solanum/ircd/authproc.c

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/*
* authd.c: An interface to authd.
* (based somewhat on ircd-ratbox dns.c)
*
* Copyright (C) 2005 Aaron Sethman <androsyn@ratbox.org>
* Copyright (C) 2005-2012 ircd-ratbox development team
* Copyright (C) 2016 Ariadne Conill <ariadne@dereferenced.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#include "stdinc.h"
#include "rb_lib.h"
#include "client.h"
#include "ircd_defs.h"
#include "parse.h"
#include "authproc.h"
#include "match.h"
#include "logger.h"
#include "s_conf.h"
#include "s_stats.h"
#include "client.h"
#include "packet.h"
#include "hash.h"
#include "send.h"
#include "numeric.h"
#include "msg.h"
#include "dns.h"
typedef void (*authd_cb_t)(int, char **);
struct authd_cb
{
authd_cb_t fn;
int min_parc;
};
static int start_authd(void);
static void parse_authd_reply(rb_helper * helper);
static void restart_authd_cb(rb_helper * helper);
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static EVH timeout_dead_authd_clients;
static void cmd_accept_client(int parc, char **parv);
static void cmd_reject_client(int parc, char **parv);
static void cmd_dns_result(int parc, char **parv);
static void cmd_notice_client(int parc, char **parv);
static void cmd_oper_warn(int parc, char **parv);
static void cmd_stats_results(int parc, char **parv);
rb_helper *authd_helper;
static char *authd_path;
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uint32_t cid;
static rb_dictionary *cid_clients;
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static struct ev_entry *timeout_ev;
rb_dictionary *dnsbl_stats;
rb_dlink_list opm_list;
struct OPMListener opm_listeners[LISTEN_LAST];
static struct authd_cb authd_cmd_tab[256] =
{
['A'] = { cmd_accept_client, 4 },
['E'] = { cmd_dns_result, 5 },
['N'] = { cmd_notice_client, 3 },
['R'] = { cmd_reject_client, 7 },
['W'] = { cmd_oper_warn, 3 },
['X'] = { cmd_stats_results, 3 },
['Y'] = { cmd_stats_results, 3 },
['Z'] = { cmd_stats_results, 3 },
};
static int
start_authd(void)
{
char fullpath[PATH_MAX + 1];
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if(authd_path == NULL)
{
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snprintf(fullpath, sizeof(fullpath), "%s/authd", ircd_paths[IRCD_PATH_LIBEXEC]);
if(access(fullpath, X_OK) == -1)
{
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snprintf(fullpath, sizeof(fullpath), "%s/bin/authd", ConfigFileEntry.dpath);
if(access(fullpath, X_OK) == -1)
{
ierror("Unable to execute authd in %s or %s/bin",
ircd_paths[IRCD_PATH_LIBEXEC], ConfigFileEntry.dpath);
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Unable to execute authd in %s or %s/bin",
ircd_paths[IRCD_PATH_LIBEXEC], ConfigFileEntry.dpath);
return 1;
}
}
authd_path = rb_strdup(fullpath);
}
if(cid_clients == NULL)
cid_clients = rb_dictionary_create("authd cid to uid mapping", rb_uint32cmp);
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if(timeout_ev == NULL)
timeout_ev = rb_event_addish("timeout_dead_authd_clients", timeout_dead_authd_clients, NULL, 1);
authd_helper = rb_helper_start("authd", authd_path, parse_authd_reply, restart_authd_cb);
if(authd_helper == NULL)
{
ierror("Unable to start authd helper: %s", strerror(errno));
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "Unable to start authd helper: %s", strerror(errno));
return 1;
}
ilog(L_MAIN, "authd helper started");
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "authd helper started");
rb_helper_run(authd_helper);
return 0;
}
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static inline uint32_t
str_to_cid(const char *str)
{
long lcid = strtol(str, NULL, 16);
if(lcid > UINT32_MAX || lcid <= 0)
{
iwarn("authd sent us back a bad client ID: %lx", lcid);
restart_authd();
return 0;
}
return (uint32_t)lcid;
}
static inline struct Client *
cid_to_client(uint32_t ncid, bool del)
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{
struct Client *client_p;
if(del)
client_p = rb_dictionary_delete(cid_clients, RB_UINT_TO_POINTER(ncid));
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else
client_p = rb_dictionary_retrieve(cid_clients, RB_UINT_TO_POINTER(ncid));
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/* If the client's not found, that's okay, it may have already gone away.
