704 lines
23 KiB
C
704 lines
23 KiB
C
/*
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* charybdis: an advanced internet relay chat daemon (ircd).
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* hostmask.c: Code to efficiently find IP & hostmask based configs.
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*
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* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
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* Copyright (C) 1996-2002 Hybrid Development Team
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* Copyright (C) 2002-2005 ircd-ratbox development team
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* Copyright (C) 2005-2008 charybdis development team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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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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*/
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#include "stdinc.h"
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#include "ircd_defs.h"
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#include "s_conf.h"
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#include "hostmask.h"
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#include "numeric.h"
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#include "send.h"
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#include "match.h"
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#ifdef RB_IPV6
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static unsigned long hash_ipv6(struct sockaddr *, int);
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#endif
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static unsigned long hash_ipv4(struct sockaddr *, int);
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/* int parse_netmask(const char *, struct rb_sockaddr_storage *, int *);
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* Input: A hostmask, or an IPV4/6 address.
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* Output: An integer describing whether it is an IPV4, IPV6 address or a
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* hostmask, an address(if it is an IP mask),
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* a bitlength(if it is IP mask).
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* Side effects: None
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*/
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int
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parse_netmask(const char *text, struct sockaddr *naddr, int *nb)
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{
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char *ip = LOCAL_COPY(text);
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char *ptr;
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struct rb_sockaddr_storage *addr, xaddr;
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int *b, xb;
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if(nb == NULL)
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b = &xb;
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else
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b = nb;
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if(naddr == NULL)
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addr = (struct rb_sockaddr_storage *)&xaddr;
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else
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addr = (struct rb_sockaddr_storage *)naddr;
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if(strpbrk(ip, "*?") != NULL) {
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return HM_HOST;
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}
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#ifdef RB_IPV6
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if(strchr(ip, ':')) {
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if((ptr = strchr(ip, '/'))) {
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*ptr = '\0';
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ptr++;
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*b = atoi(ptr);
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if(*b > 128)
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*b = 128;
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} else
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*b = 128;
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if(rb_inet_pton_sock(ip, (struct sockaddr *)addr) > 0)
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return HM_IPV6;
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else
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return HM_HOST;
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} else
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#endif
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if(strchr(text, '.')) {
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if((ptr = strchr(ip, '/'))) {
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*ptr = '\0';
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ptr++;
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*b = atoi(ptr);
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if(*b > 32)
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*b = 32;
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} else
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*b = 32;
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if(rb_inet_pton_sock(ip, (struct sockaddr *)addr) > 0)
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return HM_IPV4;
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else
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return HM_HOST;
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}
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return HM_HOST;
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}
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/* Hashtable stuff...now external as its used in m_stats.c */
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struct AddressRec *atable[ATABLE_SIZE];
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void
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init_host_hash(void)
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{
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memset(&atable, 0, sizeof(atable));
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}
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/* unsigned long hash_ipv4(struct rb_sockaddr_storage*)
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* Input: An IP address.
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* Output: A hash value of the IP address.
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* Side effects: None
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*/
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static unsigned long
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hash_ipv4(struct sockaddr *saddr, int bits)
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{
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struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
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if(bits != 0) {
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unsigned long av = ntohl(addr->sin_addr.s_addr) & ~((1 << (32 - bits)) - 1);
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return (av ^ (av >> 12) ^ (av >> 24)) & (ATABLE_SIZE - 1);
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}
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return 0;
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}
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/* unsigned long hash_ipv6(struct rb_sockaddr_storage*)
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* Input: An IP address.
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* Output: A hash value of the IP address.
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* Side effects: None
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*/
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#ifdef RB_IPV6
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static unsigned long
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hash_ipv6(struct sockaddr *saddr, int bits)
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{
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struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
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unsigned long v = 0, n;
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for (n = 0; n < 16; n++) {
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if(bits >= 8) {
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v ^= addr->sin6_addr.s6_addr[n];
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bits -= 8;
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} else if(bits) {
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v ^= addr->sin6_addr.s6_addr[n] & ~((1 << (8 - bits)) - 1);
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return v & (ATABLE_SIZE - 1);
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} else
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return v & (ATABLE_SIZE - 1);
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}
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return v & (ATABLE_SIZE - 1);
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}
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#endif
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/* int hash_text(const char *start)
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* Input: The start of the text to hash.
