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Add support for multiple forms of blacklist queries using matches.

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It supports both literal and last octet matches from the dnsbl.
If matches is not present, the old behaviour is used.
This commit is contained in:
Elizabeth Myers 2013-04-20 16:17:29 -05:00
parent 543a10c338
commit 3c93d380e0
5 changed files with 219 additions and 21 deletions
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11
doc/example.conf
View file

@ -388,6 +388,14 @@ serverhide {
* IPv4 is currently the default as few blacklists support IPv6 operation
* as of this writing.
*
* As of charybdis 3.5, a matches parameter is allowed; if omitted, any result
* is considered a match. If included, a comma-separated list of *quoted*
* strings is allowed to match queries. They may be of the format "0" to "255"
* to match the final octet (e.g. 127.0.0.1) or "127.x.y.z" to explicitly match
* an A record. The blacklist is only applied if it matches anything in the
* list. You may freely mix full IP's and final octets. Consult your blacklist
* provider for the meaning of these parameters.
*
* Note: AHBL (the providers of the below *.ahbl.org BLs) request that they be
* contacted, via email, at admins@2mbit.com before using these BLs.
* See <http://www.ahbl.org/services.php> for more information.
@ -405,9 +413,10 @@ blacklist {
# type = ipv4;
# reject_reason = "${nick}, your IP (${ip}) is listed as a TOR exit node. In order to protect ${network-name} from tor-based abuse, we are not allowing TOR exit nodes to connect to our network.";
#
/* Example of a blacklist that supports both IPv4 and IPv6 */
/* Example of a blacklist that supports both IPv4 and IPv6 and using matches */
# host = "foobl.blacklist.invalid";
# type = ipv4, ipv6;
# matches = "4", "6", "127.0.0.10";
# reject_reason = "${nick}, your IP (${ip}) is listed in ${dnsbl-host} for some reason. In order to protect ${network-name} from abuse, we are not allowing connections listed in ${dnsbl-host} to connect";
};

11
doc/reference.conf
View file

@ -843,6 +843,14 @@ serverhide {
* IPv4 is currently the default as few blacklists support IPv6 operation
* as of this writing.
*
* As of charybdis 3.5, a matches parameter is allowed; if omitted, any result
* is considered a match. If included, a comma-separated list of *quoted*
* strings is allowed to match queries. They may be of the format "0" to "255"
* to match the final octet (e.g. 127.0.0.1) or "127.x.y.z" to explicitly match
* an A record. The blacklist is only applied if it matches anything in the
* list. You may freely mix full IP's and final octets. Consult your blacklist
* provider for the meaning of these parameters.
*
* Note: AHBL (the providers of the below *.ahbl.org BLs) request that they be
* contacted, via email, at admins@2mbit.com before using these BLs.
* See <http://www.ahbl.org/services.php> for more information.
@ -860,8 +868,9 @@ blacklist {
# type = ipv4;
# reject_reason = "${nick}, your IP (${ip}) is listed as a TOR exit node. In order to protect ${network-name} from tor-based abuse, we are not allowing TOR exit nodes to connect to our network.";
#
/* Example of a blacklist that supports both IPv4 and IPv6 */
/* Example of a blacklist that supports both IPv4 and IPv6 and using matches */
# host = "foobl.blacklist.invalid";
# matches = "4", "6", "127.0.0.10";
# type = ipv4, ipv6;
# reject_reason = "${nick}, your IP (${ip}) is listed in ${dnsbl-host} for some reason. In order to protect ${network-name} from abuse, we are not allowing connections listed in ${dnsbl-host} to connect";
};

15
include/blacklist.h
View file

@ -24,6 +24,11 @@
#ifndef _BLACKLIST_H_
#define _BLACKLIST_H_
#include "stdinc.h"
#define BLACKLIST_FILTER_ALL 1
#define BLACKLIST_FILTER_LAST 2
/* A configured DNSBL */
struct Blacklist {
unsigned int status; /* If CONF_ILLEGAL, delete when no clients */
@ -31,6 +36,7 @@ struct Blacklist {
int ipv4; /* Does this blacklist support IPv4 lookups? */
int ipv6; /* Does this blacklist support IPv6 lookups? */
char host[IRCD_RES_HOSTLEN + 1];
rb_dlink_list filters; /* Filters for queries */
char reject_reason[IRCD_BUFSIZE];
unsigned int hits;
time_t lastwarning;
@ -44,8 +50,15 @@ struct BlacklistClient {
rb_dlink_node node;
};
/* A blacklist filter */
struct BlacklistFilter {
int type; /* Type of filter */
char filterstr[HOSTIPLEN]; /* The filter itself */
rb_dlink_node node;
};
/* public interfaces */
struct Blacklist *new_blacklist(char *host, char *reject_reason, int ipv4, int ipv6);
struct Blacklist *new_blacklist(char *host, char *reject_reason, int ipv4, int ipv6, rb_dlink_list *filters);
void lookup_blacklists(struct Client *client_p);
void abort_blacklist_queries(struct Client *client_p);
void unref_blacklist(struct Blacklist *blptr);