* --Elizafox */
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return client_p;
}
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static inline struct Client *
str_cid_to_client(const char *str, bool del)
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{
uint32_t ncid = str_to_cid(str);
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if(ncid == 0)
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return NULL;
return cid_to_client(ncid, del);
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}
static void
cmd_accept_client(int parc, char **parv)
{
struct Client *client_p;
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/* cid to uid (retrieve and delete) */
if((client_p = str_cid_to_client(parv[1], true)) == NULL)
return;
authd_accept_client(client_p, parv[2], parv[3]);
}
static void
cmd_dns_result(int parc, char **parv)
{
dns_results_callback(parv[1], parv[2], parv[3], parv[4]);
}
static void
cmd_notice_client(int parc, char **parv)
{
struct Client *client_p;
if ((client_p = str_cid_to_client(parv[1], false)) == NULL)
return;
if (IsAnyDead(client_p))
return;
sendto_one_notice(client_p, ":%s", parv[2]);
}
static void
cmd_reject_client(int parc, char **parv)
{
struct Client *client_p;
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/* cid to uid (retrieve and delete) */
if((client_p = str_cid_to_client(parv[1], true)) == NULL)
return;
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authd_reject_client(client_p, parv[3], parv[4], toupper(*parv[2]), parv[5], parv[6]);
}
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static void
cmd_oper_warn(int parc, char **parv)
{
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switch(*parv[1])
{
case 'D': /* Debug */
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sendto_realops_snomask(SNO_DEBUG, L_ALL, "authd debug: %s", parv[2]);
idebug("authd: %s", parv[2]);
break;
case 'I': /* Info */
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sendto_realops_snomask(SNO_GENERAL, L_ALL, "authd info: %s", parv[2]);
inotice("authd: %s", parv[2]);
break;
case 'W': /* Warning */
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sendto_realops_snomask(SNO_GENERAL, L_ALL, "authd WARNING: %s", parv[2]);
iwarn("authd: %s", parv[2]);
break;
case 'C': /* Critical (error) */
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sendto_realops_snomask(SNO_GENERAL, L_ALL, "authd CRITICAL: %s", parv[2]);
ierror("authd: %s", parv[2]);
break;
default: /* idk */
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sendto_realops_snomask(SNO_GENERAL, L_ALL, "authd sent us an unknown oper notice type (%s): %s", parv[1], parv[2]);
ilog(L_MAIN, "authd unknown oper notice type (%s): %s", parv[1], parv[2]);
break;
}
}
static void
cmd_stats_results(int parc, char **parv)
{
/* Select by type */
switch(*parv[2])
{
case 'D':
/* parv[0] conveys status */
if(parc < 4)
{
iwarn("authd sent a result with wrong number of arguments: got %d", parc);
restart_authd();
return;
}
dns_stats_results_callback(parv[1], parv[0], parc - 3, (const char **)&parv[3]);
break;
default:
break;
}
}
static void
parse_authd_reply(rb_helper * helper)
{
ssize_t len;
int parc;
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char buf[READBUF_SIZE];
char *parv[MAXPARA];
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while((len = rb_helper_read(helper, buf, sizeof(buf))) > 0)
{
struct authd_cb *cmd;
parc = rb_string_to_array(buf, parv, sizeof(parv));
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cmd = &authd_cmd_tab[(unsigned char)*parv[0]];
