/* * charybdis: an advanced internet relay chat daemon (ircd). * hostmask.c: Code to efficiently find IP & hostmask based configs. * * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center * Copyright (C) 1996-2002 Hybrid Development Team * Copyright (C) 2002-2005 ircd-ratbox development team * Copyright (C) 2005-2008 charybdis development team * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA */ #include "stdinc.h" #include "ircd_defs.h" #include "s_conf.h" #include "hostmask.h" #include "numeric.h" #include "send.h" #include "match.h" #include "ipv4_from_ipv6.h" #ifdef RB_IPV6 static unsigned long hash_ipv6(struct sockaddr *, int); #endif static unsigned long hash_ipv4(struct sockaddr *, int); /* int parse_netmask(const char *, struct rb_sockaddr_storage *, int *); * Input: A hostmask, or an IPV4/6 address. * Output: An integer describing whether it is an IPV4, IPV6 address or a * hostmask, an address(if it is an IP mask), * a bitlength(if it is IP mask). * Side effects: None */ int parse_netmask(const char *text, struct rb_sockaddr_storage *naddr, int *nb) { char *ip = LOCAL_COPY(text); char *ptr; struct rb_sockaddr_storage *addr, xaddr; int *b, xb; if(nb == NULL) b = &xb; else b = nb; if(naddr == NULL) addr = &xaddr; else addr = naddr; if(strpbrk(ip, "*?") != NULL) { return HM_HOST; } #ifdef RB_IPV6 if(strchr(ip, ':')) { if((ptr = strchr(ip, '/'))) { *ptr = '\0'; ptr++; *b = atoi(ptr); if(*b > 128) *b = 128; else if(*b < 0) return HM_HOST; } else *b = 128; if(rb_inet_pton_sock(ip, (struct sockaddr *)addr) > 0) return HM_IPV6; else return HM_HOST; } else #endif if(strchr(text, '.')) { if((ptr = strchr(ip, '/'))) { *ptr = '\0'; ptr++; *b = atoi(ptr); if(*b > 32) *b = 32; else if(*b < 0) return HM_HOST; } else *b = 32; if(rb_inet_pton_sock(ip, (struct sockaddr *)addr) > 0) return HM_IPV4; else return HM_HOST; } return HM_HOST; } /* Hashtable stuff...now external as its used in m_stats.c */ struct AddressRec *atable[ATABLE_SIZE]; void init_host_hash(void) { memset(&atable, 0, sizeof(atable)); } /* unsigned long hash_ipv4(struct rb_sockaddr_storage*) * Input: An IP address. * Output: A hash value of the IP address. * Side effects: None */ static unsigned long hash_ipv4(struct sockaddr *saddr, int bits) { struct sockaddr_in *addr = (struct sockaddr_in *)(void *)saddr; if(bits != 0) { unsigned long av = ntohl(addr->sin_addr.s_addr) & ~((1 << (32 - bits)) - 1); return (av ^ (av >> 12) ^ (av >> 24)) & (ATABLE_SIZE - 1); } return 0; } /* unsigned long hash_ipv6(struct rb_sockaddr_storage*) * Input: An IP address. * Output: A hash value of the IP address. * Side effects: None */ #ifdef RB_IPV6 static unsigned long hash_ipv6(struct sockaddr *saddr, int bits) { struct sockaddr_in6 *addr = (struct sockaddr_in6 *)(void *)saddr; unsigned long v = 0, n; for (n = 0; n < 16; n++) { if(bits >= 8) { v ^= addr->sin6_addr.s6_addr[n]; bits -= 8; } else if(bits) { v ^= addr->sin6_addr.s6_addr[n] & ~((1 << (8 - bits)) - 1); return v & (ATABLE_SIZE - 1); } else return v & (ATABLE_SIZE - 1); } return v & (ATABLE_SIZE - 1); } #endif /* int hash_text(const char *start) * Input: The start of the text to hash. * Output: The hash of the string between 1 and (TH_MAX-1) * Side-effects: None. */ static int hash_text(const char *start) { const char *p = start; unsigned long h = 0; while(*p) { h = (h << 4) - (h + (unsigned char) ToLower(*p++)); } return (h & (ATABLE_SIZE - 1)); } /* unsigned long get_hash_mask(const char *) * Input: The text to hash. * Output: The hash of the string right of the first '.' past the last * wildcard in the string. * Side-effects: None. */ static unsigned long get_mask_hash(const char *text) { const char *hp = "", *p; for (p = text + strlen(text) - 1; p >= text; p--) if(*p == '*' || *p == '?') return hash_text(hp); else if(*p == '.') hp = p + 1; return hash_text(text); } /* struct ConfItem* find_conf_by_address(const char*, struct rb_sockaddr_storage*, * int type, int fam, const char *username) * Input: The hostname, the address, the type of mask to find, the address * family, the username. * Output: The matching value with the highest precedence. * Side-effects: None * Note: Setting bit 0 of the type means that the username is ignored. */ struct ConfItem * find_conf_by_address(const char *name, const char *sockhost, const char *orighost, struct sockaddr *addr, int type, int fam, const char *username, const char *auth_user) { unsigned long hprecv = 0; struct ConfItem *hprec = NULL; struct AddressRec *arec; int b; if(username == NULL) username = ""; if(addr) { /* Check for IPV6 matches... */ #ifdef RB_IPV6 if(fam == AF_INET6) { for (b = 128; b >= 0; b -= 16) { for (arec = atable[hash_ipv6(addr, b)]; arec; arec = arec->next) if(arec->type == (type & ~0x1) && arec->masktype == HM_IPV6 && comp_with_mask_sock(addr, (struct sockaddr *)&arec->Mask.ipa.addr, arec->Mask.ipa.bits) && (type & 0x1 || match(arec-> username, username)) && (type != CONF_CLIENT || !arec->auth_user || (auth_user && match(arec->auth_user, auth_user))) && arec->precedence > hprecv) { hprecv = arec->precedence; hprec = arec->aconf; } } } else #endif if(fam == AF_INET) { for (b = 32; b >= 0; b -= 8) { for (arec = atable[hash_ipv4(addr, b)]; arec; arec = arec->next) if(arec->type == (type & ~0x1) && arec->masktype == HM_IPV4 && comp_with_mask_sock(addr, (struct sockaddr *)&arec->Mask.ipa.addr, arec->Mask.ipa.bits) && (type & 0x1 || match(arec->username, username)) && (type != CONF_CLIENT || !arec->auth_user || (auth_user && match(arec->auth_user, auth_user))) && arec->precedence > hprecv) { hprecv = arec->precedence; hprec = arec->aconf; } } } } if(orighost != NULL) { const char *p; for (p = orighost; p != NULL;) { for (arec = atable[hash_text(p)]; arec; arec = arec->next) if((arec->type == (type & ~0x1)) && (arec->masktype == HM_HOST) && arec->precedence > hprecv && match(arec->Mask.hostname, orighost) && (type != CONF_CLIENT || !arec->auth_user || (auth_user && match(arec->auth_user, auth_user))) && (type & 0x1 || match(arec->username, username))) { hprecv = arec->precedence; hprec = arec->aconf; } p = strchr(p, '.'); if(p != NULL) p++; else break; } for (arec = atable[0]; arec; arec = arec->next) { if(arec->type == (type & ~0x1) && arec->masktype == HM_HOST && arec->precedence > hprecv && (match(arec->Mask.hostname, orighost) || (sockhost && match(arec->Mask.hostname, sockhost))) && (type != CONF_CLIENT || !arec->auth_user || (auth_user && match(arec->auth_user, auth_user))) && (type & 0x1 || match(arec->username, username))) { hprecv = arec->precedence; hprec = arec->aconf; } } } if(name != NULL) { const char *p; /* And yes - we have to check p after strchr and p after increment for * NULL -kre */ for (p = name; p != NULL;) { for (arec = atable[hash_text(p)]; arec; arec = arec->next) if((arec->type == (type & ~0x1)) && (arec->masktype == HM_HOST) && arec->precedence > hprecv && match(arec->Mask.hostname, name) && (type != CONF_CLIENT || !arec->auth_user || (auth_user && match(arec->auth_user, auth_user))) && (type & 0x1 || match(arec->username, username))) { hprecv = arec->precedence; hprec = arec->aconf; } p = strchr(p, '.'); if(p != NULL) p++; else break; } for (arec = atable[0]; arec; arec = arec->next) { if(arec->type == (type & ~0x1) && arec->masktype == HM_HOST && arec->precedence > hprecv && (match(arec->Mask.hostname, name) || (sockhost && match(arec->Mask.hostname, sockhost))) && (type != CONF_CLIENT || !arec->auth_user || (auth_user && match(arec->auth_user, auth_user))) && (type & 0x1 || match(arec->username, username))) { hprecv = arec->precedence; hprec = arec->aconf; } } } return hprec; } /* struct ConfItem* find_address_conf(const char*, const char*, * struct rb_sockaddr_storage*, int); * Input: The hostname, username, address, address family. * Output: The applicable ConfItem. * Side-effects: None */ struct ConfItem * find_address_conf(const char *host, const char *sockhost, const char *user, const char *notildeuser, struct sockaddr *ip, int aftype, char *auth_user) { struct ConfItem *iconf, *kconf; const char *vuser; #ifdef RB_IPV6 struct sockaddr_in ip4; #endif /* Find the best I-line... If none, return NULL -A1kmm */ if(!