+++ /dev/null
-// POP3 service for the Citadel system
-//
-// Copyright (c) 1998-2021 by the citadel.org team
-//
-// This program is open source software; you can redistribute it and/or modify
-// it under the terms of the GNU General Public License version 3.
-//
-// 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.
-//
-// Current status of standards conformance:
-//
-// -> All required POP3 commands described in RFC1939 are implemented.
-// -> All optional POP3 commands described in RFC1939 are also implemented.
-// -> The deprecated "LAST" command is included in this implementation, because
-// there exist mail clients which insist on using it (such as Bynari
-// TradeMail, and certain versions of Eudora).
-// -> Capability detection via the method described in RFC2449 is implemented.
-
-#include "sysdep.h"
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <pwd.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <time.h>
-#include <sys/wait.h>
-#include <string.h>
-#include <limits.h>
-#include <ctype.h>
-#include <libcitadel.h>
-#include "citadel.h"
-#include "server.h"
-#include "citserver.h"
-#include "support.h"
-#include "config.h"
-#include "user_ops.h"
-#include "database.h"
-#include "msgbase.h"
-#include "internet_addressing.h"
-#include "serv_pop3.h"
-#include "ctdl_module.h"
-
-
-// This cleanup function blows away the temporary memory and files used by
-// the POP3 server.
-void pop3_cleanup_function(void) {
- /* Don't do this stuff if this is not a POP3 session! */
- if (CC->h_command_function != pop3_command_loop) return;
-
- struct citpop3 *pop3 = ((struct citpop3 *)CC->session_specific_data);
- syslog(LOG_DEBUG, "pop3: performing cleanup hook");
- if (pop3->msgs != NULL) {
- free(pop3->msgs);
- }
-
- free(pop3);
-}
-
-
-// Here's where our POP3 session begins its happy day.
-void pop3_greeting(void) {
- strcpy(CC->cs_clientname, "POP3 session");
- CC->internal_pgm = 1;
- CC->session_specific_data = malloc(sizeof(struct citpop3));
- memset(POP3, 0, sizeof(struct citpop3));
-
- cprintf("+OK Citadel POP3 server ready.\r\n");
-}
-
-
-// POP3S is just like POP3, except it goes crypto right away.
-void pop3s_greeting(void) {
- CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
-
-/* kill session if no crypto */
-#ifdef HAVE_OPENSSL
- if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO;
-#else
- CC->kill_me = KILLME_NO_CRYPTO;
-#endif
-
- pop3_greeting();
-}
-
-
-// Specify user name (implements POP3 "USER" command)
-void pop3_user(char *argbuf) {
- char username[SIZ];
-
- if (CC->logged_in) {
- cprintf("-ERR You are already logged in.\r\n");
- return;
- }
-
- strcpy(username, argbuf);
- striplt(username);
-
- if (CtdlLoginExistingUser(username) == login_ok) {
- cprintf("+OK Password required for %s\r\n", username);
- }
- else {
- cprintf("-ERR No such user.\r\n");
- }
-}
-
-
-// Back end for pop3_grab_mailbox()
-void pop3_add_message(long msgnum, void *userdata) {
- struct MetaData smi;
-
- ++POP3->num_msgs;
- if (POP3->num_msgs < 2) {
- POP3->msgs = malloc(sizeof(struct pop3msg));
- }
- else {
- POP3->msgs = realloc(POP3->msgs, (POP3->num_msgs * sizeof(struct pop3msg)) ) ;
- }
- POP3->msgs[POP3->num_msgs-1].msgnum = msgnum;
- POP3->msgs[POP3->num_msgs-1].deleted = 0;
-
- // We need to know the length of this message when it is printed in
- // RFC822 format. Perhaps we have cached this length in the message's
- // metadata record. If so, great; if not, measure it and then cache
- // it for next time.
- GetMetaData(&smi, msgnum);
- if (smi.meta_rfc822_length <= 0L) {
- CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
- CtdlOutputMsg(msgnum, MT_RFC822, HEADERS_ALL, 0, 1, NULL, SUPPRESS_ENV_TO, NULL, NULL, NULL);
- smi.meta_rfc822_length = StrLength(CC->redirect_buffer);
- FreeStrBuf(&CC->redirect_buffer);
- PutMetaData(&smi);
- }
- POP3->msgs[POP3->num_msgs-1].rfc822_length = smi.meta_rfc822_length;
-}
-
-
-// Open the inbox and read its contents.
