/*************************************************************************** * scan_lists.cc -- Structures and functions for lists of ports to scan * * and scan types * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2022 Nmap Software LLC ("The Nmap * * Project"). Nmap is also a registered trademark of the Nmap Project. * * * * This program is distributed under the terms of the Nmap Public Source * * License (NPSL). The exact license text applying to a particular Nmap * * release or source code control revision is contained in the LICENSE * * file distributed with that version of Nmap or source code control * * revision. More Nmap copyright/legal information is available from * * https://nmap.org/book/man-legal.html, and further information on the * * NPSL license itself can be found at https://nmap.org/npsl/ . This * * header summarizes some key points from the Nmap license, but is no * * substitute for the actual license text. * * * * Nmap is generally free for end users to download and use themselves, * * including commercial use. It is available from https://nmap.org. * * * * The Nmap license generally prohibits companies from using and * * redistributing Nmap in commercial products, but we sell a special Nmap * * OEM Edition with a more permissive license and special features for * * this purpose. See https://nmap.org/oem/ * * * * If you have received a written Nmap license agreement or contract * * stating terms other than these (such as an Nmap OEM license), you may * * choose to use and redistribute Nmap under those terms instead. * * * * The official Nmap Windows builds include the Npcap software * * (https://npcap.com) for packet capture and transmission. It is under * * separate license terms which forbid redistribution without special * * permission. So the official Nmap Windows builds may not be * * redistributed without special permission (such as an Nmap OEM * * license). * * * * 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. * * * * Source code also allows you to port Nmap to new platforms, fix bugs, * * and add new features. You are highly encouraged to submit your * * changes as a Github PR or by email to the dev@nmap.org mailing list * * for possible incorporation into the main distribution. Unless you * * specify otherwise, it is understood that you are offering us very * * broad rights to use your submissions as described in the Nmap Public * * Source License Contributor Agreement. This is important because we * * fund the project by selling licenses with various terms, and also * * because the inability to relicense code has caused devastating * * problems for other Free Software projects (such as KDE and NASM). * * * * The free version of Nmap 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. Warranties, * * indemnification and commercial support are all available through the * * Npcap OEM program--see https://nmap.org/oem/ * * * ***************************************************************************/ /* Convert a string like "-100,n*tp,200-1024,3000-4000,[60000-]" into an array * of port numbers. Note that one trailing comma is OK -- this is actually * useful for machine generated lists * * Fyodor - Wrote original * William McVey - Added T:, U:, P: directives * Doug Hoyte - Added [], name lookups, and wildcard expansion * * getpts() handles [] * Any port ranges included inside square brackets will have all * their ports looked up in nmap-services or nmap-protocols * and will only be included if they are found. * Returns a scan_list* with all the ports that should be scanned. * * getpts() handles service/protocol name lookups and wildcard expansion. * The service name can be specified instead of the port number. * For example, "ssh" can be used instead of "22". You can use wildcards * like "*" and "?". See the function wildtest() for the exact details. * For example, * * nmap -p http* host * * Will scan http (80), http-mgmt (280), http-proxy (8080), https (443), etc. * * Matching is case INsensitive but the first character in a match MUST * be lowercase so it doesn't conflict with the T:, U:, and P: directives. * * getpts() is unable to match service names that start with a digit * like 3com-tsmux (106/udp). Use a pattern like "?com-*" instead. * * BE CAREFUL ABOUT SHELL EXPANSIONS!!! * If you are trying to match the services nmsp (537/tcp) and nms (1429/tcp) * and you execute the command * * ./nmap -p nm* host * * You will see * * Found no matches for the service mask 'nmap' and your specified protocols * QUITTING! * * This is because nm* was expanded to the name of the binary