(iconf = find_conf_by_address(host, sockhost, NULL, ip, CONF_CLIENT, aftype, user, auth_user))) return NULL; /* Find what their visible username will be. * Note that the username without tilde may contain one char more. * -- jilles */ vuser = IsNoTilde(iconf) ? notildeuser : user; /* If they are exempt from K-lines, return the best I-line. -A1kmm */ if(IsConfExemptKline(iconf)) return iconf; /* Find the best K-line... -A1kmm */ kconf = find_conf_by_address(host, sockhost, NULL, ip, CONF_KILL, aftype, user, NULL); /* If they are K-lined, return the K-line */ if(kconf) return kconf; /* if theres a spoof, check it against klines.. */ if(IsConfDoSpoofIp(iconf)) { char *p = strchr(iconf->info.name, '@'); /* note, we dont need to pass sockhost here, as its * guaranteed to not match by whats above.. --anfl */ if(p) { *p = '\0'; kconf = find_conf_by_address(p+1, NULL, NULL, ip, CONF_KILL, aftype, iconf->info.name, NULL); *p = '@'; } else kconf = find_conf_by_address(iconf->info.name, NULL, NULL, ip, CONF_KILL, aftype, vuser, NULL); if(kconf) return kconf; } /* if no_tilde, check the username without tilde against klines too * -- jilles */ if(user != vuser) { kconf = find_conf_by_address(host, sockhost, NULL, ip, CONF_KILL, aftype, vuser, NULL); if(kconf) return kconf; } #ifdef RB_IPV6 if(ip != NULL && ip->sa_family == AF_INET6 && ipv4_from_ipv6((const struct sockaddr_in6 *)(const void *)ip, &ip4)) { kconf = find_conf_by_address(NULL, NULL, NULL, (struct sockaddr *)&ip4, CONF_KILL, AF_INET, vuser, NULL); if(kconf) return kconf; } #endif /* RB_IPV6 */ return iconf; } /* struct ConfItem* find_dline(struct rb_sockaddr_storage*, int) * Input: An address, an address family. * Output: The best matching D-line or exempt line. * Side effects: None. */ struct ConfItem * find_dline(struct sockaddr *addr, int aftype) { struct ConfItem *aconf; #ifdef RB_IPV6 struct sockaddr_in addr2; #endif aconf = find_conf_by_address(NULL, NULL, NULL, addr, CONF_EXEMPTDLINE | 1, aftype, NULL, NULL); if(aconf) return aconf; aconf = find_conf_by_address(NULL, NULL, NULL, addr, CONF_DLINE | 1, aftype, NULL, NULL); if(aconf) return aconf; #ifdef RB_IPV6 if(addr->sa_family == AF_INET6 && ipv4_from_ipv6((const struct sockaddr_in6 *)(const void *)addr, &addr2)) { aconf = find_conf_by_address(NULL, NULL, NULL, (struct sockaddr *)&addr2, CONF_DLINE | 1, AF_INET, NULL, NULL); if(aconf) return aconf; } #endif return NULL; } /* void find_exact_conf_by_address(const char*, int, const char *) * Input: * Output: ConfItem if found * Side-effects: None */ struct ConfItem * find_exact_conf_by_address(const char *address, int type, const char *username) { int masktype, bits; unsigned long hv; struct AddressRec *arec; struct rb_sockaddr_storage addr; if(address == NULL) address = "/NOMATCH!/"; masktype = parse_netmask(address, &addr, &bits); #ifdef RB_IPV6 if(masktype == HM_IPV6) { /* We have to do this, since we do not re-hash for every bit -A1kmm. */ hv = hash_ipv6((struct sockaddr *)&addr, bits - bits % 16); } else #endif if(masktype == HM_IPV4) { /* We have to do this, since we do not re-hash for every bit -A1kmm. */ hv = hash_ipv4((struct sockaddr *)&addr, bits - bits % 8); } else { hv = get_mask_hash(address); } for (arec = atable[hv]; arec; arec = arec->next) { if (arec->type == type && arec->masktype == masktype && (arec->username == NULL || username == NULL ? arec->username == username : !irccmp(arec->username, username))) { if (masktype == HM_HOST) { if (!irccmp(arec->Mask.hostname, address)) return arec->aconf; } else { if (arec->Mask.ipa.bits == bits && comp_with_mask_sock((struct sockaddr *)&arec->Mask.ipa.addr, (struct sockaddr *)&addr, bits)) return arec->aconf; } } } return NULL; } /* void add_conf_by_address(const char*, int, const char *, * struct ConfItem *aconf) * Input: * Output: None * Side-effects: Adds this entry to the hash table. */ void add_conf_by_address(const char *address, int type, const char *username, const char *auth_user, struct ConfItem *aconf) { static unsigned long prec_value = 0xFFFFFFFF; int masktype, bits; unsigned long hv; struct AddressRec *arec; if(address == NULL) address = "/NOMATCH!/"; arec = rb_malloc(sizeof(struct AddressRec)); masktype = parse_netmask(address, &arec->Mask.ipa.addr, &bits); arec->Mask.ipa.bits = bits; arec->masktype = masktype; #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; arec->next = atable[(hv = hash_ipv6((struct sockaddr *)&arec->Mask.ipa.addr, bits))]; atable[hv] = arec; } else #endif if(masktype == HM_IPV4) { /* We have to do this, since we do not re-hash for every bit -A1kmm. */ bits -= bits % 8; arec->next = atable[(hv = hash_ipv4((struct sockaddr *)&arec->Mask.ipa.addr, bits))]; atable[hv] = arec; } else { arec->Mask.hostname = address; 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, &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, *user, *classname; const char *pass; 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); } }