modules/m_starttls.c

   1 /*
   2  * Copyright (c) 2012 William Pitcock <nenolod@dereferenced.org>.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice is present in all copies.
   7  *
   8  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   9  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  10  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  11  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  12  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  13  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  14  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  15  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  16  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  17  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  18  * POSSIBILITY OF SUCH DAMAGE.
  19  */
  20
  21 #include "stdinc.h"
  22 #include "client.h"
  23 #include "common.h"
  24 #include "match.h"
  25 #include "hash.h"
  26 #include "ircd.h"
  27 #include "numeric.h"
  28 #include "send.h"
  29 #include "msg.h"
  30 #include "modules.h"
  31 #include "sslproc.h"
  32
  33 static int mr_starttls(struct Client *, struct Client *, int, const char **);
  34
  35 struct Message starttls_msgtab = {
  36         "STARTTLS", 0, 0, 0, MFLG_SLOW,
  37         {{mr_starttls, 0}, mg_ignore, mg_ignore, mg_ignore, mg_ignore, mg_ignore}
  38 };
  39
  40 mapi_clist_av1 starttls_clist[] = { &starttls_msgtab, NULL };
  41
  42 DECLARE_MODULE_AV1(starttls, NULL, NULL, starttls_clist, NULL, NULL, "$Revision$");
  43
  44 static int
  45 mr_starttls(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  46 {
  47 #ifdef HAVE_LIBCRYPTO
  48         ssl_ctl_t *ctl;
  49         rb_fde_t *F[2];
  50
  51         if (!MyConnect(client_p))
  52                 return 0;
  53
  54         if (!ssl_ok || !get_ssld_count())
  55         {
  56                 sendto_one_numeric(client_p, ERR_STARTTLS, form_str(ERR_STARTTLS), "TLS is not configured");
  57                 return 1;
  58         }
  59
  60         if (rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &F[0], &F[1], "STARTTLS ssld session") == -1)
  61         {
  62                 ilog_error("error creating SSL/TLS socketpair for ssld slave");
  63                 sendto_one_numeric(client_p, ERR_STARTTLS, form_str(ERR_STARTTLS), "Unable to create SSL/TLS socketpair for ssld offload slave");
  64                 return 1;
  65         }
  66
  67         s_assert(client_p->localClient != NULL);
  68
  69         /* clear out any remaining plaintext lines */
  70         rb_linebuf_donebuf(&client_p->localClient->buf_recvq);
  71
  72         sendto_one_numeric(client_p, RPL_STARTTLS, form_str(RPL_STARTTLS));
  73         send_queued(client_p);
  74
  75         ctl = start_ssld_accept(client_p->localClient->F, F[1], rb_get_fd(F[0]));
  76         if (ctl != NULL)
  77         {
  78                 del_from_cli_fd_hash(client_p);
  79                 client_p->localClient->F = F[0];
  80                 add_to_cli_fd_hash(client_p);
  81                 client_p->localClient->ssl_ctl = ctl;
  82                 SetSSL(client_p);
  83         }
  84         else
  85                 return 1;
  86
  87 #else
  88         sendto_one_numeric(client_p, ERR_STARTTLS, form_str(ERR_STARTTLS), "TLS is not configured");
  89 #endif
  90         return 0;
  91 }