if(cmd->fn != NULL)
{
if(cmd->min_parc > parc)
{
iwarn("authd sent a result with wrong number of arguments: expected %d, got %d",
cmd->min_parc, parc);
restart_authd();
continue;
}
cmd->fn(parc, parv);
}
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else
{
iwarn("authd sent us a bad command type: %c", *parv[0]);
restart_authd();
continue;
}
}
}
void
init_authd(void)
{
if(start_authd())
{
ierror("Unable to start authd helper: %s", strerror(errno));
exit(0);
}
}
void
configure_authd(void)
{
/* Timeouts */
set_authd_timeout("ident_timeout", GlobalSetOptions.ident_timeout);
set_authd_timeout("rdns_timeout", ConfigFileEntry.connect_timeout);
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set_authd_timeout("rbl_timeout", ConfigFileEntry.connect_timeout);
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ident_check_enable(!ConfigFileEntry.disable_auth);
/* Configure OPM */
if(rb_dlink_list_length(&opm_list) > 0 &&
(opm_listeners[LISTEN_IPV4].ipaddr[0] != '\0' ||
opm_listeners[LISTEN_IPV6].ipaddr[0] != '\0'))
{
rb_dlink_node *ptr;
if(opm_listeners[LISTEN_IPV4].ipaddr[0] != '\0')
rb_helper_write(authd_helper, "O opm_listener %s %hu",
opm_listeners[LISTEN_IPV4].ipaddr, opm_listeners[LISTEN_IPV4].port);
if(opm_listeners[LISTEN_IPV6].ipaddr[0] != '\0')
rb_helper_write(authd_helper, "O opm_listener %s %hu",
opm_listeners[LISTEN_IPV6].ipaddr, opm_listeners[LISTEN_IPV6].port);
RB_DLINK_FOREACH(ptr, opm_list.head)
{
struct OPMScanner *scanner = ptr->data;
rb_helper_write(authd_helper, "O opm_scanner %s %hu",
scanner->type, scanner->port);
}
opm_check_enable(true);
}
else
opm_check_enable(false);
}
static void
authd_free_client(struct Client *client_p)
{
if(client_p == NULL || client_p->preClient == NULL)
return;
if(client_p->preClient->auth.cid == 0)
return;
if(authd_helper != NULL)
rb_helper_write(authd_helper, "E %x", client_p->preClient->auth.cid);
client_p->preClient->auth.accepted = true;
client_p->preClient->auth.cid = 0;
}
static void
authd_free_client_cb(rb_dictionary_element *delem, void *unused)
{
struct Client *client_p = delem->data;
authd_free_client(client_p);
}
void
authd_abort_client(struct Client *client_p)
{
rb_dictionary_delete(cid_clients, RB_UINT_TO_POINTER(client_p->preClient->auth.cid));
authd_free_client(client_p);
}
static void
restart_authd_cb(rb_helper * helper)
{
iwarn("authd: restart_authd_cb called, authd died?");
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sendto_realops_snomask(SNO_GENERAL, L_ALL, "authd: restart_authd_cb called, authd died?");
if(helper != NULL)
{
rb_helper_close(helper);
authd_helper = NULL;
}
rb_dictionary_destroy(cid_clients, authd_free_client_cb, NULL);
cid_clients = NULL;
start_authd();
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configure_authd();
}
void
restart_authd(void)
{
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ierror("authd restarting...");
restart_authd_cb(authd_helper);
}
void
rehash_authd(void)
{
rb_helper_write(authd_helper, "R");
}
void
check_authd(void)
{
if(authd_helper == NULL)
restart_authd();
}
static inline uint32_t
generate_cid(void)
{
if(++cid == 0)
cid = 1;
return cid;
}
/* Basically when this is called we begin handing off the client to authd for
* processing. authd "owns" the client until processing is finished, or we
* timeout from authd. authd will make a decision whether or not to accept the
* client, but it's up to other parts of the code (for now) to decide if we're
* gonna accept the client and ignore authd's suggestion.