file nmap in * the current directory by your shell. When unsure, quote your port strings * to be safe: * * ./nmap -p 'nm*' host * * getpts() is smart enough to keep the T: U: and P: directives nested * and working in a logical manner. For instance, * * nmap -sTU -p [U:1025-],1-1024 host * * Will scan UDP ports 1025 and up that are found in the service file * and all TCP/UDP ports below <= 1024. Notice that the U doesn't affect * the outer part of the port expression. It's "closed". */ #include "scan_lists.h" #include "nmap_error.h" #include "NmapOps.h" #include "protocols.h" #include "services.h" #include extern NmapOps o; /* option structure */ static void getpts_aux(const char *origexpr, int nested, u8 *porttbl, int range_type, int *portwarning, bool change_range_type = true); void getpts(const char *origexpr, struct scan_lists *ports) { u8 *porttbl; int range_type = 0; int portwarning = 0; int i, tcpi, udpi, sctpi, proti; if (o.TCPScan()) range_type |= SCAN_TCP_PORT; if (o.UDPScan()) range_type |= SCAN_UDP_PORT; if (o.SCTPScan()) range_type |= SCAN_SCTP_PORT; if (o.ipprotscan) range_type |= SCAN_PROTOCOLS; if (o.noportscan && o.exclude_portlist) { // We want to exclude from ping scans in this case but we take port list normally and then removepts() handles it range_type |= SCAN_TCP_PORT; range_type |= SCAN_UDP_PORT; range_type |= SCAN_SCTP_PORT; } porttbl = (u8 *) safe_zalloc(65536); getpts_aux(origexpr, // Pass on the expression 0, // Don't start off nested porttbl, // Our allocated port table range_type, // Defaults to TCP/UDP/SCTP/Protos &portwarning); // No, we haven't warned them about dup ports yet ports->tcp_count = 0; ports->udp_count = 0; ports->sctp_count = 0; ports->prot_count = 0; for (i = 0; i <= 65535; i++) { if (porttbl[i] & SCAN_TCP_PORT) ports->tcp_count++; if (porttbl[i] & SCAN_UDP_PORT) ports->udp_count++; if (porttbl[i] & SCAN_SCTP_PORT) ports->sctp_count++; if (porttbl[i] & SCAN_PROTOCOLS && i < 256) ports->prot_count++; } if (range_type != 0 && 0 == (ports->tcp_count + ports->udp_count + ports->sctp_count + ports->prot_count)) fatal("No ports specified -- If you really don't want to scan any ports use ping scan..."); if (ports->tcp_count) { ports->tcp_ports = (unsigned short *)safe_zalloc(ports->tcp_count * sizeof(unsigned short)); } if (ports->udp_count) { ports->udp_ports = (unsigned short *)safe_zalloc(ports->udp_count * sizeof(unsigned short)); } if (ports->sctp_count) { ports->sctp_ports = (unsigned short *)safe_zalloc(ports->sctp_count * sizeof(unsigned short)); } if (ports->prot_count) { ports->prots = (unsigned short *)safe_zalloc(ports->prot_count * sizeof(unsigned short)); } for (i = tcpi = udpi = sctpi = proti = 0; i <= 65535; i++) { if (porttbl[i] & SCAN_TCP_PORT) ports->tcp_ports[tcpi++] = i; if (porttbl[i] & SCAN_UDP_PORT) ports->udp_ports[udpi++] = i; if (porttbl[i] & SCAN_SCTP_PORT) ports->sctp_ports[sctpi++] = i; if (porttbl[i] & SCAN_PROTOCOLS && i < 256) ports->prots[proti++] = i; } free(porttbl); } /* This function is like getpts except it only allocates space for and stores values into one unsigned short array, instead of an entire scan_lists struct For that reason, T:, U:, S: and P: restrictions are not allowed and only one bit in range_type may be set. */ void getpts_simple(const char *origexpr, int range_type, unsigned short **list, int *count) { u8 *porttbl; int portwarning = 0; int i, j; /* Make sure that only one bit in range_type is set (or that range_type is 0, which is useless but not incorrect). */ assert((range_type & (range_type - 1)) == 0); porttbl = (u8 *) safe_zalloc(65536); /* Get the ports but do not allow changing the type with T:, U:, or P:. */ getpts_aux(origexpr, 0, porttbl, range_type, &portwarning, false); /* Count how many are set. */ *count = 0; for (i = 0; i <= 65535; i++) { if (porttbl[i] & range_type) (*count)++; } if (*count == 0) { free(porttbl); return; } *list = (unsigned short *) safe_zalloc(*count * sizeof(unsigned short)); /* Fill in the list. */ for (i = 0, j = 0; i <= 65535; i++) { if (porttbl[i] & range_type) (*list)[j++] = i; } free(porttbl); } /* removepts() takes a port specification and removes any matching ports from the given scan_lists struct. */ static int remaining_ports(unsigned short int *ports, int count, unsigned short int *exclude_ports, int exclude_count, const char *type = ""); void removepts(const char *expr, struct scan_lists * ports) { static struct scan_lists exclude_ports; if (!expr) return; getpts(expr, &exclude_ports); #define SUBTRACT_PORTS(type,excludetype) \ ports->type##_count = remaining_ports(ports->type##_ports, \ ports->type##_count, \ exclude_ports.excludetype##_ports, \ exclude_ports.excludetype##_count, \ #type) SUBTRACT_PORTS(tcp, tcp); SUBTRACT_PORTS(udp, udp); SUBTRACT_PORTS(sctp, sctp); SUBTRACT_PORTS(syn_ping, tcp); SUBTRACT_PORTS(ack_ping, tcp); SUBTRACT_PORTS(udp_ping, udp); SUBTRACT_PORTS(sctp_ping, sctp); #define prot_ports prots SUBTRACT_PORTS(prot, prot); SUBTRACT_PORTS(proto_ping, prot); #undef prot_ports #undef SUBTRACT_PORTS free_scan_lists(&exclude_ports); } /* This function returns the number of ports that remain after the excluded ports are removed from the ports. It places these ports at the start of the ports array. */ static int remaining_ports(unsigned short int *ports, int count, unsigned short int *exclude_ports, int exclude_count, const char *type) { static bool has_been_excluded[65536]; int i, j; if (count == 0 || exclude_count == 0) return count; if (o.debugging > 1) log_write(LOG_STDOUT, "Removed %s ports: ", type); for (i = 0; i < 65536; i++) has_been_excluded[i] = false; for (i = 0; i < exclude_count; i++) has_been_excluded[exclude_ports[i]] = true; for (i = 0, j = 0; i < count; i++) if (!has_been_excluded[ports[i]]) ports[j++] = ports[i]; else if (o.debugging > 1) log_write(LOG_STDOUT, "%d ", ports[i]); if (o.debugging > 1) { if (count-j) { log_write(LOG_STDOUT, "\n"); } else { log_write(LOG_STDOUT, "None\n"); } } if (o.debugging && count-j) { log_write(LOG_STDOUT, "Removed %d %s ports that would have been considered for scanning otherwise.\n", count-j, type); } return j; } /* getpts() and getpts_simple() (see above) are wrappers for this function */ static void getpts_aux(const char *origexpr, int nested, u8 *porttbl, int range_type, int *portwarning, bool change_range_type) { long rangestart = -2343242, rangeend = -9324423; const char *current_range; char *endptr; char servmask[128]; // A protocol name can be up to 127 chars + nul byte int i; /* An example of proper syntax to use in error messages. */ const char *syntax_example; if (change_range_type) syntax_example = "-100,200-1024,T:3000-4000,U:60000-"; else syntax_example = "-100,200-1024,3000-4000,60000-"; current_range = origexpr; do { while (isspace((int) (unsigned char) *current_range)) current_range++; /* I don't know why I should allow spaces here, but I will */ if (change_range_type && *(current_range+1) == ':') { switch (*current_range) { case 'T': range_type = SCAN_TCP_PORT; break; case 'U': range_type = SCAN_UDP_PORT; break; case 'S': range_type = SCAN_SCTP_PORT; break; case 'P': range_type = SCAN_PROTOCOLS; break; default: fatal("Error parsing port list: Unknown protocol specifier '%c'.", *current_range); break; } current_range += 2; continue; } if (*current_range == '[') { if (nested) fatal("Can't nest [] brackets in port/protocol specification"); getpts_aux(++current_range, 1, porttbl, range_type, portwarning); // Skip past the ']'. This is OK because we can't nest []s while (*current_range != ']' && *current_range != '\0') current_range++; if (*current_range == ']') current_range++; // Skip over a following ',' so we're ready to keep parsing if (*current_range == ',') current_range++; continue; } else if (*current_range == ']') { if (!nested) fatal("Unexpected ] character in port/protocol specification"); return; } else if (*current_range == '-') { if (range_type & SCAN_PROTOCOLS) rangestart = 0; else rangestart = 1; } else if (isdigit((int) (unsigned char) *current_range)) { rangestart = strtol(current_range, &endptr, 10); if (range_type & SCAN_PROTOCOLS) { if (rangestart < 0 || rangestart > 255) fatal("Protocols specified must be between 0 and 255 inclusive"); } else { if (rangestart < 0 || rangestart > 65535) fatal("Ports specified must be between 0 and 65535 inclusive"); } current_range = endptr; while (isspace((int) (unsigned char) *current_range)) current_range++; } else if (islower((int) (unsigned char) *current_range) || *current_range == '*' || *current_range == '?') { i = 0; while (*current_range && !isspace((int) (unsigned char) *current_range) && *current_range != ',' && *current_range != ']') { servmask[i++] = *(current_range++); if (i >= ((int)sizeof(servmask) - 1)) fatal("A service mask in the port/protocol specification is either malformed or too long"); } if (*current_range && *current_range != ']') current_range++; // We want the '] character to be picked up on the next pass servmask[i] = '\0'; // Finish the string i = addportsfromservmask(servmask, porttbl, range_type); if (range_type & SCAN_PROTOCOLS) i += addprotocolsfromservmask(servmask, porttbl); if (i == 0) fatal("Found no matches for the service mask '%s' and your specified protocols", servmask); continue; } else { fatal("Error #485: Your port specifications are illegal. Example of proper form: \"%s\"", syntax_example); } /* Now I have a rangestart, time to go after rangeend */ if (!