diff --git a/api/schemas.yaml b/api/schemas.yaml index df0b416..53aa297 100644 --- a/api/schemas.yaml +++ b/api/schemas.yaml @@ -873,6 +873,24 @@ components: type: string description: DKIM record content example: "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA..." + key_type: + type: string + description: "Key type from k= tag (e.g. rsa, ed25519); defaults to rsa if absent" + example: "rsa" + hash_algorithms: + type: array + items: + type: string + description: "Acceptable hash algorithms from h= tag; empty means all accepted (RFC 6376 default: sha256)" + example: ["sha256"] + signing_algorithm: + type: string + description: "Algorithm used in DKIM-Signature a= tag (e.g. rsa-sha256, ed25519-sha256)" + example: "rsa-sha256" + key_size: + type: integer + description: "Public key size in bits (RSA: 1024/2048/4096; Ed25519: always 256)" + example: 2048 valid: type: boolean description: Whether the DKIM record is valid @@ -891,6 +909,10 @@ components: type: string description: DMARC record content example: "v=DMARC1; p=quarantine; rua=mailto:dmarc@example.com" + domain: + type: string + description: Domain at which the DMARC record was found (may differ from From domain when organizational domain fallback was used) + example: "example.com" policy: type: string enum: [none, quarantine, reject, unknown] @@ -901,12 +923,38 @@ components: enum: [none, quarantine, reject, unknown] description: DMARC subdomain policy (sp tag) - policy for subdomains if different from main policy example: "quarantine" + nonexistent_subdomain_policy: + type: string + enum: [none, quarantine, reject, unknown] + description: DMARC non-existent subdomain policy (np tag) - policy for non-existent subdomains (NXDOMAIN); defaults to sp= or p= if absent (DMARCbis) + example: "reject" percentage: type: integer minimum: 0 maximum: 100 - description: Percentage of messages subjected to filtering (pct tag, default 100) + description: "Percentage of messages subjected to filtering (pct tag, default 100). DEPRECATED in DMARCbis: use test_mode (t=y) instead." example: 100 + test_mode: + type: boolean + description: "DMARCbis t= tag: when true (t=y), receivers downgrade effective policy one level (reject→quarantine, quarantine→none). Replaces the deprecated pct= tag for testing." + example: false + psd: + type: string + enum: [y, n, u] + description: "DMARCbis psd= tag: y=this is a Public Suffix Domain, n=this is an Organizational Domain boundary, u=unknown (default, use DNS Tree Walk to determine)" + example: "u" + deprecated_pct: + type: boolean + description: "Whether the deprecated pct= tag was found in the record (pct is removed in DMARCbis; migrate to t=y for testing mode)" + example: false + deprecated_rf: + type: boolean + description: "Whether the deprecated rf= tag was found in the record (rf is removed in DMARCbis; failure report formats are now defined separately)" + example: false + deprecated_ri: + type: boolean + description: "Whether the deprecated ri= tag was found in the record (ri is removed in DMARCbis; aggregate reporting interval is now fixed at ≥24 hours)" + example: false spf_alignment: type: string enum: [relaxed, strict] diff --git a/internal/app/cli_analyzer.go b/internal/app/cli_analyzer.go index d8336a5..c704c56 100644 --- a/internal/app/cli_analyzer.go +++ b/internal/app/cli_analyzer.go @@ -202,6 +202,9 @@ func outputHumanReadable(result *analyzer.AnalysisResult, emailAnalyzer *analyze if dns.DmarcRecord.SubdomainPolicy != nil { fmt.Fprintf(writer, ", Subdomain Policy: %s", *dns.DmarcRecord.SubdomainPolicy) } + if dns.DmarcRecord.NonexistentSubdomainPolicy != nil { + fmt.Fprintf(writer, ", Non-Existent Subdomain Policy: %s", *dns.DmarcRecord.NonexistentSubdomainPolicy) + } fmt.Fprintln(writer) if dns.DmarcRecord.Record != nil { fmt.Fprintf(writer, " %s\n", *dns.DmarcRecord.Record) diff --git a/pkg/analyzer/authentication.go b/pkg/analyzer/authentication.go index da31b1c..bd8880d 100644 --- a/pkg/analyzer/authentication.go +++ b/pkg/analyzer/authentication.go @@ -174,9 +174,7 @@ func (a *AuthenticationAnalyzer) CalculateAuthenticationScore(results *model.Aut score += 12 * a.calculateXGoogleDKIMScore(results) / 100 // Penalty-only: X-Aligned-From (up to -5 points on failure) - if xAlignedScore := a.calculateXAlignedFromScore(results); xAlignedScore < 100 { - score += 5 * (xAlignedScore - 100) / 100 - } + score += 5 * a.calculateXAlignedFromScore(results) / 100 // Ensure score doesn't exceed 100 if score > 100 { diff --git a/pkg/analyzer/authentication_test.go b/pkg/analyzer/authentication_test.go index 44c1abb..0b17bf0 100644 --- a/pkg/analyzer/authentication_test.go +++ b/pkg/analyzer/authentication_test.go @@ -47,7 +47,7 @@ func TestGetAuthenticationScore(t *testing.T) { Result: model.AuthResultResultPass, }, }, - expectedScore: 73, // SPF=25 + DKIM=23 + DMARC=25 + expectedScore: 90, // SPF=30 + DKIM=30 + DMARC=30 }, { name: "SPF and DKIM only", @@ -59,7 +59,7 @@ func TestGetAuthenticationScore(t *testing.T) { {Result: model.AuthResultResultPass}, }, }, - expectedScore: 48, // SPF=25 + DKIM=23 + expectedScore: 60, // SPF=30 + DKIM=30 }, { name: "SPF fail, DKIM pass", @@ -71,7 +71,7 @@ func TestGetAuthenticationScore(t *testing.T) { {Result: model.AuthResultResultPass}, }, }, - expectedScore: 23, // SPF=0 + DKIM=23 + expectedScore: 30, // SPF=0 + DKIM=30 }, { name: "SPF softfail", @@ -80,7 +80,7 @@ func TestGetAuthenticationScore(t *testing.T) { Result: model.AuthResultResultSoftfail, }, }, - expectedScore: 4, + expectedScore: 5, // 30 * 17 / 100 = 5 }, { name: "No authentication", @@ -97,7 +97,7 @@ func TestGetAuthenticationScore(t *testing.T) { Result: model.AuthResultResultPass, }, }, - expectedScore: 35, // SPF (25) + BIMI (10) + expectedScore: 40, // SPF (30) + BIMI (10) }, } diff --git a/pkg/analyzer/authentication_x_aligned_from.go b/pkg/analyzer/authentication_x_aligned_from.go index ec1571c..45c2e2e 100644 --- a/pkg/analyzer/authentication_x_aligned_from.go +++ b/pkg/analyzer/authentication_x_aligned_from.go @@ -51,16 +51,16 @@ func (a *AuthenticationAnalyzer) calculateXAlignedFromScore(results *model.Authe if results.XAlignedFrom != nil { switch results.XAlignedFrom.Result { case model.AuthResultResultPass: - // pass: positive contribution - return 100 + // pass: no impact + return 0 case model.AuthResultResultFail: // fail: negative contribution - return 0 + return -100 default: // neutral, none, etc.: no impact return 0 } } - return 100 + return 0 } diff --git a/pkg/analyzer/authentication_x_aligned_from_test.go b/pkg/analyzer/authentication_x_aligned_from_test.go index 1ea6d1c..ee90c0d 100644 --- a/pkg/analyzer/authentication_x_aligned_from_test.go +++ b/pkg/analyzer/authentication_x_aligned_from_test.go @@ -92,18 +92,18 @@ func TestCalculateXAlignedFromScore(t *testing.T) { expectedScore int }{ { - name: "pass result gives positive score", + name: "pass result gives no penalty", result: &model.AuthResult{ Result: model.AuthResultResultPass, }, - expectedScore: 100, + expectedScore: 0, }, { - name: "fail result gives zero score", + name: "fail result gives full penalty", result: &model.AuthResult{ Result: model.AuthResultResultFail, }, - expectedScore: 0, + expectedScore: -100, }, { name: "neutral result gives zero score", diff --git a/pkg/analyzer/dns.go b/pkg/analyzer/dns.go index 3210dd1..6bc7c39 100644 --- a/pkg/analyzer/dns.go +++ b/pkg/analyzer/dns.go @@ -106,7 +106,7 @@ func (d *DNSAnalyzer) AnalyzeDNS(email *EmailMessage, headersResults *model.Head // Check DKIM records by parsing DKIM-Signature headers directly for _, sig := range parseDKIMSignatures(email.Header["Dkim-Signature"]) { - dkimRecord := d.checkDKIMRecord(sig.Domain, sig.Selector) + dkimRecord := d.checkDKIMRecord(sig) if dkimRecord != nil { if results.DkimRecords == nil { results.DkimRecords = new([]model.DKIMRecord) diff --git a/pkg/analyzer/dns_dkim.go b/pkg/analyzer/dns_dkim.go index 2ae03cb..115e347 100644 --- a/pkg/analyzer/dns_dkim.go +++ b/pkg/analyzer/dns_dkim.go @@ -23,6 +23,8 @@ package analyzer import ( "context" + "crypto/x509" + "encoding/base64" "fmt" "strings" @@ -30,17 +32,18 @@ import ( "git.happydns.org/happyDeliver/internal/utils" ) -// DKIMHeader holds the domain and selector extracted from a DKIM-Signature header. +// DKIMHeader holds the domain, selector and signing algorithm from a DKIM-Signature header. type DKIMHeader struct { - Domain string - Selector string + Domain string + Selector string + Algorithm string // from a= tag (e.g. rsa-sha256, ed25519-sha256) } -// parseDKIMSignatures extracts domain and selector from DKIM-Signature header values. +// parseDKIMSignatures extracts domain, selector and algorithm from DKIM-Signature header values. func parseDKIMSignatures(signatures []string) []DKIMHeader { var results []DKIMHeader for _, sig := range signatures { - var domain, selector string + var domain, selector, algorithm string for _, part := range strings.Split(sig, ";") { kv := strings.SplitN(strings.TrimSpace(part), "=", 2) if len(kv) != 2 { @@ -53,19 +56,61 @@ func parseDKIMSignatures(signatures []string) []DKIMHeader { domain = val case "s": selector = val + case "a": + algorithm = val } } if domain != "" && selector != "" { - results = append(results, DKIMHeader{Domain: domain, Selector: selector}) + results = append(results, DKIMHeader{Domain: domain, Selector: selector, Algorithm: algorithm}) } } return results } -// checkmodel.DKIMRecord looks up and validates DKIM record for a domain and selector -func (d *DNSAnalyzer) checkDKIMRecord(domain, selector string) *model.DKIMRecord { - // DKIM records are at: selector._domainkey.domain - dkimDomain := fmt.Sprintf("%s._domainkey.