-// (This should be called only once, by pop3_pass(), and returns the number
-// of messages in the inbox, or -1 for error)
-int pop3_grab_mailbox(void) {
- visit vbuf;
- int i;
-
- if (CtdlGetRoom(&CC->room, MAILROOM) != 0) return(-1);
-
- /* Load up the messages */
- CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL, pop3_add_message, NULL);
-
- /* Figure out which are old and which are new */
- CtdlGetRelationship(&vbuf, &CC->user, &CC->room);
- POP3->lastseen = (-1);
- if (POP3->num_msgs) for (i=0; i<POP3->num_msgs; ++i) {
- if (is_msg_in_sequence_set(vbuf.v_seen, (POP3->msgs[POP3->num_msgs-1].msgnum) )) {
- POP3->lastseen = i;
- }
- }
-
- return(POP3->num_msgs);
-}
-
-
-void pop3_login(void) {
- int msgs;
-
- msgs = pop3_grab_mailbox();
- if (msgs >= 0) {
- cprintf("+OK %s is logged in (%d messages)\r\n",
- CC->user.fullname, msgs);
- syslog(LOG_DEBUG, "pop3: authenticated %s", CC->user.fullname);
- }
- else {
- cprintf("-ERR Can't open your mailbox\r\n");
- }
-
-}
-
-
-// Authorize with password (implements POP3 "PASS" command)
-void pop3_pass(char *argbuf) {
- char password[SIZ];
-
- safestrncpy(password, argbuf, sizeof password);
- striplt(password);
-
- if (CtdlTryPassword(password, strlen(password)) == pass_ok) {
- pop3_login();
- }
- else {
- cprintf("-ERR That is NOT the password.\r\n");
- }
-}
-
-
-// list available msgs
-void pop3_list(char *argbuf) {
- int i;
- int which_one;
-
- which_one = atoi(argbuf);
-
- // "list one" mode
- if (which_one > 0) {
- if (which_one > POP3->num_msgs) {
- cprintf("-ERR no such message, only %d are here\r\n", POP3->num_msgs);
- return;
- }
- else if (POP3->msgs[which_one-1].deleted) {
- cprintf("-ERR Sorry, you deleted that message.\r\n");
- return;
- }
- else {
- cprintf("+OK %d %ld\r\n", which_one, (long)POP3->msgs[which_one-1].rfc822_length);
- return;
- }
- }
-
- // "list all" (scan listing) mode
- else {
- cprintf("+OK Here's your mail:\r\n");
- if (POP3->num_msgs > 0) for (i=0; i<POP3->num_msgs; ++i) {
- if (! POP3->msgs[i].deleted) {
- cprintf("%d %ld\r\n", i+1, (long)POP3->msgs[i].rfc822_length);
- }
- }
- cprintf(".\r\n");
- }
-}
-
-
-// STAT (tally up the total message count and byte count) command
-void pop3_stat(char *argbuf) {
- int total_msgs = 0;
- size_t total_octets = 0;
- int i;
-
- if (POP3->num_msgs > 0) for (i=0; i<POP3->num_msgs; ++i) {
- if (! POP3->msgs[i].deleted) {
- ++total_msgs;
- total_octets += POP3->msgs[i].rfc822_length;
- }
- }
-
- cprintf("+OK %d %ld\r\n", total_msgs, (long)total_octets);
-}
-
-
-// RETR command (fetch a message)
-void pop3_retr(char *argbuf) {
- int which_one;
-
- which_one = atoi(argbuf);
- if ( (which_one < 1) || (which_one > POP3->num_msgs) ) {
- cprintf("-ERR No such message.\r\n");
- return;
- }
-
- if (POP3->msgs[which_one - 1].deleted) {
- cprintf("-ERR Sorry, you deleted that message.\r\n");
- return;
- }
-
- cprintf("+OK Message %d:\r\n", which_one);
- CtdlOutputMsg(POP3->msgs[which_one - 1].msgnum, MT_RFC822,
- HEADERS_ALL, 0, 1, NULL,
- (ESC_DOT|SUPPRESS_ENV_TO), NULL, NULL, NULL
- );
- cprintf(".\r\n");
-}
-
-
-// TOP command (dumb way of fetching a partial message or headers-only)
-void pop3_top(char *argbuf) {
- int which_one;
- int lines_requested = 0;
- int lines_dumped = 0;
- char buf[1024];
- StrBuf *msgtext;
- const char *ptr;
