├── LICENSE ├── README.md └── netcredz.py /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # NetCredz 2 | 3 | NetCredz is a lightweight, dependency-free tool for extracting cleartext 4 | credentials and authentication data from network traffic. Inspired by 5 | [PCredz](https://github.com/lgandx/PCredz), it provides enhanced functionality 6 | while maintaining simplicity and efficiency. 7 | 8 | # Features 9 | 10 | - Parse pcap files or listen on live network interfaces. 11 | - Filter traffic by specific protocols to reduce clutter. 12 | - Support for regex filtering to search for specific patterns or strings. 13 | - Output results to a log file for easy analysis. 14 | 15 | # Install 16 | 17 | ```sh 18 | git clone https://github.com/joey-melo/netcredz.git 19 | ``` 20 | 21 | # Usage 22 | 23 | Run with a pcap file: 24 | 25 | ```sh 26 | python3 netcredz -f capture.pcap 27 | ``` 28 | 29 | Run on a live network interface: 30 | 31 | ```sh 32 | python3 netcredz -i eth0 33 | ``` 34 | 35 | ## Options 36 | 37 | ``` 38 | options: 39 | -h, --help show this help message and exit 40 | -i INTERFACE, --interface INTERFACE 41 | interface 42 | -f FILE, --file FILE pcap file path 43 | -d, --debug debug mode 44 | -v, --verbose verbosity level 45 | -c FILTERS, --capture-methods FILTERS 46 | capture methods 47 | -r REGEX, --regex REGEX 48 | regex string 49 | -o OUTPUT, --output OUTPUT 50 | output log file path (csv) 51 | ``` 52 | 53 | ## Supported Protocol 54 | 55 | NetCredz supports the following protocols for filtering: 56 | 57 | ``` 58 | ntlm, ldap, http, smtp, snmp, telnet, ftp, kerberos, dhcpv6, llmnr 59 | ``` 60 | 61 | # Future Enhancements 62 | 63 | - Implement remote logging to send captured data to a listening server. 64 | - Implement python2 version for backward compatibility. 65 | -------------------------------------------------------------------------------- /netcredz.py: -------------------------------------------------------------------------------- 1 | # NetCredz v0.0.1 - alpha 2 | # Created by Joey Melo - Inspired by Pcredz from Laurent Gaffie https://github.com/lgandx/PCredz/ 3 | # 4 | # This program is free software: you can redistribute it and/or modify 5 | # it under the terms of the GNU General Public License as published by 6 | # the Free Software Foundation, either version 3 of the License, or 7 | # (at your option) any later version. 8 | # 9 | # This program is distributed in the hope that it will be useful, 10 | # but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 | # GNU General Public License for more details. 13 | # 14 | # You should have received a copy of the GNU General Public License 15 | # along with this program. If not, see . 16 | 17 | import socket 18 | import struct 19 | import re 20 | from urllib.parse import unquote 21 | import argparse, sys 22 | import traceback 23 | from base64 import b64decode 24 | import time 25 | import hashlib 26 | import codecs 27 | 28 | CAPTURE_PROTOCOLS = [ 29 | "ntlm", 30 | "ldap", 31 | "http", 32 | "smtp", 33 | "snmp", 34 | "telnet", 35 | "ftp", 36 | "kerberos", 37 | "dhcpv6", 38 | "llmnr" 39 | ] 40 | 41 | class InvalidProtocolException(Exception): 42 | def __init__(self, protocol): 43 | self._protocol = protocol 44 | super().