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