- int in_body = 0;
- int done = 0;
-
- sscanf(argbuf, "%d %d", &which_one, &lines_requested);
- if ( (which_one < 1) || (which_one > POP3->num_msgs) ) {
- cprintf("-ERR No such message.\r\n");
- return;
- }
-
- if (POP3->msgs[which_one - 1].deleted) {
- cprintf("-ERR Sorry, you deleted that message.\r\n");
- return;
- }
-
- CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
-
- CtdlOutputMsg(POP3->msgs[which_one - 1].msgnum,
- MT_RFC822,
- HEADERS_ALL,
- 0, 1, NULL,
- SUPPRESS_ENV_TO,
- NULL, NULL, NULL);
-
- msgtext = CC->redirect_buffer;
- CC->redirect_buffer = NULL;
-
- cprintf("+OK Message %d:\r\n", which_one);
-
- ptr = ChrPtr(msgtext);
- while (ptr = cmemreadline(ptr, buf, (sizeof buf - 2)),
- ( (*ptr != 0) && (done == 0))) {
- strcat(buf, "\r\n");
- if (in_body == 1) {
- if (lines_dumped >= lines_requested) {
- done = 1;
- }
- }
- if ((in_body == 0) || (done == 0)) {
- client_write(buf, strlen(buf));
- }
- if (in_body) {
- ++lines_dumped;
- }
- if ((buf[0]==13)||(buf[0]==10)) in_body = 1;
- }
-
- if (buf[strlen(buf)-1] != 10) cprintf("\n");
- FreeStrBuf(&msgtext);
-
- cprintf(".\r\n");
-}
-
-
-// DELE (delete message from mailbox)
-void pop3_dele(char *argbuf) {
- int which_one;
-
- which_one = atoi(argbuf);
- if ( (which_one < 1) || (which_one > POP3->num_msgs) ) {
- cprintf("-ERR No such message.\r\n");
- return;
- }
-
- if (POP3->msgs[which_one - 1].deleted) {
- cprintf("-ERR You already deleted that message.\r\n");
- return;
- }
-
- // Flag the message as deleted. Will expunge during QUIT command.
- POP3->msgs[which_one - 1].deleted = 1;
- cprintf("+OK Message %d deleted.\r\n",
- which_one);
-}
-
-
-// Perform "UPDATE state" stuff
-void pop3_update(void) {
- int i;
- visit vbuf;
-
- long *deletemsgs = NULL;
- int num_deletemsgs = 0;
-
- // Remove messages marked for deletion
- if (POP3->num_msgs > 0) {
- deletemsgs = malloc(POP3->num_msgs * sizeof(long));
- for (i=0; i<POP3->num_msgs; ++i) {
- if (POP3->msgs[i].deleted) {
- deletemsgs[num_deletemsgs++] = POP3->msgs[i].msgnum;
- }
- }
- if (num_deletemsgs > 0) {
- CtdlDeleteMessages(MAILROOM, deletemsgs, num_deletemsgs, "");
- }
- free(deletemsgs);
- }
-
- // Set last read pointer
- if (POP3->num_msgs > 0) {
- CtdlLockGetCurrentUser();
- CtdlGetRelationship(&vbuf, &CC->user, &CC->room);
- snprintf(vbuf.v_seen, sizeof vbuf.v_seen, "*:%ld", POP3->msgs[POP3->num_msgs-1].msgnum);
- CtdlSetRelationship(&vbuf, &CC->user, &CC->room);
- CtdlPutCurrentUserLock();
- }
-
-}
-
-
-// RSET (reset, i.e. undelete any deleted messages) command
-void pop3_rset(char *argbuf) {
- int i;
-
- if (POP3->num_msgs > 0) for (i=0; i<POP3->num_msgs; ++i) {
- if (POP3->msgs[i].deleted) {
- POP3->msgs[i].deleted = 0;
- }
- }
- cprintf("+OK Reset completed.\r\n");
-}
-
-
-// LAST (Determine which message is the last unread message)
-void pop3_last(char *argbuf) {
- cprintf("+OK %d\r\n", POP3->lastseen + 1);
-}
-
-
-// CAPA is a command which tells the client which POP3 extensions are supported.
-void pop3_capa(void) {
- cprintf("+OK Capability list follows\r\n"
- "TOP\r\n"
- "USER\r\n"
- "UIDL\r\n"
- "IMPLEMENTATION %s\r\n"
- ".\r\n"
- ,
- CITADEL
- );
-}
-
-
-// UIDL (Universal IDentifier Listing) is easy. Our 'unique' message
-// identifiers are simply the Citadel message numbers in the database.