*
* --Elizafox
*
* If this is an SSL connection we must defer handing off the client for
* reading until it is open and we have the certificate fingerprint, otherwise
* it's possible for the client to immediately send data before authd completes
* and before the status of the connection is communicated via ssld. This data
* could then be processed too early by read_packet().
*/
void
authd_initiate_client(struct Client *client_p, bool defer)
{
char client_ipaddr[HOSTIPLEN+1];
char listen_ipaddr[HOSTIPLEN+1];
uint16_t client_port, listen_port;
uint32_t authd_cid;
if(client_p->preClient == NULL || client_p->preClient->auth.cid != 0)
return;
authd_cid = client_p->preClient->auth.cid = generate_cid();
/* Collisions are extremely unlikely, so disregard the possibility */
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rb_dictionary_add(cid_clients, RB_UINT_TO_POINTER(authd_cid), client_p);
/* Retrieve listener and client IP's */
rb_inet_ntop_sock((struct sockaddr *)&client_p->preClient->lip, listen_ipaddr, sizeof(listen_ipaddr));
rb_inet_ntop_sock((struct sockaddr *)&client_p->localClient->ip, client_ipaddr, sizeof(client_ipaddr));
/* Retrieve listener and client ports */
listen_port = ntohs(GET_SS_PORT(&client_p->preClient->lip));
client_port = ntohs(GET_SS_PORT(&client_p->localClient->ip));
if(defer)
client_p->preClient->auth.flags |= AUTHC_F_DEFERRED;
/* Add a bit of a fudge factor... */
client_p->preClient->auth.timeout = rb_current_time() + ConfigFileEntry.connect_timeout + 10;
rb_helper_write(authd_helper, "C %x %s %hu %s %hu %x", authd_cid, listen_ipaddr, listen_port, client_ipaddr, client_port,
#ifdef HAVE_LIBSCTP
IsSCTP(client_p) ? IPPROTO_SCTP : IPPROTO_TCP);
#else
IPPROTO_TCP);
#endif
}
static inline void
authd_read_client(struct Client *client_p)
{
/*
* When a client has auth'ed, we want to start reading what it sends
* us. This is what read_packet() does.
* -- adrian
*
* Above comment was originally in s_auth.c, but moved here with below code.
* --Elizafox
*/
rb_dlinkAddTail(client_p, &client_p->node, &global_client_list);
read_packet(client_p->localClient->F, client_p);
}
/* When this is called we have a decision on client acceptance.
*
* After this point authd no longer "owns" the client, but if
* it's flagged as deferred then we're still waiting for a call
* to authd_deferred_client().
