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Support IPv6 blacklists. Also add a conf file option allowing the use of IPv4, IPv6, or both for a blacklist.
Although few blacklists currently support IPv6 lookups, they will likely begin to do so in the near future as more net trash begins using IPv6.
This commit is contained in:
Elizabeth Jennifer Myers
parent
6493f05d8c
commit
0a1e77c27c
5 changed files with 140 additions and 20 deletions
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@ -361,7 +361,7 @@ serverhide {
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* Word to the wise: Do not use blacklists like SPEWS for blocking IRC
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* connections.
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*
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* As of charybdis 2.1.3, you can do some keyword substitution on the rejection
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* As of charybdis 2.2, you can do some keyword substitution on the rejection
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* reason. The available keyword substitutions are:
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*
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* ${ip} - the user's IP
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@ -370,19 +370,32 @@ serverhide {
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* ${nick} - the user's nickname
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* ${network-name} - the name of the network
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*
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* As of charybdis 3.4, a type parameter is supported, which specifies the
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* address families the blacklist supports. IPv4 and IPv6 are supported.
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* IPv4 is currently the default as few blacklists support IPv6 operation
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* as of this writing.
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*
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* Note: AHBL (the providers of the below *.ahbl.org BLs) request that they be
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* contacted, via email, at admins@2mbit.com before using these BLs.
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* See <http://www.ahbl.org/services.php> for more information.
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*/
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blacklist {
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host = "rbl.efnetrbl.org";
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type = ipv4;
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reject_reason = "${nick}, your IP (${ip}) is listed in EFnet's RBL. For assistance, see http://efnetrbl.org/?i=${ip}";
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# host = "ircbl.ahbl.org";
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# type = ipv4;
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# reject_reason = "${nick}, your IP (${ip}) is listed in ${dnsbl-host} for having an open proxy. In order to protect ${network-name} from abuse, we are not allowing connections with open proxies to connect.";
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#
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# host = "tor.ahbl.org";
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# type = ipv4;
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# reject_reason = "${nick}, your IP (${ip}) is listed as a TOR exit node. In order to protect ${network-name} from tor-based abuse, we are not allowing TOR exit nodes to connect to our network.";
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#
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/* Example of a blacklist that supports both IPv4 and IPv6 */
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# host = "foobl.blacklist.invalid";
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# type = ipv4, ipv6;
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# reject_reason = "${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";
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};
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alias "NickServ" {
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@ -820,19 +820,32 @@ serverhide {
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* ${nick} - the user's nickname
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* ${network-name} - the name of the network
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*
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* As of charybdis 3.4, a type parameter is supported, which specifies the
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* address families the blacklist supports. IPv4 and IPv6 are supported.
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* IPv4 is currently the default as few blacklists support IPv6 operation
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* as of this writing.
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*
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* Note: AHBL (the providers of the below *.ahbl.org BLs) request that they be
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* contacted, via email, at admins@2mbit.com before using these BLs.
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* See <http://www.ahbl.org/services.php> for more information.
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*/
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blacklist {
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host = "rbl.efnetrbl.org";
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type = ipv4;
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reject_reason = "${nick}, your IP (${ip}) is listed in EFnet's RBL. For assistance, see http://efnetrbl.org/?i=${ip}";
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# host = "ircbl.ahbl.org";
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# type = ipv4;
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# reject_reason = "${nick}, your IP (${ip}) is listed in ${dnsbl-host} for having an open proxy. In order to protect ${network-name} from abuse, we are not allowing connections with open proxies to connect.";
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#
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# host = "tor.ahbl.org";
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# type = ipv4;
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# reject_reason = "${nick}, your IP (${ip}) is listed as a TOR exit node. In order to protect ${network-name} from tor-based abuse, we are not allowing TOR exit nodes to connect to our network.";
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#
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/* Example of a blacklist that supports both IPv4 and IPv6 */
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# host = "foobl.blacklist.invalid";
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# type = ipv4, ipv6;
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# reject_reason = "${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";
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};
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/*
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@ -19,7 +19,6 @@
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* $Id: blacklist.h 2023 2006-09-02 23:47:27Z jilles $
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*/
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#ifndef _BLACKLIST_H_
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@ -29,6 +28,8 @@
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struct Blacklist {
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unsigned int status; /* If CONF_ILLEGAL, delete when no clients */
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int refcount;
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int ipv4; /* Does this blacklist support IPv4 lookups? */
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int ipv6; /* Does this blacklist support IPv6 lookups? */
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char host[IRCD_RES_HOSTLEN + 1];
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char reject_reason[IRCD_BUFSIZE];
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unsigned int hits;
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@ -44,7 +45,7 @@ struct BlacklistClient {
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};
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/* public interfaces */
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struct Blacklist *new_blacklist(char *host, char *reject_entry);
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struct Blacklist *new_blacklist(char *host, char *reject_reason, int ipv4, int ipv6);
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void lookup_blacklists(struct Client *client_p);
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void abort_blacklist_queries(struct Client *client_p);
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void unref_blacklist(struct Blacklist *blptr);
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@ -2,7 +2,7 @@
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* charybdis: A slightly useful ircd.
