/* * ProFTPD - FTP server daemon * Copyright (c) 2003 The ProFTPD Project 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. * * As a special exemption, the ProFTPD Project team and other respective * copyright holders give permission to link this program with OpenSSL, and * distribute the resulting executable, without including the source code for * OpenSSL in the source distribution. */ /* Network ACL routines * $Id: netacl.c,v 1.10 2005/10/10 17:58:31 castaglia Exp $ */ #include "conf.h" extern int ServerUseReverseDNS; struct pr_netacl_t { pr_netacl_type_t type; char *pattern; int negated; pr_netaddr_t *addr; unsigned int masklen; }; pr_netacl_type_t pr_netacl_get_type(pr_netacl_t *acl) { return acl->type; } int pr_netacl_match(pr_netacl_t *acl, pr_netaddr_t *addr) { if (!acl || !addr) return -2; switch (acl->type) { case PR_NETACL_TYPE_ALL: pr_log_debug(DEBUG10, "NetACL: matched 'ALL'"); return 1; case PR_NETACL_TYPE_NONE: pr_log_debug(DEBUG10, "NetACL: matched 'NONE'"); return -1; case PR_NETACL_TYPE_IPMASK: if (pr_netaddr_ncmp(addr, acl->addr, acl->masklen) == 0) { pr_log_debug(DEBUG10, "NetACL: matched IP/mask"); return 1; } break; case PR_NETACL_TYPE_IPMATCH: if (pr_netaddr_cmp(addr, acl->addr) == 0) { pr_log_debug(DEBUG10, "NetACL: matched IP address"); return 1; } break; case PR_NETACL_TYPE_DNSMATCH: if (strcmp(pr_netaddr_get_dnsstr(addr), acl->pattern) == 0) { pr_log_debug(DEBUG10, "NetACL: matched DNS name"); return 1; } break; case PR_NETACL_TYPE_IPGLOB: if (pr_netaddr_fnmatch(addr, acl->pattern, PR_NETADDR_MATCH_IP) == TRUE) { pr_log_debug(DEBUG10, "NetACL: matched IP glob pattern"); return 1; } break; case PR_NETACL_TYPE_DNSGLOB: if (ServerUseReverseDNS && pr_netaddr_fnmatch(addr, acl->pattern, PR_NETADDR_MATCH_DNS) == TRUE) { pr_log_debug(DEBUG10, "NetACL: matched DNS glob pattern"); return 1; } break; default: break; } return 0; } pr_netacl_t *pr_netacl_create(pool *p, char *aclstr) { pr_netacl_t *acl; char *cp; if (!p || !aclstr) { errno = EINVAL; return NULL; } /* Parse the given rule into a netacl object. */ acl = pcalloc(p, sizeof(pr_netacl_t)); if (strcasecmp(aclstr, "all") == 0) { acl->type = PR_NETACL_TYPE_ALL; } else if (strcasecmp(aclstr, "none") == 0) { acl->type = PR_NETACL_TYPE_NONE; } else if ((cp = strchr(aclstr, '/')) != NULL) { char *tmp; acl->type = PR_NETACL_TYPE_IPMASK; *cp = '\0'; /* Check if the given rule is negated. */ if (*aclstr == '!') { acl->negated = TRUE; aclstr++; } /* We have some type of IP/mask, either IPv4 or IPv6. We know that colons * will only appear in IPv6 addresses, so... */ if (strspn(aclstr, "0123456789ABCDEFabcdef.:") != strlen(aclstr)) { errno = EINVAL; return NULL; } acl->addr = pr_netaddr_get_addr(p, aclstr, NULL); if (!acl->addr) return NULL; /* Determine what the given bitmask is. */ acl->masklen = strtol(cp + 1, &tmp, 10); if (tmp && *tmp) { /* Invalid bitmask syntax. */ errno = EINVAL; return NULL; } *cp = '/'; /* Make sure the given mask length is appropriate for the address. */ switch (pr_netaddr_get_family(acl->addr)) { case AF_INET: { /* Make sure that the given number of bits is not more than supported * for IPv4 addresses (32). */ if (acl->masklen > 32) { errno = EINVAL; return NULL; } break; } #ifdef PR_USE_IPV6 case AF_INET6: { /* Make sure that the given number of bits is not more than supported * for IPv6 addresses (128). */ if (acl->masklen > 128) { errno = EINVAL; return NULL; } break; } #endif /* PR_USE_IPV6 */ default: break; } #ifdef PR_USE_IPV6 } else if (strspn(aclstr, "0123456789ABCDEFabcdef.:") != strlen(aclstr)) { #else } else if (strspn(aclstr, "0123456789.") != strlen(aclstr)) { #endif /* PR_USE_IPV6 */ /* Check if the given rule is negated. */ if (*aclstr == '!') { acl->negated = TRUE; aclstr++; } /* If there are any glob characters (e.g. '{', '[', '*', or '?'), or if the * first character is a '.', then treat the rule as a glob. */ if (strpbrk(aclstr, "{[*?")) { acl->type = PR_NETACL_TYPE_DNSGLOB; acl->pattern = pstrdup(p, aclstr); } else if (*aclstr == '.') { acl->type = PR_NETACL_TYPE_DNSGLOB; acl->pattern = pstrcat(p, "*", aclstr, NULL); } else { acl->type = PR_NETACL_TYPE_DNSMATCH; acl->pattern = pstrdup(p, aclstr); } } else { /* Check if the given rule is negated. */ if (*aclstr == '!') { acl->negated = TRUE; aclstr++; } /* If the last character is a '.', then treat the rule as a glob. */ if (aclstr[strlen(aclstr)-1] == '.') { acl->type = PR_NETACL_TYPE_IPGLOB; acl->pattern = pstrcat(p, aclstr, "*", NULL); } else { acl->type = PR_NETACL_TYPE_IPMATCH; acl->addr = pr_netaddr_get_addr(p, aclstr, NULL); if (!acl->addr) return NULL; } } return acl; } pr_netacl_t *pr_netacl_dup(pool *p, pr_netacl_t *acl) { pr_netacl_t *acl2; if (!p || !acl) { errno = EINVAL; return NULL; } acl2 = pcalloc(p, sizeof(pr_netacl_t)); /* A simple memcpy(3) won't suffice; we need a deep copy. */ acl2->type = acl->type; if (acl->pattern) acl2->pattern = pstrdup(p, acl->pattern); acl2->negated = acl->negated; if (acl->addr) { acl2->addr = pr_netaddr_alloc(p); pr_netaddr_set_family(acl2->addr, pr_netaddr_get_family(acl->addr)); pr_netaddr_set_sockaddr(acl2->addr, pr_netaddr_get_sockaddr(acl->addr)); } acl2->masklen = acl->masklen; return acl2; } int pr_netacl_get_negated(pr_netacl_t *acl) { if (!acl) { errno = EINVAL; return -1; } return acl->negated; }