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* Output: The hash of the string between 1 and (TH_MAX-1)
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* Side-effects: None.
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*/
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static int
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hash_text(const char *start)
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{
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const char *p = start;
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unsigned long h = 0;
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while(*p) {
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h = (h << 4) - (h + (unsigned char) ToLower(*p++));
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}
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return (h & (ATABLE_SIZE - 1));
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}
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/* unsigned long get_hash_mask(const char *)
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* Input: The text to hash.
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* Output: The hash of the string right of the first '.' past the last
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* wildcard in the string.
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* Side-effects: None.
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*/
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static unsigned long
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get_mask_hash(const char *text)
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{
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const char *hp = "", *p;
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for (p = text + strlen(text) - 1; p >= text; p--)
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if(*p == '*' || *p == '?')
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return hash_text(hp);
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else if(*p == '.')
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hp = p + 1;
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return hash_text(text);
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}
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/* struct ConfItem* find_conf_by_address(const char*, struct rb_sockaddr_storage*,
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* int type, int fam, const char *username)
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* Input: The hostname, the address, the type of mask to find, the address
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* family, the username.
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* Output: The matching value with the highest precedence.
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* Side-effects: None
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* Note: Setting bit 0 of the type means that the username is ignored.
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*/
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struct ConfItem *
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find_conf_by_address(const char *name, const char *sockhost,
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const char *orighost,
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struct sockaddr *addr, int type, int fam,
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const char *username, const char *auth_user)
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{
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unsigned long hprecv = 0;
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struct ConfItem *hprec = NULL;
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struct AddressRec *arec;
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int b;
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if(username == NULL)
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username = "";
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if(addr) {
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/* Check for IPV6 matches... */
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#ifdef RB_IPV6
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if(fam == AF_INET6) {
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for (b = 128; b >= 0; b -= 16) {
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for (arec = atable[hash_ipv6(addr, b)]; arec; arec = arec->next)
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if(arec->type == (type & ~0x1) &&
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arec->masktype == HM_IPV6 &&
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comp_with_mask_sock(addr, (struct sockaddr *)&arec->Mask.ipa.addr,
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arec->Mask.ipa.bits) &&
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(type & 0x1 || match(arec-> username, username)) &&
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(type != CONF_CLIENT || !arec->auth_user ||
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(auth_user && match(arec->auth_user, auth_user))) &&
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arec->precedence > hprecv) {
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hprecv = arec->precedence;
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hprec = arec->aconf;
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}
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}
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} else
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#endif
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if(fam == AF_INET) {
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for (b = 32; b >= 0; b -= 8) {
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for (arec = atable[hash_ipv4(addr, b)]; arec; arec = arec->next)
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if(arec->type == (type & ~0x1) &&
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arec->masktype == HM_IPV4 &&
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comp_with_mask_sock(addr, (struct sockaddr *)&arec->Mask.ipa.addr,
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arec->Mask.ipa.bits) &&
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(type & 0x1 || match(arec->username, username)) &&
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(type != CONF_CLIENT || !arec->auth_user ||
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(auth_user && match(arec->auth_user, auth_user))) &&
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arec->precedence > hprecv) {
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hprecv = arec->precedence;
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hprec = arec->aconf;
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}
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}
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}
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}
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if(orighost != NULL) {
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const char *p;
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for (p = orighost; p != NULL;) {
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for (arec = atable[hash_text(p)]; arec; arec = arec->next)
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if((arec->type == (type & ~0x1)) &&
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(arec->masktype == HM_HOST) &&
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arec->precedence > hprecv &&
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match(arec->Mask.hostname, orighost) &&
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(type != CONF_CLIENT || !arec->auth_user ||
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(auth_user && match(arec->auth_user, auth_user))) &&
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(type & 0x1 || match(arec->username, username))) {
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hprecv = arec->precedence;
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hprec = arec->aconf;
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}
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p = strchr(p, '.');
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if(p != NULL)
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p++;
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else
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break;
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}
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for (arec = atable[0]; arec; arec = arec->next) {
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if(arec->type == (type & ~0x1) &&
