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construct/modules/m_sasl.c
2008-04-20 08:40:40 +04:00

208 lines
6.2 KiB
C

/* modules/m_sasl.c
* Copyright (C) 2006 Michael Tharp <gxti@partiallystapled.com>
* Copyright (C) 2006 charybdis development team
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1.Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2.Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3.The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $Id: m_sasl.c 1409 2006-05-21 14:46:17Z jilles $
*/
#include "stdinc.h"
#include "client.h"
#include "hash.h"
#include "send.h"
#include "msg.h"
#include "modules.h"
#include "numeric.h"
#include "s_serv.h"
#include "s_stats.h"
#include "string.h"
static int mr_authenticate(struct Client *, struct Client *, int, const char **);
static int me_sasl(struct Client *, struct Client *, int, const char **);
static void abort_sasl(struct Client *);
static void abort_sasl_exit(hook_data_client_exit *);
struct Message authenticate_msgtab = {
"AUTHENTICATE", 0, 0, 0, MFLG_SLOW,
{{mr_authenticate, 2}, mg_reg, mg_ignore, mg_ignore, mg_ignore, mg_reg}
};
struct Message sasl_msgtab = {
"SASL", 0, 0, 0, MFLG_SLOW,
{mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_sasl, 5}, mg_ignore}
};
mapi_clist_av1 sasl_clist[] = {
&authenticate_msgtab, &sasl_msgtab, NULL
};
mapi_hfn_list_av1 sasl_hfnlist[] = {
{ "new_local_user", (hookfn) abort_sasl },
{ "client_exit", (hookfn) abort_sasl_exit },
{ NULL, NULL }
};
DECLARE_MODULE_AV1(sasl, NULL, NULL, sasl_clist, NULL, sasl_hfnlist, "$Revision: 1409 $");
static int
mr_authenticate(struct Client *client_p, struct Client *source_p,
int parc, const char *parv[])
{
struct Client *agent_p = NULL;
/* They really should use CAP for their own sake. */
if(!IsCapable(source_p, CLICAP_SASL))
return 0;
if (strlen(client_p->id) == 3)
{
exit_client(client_p, client_p, client_p, "Mixing client and server protocol");
return 0;
}
if(source_p->preClient->sasl_complete)
{
sendto_one(source_p, form_str(ERR_SASLALREADY), me.name, EmptyString(source_p->name) ? "*" : source_p->name);
return 0;
}
if(strlen(parv[1]) > 400)
{
sendto_one(source_p, form_str(ERR_SASLTOOLONG), me.name, EmptyString(source_p->name) ? "*" : source_p->name);
return 0;
}
if(!*source_p->id)
{
/* Allocate a UID. */
strcpy(source_p->id, generate_uid());
add_to_id_hash(source_p->id, source_p);
}
if(*source_p->preClient->sasl_agent)
agent_p = find_id(source_p->preClient->sasl_agent);
if(agent_p == NULL)
sendto_server(NULL, NULL, CAP_TS6|CAP_ENCAP, NOCAPS, ":%s ENCAP * SASL %s * S %s", me.id,
source_p->id, parv[1]);
else
sendto_one(agent_p, ":%s ENCAP %s SASL %s %s C %s", me.id, agent_p->servptr->name,
source_p->id, agent_p->id, parv[1]);
source_p->preClient->sasl_out++;
return 0;
}
static int
me_sasl(struct Client *client_p, struct Client *source_p,
int parc, const char *parv[])
{
struct Client *target_p, *agent_p;
/* Let propagate if not addressed to us, or if broadcast.
* Only SASL agents can answer global requests.
*/
if(strncmp(parv[2], me.id, 3))
return 0;
if((target_p = find_id(parv[2])) == NULL)
return 0;
if(target_p->preClient == NULL)
return 0;
if((agent_p = find_id(parv[1])) == NULL)
return 0;
if(source_p != agent_p->servptr) /* WTF?! */
return 0;
/* We only accept messages from SASL agents; these must have umode +S
* (so the server must be listed in a service{} block).
*/
if(!IsService(agent_p))
return 0;
/* Reject if someone has already answered. */
if(*target_p->preClient->sasl_agent && strncmp(parv[1], target_p->preClient->sasl_agent, IDLEN))
return 0;
else if(!*target_p->preClient->sasl_agent)
rb_strlcpy(target_p->preClient->sasl_agent, parv[1], IDLEN);
if(*parv[3] == 'C')
sendto_one(target_p, "AUTHENTICATE %s", parv[4]);
else if(*parv[3] == 'D')
{
if(*parv[4] == 'F')
sendto_one(target_p, form_str(ERR_SASLFAIL), me.name, EmptyString(target_p->name) ? "*" : target_p->name);
else if(*parv[4] == 'S') {
sendto_one(target_p, form_str(RPL_SASLSUCCESS), me.name, EmptyString(target_p->name) ? "*" : target_p->name);
target_p->preClient->sasl_complete = 1;
ServerStats.is_ssuc++;
}
*target_p->preClient->sasl_agent = '\0'; /* Blank the stored agent so someone else can answer */
}
return 0;
}
/* If the client never finished authenticating but is
* registering anyway, abort the exchange.
*/
static void
abort_sasl(struct Client *data)
{
if(data->preClient->sasl_out == 0 || data->preClient->sasl_complete)
return;
data->preClient->sasl_out = data->preClient->sasl_complete = 0;
ServerStats.is_sbad++;
if(!IsClosing(data))
sendto_one(data, form_str(ERR_SASLABORTED), me.name, EmptyString(data->name) ? "*" : data->name);
if(*data->preClient->sasl_agent)
{
struct Client *agent_p = find_id(data->preClient->sasl_agent);
if(agent_p)
{
sendto_one(agent_p, ":%s ENCAP %s SASL %s %s D A", me.id, agent_p->servptr->name,
data->id, agent_p->id);
return;
}
}
sendto_server(NULL, NULL, CAP_TS6|CAP_ENCAP, NOCAPS, ":%s ENCAP * SASL %s * D A", me.id,
data->id);
}
static void
abort_sasl_exit(hook_data_client_exit *data)
{
if (data->target->preClient)
abort_sasl(data->target);
}