599 lines
16 KiB
TypeScript
599 lines
16 KiB
TypeScript
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import * as plugins from '../plugins.js';
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import { logger } from '../logger.js';
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import { SecurityLogger, SecurityLogLevel, SecurityEventType } from '../security/index.js';
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import type { MtaService } from './classes.mta.js';
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import type { Email } from './classes.email.js';
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import type { IDnsVerificationResult } from './classes.dnsmanager.js';
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/**
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* SPF result qualifiers
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*/
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export enum SpfQualifier {
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PASS = '+',
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NEUTRAL = '?',
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SOFTFAIL = '~',
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FAIL = '-'
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}
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/**
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* SPF mechanism types
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*/
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export enum SpfMechanismType {
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ALL = 'all',
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INCLUDE = 'include',
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A = 'a',
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MX = 'mx',
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IP4 = 'ip4',
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IP6 = 'ip6',
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EXISTS = 'exists',
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REDIRECT = 'redirect',
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EXP = 'exp'
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}
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/**
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* SPF mechanism definition
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*/
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export interface SpfMechanism {
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qualifier: SpfQualifier;
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type: SpfMechanismType;
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value?: string;
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}
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/**
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* SPF record parsed data
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*/
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export interface SpfRecord {
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version: string;
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mechanisms: SpfMechanism[];
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modifiers: Record<string, string>;
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}
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/**
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* SPF verification result
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*/
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export interface SpfResult {
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result: 'pass' | 'neutral' | 'softfail' | 'fail' | 'temperror' | 'permerror' | 'none';
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explanation?: string;
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domain: string;
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ip: string;
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record?: string;
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error?: string;
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}
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/**
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* Maximum lookup limit for SPF records (prevent infinite loops)
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*/
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const MAX_SPF_LOOKUPS = 10;
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/**
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* Class for verifying SPF records
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*/
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export class SpfVerifier {
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private mtaRef: MtaService;
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private lookupCount: number = 0;
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constructor(mtaRefArg: MtaService) {
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this.mtaRef = mtaRefArg;
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}
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/**
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* Parse SPF record from TXT record
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* @param record SPF TXT record
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* @returns Parsed SPF record or null if invalid
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*/
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public parseSpfRecord(record: string): SpfRecord | null {
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if (!record.startsWith('v=spf1')) {
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return null;
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}
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try {
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const spfRecord: SpfRecord = {
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version: 'spf1',
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mechanisms: [],
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modifiers: {}
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};
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// Split into terms
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const terms = record.split(' ').filter(term => term.length > 0);
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// Skip version term
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for (let i = 1; i < terms.length; i++) {
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const term = terms[i];
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// Check if it's a modifier (name=value)
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if (term.includes('=')) {
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const [name, value] = term.split('=');
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spfRecord.modifiers[name] = value;
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continue;
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}
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// Parse as mechanism
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let qualifier = SpfQualifier.PASS; // Default is +
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let mechanismText = term;
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// Check for qualifier
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if (term.startsWith('+') || term.startsWith('-') ||
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term.startsWith('~') || term.startsWith('?')) {
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qualifier = term[0] as SpfQualifier;
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mechanismText = term.substring(1);
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}
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// Parse mechanism type and value
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const colonIndex = mechanismText.indexOf(':');
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let type: SpfMechanismType;
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let value: string | undefined;
