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/* ========================================================================
* Copyright 1988-2008 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: IPOP3D - IMAP to POP3 conversion server
*
* Author: Mark Crispin
* UW Technology
* University of Washington
* Seattle, WA 98195
* Internet: MRC@Washington.EDU
*
* Date: 1 November 1990
* Last Edited: 19 February 2008
*/
/* Parameter files */
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
extern int errno; /* just in case */
#include <signal.h>
#include <time.h>
#include "c-client.h"
#define CRLF PSOUT ("\015\012") /* primary output terpri */
/* Autologout timer */
#define KODTIMEOUT 60*5
#define LOGINTIMEOUT 60*3
#define TIMEOUT 60*10
/* Server states */
#define AUTHORIZATION 0
#define TRANSACTION 1
#define UPDATE 2
#define LOGOUT 3
/* Eudora food */
#define STATUS "Status: %s%s\015\012"
#define SLEN (sizeof (STATUS)-3)
/* Global storage */
char *version = "104"; /* edit number of this server */
short state = AUTHORIZATION; /* server state */
short critical = NIL; /* non-zero if in critical code */
MAILSTREAM *stream = NIL; /* mailbox stream */
time_t idletime = 0; /* time we went idle */
unsigned long nmsgs = 0; /* current number of messages */
unsigned long ndele = 0; /* number of deletes */
unsigned long nseen = 0; /* number of mark-seens */
unsigned long last = 0; /* highest message accessed */
unsigned long il = 0; /* initial last message */
char challenge[128]; /* challenge */
char *host = NIL; /* remote host name */
char *user = NIL; /* user name */
char *pass = NIL; /* password */
char *initial = NIL; /* initial response */
long *msg = NIL; /* message translation vector */
short *flags = NIL; /* flags */
char *logout = "Logout";
char *goodbye = "+OK Sayonara\015\012";
/* POP3 flags */
#define DELE 0x1
#define SEEN 0x2
/* Function prototypes */
int main (int argc,char *argv[]);
void sayonara (int status);
void clkint ();
void kodint ();
void hupint ();
void trmint ();
int pass_login (char *t,int argc,char *argv[]);
char *apop_login (char *chal,char *user,char *md5,int argc,char *argv[]);
char *responder (void *challenge,unsigned long clen,unsigned long *rlen);
int mbxopen (char *mailbox);
long blat (char *text,long lines,unsigned long size,STRING *st);
void rset ();
/* Main program */
int main (int argc,char *argv[])
{
unsigned long i,j,k;
char *s,*t;
char tmp[MAILTMPLEN];
time_t autologouttime;
char *pgmname = (argc && argv[0]) ?
(((s = strrchr (argv[0],'/')) || (s = strrchr (argv[0],'\\'))) ?
s+1 : argv[0]) : "ipop3d";
/* set service name before linkage */
mail_parameters (NIL,SET_SERVICENAME,(void *) "pop");
#include "linkage.c"
/* initialize server */
server_init (pgmname,"pop3","pop3s",clkint,kodint,hupint,trmint,NIL);
mail_parameters (NIL,SET_BLOCKENVINIT,VOIDT);
s = myusername_full (&i); /* get user name and flags */
mail_parameters (NIL,SET_BLOCKENVINIT,NIL);
if (i == MU_LOGGEDIN) { /* allow EXTERNAL if logged in already */
mail_parameters (NIL,UNHIDE_AUTHENTICATOR,(void *) "EXTERNAL");
mail_parameters (NIL,SET_EXTERNALAUTHID,(void *) s);
}
{ /* set up MD5 challenge */
AUTHENTICATOR *auth = mail_lookup_auth (1);
while (auth && compare_cstring (auth->name,"CRAM-MD5")) auth = auth->next;
/* build challenge -- less than 128 chars */
if (auth && auth->server && !(auth->flags & AU_DISABLE))
sprintf (challenge,"<%lx.%lx@%.64s>",(unsigned long) getpid (),
(unsigned long) time (0),tcp_serverhost ());
else challenge[0] = '\0'; /* no MD5 authentication */
}
/* There are reports of POP3 clients which get upset if anything appears
* between the "+OK" and the "POP3" in the greeting.