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* blacklist.c: Manages DNS blacklist entries and lookups
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*
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* Copyright (C) 2006-2008 charybdis development team
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* Copyright (C) 2006-2011 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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@ -30,7 +30,6 @@
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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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* $Id: blacklist.c 2743 2006-11-10 15:15:00Z jilles $
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*/
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#include "stdinc.h"
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@ -113,7 +112,6 @@ static void blacklist_dns_callback(void *vptr, struct DNSReply *reply)
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rb_free(blcptr);
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}
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/* XXX: no IPv6 implementation, not to concerned right now though. */
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static void initiate_blacklist_dnsquery(struct Blacklist *blptr, struct Client *client_p)
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{
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struct BlacklistClient *blcptr = rb_malloc(sizeof(struct BlacklistClient));
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@ -126,15 +124,54 @@ static void initiate_blacklist_dnsquery(struct Blacklist *blptr, struct Client *
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blcptr->dns_query.ptr = blcptr;
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blcptr->dns_query.callback = blacklist_dns_callback;
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ip = (uint8_t *)&((struct sockaddr_in *)&client_p->localClient->ip)->sin_addr.s_addr;
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if ((client_p->localClient->ip.ss_family == AF_INET) && blptr->ipv4)
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{
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ip = (uint8_t *)&((struct sockaddr_in *)&client_p->localClient->ip)->sin_addr.s_addr;
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/* becomes 2.0.0.127.torbl.ahbl.org or whatever */
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rb_snprintf(buf, sizeof buf, "%u.%u.%u.%u.%s",
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(unsigned int) ip[3],
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(unsigned int) ip[2],
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(unsigned int) ip[1],
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(unsigned int) ip[0],
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blptr->host);
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/* becomes 2.0.0.127.torbl.ahbl.org or whatever */
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rb_snprintf(buf, sizeof buf, "%d.%d.%d.%d.%s",
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(unsigned int) ip[3],
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(unsigned int) ip[2],
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(unsigned int) ip[1],
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(unsigned int) ip[0],
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blptr->host);
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}
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/* IPv6 is supported now. --Elizabeth */
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else if ((client_p->localClient->ip.ss_family == AF_INET6) && blptr->ipv6)
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{
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/* Breaks it into ip[0] = 0x00, ip[1] = 0x00... ip[16] = 0x01 for localhost
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* I wish there was a uint4_t for C, this would make the below cleaner, but... */
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ip = (uint8_t *)&((struct sockaddr_in6 *)&client_p->localClient->ip)->sin6_addr.s6_addr;
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char *bufptr = buf;
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int i;
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/* The below will give us something like
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* 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.foobl.invalid
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*/
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/* Going backwards */
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for (i = 15; i >= 0; i--)
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{
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/* Get upper and lower nibbles (yes this works fine on
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* both big and little endian) */
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uint8_t hi = (ip[i] >> 4) & 0x0F;
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uint8_t lo = ip[i] & 0x0F;
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/* One part... (why 5? rb_snprintf adds \0) */
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rb_snprintf(bufptr, 5, "%1x.%1x.",
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(unsigned int) lo, /* Remember, backwards */
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(unsigned int) hi);
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/* Lurch forward to next position */
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bufptr += 4;
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}
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/* Tack host on */
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strcpy(bufptr, blptr->host);
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}
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/* This shouldn't happen... */
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else
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return;
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gethost_byname_type(buf, &blcptr->dns_query, T_A);
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@ -143,7 +180,7 @@ static void initiate_blacklist_dnsquery(struct Blacklist *blptr, struct Client *
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}
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/* public interfaces */
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struct Blacklist *new_blacklist(char *name, char *reject_reason)
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struct Blacklist *new_blacklist(char *name, char *reject_reason, int ipv4, int ipv6)
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{
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struct Blacklist *blptr;
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@ -160,6 +197,8 @@ struct Blacklist *new_blacklist(char *name, char *reject_reason)
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blptr->status &= ~CONF_ILLEGAL;
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rb_strlcpy(blptr->host, name, IRCD_RES_HOSTLEN + 1);
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rb_strlcpy(blptr->reject_reason, reject_reason, IRCD_BUFSIZE);
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blptr->ipv4 = ipv4;
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blptr->ipv6 = ipv6;