%s", selector, domain) +// parseDKIMTags splits a DKIM DNS record into a tag→value map. +func parseDKIMTags(record string) map[string]string { + tags := make(map[string]string) + for _, part := range strings.Split(record, ";") { + kv := strings.SplitN(strings.TrimSpace(part), "=", 2) + if len(kv) != 2 { + continue + } + tags[strings.TrimSpace(kv[0])] = strings.TrimSpace(kv[1]) + } + return tags +} + +// parseKeySize derives the public key bit length from a base64-encoded DER public key. +// For RSA keys it parses the PKIX structure; for Ed25519 it always returns 256. +func parseKeySize(keyType, p string) *int { + switch strings.ToLower(keyType) { + case "ed25519": + return utils.PtrTo(256) + case "rsa", "": + der, err := base64.StdEncoding.DecodeString(p) + if err != nil { + // Try without padding + der, err = base64.RawStdEncoding.DecodeString(p) + if err != nil { + return nil + } + } + pub, err := x509.ParsePKIXPublicKey(der) + if err != nil { + return nil + } + if rsaPub, ok := pub.(interface{ Size() int }); ok { + bits := rsaPub.Size() * 8 + return &bits + } + return nil + } + return nil +} + +// checkDKIMRecord looks up and validates DKIM record for a domain and selector. +func (d *DNSAnalyzer) checkDKIMRecord(h DKIMHeader) *model.DKIMRecord { + dkimDomain := fmt.Sprintf("%s._domainkey.%s", h.Selector, h.Domain) ctx, cancel := context.WithTimeout(context.Background(), d.Timeout) defer cancel() @@ -73,53 +118,83 @@ func (d *DNSAnalyzer) checkDKIMRecord(domain, selector string) *model.DKIMRecord txtRecords, err := d.resolver.LookupTXT(ctx, dkimDomain) if err != nil { return &model.DKIMRecord{ - Selector: selector, - Domain: domain, - Valid: false, - Error: utils.PtrTo(fmt.Sprintf("Failed to lookup DKIM record: %v", err)), + Selector: h.Selector, + Domain: h.Domain, + SigningAlgorithm: signingAlgorithmPtr(h.Algorithm), + Valid: false, + Error: utils.PtrTo(fmt.Sprintf("Failed to lookup DKIM record: %v", err)), } } if len(txtRecords) == 0 { return &model.DKIMRecord{ - Selector: selector, - Domain: domain, - Valid: false, - Error: utils.PtrTo("No DKIM record found"), + Selector: h.Selector, + Domain: h.Domain, + SigningAlgorithm: signingAlgorithmPtr(h.Algorithm), + Valid: false, + Error: utils.PtrTo("No DKIM record found"), } } // Concatenate all TXT record parts (DKIM can be split) dkimRecord := strings.Join(txtRecords, "") - // Basic validation - should contain "v=DKIM1" and "p=" (public key) if !d.validateDKIM(dkimRecord) { return &model.DKIMRecord{ - Selector: selector, - Domain: domain, - Record: utils.PtrTo(dkimRecord), - Valid: false, - Error: utils.PtrTo("DKIM record appears malformed"), + Selector: h.Selector, + Domain: h.Domain, + Record: utils.PtrTo(dkimRecord), + SigningAlgorithm: signingAlgorithmPtr(h.Algorithm), + Valid: false, + Error: utils.PtrTo("DKIM record appears malformed"), } } + tags := parseDKIMTags(dkimRecord) + + keyType := tags["k"] + if keyType == "" { + keyType = "rsa" // RFC 6376 default + } + + var hashAlgorithms []string + if h, ok := tags["h"]; ok && h != "" { + for _, alg := range strings.Split(h, ":") { + if a := strings.TrimSpace(alg); a != "" { + hashAlgorithms = append(hashAlgorithms, a) + } + } + } + if hashAlgorithms == nil { + hashAlgorithms = []string{} + } + return &model.DKIMRecord{ - Selector: selector, - Domain: domain, - Record: &dkimRecord, - Valid: true, + Selector: h.Selector, + Domain: h.Domain, + Record: &dkimRecord, + KeyType: utils.PtrTo(keyType), + HashAlgorithms: &hashAlgorithms, + SigningAlgorithm: signingAlgorithmPtr(h.Algorithm), + KeySize: parseKeySize(keyType, tags["p"]), + Valid: true, } } -// validateDKIM performs basic DKIM record validation +func signingAlgorithmPtr(a string) *string { + if a == "" { + return nil + } + return &a +} + +// validateDKIM performs basic DKIM record validation. func (d *DNSAnalyzer) validateDKIM(record string) bool { - // Should contain p= tag (public key) if !strings.Contains(record, "p=") { return false } - // Often contains v=DKIM1 but not required - // If v= is present, it should be DKIM1 + // If v= is present, it must be DKIM1 if strings.Contains(record, "v=") && !strings.Contains(record, "v=DKIM1") { return false } @@ -128,21 +203,57 @@ func (d *DNSAnalyzer) validateDKIM(record string) bool { } func (d *DNSAnalyzer) calculateDKIMScore(results *model.DNSResults) (score int) { - // DKIM provides strong email authentication - if results.DkimRecords != nil && len(*results.DkimRecords) > 0 { - hasValidDKIM := false - for _, dkim := range *results.DkimRecords { - if dkim.Valid { - hasValidDKIM = true - break + if results.DkimRecords == nil || len(*results.DkimRecords) == 0 { + return 0 + } + + hasValid := false + for _, dkim := range *results.DkimRecords { + if dkim.Valid { + hasValid = true + break + } + } + + if !hasValid { + return 25 + } + + score = 100 + + // Apply security penalties on the best valid record + for _, dkim := range *results.DkimRecords { + if !dkim.Valid { + continue + } + + // SHA-1 signing is deprecated (RFC 8301) + if dkim.SigningAlgorithm != nil && strings.HasSuffix(*dkim.SigningAlgorithm, "-sha1") { + if score > 60 { + score = 60 } } - if hasValidDKIM { - score += 100 - } else { - // Partial credit if DKIM record exists but has issues - score += 25 + + // Key size penalties apply only to RSA + keyType := "" + if dkim.KeyType != nil { + keyType = strings.ToLower(*dkim.KeyType) } + if keyType == "rsa" || keyType == "" { + if dkim.KeySize != nil { + switch { + case *dkim.KeySize < 1024: + if score > 25 { + score = 25 + } + case *dkim.KeySize < 2048: + if score > 75 { + score = 75 + } + } + } + } + // Ed25519 keys (256-bit curve, ~3000-bit RSA equivalent) need no penalty. } return diff --git a/pkg/analyzer/dns_dkim_test.go b/pkg/analyzer/dns_dkim_test.go index 45da53c..40e28a5 100644 --- a/pkg/analyzer/dns_dkim_test.go +++ b/pkg/analyzer/dns_dkim_test.go @@ -22,6 +22,10 @@ package analyzer import ( + "crypto/rand" + "crypto/rsa" + "crypto/x509" + "encoding/base64" "testing" "time" ) @@ -47,56 +51,56 @@ func TestParseDKIMSignatures(t *testing.T) { signatures: []string{ `v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:subject:date:message-id; bh=abcdef1234567890=; b=SIGNATURE_DATA_HERE==`, }, - expected: []DKIMHeader{{Domain: "gmail.com", Selector: "20210112"}}, + expected: []DKIMHeader{{Domain: "gmail.com", Selector: "20210112", Algorithm: "rsa-sha256"}}, }, { name: "Microsoft 365 style", signatures: []string{ `v=1; a=rsa-sha256; c=relaxed/relaxed; d=contoso.com; s=selector1; h=From:Date:Subject:Message-ID; bh=UErATeHehIIPIXPeUA==; b=SIGNATURE_DATA==`, }, - expected: []DKIMHeader{{Domain: "contoso.com", Selector: "selector1"}}, + expected: []DKIMHeader{{Domain: "contoso.com", Selector: "selector1", Algorithm: "rsa-sha256"}}, }, { name: "Tab-folded multiline (Postfix-style)", signatures: []string{ "v=1; a=rsa-sha256; c=relaxed/simple; d=nemunai.re; s=thot;\r\n\tt=1760866834; bh=YNB7c8Qgm8YGn9X1FAXTcdpO7t4YSZFiMrmpCfD/3zw=;\r\n\th=From:To:Subject;\r\n\tb=T4TFaypMpsHGYCl3PGLwmzOYRF11rYjC7lF8V5VFU+ldvG8WBpFn==", }, - expected: []DKIMHeader{{Domain: "nemunai.re", Selector: "thot"}}, + expected: []DKIMHeader{{Domain: "nemunai.re", Selector: "thot", Algorithm: "rsa-sha256"}}, }, { name: "Space-folded multiline (RFC-style)", signatures: []string{ "v=1; a=rsa-sha256; c=relaxed/relaxed;\r\n d=football.example.com; i=@football.example.com;\r\n q=dns/txt; s=test; t=1528637909; h=from:to:subject;\r\n bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=;\r\n b=F45dVWDfMbQDGHJFlXUNB2HKfbCeLRyhDXgFpEL8Gwps==", }, - expected: []DKIMHeader{{Domain: "football.example.com", Selector: "test"}}, + expected: []DKIMHeader{{Domain: "football.example.com", Selector: "test", Algorithm: "rsa-sha256"}}, }, { name: "d= and s= on separate continuation lines", signatures: []string{ "v=1; a=rsa-sha256;\r\n\tc=relaxed/relaxed;\r\n\td=mycompany.com;\r\n\ts=selector1;\r\n\tbh=hash=;\r\n\tb=sig==", }, - expected: []DKIMHeader{{Domain: "mycompany.com", Selector: "selector1"}}, + expected: []DKIMHeader{{Domain: "mycompany.com", Selector: "selector1", Algorithm: "rsa-sha256"}}, }, { name: "No space after semicolons", signatures: []string{ `v=1;a=rsa-sha256;c=relaxed/relaxed;d=example.net;s=mail;h=from:to:subject;bh=abc=;b=xyz==`, }, - expected: []DKIMHeader{{Domain: "example.net", Selector: "mail"}}, + expected: []DKIMHeader{{Domain: "example.net", Selector: "mail", Algorithm: "rsa-sha256"}}, }, { name: "Multiple spaces after semicolons", signatures: []string{ `v=1; a=rsa-sha256; c=relaxed/relaxed; d=example.com; s=myselector; bh=hash=; b=sig==`, }, - expected: []DKIMHeader{{Domain: "example.com", Selector: "myselector"}}, + expected: []DKIMHeader{{Domain: "example.com", Selector: "myselector", Algorithm: "rsa-sha256"}}, }, { name: "Ed25519 signature (RFC 8463)", signatures: []string{ "v=1; a=ed25519-sha256; c=relaxed/relaxed;\r\n d=football.example.com; i=@football.example.com;\r\n q=dns/txt; s=brisbane; t=1528637909; h=from:to:subject;\r\n bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=;\r\n b=/gCrinpcQOoIfuHNQIbq4pgh9kyIK3AQ==", }, - expected: []DKIMHeader{{Domain: "football.example.com", Selector: "brisbane"}}, + expected: []DKIMHeader{{Domain: "football.example.com", Selector: "brisbane", Algorithm: "ed25519-sha256"}}, }, { name: "Multiple signatures (ESP double-signing)", @@ -105,8 +109,8 @@ func TestParseDKIMSignatures(t *testing.T) { `v=1; a=rsa-sha256; c=relaxed/relaxed; d=sendib.com; s=mail; h=from:to:subject; bh=hash1=; b=sig2==`, }, expected: []DKIMHeader{ - {Domain: "mydomain.com", Selector: "mail"}, - {Domain: "sendib.com", Selector: "mail"}, + {Domain: "mydomain.com", Selector: "mail", Algorithm: "rsa-sha256"}, + {Domain: "sendib.com", Selector: "mail", Algorithm: "rsa-sha256"}, }, }, { @@ -116,8 +120,8 @@ func TestParseDKIMSignatures(t *testing.T) { `v=1; a=rsa-sha256; c=relaxed/relaxed; d=football.example.com; s=test; h=from:to:subject; bh=hash=; b=rsaSig==`, }, expected: []DKIMHeader{ - {Domain: "football.example.com", Selector: "brisbane"}, - {Domain: "football.example.com", Selector: "test"}, + {Domain: "football.example.com", Selector: "brisbane", Algorithm: "ed25519-sha256"}, + {Domain: "football.example.com", Selector: "test", Algorithm: "rsa-sha256"}, }, }, { @@ -127,8 +131,8 @@ func TestParseDKIMSignatures(t *testing.T) { `v=1; a=rsa-sha256; c=relaxed/simple; d=customerdomain.io; s=ug7nbtf4gccmlpwj322ax3p6ow6fovbt; h=from:to:subject; bh=sesHash=; b=customSig==`, }, expected: []DKIMHeader{ - {Domain: "amazonses.com", Selector: "224i4yxa5dv7c2xz3womw6peuabd"}, - {Domain: "customerdomain.io", Selector: "ug7nbtf4gccmlpwj322ax3p6ow6fovbt"}, + {Domain: "amazonses.com", Selector: "224i4yxa5dv7c2xz3womw6peuabd", Algorithm: "rsa-sha256"}, + {Domain: "customerdomain.io", Selector: "ug7nbtf4gccmlpwj322ax3p6ow6fovbt", Algorithm: "rsa-sha256"}, }, }, { @@ -136,56 +140,56 @@ func TestParseDKIMSignatures(t *testing.T) { signatures: []string{ `v=1; a=rsa-sha256; c=relaxed/relaxed; d=mail.example.co.uk; s=dkim2025; h=from:to:subject; bh=hash=; b=sig==`, }, - expected: []DKIMHeader{{Domain: "mail.example.co.uk", Selector: "dkim2025"}}, + expected: []DKIMHeader{{Domain: "mail.example.co.uk", Selector: "dkim2025", Algorithm: "rsa-sha256"}}, }, { name: "Deeply nested subdomain", signatures: []string{ `v=1; a=rsa-sha256; c=relaxed/relaxed; d=bounce.transactional.mail.example.com; s=s2048; h=from:to:subject; bh=hash=; b=sig==`, }, - expected: []DKIMHeader{{Domain: "bounce.transactional.mail.example.com", Selector: "s2048"}}, + expected: []DKIMHeader{{Domain: "bounce.transactional.mail.example.com", Selector: "s2048", Algorithm: "rsa-sha256"}}, }, { name: "Selector with hyphens (Microsoft 365 custom domain style)", signatures: []string{ `v=1; a=rsa-sha256; c=relaxed/relaxed; d=example.com; s=selector1-contoso-com; h=from:to:subject; bh=hash=; b=sig==`, }, - expected: []DKIMHeader{{Domain: "example.com", Selector: "selector1-contoso-com"}}, + expected: []DKIMHeader{{Domain: "example.com", Selector: "selector1-contoso-com", Algorithm: "rsa-sha256"}}, }, { name: "Selector with dots", signatures: []string{ `v=1; a=rsa-sha256; c=relaxed/relaxed; d=example.com; s=smtp.mail; h=from:to:subject; bh=hash=; b=sig==`, }, - expected: []DKIMHeader{{Domain: "example.com", Selector: "smtp.mail"}}, + expected: []DKIMHeader{{Domain: "example.com", Selector: "smtp.mail", Algorithm: "rsa-sha256"}}, }, { name: "Single-character selector", signatures: []string{ `v=1; a=rsa-sha256; c=relaxed/relaxed; d=tiny.io; s=x; h=from:to:subject; bh=hash=; b=sig==`, }, - expected: []DKIMHeader{{Domain: "tiny.io", Selector: "x"}}, + expected: []DKIMHeader{{Domain: "tiny.io", Selector: "x", Algorithm: "rsa-sha256"}}, }, { name: "Postmark-style timestamp selector, s= before d=", signatures: []string{ `v=1; a=rsa-sha1; c=relaxed/relaxed; s=20130519032151pm; d=postmarkapp.com; h=From:Date:Subject; bh=vYFvy46eesUDGJ45hyBTH30JfN4=; b=iHeFQ+7rCiSQs3DPjR2eUSZSv4i==`, }, - expected: []DKIMHeader{{Domain: "postmarkapp.com", Selector: "20130519032151pm"}}, + expected: []DKIMHeader{{Domain: "postmarkapp.com", Selector: "20130519032151pm", Algorithm: "rsa-sha1"}}, }, { name: "d= and s= at the very end", signatures: []string{ `v=1; a=rsa-sha256; c=relaxed/relaxed; h=from:to:subject; bh=hash=; b=sig==; d=example.net; s=trailing`, }, - expected: []DKIMHeader{{Domain: "example.net", Selector: "trailing"}}, + expected: []DKIMHeader{{Domain: "example.net", Selector: "trailing", Algorithm: "rsa-sha256"}}, }, { name: "Full tag set", signatures: []string{ `v=1; a=rsa-sha256; d=example.com; s=selector1; c=relaxed/simple; q=dns/txt; i=user@example.com; t=1255993973; x=1256598773; h=From:Sender:Reply-To:Subject:Date:Message-Id:To:Cc; bh=+7qxGePcmmrtZAIVQAtkSSGHfQ/ftNuvUTWJ3vXC9Zc=; b=dB85+qM+If1KGQmqMLNpqLgNtUaG5dhGjYjQD6/QXtXmViJx8tf9gLEjcHr+musLCAvr0Fsn1DA3ZLLlUxpf4AR==`, }, - expected: []DKIMHeader{{Domain: "example.com", Selector: "selector1"}}, + expected: []DKIMHeader{{Domain: "example.com", Selector: "selector1", Algorithm: "rsa-sha256"}}, }, { name: "Missing d= tag", @@ -216,8 +220,8 @@ func TestParseDKIMSignatures(t *testing.T) { `v=1; a=rsa-sha256; c=relaxed/relaxed; d=also-good.com; s=sel2; h=from:to; bh=hash=; b=sig==`, }, expected: []DKIMHeader{ - {Domain: "good.com", Selector: "sel1"}, - {Domain: "also-good.com", Selector: "sel2"}, + {Domain: "good.com", Selector: "sel1", Algorithm: "rsa-sha256"}, + {Domain: "also-good.com", Selector: "sel2", Algorithm: "rsa-sha256"}, }, }, } @@ -235,6 +239,9 @@ func TestParseDKIMSignatures(t *testing.T) { if result[i].Selector != tt.expected[i].Selector { t.Errorf("result[%d].Selector = %q, want %q", i, result[i].Selector, tt.expected[i].Selector) } + if result[i].Algorithm != tt.expected[i].Algorithm { + t.Errorf("result[%d].Algorithm = %q, want %q", i, result[i].Algorithm, tt.expected[i].Algorithm) + } } }) } @@ -284,3 +291,119 @@ func TestValidateDKIM(t *testing.T) { }) } } + +func TestParseDKIMTags(t *testing.T) { + tests := []struct { + name string + record string + wantTags map[string]string + }{ + { + name: "standard RSA record", + record: "v=DKIM1; k=rsa; p=MIIBI; h=sha256", + wantTags: map[string]string{"v": "DKIM1", "k": "rsa", "p": "MIIBI", "h": "sha256"}, + }, + { + name: "ed25519 record", + record: "v=DKIM1; k=ed25519; p=11qYAYKxCrfVS", + wantTags: map[string]string{"v": "DKIM1", "k": "ed25519", "p": "11qYAYKxCrfVS"}, + }, + { + name: "missing k= defaults", + record: "v=DKIM1; p=MIIBI", + wantTags: map[string]string{"v": "DKIM1", "p": "MIIBI"}, + }, + { + name: "empty record", + record: "", + wantTags: map[string]string{}, + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + got := parseDKIMTags(tt.record) + for key, want := range tt.wantTags { + if got[key] != want { + t.Errorf("tag %q = %q, want %q", key, got[key], want) + } + } + }) + } +} + +func TestParseKeySize(t *testing.T) { + // Generate a real RSA key for testing + rsaKey1024, _ := rsa.GenerateKey(rand.Reader, 1024) + rsaKey2048, _ := rsa.GenerateKey(rand.Reader, 2048) + + der1024, _ := x509.MarshalPKIXPublicKey(&rsaKey1024.PublicKey) + der2048, _ := x509.MarshalPKIXPublicKey(&rsaKey2048.PublicKey) + + p1024 := base64.StdEncoding.EncodeToString(der1024) + p2048 := base64.StdEncoding.EncodeToString(der2048) + + tests := []struct { + name string + keyType string + p string + want *int + }{ + { + name: "RSA 1024", + keyType: "rsa", + p: p1024, + want: intPtr(1024), + }, + { + name: "RSA 2048", + keyType: "rsa", + p: p2048, + want: intPtr(2048), + }, + { + name: "Ed25519 always 256", + keyType: "ed25519", + p: "11qYAYKxCrfVS", + want: intPtr(256), + }, + { + name: "Unknown key type", + keyType: "unknown", + p: "somedata", + want: nil, + }, + { + name: "Invalid RSA base64", + keyType: "rsa", + p: "!!!not-base64!!!", + want: nil, + }, + { + name: "Empty k= defaults to RSA", + keyType: "", + p: p2048, + want: intPtr(2048), + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + got := parseKeySize(tt.keyType, tt.p) + if tt.want == nil { + if got != nil { + t.Errorf("parseKeySize(%q, ...) = %d, want nil", tt.keyType, *got) + } + return + } + if got == nil { + t.Fatalf("parseKeySize(%q, ...) = nil, want %d", tt.keyType, *tt.want) + } + if *got != *tt.want { + t.Errorf("parseKeySize(%q, ...) = %d, want %d", tt.keyType, *got, *tt.want) + } + }) + } +} + +func intPtr(v int) *int { return &v } diff --git a/pkg/analyzer/dns_dmarc.go b/pkg/analyzer/dns_dmarc.go index 686fb0b..b89500b 100644 --- a/pkg/analyzer/dns_dmarc.go +++ b/pkg/analyzer/dns_dmarc.go @@ -24,233 +24,290 @@ package analyzer import ( "context" "fmt" - "regexp" + "net" + "strconv" "strings" "git.happydns.org/happyDeliver/internal/model" "git.happydns.org/happyDeliver/internal/utils" ) -// checkmodel.DMARCRecord looks up and validates DMARC record for a domain -func (d *DNSAnalyzer) checkDMARCRecord(domain string) *model.DMARCRecord { - // DMARC records are at: _dmarc.domain - dmarcDomain := fmt.Sprintf("_dmarc.%s", domain) +var dmarcPolicyStrength = map[string]int{"none": 0, "quarantine": 1, "reject": 2} +// lookupDMARCAt queries _dmarc. and returns the raw DMARC1 TXT record. +// notFound=true means no record exists (NXDOMAIN or empty); false means a real DNS error occurred. +func (d *DNSAnalyzer) lookupDMARCAt(domain string) (record string, notFound bool, err error) { ctx, cancel := context.WithTimeout(context.Background(), d.Timeout) defer cancel() - txtRecords, err := d.resolver.LookupTXT(ctx, dmarcDomain) + txtRecords, lookupErr := d.resolver.LookupTXT(ctx, fmt.Sprintf("_dmarc.%s", domain)) + if lookupErr != nil { + if dnsErr, ok := lookupErr.