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arec->masktype == HM_HOST &&
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arec->precedence > hprecv &&
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(match(arec->Mask.hostname, orighost) ||
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(sockhost && match(arec->Mask.hostname, sockhost))) &&
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(type != CONF_CLIENT || !arec->auth_user ||
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(auth_user && match(arec->auth_user, auth_user))) &&
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(type & 0x1 || match(arec->username, username))) {
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hprecv = arec->precedence;
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hprec = arec->aconf;
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}
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}
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}
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if(name != NULL) {
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const char *p;
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/* And yes - we have to check p after strchr and p after increment for
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* NULL -kre */
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for (p = name; p != NULL;) {
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for (arec = atable[hash_text(p)]; arec; arec = arec->next)
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if((arec->type == (type & ~0x1)) &&
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(arec->masktype == HM_HOST) &&
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arec->precedence > hprecv &&
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match(arec->Mask.hostname, name) &&
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(type != CONF_CLIENT || !arec->auth_user ||
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(auth_user && match(arec->auth_user, auth_user))) &&
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(type & 0x1 || match(arec->username, username))) {
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hprecv = arec->precedence;
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hprec = arec->aconf;
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}
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p = strchr(p, '.');
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if(p != NULL)
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p++;
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else
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break;
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}
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for (arec = atable[0]; arec; arec = arec->next) {
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if(arec->type == (type & ~0x1) &&
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arec->masktype == HM_HOST &&
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arec->precedence > hprecv &&
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(match(arec->Mask.hostname, name) ||
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(sockhost && match(arec->Mask.hostname, sockhost))) &&
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(type != CONF_CLIENT || !arec->auth_user ||
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(auth_user && match(arec->auth_user, auth_user))) &&
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(type & 0x1 || match(arec->username, username))) {
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hprecv = arec->precedence;
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hprec = arec->aconf;
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}
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}
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}
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return hprec;
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}
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/* struct ConfItem* find_address_conf(const char*, const char*,
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* struct rb_sockaddr_storage*, int);
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* Input: The hostname, username, address, address family.
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* Output: The applicable ConfItem.
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* Side-effects: None
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*/
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struct ConfItem *
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find_address_conf(const char *host, const char *sockhost, const char *user,
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const char *notildeuser, struct sockaddr *ip, int aftype, char *auth_user)
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{
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struct ConfItem *iconf, *kconf;
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const char *vuser;
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/* Find the best I-line... If none, return NULL -A1kmm */
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if(!(iconf = find_conf_by_address(host, sockhost, NULL, ip, CONF_CLIENT, aftype, user, auth_user)))
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return NULL;
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/* Find what their visible username will be.
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* Note that the username without tilde may contain one char more.
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* -- jilles */
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vuser = IsNoTilde(iconf) ? notildeuser : user;
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/* If they are exempt from K-lines, return the best I-line. -A1kmm */
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if(IsConfExemptKline(iconf))
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return iconf;
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/* Find the best K-line... -A1kmm */
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kconf = find_conf_by_address(host, sockhost, NULL, ip, CONF_KILL, aftype, user, NULL);
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/* If they are K-lined, return the K-line */
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if(kconf)
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return kconf;
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/* if theres a spoof, check it against klines.. */
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if(IsConfDoSpoofIp(iconf)) {
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char *p = strchr(iconf->info.name, '@');
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/* note, we dont need to pass sockhost here, as its
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* guaranteed to not match by whats above.. --anfl
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*/
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if(p) {
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*p = '\0';
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kconf = find_conf_by_address(p+1, NULL, NULL, ip, CONF_KILL, aftype, iconf->info.name, NULL);
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*p = '@';
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} else
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kconf = find_conf_by_address(iconf->info.name, NULL, NULL, ip, CONF_KILL, aftype, vuser, NULL);
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if(kconf)
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return kconf;
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}
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/* if no_tilde, check the username without tilde against klines too
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* -- jilles */
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if(user != vuser) {
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kconf = find_conf_by_address(host, sockhost, NULL, ip, CONF_KILL, aftype, vuser, NULL);
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if(kconf)
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return kconf;
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}
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return iconf;
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}
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/* struct ConfItem* find_dline(struct rb_sockaddr_storage*, int)
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* Input: An address, an address family.
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* Output: The best matching D-line or exempt line.