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blptr->lastwarning = 0;
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return blptr;
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@ -179,10 +218,6 @@ void lookup_blacklists(struct Client *client_p)
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{
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rb_dlink_node *nptr;
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/* We don't do IPv6 right now, sorry! */
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if (client_p->localClient->ip.ss_family == AF_INET6)
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return;
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RB_DLINK_FOREACH(nptr, blacklist_list.head)
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{
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struct Blacklist *blptr = (struct Blacklist *) nptr->data;
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@ -54,6 +54,9 @@ static struct alias_entry *yy_alias = NULL;
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static char *yy_blacklist_host = NULL;
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static char *yy_blacklist_reason = NULL;
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static int yy_blacklist_ipv4 = 1;
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static int yy_blacklist_ipv6 = 0;
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static char *yy_privset_extends = NULL;
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static const char *
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@ -1775,6 +1778,34 @@ conf_set_blacklist_host(void *data)
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yy_blacklist_host = rb_strdup(data);
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}
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static void
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conf_set_blacklist_type(void *data)
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{
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conf_parm_t *args = data;
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/* Don't assume we have either if we got here */
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yy_blacklist_ipv4 = 0;
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yy_blacklist_ipv6 = 0;
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for (; args; args = args->next)
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{
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if (!strcasecmp(args->v.string, "ipv4"))
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yy_blacklist_ipv4 = 1;
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else if (!strcasecmp(args->v.string, "ipv6"))
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yy_blacklist_ipv6 = 1;
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else
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conf_report_error("blacklist::type has unknown address family %s",
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args->v.string);
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}
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/* If we have neither, just default to IPv4 */
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if (!yy_blacklist_ipv4 && !yy_blacklist_ipv6)
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{
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conf_report_error("blacklist::type has neither IPv4 nor IPv6 (defaulting to IPv4)");
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yy_blacklist_ipv4 = 1;
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}
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}
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static void
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conf_set_blacklist_reason(void *data)
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{
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@ -1782,11 +1813,37 @@ conf_set_blacklist_reason(void *data)
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if (yy_blacklist_host && yy_blacklist_reason)
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{
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new_blacklist(yy_blacklist_host, yy_blacklist_reason);
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if (yy_blacklist_ipv6)
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{
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/* Make sure things fit (64 = alnum count + dots) */
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if ((64 + strlen(yy_blacklist_host)) > IRCD_RES_HOSTLEN)
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{
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conf_report_error("blacklist::host %s results in IPv6 queries that are too long",
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yy_blacklist_host);
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goto cleanup_bl;
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}
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}
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/* Avoid doing redundant check, IPv6 is bigger than IPv4 --Elizabeth */
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if (yy_blacklist_ipv4 && !yy_blacklist_ipv6)
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{
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/* Make sure things fit (16 = number of nums + dots) */
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if ((16 + strlen(yy_blacklist_host)) > IRCD_RES_HOSTLEN)
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{
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conf_report_error("blacklist::host %s results in IPv4 queries that are too long",
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yy_blacklist_host);
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goto cleanup_bl;
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}
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}
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new_blacklist(yy_blacklist_host, yy_blacklist_reason, yy_blacklist_ipv4, yy_blacklist_ipv6);
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cleanup_bl:
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rb_free(yy_blacklist_host);
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rb_free(yy_blacklist_reason);
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yy_blacklist_host = NULL;
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yy_blacklist_reason = NULL;
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yy_blacklist_ipv4 = 1;
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yy_blacklist_ipv6 = 0;
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}
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}
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@ -2279,5 +2336,6 @@ newconf_init()
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add_top_conf("blacklist", NULL, NULL, NULL);
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add_conf_item("blacklist", "host", CF_QSTRING, conf_set_blacklist_host);
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add_conf_item("blacklist", "type", CF_STRING | CF_FLIST, conf_set_blacklist_type);
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add_conf_item("blacklist", "reject_reason", CF_QSTRING, conf_set_blacklist_reason);
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}
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