[irc/rqf/shadowircd.git] / modules / m_sasl.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.
 *
 */

#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);
}
Commit	Line	Data
212380e3	1	/* modules/m_sasl.c
	2	* Copyright (C) 2006 Michael Tharp <gxti@partiallystapled.com>
	3	* Copyright (C) 2006 charybdis development team
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions are
	7	* met:
	8	*
	9	* 1.Redistributions of source code must retain the above copyright notice,
	10	* this list of conditions and the following disclaimer.
	11	* 2.Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* 3.The name of the author may not be used to endorse or promote products
	15	* derived from this software without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	19	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	20	* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
	21	* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	22	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	23	* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	25	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	26	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	27	* POSSIBILITY OF SUCH DAMAGE.
	28	*
212380e3	29	*/
	30
	31	#include "stdinc.h"
	32
	33	#include "client.h"
	34	#include "hash.h"
	35	#include "send.h"
	36	#include "msg.h"
	37	#include "modules.h"
	38	#include "numeric.h"
	39	#include "s_serv.h"
	40	#include "s_stats.h"
	41	#include "string.h"
	42
	43	static int mr_authenticate(struct Client , struct Client , int, const char **);
	44	static int me_sasl(struct Client , struct Client , int, const char **);
	45
	46	static void abort_sasl(struct Client *);
	47	static void abort_sasl_exit(hook_data_client_exit *);
	48
	49	struct Message authenticate_msgtab = {
	50	"AUTHENTICATE", 0, 0, 0, MFLG_SLOW,
	51	{{mr_authenticate, 2}, mg_reg, mg_ignore, mg_ignore, mg_ignore, mg_reg}
	52	};
	53	struct Message sasl_msgtab = {
	54	"SASL", 0, 0, 0, MFLG_SLOW,
	55	{mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_sasl, 5}, mg_ignore}
	56	};
	57
	58	mapi_clist_av1 sasl_clist[] = {
	59	&authenticate_msgtab, &sasl_msgtab, NULL
	60	};
	61	mapi_hfn_list_av1 sasl_hfnlist[] = {
	62	{ "new_local_user", (hookfn) abort_sasl },
	63	{ "client_exit", (hookfn) abort_sasl_exit },
	64	{ NULL, NULL }
	65	};
	66
	67	DECLARE_MODULE_AV1(sasl, NULL, NULL, sasl_clist, NULL, sasl_hfnlist, "$Revision: 1409 $");
	68
	69	static int
	70	mr_authenticate(struct Client client_p, struct Client source_p,
	71	int parc, const char *parv[])
	72	{
	73	struct Client *agent_p = NULL;
	74
	75	/* They really should use CAP for their own sake. */
	76	if(!IsCapable(source_p, CLICAP_SASL))
	77	return 0;
	78
	79	if (strlen(client_p->id) == 3)
	80	{
	81	exit_client(client_p, client_p, client_p, "Mixing client and server protocol");
	82	return 0;
	83	}
	84
	85	if(source_p->preClient->sasl_complete)
	86	{
	87	sendto_one(source_p, form_str(ERR_SASLALREADY), me.name, EmptyString(source_p->name) ? "*" : source_p->name);
	88	return 0;
	89	}
	90
	91	if(strlen(parv[1]) > 400)
	92	{
93	sendto_one(source_p, form_str(ERR_SASLTOOLONG), me.name, EmptyString(source_p->name) ? "*" : source_p->name);
94	return 0;
95	}
96
97	if(!*source_p->id)
98	{
99	/* Allocate a UID. */
100	strcpy(source_p->id, generate_uid());
101	add_to_id_hash(source_p->id, source_p);
102	}
103
104	if(*source_p->preClient->sasl_agent)
105	agent_p = find_id(source_p->preClient->sasl_agent);
106
107	if(agent_p == NULL)
108	sendto_server(NULL, NULL, CAP_TS6\|CAP_ENCAP, NOCAPS, ":%s ENCAP * SASL %s * S %s", me.id,
109	source_p->id, parv[1]);
110	else
111	sendto_one(agent_p, ":%s ENCAP %s SASL %s %s C %s", me.id, agent_p->servptr->name,
112	source_p->id, agent_p->id, parv[1]);
113	source_p->preClient->sasl_out++;
114
115	return 0;
116	}
117
118	static int
119	me_sasl(struct Client client_p, struct Client source_p,
120	int parc, const char *parv[])
121	{
122	struct Client target_p, agent_p;
123
124	/* Let propagate if not addressed to us, or if broadcast.
