├── .gitignore ├── LICENSE ├── README.md ├── dns_dump.py ├── requirements.txt └── spoofcheck.py /.gitignore: -------------------------------------------------------------------------------- 1 | .vscode 2 | .idea 3 | venv 4 | pyvenv.cfg 5 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # SpoofCheck 2 | 3 | A Python tool to check if a domain can be spoofed by analyzing its SPF and DMARC records. This Project is a shameless rip off [spoofcheck](https://github.com/BishopFox/spoofcheck) which was written in python2. 4 | 5 | This is my effort to make it compatible with python3. 6 | 7 | - Analyzes SPF (Sender Policy Framework) records 8 | - Checks DMARC (Domain-based Message Authentication, Reporting, and Conformance) policies 9 | - Identifies weak configurations that could allow email spoofing 10 | - Examines organizational DMARC records 11 | 12 | 13 | 14 | ## Usage 15 | 16 | ```bash 17 | python3 spoofcheck.py example.com 18 | ``` 19 | 20 | ## What Makes a Domain Spoofable? 21 | 22 | A domain is considered spoofable if any of these conditions are met: 23 | 24 | 1. No SPF record exists 25 | 2. SPF record exists but never specifies `~all` or `-all` 26 | 3. No DMARC record exists 27 | 4. DMARC policy is set to `p=none` 28 | 5. Organizational DMARC record is weak or nonexistent 29 | 30 | ## Setup 31 | 32 | Run `pip3 install -r requirements.txt` from the command line to install the required dependencies. 33 | -------------------------------------------------------------------------------- /dns_dump.py: -------------------------------------------------------------------------------- 1 | import sys 2 | 3 | import dns.resolver 4 | from colorama import Fore, Style 5 | 6 | if len(sys.argv) != 2: 7 | domain = input("Enter domain name: ") 8 | else: 9 | domain = sys.argv[1] 10 | 11 | for record_type in ["A", "AAAA", "MX", "NS", "CNAME", "SOA", "TXT", "PTR"]: 12 | try: 13 | answer = dns.resolver.resolve(domain, record_type, raise_on_no_answer=False) 14 | if answer: 15 | print( 16 | Fore.GREEN + Style.BRIGHT + "[*]" + Style.RESET_ALL, 17 | f"{record_type} records\n", 18 | ) 19 | for rdata in answer: 20 | print(rdata, end="\n\n") 21 | except Exception as e: 22 | print(Fore.RED + Style.BRIGHT + f"[*] {e}") 23 | break 24 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | colorama 2 | dnslib 3 | py-emailprotections 4 | tldextract 5 | dnspython -------------------------------------------------------------------------------- /spoofcheck.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python3 2 | 3 | import logging 4 | import sys 5 | from typing import List, Tuple 6 | 7 | import emailprotectionslib.dmarc as dmarc_lib 8 | import emailprotectionslib.spf as spf_lib 9 | from colorama import Fore, Style 10 | from colorama import init as color_init 11 | from dns.exception import DNSException 12 | 13 | logging.basicConfig(level=logging.INFO) 14 | 15 | 16 | def output(message, level="info"): 17 | colors = { 18 | "good": Fore.GREEN + Style.BRIGHT + "[+]" + Style.RESET_ALL, 19 | "indifferent": Fore.BLUE + Style.BRIGHT + "[*]" + Style.RESET_ALL, 20 | "error": Fore.RED + Style.BRIGHT + "[-] !!! " + Style.NORMAL, 21 | "bad": Fore.RED + Style.BRIGHT + "[-]" + Style.RESET_ALL, 22 | "info": Fore.WHITE + Style.BRIGHT + "[*]" + Style.RESET_ALL, 23 | } 24 | print(colors[level], message) 25 | 26 | 27 | def check_spf_redirect_mechanisms(spf_record: spf_lib.SpfRecord) -> bool: 28 | redirect_domain = spf_record.get_redirect_domain() 29 | if redirect_domain: 30 | output(f"Processing an SPF redirect domain: {redirect_domain}", "info") 31 | return is_spf_record_strong(redirect_domain) 32 | return False 33 | 34 | 35 | def check_spf_include_mechanisms(spf_record: spf_lib.SpfRecord) -> bool: 36 | include_domain_list = spf_record.get_include_domains() 37 | for include_domain in include_domain_list: 38 | output(f"Processing an SPF include domain: {include_domain}", "info") 39 | if is_spf_record_strong(include_domain): 40 | return True 41 | return False 42 | 43 | 44 | def is_spf_redirect_record_strong(spf_record: spf_lib.SpfRecord) -> bool: 45 | output(f"Checking SPF redirect domain: {spf_record.get_redirect_domain()}", "info") 46 | redirect_strong = spf_record._is_redirect_mechanism_strong() 47 | level = "bad" if redirect_strong else "indifferent" 48 | output( 49 | ( 50 | "Redirect mechanism is strong" 51 | if redirect_strong 52 | else "Redirect mechanism is not strong" 53 | ), 54 | level, 55 | ) 56 | return redirect_strong 57 | 58 | 59 | def check_spf_include_redirect(spf_record: spf_lib.SpfRecord) -> bool: 60 | if spf_record.get_redirect_domain(): 61 | if is_spf_redirect_record_strong(spf_record): 62 | return True 63 | return spf_record._are_include_mechanisms_strong() 64 | 65 | 66 | def check_spf_all_string(spf_record: spf_lib.SpfRecord) -> bool: 67 | """Check if SPF all string is strong""" 68 | if spf_record.all_string: 69 | if spf_record.all_string in ["~all", "-all"]: 70 | output( 71 | f"SPF record contains an All item: {spf_record.all_string}", 72 | "indifferent", 73 | ) 74 | return True 75 | else: 76 | output(f"SPF record All item is too weak: {spf_record.all_string}", "good") 77 | else: 78 | output("SPF record has no All string", "good") 79 | 80 | return check_spf_include_redirect(spf_record) 81 | 82 | 83 | def is_spf_record_strong(domain: str) -> bool: 84 | try: 85 | spf_record = spf_lib.SpfRecord.from_domain(domain) 86 | if spf_record and spf_record.record: 87 | output("Found SPF record:", "info") 88 | output(str(spf_record.record), "info") 89 | if not check_spf_all_string(spf_record): 90 | if not check_spf_redirect_mechanisms( 91 | spf_record 92 | ) and not check_spf_include_mechanisms(spf_record): 93 | return False 94 | else: 95 | output(f"{domain} has no SPF record!", "good") 96 | return False 97 | return True 98 | except DNSException as e: 99 | output(f"DNS error while checking SPF: {str(e)}", "error") 100 | return False 101 | 102 | 103 | def check_dmarc_extras(dmarc_record: dmarc_lib.DmarcRecord) -> None: 104 | if dmarc_record.pct and dmarc_record.pct != "100": 105 | output( 106 | f"DMARC pct is set to {dmarc_record.pct}% - might be possible", 107 | "indifferent", 108 | ) 109 | if dmarc_record.rua: 110 | output(f"Aggregate reports will be sent: {dmarc_record.rua}", "indifferent") 111 | if dmarc_record.ruf: 112 | output(f"Forensics reports will be sent: {dmarc_record.ruf}", "indifferent") 113 | 114 | 115 | def check_dmarc_policy(dmarc_record: dmarc_lib.DmarcRecord) -> bool: 116 | if dmarc_record.policy: 117 | if dmarc_record.policy in ["reject", "quarantine"]: 118 | output(f"DMARC policy set to {dmarc_record.policy}", "bad") 119 | return True 120 | else: 121 | output(f"DMARC policy set to {dmarc_record.policy}", "good") 122 | else: 123 | output("DMARC record has no Policy", "good") 124 | return False 125 | 126 | 127 | def check_dmarc_org_policy(base_record: dmarc_lib.DmarcRecord) -> bool: 128 | try: 129 | org_record = base_record.get_org_record() 130 | if org_record and org_record.record: 131 | output("Found organizational DMARC record:", "info") 132 | output(str(org_record.record), "info") 133 | if org_record.subdomain_policy: 134 | if org_record.subdomain_policy == "none": 135 | output( 136 | f"Organizational subdomain policy set to {org_record.subdomain_policy}", 137 | "good", 138 | ) 139 | elif org_record.subdomain_policy in ["quarantine", "reject"]: 140 | output( 141 | f"Organizational subdomain policy explicitly set to {org_record.subdomain_policy}", 142 | "bad", 143 | ) 144 | return True 145 | else: 146 | output( 147 | "No explicit organizational subdomain policy. Defaulting to organizational policy", 148 | "info", 149 | ) 150 | return check_dmarc_policy(org_record) 151 | else: 152 | output("No organizational DMARC record", "good") 153 | except dmarc_lib.OrgDomainException: 154 | output("No organizational DMARC record", "good") 155 | except Exception as e: 156 | logging.exception(e) 157 | return False 158 | 159 | 160 | def is_dmarc_record_strong(domain: str) -> bool: 161 | try: 162 | dmarc = dmarc_lib.DmarcRecord.from_domain(domain) 163 | if dmarc and dmarc.record: 164 | output("Found DMARC record:", "info") 165 | output(str(dmarc.record), "info") 166 | if check_dmarc_policy(dmarc): 167 | check_dmarc_extras(dmarc) 168 | return True 169 | elif dmarc.get_org_domain(): 170 | output("No DMARC record found. Looking for organizational record", "info") 171 | return check_dmarc_org_policy(dmarc) 172 | else: 173 | output(f"{domain} has no DMARC record!", "good") 174 | return False 175 | except DNSException as e: 176 | output(f"DNS error while checking DMARC: {str(e)}", "error") 177 | return False 178 | 179 | 180 | def check_domain(domain: str) -> Tuple[bool, bool, bool]: 181 | spf_strong = is_spf_record_strong(domain) 182 | dmarc_strong = is_dmarc_record_strong(domain) 183 | is_spoofable = not dmarc_strong 184 | return is_spoofable, spf_strong, dmarc_strong 185 | 186 | 187 | if __name__ == "__main__": 188 | try: 189 | color_init() 190 | domain = sys.argv[1] 191 | is_spoofable, spf_strong, dmarc_strong = check_domain(domain) 192 | 193 | if is_spoofable: 194 | output(f"Spoofing possible for {domain}!", "good") 195 | else: 196 | output(f"Spoofing not possible for {domain}", "bad") 197 | 198 | except Exception as e: 199 | logger.exception("An unexpected error occurred") 200 | output(f"Error: {str(e)}", "error") 201 | sys.exit(1) 202 | except IndexError: 203 | output(f"Usage: {sys.argv[0]} [DOMAIN]", "error") 204 | --------------------------------------------------------------------------------