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* Side effects: None.
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*/
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struct ConfItem *
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find_dline(struct sockaddr *addr, int aftype)
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{
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struct ConfItem *eline;
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eline = find_conf_by_address(NULL, NULL, NULL, addr, CONF_EXEMPTDLINE | 1, aftype, NULL, NULL);
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if(eline)
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return eline;
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return find_conf_by_address(NULL, NULL, NULL, addr, CONF_DLINE | 1, aftype, NULL, NULL);
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}
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/* void find_exact_conf_by_address(const char*, int, const char *)
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* Input:
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* Output: ConfItem if found
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* Side-effects: None
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*/
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struct ConfItem *
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find_exact_conf_by_address(const char *address, int type, const char *username)
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{
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int masktype, bits;
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unsigned long hv;
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struct AddressRec *arec;
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struct rb_sockaddr_storage addr;
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if(address == NULL)
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address = "/NOMATCH!/";
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masktype = parse_netmask(address, (struct sockaddr *)&addr, &bits);
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#ifdef RB_IPV6
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if(masktype == HM_IPV6) {
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/* We have to do this, since we do not re-hash for every bit -A1kmm. */
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hv = hash_ipv6((struct sockaddr *)&addr, bits - bits % 16);
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} else
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#endif
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if(masktype == HM_IPV4) {
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/* We have to do this, since we do not re-hash for every bit -A1kmm. */
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hv = hash_ipv4((struct sockaddr *)&addr, bits - bits % 8);
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} else {
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hv = get_mask_hash(address);
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}
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for (arec = atable[hv]; arec; arec = arec->next) {
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if (arec->type == type &&
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arec->masktype == masktype &&
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(arec->username == NULL || username == NULL ? arec->username == username : !irccmp(arec->username, username))) {
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if (masktype == HM_HOST) {
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if (!irccmp(arec->Mask.hostname, address))
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return arec->aconf;
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} else {
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if (arec->Mask.ipa.bits == bits &&
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comp_with_mask_sock((struct sockaddr *)&arec->Mask.ipa.addr, (struct sockaddr *)&addr, bits))
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return arec->aconf;
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}
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}
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}
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return NULL;
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}
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/* void add_conf_by_address(const char*, int, const char *,
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* struct ConfItem *aconf)
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* Input:
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* Output: None
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* Side-effects: Adds this entry to the hash table.
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*/
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void
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add_conf_by_address(const char *address, int type, const char *username, const char *auth_user, struct ConfItem *aconf)
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{
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static unsigned long prec_value = 0xFFFFFFFF;
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int masktype, bits;
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unsigned long hv;
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struct AddressRec *arec;
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if(address == NULL)
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address = "/NOMATCH!/";
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arec = rb_malloc(sizeof(struct AddressRec));
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masktype = parse_netmask(address, (struct sockaddr *)&arec->Mask.ipa.addr, &bits);
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arec->Mask.ipa.bits = bits;
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arec->masktype = masktype;
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#ifdef RB_IPV6
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if(masktype == HM_IPV6) {
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/* We have to do this, since we do not re-hash for every bit -A1kmm. */
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bits -= bits % 16;
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arec->next = atable[(hv = hash_ipv6((struct sockaddr *)&arec->Mask.ipa.addr, bits))];
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atable[hv] = arec;
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} else
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#endif
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if(masktype == HM_IPV4) {
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/* We have to do this, since we do not re-hash for every bit -A1kmm. */
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bits -= bits % 8;
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arec->next = atable[(hv = hash_ipv4((struct sockaddr *)&arec->Mask.ipa.addr, bits))];
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atable[hv] = arec;
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} else {
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arec->Mask.hostname = address;
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arec->next = atable[(hv = get_mask_hash(address))];
|
|
atable[hv] = arec;
|
|
}
|
|
arec->username = username;
|
|
arec->auth_user = auth_user;
|
|
arec->aconf = aconf;
|
|
arec->precedence = prec_value--;
|
|
arec->type = type;
|
|
}
|
|
|
|
/* void delete_one_address(const char*, struct ConfItem*)
|
|
* Input: An address string, the associated ConfItem.
|
|
* Output: None
|
|
* Side effects: Deletes an address record. Frees the ConfItem if there
|
|
* is nothing referencing it, sets it as illegal otherwise.