*/
PSOUT ("+OK POP3 ");
if (!challenge[0]) { /* if no MD5 enable, output host name */
PSOUT (tcp_serverhost ());
PBOUT (' ');
}
PSOUT (CCLIENTVERSION);
PBOUT ('.');
PSOUT (version);
PSOUT (" server ready");
if (challenge[0]) { /* if MD5 enable, output challenge here */
PBOUT (' ');
PSOUT (challenge);
}
CRLF;
PFLUSH (); /* dump output buffer */
autologouttime = time (0) + LOGINTIMEOUT;
/* command processing loop */
while ((state != UPDATE) && (state != LOGOUT)) {
idletime = time (0); /* get a command under timeout */
alarm ((state == TRANSACTION) ? TIMEOUT : LOGINTIMEOUT);
clearerr (stdin); /* clear stdin errors */
/* read command line */
while (!PSIN (tmp,MAILTMPLEN)) {
/* ignore if some interrupt */
if (ferror (stdin) && (errno == EINTR)) clearerr (stdin);
else {
char *e = ferror (stdin) ?
strerror (errno) : "Unexpected client disconnect";
alarm (0); /* disable all interrupts */
server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
sprintf (logout = tmp,"%.80s, while reading line",e);
goodbye = NIL;
rset (); /* try to gracefully close the stream */
if (state == TRANSACTION) mail_close (stream);
stream = NIL;
state = LOGOUT;
sayonara (1);
}
}
alarm (0); /* make sure timeout disabled */
idletime = 0; /* no longer idle */
if (!strchr (tmp,'\012')) /* find end of line */
PSOUT ("-ERR Command line too long\015\012");
else if (!(s = strtok (tmp," \015\012")))
PSOUT ("-ERR Null command\015\012");
else { /* dispatch based on command */
ucase (s); /* canonicalize case */
/* snarf argument */
t = strtok (NIL,"\015\012");
/* QUIT command always valid */
if (!strcmp (s,"QUIT")) state = UPDATE;
else if (!strcmp (s,"CAPA")) {
AUTHENTICATOR *auth;
PSOUT ("+OK Capability list follows:\015\012");
PSOUT ("TOP\015\012LOGIN-DELAY 180\015\012UIDL\015\012");
if (s = ssl_start_tls (NIL)) fs_give ((void **) &s);
else PSOUT ("STLS\015\012");
if (i = !mail_parameters (NIL,GET_DISABLEPLAINTEXT,NIL))
PSOUT ("USER\015\012");
/* display secure server authenticators */
for (auth = mail_lookup_auth (1), s = "SASL"; auth; auth = auth->next)
if (auth->server && !(auth->flags & AU_DISABLE) &&
!(auth->flags & AU_HIDE) && (i || (auth->flags & AU_SECURE))) {
if (s) {
PSOUT (s);
s = NIL;
}
PBOUT (' ');
PSOUT (auth->name);
}
PSOUT (s ? ".\015\012" : "\015\012.\015\012");
}
else switch (state) { /* else dispatch based on state */
case AUTHORIZATION: /* waiting to get logged in */
if (!strcmp (s,"AUTH")) {
if (t && *t) { /* mechanism given? */
if (host) fs_give ((void **) &host);
if (user) fs_give ((void **) &user);
if (pass) fs_give ((void **) &pass);
s = strtok (t," "); /* get mechanism name */
/* get initial response */
if (initial = strtok (NIL,"\015\012")) {
if ((*initial == '=') && !initial[1]) ++initial;
else if (!*initial) initial = NIL;
}
if (!(user = cpystr (mail_auth (s,responder,argc,argv)))) {
PSOUT ("-ERR Bad authentication\015\012");
syslog (LOG_INFO,"AUTHENTICATE %s failure host=%.80s",s,
tcp_clienthost ());
}
else if ((state = mbxopen ("INBOX")) == TRANSACTION)
syslog (LOG_INFO,"Auth user=%.80s host=%.80s nmsgs=%lu/%lu",
user,tcp_clienthost (),nmsgs,stream->nmsgs);
else syslog (LOG_INFO,"Auth user=%.80s host=%.80s no mailbox",
user,tcp_clienthost ());
}
else {
AUTHENTICATOR *auth;
PSOUT ("+OK Supported authentication mechanisms:\015\012");
i = !mail_parameters (NIL,GET_DISABLEPLAINTEXT,NIL);
for (auth = mail_lookup_auth (1); auth; auth = auth->next)
if (auth->server && !(auth->flags & AU_DISABLE) &&
!(auth->flags & AU_HIDE) &&
(i || (auth->flags & AU_SECURE))) {
PSOUT (auth->name);
CRLF;
}
PBOUT ('.');
CRLF;
}
}
else if (!strcmp (s,"APOP")) {
if (challenge[0]) { /* can do it if have an MD5 challenge */
