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Diffstat (limited to 'scan_lists.cc')
| -rw-r--r-- | scan_lists.cc | 614 |
1 files changed, 614 insertions, 0 deletions
diff --git a/scan_lists.cc b/scan_lists.cc new file mode 100644 index 0000000..8d5e345 --- /dev/null +++ b/scan_lists.cc @@ -0,0 +1,614 @@ +/*************************************************************************** + * 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) 1996-2023 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 <nbase.h> + +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, IPPROTO_TCP)) { + porttbl[rangestart] |= SCAN_TCP_PORT; + } + if ((range_type & SCAN_UDP_PORT) && + nmap_getservbyport(rangestart, IPPROTO_UDP)) { + porttbl[rangestart] |= SCAN_UDP_PORT; + } + if ((range_type & SCAN_SCTP_PORT) && + nmap_getservbyport(rangestart, IPPROTO_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 */ + +} + |