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 "match.h"
  24 #include "hash.h"
  25 #include "ircd.h"
  26 #include "numeric.h"
  27 #include "send.h"
  28 #include "msg.h"
  29 #include "modules.h"
  30 #include "sslproc.h"
  31 #include "s_assert.h"
  32 #include "s_serv.h"
  33 #include "logger.h"
  34
  35 static const char starttls_desc[] = "Provides the tls CAP and STARTTLS command";
  36
  37 static void mr_starttls(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  38
  39 struct Message starttls_msgtab = {
  40         "STARTTLS", 0, 0, 0, 0,
  41         {{mr_starttls, 0}, mg_ignore, mg_ignore, mg_ignore, mg_ignore, mg_ignore}
  42 };
  43
  44 mapi_clist_av1 starttls_clist[] = { &starttls_msgtab, NULL };
  45
  46 unsigned int CLICAP_TLS = 0;
  47
  48 mapi_cap_list_av2 starttls_cap_list[] = {
  49         { MAPI_CAP_CLIENT, "tls", NULL, &CLICAP_TLS },
  50         { 0, NULL, NULL, NULL }
  51 };
  52
  53 DECLARE_MODULE_AV2(starttls, NULL, NULL, starttls_clist, NULL, NULL, starttls_cap_list, NULL, starttls_desc);
  54
  55 static void
  56 mr_starttls(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  57 {
  58         ssl_ctl_t *ctl;
  59         rb_fde_t *F[2];
  60
  61         if (!MyConnect(client_p))
  62                 return;
  63
  64         if (IsSSL(client_p))
  65         {
  66                 sendto_one_numeric(client_p, ERR_STARTTLS, form_str(ERR_STARTTLS), "Nested TLS handshake not allowed");
  67                 return;
  68         }
  69
  70         if (!ircd_ssl_ok || !get_ssld_count())
  71         {
  72                 sendto_one_numeric(client_p, ERR_STARTTLS, form_str(ERR_STARTTLS), "TLS is not configured");
  73                 return;
  74         }
  75
  76         if (rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &F[0], &F[1], "STARTTLS ssld session") == -1)
  77         {
  78                 ilog_error("error creating SSL/TLS socketpair for ssld slave");
  79                 sendto_one_numeric(client_p, ERR_STARTTLS, form_str(ERR_STARTTLS), "Unable to create SSL/TLS socketpair for ssld offload slave");
  80                 return;
  81         }
  82
  83         s_assert(client_p->localClient != NULL);
  84
  85         /* clear out any remaining plaintext lines */
  86         rb_linebuf_donebuf(&client_p->localClient->buf_recvq);
  87
  88         sendto_one_numeric(client_p, RPL_STARTTLS, form_str(RPL_STARTTLS));
  89         send_queued(client_p);
  90
  91         /* TODO: set localClient->ssl_callback and handle success/failure */
  92
  93         ctl = start_ssld_accept(client_p->localClient->F, F[1], connid_get(client_p));
  94         if (ctl != NULL)
  95         {
  96                 client_p->localClient->F = F[0];
  97                 client_p->localClient->ssl_ctl = ctl;
  98                 SetSSL(client_p);
  99         }
 100 }