*/
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static inline void
authd_decide_client(struct Client *client_p, const char *ident, const char *host, bool accept, char cause, const char *data, const char *reason)
{
if(client_p->preClient == NULL || client_p->preClient->auth.cid == 0)
return;
if(*ident != '*')
{
rb_strlcpy(client_p->username, ident, sizeof(client_p->username));
SetGotId(client_p);
ServerStats.is_asuc++;
}
else
ServerStats.is_abad++; /* s_auth used to do this, stay compatible */
if(*host != '*')
rb_strlcpy(client_p->host, host, sizeof(client_p->host));
rb_dictionary_delete(cid_clients, RB_UINT_TO_POINTER(client_p->preClient->auth.cid));
client_p->preClient->auth.accepted = accept;
client_p->preClient->auth.cause = cause;
client_p->preClient->auth.data = (data == NULL ? NULL : rb_strdup(data));
client_p->preClient->auth.reason = (reason == NULL ? NULL : rb_strdup(reason));
client_p->preClient->auth.cid = 0;
client_p->preClient->auth.flags |= AUTHC_F_COMPLETE;
if((client_p->preClient->auth.flags & AUTHC_F_DEFERRED) == 0)
authd_read_client(client_p);
}
void
authd_deferred_client(struct Client *client_p)
{
client_p->preClient->auth.flags &= ~AUTHC_F_DEFERRED;
if(client_p->preClient->auth.flags & AUTHC_F_COMPLETE)
authd_read_client(client_p);
}
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/* Convenience function to accept client */
void
authd_accept_client(struct Client *client_p, const char *ident, const char *host)
{
authd_decide_client(client_p, ident, host, true, '\0', NULL, NULL);
}
/* Convenience function to reject client */
void
authd_reject_client(struct Client *client_p, const char *ident, const char *host, char cause, const char *data, const char *reason)
{
authd_decide_client(client_p, ident, host, false, cause, data, reason);
}
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static void
timeout_dead_authd_clients(void *notused __unused)
{
rb_dictionary_iter iter;
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struct Client *client_p;
rb_dlink_list freelist = { NULL, NULL, 0 };
rb_dlink_node *ptr, *nptr;
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RB_DICTIONARY_FOREACH(client_p, &iter, cid_clients)
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{
if(client_p->preClient->auth.timeout < rb_current_time())
{
authd_free_client(client_p);
rb_dlinkAddAlloc(client_p, &freelist);
}
}
/* RB_DICTIONARY_FOREACH is not safe for deletion, so we do this crap */
RB_DLINK_FOREACH_SAFE(ptr, nptr, freelist.head)
{
client_p = ptr->data;
rb_dictionary_delete(cid_clients, RB_UINT_TO_POINTER(client_p->preClient->auth.cid));
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}
}
/* Send a new DNSBL entry to authd */
void
add_dnsbl_entry(const char *host, const char *reason, uint8_t iptype, rb_dlink_list *filters)
{
rb_dlink_node *ptr;
struct DNSBLEntryStats *stats = rb_malloc(sizeof(*stats));
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char filterbuf[BUFSIZE] = "*";
size_t s = 0;
if(dnsbl_stats == NULL)
dnsbl_stats = rb_dictionary_create("dnsbl statistics", rb_strcasecmp);
/* Build a list of comma-separated values for authd.
* We don't check for validity - do it elsewhere.
*/
RB_DLINK_FOREACH(ptr, filters->head)
{
char *filter = ptr->data;
size_t filterlen = strlen(filter) + 1;
if(s + filterlen > sizeof(filterbuf))
break;
snprintf(&filterbuf[s], sizeof(filterbuf) - s, "%s,", filter);
s += filterlen;
}
if(s)
filterbuf[s - 1] = '\0';
stats->host = rb_strdup(host);
stats->iptype = iptype;
stats->hits = 0;
rb_dictionary_add(dnsbl_stats, stats->host, stats);
rb_helper_write(authd_helper, "O rbl %s %hhu %s :%s", host, iptype, filterbuf, reason);
}
/* Delete a DNSBL entry. */
void
del_dnsbl_entry(const char *host)
{
struct DNSBLEntryStats *stats = rb_dictionary_retrieve(dnsbl_stats, host);
if(stats != NULL)
{
rb_dictionary_delete(dnsbl_stats, host);
rb_free(stats->host);
rb_free(stats);
}
rb_helper_write(authd_helper, "O rbl_del %s", host);
}
static void
dnsbl_delete_elem(rb_dictionary_element *delem, void *unused)
{
struct DNSBLEntryStats *stats = delem->data;
rb_free(stats->host);
rb_free(stats);
}
/* Delete all the DNSBL entries. */
void
del_dnsbl_entry_all(void)
{
if(dnsbl_stats != NULL)
rb_dictionary_destroy(dnsbl_stats, dnsbl_delete_elem, NULL);
dnsbl_stats = NULL;
rb_helper_write(authd_helper, "O rbl_del_all");
}
/* Adjust an authd timeout value */
bool
set_authd_timeout(const char *key, int timeout)
{
if(timeout <= 0)
return false;
rb_helper_write(authd_helper, "O %s %d", key, timeout);
return true;
}
/* Enable identd checks */
void
ident_check_enable(bool enabled)
{
rb_helper_write(authd_helper, "O ident_enabled %d", enabled ? 1 : 0);
}
/* Create an OPM listener
* XXX - This is a big nasty hack, but it avoids resending duplicate data when
* configure_authd() is called.