(*net.DNSError); ok && dnsErr.IsNotFound { + return "", true, nil + } + return "", false, lookupErr + } + + for _, txt := range txtRecords { + if strings.HasPrefix(txt, "v=DMARC1") { + return txt, false, nil + } + } + return "", true, nil +} + +// parseDMARCRecord parses a raw DMARC TXT record into a DMARCRecord model. +func (d *DNSAnalyzer) parseDMARCRecord(foundDomain, rawRecord string) *model.DMARCRecord { + tags := parseDKIMTags(rawRecord) + + // Policy + policy := "unknown" + switch tags["p"] { + case "none", "quarantine", "reject": + policy = tags["p"] + } + + // SPF alignment (default: relaxed) + spfAlignment := utils.PtrTo(model.DMARCRecordSpfAlignmentRelaxed) + if tags["aspf"] == "s" { + spfAlignment = utils.PtrTo(model.DMARCRecordSpfAlignmentStrict) + } + + // DKIM alignment (default: relaxed) + dkimAlignment := utils.PtrTo(model.DMARCRecordDkimAlignmentRelaxed) + if tags["adkim"] == "s" { + dkimAlignment = utils.PtrTo(model.DMARCRecordDkimAlignmentStrict) + } + + // Subdomain policy + var subdomainPolicy *model.DMARCRecordSubdomainPolicy + switch tags["sp"] { + case "none", "quarantine", "reject": + subdomainPolicy = utils.PtrTo(model.DMARCRecordSubdomainPolicy(tags["sp"])) + } + + // Non-existent subdomain policy (DMARCbis np=) + var nonexistentSubdomainPolicy *model.DMARCRecordNonexistentSubdomainPolicy + switch tags["np"] { + case "none", "quarantine", "reject": + nonexistentSubdomainPolicy = utils.PtrTo(model.DMARCRecordNonexistentSubdomainPolicy(tags["np"])) + } + + // Percentage (pct=, deprecated in DMARCbis) + var percentage *int + if pctStr, ok := tags["pct"]; ok { + if pct, err := strconv.Atoi(pctStr); err == nil && pct >= 0 && pct <= 100 { + percentage = &pct + } + } + + // Test mode (DMARCbis t=) + var testMode *bool + if t, ok := tags["t"]; ok { + v := t == "y" + testMode = &v + } + + // PSD (DMARCbis psd=) + var psd *model.DMARCRecordPsd + switch tags["psd"] { + case "y", "n", "u": + psd = utils.PtrTo(model.DMARCRecordPsd(tags["psd"])) + } + + rec := &model.DMARCRecord{ + Domain: &foundDomain, + Record: &rawRecord, + Policy: utils.PtrTo(model.DMARCRecordPolicy(policy)), + SubdomainPolicy: subdomainPolicy, + NonexistentSubdomainPolicy: nonexistentSubdomainPolicy, + Percentage: percentage, + TestMode: testMode, + Psd: psd, + SpfAlignment: spfAlignment, + DkimAlignment: dkimAlignment, + } + if percentage != nil { + rec.DeprecatedPct = utils.PtrTo(true) + } + if _, ok := tags["rf"]; ok { + rec.DeprecatedRf = utils.PtrTo(true) + } + if _, ok := tags["ri"]; ok { + rec.DeprecatedRi = utils.PtrTo(true) + } + + if !d.validateDMARC(rawRecord) { + rec.Valid = false + rec.Error = utils.PtrTo("DMARC record appears malformed") + return rec + } + + rec.Valid = true + return rec +} + +// walkDNSForDMARC implements the DMARCbis DNS Tree Walk algorithm (Section 4.10). +// It queries _dmarc. and walks up the label hierarchy until a valid DMARC +// record is found or all labels are exhausted. Maximum 8 DNS queries per message. +// For domains with ≥8 labels, after the initial miss the walk jumps to the 7-label +// suffix before resuming normally (to stay within the 8-query budget). +// Single-label (TLD) records are only accepted when they carry psd=y. +func (d *DNSAnalyzer) walkDNSForDMARC(domain string) (record, foundDomain string, err error) { + labels := strings.Split(strings.ToLower(strings.TrimSuffix(domain, ".")), ".") + n := len(labels) + + for i, queries := 0, 0; i < n && queries < 8; i, queries = i+1, queries+1 { + current := strings.Join(labels[i:], ".") + + raw, notFound, lookupErr := d.lookupDMARCAt(current) + if lookupErr != nil { + return "", "", lookupErr + } + if !notFound { + // Single-label (TLD) records are only used when the record explicitly opts in. + if !strings.Contains(current, ".") { + if d.extractDMARCPSDValue(raw) != "y" { + break + } + } + return raw, current, nil + } + + // DMARCbis §4.10: after missing on a ≥8-label domain, shortcut to the + // 7-label suffix for the next query rather than stepping one label at a time. + if i == 0 && n >= 8 { + i = n - 8 // the outer i++ will land at n-7 (7 labels from the right) + } + } + + return "", "", nil +} + +// checkDMARCRecord looks up and validates the DMARC record for a domain using +// the DMARCbis DNS Tree Walk algorithm (Section 4.10), which supersedes the +// RFC 7489 PSL-based organizational domain lookup and the RFC 9091 PSD DMARC +// experimental fallback. +func (d *DNSAnalyzer) checkDMARCRecord(domain string) *model.DMARCRecord { + raw, foundDomain, err := d.walkDNSForDMARC(domain) if err != nil { return &model.DMARCRecord{ Valid: false, Error: utils.PtrTo(fmt.Sprintf("Failed to lookup DMARC record: %v", err)), } } - - // Find DMARC record (starts with "v=DMARC1") - var dmarcRecord string - for _, txt := range txtRecords { - if strings.HasPrefix(txt, "v=DMARC1") { - dmarcRecord = txt - break - } - } - - if dmarcRecord == "" { + if foundDomain == "" { return &model.DMARCRecord{ Valid: false, Error: utils.PtrTo("No DMARC record found"), } } - - // Extract policy - policy := d.extractDMARCPolicy(dmarcRecord) - - // Extract subdomain policy - subdomainPolicy := d.extractDMARCSubdomainPolicy(dmarcRecord) - - // Extract percentage - percentage := d.extractDMARCPercentage(dmarcRecord) - - // Extract alignment modes - spfAlignment := d.extractDMARCSPFAlignment(dmarcRecord) - dkimAlignment := d.extractDMARCDKIMAlignment(dmarcRecord) - - // Basic validation - if !d.validateDMARC(dmarcRecord) { - return &model.DMARCRecord{ - Record: &dmarcRecord, - Policy: utils.PtrTo(model.DMARCRecordPolicy(policy)), - SubdomainPolicy: subdomainPolicy, - Percentage: percentage, - SpfAlignment: spfAlignment, - DkimAlignment: dkimAlignment, - Valid: false, - Error: utils.PtrTo("DMARC record appears malformed"), - } - } - - return &model.DMARCRecord{ - Record: &dmarcRecord, - Policy: utils.PtrTo(model.DMARCRecordPolicy(policy)), - SubdomainPolicy: subdomainPolicy, - Percentage: percentage, - SpfAlignment: spfAlignment, - DkimAlignment: dkimAlignment, - Valid: true, - } + return d.parseDMARCRecord(foundDomain, raw) } -// extractDMARCPolicy extracts the policy from a DMARC record -func (d *DNSAnalyzer) extractDMARCPolicy(record string) string { - // Look for p=none, p=quarantine, or p=reject - re := regexp.MustCompile(`p=(none|quarantine|reject)`) - matches := re.FindStringSubmatch(record) - if len(matches) > 1 { - return matches[1] +// extractDMARCPSDValue returns the raw psd= value ("y", "n", "u") or "" if absent. +// Used during DNS Tree Walk before full record parsing. +func (d *DNSAnalyzer) extractDMARCPSDValue(record string) string { + v := parseDKIMTags(record)["psd"] + switch v { + case "y", "n", "u": + return v } - return "unknown" + return "" } -// extractDMARCSPFAlignment extracts SPF alignment mode from a DMARC record -// Returns "relaxed" (default) or "strict" -func (d *DNSAnalyzer) extractDMARCSPFAlignment(record string) *model.DMARCRecordSpfAlignment { - // Look for aspf=s (strict) or aspf=r (relaxed) - re := regexp.MustCompile(`aspf=(r|s)`) - matches := re.FindStringSubmatch(record) - if len(matches) > 1 { - if matches[1] == "s" { - return utils.PtrTo(model.DMARCRecordSpfAlignmentStrict) - } - return utils.PtrTo(model.DMARCRecordSpfAlignmentRelaxed) - } - // Default is relaxed if not specified - return utils.PtrTo(model.DMARCRecordSpfAlignmentRelaxed) -} - -// extractDMARCDKIMAlignment extracts DKIM alignment mode from a DMARC record -// Returns "relaxed" (default) or "strict" -func (d *DNSAnalyzer) extractDMARCDKIMAlignment(record string) *model.DMARCRecordDkimAlignment { - // Look for adkim=s (strict) or adkim=r (relaxed) - re := regexp.MustCompile(`adkim=(r|s)`) - matches := re.FindStringSubmatch(record) - if len(matches) > 1 { - if matches[1] == "s" { - return utils.PtrTo(model.DMARCRecordDkimAlignmentStrict) - } - return utils.PtrTo(model.DMARCRecordDkimAlignmentRelaxed) - } - // Default is relaxed if not specified - return utils.PtrTo(model.DMARCRecordDkimAlignmentRelaxed) -} - -// extractDMARCSubdomainPolicy extracts subdomain policy from a DMARC record -// Returns the sp tag value or nil if not specified (defaults to main policy) -func (d *DNSAnalyzer) extractDMARCSubdomainPolicy(record string) *model.DMARCRecordSubdomainPolicy { - // Look for sp=none, sp=quarantine, or sp=reject - re := regexp.MustCompile(`sp=(none|quarantine|reject)`) - matches := re.FindStringSubmatch(record) - if len(matches) > 1 { - return utils.PtrTo(model.DMARCRecordSubdomainPolicy(matches[1])) - } - // If sp is not specified, it defaults to the main policy (p tag) - // Return nil to indicate it's using the default - return nil -} - -// extractDMARCPercentage extracts the percentage from a DMARC record -// Returns the pct tag value or nil if not specified (defaults to 100) -func (d *DNSAnalyzer) extractDMARCPercentage(record string) *int { - // Look for pct= - re := regexp.MustCompile(`pct=(\d+)`) - matches := re.FindStringSubmatch(record) - if len(matches) > 1 { - // Convert string to int - var pct int - fmt.Sscanf(matches[1], "%d", &pct) - // Validate range (0-100) - if pct >= 0 && pct <= 100 { - return &pct - } - } - // Default is 100 if not specified - return nil -} - -// validateDMARC performs basic DMARC record validation +// validateDMARC performs basic DMARC record validation. +// Per DMARCbis, p= is now RECOMMENDED (not required): a record with a valid +// rua= but no p= is treated as p=none and considered valid. func (d *DNSAnalyzer) validateDMARC(record string) bool { - // Must start with v=DMARC1 if !strings.HasPrefix(record, "v=DMARC1") { return false } - // Must have a policy tag + // p= absent is allowed in DMARCbis when rua= is present (treated as p=none). if !strings.Contains(record, "p=") { - return false + return strings.Contains(record, "rua=") } return true } func (d *DNSAnalyzer) calculateDMARCScore(results *model.DNSResults) (score int) { - // DMARC ties SPF and DKIM together and provides policy - if results.DmarcRecord != nil { - if results.DmarcRecord.Valid { - score += 50 - // Bonus points for stricter policies - if results.DmarcRecord.Policy != nil { - switch *results.DmarcRecord.Policy { - case "reject": - // Strictest