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imap-filter.c

#include <sys/types.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <msg/msg.h>
#include <str/str.h>
#include "auth-lib.h"
#include "ucspi-proxy.h"

const char filter_connfail_prefix[] = "* NO ";
const char filter_connfail_suffix[] = "\r\n";

extern const char* local_name;

static str label;
static str saved_label;
static str linebuf;

static int parse_label(void)
{
  int end;
  if ((end = str_findfirst(&linebuf, ' ')) <= 0) return 0;
  str_copyb(&label, linebuf.s, end);
  return end + 1;
}

static void handle_login(int offset)
{
  const char* start;
  const char* end;

  start = linebuf.s + offset;
  while (isspace(*start))
    ++start;
  if (*start == '"') {
    end = ++start;
    while (*end != '"')
      ++end;
  }
  else {
    end = start;
    while (!isspace(*end))
      ++end;
  }
  make_username(start, end - start, "LOGIN ");
  str_splice(&linebuf, start-linebuf.s, end-start, &username);
  str_copy(&saved_label, &label);
  str_truncate(&label, 0);
}

static void filter_client_line(void)
{
  int offset;
  const char* cmd;

  if (!handle_auth_response(&linebuf, 0)) {
    if ((offset = parse_label()) > 0) {
      cmd = linebuf.s + offset;
      /* If we see a "AUTHENTICATE" or "LOGIN" command, save the preceding
       * label for reference when looking for the corresponding "OK" */
      if(!strncasecmp(cmd, "AUTHENTICATE ", 13)) {
      if (handle_auth_parameter(&linebuf, offset + 13))
        str_copy(&saved_label, &label);
      }
      else if (!strncasecmp(cmd, "LOGIN ", 6))
      handle_login(offset + 6);
    }
  }
}

static void filter_client_data(char* data, ssize_t size)
{
  char* lf;
  while ((lf = memchr(data, LF, size)) != 0) {
    str_catb(&linebuf, data, lf - data + 1);
    filter_client_line();
    write_server(linebuf.s, linebuf.len);
    linebuf.len = 0;
    size -= lf - data + 1;
    data = lf + 1;
  }
  str_catb(&linebuf, data, size);
}

static void filter_server_data(char* data, ssize_t size)
{
  if(saved_label.len > 0) {
    /* Skip continuation data */
    if(data[0] != '+') {
      int resp;
      /* Check if the response is tagged with the saved label */
      str_copyb(&linebuf, data, size);
      resp = parse_label();
      if(resp > 0) {
      if(!str_diff(&label, &saved_label)) {
        /* Check if the response was an OK */
        if(!strncasecmp(linebuf.s + resp, "OK ", 3))
          accept_client(username.s);
        else
          deny_client(username.s);
        str_truncate(&saved_label, 0);
      }
      }
    }
  }
  write_client(data, size);
}

void imap_filter_init(void)
{
  set_filter(CLIENT_IN, filter_client_data, 0);
  set_filter(SERVER_FD, filter_server_data, 0);
}

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