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if (colonIndex !== -1) {
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type = mechanismText.substring(0, colonIndex) as SpfMechanismType;
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value = mechanismText.substring(colonIndex + 1);
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} else {
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type = mechanismText as SpfMechanismType;
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}
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spfRecord.mechanisms.push({ qualifier, type, value });
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}
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return spfRecord;
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} catch (error) {
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logger.log('error', `Error parsing SPF record: ${error.message}`, {
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record,
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error: error.message
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});
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return null;
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}
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}
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/**
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* Check if IP is in CIDR range
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* @param ip IP address to check
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* @param cidr CIDR range
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* @returns Whether the IP is in the CIDR range
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*/
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private isIpInCidr(ip: string, cidr: string): boolean {
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try {
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const ipAddress = plugins.ip.Address4.parse(ip);
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return ipAddress.isInSubnet(new plugins.ip.Address4(cidr));
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} catch (error) {
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// Try IPv6
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try {
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const ipAddress = plugins.ip.Address6.parse(ip);
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return ipAddress.isInSubnet(new plugins.ip.Address6(cidr));
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} catch (e) {
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return false;
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}
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}
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}
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/**
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* Check if a domain has the specified IP in its A or AAAA records
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* @param domain Domain to check
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* @param ip IP address to check
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* @returns Whether the domain resolves to the IP
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*/
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private async isDomainResolvingToIp(domain: string, ip: string): Promise<boolean> {
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try {
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// First try IPv4
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const ipv4Addresses = await plugins.dns.promises.resolve4(domain);
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if (ipv4Addresses.includes(ip)) {
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return true;
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}
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// Then try IPv6
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const ipv6Addresses = await plugins.dns.promises.resolve6(domain);
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if (ipv6Addresses.includes(ip)) {
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return true;
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}
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return false;
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} catch (error) {
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return false;
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}
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}
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/**
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* Verify SPF for a given email with IP and helo domain
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* @param email Email to verify
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* @param ip Sender IP address
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* @param heloDomain HELO/EHLO domain used by sender
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* @returns SPF verification result
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*/
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public async verify(
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email: Email,
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ip: string,
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heloDomain: string
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): Promise<SpfResult> {
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const securityLogger = SecurityLogger.getInstance();
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// Reset lookup count
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this.lookupCount = 0;
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// Get domain from envelope from (return-path)
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const domain = email.getEnvelopeFrom().split('@')[1] || '';
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if (!domain) {
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return {
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result: 'permerror',
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explanation: 'No envelope from domain',
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domain: '',
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ip
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};
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}
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try {
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// Look up SPF record
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const spfVerificationResult = await this.mtaRef.dnsManager.verifySpfRecord(domain);
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if (!spfVerificationResult.found) {
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return {
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result: 'none',
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explanation: 'No SPF record found',
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domain,
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ip
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};
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}
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if (!spfVerificationResult.valid) {
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return {
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result: 'permerror',
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explanation: 'Invalid SPF record',
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domain,
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ip,
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record: spfVerificationResult.value
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};
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}
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// Parse SPF record
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const spfRecord = this.parseSpfRecord(spfVerificationResult.value);
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if (!spfRecord) {