|
|
*/
|
|
void
|
|
delete_one_address_conf(const char *address, struct ConfItem *aconf)
|
|
{
|
|
int masktype, bits;
|
|
unsigned long hv;
|
|
struct AddressRec *arec, *arecl = NULL;
|
|
struct rb_sockaddr_storage addr;
|
|
masktype = parse_netmask(address, (struct sockaddr *)&addr, &bits);
|
|
#ifdef RB_IPV6
|
|
if(masktype == HM_IPV6) {
|
|
/* We have to do this, since we do not re-hash for every bit -A1kmm. */
|
|
bits -= bits % 16;
|
|
hv = hash_ipv6((struct sockaddr *)&addr, bits);
|
|
} else
|
|
#endif
|
|
if(masktype == HM_IPV4) {
|
|
/* We have to do this, since we do not re-hash for every bit -A1kmm. */
|
|
bits -= bits % 8;
|
|
hv = hash_ipv4((struct sockaddr *)&addr, bits);
|
|
} else
|
|
hv = get_mask_hash(address);
|
|
for (arec = atable[hv]; arec; arec = arec->next) {
|
|
if(arec->aconf == aconf) {
|
|
if(arecl)
|
|
arecl->next = arec->next;
|
|
else
|
|
atable[hv] = arec->next;
|
|
aconf->status |= CONF_ILLEGAL;
|
|
if(!aconf->clients)
|
|
free_conf(aconf);
|
|
rb_free(arec);
|
|
return;
|
|
}
|
|
arecl = arec;
|
|
}
|
|
}
|
|
|
|
/* void clear_out_address_conf(void)
|
|
* Input: None
|
|
* Output: None
|
|
* Side effects: Clears out all address records in the hash table,
|
|
* frees them, and frees the ConfItems if nothing references
|
|
* them, otherwise sets them as illegal.
|
|
*/
|
|
void
|
|
clear_out_address_conf(void)
|
|
{
|
|
int i;
|
|
struct AddressRec **store_next;
|
|
struct AddressRec *arec, *arecn;
|
|
|
|
for (i = 0; i < ATABLE_SIZE; i++) {
|
|
store_next = &atable[i];
|
|
for (arec = atable[i]; arec; arec = arecn) {
|
|
arecn = arec->next;
|
|
/* We keep the temporary K-lines and destroy the
|
|
* permanent ones, just to be confusing :) -A1kmm */
|
|
if(arec->aconf->flags & CONF_FLAGS_TEMPORARY ||
|
|
(arec->type != CONF_CLIENT && arec->type != CONF_EXEMPTDLINE)) {
|
|
*store_next = arec;
|
|
store_next = &arec->next;
|
|
} else {
|
|
arec->aconf->status |= CONF_ILLEGAL;
|
|
if(!arec->aconf->clients)
|
|
free_conf(arec->aconf);
|
|
rb_free(arec);
|
|
}
|
|
}
|
|
*store_next = NULL;
|
|
}
|
|
}
|
|
|
|
void
|
|
clear_out_address_conf_bans(void)
|
|
{
|
|
int i;
|
|
struct AddressRec **store_next;
|
|
struct AddressRec *arec, *arecn;
|
|
|
|
for (i = 0; i < ATABLE_SIZE; i++) {
|
|
store_next = &atable[i];
|
|
for (arec = atable[i]; arec; arec = arecn) {
|
|
arecn = arec->next;
|
|
/* We keep the temporary K-lines and destroy the
|
|
* permanent ones, just to be confusing :) -A1kmm */
|
|
if(arec->aconf->flags & CONF_FLAGS_TEMPORARY ||
|
|
(arec->type == CONF_CLIENT || arec->type == CONF_EXEMPTDLINE)) {
|
|
*store_next = arec;
|
|
store_next = &arec->next;
|
|
} else {
|
|
arec->aconf->status |= CONF_ILLEGAL;
|
|
if(!arec->aconf->clients)
|
|
free_conf(arec->aconf);
|
|
rb_free(arec);
|
|
}
|
|
}
|
|
*store_next = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* show_iline_prefix()
|
|
*
|
|