83
src/blacklist.c
View file

@ -59,6 +59,64 @@ static struct Blacklist *find_blacklist(char *name)
return NULL;
}
static inline int blacklist_check_reply(struct BlacklistClient *blcptr, struct rb_sockaddr_storage *addr)
{
struct Blacklist *blptr = blcptr->blacklist;
char ipaddr[HOSTIPLEN];
char *lastoctet;
rb_dlink_node *ptr;
/* XXX the below two checks might want to change at some point
* e.g. if IPv6 blacklists don't use 127.x.y.z or A records anymore
* --Elizabeth
*/
if (addr->ss_family != AF_INET ||
memcmp(&((struct sockaddr_in *)addr)->sin_addr, "\177", 1))
goto blwarn;
/* No filters and entry found - thus positive match */
if (!rb_dlink_list_length(&blptr->filters))
return 1;
rb_inet_ntop_sock((struct sockaddr *)addr, ipaddr, sizeof(ipaddr));
/* Below will prolly have to change too if the above changes */
if ((lastoctet = strrchr(ipaddr, '.')) == NULL || *(++lastoctet) == '\0')
goto blwarn;
RB_DLINK_FOREACH(ptr, blcptr->blacklist->filters.head)
{
struct BlacklistFilter *filter = ptr->data;
char *cmpstr;
if (filter->type == BLACKLIST_FILTER_ALL)
cmpstr = ipaddr;
else if (filter->type == BLACKLIST_FILTER_LAST)
cmpstr = lastoctet;
else
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"blacklist_check_reply(): Unknown filtertype (BUG!)");
continue;
}
if (strcmp(cmpstr, filter->filterstr) == 0)
/* Match! */
return 1;
}
return 0;
blwarn:
if (blcptr->blacklist->lastwarning + 3600 < rb_current_time())
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Garbage reply from blacklist %s",
blcptr->blacklist->host);
blcptr->blacklist->lastwarning = rb_current_time();
}
return 0;
}
static void blacklist_dns_callback(void *vptr, struct DNSReply *reply)
{
struct BlacklistClient *blcptr = (struct BlacklistClient *) vptr;
@ -77,17 +135,8 @@ static void blacklist_dns_callback(void *vptr, struct DNSReply *reply)
if (reply != NULL)
{
/* only accept 127.x.y.z as a listing */
if (reply->addr.ss_family == AF_INET &&
!memcmp(&((struct sockaddr_in *)&reply->addr)->sin_addr, "\177", 1))
if (blacklist_check_reply(blcptr, &reply->addr))
listed = TRUE;
else if (blcptr->blacklist->lastwarning + 3600 < rb_current_time())
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Garbage reply from blacklist %s",
blcptr->blacklist->host);
blcptr->blacklist->lastwarning = rb_current_time();
}
}
/* they have a blacklist entry for this client */
@ -180,7 +229,7 @@ static void initiate_blacklist_dnsquery(struct Blacklist *blptr, struct Client *
}
/* public interfaces */
struct Blacklist *new_blacklist(char *name, char *reject_reason, int ipv4, int ipv6)
struct Blacklist *new_blacklist(char *name, char *reject_reason, int ipv4, int ipv6, rb_dlink_list *filters)
{
struct Blacklist *blptr;
@ -195,10 +244,14 @@ struct Blacklist *new_blacklist(char *name, char *reject_reason, int ipv4, int i
}
else
blptr->status &= ~CONF_ILLEGAL;
rb_strlcpy(blptr->host, name, IRCD_RES_HOSTLEN + 1);
rb_strlcpy(blptr->reject_reason, reject_reason, IRCD_BUFSIZE);
blptr->ipv4 = ipv4;
blptr->ipv6 = ipv6;
rb_dlinkMoveList(filters, &blptr->filters);
blptr->lastwarning = 0;
return blptr;
@ -206,9 +259,17 @@ struct Blacklist *new_blacklist(char *name, char *reject_reason, int ipv4, int i
void unref_blacklist(struct Blacklist *blptr)
{
rb_dlink_node *ptr, *next_ptr;
blptr->refcount--;
if (blptr->status & CONF_ILLEGAL && blptr->refcount <= 0)
{
RB_DLINK_FOREACH_SAFE(ptr, next_ptr, blptr->filters.head)
{
rb_free(ptr);
rb_dlinkDelete(ptr, &blptr->filters);
}
rb_dlinkFindDestroy(blptr, &blacklist_list);
rb_free(blptr);
}