-void pop3_uidl(char *argbuf) {
- int i;
- int which_one;
-
- which_one = atoi(argbuf);
-
- // "list one" mode
- if (which_one > 0) {
- if (which_one > POP3->num_msgs) {
- cprintf("-ERR no such message, only %d are here\r\n", POP3->num_msgs);
- return;
- }
- else if (POP3->msgs[which_one-1].deleted) {
- cprintf("-ERR Sorry, you deleted that message.\r\n");
- return;
- }
- else {
- cprintf("+OK %d %ld\r\n", which_one, POP3->msgs[which_one-1].msgnum);
- return;
- }
- }
-
- // "list all" (scan listing) mode
- else {
- cprintf("+OK Here's your mail:\r\n");
- if (POP3->num_msgs > 0) for (i=0; i<POP3->num_msgs; ++i) {
- if (! POP3->msgs[i].deleted) {
- cprintf("%d %ld\r\n", i+1, POP3->msgs[i].msgnum);
- }
- }
- cprintf(".\r\n");
- }
-}
-
-
-// implements the STLS command (Citadel API version)
-void pop3_stls(void) {
- char ok_response[SIZ];
- char nosup_response[SIZ];
- char error_response[SIZ];
-
- sprintf(ok_response, "+OK Begin TLS negotiation now\r\n");
- sprintf(nosup_response, "-ERR TLS not supported here\r\n");
- sprintf(error_response, "-ERR Internal error\r\n");
- CtdlModuleStartCryptoMsgs(ok_response, nosup_response, error_response);
-}
-
-
-// Main command loop for POP3 sessions.
-void pop3_command_loop(void) {
- char cmdbuf[SIZ];
-
- time(&CC->lastcmd);
- memset(cmdbuf, 0, sizeof cmdbuf); // Clear it, just in case
- if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
- syslog(LOG_INFO, "pop3: client disconnected; ending session.");
- CC->kill_me = KILLME_CLIENT_DISCONNECTED;
- return;
- }
- if (!strncasecmp(cmdbuf, "PASS", 4)) {
- syslog(LOG_DEBUG, "pop3: PASS...");
- }
- else {
- syslog(LOG_DEBUG, "pop3: %s", cmdbuf);
- }
- while (strlen(cmdbuf) < 5) strcat(cmdbuf, " ");
-
- if (!strncasecmp(cmdbuf, "NOOP", 4)) {
- cprintf("+OK No operation.\r\n");
- }
-
- else if (!strncasecmp(cmdbuf, "CAPA", 4)) {
- pop3_capa();
- }
-
- else if (!strncasecmp(cmdbuf, "QUIT", 4)) {
- cprintf("+OK Goodbye...\r\n");
- pop3_update();
- CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
- return;
- }
-
- else if (!strncasecmp(cmdbuf, "USER", 4)) {
- pop3_user(&cmdbuf[5]);
- }
-
- else if (!strncasecmp(cmdbuf, "PASS", 4)) {
- pop3_pass(&cmdbuf[5]);
- }
-
-#ifdef HAVE_OPENSSL
- else if (!strncasecmp(cmdbuf, "STLS", 4)) {
- pop3_stls();
- }
-#endif
-
- else if (!CC->logged_in) {
- cprintf("-ERR Not logged in.\r\n");
- }
-
- else if (CC->nologin) {
- cprintf("-ERR System busy, try later.\r\n");
- CC->kill_me = KILLME_NOLOGIN;
- }
-
- else if (!strncasecmp(cmdbuf, "LIST", 4)) {
- pop3_list(&cmdbuf[5]);
- }
-
- else if (!strncasecmp(cmdbuf, "STAT", 4)) {
- pop3_stat(&cmdbuf[5]);
- }
-
- else if (!strncasecmp(cmdbuf, "RETR", 4)) {
- pop3_retr(&cmdbuf[5]);
- }
-
- else if (!strncasecmp(cmdbuf, "DELE", 4)) {
- pop3_dele(&cmdbuf[5]);
- }
-
- else if (!strncasecmp(cmdbuf, "RSET", 4)) {
- pop3_rset(&cmdbuf[5]);
- }
-
- else if (!strncasecmp(cmdbuf, "UIDL", 4)) {
- pop3_uidl(&cmdbuf[5]);
- }
-
- else if (!strncasecmp(cmdbuf, "TOP", 3)) {
- pop3_top(&cmdbuf[4]);
- }
-
- else if (!strncasecmp(cmdbuf, "LAST", 4)) {
- pop3_last(&cmdbuf[4]);
- }
-
- else {
- cprintf("-ERR I'm afraid I can't do that.\r\n");
- }
-
-}
-
-const char *CitadelServicePop3="POP3";
-const char *CitadelServicePop3S="POP3S";
-
-
-CTDL_MODULE_INIT(pop3)
-{
- if(!threading)
- {
- CtdlRegisterServiceHook(CtdlGetConfigInt("c_pop3_port"),
- NULL,
- pop3_greeting,
- pop3_command_loop,
- NULL,
- CitadelServicePop3);
-#ifdef HAVE_OPENSSL
- CtdlRegisterServiceHook(CtdlGetConfigInt("c_pop3s_port"),
- NULL,
- pop3s_greeting,
- pop3_command_loop,
- NULL,
- CitadelServicePop3S);
-#endif
- CtdlRegisterSessionHook(pop3_cleanup_function, EVT_STOP, PRIO_STOP + 30);
- }
-
- /* return our module name for the log */
- return "pop3";
-}
projects / citadel.git / blobdiff