if (host) fs_give ((void **) &host);
if (user) fs_give ((void **) &user);
if (pass) fs_give ((void **) &pass);
/* get user name */
if (!(t && *t && (s = strtok (t," ")) && (t = strtok(NIL,"\012"))))
PSOUT ("-ERR Missing APOP argument\015\012");
else if (!(user = apop_login (challenge,s,t,argc,argv)))
PSOUT ("-ERR Bad APOP\015\012");
else if ((state = mbxopen ("INBOX")) == TRANSACTION)
syslog (LOG_INFO,"APOP user=%.80s host=%.80s nmsgs=%lu/%lu",
user,tcp_clienthost (),nmsgs,stream->nmsgs);
else syslog (LOG_INFO,"APOP user=%.80s host=%.80s no mailbox",
user,tcp_clienthost ());
}
else PSOUT ("-ERR Not supported\015\012");
}
/* (chuckle) */
else if (!strcmp (s,"RPOP"))
PSOUT ("-ERR Nice try, bunkie\015\012");
else if (!strcmp (s,"STLS")) {
if (t = ssl_start_tls (pgmname)) {
PSOUT ("-ERR STLS failed: ");
PSOUT (t);
CRLF;
}
else PSOUT ("+OK STLS completed\015\012");
}
else if (!mail_parameters (NIL,GET_DISABLEPLAINTEXT,NIL) &&
!strcmp (s,"USER")) {
if (host) fs_give ((void **) &host);
if (user) fs_give ((void **) &user);
if (pass) fs_give ((void **) &pass);
if (t && *t) { /* if user name given */
/* skip leading whitespace (bogus clients!) */
while (*t == ' ') ++t;
/* remote user name? */
if (s = strchr (t,':')) {
*s++ = '\0'; /* tie off host name */
host = cpystr (t);/* copy host name */
user = cpystr (s);/* copy user name */
}
/* local user name */
else user = cpystr (t);
PSOUT ("+OK User name accepted, password please\015\012");
}
else PSOUT ("-ERR Missing username argument\015\012");
}
else if (!mail_parameters (NIL,GET_DISABLEPLAINTEXT,NIL) &&
user && *user && !strcmp (s,"PASS"))
state = pass_login (t,argc,argv);
else PSOUT ("-ERR Unknown AUTHORIZATION state command\015\012");
break;
case TRANSACTION: /* logged in */
if (!strcmp (s,"STAT")) {
for (i = 1,j = 0,k = 0; i <= nmsgs; i++)
/* message still exists? */
if (msg[i] && !(flags[i] & DELE)) {
j++; /* count one more undeleted message */
k += mail_elt (stream,msg[i])->rfc822_size + SLEN;
}
sprintf (tmp,"+OK %lu %lu\015\012",j,k);
PSOUT (tmp);
}
else if (!strcmp (s,"LIST")) {
if (t && *t) { /* argument do single message */
if ((i = strtoul (t,NIL,10)) && (i <= nmsgs) && msg[i] &&
!(flags[i] & DELE)) {
sprintf (tmp,"+OK %lu %lu\015\012",i,
mail_elt(stream,msg[i])->rfc822_size + SLEN);
PSOUT (tmp);
}
else PSOUT ("-ERR No such message\015\012");
}
else { /* entire mailbox */
PSOUT ("+OK Mailbox scan listing follows\015\012");
for (i = 1,j = 0,k = 0; i <= nmsgs; i++)
if (msg[i] && !(flags[i] & DELE)) {
sprintf (tmp,"%lu %lu\015\012",i,
mail_elt (stream,msg[i])->rfc822_size + SLEN);
PSOUT (tmp);
}
PBOUT ('.'); /* end of list */
CRLF;
}
}
else if (!strcmp (s,"UIDL")) {
if (t && *t) { /* argument do single message */
if ((i = strtoul (t,NIL,10)) && (i <= nmsgs) && msg[i] &&
!(flags[i] & DELE)) {
sprintf (tmp,"+OK %lu %08lx%08lx\015\012",i,stream->uid_validity,
mail_uid (stream,msg[i]));
PSOUT (tmp);
}
else PSOUT ("-ERR No such message\015\012");
}
else { /* entire mailbox */
PSOUT ("+OK Unique-ID listing follows\015\012");
for (i = 1,j = 0,k = 0; i <= nmsgs; i++)
if (msg[i] && !(flags[i] & DELE)) {
sprintf (tmp,"%lu %08lx%08lx\015\012",i,stream->uid_validity,
mail_uid (stream,msg[i]));
PSOUT (tmp);
}
PBOUT ('.'); /* end of list */
CRLF;
}
}
else if (!strcmp (s,"RETR")) {
if (t && *t) { /* must have an argument */
if ((i = strtoul (t,NIL,10)) && (i <= nmsgs) && msg[i] &&
!(flags[i] & DELE)) {
MESSAGECACHE *elt;
/* update highest message accessed */
if (i > last) last = i;
sprintf (tmp,"+OK %lu octets\015\012",
(elt = mail_elt (stream,msg[i]))->rfc822_size + SLEN);
PSOUT (tmp);
/* if not marked seen or noted to be marked */