__init__(f"Invalid capture filter: \"{protocol}\". Valid options are {','.join(CAPTURE_PROTOCOLS)}") 45 | 46 | class Color: 47 | def __init__(self): 48 | self.RED = "\033[31m" 49 | self.GREEN = "\033[32m" 50 | self.YELLOW = "\033[33m" 51 | self.BLUE = "\033[34m" 52 | self.PURPLE = "\033[35m" 53 | self.RESET = "\033[0m" 54 | 55 | class Logger: 56 | def __init__(self, verbosity: int, debug: bool): 57 | self._verbosity = verbosity 58 | self._debug = debug 59 | self._color = Color() 60 | 61 | def error(self, string: str, verbosity = 1): 62 | if self._verbosity >= verbosity: 63 | print(self._color.RED + "[X] " + self._color.RESET + string) 64 | if self._debug: 65 | print(self._color.PURPLE + "[DEBUG] " + self._color.RESET + traceback.format_exc()) 66 | 67 | def success(self, string: str, verbosity = 0): 68 | if self._verbosity >= verbosity: 69 | print(self._color.GREEN + "[+] " + self._color.RESET + string) 70 | 71 | def fail(self, string: str, verbosity = 0): 72 | if self._verbosity >= verbosity: 73 | print(self._color.YELLOW + "[-] " + self._color.RESET + string) 74 | 75 | def info(self, string: str, verbosity = 0): 76 | if self._verbosity >= verbosity: 77 | print(self._color.BLUE + "[*] " + self._color.RESET + string) 78 | 79 | def plain(self, string: str, verbosity = 0): 80 | if self._verbosity >= verbosity: 81 | print(string) 82 | elif self._verbosity == 1: 83 | print(self._color.YELLOW + "[!] " + self._color.RESET + "Skipping data previously captured. Increase verbosity (-v) or check log file to display data.") 84 | 85 | class Capture: 86 | def __init__(self, interface: str, filters: list, regex: str): 87 | self._interface = interface 88 | self._filters = CAPTURE_PROTOCOLS if "all" in filters else filters 89 | self._parser_map = {} 90 | self._parser_map.update({protocol: "parse_" + protocol for protocol in CAPTURE_PROTOCOLS if protocol != "all"}) 91 | self._seen_packets = {} 92 | self._regex = regex 93 | 94 | try: 95 | self._socket = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(0x0003)) 96 | self._socket.bind((self._interface, 0)) 97 | except PermissionError: 98 | log.fail("Administrative privileges are required capture traffic.") 99 | exit(1) 100 | except Exception as e: 101 | log.error(str(e)) 102 | return None 103 | 104 | def _is_duplicate(self, packet): 105 | packet_hash = hashlib.sha256(packet).hexdigest() 106 | current_time = time.time() 107 | 108 | # Remove entries from the cache older than 5 seconds 109 | for h in list(self._seen_packets): 110 | if current_time - self._seen_packets[h] > 5: 111 | del self._seen_packets[h] 112 | 113 | if packet_hash in self._seen_packets: 114 | return True 115 | else: 116 | self._seen_packets[packet_hash] = current_time 117 | return False 118 | 119 | def _parse_packet(self, packet): 120 | # Skip duplicate packets 121 | try: 122 | if self._is_duplicate(packet): 123 | return 124 | 125 | packet_parser = PacketParser(packet) 126 | for protocol in self._filters: 127 | method = self._parser_map[protocol] 128 | parse = getattr(packet_parser, method) 129 | parse() 130 | if self._regex: 131 | packet_parser.parse_regex(self._regex) 132 | 133 | except KeyboardInterrupt: 134 | exit() 135 | 136 | except TypeError: 137 | log.error("TypeError occurred while parsing packet - likely NoneType error with re.findall") 138 | return 139 | 140 | except AttributeError: 141 | log.error("AttributeError occurred while parsing packet - likely an error with re.findall") 142 | return 143 | 144 | except UnboundLocalError: 145 | log.error("UnboundLocalError occurred while parsing packet - src_port likely not found") 146 | return 147 | 148 | except Exception as e: 149 | log.error(str(e)) 150 | 151 | def listen(self): 152 | while True: 153 | packet, _ = self._socket.recvfrom(0x10000) 154 | self._parse_packet(packet) 155 | 156 | def parse_file(self, pcap_file): 157 | pcap_header = pcap_file[:24] 158 | magic_number = struct.unpack('I', pcap_header[0:4])[0] 159 | 160 | # Check if file is PCAP format 161 | if magic_number != 0xa1b2c3d4: 162 | log.fail("Invalid PCAP file format") 163 | exit(1) 164 | 165 | offset = 24 # Skip global header 166 | while offset < len(pcap_file): 167 | packet_header = pcap_file[offset:offset+16] 168 | packet_len = struct.unpack('I', packet_header[8:12])[0] 169 | 170 | packet_data = pcap_file[offset+16:offset+16+packet_len] 171 | 172 | self._parse_packet(packet_data) 173 | 174 | offset += 16 + packet_len 175 | 176 | class PacketParser: 177 | def __init__(self, packet): 178 | self._src_port = None 179 | self._dest_port = None 180 | self._data = None 181 | self._src_ip = None 182 | self._dest_ip = None 183 | self._traffic = None 184 | 185 | dest_mac, src_mac, eth_type, frame_data = self._parse_ethernet_frame(packet) 186 | 187 | # IPv4 188 | if eth_type == 0x08: 189 | 190 | version, header_length, ttl, protocol, src_ip, dest_ip, data = self._parse_ipv4_packet(frame_data) 191 | self._src_ip = src_ip 192 | self._dest_ip = dest_ip 193 | 194 | # TCP 195 | if protocol == 0x06: 196 | src_port, dest_port, payload = self._parse_tcp_packet(data) 197 | 198 | # UDP 199 | elif protocol == 0x11: 200 | src_port, dest_port, payload = self._parse_udp_packet(data) 201 | 202 | self._src_port = src_port 203 | self._dest_port = dest_port 204 | self._data = payload 205 | self._traffic = f"{self._src_ip}:{self._src_port} --> {self._dest_ip}:{self._dest_port}" 206 | 207 | # IPv6 -- to be implemented 208 | elif eth_type == 0x86DD: 209 | pass 210 | 211 | """ 212 | To Do: add support to these protocols 213 | protocols = { 214 | 6:'tcp', 215 | 17:'udp', 216 | 1:'icmp', 217 | 2:'igmp', 218 | 3:'ggp', 219 | 4:'ipcap', 220 | 5:'ipstream', 221 | 8:'egp', 222 | 9:'igrp', 223 | 29:'ipv6oipv4', 224 | } 225 | """ 226 | 227 | def _parse_ethernet_frame(self, frame): 228 | dest_mac, src_mac, eth_type = struct.unpack("! 6s 6s H", frame[:14]) 229 | return dest_mac, src_mac, socket.ntohs(eth_type), frame[14:] 230 | 231 | def _parse_ipv4_packet(self, frame_data): 232 | ip_header = struct.unpack("!BBHHHBBH4s4s", frame_data[:20]) 233 | version_and_length = ip_header[0] 234 | version = version_and_length >> 4 235 | header_length = (version_and_length & 0xF) * 4 236 | ttl = ip_header[5] 237 | protocol = ip_header[6] 238 | src_ip = socket.inet_ntoa(ip_header[8]) 239 | dest_ip = socket.inet_ntoa(ip_header[9]) 240 | data = frame_data[header_length:] 241 | return version, header_length, ttl, protocol, src_ip, dest_ip, data 242 | 243 | def _parse_tcp_packet(self, data): 244 | tcp_header = struct.unpack("!HHLLBBHHH", data[:20]) 245 | src_port = tcp_header[0] 246 | dest_port = tcp_header[1] 247 | return src_port, dest_port, data[20:] 248 | 249 | def _parse_udp_packet(self, data): 250 | udp_header = struct.unpack("!HHHH", data[:8]) 251 | src_port = udp_header[0] 252 | dest_port = udp_header[1] 253 | length = udp_header[2] # not in use 254 | checksum = udp_header[3] # not in use 255 | return src_port, dest_port, data[8:] 256 | 257 | def parse_ntlm(self): 258 | ntlmssp1 = re.findall(b"NTLMSSP\x00\x01\x00\x00\x00.*[^EOF]*", self._data) 259 | ntlmssp2 = re.findall(b"NTLMSSP\x00\x02\x00\x00\x00.*[^EOF]*", self._data,re.DOTALL) 260 | ntlmssp3 = re.findall(b"NTLMSSP\x00\x03\x00\x00\x00.