/*************************************************************************** * targets.cc -- Functions related to determining the exact IPs to hit * * based on CIDR and other input formats and handling the exclude-file * * option. nexthost function is tailored to Ncrack's needs that avoids * * using HostGroups. * * * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2011 Insecure.Com LLC. Nmap is * * also a registered trademark of Insecure.Com LLC. This program is free * * software; you may redistribute and/or modify it under the terms of the * * GNU General Public License as published by the Free Software * * Foundation; Version 2 with the clarifications and exceptions described * * below. This guarantees your right to use, modify, and redistribute * * this software under certain conditions. If you wish to embed Nmap * * technology into proprietary software, we sell alternative licenses * * (contact sales@insecure.com). Dozens of software vendors already * * license Nmap technology such as host discovery, port scanning, OS * * detection, and version detection. * * * * Note that the GPL places important restrictions on "derived works", yet * * it does not provide a detailed definition of that term. To avoid * * misunderstandings, we consider an application to constitute a * * "derivative work" for the purpose of this license if it does any of the * * following: * * o Integrates source code from Nmap * * o Reads or includes Nmap copyrighted data files, such as * * nmap-os-db or nmap-service-probes. * * o Executes Nmap and parses the results (as opposed to typical shell or * * execution-menu apps, which simply display raw Nmap output and so are * * not derivative works.) * * o Integrates/includes/aggregates Nmap into a proprietary executable * * installer, such as those produced by InstallShield. * * o Links to a library or executes a program that does any of the above * * * * The term "Nmap" should be taken to also include any portions or derived * * works of Nmap. This list is not exclusive, but is meant to clarify our * * interpretation of derived works with some common examples. Our * * interpretation applies only to Nmap--we don't speak for other people's * * GPL works. * * * * If you have any questions about the GPL licensing restrictions on using * * Nmap in non-GPL works, we would be happy to help. As mentioned above, * * we also offer alternative license to integrate Nmap into proprietary * * applications and appliances. These contracts have been sold to dozens * * of software vendors, and generally include a perpetual license as well * * as providing for priority support and updates as well as helping to * * fund the continued development of Nmap technology. Please email * * sales@insecure.com for further information. * * * * As a special exception to the GPL terms, Insecure.Com LLC grants * * permission to link the code of this program with any version of the * * OpenSSL library which is distributed under a license identical to that * * listed in the included docs/licenses/OpenSSL.txt file, and distribute * * linked combinations including the two. You must obey the GNU GPL in all * * respects for all of the code used other than OpenSSL. If you modify * * this file, you may extend this exception to your version of the file, * * but you are not obligated to do so. * * * * If you received these files with a written license agreement or * * contract stating terms other than the terms above, then that * * alternative license agreement takes precedence over these comments. * * * * Source is provided to this software because we believe users have a * * right to know exactly what a program is going to do before they run it. * * This also allows you to audit the software for security holes (none * * have been found so far). * * * * Source code also allows you to port Nmap to new platforms, fix bugs, * * and add new features. You are highly encouraged to send your changes * * to nmap-dev@insecure.org for possible incorporation into the main * * distribution. By sending these changes to Fyodor or one of the * * Insecure.Org development mailing lists, it is assumed that you are * * offering the Nmap Project (Insecure.Com LLC) the unlimited, * * non-exclusive right to reuse, modify, and relicense the code. Nmap * * will always be available Open Source, but this is important because the * * inability to relicense code has caused devastating problems for other * * Free Software projects (such as KDE and NASM). We also