125	* Only SASL agents can answer global requests.
126	*/
127	if(strncmp(parv[2], me.id, 3))
128	return 0;
129
130	if((target_p = find_id(parv[2])) == NULL)
131	return 0;
132
133	if(target_p->preClient == NULL)
134	return 0;
135
136	if((agent_p = find_id(parv[1])) == NULL)
137	return 0;
138
139	if(source_p != agent_p->servptr) /* WTF?! */
140	return 0;
141
142	/* We only accept messages from SASL agents; these must have umode +S
143	* (so the server must be listed in a service{} block).
144	*/
145	if(!IsService(agent_p))
146	return 0;
147
148	/* Reject if someone has already answered. */
149	if(*target_p->preClient->sasl_agent && strncmp(parv[1], target_p->preClient->sasl_agent, IDLEN))
150	return 0;
151	else if(!*target_p->preClient->sasl_agent)
907468c4	152	rb_strlcpy(target_p->preClient->sasl_agent, parv[1], IDLEN);
212380e3	153
	154	if(*parv[3] == 'C')
	155	sendto_one(target_p, "AUTHENTICATE %s", parv[4]);
	156	else if(*parv[3] == 'D')
	157	{
	158	if(*parv[4] == 'F')
	159	sendto_one(target_p, form_str(ERR_SASLFAIL), me.name, EmptyString(target_p->name) ? "*" : target_p->name);
	160	else if(*parv[4] == 'S') {
	161	sendto_one(target_p, form_str(RPL_SASLSUCCESS), me.name, EmptyString(target_p->name) ? "*" : target_p->name);
	162	target_p->preClient->sasl_complete = 1;
83251205	163	ServerStats.is_ssuc++;
212380e3	164	}
	165	target_p->preClient->sasl_agent = '\0'; / Blank the stored agent so someone else can answer */
	166	}
	167
	168	return 0;
	169	}
	170
	171	/* If the client never finished authenticating but is
	172	* registering anyway, abort the exchange.
	173	*/
	174	static void
	175	abort_sasl(struct Client *data)
	176	{
	177	if(data->preClient->sasl_out == 0 \|\| data->preClient->sasl_complete)
	178	return;
	179
	180	data->preClient->sasl_out = data->preClient->sasl_complete = 0;
83251205	181	ServerStats.is_sbad++;
212380e3	182
	183	if(!IsClosing(data))
	184	sendto_one(data, form_str(ERR_SASLABORTED), me.name, EmptyString(data->name) ? "*" : data->name);
	185
	186	if(*data->preClient->sasl_agent)
	187	{
	188	struct Client *agent_p = find_id(data->preClient->sasl_agent);
	189	if(agent_p)
	190	{
	191	sendto_one(agent_p, ":%s ENCAP %s SASL %s %s D A", me.id, agent_p->servptr->name,
	192	data->id, agent_p->id);
	193	return;
	194	}
	195	}
	196
	197	sendto_server(NULL, NULL, CAP_TS6\|CAP_ENCAP, NOCAPS, ":%s ENCAP * SASL %s * D A", me.id,
	198	data->id);
	199	}
	200
	201	static void
	202	abort_sasl_exit(hook_data_client_exit *data)
	203	{
	204	if (data->target->preClient)
	205	abort_sasl(data->target);
	206	}
	207