mirror of
https://github.com/hanzoai/mail.git
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zeekayandHanzo Dev
15909c7b79
Fork of github.com/mjl-/mox at 5656ca6d1b
(upstream v0.0.15 plus 55 commits).
Rename the module path in go.mod and the import paths in 268 Go files. Also
update the five scripts that "go install" the module (genwebsite.sh,
docker-release.sh, apidiff.sh, test-upgrade.sh, Dockerfile.release), which
would otherwise build upstream rather than this fork.
Add NOTICE recording the upstream project, author, license, and fork point,
and stating which license covers which files: MIT for the mox source and our
changes, MPL-2.0 for publicsuffix/public_suffix_list.txt alone, and the
vendored dependencies' own licenses under licenses/. Embed NOTICE so
"mail licenses" prints the lineage from the running binary. LICENSE.MIT,
LICENSE.MPLv2.0 and the licenses/ tree are preserved verbatim; no code is
relicensed.
The mox command name, config keys, data directory layout and website content
are unchanged. LLM.md records the fork point, the rename, what was left alone,
and the steps to stand the server up.
Co-authored-by: Hanzo Dev <[email protected]>
85 lines
2.3 KiB
Go
85 lines
2.3 KiB
Go
package tlsrpt
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import (
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"context"
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"errors"
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"fmt"
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"log/slog"
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"time"
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"github.com/hanzoai/mail/dns"
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"github.com/hanzoai/mail/mlog"
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"github.com/hanzoai/mail/stub"
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)
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var (
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MetricLookup stub.HistogramVec = stub.HistogramVecIgnore{}
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)
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var (
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ErrNoRecord = errors.New("tlsrpt: no tlsrpt dns txt record")
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ErrMultipleRecords = errors.New("tlsrpt: multiple tlsrpt records") // Must be treated as if domain does not implement TLSRPT.
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ErrDNS = errors.New("tlsrpt: temporary error")
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ErrRecordSyntax = errors.New("tlsrpt: record syntax error")
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)
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// Lookup looks up a TLSRPT DNS TXT record for domain at "_smtp._tls.<domain>" and
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// parses it.
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func Lookup(ctx context.Context, elog *slog.Logger, resolver dns.Resolver, domain dns.Domain) (rrecord *Record, rtxt string, rerr error) {
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log := mlog.New("tlsrpt", elog)
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start := time.Now()
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defer func() {
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result := "ok"
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if rerr != nil {
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if errors.Is(rerr, ErrNoRecord) {
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result = "notfound"
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} else if errors.Is(rerr, ErrMultipleRecords) {
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result = "multiple"
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} else if errors.Is(rerr, ErrDNS) {
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result = "temperror"
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} else if errors.Is(rerr, ErrRecordSyntax) {
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result = "malformed"
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} else {
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result = "error"
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}
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}
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MetricLookup.ObserveLabels(float64(time.Since(start))/float64(time.Second), result)
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log.Debugx("tlsrpt lookup result", rerr,
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slog.Any("domain", domain),
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slog.Any("record", rrecord),
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slog.Duration("duration", time.Since(start)))
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}()
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name := "_smtp._tls." + domain.ASCII + "."
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txts, _, err := dns.WithPackage(resolver, "tlsrpt").LookupTXT(ctx, name)
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if dns.IsNotFound(err) {
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return nil, "", ErrNoRecord
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} else if err != nil {
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return nil, "", fmt.Errorf("%w: %s", ErrDNS, err)
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}
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var text string
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var record *Record
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for _, txt := range txts {
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r, istlsrpt, err := ParseRecord(txt)
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if !istlsrpt {
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// This is a loose but probably reasonable interpretation of ../rfc/8460:375 which
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// wants us to discard otherwise valid records that start with e.g. "v=TLSRPTv1 ;"
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// (note the space before the ";") when multiple TXT records were returned.
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continue
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}
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if err != nil {
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return nil, "", fmt.Errorf("parsing record: %w", err)
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}
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if record != nil {
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return nil, "", ErrMultipleRecords
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}
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record = r
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text = txt
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}
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if record == nil {
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return nil, "", ErrNoRecord
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}
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return record, text, nil
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}
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