policy - full points already awarded - score += 25 - case "quarantine": - // Good policy - no deduction - case "none": - // Weakest policy - deduct 5 points - score -= 25 - } - } - // Bonus points for strict alignment modes (2 points each) - if results.DmarcRecord.SpfAlignment != nil && *results.DmarcRecord.SpfAlignment == model.DMARCRecordSpfAlignmentStrict { - score += 5 - } - if results.DmarcRecord.DkimAlignment != nil && *results.DmarcRecord.DkimAlignment == model.DMARCRecordDkimAlignmentStrict { - score += 5 - } - // Subdomain policy scoring (sp tag) - // +3 for stricter or equal subdomain policy, -3 for weaker - if results.DmarcRecord.SubdomainPolicy != nil { - mainPolicy := string(*results.DmarcRecord.Policy) - subPolicy := string(*results.DmarcRecord.SubdomainPolicy) + if results.DmarcRecord == nil { + return + } - // Policy strength: none < quarantine < reject - policyStrength := map[string]int{"none": 0, "quarantine": 1, "reject": 2} - - mainStrength := policyStrength[mainPolicy] - subStrength := policyStrength[subPolicy] - - if subStrength >= mainStrength { - // Subdomain policy is equal or stricter - score += 15 - } else { - // Subdomain policy is weaker - score -= 15 - } - } else { - // No sp tag means subdomains inherit main policy (good default) - score += 15 - } - // Percentage scoring (pct tag) - // Apply the percentage on the current score - if results.DmarcRecord.Percentage != nil { - pct := *results.DmarcRecord.Percentage - - score = score * pct / 100 - } - } else if results.DmarcRecord.Record != nil { - // Partial credit if DMARC record exists but has issues + if !results.DmarcRecord.Valid { + if results.DmarcRecord.Record != nil { + // Partial credit if a DMARC record exists but has issues score += 20 } + return + } + + score += 50 + + // Determine effective policy: DMARCbis t=y downgrades policy one level. + effectivePolicy := "none" + if results.DmarcRecord.Policy != nil { + effectivePolicy = string(*results.DmarcRecord.Policy) + } + testMode := results.DmarcRecord.TestMode != nil && *results.DmarcRecord.TestMode + if testMode { + switch effectivePolicy { + case "reject": + effectivePolicy = "quarantine" + case "quarantine": + effectivePolicy = "none" + } + } + + // Bonus/penalty for policy strength + switch effectivePolicy { + case "reject": + score += 25 + case "none": + score -= 25 + } + + // Bonus points for strict alignment modes + if results.DmarcRecord.SpfAlignment != nil && *results.DmarcRecord.SpfAlignment == model.DMARCRecordSpfAlignmentStrict { + score += 5 + } + if results.DmarcRecord.DkimAlignment != nil && *results.DmarcRecord.DkimAlignment == model.DMARCRecordDkimAlignmentStrict { + score += 5 + } + + // Subdomain policy scoring (sp tag): +15 for equal-or-stricter, -15 for weaker + if results.DmarcRecord.SubdomainPolicy != nil { + subPolicy := string(*results.DmarcRecord.SubdomainPolicy) + if dmarcPolicyStrength[subPolicy] >= dmarcPolicyStrength[effectivePolicy] { + score += 15 + } else { + score -= 15 + } + } else { + score += 15 // inherits main policy — good default + } + + // Non-existent subdomain policy scoring (np tag, DMARCbis): +15 for equal-or-stricter, -15 for weaker + effectiveSubPolicy := effectivePolicy + if results.DmarcRecord.SubdomainPolicy != nil { + effectiveSubPolicy = string(*results.DmarcRecord.SubdomainPolicy) + } + if results.DmarcRecord.NonexistentSubdomainPolicy == nil { + score += 15 // inherits subdomain/main policy — good default + } else if dmarcPolicyStrength[string(*results.DmarcRecord.NonexistentSubdomainPolicy)] >= dmarcPolicyStrength[effectiveSubPolicy] { + score += 15 + } else { + score -= 15 + } + + // pct= scaling (deprecated in DMARCbis, kept for backward compatibility). + // pct=0 is an anti-pattern: score it as zero enforcement. + if results.DmarcRecord.Percentage != nil { + pct := *results.DmarcRecord.Percentage + score = score * pct / 100 } return diff --git a/pkg/analyzer/dns_dmarc_test.go b/pkg/analyzer/dns_dmarc_test.go index 93f4511..5c34a32 100644 --- a/pkg/analyzer/dns_dmarc_test.go +++ b/pkg/analyzer/dns_dmarc_test.go @@ -22,14 +22,206 @@ package analyzer import ( + "context" + "fmt" + "net" "testing" "time" - "git.happydns.org/happyDeliver/internal/model" "git.happydns.org/happyDeliver/internal/utils" ) -func TestExtractDMARCPolicy(t *testing.T) { +// mockDNSResolver maps domain names to TXT records for testing. +// An entry with value nil means NXDOMAIN; an error value triggers a DNS error. +type mockDNSResolver struct { + txt map[string][]string + err map[string]error +} + +func (m *mockDNSResolver) LookupTXT(_ context.Context, name string) ([]string, error) { + if err, ok := m.err[name]; ok { + return nil, err + } + if records, ok := m.txt[name]; ok { + return records, nil + } + return nil, &net.DNSError{Err: "no such host", Name: name, IsNotFound: true} +} + +func (m *mockDNSResolver) LookupMX(_ context.Context, _ string) ([]*net.MX, error) { + return nil, nil +} +func (m *mockDNSResolver) LookupAddr(_ context.Context, _ string) ([]string, error) { + return nil, nil +} +func (m *mockDNSResolver) LookupHost(_ context.Context, _ string) ([]string, error) { + return nil, nil +} + +func newMockAnalyzer(txt map[string][]string, errMap map[string]error) *DNSAnalyzer { + if errMap == nil { + errMap = map[string]error{} + } + return NewDNSAnalyzerWithResolver(5*time.Second, &mockDNSResolver{txt: txt, err: errMap}) +} + +func TestCheckDMARCRecordFallback(t *testing.T) { + const orgRecord = "v=DMARC1; p=quarantine; rua=mailto:dmarc@example.com" + const subRecord = "v=DMARC1; p=reject" + const psdRecord = "v=DMARC1; p=none; psd=y" + + tests := []struct { + name string + domain string + txt map[string][]string + errMap map[string]error + wantValid bool + wantDomain *string + wantErrSubst string + }{ + { + name: "exact domain has DMARC record — no fallback", + domain: "mail.example.com", + txt: map[string][]string{ + "_dmarc.mail.example.com": {subRecord}, + "_dmarc.example.com": {orgRecord}, + }, + wantValid: true, + wantDomain: utils.PtrTo("mail.example.com"), + }, + { + name: "exact domain NXDOMAIN — tree walk reaches org domain", + domain: "mail.example.com", + txt: map[string][]string{ + "_dmarc.example.com": {orgRecord}, + }, + wantValid: true, + wantDomain: utils.PtrTo("example.com"), + }, + { + name: "exact domain has no v=DMARC1 TXT — tree walk reaches org domain", + domain: "mail.example.com", + txt: map[string][]string{ + "_dmarc.mail.example.com": {"some-other-txt"}, + "_dmarc.example.com": {orgRecord}, + }, + wantValid: true, + wantDomain: utils.PtrTo("example.com"), + }, + { + name: "both exact and org NXDOMAIN but PSD (TLD) has psd=y — DMARCbis Tree Walk", + domain: "mail.example.com", + txt: map[string][]string{ + "_dmarc.com": {psdRecord}, + }, + wantValid: true, + wantDomain: utils.PtrTo("com"), + }, + { + name: "PSD record exists but no psd=y — TLD record ignored by Tree Walk", + domain: "mail.example.com", + txt: map[string][]string{ + "_dmarc.com": {"v=DMARC1; p=none"}, + }, + wantValid: false, + wantErrSubst: "No DMARC record found", + }, + { + name: "no record at any level", + domain: "mail.example.com", + txt: map[string][]string{}, + wantValid: false, + wantErrSubst: "No DMARC record found", + }, + { + name: "DNS error on exact domain — error returned", + domain: "mail.example.com", + errMap: map[string]error{ + "_dmarc.mail.example.com": fmt.Errorf("SERVFAIL"), + }, + wantValid: false, + wantErrSubst: "SERVFAIL", + }, + { + name: "domain already at org level — found immediately", + domain: "example.com", + txt: map[string][]string{ + "_dmarc.example.com": {orgRecord}, + }, + wantValid: true, + wantDomain: utils.PtrTo("example.com"), + }, + { + name: "deep subdomain — tree walk finds record two levels up", + domain: "a.b.example.com", + txt: map[string][]string{ + "_dmarc.example.com": {orgRecord}, + }, + wantValid: true, + wantDomain: utils.PtrTo("example.com"), + }, + { + name: "8-label domain — shortcut to 7-label suffix on miss", + domain: "a.b.c.d.e.f.example.com", + txt: map[string][]string{ + "_dmarc.b.c.d.e.f.example.com": {orgRecord}, + }, + wantValid: true, + wantDomain: utils.PtrTo("b.c.d.e.f.example.com"), + }, + { + name: "psd=n record stops tree walk at that level", + domain: "mail.sub.example.com", + txt: map[string][]string{ + "_dmarc.sub.example.com": {"v=DMARC1; p=reject; psd=n"}, + }, + wantValid: true, + wantDomain: utils.PtrTo("sub.example.com"), + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + analyzer := newMockAnalyzer(tt.txt, tt.errMap) + result := analyzer.checkDMARCRecord(tt.domain) + + if result.Valid != tt.wantValid { + t.Errorf("Valid = %v, want %v", result.Valid, tt.wantValid) + } + if tt.wantDomain != nil { + if result.Domain == nil { + t.Fatalf("Domain = nil, want %q", *tt.wantDomain) + } + if *result.Domain != *tt.wantDomain { + t.Errorf("Domain = %q, want %q", *result.Domain, *tt.wantDomain) + } + } + if tt.wantErrSubst != "" { + if result.Error == nil { + t.Fatalf("Error = nil, want substring %q", tt.wantErrSubst) + } + if !contains(*result.Error, tt.wantErrSubst) { + t.Errorf("Error = %q, want substring %q", *result.Error, tt.wantErrSubst) + } + } + }) + } +} + +func contains(s, substr string) bool { + return len(s) >= len(substr) && (s == substr || len(s) > 0 && containsStr(s, substr)) +} + +func containsStr(s, sub string) bool { + for i := 0; i <= len(s)-len(sub); i++ { + if s[i:i+len(sub)] == sub { + return true + } + } + return false +} + +func TestParseDMARCRecordPolicy(t *testing.T) { tests := []struct { name string record string @@ -61,9 +253,135 @@ func TestExtractDMARCPolicy(t *testing.T) { for _, tt := range tests { t.Run(tt.name, func(t *testing.T) { - result := analyzer.extractDMARCPolicy(tt.record) - if result != tt.expectedPolicy { - t.Errorf("extractDMARCPolicy(%q) = %q, want %q", tt.record, result, tt.expectedPolicy) + rec := analyzer.parseDMARCRecord("example.com", tt.record) + if rec.Policy == nil { + t.Fatalf("parseDMARCRecord(%q).Policy = nil", tt.record) + } + if string(*rec.Policy) != tt.expectedPolicy { + t.Errorf("parseDMARCRecord(%q).Policy = %q, want %q", tt.record, string(*rec.Policy), tt.expectedPolicy) + } + }) + } +} + +func TestParseDMARCRecordTestMode(t *testing.T) { + tests := []struct { + name string + record string + wantMode *bool + }{ + { + name: "t=y sets test mode", + record: "v=DMARC1; p=reject; t=y", + wantMode: utils.PtrTo(true), + }, + { + name: "t=n explicitly disables test mode", + record: "v=DMARC1; p=reject; t=n", + wantMode: utils.PtrTo(false), + }, + { + name: "absent t tag returns nil", + record: "v=DMARC1; p=quarantine; rua=mailto:dmarc@example.com", + wantMode: nil, + }, + } + + analyzer := NewDNSAnalyzer(5 * time.Second) + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + result := analyzer.parseDMARCRecord("example.com", tt.record).TestMode + if tt.wantMode == nil { + if result != nil { + t.Errorf("parseDMARCRecord(%q).TestMode = %v, want nil", tt.record, *result) + } + } else { + if result == nil { + t.Fatalf("parseDMARCRecord(%q).TestMode = nil, want %v", tt.record, *tt.wantMode) + } + if *result != *tt.wantMode { + t.Errorf("parseDMARCRecord(%q).TestMode = %v, want %v", tt.record, *result, *tt.wantMode) + } + } + }) + } +} + +func TestParseDMARCRecordPSD(t *testing.T) { + tests := []struct { + name string + record string + wantPSD *string + }{ + { + name: "psd=y marks Public Suffix Domain", + record: "v=DMARC1; p=none; psd=y", + wantPSD: utils.PtrTo("y"), + }, + { + name: "psd=n marks Org Domain boundary", + record: "v=DMARC1; p=reject; psd=n", + wantPSD: utils.PtrTo("n"), + }, + { + name: "psd=u is explicit unknown", + record: "v=DMARC1; p=quarantine; psd=u", + wantPSD: utils.PtrTo("u"), + }, + { + name: "absent psd tag returns nil", + record: "v=DMARC1; p=quarantine; rua=mailto:dmarc@example.com", + wantPSD: nil, + }, + } + + analyzer := NewDNSAnalyzer(5 * time.Second) + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + result := analyzer.parseDMARCRecord("example.com", tt.record).Psd + if tt.wantPSD == nil { + if result != nil { + t.Errorf("parseDMARCRecord(%q).Psd = %v, want nil", tt.record, *result) + } + } else { + if result == nil { + t.Fatalf("parseDMARCRecord(%q).Psd = nil, want %q", tt.record, *tt.wantPSD) + } + if string(*result) != *tt.wantPSD { + t.Errorf("parseDMARCRecord(%q).Psd = %q, want %q", tt.record, string(*result), *tt.wantPSD) + } + } + }) + } +} + +func TestParseDMARCRecordDeprecatedTags(t *testing.T) { + tests := []struct { + name string + record string + wantRf bool + wantRi bool + }{ + {name: "rf tag present", record: "v=DMARC1; p=none; rf=afrf", wantRf: true, wantRi: false}, + {name: "ri tag present", record: "v=DMARC1; p=none; ri=86400", wantRf: false, wantRi: true}, + {name: "rf tag absent", record: "v=DMARC1; p=quarantine; rua=mailto:x@example.com", wantRf: false, wantRi: false}, + {name: "ri tag absent", record: "v=DMARC1; p=quarantine", wantRf: false, wantRi: false}, + } + + analyzer := NewDNSAnalyzer(5 * time.Second) + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + rec := analyzer.parseDMARCRecord("example.com", tt.record) + gotRf := rec.DeprecatedRf != nil && *rec.DeprecatedRf + gotRi := rec.DeprecatedRi != nil && *rec.DeprecatedRi + if gotRf != tt.wantRf { + t.Errorf("parseDMARCRecord(%q).DeprecatedRf = %v, want %v", tt.record, gotRf, tt.wantRf) + } + if gotRi != tt.wantRi { + t.Errorf("parseDMARCRecord(%q).DeprecatedRi = %v, want %v", tt.record, gotRi, tt.wantRi) } }) } @@ -85,13 +403,18 @@ func TestValidateDMARC(t *testing.T) { record: "v=DMARC1; p=none", expected: true, }, + { + name: "DMARCbis: p= absent but rua= present is valid (treated as p=none)", + record: "v=DMARC1; rua=mailto:dmarc@example.com", + expected: true, + }, { name: "Invalid DMARC - no version", record: "p=quarantine", expected: false, }, { - name: "Invalid DMARC - no policy", + name: "Invalid DMARC - no policy and no rua", record: "v=DMARC1", expected: false, }, @@ -114,142 +437,36 @@ func TestValidateDMARC(t *testing.T) { } } -func TestExtractDMARCSPFAlignment(t *testing.T) { - tests := []struct { - name string - record string - expectedAlignment string - }{ - { - name: "SPF alignment - strict", - record: "v=DMARC1; p=quarantine; aspf=s", - expectedAlignment: "strict", - }, - { - name: "SPF alignment - relaxed (explicit)", - record: "v=DMARC1; p=quarantine; aspf=r", - expectedAlignment: "relaxed", - }, - { - name: "SPF alignment - relaxed (default, not specified)", - record: "v=DMARC1; p=quarantine", - expectedAlignment: "relaxed", - }, - { - name: "Both alignments specified - check SPF strict", - record: "v=DMARC1; p=quarantine; aspf=s; adkim=r", - expectedAlignment: "strict", - }, - { - name: "Both alignments specified - check SPF relaxed", - record: "v=DMARC1; p=quarantine; aspf=r; adkim=s", - expectedAlignment: "relaxed", - }, - { - name: "Complex record with SPF strict", - record: "v=DMARC1; p=reject; rua=mailto:dmarc@example.com; aspf=s; adkim=s; pct=100", - expectedAlignment: "strict", - }, - } - - analyzer := NewDNSAnalyzer(5 * time.Second) - - for _, tt := range tests { - t.Run(tt.name, func(t *testing.T) { - result := analyzer.extractDMARCSPFAlignment(tt.record) - if result == nil { - t.Fatalf("extractDMARCSPFAlignment(%q) returned nil, expected non-nil", tt.record) - } - if string(*result) != tt.expectedAlignment { - t.Errorf("extractDMARCSPFAlignment(%q) = %q, want %q", tt.record, string(*result), tt.expectedAlignment) - } - }) - } -} - -func TestExtractDMARCDKIMAlignment(t *testing.T) { - tests := []struct { - name string - record string - expectedAlignment string - }{ - { - name: "DKIM alignment - strict", - record: "v=DMARC1; p=reject; adkim=s", - expectedAlignment: "strict", - }, - { - name: "DKIM alignment - relaxed (explicit)", - record: "v=DMARC1; p=reject; adkim=r", - expectedAlignment: "relaxed", - }, - { - name: "DKIM alignment - relaxed (default, not specified)", - record: "v=DMARC1; p=none", - expectedAlignment: "relaxed", - }, - { - name: "Both alignments specified - check DKIM strict", - record: "v=DMARC1; p=quarantine; aspf=r; adkim=s", - expectedAlignment: "strict", - }, - { - name: "Both alignments specified - check DKIM relaxed", - record: "v=DMARC1; p=quarantine; aspf=s; adkim=r", - expectedAlignment: "relaxed", - }, - { - name: "Complex record with DKIM strict", - record: "v=DMARC1; p=reject; rua=mailto:dmarc@example.com; aspf=r; adkim=s; pct=100", - expectedAlignment: "strict", - }, - } - - analyzer := NewDNSAnalyzer(5 * time.Second) - - for _, tt := range tests { - t.Run(tt.name, func(t *testing.T) { - result := analyzer.extractDMARCDKIMAlignment(tt.record) - if result == nil { - t.Fatalf("extractDMARCDKIMAlignment(%q) returned nil, expected non-nil", tt.record) - } - if string(*result) != tt.expectedAlignment { - t.Errorf("extractDMARCDKIMAlignment(%q) = %q, want %q", tt.record, string(*result), tt.expectedAlignment) - } - }) - } -} - -func TestExtractDMARCSubdomainPolicy(t *testing.T) { +func TestParseDMARCRecordAlignment(t *testing.T) { tests := []struct { name string record string - expectedPolicy *string + expectedSPF string + expectedDKIM string }{ { - name: "Subdomain policy - none", - record: "v=DMARC1; p=quarantine; sp=none", - expectedPolicy: utils.PtrTo("none"), + name: "SPF strict, DKIM relaxed", + record: "v=DMARC1; p=quarantine; aspf=s; adkim=r", + expectedSPF: "strict", + expectedDKIM: "relaxed", }, { - name: "Subdomain policy - quarantine", - record: "v=DMARC1; p=reject; sp=quarantine", - expectedPolicy: utils.PtrTo("quarantine"), + name: "SPF relaxed explicit, DKIM strict", + record: "v=DMARC1; p=quarantine; aspf=r; adkim=s", + expectedSPF: "relaxed", + expectedDKIM: "strict", }, { - name: "Subdomain policy - reject", - record: "v=DMARC1; p=quarantine; sp=reject", - expectedPolicy: utils.PtrTo("reject"), + name: "Defaults when neither specified", + record: "v=DMARC1; p=quarantine", + expectedSPF: "relaxed", + expectedDKIM: "relaxed", }, { - name: "No subdomain policy specified (defaults to main policy)", - record: "v=DMARC1; p=quarantine", - expectedPolicy: nil, - }, - { - name: "Complex record with subdomain policy", - record: "v=DMARC1; p=reject; sp=quarantine; rua=mailto:dmarc@example.com; pct=100", - expectedPolicy: utils.PtrTo("quarantine"), + name: "Both strict in complex record", + record: "v=DMARC1; p=reject; rua=mailto:dmarc@example.com; aspf=s; adkim=s; pct=100", + expectedSPF: "strict", + expectedDKIM: "strict", }, } @@ -257,86 +474,117 @@ func TestExtractDMARCSubdomainPolicy(t *testing.T) { for _, tt := range tests { t.Run(tt.name, func(t *testing.T) { - result := analyzer.extractDMARCSubdomainPolicy(tt.record) - if tt.expectedPolicy == nil { - if result != nil { - t.Errorf("extractDMARCSubdomainPolicy(%q) = %v, want nil", tt.record, result) + rec := analyzer.parseDMARCRecord("example.com", tt.record) + if rec.SpfAlignment == nil { + t.Fatalf("parseDMARCRecord(%q).SpfAlignment = nil", tt.record) + } + if string(*rec.SpfAlignment) != tt.expectedSPF { + t.Errorf("SpfAlignment = %q, want %q", string(*rec.SpfAlignment), tt.expectedSPF) + } + if rec.DkimAlignment == nil { + t.Fatalf("parseDMARCRecord(%q).DkimAlignment = nil", tt.record) + } + if string(*rec.DkimAlignment) != tt.expectedDKIM { + t.Errorf("DkimAlignment = %q, want %q", string(*rec.DkimAlignment), tt.expectedDKIM) + } + }) + } +} + +func TestParseDMARCRecordSubdomainPolicy(t *testing.T) { + tests := []struct { + name string + record string + expectedSP *string + expectedNP *string + }{ + { + name: "sp=none, no np", + record: "v=DMARC1; p=quarantine; sp=none", + expectedSP: utils.PtrTo("none"), + expectedNP: nil, + }, + { + name: "sp=reject, np=reject", + record: "v=DMARC1; p=reject; sp=quarantine; np=reject; rua=mailto:dmarc@example.com; pct=100", + expectedSP: utils.PtrTo("quarantine"), + expectedNP: utils.PtrTo("reject"), + }, + { + name: "No sp or np (both default)", + record: "v=DMARC1; p=quarantine", + expectedSP: nil, + expectedNP: nil, + }, + { + name: "np=quarantine, no sp", + record: "v=DMARC1; p=reject; np=quarantine", + expectedSP: nil, + expectedNP: utils.PtrTo("quarantine"), + }, + } + + analyzer := NewDNSAnalyzer(5 * time.Second) + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + rec := analyzer.parseDMARCRecord("example.com", tt.record) + if tt.expectedSP == nil { + if rec.SubdomainPolicy != nil { + t.Errorf("parseDMARCRecord(%q).SubdomainPolicy = %v, want nil", tt.record, *rec.SubdomainPolicy) } } else { - if result == nil { - t.Fatalf("extractDMARCSubdomainPolicy(%q) returned nil, expected %q", tt.record, *tt.expectedPolicy) + if rec.SubdomainPolicy == nil { + t.Fatalf("parseDMARCRecord(%q).SubdomainPolicy = nil, want %q", tt.record, *tt.expectedSP) } - if string(*result) != *tt.expectedPolicy { - t.Errorf("extractDMARCSubdomainPolicy(%q) = %q, want %q", tt.record, string(*result), *tt.expectedPolicy) + if string(*rec.SubdomainPolicy) != *tt.expectedSP { + t.Errorf("SubdomainPolicy = %q, want %q", string(*rec.SubdomainPolicy), *tt.expectedSP) + } + } + if tt.expectedNP == nil { + if rec.NonexistentSubdomainPolicy != nil { + t.Errorf("parseDMARCRecord(%q).NonexistentSubdomainPolicy = %v, want nil", tt.record, *rec.NonexistentSubdomainPolicy) + } + } else { + if rec.NonexistentSubdomainPolicy == nil { + t.Fatalf("parseDMARCRecord(%q).NonexistentSubdomainPolicy = nil, want %q", tt.record, *tt.expectedNP) + } + if string(*rec.NonexistentSubdomainPolicy) != *tt.expectedNP { + t.Errorf("NonexistentSubdomainPolicy = %q, want %q", string(*rec.NonexistentSubdomainPolicy), *tt.expectedNP) } } }) } } -func TestExtractDMARCPercentage(t *testing.T) { +func TestParseDMARCRecordPercentage(t *testing.T) { tests := []struct { name string record string expectedPercentage *int }{ - { - name: "Percentage - 100", - record: "v=DMARC1; p=quarantine; pct=100", - expectedPercentage: utils.PtrTo(100), - }, - { - name: "Percentage - 50", - record: "v=DMARC1; p=quarantine; pct=50", - expectedPercentage: utils.PtrTo(50), - }, - { - name: "Percentage - 25", - record: "v=DMARC1; p=reject; pct=25", - expectedPercentage: utils.PtrTo(25), - }, - { - name: "Percentage - 0", - record: "v=DMARC1; p=none; pct=0", - expectedPercentage: utils.PtrTo(0), - }, - { - name: "No percentage specified (defaults to 100)", - record: "v=DMARC1; p=quarantine", - expectedPercentage: nil, - }, - { - name: "Complex record with percentage", - record: "v=DMARC1; p=reject; sp=quarantine; rua=mailto:dmarc@example.com; pct=75", - expectedPercentage: utils.PtrTo(75), - }, - { - name: "Invalid percentage > 100 (ignored)", - record: "v=DMARC1; p=quarantine; pct=150", - expectedPercentage: nil, - }, - { - name: "Invalid percentage < 0 (ignored)", - record: "v=DMARC1; p=quarantine; pct=-10", - expectedPercentage: nil, - }, + {name: "pct=100", record: "v=DMARC1; p=quarantine; pct=100", expectedPercentage: utils.PtrTo(100)}, + {name: "pct=50", record: "v=DMARC1; p=quarantine; pct=50", expectedPercentage: utils.PtrTo(50)}, + {name: "pct=0", record: "v=DMARC1; p=none; pct=0", expectedPercentage: utils.PtrTo(0)}, + {name: "no pct", record: "v=DMARC1; p=quarantine", expectedPercentage: nil}, + {name: "pct=150 ignored", record: "v=DMARC1; p=quarantine; pct=150", expectedPercentage: nil}, } analyzer := NewDNSAnalyzer(5 * time.Second) for _, tt := range tests { t.Run(tt.name, func(t *testing.T) { - result := analyzer.extractDMARCPercentage(tt.record) + result := analyzer.parseDMARCRecord("example.com", tt.record).Percentage if tt.expectedPercentage == nil { if result != nil { - t.Errorf("extractDMARCPercentage(%q) = %v, want nil", tt.record, *result) + t.Errorf("parseDMARCRecord(%q).Percentage = %d, want nil", tt.record, *result) } } else { if result == nil { - t.Fatalf("extractDMARCPercentage(%q) returned nil, expected %d", tt.record, *tt.expectedPercentage) + t.Fatalf("parseDMARCRecord(%q).Percentage = nil, want %d", tt.record, *tt.expectedPercentage) } if *result != *tt.expectedPercentage { - t.Errorf("extractDMARCPercentage(%q) = %d, want %d", tt.record, *result, *tt.expectedPercentage) + t.Errorf("parseDMARCRecord(%q).Percentage = %d, want %d", tt.record, *result, *tt.expectedPercentage) } } }) diff --git a/pkg/analyzer/headers.go b/pkg/analyzer/headers.go index f750742..6d7b547 100644 --- a/pkg/analyzer/headers.go +++ b/pkg/analyzer/headers.go @@ -388,7 +388,7 @@ func (h *HeaderAnalyzer) analyzeDomainAlignment(email *EmailMessage, authResults if domain != "" { alignment.FromDomain = &domain // Extract organizational domain - orgDomain := h.getOrganizationalDomain(domain) + orgDomain := getOrganizationalDomain(domain) alignment.FromOrgDomain = &orgDomain } } @@ -400,7 +400,7 @@ func (h *HeaderAnalyzer) analyzeDomainAlignment(email *EmailMessage, authResults if domain != "" { alignment.ReturnPathDomain = &domain // Extract organizational domain - orgDomain := h.getOrganizationalDomain(domain) + orgDomain := getOrganizationalDomain(domain) alignment.ReturnPathOrgDomain = &orgDomain } } @@ -411,7 +411,7 @@ func (h *HeaderAnalyzer) analyzeDomainAlignment(email *EmailMessage, authResults for _, dkim := range *authResults.Dkim { if dkim.Domain != nil && *dkim.Domain != "" { domain := *dkim.Domain - orgDomain := h.getOrganizationalDomain(domain) + orgDomain := getOrganizationalDomain(domain) dkimDomains = append(dkimDomains, model.DKIMDomainInfo{ Domain: domain, OrgDomain: orgDomain, @@ -542,7 +542,7 @@ func (h *HeaderAnalyzer) extractDomain(emailAddr string) string { // getOrganizationalDomain extracts the organizational domain from a fully qualified domain name // using the Public Suffix List (PSL) to correctly handle multi-level TLDs. // For example: mail.example.com -> example.com, mail.example.co.uk -> example.co.uk -func (h *HeaderAnalyzer) getOrganizationalDomain(domain string) string { +func getOrganizationalDomain(domain string) string { domain = strings.ToLower(strings.TrimSpace(domain)) // Use golang.org/x/net/publicsuffix to get the eTLD+1 (organizational domain) diff --git a/pkg/analyzer/rbl.go b/pkg/analyzer/rbl.go index 7dea559..31cccab 100644 --- a/pkg/analyzer/rbl.go +++ b/pkg/analyzer/rbl.go @@ -318,7 +318,7 @@ func (r *DNSListChecker) CalculateScore(results *DNSListResults, forWhitelist bo return 100, "" } - if results.ListedCount <= 0 { + if results.ListedCount <= 0 || scoringListCount <= 0 { return 100, "A+" } diff --git a/pkg/analyzer/rbl_test.go b/pkg/analyzer/rbl_test.go index 8620038..f86f17b 100644 --- a/pkg/analyzer/rbl_test.go +++ b/pkg/analyzer/rbl_test.go @@ -291,34 +291,38 @@ func TestGetBlacklistScore(t *testing.T) { { name: "Listed on 1 RBL", results: &DNSListResults{ - IPsChecked: []string{"198.51.100.1"}, - ListedCount: 1, + IPsChecked: []string{"198.51.100.1"}, + ListedCount: 1, + RelevantListedCount: 1, }, - expectedScore: 84, // 100 - 1*100/6 = 84 (integer division: 100/6=16) + expectedScore: 92, // 100 - 1*100/12 = 92 (12 scoring lists = 14 default - 2 informational) }, { name: "Listed on 2 RBLs", results: &DNSListResults{ - IPsChecked: []string{"198.51.100.1"}, - ListedCount: 2, + IPsChecked: []string{"198.51.100.1"}, + ListedCount: 2, + RelevantListedCount: 2, }, - expectedScore: 67, // 100 - 2*100/6 = 67 (integer division: 200/6=33) + expectedScore: 84, // 100 - 2*100/12 = 84 }, { name: "Listed on 3 RBLs", results: &DNSListResults{ - IPsChecked: []string{"198.51.100.1"}, - ListedCount: 3, + IPsChecked: []string{"198.51.100.1"}, + ListedCount: 3, + RelevantListedCount: 3, }, - expectedScore: 50, // 100 - 3*100/6 = 50 (integer division: 300/6=50) + expectedScore: 75, // 100 - 3*100/12 = 75 }, { name: "Listed on 4+ RBLs", results: &DNSListResults{ - IPsChecked: []string{"198.51.100.1"}, - ListedCount: 4, + IPsChecked: []string{"198.51.100.1"}, + ListedCount: 4, + RelevantListedCount: 4, }, - expectedScore: 34, // 100 - 4*100/6 = 34 (integer division: 400/6=66) + expectedScore: 67, // 100 - 4*100/12 = 67 }, } @@ -326,7 +330,7 @@ func TestGetBlacklistScore(t *testing.T) { for _, tt := range tests { t.Run(tt.name, func(t *testing.T) { - score, _ := checker.CalculateScore(tt.results) + score, _ := checker.CalculateScore(tt.results, false) if score != tt.expectedScore { t.Errorf("GetBlacklistScore() = %v, want %v", score, tt.expectedScore) } diff --git a/web/package-lock.json b/web/package-lock.json index c37ce8b..27e6fc1 100644 --- a/web/package-lock.json +++ b/web/package-lock.json @@ -31,7 +31,7 @@ "typescript": "^6.0.0", "typescript-eslint": "^8.44.1", 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"@vitest/ui": { @@ -3779,19 +4857,118 @@ }, "jsdom": { "optional": true - }, - "vite": { - "optional": false } } }, - "node_modules/vitest/node_modules/es-module-lexer": { - "version": "2.1.0", - "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-2.1.0.tgz", - "integrity": "sha512-n27zTYMjYu1aj4MjCWzSP7G9r75utsaoc8m61weK+W8JMBGGQybd43GstCXZ3WNmSFtGT9wi59qQTW6mhTR5LQ==", + "node_modules/vitest/node_modules/@vitest/mocker": { + "version": "3.2.4", + "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-3.2.4.tgz", + "integrity": "sha512-46ryTE9RZO/rfDd7pEqFl7etuyzekzEhUbTW3BvmeO/BcCMEgq59BKhek3dXDWgAj4oMK6OZi+vRr1wPW6qjEQ==", + "dev": true, + "license": "MIT", + "dependencies": { + "@vitest/spy": "3.2.4", + "estree-walker": "^3.0.3", + "magic-string": "^0.30.17" + }, + "funding": { + "url": "https://opencollective.com/vitest" + }, + "peerDependencies": { + "msw": "^2.4.9", + "vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0" + }, + "peerDependenciesMeta": { + "msw": { + "optional": true + }, + "vite": { + "optional": true + } + } + }, + "node_modules/vitest/node_modules/tinyexec": { + "version": "0.3.2", + "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-0.3.2.tgz", + "integrity": "sha512-KQQR9yN7R5+OSwaK0XQoj22pwHoTlgYqmUscPYoknOoWCWfj/5/ABTMRi69FrKU5ffPVh5QcFikpWJI/P1ocHA==", "dev": true, "license": "MIT" }, + "node_modules/vitest/node_modules/vite": { + "version": "7.3.3", + "resolved": "https://registry.npmjs.org/vite/-/vite-7.3.3.tgz", + "integrity": "sha512-/4XH147Ui7OGTjg3HbdWe5arnZQSbfuRzdr9Ec7TQi5I7R+ir0Rlc9GIvD4v0XZurELqA035KVXJXpR61xhiTA==", + "dev": true, + "license": "MIT", + "dependencies": { + "esbuild": "^0.27.0", + "fdir": "^6.5.0", + "picomatch": "^4.0.3", + "postcss": "^8.5.6", + "rollup": "^4.43.0", + "tinyglobby": "^0.2.15" + }, + "bin": { + "vite": "bin/vite.js" + }, + "engines": { + "node": "^20.19.0 || >=22.12.0" + }, + "funding": { + "url": "https://github.com/vitejs/vite?sponsor=1" + }, + "optionalDependencies": { + "fsevents": "~2.3.3" + }, + "peerDependencies": { + "@types/node": "^20.19.0 || >=22.12.0", + "jiti": ">=1.21.0", + "less": "^4.0.0", + "lightningcss": "^1.21.0", + "sass": "^1.70.0", + "sass-embedded": "^1.70.0", + "stylus": ">=0.54.8", + "sugarss": "^5.0.0", + "terser": "^5.16.0", + "tsx": "^4.8.1", + "yaml": "^2.4.2" + }, + "peerDependenciesMeta": { + "@types/node": { + "optional": true + }, + "jiti": { + "optional": true + }, + "less": { + "optional": true + }, + "lightningcss": { + "optional": true + }, + "sass": { + "optional": true + }, + "sass-embedded": { + "optional": true + }, + "stylus": { + "optional": true + }, + "sugarss": { + "optional": true + }, + "terser": { + "optional": true + }, + "tsx": { + "optional": true + }, + "yaml": { + "optional": true + } + } + }, "node_modules/which": { "version": "2.0.2", "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz", @@ -3858,6 +5035,22 @@ "url": "https://github.com/sponsors/sindresorhus" } }, + "node_modules/yaml": { + "version": "2.9.0", + "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.9.0.tgz", + "integrity": "sha512-2AvhNX3mb8zd6Zy7INTtSpl1F15HW6Wnqj0srWlkKLcpYl/gMIMJiyuGq2KeI2YFxUPjdlB+3Lc10seMLtL4cA==", + "extraneous": true, + "license": "ISC", + "bin": { + "yaml": "bin.mjs" + }, + "engines": { + "node": ">= 14.6" + }, + "funding": { + "url": "https://github.com/sponsors/eemeli" + } + }, "node_modules/yocto-queue": { "version": "0.1.0", "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz", diff --git a/web/package.json b/web/package.json index 66b2c8c..90b545e 100644 --- a/web/package.json +++ b/web/package.json @@ -34,7 +34,7 @@ "typescript": "^6.0.0", "typescript-eslint": "^8.44.1", "vite": "^8.0.0", - "vitest": "^4.0.0" + "vitest": "^3.2.4" }, "dependencies": { "bootstrap": "^5.3.8", diff --git a/web/src/lib/components/DmarcRecordDisplay.svelte b/web/src/lib/components/DmarcRecordDisplay.svelte index b7a3e7b..e2b83f0 100644 --- a/web/src/lib/components/DmarcRecordDisplay.svelte +++ b/web/src/lib/components/DmarcRecordDisplay.svelte @@ -3,15 +3,31 @@ interface Props { dmarcRecord?: DmarcRecord; + fromDomain?: string; } - let { dmarcRecord }: Props = $props(); + let { dmarcRecord, fromDomain }: Props = $props(); + + const isFallback = $derived( + !!dmarcRecord?.domain && !!fromDomain && dmarcRecord.domain !== fromDomain, + ); + // A single-label domain (no dot) is a TLD/PSD level fallback + const isPsdFallback = $derived(isFallback && !dmarcRecord?.domain?.includes(".")); // Helper function to determine policy strength const policyStrength = (policy: string | undefined): number => { const strength: Record = { none: 0, quarantine: 1, reject: 2 }; return strength[policy || "none"] || 0; }; + + // Effective policy after applying DMARCbis t=y downgrade + const effectivePolicy = $derived((): string => { + const p = dmarcRecord?.policy ?? "none"; + if (!dmarcRecord?.test_mode) return p; + if (p === "reject") return "quarantine"; + if (p === "quarantine") return "none"; + return p; + }); {#if dmarcRecord} @@ -52,6 +68,27 @@ {/if} + + {#if isFallback} +
+ Record found at: + {dmarcRecord.domain} +
+ + No DMARC record exists for {fromDomain}. The record above was + inherited from + {#if isPsdFallback} + the Public Suffix Domain {dmarcRecord.domain} via the DMARCbis + DNS Tree Walk (which obsoletes the RFC 9091 PSD DMARC experiment). + {:else} + the organizational domain {dmarcRecord.domain} via the + DMARCbis DNS Tree Walk (compatible with RFC 7489 organizational domain + fallback). + {/if} +
+
+ {/if} + {#if dmarcRecord.policy}
@@ -99,6 +136,53 @@
{/if} + + {#if dmarcRecord.test_mode} +
+ Test Mode: + t=y (active) +
+ + Test mode active — DMARCbis-compliant receivers will + downgrade the effective policy one level: + {#if dmarcRecord.policy === "reject"} + p=reject is applied as p=quarantine. + {:else if dmarcRecord.policy === "quarantine"} + p=quarantine is applied as p=none (no action taken). + {:else} + p=none is unaffected by test mode. + {/if} + Aggregate reports are still generated normally. + This tag replaces the deprecated pct= for gradual rollout. +
+
+ {/if} + + + {#if dmarcRecord.psd === "y"} +
+ Public Suffix Domain: + psd=y +
+ + PSD declared — this domain is declared as a Public Suffix + Domain. DMARCbis-compliant receivers will apply this policy to subdomains + that have no DMARC record of their own when using the DNS Tree Walk algorithm. +
+
+ {:else if dmarcRecord.psd === "n"} +
+ Organizational Domain Boundary: + psd=n +
+ + Org Domain declared — psd=n explicitly declares + this as an Organizational Domain boundary. Subdomains with separate DNS + delegation will use their own independent DMARCbis Tree Walk. +
+
+ {/if} + {#if dmarcRecord.subdomain_policy} {@const mainStrength = policyStrength(dmarcRecord.policy)} @@ -142,7 +226,43 @@ {/if} - + + {#if dmarcRecord.nonexistent_subdomain_policy} + {@const effectiveSubStrength = policyStrength(dmarcRecord.subdomain_policy ?? dmarcRecord.policy)} + {@const npStrength = policyStrength(dmarcRecord.nonexistent_subdomain_policy)} +
+ Non-Existent Subdomain Policy: + + {dmarcRecord.nonexistent_subdomain_policy} + + {#if npStrength >= effectiveSubStrength} +
+ + Good configuration — non-existent subdomain policy is equal to or stricter + than the effective subdomain policy. +
+ {:else} +
+ + Weaker protection for non-existent subdomains — consider setting + np={dmarcRecord.subdomain_policy ?? dmarcRecord.policy} to match your subdomain policy. +
+ {/if} +
+ + The np= tag is introduced by DMARCbis (draft-ietf-dmarc-dmarcbis), + a draft RFC updating RFC 7489. Support may vary across mail receivers. +
+
+ {/if} + + {#if dmarcRecord.percentage !== undefined}
Enforcement Percentage: @@ -155,25 +275,35 @@ > {dmarcRecord.percentage}% +
+ + Deprecated tag — the pct= tag is removed in + DMARCbis. Many receivers already ignore it. For gradual rollout, replace it + with t=y (test mode); for full enforcement, simply remove + pct= from your record. + {#if dmarcRecord.percentage === 0} +
pct=0 is an anti-pattern — it was widely misused + as a signal to bypass DMARC entirely, which is one reason the tag was + removed. Use t=y instead. + {/if} +
{#if dmarcRecord.percentage === 100}
Full enforcement — all messages are subject to DMARC policy. - This provides maximum protection.
- {:else if dmarcRecord.percentage >= 50} + {:else if dmarcRecord.percentage > 0 && dmarcRecord.percentage >= 50}
Partial enforcement — only {dmarcRecord.percentage}% of - messages are subject to DMARC policy. Consider increasing to - pct=100 once you've validated your configuration. + messages are subject to DMARC policy. Receivers ignoring pct= will apply + the full policy regardless.
- {:else} + {:else if dmarcRecord.percentage > 0}
Low enforcement — only {dmarcRecord.percentage}% of - messages are protected. Gradually increase to pct=100 for full - protection. + messages are protected. Receivers ignoring pct= will apply full policy.
{/if}
@@ -259,6 +389,30 @@ {/if} + + {#if dmarcRecord.deprecated_rf || dmarcRecord.deprecated_ri} +
+ + Deprecated tags detected — your record contains + {#if dmarcRecord.deprecated_rf && dmarcRecord.deprecated_ri} + rf= and ri= tags that are + {:else if dmarcRecord.deprecated_rf} + the rf= tag that is + {:else} + the ri= tag that is + {/if} + removed in DMARCbis. Modern receivers will ignore + {dmarcRecord.deprecated_rf && dmarcRecord.deprecated_ri ? "them" : "it"}. + {#if dmarcRecord.deprecated_ri} + Aggregate reporting interval is now fixed at ≥ 24 hours regardless of + ri=. + {/if} + You can safely remove + {dmarcRecord.deprecated_rf && dmarcRecord.deprecated_ri ? "these tags" : "this tag"} + from your DMARC record. +
+ {/if} + {#if dmarcRecord.error}
diff --git a/web/src/lib/components/DnsRecordsCard.svelte b/web/src/lib/components/DnsRecordsCard.svelte index b7997b0..6dabe0b 100644 --- a/web/src/lib/components/DnsRecordsCard.svelte +++ b/web/src/lib/components/DnsRecordsCard.svelte @@ -165,7 +165,10 @@ {/if} - +