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return {
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result: 'permerror',
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explanation: 'Failed to parse SPF record',
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domain,
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ip,
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record: spfVerificationResult.value
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};
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}
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// Check SPF record
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const result = await this.checkSpfRecord(spfRecord, domain, ip);
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// Log the result
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const spfLogLevel = result.result === 'pass' ?
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SecurityLogLevel.INFO :
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(result.result === 'fail' ? SecurityLogLevel.WARN : SecurityLogLevel.INFO);
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securityLogger.logEvent({
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level: spfLogLevel,
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type: SecurityEventType.SPF,
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message: `SPF ${result.result} for ${domain} from IP ${ip}`,
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domain,
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details: {
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ip,
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heloDomain,
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result: result.result,
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explanation: result.explanation,
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record: spfVerificationResult.value
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},
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success: result.result === 'pass'
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});
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return {
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...result,
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domain,
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ip,
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record: spfVerificationResult.value
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};
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} catch (error) {
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// Log error
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logger.log('error', `SPF verification error: ${error.message}`, {
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domain,
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ip,
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error: error.message
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});
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securityLogger.logEvent({
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level: SecurityLogLevel.ERROR,
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type: SecurityEventType.SPF,
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message: `SPF verification error for ${domain}`,
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domain,
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details: {
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ip,
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error: error.message
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},
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success: false
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});
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return {
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result: 'temperror',
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explanation: `Error verifying SPF: ${error.message}`,
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domain,
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ip,
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error: error.message
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};
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}
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}
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/**
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* Check SPF record against IP address
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* @param spfRecord Parsed SPF record
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* @param domain Domain being checked
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* @param ip IP address to check
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* @returns SPF result
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*/
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private async checkSpfRecord(
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spfRecord: SpfRecord,
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domain: string,
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ip: string
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): Promise<SpfResult> {
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// Check for 'redirect' modifier
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if (spfRecord.modifiers.redirect) {
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this.lookupCount++;
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if (this.lookupCount > MAX_SPF_LOOKUPS) {
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return {
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result: 'permerror',
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explanation: 'Too many DNS lookups',
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domain,
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ip
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};
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}
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// Handle redirect
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const redirectDomain = spfRecord.modifiers.redirect;
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const redirectResult = await this.mtaRef.dnsManager.verifySpfRecord(redirectDomain);
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if (!redirectResult.found || !redirectResult.valid) {
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return {
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result: 'permerror',
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explanation: `Invalid redirect to ${redirectDomain}`,
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domain,
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ip
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};
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}
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const redirectRecord = this.parseSpfRecord(redirectResult.value);
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if (!redirectRecord) {
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return {
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result: 'permerror',
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explanation: `Failed to parse redirect record from ${redirectDomain}`,
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domain,
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ip
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};
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}
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return this.checkSpfRecord(redirectRecord, redirectDomain, ip);
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}
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// Check each mechanism in order
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for (const mechanism of spfRecord.mechanisms) {
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let matched = false;
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switch (mechanism.type) {
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case SpfMechanismType.ALL:
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matched = true;
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break;
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case SpfMechanismType.IP4:
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if (mechanism.value) {
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matched = this.isIpInCidr(ip, mechanism.value);
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}
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break;
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case SpfMechanismType.IP6:
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if (mechanism.value) {
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matched = this.isIpInCidr(ip, mechanism.value);
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}
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break;
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case SpfMechanismType.A:
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this.lookupCount++;
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if (this.lookupCount > MAX_SPF_LOOKUPS) {
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return {
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result: 'permerror',
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explanation: 'Too many DNS lookups',
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domain,
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ip
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};
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}
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// Check if domain has A/AAAA record matching IP
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const checkDomain = mechanism.value || domain;
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matched = await this.isDomainResolvingToIp(checkDomain, ip);
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break;
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case SpfMechanismType.MX:
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this.lookupCount++;
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if (this.lookupCount > MAX_SPF_LOOKUPS) {
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return {
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result: 'permerror',
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explanation: 'Too many DNS lookups',
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domain,
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ip
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};
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}
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// Check MX records
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const mxDomain = mechanism.value || domain;
|
||
|
|
|
||
|
|
try {
|
||
|
|
const mxRecords = await plugins.dns.promises.resolveMx(mxDomain);
|
||
|
|
|
||
|
|
for (const mx of mxRecords) {
|
||
|
|
// Check if this MX record's IP matches
|
||
|
|
const mxMatches = await this.isDomainResolvingToIp(mx.exchange, ip);
|
||
|
|
|
||
|
|
if (mxMatches) {
|
||
|
|
matched = true;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} catch (error) {
|
||
|
|
// No MX records or error
|
||
|
|
matched = false;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case SpfMechanismType.INCLUDE:
|
||
|
|
if (!mechanism.value) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
this.lookupCount++;
|
||
|
|
|
||
|
|
if (this.lookupCount > MAX_SPF_LOOKUPS) {
|
||
|
|
return {
|
||
|
|
result: 'permerror',
|
||
|
|
explanation: 'Too many DNS lookups',
|
||
|
|
domain,
|
||
|
|
ip
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check included domain's SPF record
|
||
|
|
const includeDomain = mechanism.value;
|
||
|
|
const includeResult = await this.mtaRef.dnsManager.verifySpfRecord(includeDomain);
|
||
|
|
|
||
|
|
if (!includeResult.found || !includeResult.valid) {
|
||
|
|
continue; // Skip this mechanism
|
||
|
|
}
|
||
|
|
|
||
|
|
const includeRecord = this.parseSpfRecord(includeResult.value);
|
||
|
|
|
||
|
|
if (!includeRecord) {
|
||
|
|
continue; // Skip this mechanism
|
||
|
|
}
|
||
|
|
|
||
|
|
// Recursively check the included SPF record
|
||
|
|
const includeCheck = await this.checkSpfRecord(includeRecord, includeDomain, ip);
|
||
|
|
|
||
|
|
// Include mechanism matches if the result is "pass"
|
||
|
|
matched = includeCheck.result === 'pass';
|
||
|
|
break;
|
||
|
|
|
||
|
|
case SpfMechanismType.EXISTS:
|
||
|
|
if (!mechanism.value) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
this.lookupCount++;
|
||
|
|
|
||
|
|
if (this.lookupCount > MAX_SPF_LOOKUPS) {
|
||
|
|
return {
|
||
|
|
result: 'permerror',
|
||
|
|
explanation: 'Too many DNS lookups',
|
||
|
|
domain,
|
||
|
|
ip
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check if domain exists (has any A record)
|
||
|
|
try {
|
||
|
|
await plugins.dns.promises.resolve(mechanism.value, 'A');
|
||
|
|
matched = true;
|
||
|
|
} catch (error) {
|
||
|
|
matched = false;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
// If this mechanism matched, return its result
|
||
|
|
if (matched) {
|
||
|
|
switch (mechanism.qualifier) {
|
||
|
|
case SpfQualifier.PASS:
|
||
|
|
return {
|
||
|
|
result: 'pass',
|
||
|
|
explanation: `Matched ${mechanism.type}${mechanism.value ? ':' + mechanism.value : ''}`,
|
||
|
|
domain,
|
||
|
|
ip
|
||
|
|
};
|
||
|
|
case SpfQualifier.FAIL:
|
||
|
|
return {
|
||
|
|
result: 'fail',
|
||
|
|
explanation: `Matched ${mechanism.type}${mechanism.value ? ':' + mechanism.value : ''}`,
|
||
|
|
domain,
|
||
|
|
ip
|
||
|
|
};
|
||
|
|
case SpfQualifier.SOFTFAIL:
|
||
|
|
return {
|
||
|
|
result: 'softfail',
|
||
|
|
explanation: `Matched ${mechanism.type}${mechanism.value ? ':' + mechanism.value : ''}`,
|
||
|
|
domain,
|
||
|
|
ip
|
||
|
|
};
|
||
|
|
case SpfQualifier.NEUTRAL:
|
||
|
|
return {
|
||
|
|
result: 'neutral',
|
||
|
|
explanation: `Matched ${mechanism.type}${mechanism.value ? ':' + mechanism.value : ''}`,
|
||
|
|
domain,
|
||
|
|
ip
|
||
|
|
};
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// If no mechanism matched, default to neutral
|
||
|
|
return {
|
||
|
|
result: 'neutral',
|
||
|
|
explanation: 'No matching mechanism found',
|
||
|
|
domain,
|
||
|
|
ip
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Check if email passes SPF verification
|
||
|
|
* @param email Email to verify
|
||
|
|
* @param ip Sender IP address
|
||
|
|
* @param heloDomain HELO/EHLO domain used by sender
|
||
|
|
* @returns Whether email passes SPF
|
||
|
|
*/
|
||
|
|
public async verifyAndApply(
|
||
|
|
email: Email,
|
||
|
|
ip: string,
|
||
|
|
heloDomain: string
|
||
|
|
): Promise<boolean> {
|
||
|
|
const result = await this.verify(email, ip, heloDomain);
|
||
|
|
|
||
|
|
// Add headers
|
||
|
|
email.headers['Received-SPF'] = `${result.result} (${result.domain}: ${result.explanation}) client-ip=${ip}; envelope-from=${email.getEnvelopeFrom()}; helo=${heloDomain};`;
|
||
|
|
|
||
|
|
// Apply policy based on result
|
||
|
|
switch (result.result) {
|
||
|
|
case 'fail':
|
||
|
|
// Fail - mark as spam
|
||
|
|
email.mightBeSpam = true;
|
||
|
|
logger.log('warn', `SPF failed for ${result.domain} from ${ip}: ${result.explanation}`);
|
||
|
|
return false;
|
||
|
|
|
||
|
|
case 'softfail':
|
||
|
|
// Soft fail - accept but mark as suspicious
|
||
|
|
email.mightBeSpam = true;
|
||
|
|
logger.log('info', `SPF softfailed for ${result.domain} from ${ip}: ${result.explanation}`);
|
||
|
|
return true;
|
||
|
|
|
||
|
|
case 'neutral':
|
||
|
|
case 'none':
|
||
|
|
// Neutral or none - accept but note in headers
|
||
|
|
logger.log('info', `SPF ${result.result} for ${result.domain} from ${ip}: ${result.explanation}`);
|
||
|
|
return true;
|
||
|
|
|
||
|
|
case 'pass':
|
||
|
|
// Pass - accept
|
||
|
|
logger.log('info', `SPF passed for ${result.domain} from ${ip}: ${result.explanation}`);
|
||
|
|
return true;
|
||
|
|
|
||
|
|
case 'temperror':
|
||
|
|
case 'permerror':
|
||
|
|
// Temporary or permanent error - log but accept
|
||
|
|
logger.log('error', `SPF error for ${result.domain} from ${ip}: ${result.explanation}`);
|
||
|
|
return true;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|