occasionally * * relicense the code to third parties as discussed above. If you wish to * * specify special license conditions of your contributions, just say so * * when you send them. * * * * 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 v2.0 for more details at * * http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file * * included with Nmap. * * * ***************************************************************************/ /* $Id: targets.cc 12955 2009-04-15 00:37:03Z fyodor $ */ #include "ncrack.h" #include "targets.h" #include "TargetGroup.h" #include "Service.h" #include "Target.h" #include "NcrackOps.h" #include "utils.h" extern NcrackOps o; using namespace std; /* Gets the host number (index) of target in the hostbatch array of pointers. Note that the target MUST EXIST in the array or all heck will break loose. */ static inline int gethostnum(Target *hostbatch[], Target *target) { int i = 0; do { if (hostbatch[i] == target) return i; } while(++i); fatal("fluxx0red"); return 0; // Unreached } /* Is the host passed as Target to be excluded, much of this logic had (mdmcl) * to be rewritten from wam's original code to allow for the objects */ static int hostInExclude(struct sockaddr *checksock, size_t checksocklen, TargetGroup *exclude_group) { unsigned long tmpTarget; /* ip we examine */ int i=0; /* a simple index */ char targets_type; /* what is the address type of the Target Group */ struct sockaddr_storage ss; struct sockaddr_in *sin = (struct sockaddr_in *) &ss; size_t slen; /* needed for funct but not used */ unsigned long mask = 0; /* our trusty netmask, which we convert to nbo */ struct sockaddr_in *checkhost; if ((TargetGroup *)0 == exclude_group) return 0; assert(checksocklen >= sizeof(struct sockaddr_in)); checkhost = (struct sockaddr_in *) checksock; if (checkhost->sin_family != AF_INET) checkhost = NULL; /* First find out what type of addresses are in the target group */ targets_type = exclude_group[i].get_targets_type(); /* Lets go through the targets until we reach our uninitialized placeholder */ while (exclude_group[i].get_targets_type() != TargetGroup::TYPE_NONE) { /* while there are still hosts in the target group */ while (exclude_group[i].get_next_host(&ss, &slen) == 0) { tmpTarget = sin->sin_addr.s_addr; /* For Netmasks simply compare the network bits and move to the next * group if it does not compare, we don't care about the individual addrs */ if (targets_type == TargetGroup::IPV4_NETMASK) { mask = htonl((unsigned long) (0-1) << (32-exclude_group[i].get_mask())); if ((tmpTarget & mask) == (checkhost->sin_addr.s_addr & mask)) { exclude_group[i].rewind(); return 1; } else { break; } } /* For ranges we need to be a little more slick, if we don't find a match * we should skip the rest of the addrs in the octet, thank wam for this * optimization */ else if (targets_type == TargetGroup::IPV4_RANGES) { if (tmpTarget == checkhost->sin_addr.s_addr) { exclude_group[i].rewind(); return 1; } else { /* note these are in network byte order */ if ((tmpTarget & 0x000000ff) != (checkhost->sin_addr.s_addr & 0x000000ff)) exclude_group[i].skip_range(TargetGroup::FIRST_OCTET); else if ((tmpTarget & 0x0000ff00) != (checkhost->sin_addr.s_addr & 0x0000ff00)) exclude_group[i].skip_range(TargetGroup::SECOND_OCTET); else if ((tmpTarget & 0x00ff0000) != (checkhost->sin_addr.s_addr & 0x00ff0000)) exclude_group[i].skip_range(TargetGroup::THIRD_OCTET); continue; } } #if HAVE_IPV6 else if (targets_type == TargetGroup::IPV6_ADDRESS) { fatal("exclude file not supported for IPV6 -- If it is important to you, send a mail to fyodor@insecure.org so I can guage support\n"); } #endif } exclude_group[i++].rewind(); } /* we did not find the host */ return 0; } /* loads an exclude file into an exclude target list (mdmcl) */ TargetGroup* load_exclude(FILE *fExclude, char *szExclude) { int i=0; /* loop counter */ int iLine=0; /* line count */ int iListSz=0; /* size of our exclude target list. * It doubles in size as it gets * close to filling up */ char acBuf[512]; char *p_acBuf; TargetGroup *excludelist; /* list of ptrs to excluded targets */ char *pc; /* the split out exclude expressions */ char b_file = (char)0; /* flag to indicate if we are using a file */ /* If there are no params return now with a NULL list */ if (((FILE *)0 == fExclude) && ((char *)0 == szExclude)) { excludelist=NULL; return excludelist; } if ((FILE *)0 != fExclude) b_file = (char)1; /* Since I don't know of a realloc equiv in C++, we will just count * the number of elements here. */ /* If the input was given to us in a file, count the number of elements * in the file, and reset the file */ if (1 == b_file) { while ((char *)0 != fgets(acBuf,sizeof(acBuf), fExclude)) { /* the last line can contain no newline, then we have to check for EOF */ if ((char *)0 == strchr(acBuf, '\n') && !feof(fExclude)) { fatal("Exclude file line %d was too long to read. Exiting.", iLine); } pc=strtok(acBuf, "\t\n "); while (NULL != pc) { iListSz++; pc=strtok(NULL, "\t\n "); } } rewind(fExclude); } /* If the exclude file was provided via command line, count the elements here */ else { p_acBuf=strdup(szExclude); pc=strtok(p_acBuf, ","); while (NULL != pc) { iListSz++; pc=strtok(NULL, ","); } free(p_acBuf); p_acBuf = NULL; } /* allocate enough TargetGroups to cover our entries, plus one that * remains uninitialized so we know we reached the end */ excludelist = new TargetGroup[iListSz + 1]; /* don't use a for loop since the counter isn't incremented if the * exclude entry isn't parsed */ i=0; if (1 == b_file) { /* If we are parsing a file load the exclude list from that */ while ((char *)0 != fgets(acBuf, sizeof(acBuf), fExclude)) { ++iLine; if ((char *)0 == strchr(acBuf, '\n') && !feof(fExclude)) { fatal("Exclude file line %d was too long to read. Exiting.", iLine); } pc=strtok(acBuf, "\t\n "); while ((char *)0 != pc) { if(excludelist[i].parse_expr(pc,o.af()) == 0) { if (o.debugging > 1) error("Loaded exclude target of: %s", pc); ++i; } pc=strtok(NULL, "\t\n "); } } } else { /* If we are parsing command line, load the exclude file from the string */ p_acBuf=strdup(szExclude); pc=strtok(p_acBuf, ","); while (NULL != pc) { if(excludelist[i].parse_expr(pc,o.af()) == 0) { if (o.debugging >1) error("Loaded exclude target of: %s", pc); ++i; } /* This is a totally cheezy hack, but since I can't use strtok_r... * If you can think of a better way to do this, feel free to change. * As for now, we will reset strtok each time we leave parse_expr */ { int hack_i; char *hack_c = strdup(szExclude); pc=strtok(hack_c, ","); for (hack_i = 0; hack_i < i; hack_i++) pc=strtok(NULL, ","); free(hack_c); } } } return excludelist; } /* A debug routine to dump some information to stdout. (mdmcl) * Invoked if debugging is set to 3 or higher * I had to make signigicant changes from wam's code. Although wam * displayed much more detail, alot of this is now hidden inside * of the Target Group Object. Rather than writing a bunch of methods * to return private attributes, which would only be used for * debugging, I went for the method below. */ int dumpExclude(TargetGroup *exclude_group) { int i=0, debug_save=0, type=TargetGroup::TYPE_NONE; unsigned int mask = 0; struct sockaddr_storage ss; struct sockaddr_in *sin = (struct sockaddr_in *) &ss; size_t slen; /* shut off debugging for now, this is a debug routine in itself, * we don't want to see all the debug messages inside of the object */ debug_save = o.debugging; o.debugging = 0; while ((type = exclude_group[i].get_targets_type()) != TargetGroup::TYPE_NONE) { switch (type) { case TargetGroup::IPV4_NETMASK: exclude_group[i].get_next_host(&ss, &slen); mask = exclude_group[i].get_mask(); error("exclude host group %d is %s/%d\n", i, inet_ntoa(sin->sin_addr), mask); break; case TargetGroup::IPV4_RANGES: while (exclude_group[i].get_next_host(&ss, &slen) == 0) error("exclude host group %d is %s\n", i, inet_ntoa(sin->sin_addr)); break; case TargetGroup::IPV6_ADDRESS: fatal("IPV6 addresses are not supported in the exclude file\n"); break; default: fatal("Unknown target type in exclude file.\n"); } exclude_group[i++].rewind(); } /* return debugging to what it was */ o.debugging = debug_save; return 1; } Target * nexthost(const char *expr, TargetGroup *exclude_group) { struct sockaddr_storage ss; size_t sslen; Target *host; static TargetGroup group; static bool newexp = true; /* true for new expression */ if (newexp) { group = TargetGroup(); group.parse_expr(expr, o.af()); newexp = false; } /* Skip any hosts the user asked to exclude */ do { if (group.get_next_host(&ss, &sslen)) { /* no more targets */ newexp = true; return NULL; } } while (hostInExclude((struct sockaddr *)&ss, sslen, exclude_group)); host = new Target(); host->setTargetSockAddr(&ss, sslen); /* put target expression in target if we have a named host without netmask */ if (group.get_targets_type() == TargetGroup::IPV4_NETMASK && group.get_namedhost() && !strchr(expr, '/' )) { host->setTargetName(expr); } return host; }