*/
void
conf_create_opm_listener(const char *ip, uint16_t port)
{
char ipbuf[HOSTIPLEN];
struct OPMListener *listener;
rb_strlcpy(ipbuf, ip, sizeof(ipbuf));
if(ipbuf[0] == ':')
{
memmove(ipbuf + 1, ipbuf, sizeof(ipbuf) - 1);
ipbuf[0] = '0';
}
/* I am much too lazy to use rb_inet_pton and GET_SS_FAMILY for now --Elizafox */
listener = &opm_listeners[(strchr(ipbuf, ':') != NULL ? LISTEN_IPV6 : LISTEN_IPV4)];
rb_strlcpy(listener->ipaddr, ipbuf, sizeof(listener->ipaddr));
listener->port = port;
}
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void
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create_opm_listener(const char *ip, uint16_t port)
{
char ipbuf[HOSTIPLEN];
/* XXX duplicated in conf_create_opm_listener */
rb_strlcpy(ipbuf, ip, sizeof(ipbuf));
if(ipbuf[0] == ':')
{
memmove(ipbuf + 1, ipbuf, sizeof(ipbuf) - 1);
ipbuf[0] = '0';
}
conf_create_opm_listener(ip, port);
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rb_helper_write(authd_helper, "O opm_listener %s %hu", ipbuf, port);
}
void
delete_opm_listener_all(void)
{
memset(&opm_listeners, 0, sizeof(opm_listeners));
rb_helper_write(authd_helper, "O opm_listener_del_all");
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}
/* Disable all OPM scans */
void
opm_check_enable(bool enabled)
{
rb_helper_write(authd_helper, "O opm_enabled %d", enabled ? 1 : 0);
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}
/* Create an OPM proxy scanner
* XXX - This is a big nasty hack, but it avoids resending duplicate data when
* configure_authd() is called.
*/
void
conf_create_opm_proxy_scanner(const char *type, uint16_t port)
{
struct OPMScanner *scanner = rb_malloc(sizeof(struct OPMScanner));
rb_strlcpy(scanner->type, type, sizeof(scanner->type));
scanner->port = port;
rb_dlinkAdd(scanner, &scanner->node, &opm_list);
}
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void
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create_opm_proxy_scanner(const char *type, uint16_t port)
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{
conf_create_opm_proxy_scanner(type, port);
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rb_helper_write(authd_helper, "O opm_scanner %s %hu", type, port);
}
void
delete_opm_proxy_scanner(const char *type, uint16_t port)
{
rb_dlink_node *ptr, *nptr;
RB_DLINK_FOREACH_SAFE(ptr, nptr, opm_list.head)
{
struct OPMScanner *scanner = ptr->data;
if(rb_strncasecmp(scanner->type, type, sizeof(scanner->type)) == 0 &&
scanner->port == port)
{
rb_dlinkDelete(ptr, &opm_list);
rb_free(scanner);
break;
}
}
rb_helper_write(authd_helper, "O opm_scanner_del %s %hu", type, port);
}
void
delete_opm_proxy_scanner_all(void)
{
rb_dlink_node *ptr, *nptr;
RB_DLINK_FOREACH_SAFE(ptr, nptr, opm_list.head)
{
struct OPMScanner *scanner = ptr->data;
rb_dlinkDelete(ptr, &opm_list);
rb_free(scanner);
}
rb_helper_write(authd_helper, "O opm_scanner_del_all");
}