Pierre-Olivier Mercier
e168446b44
Compare the HELO/EHLO hostname announced by the sending server (first Received hop) against the sender IP's PTR records, surfacing the same signal as x-ptr/policy.ptr in Authentication-Results. Adds helo_hostname and helo_ptr_match to DNSResults, applies a 15-point PTR sub-score penalty on mismatch, and displays the result in a new HELO/PTR Consistency card.
61 lines
2.1 KiB
Go
61 lines
2.1 KiB
Go
// This file is part of the happyDeliver (R) project.
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// Copyright (c) 2025-2026 happyDomain
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// Authors: Pierre-Olivier Mercier, et al.
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//
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// This program is offered under a commercial and under the AGPL license.
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// For commercial licensing, contact us at <contact@happydomain.org>.
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//
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// For AGPL licensing:
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package analyzer
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import (
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"regexp"
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"strings"
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"git.happydns.org/happyDeliver/internal/model"
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"git.happydns.org/happyDeliver/internal/utils"
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)
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// parseXPtrResult parses the x-ptr result from Authentication-Results.
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// Example: x-ptr=fail smtp.helo=relay.example.org policy.ptr=mail.example.com
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func (a *AuthenticationAnalyzer) parseXPtrResult(part string) *model.XPtrResult {
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result := &model.XPtrResult{}
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// Extract result (pass, fail, none, temperror, permerror)
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re := regexp.MustCompile(`x-ptr=(\w+)`)
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if matches := re.FindStringSubmatch(part); len(matches) > 1 {
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resultStr := strings.ToLower(matches[1])
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result.Result = model.XPtrResultResult(resultStr)
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}
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// Extract announced HELO hostname (smtp.helo)
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heloRe := regexp.MustCompile(`smtp\.helo=([^\s;()]+)`)
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if matches := heloRe.FindStringSubmatch(part); len(matches) > 1 {
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helo := matches[1]
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result.Helo = &helo
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}
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// Extract reverse DNS hostname (policy.ptr)
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ptrRe := regexp.MustCompile(`policy\.ptr=([^\s;()]+)`)
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if matches := ptrRe.FindStringSubmatch(part); len(matches) > 1 {
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ptr := matches[1]
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result.Ptr = &ptr
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}
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result.Details = utils.PtrTo(strings.TrimPrefix(part, "x-ptr="))
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return result
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}
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