*[^EOF]*", self._data,re.DOTALL) 261 | 262 | if ntlmssp2: 263 | global chall 264 | chall = ntlmssp2[0][24:32] 265 | 266 | if ntlmssp3: 267 | data = ntlmssp3[0] 268 | packet_len = len(data) 269 | if packet_len > 0: 270 | sspi_start = data[:] 271 | lm_hash_len = struct.unpack(" 60: 289 | ntlm_hash = "%s::%s:%s:%s:%s" % (user.decode(), domain.decode(), chall.hex(), nt_hash[:16].hex(), nt_hash[16:].hex()) 290 | storage.save("NTLMv2 hash captured", self._traffic, ntlm_hash) 291 | 292 | def parse_ldap(self): 293 | # Parses LDAP cleartext queries, not NTLM. There is parse_ntlm() for that 294 | ldap_bind = re.search(b"\x30....\x60.\x02\x01\x03.*", self._data, re.DOTALL) 295 | 296 | if ldap_bind: 297 | ldap_message = ldap_bind.group(0) 298 | message_len = ldap_message[1] 299 | message_id = ldap_message[2:5] 300 | bind_len = ldap_message[6] 301 | ldap_version = ldap_message[7:10] 302 | dn_len = ldap_message[11] 303 | dn_string = ldap_message[12:12+dn_len].decode() 304 | auth_len = ldap_message[12+dn_len+1] 305 | auth_data = ldap_message[12+dn_len+2:12+dn_len+2+auth_len].decode() 306 | 307 | if dn_string and auth_data: 308 | ldap_auth_data = "DN: " + dn_string + "\nPassword: " + auth_data 309 | storage.save("LDAP bind string captured", self._traffic, ldap_auth_data) 310 | 311 | pass 312 | 313 | def parse_http(self): 314 | # Parse request verb (method) and Host header 315 | http_request = {"method":"", "host":"", "header":""} 316 | 317 | try: 318 | methods = ["GET", "POST", "PUT", "DELETE", "PATCH"] 319 | pattern = (r"(" + "|".join(f"{method} [^\n]+" for method in methods) + r")").encode("utf-8") 320 | method = re.findall(pattern, self._data)[0] 321 | host = re.findall(b"(Host: [^\n]+)", self._data)[0] 322 | http_request["method"] = method.decode().strip() 323 | http_request["host"] = host.decode().strip() 324 | except IndexError: 325 | # IndexError means no data was found matching the criteria in this case, so we ignore it 326 | pass 327 | 328 | # Search common auth strings 329 | common_username_forms = ["log","login","wpname","ahd_username","unickname","nickname","user","user_name","alias","pseudo","email","username","_username","userid","form_loginname","loginname","login_id","loginid","session_key","sessionkey","pop_login","uid","id","user_id","screename","uname","ulogin","acctname","account","member","mailaddress","membername","login_username","login_email","loginusername","loginemail","uin","sign-in","j_username"] 330 | common_password_forms = ["ahd_password","pass","password","_password","passwd","session_password","sessionpassword","login_password","loginpassword","form_pw","pw","userpassword","pwd","upassword","login_passwordpasswort","passwrd","wppassword","upasswd","j_password"] 331 | http_username = re.search("|".join(common_username_forms).encode(), self._data) 332 | http_password = re.search("|".join(common_password_forms).encode(), self._data) 333 | http_negotiate_authz = re.findall(b'(?<=Authorization: Negotiate )[^\\r]*', self._data) 334 | http_negotiate_www = re.findall(b'(?<=WWW-Authenticate: Negotiate )[^\\r]*', self._data) 335 | basic64 = re.findall(b'(?<=Authorization: Basic )[^\n]*', self._data) 336 | http_ntlm2 = re.findall(b'(?<=WWW-Authenticate: NTLM )[^\\r]*', self._data) 337 | http_ntlm3 = re.findall(b'(?<=Authorization: NTLM )[^\\r]*', self._data) 338 | ctx1_usr = re.findall(b'(.*?)', self._data) 339 | ctx1_pwd = re.findall(b'(.