if (!(elt->seen || (flags[i] & SEEN))) {
++nseen; /* note that we need to mark it seen */
flags[i] |= SEEN;
}
/* get header */
t = mail_fetch_header (stream,msg[i],NIL,NIL,&k,FT_PEEK);
blat (t,-1,k,NIL);/* write up to trailing CRLF */
/* build status */
sprintf (tmp,STATUS,elt->seen ? "R" : " ",
elt->recent ? " " : "O");
if (k < 4) CRLF; /* don't write Status: if no header */
/* normal header ending with CRLF CRLF? */
else if (t[k-3] == '\012') {
PSOUT (tmp); /* write status */
CRLF; /* then write second CRLF */
}
else { /* abnormal - no blank line at end of header */
CRLF; /* write CRLF first then */
PSOUT (tmp);
}
/* output text */
t = mail_fetch_text (stream,msg[i],NIL,&k,
FT_RETURNSTRINGSTRUCT | FT_PEEK);
if (k) { /* only if there is a text body */
blat (t,-1,k,&stream->private.string);
CRLF; /* end of list */
}
PBOUT ('.');
CRLF;
}
else PSOUT ("-ERR No such message\015\012");
}
else PSOUT ("-ERR Missing message number argument\015\012");
}
else if (!strcmp (s,"DELE")) {
if (t && *t) { /* must have an argument */
if ((i = strtoul (t,NIL,10)) && (i <= nmsgs) && msg[i] &&
!(flags[i] & DELE)) {
/* update highest message accessed */
if (i > last) last = i;
flags[i] |= DELE; /* note that deletion is requested */
PSOUT ("+OK Message deleted\015\012");
++ndele; /* one more message deleted */
}
else PSOUT ("-ERR No such message\015\012");
}
else PSOUT ("-ERR Missing message number argument\015\012");
}
else if (!strcmp (s,"NOOP"))
PSOUT ("+OK No-op to you too!\015\012");
else if (!strcmp (s,"LAST")) {
sprintf (tmp,"+OK %lu\015\012",last);
PSOUT (tmp);
}
else if (!strcmp (s,"RSET")) {
rset (); /* reset the mailbox */
PSOUT ("+OK Reset state\015\012");
}
else if (!strcmp (s,"TOP")) {
if (t && *t && (i =strtoul (t,&s,10)) && (i <= nmsgs) && msg[i] &&
!(flags[i] & DELE)) {
/* skip whitespace */
while (*s == ' ') s++;
/* make sure line count argument good */
if ((*s >= '0') && (*s <= '9')) {
MESSAGECACHE *elt = mail_elt (stream,msg[i]);
j = strtoul (s,NIL,10);
/* update highest message accessed */
if (i > last) last = i;
PSOUT ("+OK Top of message follows\015\012");
/* get header */
t = mail_fetch_header (stream,msg[i],NIL,NIL,&k,FT_PEEK);
blat (t,-1,k,NIL);/* write up to trailing CRLF */
/* build status */
sprintf (tmp,STATUS,elt->seen ? "R" : " ",
elt->recent ? " " : "O");
if (k < 4) CRLF; /* don't write Status: if no header */
/* normal header ending with CRLF CRLF? */
else if (t[k-3] == '\012') {
PSOUT (tmp); /* write status */
CRLF; /* then write second CRLF */
}
else { /* abnormal - no blank line at end of header */
CRLF; /* write CRLF first then */
PSOUT (tmp);
}
if (j) { /* want any text lines? */
/* output text */
t = mail_fetch_text (stream,msg[i],NIL,&k,
FT_PEEK | FT_RETURNSTRINGSTRUCT);
/* tie off final line if full text output */
if (k && (j -= blat (t,j,k,&stream->private.string))) CRLF;
}
PBOUT ('.'); /* end of list */
CRLF;
}
else PSOUT ("-ERR Bad line count argument\015\012");
}
else PSOUT ("-ERR Bad message number argument\015\012");
}
else if (!strcmp (s,"XTND"))
PSOUT ("-ERR Sorry I can't do that\015\012");
else PSOUT ("-ERR Unknown TRANSACTION state command\015\012");
break;
default:
PSOUT ("-ERR Server in unknown state\015\012");
break;
}
}
PFLUSH (); /* make sure output finished */
if (autologouttime) { /* have an autologout in effect? */
/* cancel if no longer waiting for login */
if (state != AUTHORIZATION) autologouttime = 0;
/* took too long to login */
else if (autologouttime < time (0)) {
goodbye = "-ERR Autologout\015\012";
logout = "Autologout";
state = LOGOUT; /* sayonara */
}
}
}
/* open and need to update? */
if (stream && (state == UPDATE)) {
if (nseen) { /* only bother if messages need marking seen */