120
src/newconf.c
View file

@ -58,6 +58,7 @@ static char *yy_blacklist_host = NULL;
static char *yy_blacklist_reason = NULL;
static int yy_blacklist_ipv4 = 1;
static int yy_blacklist_ipv6 = 0;
static rb_dlink_list yy_blacklist_filters;
static char *yy_privset_extends = NULL;
@ -1779,9 +1780,24 @@ conf_set_alias_target(void *data)
yy_alias->target = rb_strdup(data);
}
/* XXX for below */
static void conf_set_blacklist_reason(void *data);
static void
conf_set_blacklist_host(void *data)
{
if (yy_blacklist_host)
{
conf_report_error("blacklist::host %s overlaps existing host %s",
(char *)data, yy_blacklist_host);
/* Cleanup */
conf_set_blacklist_reason(NULL);
return;
}
yy_blacklist_ipv4 = 1;
yy_blacklist_ipv6 = 0;
yy_blacklist_host = rb_strdup(data);
}
@ -1813,10 +1829,90 @@ conf_set_blacklist_type(void *data)
}
}
static void
conf_set_blacklist_matches(void *data)
{
conf_parm_t *args = data;
for (; args; args = args->next)
{
struct BlacklistFilter *filter;
char *str = args->v.string;
char *p;
int type = BLACKLIST_FILTER_LAST;
if (CF_TYPE(args->type) != CF_QSTRING)
{
conf_report_error("blacklist::matches -- must be quoted string");
continue;
}
if (str == NULL)
{
conf_report_error("blacklist::matches -- invalid entry");
continue;
}
if (strlen(str) > HOSTIPLEN)
{
conf_report_error("blacklist::matches has an entry too long: %s",
str);
continue;
}
for (p = str; *p != '\0'; p++)
{
/* Check for validity */
if (*p == '.')
type = BLACKLIST_FILTER_ALL;
else if (!isalnum(*p))
{
conf_report_error("blacklist::matches has invalid IP match entry %s",
str);
type = 0;
break;
}
}
if (type == BLACKLIST_FILTER_ALL)
{
/* Basic IP sanity check */
struct rb_sockaddr_storage tmp;
if (rb_inet_pton(AF_INET, str, &tmp) <= 0)
{
conf_report_error("blacklist::matches has invalid IP match entry %s",
str);
continue;
}
}
else if (type == BLACKLIST_FILTER_LAST)
{
/* Verify it's the correct length */
if (strlen(str) > 3)
{
conf_report_error("blacklist::matches has invalid octet match entry %s",
str);
continue;
}
}
else
{
continue; /* Invalid entry */
}
filter = rb_malloc(sizeof(struct BlacklistFilter));
filter->type = type;
rb_strlcpy(filter->filterstr, str, sizeof(filter->filterstr));
rb_dlinkAdd(filter, &filter->node, &yy_blacklist_filters);
}
}
static void
conf_set_blacklist_reason(void *data)
{
yy_blacklist_reason = rb_strdup(data);
rb_dlink_node *ptr, *nptr;
if (yy_blacklist_host && yy_blacklist_reason)
{
@ -1842,16 +1938,25 @@ conf_set_blacklist_reason(void *data)
}
}
new_blacklist(yy_blacklist_host, yy_blacklist_reason, yy_blacklist_ipv4, yy_blacklist_ipv6);
new_blacklist(yy_blacklist_host, yy_blacklist_reason, yy_blacklist_ipv4, yy_blacklist_ipv6,
&yy_blacklist_filters);
}
cleanup_bl:
rb_free(yy_blacklist_host);
rb_free(yy_blacklist_reason);
yy_blacklist_host = NULL;
yy_blacklist_reason = NULL;
yy_blacklist_ipv4 = 1;
yy_blacklist_ipv6 = 0;
RB_DLINK_FOREACH_SAFE(ptr, nptr, yy_blacklist_filters.head)
{
if (data == NULL)
rb_free(ptr);
rb_dlinkDelete(ptr, &yy_blacklist_filters);
}
rb_free(yy_blacklist_host);
rb_free(yy_blacklist_reason);
yy_blacklist_host = NULL;
yy_blacklist_reason = NULL;
yy_blacklist_ipv4 = 1;
yy_blacklist_ipv6 = 0;
}
/* public functions */
@ -2354,5 +2459,6 @@ newconf_init()
add_top_conf("blacklist", NULL, NULL, NULL);
add_conf_item("blacklist", "host", CF_QSTRING, conf_set_blacklist_host);
add_conf_item("blacklist", "type", CF_STRING | CF_FLIST, conf_set_blacklist_type);
add_conf_item("blacklist", "matches", CF_QSTRING | CF_FLIST, conf_set_blacklist_matches);
add_conf_item("blacklist", "reject_reason", CF_QSTRING, conf_set_blacklist_reason);
}