Link socket to the bufferer */
BSOCK_HANDLE hBSock = BSckAttach(pThCtx->SockFD);
if (hBSock == INVALID_BSOCK_HANDLE) {
ErrorPush();
SysCloseSocket(pThCtx->SockFD);
SysFree(pThCtx);
return ErrorPop();
}
/*
* Do we need to switch to TLS?
*/
if (pThCtx->pThCfg->ulFlags & THCF_USE_SSL) {
int iError;
SslServerBind SSLB;
SslBindEnv SslE;
if (CSslBindSetup(&SSLB) < 0) {
ErrorPush();
BSckDetach(hBSock, 1);
SysFree(pThCtx);
return ErrorPop();
}
ZeroData(SslE);
iError = BSslBindServer(hBSock, &SSLB, MscSslEnvCB, &SslE);
CSslBindCleanup(&SSLB);
if (iError < 0) {
ErrorPush();
BSckDetach(hBSock, 1);
SysFree(pThCtx);
return ErrorPop();
}
/*
* We may want to add verify code here ...
*/
SysFree(SslE.pszIssuer);
SysFree(SslE.pszSubject);