*(s = tmp) = '\0'; /* clear sequence */
for (i = 1; i <= nmsgs; ++i) if (flags[i] & SEEN) {
for (j = i + 1, k = 0; (j <= nmsgs) && (flags[j] & SEEN); ++j) k = j;
if (k) sprintf (s,",%lu:%lu",i,k);
else sprintf (s,",%lu",i);
s += strlen (s); /* point to end of string */
if ((s - tmp) > (MAILTMPLEN - 30)) {
mail_setflag (stream,tmp + 1,"\\Seen");
*(s = tmp) = '\0'; /* restart sequence */
}
i = j; /* continue after the range */
}
if (tmp[0]) mail_setflag (stream,tmp + 1,"\\Seen");
}
if (ndele) { /* any messages to delete? */
*(s = tmp) = '\0'; /* clear sequence */
for (i = 1; i <= nmsgs; ++i) if (flags[i] & DELE) {
for (j = i + 1, k = 0; (j <= nmsgs) && (flags[j] & DELE); ++j) k = j;
if (k) sprintf (s,",%lu:%lu",i,k);
else sprintf (s,",%lu",i);
s += strlen (s); /* point to end of string */
if ((s - tmp) > (MAILTMPLEN - 30)) {
mail_setflag (stream,tmp + 1,"\\Deleted");
*(s = tmp) = '\0'; /* restart sequence */
}
i = j; /* continue after the range */
}
if (tmp[0]) mail_setflag (stream,tmp + 1,"\\Deleted");
mail_expunge (stream);
}
syslog (LOG_INFO,"Update user=%.80s host=%.80s nmsgs=%lu ndele=%lu nseen=%lu",
user,tcp_clienthost (),stream->nmsgs,ndele,nseen);
mail_close (stream);
}
sayonara (0);
return 0; /* stupid compilers */
}
/* Say goodbye
* Accepts: exit status
*
* Does not return
*/
void sayonara (int status)
{
logouthook_t lgoh = (logouthook_t) mail_parameters (NIL,GET_LOGOUTHOOK,NIL);
if (goodbye) { /* have a goodbye message? */
PSOUT (goodbye);
PFLUSH (); /* make sure blatted */
}
syslog (LOG_INFO,"%s user=%.80s host=%.80s",logout,
user ? (char *) user : "???",tcp_clienthost ());
/* do logout hook if needed */
if (lgoh) (*lgoh) (mail_parameters (NIL,GET_LOGOUTDATA,NIL));
_exit (status); /* all done */
}
/* Clock interrupt
*/
void clkint ()
{
alarm (0); /* disable all interrupts */
server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
goodbye = "-ERR Autologout; idle for too long\015\012";
logout = "Autologout";
if (critical) state = LOGOUT; /* badly hosed if in critical code */
else { /* try to gracefully close the stream */
if ((state == TRANSACTION) && !stream->lock) {
rset ();
mail_close (stream);
}
state = LOGOUT;
stream = NIL;
sayonara (1);
}
}
/* Kiss Of Death interrupt
*/
void kodint ()
{
/* only if idle */
if (idletime && ((time (0) - idletime) > KODTIMEOUT)) {
alarm (0); /* disable all interrupts */
server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
goodbye = "-ERR Received Kiss of Death\015\012";
logout = "Killed (lost mailbox lock)";
if (critical) state =LOGOUT;/* must defer if in critical code */
else { /* try to gracefully close the stream */
if ((state == TRANSACTION) && !stream->lock) {
rset ();
mail_close (stream);
}
state = LOGOUT;
stream = NIL;
sayonara (1); /* die die die */
}
}
}
/* Hangup interrupt
*/
void hupint ()
{
alarm (0); /* disable all interrupts */
server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
goodbye = NIL; /* nobody left to talk to */
logout = "Hangup";
if (critical) state = LOGOUT; /* must defer if in critical code */
else { /* try to gracefully close the stream */
if ((state == TRANSACTION) && !stream->lock) {
rset ();
mail_close (stream);
}
state = LOGOUT;
stream = NIL;
sayonara (1); /* die die die */
}
}
/* Termination interrupt
*/
void trmint ()
{
alarm (0); /* disable all interrupts */
server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
goodbye = "-ERR Killed\015\012";
logout = "Killed";
if (critical) state = LOGOUT; /* must defer if in critical code */
/* Make no attempt at graceful closure since a shutdown may be in
* progress, and we won't have any time to do mail_close() actions.