*current_range || *current_range == ',' || *current_range == ']') { /* Single port specification */ rangeend = rangestart; } else if (*current_range == '-') { current_range++; if (!*current_range || *current_range == ',' || *current_range == ']') { /* Ended with a -, meaning up until the last possible port */ if (range_type & SCAN_PROTOCOLS) rangeend = 255; else rangeend = 65535; } else if (isdigit((int) (unsigned char) *current_range)) { rangeend = strtol(current_range, &endptr, 10); if (range_type & SCAN_PROTOCOLS) { if (rangeend < 0 || rangeend > 255) fatal("Protocols specified must be between 0 and 255 inclusive"); } else { if (rangeend < 0 || rangeend > 65535) fatal("Ports specified must be between 0 and 65535 inclusive"); } current_range = endptr; } else { fatal("Error #486: Your port specifications are illegal. Example of proper form: \"%s\"", syntax_example); } if (rangeend < rangestart) { fatal("Your %s range %ld-%ld is backwards. Did you mean %ld-%ld?", (range_type & SCAN_PROTOCOLS) ? "protocol" : "port", rangestart, rangeend, rangeend, rangestart); } } else { fatal("Error #487: Your port specifications are illegal. Example of proper form: \"%s\"", syntax_example); } /* Now I have a rangestart and a rangeend, so I can add these ports */ while (rangestart <= rangeend) { if (porttbl[rangestart] & range_type) { if (!(*portwarning)) { error("WARNING: Duplicate port number(s) specified. Are you alert enough to be using Nmap? Have some coffee or Jolt(tm)."); (*portwarning)++; } } else { if (nested) { if ((range_type & SCAN_TCP_PORT) && nmap_getservbyport(rangestart, "tcp")) { porttbl[rangestart] |= SCAN_TCP_PORT; } if ((range_type & SCAN_UDP_PORT) && nmap_getservbyport(rangestart, "udp")) { porttbl[rangestart] |= SCAN_UDP_PORT; } if ((range_type & SCAN_SCTP_PORT) && nmap_getservbyport(rangestart, "sctp")) { porttbl[rangestart] |= SCAN_SCTP_PORT; } if ((range_type & SCAN_PROTOCOLS) && nmap_getprotbynum(rangestart)) { porttbl[rangestart] |= SCAN_PROTOCOLS; } } else { porttbl[rangestart] |= range_type; } } rangestart++; } /* Find the next range */ while (isspace((int) (unsigned char) *current_range)) current_range++; if (*current_range == ']') { if (!nested) fatal("Unexpected ] character in port/protocol specification"); return; } if (*current_range && *current_range != ',') { fatal("Error #488: Your port specifications are illegal. Example of proper form: \"%s\"", syntax_example); } if (*current_range == ',') current_range++; } while (current_range && *current_range); } void free_scan_lists(struct scan_lists *ports) { if (ports->tcp_ports) free(ports->tcp_ports); if (ports->udp_ports) free(ports->udp_ports); if (ports->sctp_ports) free(ports->sctp_ports); if (ports->prots) free(ports->prots); if (ports->syn_ping_ports) free(ports->syn_ping_ports); if (ports->ack_ping_ports) free(ports->ack_ping_ports); if (ports->udp_ping_ports) free(ports->udp_ping_ports); if (ports->proto_ping_ports) free(ports->proto_ping_ports); } /* Just a routine for obtaining a string for printing based on the scantype */ const char *scantype2str(stype scantype) { switch (scantype) { case STYPE_UNKNOWN: return "Unknown Scan Type"; break; case HOST_DISCOVERY: return "Host Discovery"; break; case ACK_SCAN: return "ACK Scan"; break; case SYN_SCAN: return "SYN Stealth Scan"; break; case FIN_SCAN: return "FIN Scan"; break; case XMAS_SCAN: return "XMAS Scan"; break; case UDP_SCAN: return "UDP Scan"; break; case CONNECT_SCAN: return "Connect Scan"; break; case NULL_SCAN: return "NULL Scan"; break; case WINDOW_SCAN: return "Window Scan"; break; case SCTP_INIT_SCAN: return "SCTP INIT Scan"; break; case SCTP_COOKIE_ECHO_SCAN: return "SCTP COOKIE-ECHO Scan"; break; case MAIMON_SCAN: return "Maimon Scan"; break; case IPPROT_SCAN: return "IPProto Scan"; break; case PING_SCAN: return "Ping Scan"; break; case PING_SCAN_ARP: return "ARP Ping Scan"; break; case PING_SCAN_ND: return "ND Ping Scan"; break; case IDLE_SCAN: return "Idle Scan"; break; case BOUNCE_SCAN: return "Bounce Scan"; break; case SERVICE_SCAN: return "Service Scan"; break; case OS_SCAN: return "OS Scan"; break; case SCRIPT_PRE_SCAN: return "Script Pre-Scan"; break; case SCRIPT_SCAN: return "Script Scan"; break; case SCRIPT_POST_SCAN: return "Script Post-Scan"; break; case TRACEROUTE: return "Traceroute" ; break; default: assert(0); break; } return NULL; /* Unreached */ }