*?)', self._data) 340 | 341 | # Parse common form auth 342 | http_user = [] 343 | http_pass = [] 344 | if http_username: 345 | pattern = (r"\b(?:" + "|".join(map(re.escape, common_username_forms)) + r")\b").encode("utf-8") 346 | form_fields = re.findall(pattern, self._data, re.IGNORECASE) 347 | for field in form_fields: 348 | username = re.findall(b"(%s=[^&]+)" % field, self._data) 349 | if username: 350 | http_user.append(username[0].decode()) 351 | 352 | if http_password: 353 | pattern = (r"\b(?:" + "|".join(map(re.escape, common_password_forms)) + r")\b").encode("utf-8") 354 | form_fields = re.findall(pattern, self._data, re.IGNORECASE) 355 | form_fields = re.findall(pattern, self._data, re.IGNORECASE) 356 | for field in form_fields: 357 | password = re.findall(b"(%s=[^&]+)" % field, self._data) 358 | if password: 359 | http_pass.append(password[0].decode()) 360 | 361 | if http_user or http_pass: 362 | request = f'{http_request["method"]}\n{http_request["host"]}\nPossible username(s): {"&".join(http_user)}\nPossible password(s): {"&".join(http_pass)}' 363 | storage.save("Potential HTTP authentication captured", self._traffic, request) 364 | 365 | # Parse common auth headers 366 | if http_negotiate_authz: 367 | http_request["header"] = http_negotiate_authz[0].decode() 368 | request = f'{http_request["method"]}\n{http_request["host"]}\nAuthorization: Negotiate {http_request["header"]}' 369 | storage.save("HTTP authentication header captured", self._traffic, request) 370 | 371 | if http_negotiate_www: 372 | http_request["header"] = http_negotiate_www[0].decode() 373 | request = f'{http_request["method"]}\n{http_request["host"]}\nWWW-Authenticate: Negotiate {http_request["header"]}' 374 | storage.save("HTTP authentication header captured", self._traffic, request) 375 | 376 | if basic64: 377 | http_request["header"] = basic64[0].decode() 378 | request = f'{http_request["method"]}\n{http_request["host"]}\nAuthorization: Basic {http_request["header"]}' 379 | storage.save("HTTP authentication header captured", self._traffic, request) 380 | 381 | if http_ntlm2: 382 | http_request["header"] = http_ntlm2[0].decode() 383 | request = f'{http_request["method"]}\n{http_request["host"]}\nWWW-Authenticate: NTLM {http_request["header"]}' 384 | storage.save("HTTP authentication header captured", self._traffic, request) 385 | 386 | if http_ntlm3: 387 | http_request["header"] = http_ntlm3[0].decode() 388 | request = f'{http_request["method"]}\n{http_request["host"]}\nAuthorization: NTLM {http_request["header"]}' 389 | storage.save("HTTP authentication header captured", self._traffic, request) 390 | 391 | # Parse ctx auth 392 | if ctx1_usr and ctx1_pwd: 393 | try: 394 | request = f'{http_request["method"]}\n{http_request["host"]}\nUsername: {ctx1_usr[0]}\nPassword: {ctx1_pwd[0]}' 395 | storage.save("CTX authentication captured", self._traffic, request) 396 | except IndexError: 397 | pass 398 | 399 | def parse_smtp(self): 400 | # Gotta handle package duplication and ntlm auth 401 | global smtp_auth 402 | try: 403 | smtp_auth 404 | except: 405 | smtp_auth = False 406 | 407 | smtp_auth_header = re.search(b'AUTH LOGIN|AUTH PLAIN|AUTH NTLM', self._data) 408 | if smtp_auth_header: 409 | smtp_auth = True 410 | 411 | if smtp_auth: 412 | try: 413 | auth_data = b64decode(self._data[12:].split(b"\n")[0]).decode() 414 | if auth_data: 415 | storage.save("SMTP authentication data captured", self._traffic, auth_data) 416 | except: 417 | pass 418 | 419 | 420 | def parse_snmp(self): 421 | snmp_version = self._data[4:5] 422 | if snmp_version == b"\x00": 423 | str_len = struct.unpack('