*/
else sayonara (1); /* die die die */
}
/* Parse PASS command
* Accepts: pointer to command argument
* Returns: new state
*/
int pass_login (char *t,int argc,char *argv[])
{
char tmp[MAILTMPLEN];
/* flush old passowrd */
if (pass) fs_give ((void **) &pass);
if (!(t && *t)) { /* if no password given */
PSOUT ("-ERR Missing password argument\015\012");
return AUTHORIZATION;
}
pass = cpystr (t); /* copy password argument */
if (!host) { /* want remote mailbox? */
/* no, delimit user from possible admin */
if (t = strchr (user,'*')) *t++ ='\0';
/* attempt the login */
if (server_login (user,pass,t,argc,argv)) {
int ret = mbxopen ("INBOX");
if (ret == TRANSACTION) /* mailbox opened OK? */
syslog (LOG_INFO,"%sLogin user=%.80s host=%.80s nmsgs=%lu/%lu",
t ? "Admin " : "",user,tcp_clienthost (),nmsgs,stream->nmsgs);
else syslog (LOG_INFO,"%sLogin user=%.80s host=%.80s no mailbox",
t ? "Admin " : "",user,tcp_clienthost ());
return ret;
}
}
#ifndef DISABLE_POP_PROXY
/* remote; build remote INBOX */
else if (anonymous_login (argc,argv)) {
syslog (LOG_INFO,"IMAP login to host=%.80s user=%.80s host=%.80s",host,
user,tcp_clienthost ());
sprintf (tmp,"{%.128s/user=%.128s}INBOX",host,user);
/* disable rimap just in case */
mail_parameters (NIL,SET_RSHTIMEOUT,0);
return mbxopen (tmp);
}
#endif
/* vague error message to confuse crackers */
PSOUT ("-ERR Bad login\015\012");
return AUTHORIZATION;
}
/* Authentication responder
* Accepts: challenge
* length of challenge
* pointer to response length return location if non-NIL
* Returns: response
*/
#define RESPBUFLEN 8*MAILTMPLEN
char *responder (void *challenge,unsigned long clen,unsigned long *rlen)
{
unsigned long i,j;
unsigned char *t,resp[RESPBUFLEN];
char tmp[MAILTMPLEN];
if (initial) { /* initial response given? */
if (clen) return NIL; /* not permitted */
/* set up response */
t = (unsigned char *) initial;
initial = NIL; /* no more initial response */
return (char *) rfc822_base64 (t,strlen ((char *) t),rlen ? rlen : &i);
}
PSOUT ("+ ");
for (t = rfc822_binary (challenge,clen,&i),j = 0; j < i; j++)
if (t[j] > ' ') PBOUT (t[j]);
fs_give ((void **) &t);
CRLF;
PFLUSH (); /* dump output buffer */
resp[RESPBUFLEN-1] = '\0'; /* last buffer character is guaranteed NUL */
alarm (LOGINTIMEOUT); /* get a response under timeout */
clearerr (stdin); /* clear stdin errors */
/* read buffer */
while (!PSIN ((char *) resp,RESPBUFLEN)) {
/* ignore if some interrupt */
if (ferror (stdin) && (errno == EINTR)) clearerr (stdin);
else {
char *e = ferror (stdin) ?
strerror (errno) : "Command stream end of file";
alarm (0); /* disable all interrupts */
server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
sprintf (logout = tmp,"%.80s, while reading authentication",e);
goodbye = NIL;
state = LOGOUT;
sayonara (1);
}
}
if (!(t = (unsigned char *) strchr ((char *) resp,'\012'))) {
int c;
while ((c = PBIN ()) != '\012') if (c == EOF) {
/* ignore if some interrupt */
if (ferror (stdin) && (errno == EINTR)) clearerr (stdin);
else {
char *e = ferror (stdin) ?
strerror (errno) : "Command stream end of file";
alarm (0); /* disable all interrupts */
server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
sprintf (logout = tmp,"%.80s, while reading auth char",e);
goodbye = NIL;
state = LOGOUT;
sayonara (1);
}
}
return NIL;
}
alarm (0); /* make sure timeout disabled */
if (t[-1] == '\015') --t; /* remove CR */
*t = '\0'; /* tie off buffer */
return (resp[0] != '*') ?