* inputs - pointer to struct Client requesting output
|
|
* - pointer to struct ConfItem
|
|
* - name to which iline prefix will be prefixed to
|
|
* output - pointer to static string with prefixes listed in ascii form
|
|
* side effects - NONE
|
|
*/
|
|
char *
|
|
show_iline_prefix(struct Client *sptr, struct ConfItem *aconf, char *name)
|
|
{
|
|
static char prefix_of_host[USERLEN + 15];
|
|
char *prefix_ptr;
|
|
|
|
prefix_ptr = prefix_of_host;
|
|
if(IsNoTilde(aconf))
|
|
*prefix_ptr++ = '-';
|
|
if(IsNeedIdentd(aconf))
|
|
*prefix_ptr++ = '+';
|
|
if(IsConfDoSpoofIp(aconf))
|
|
*prefix_ptr++ = '=';
|
|
if(IsOper(sptr) && IsConfExemptFlood(aconf))
|
|
*prefix_ptr++ = '|';
|
|
if(IsOper(sptr) && IsConfExemptDNSBL(aconf) && !IsConfExemptKline(aconf))
|
|
*prefix_ptr++ = '$';
|
|
if(IsOper(sptr) && IsConfExemptKline(aconf))
|
|
*prefix_ptr++ = '^';
|
|
if(IsOper(sptr) && IsConfExemptLimits(aconf))
|
|
*prefix_ptr++ = '>';
|
|
*prefix_ptr = '\0';
|
|
strncpy(prefix_ptr, name, USERLEN);
|
|
return (prefix_of_host);
|
|
}
|
|
|
|
/* report_auth()
|
|
*
|
|
* Inputs: pointer to client to report to
|
|
* Output: None
|
|
* Side effects: Reports configured auth{} blocks to client_p
|
|
*/
|
|
void
|
|
report_auth(struct Client *client_p)
|
|
{
|
|
char *name, *host, *pass, *user, *classname;
|
|
struct AddressRec *arec;
|
|
struct ConfItem *aconf;
|
|
int i, port;
|
|
|
|
for (i = 0; i < ATABLE_SIZE; i++)
|
|
for (arec = atable[i]; arec; arec = arec->next)
|
|
if(arec->type == CONF_CLIENT) {
|
|
aconf = arec->aconf;
|
|
|
|
if(!IsOper(client_p) && IsConfDoSpoofIp(aconf))
|
|
continue;
|
|
|
|
get_printable_conf(aconf, &name, &host, &pass, &user, &port,
|
|
&classname);
|
|
|
|
if(!EmptyString(aconf->spasswd))
|
|
pass = aconf->spasswd;
|
|
|
|
sendto_one_numeric(client_p, RPL_STATSILINE,
|
|
form_str(RPL_STATSILINE),
|
|
name, pass, show_iline_prefix(client_p, aconf, user),
|
|
show_ip_conf(aconf, client_p) ? host : "255.255.255.255",
|
|
port, classname);
|
|
}
|
|
}
|
|
|
|
/* report_Klines()
|
|
*
|
|
* inputs - Client to report to, mask
|
|
* outputs -
|
|
* side effects - Reports configured K-lines to client_p.
|
|
*/
|
|
void
|
|
report_Klines(struct Client *source_p)
|
|
{
|
|
char *host, *pass, *user, *oper_reason;
|
|
struct AddressRec *arec;
|
|
struct ConfItem *aconf = NULL;
|
|
int i;
|
|
|
|
for (i = 0; i < ATABLE_SIZE; i++) {
|
|
for (arec = atable[i]; arec; arec = arec->next) {
|
|
if(arec->type == CONF_KILL) {
|
|
aconf = arec->aconf;
|
|
|
|
/* its a tempkline, theyre reported elsewhere */
|
|
if(aconf->flags & CONF_FLAGS_TEMPORARY)
|
|
continue;
|
|
|
|
get_printable_kline(source_p, aconf, &host, &pass, &user, &oper_reason);
|
|
sendto_one_numeric(source_p, RPL_STATSKLINE,
|
|
form_str(RPL_STATSKLINE),
|
|
'K', host, user, pass,
|
|
oper_reason ? "|" : "",
|
|
oper_reason ? oper_reason : "");
|
|
}
|
|
}
|
|
}
|
|
}
|