(char *) rfc822_base64 (resp,t-resp,rlen ? rlen : &i) : NIL;
}
/* Select mailbox
* Accepts: mailbox name
* Returns: new state
*/
int mbxopen (char *mailbox)
{
unsigned long i,j;
char tmp[MAILTMPLEN];
MESSAGECACHE *elt;
if (msg) fs_give ((void **) &msg);
/* open mailbox */
if (!(stream = mail_open (stream,mailbox,NIL)))
goodbye = "-ERR Unable to open user's INBOX\015\012";
else if (stream->rdonly) /* make sure not readonly */
goodbye = "-ERR Can't get lock. Mailbox in use\015\012";
else {
nmsgs = 0; /* no messages yet */
if (j = stream->nmsgs) { /* if mailbox non-empty */
sprintf (tmp,"1:%lu",j); /* fetch fast information for all messages */
mail_fetch_fast (stream,tmp,NIL);
}
/* create 1-origin tables */
msg = (long *) fs_get (++j * sizeof (long));
flags = (short *) fs_get (j * sizeof (short));
/* build map */
for (i = 1; i < j; ++i) if (!(elt = mail_elt (stream,i))->deleted) {
msg[++nmsgs] = i; /* note the presence of this message */
if (elt->seen) il = nmsgs;/* and set up initial LAST */
}
/* make sure unused map entries are zero */
for (i = nmsgs + 1; i < j; ++i) msg[i] = 0;
rset (); /* do implicit RSET */
sprintf (tmp,"+OK Mailbox open, %lu messages\015\012",nmsgs);
PSOUT (tmp);
return TRANSACTION;
}
syslog (LOG_INFO,"Error opening or locking INBOX user=%.80s host=%.80s",
user,tcp_clienthost ());
return UPDATE;
}
/* Blat a string with dot checking
* Accepts: string
* maximum number of lines if greater than zero
* maximum number of bytes to output
* alternative stringstruct
* Returns: number of lines output
*
* This routine is uglier and kludgier than it should be, just to be robust
* in the case of a message which doesn't end in a newline. Yes, this routine
* does truncate the last two bytes from the text. Since it is normally a
* newline and the main routine adds it back, it usually does not make a
* difference. But if it isn't, since the newline is required and the octet
* counts have to match, there's no choice but to truncate.
*/
long blat (char *text,long lines,unsigned long size,STRING *st)
{
char c,d,e;
long ret = 0;
/* no-op if zero lines or empty string */
if (!(lines && (size-- > 2))) return 0;
if (text) {
c = *text++; d = *text++; /* collect first two bytes */
if (c == '.') PBOUT ('.'); /* double string-leading dot if necessary */
while (lines && --size) { /* copy loop */
e = *text++; /* get next byte */
PBOUT (c); /* output character */
if (c == '\012') { /* end of line? */
ret++; --lines; /* count another line */
/* double leading dot as necessary */
if (lines && size && (d == '.')) PBOUT ('.');
}
c = d; d = e; /* move to next character */
}
}
else {
c = SNX (st); d = SNX (st); /* collect first two bytes */
if (c == '.') PBOUT ('.'); /* double string-leading dot if necessary */
while (lines && --size) { /* copy loop */
e = SNX (st); /* get next byte */
PBOUT (c); /* output character */
if (c == '\012') { /* end of line? */
ret++; --lines; /* count another line */
/* double leading dot as necessary */
if (lines && size && (d == '.')) PBOUT ('.');
}
c = d; d = e; /* move to next character */
}
}
return ret;
}
/* Reset mailbox
*/
void rset ()
{
/* clear all flags */
if (flags) memset ((void *) flags,0,(nmsgs + 1) * sizeof (short));
ndele = nseen = 0; /* no more deleted or seen messages */
last = il; /* restore previous LAST value */
}
/* Co-routines from MAIL library */
/* Message matches a search
* Accepts: MAIL stream
* message number
*/
void mm_searched (MAILSTREAM *stream,unsigned long msgno)
{
/* Never called */
}
/* Message exists (i.e. there are that many messages in the mailbox)
* Accepts: MAIL stream
* message number
*/
void mm_exists (MAILSTREAM *stream,unsigned long number)
{
/* Can't use this mechanism. POP has no means of notifying the client of
new mail during the session. */
}
/* Message expunged
* Accepts: MAIL stream
* message number
*/
void mm_expunged (MAILSTREAM *stream,unsigned long number)
{
unsigned long i = number + 1;
msg[number] = 0; /* I bet that this will annoy someone */
while (i <= nmsgs) --msg[i++];
}
/* Message flag status change
* Accepts: MAIL stream
* message number
*/
void mm_flags (MAILSTREAM *stream,unsigned long number)
{
/* This isn't used */
}
/* Mailbox found
* Accepts: MAIL stream
* hierarchy delimiter
* mailbox name
* mailbox attributes
*/
void mm_list (MAILSTREAM *stream,int delimiter,char *name,long attributes)
{
/* This isn't used */
}
/* Subscribe mailbox found
* Accepts: MAIL stream
* hierarchy delimiter
* mailbox name
* mailbox attributes
*/
void mm_lsub (MAILSTREAM *stream,int delimiter,char *name,long attributes)
{
/* This isn't used */
}
/* Mailbox status
* Accepts: MAIL stream
* mailbox name
* mailbox status
*/
void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
{
/* This isn't used */
}
/* Notification event
* Accepts: MAIL stream
* string to log
* error flag
*/
void mm_notify (MAILSTREAM *stream,char *string,long errflg)
{
mm_log (string,errflg); /* just do mm_log action */
}
/* Log an event for the user to see
* Accepts: string to log
* error flag
*/
void mm_log (char *string,long errflg)
{
switch (errflg) {
case NIL: /* information message */
case PARSE: /* parse glitch */
break; /* too many of these to log */
case WARN: /* warning */
syslog (LOG_DEBUG,"%s",string);
break;
case BYE: /* driver broke connection */
if (state != UPDATE) {
char tmp[MAILTMPLEN];
alarm (0); /* disable all interrupts */
server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
sprintf (logout = tmp,"Mailbox closed (%.80s)",string);
goodbye = NIL;
state = LOGOUT;
sayonara (1);
}
break;
case ERROR: /* error that broke command */
default: /* default should never happen */
syslog (LOG_NOTICE,"%s",string);
break;
}
}
/* Log an event to debugging telemetry
* Accepts: string to log
*/
void mm_dlog (char *string)
{
/* Not doing anything here for now */
}
/* Get user name and password for this host
* Accepts: parse of network mailbox name
* where to return user name
* where to return password
* trial count
*/
void mm_login (NETMBX *mb,char *username,char *password,long trial)
{
/* set user name */
strncpy (username,*mb->user ? mb->user : user,NETMAXUSER-1);
if (pass) {
strncpy (password,pass,255);/* and password */
fs_give ((void **) &pass);
}
else memset (password,0,256); /* no password to send, abort login */
username[NETMAXUSER] = password[255] = '\0';
}
/* About to enter critical code
* Accepts: stream
*/
void mm_critical (MAILSTREAM *stream)
{
++critical;
}
/* About to exit critical code
* Accepts: stream
*/
void mm_nocritical (MAILSTREAM *stream)
{
--critical;
}
/* Disk error found
* Accepts: stream
* system error code
* flag indicating that mailbox may be clobbered
* Returns: abort flag
*/
long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
{
if (serious) { /* try your damnest if clobberage likely */
syslog (LOG_ALERT,
"Retrying after disk error user=%.80s host=%.80s mbx=%.80s: %.80s",
user,tcp_clienthost (),
(stream && stream->mailbox) ? stream->mailbox : "???",
strerror (errcode));
alarm (0); /* make damn sure timeout disabled */
sleep (60); /* give it some time to clear up */
return NIL;
}
syslog (LOG_ALERT,"Fatal disk error user=%.80s host=%.80s mbx=%.80s: %.80s",
user,tcp_clienthost (),
(stream && stream->mailbox) ? stream->mailbox : "???",
strerror (errcode));
return T;
}
/* Log a fatal error event
* Accepts: string to log
*/
void mm_fatal (char *string)
{
mm_log (string,ERROR); /* shouldn't happen normally */
}
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