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webadmin: make remaining domain settings configurable via admin web interface

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for dmarc reporting address, tls reporting address, mtasts policy, dkim keys/selectors.

should make it easier for webadmin-using admins to discover these settings.

the webadmin interface is now on par with functionality you would set through
the configuration file, let's keep it that way.
This commit is contained in:
Mechiel Lukkien
2024-04-19 10:23:53 +02:00
parent a69887bfab
commit e702f45d32
11 changed files with 1836 additions and 100 deletions
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289
mox-/admin.go
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@ -10,6 +10,7 @@ import (
"crypto/sha256"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"log/slog"
"net"
@ -29,11 +30,14 @@ import (
"github.com/mjl-/mox/dmarc"
"github.com/mjl-/mox/dns"
"github.com/mjl-/mox/junk"
"github.com/mjl-/mox/mlog"
"github.com/mjl-/mox/mtasts"
"github.com/mjl-/mox/smtp"
"github.com/mjl-/mox/tlsrpt"
)
var ErrRequest = errors.New("bad request")
// TXTStrings returns a TXT record value as one or more quoted strings, each max
// 100 characters. In case of multiple strings, a multi-line record is returned.
func TXTStrings(s string) string {
@ -151,6 +155,31 @@ func MakeAccountConfig(addr smtp.Address) config.Account {
return account
}
func writeFile(log mlog.Log, path string, data []byte) error {
os.MkdirAll(filepath.Dir(path), 0770)
f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0660)
if err != nil {
return fmt.Errorf("creating file %s: %s", path, err)
}
defer func() {
if f != nil {
err := f.Close()
log.Check(err, "closing file after error")
err = os.Remove(path)
log.Check(err, "removing file after error", slog.String("path", path))
}
}()
if _, err := f.Write(data); err != nil {
return fmt.Errorf("writing file %s: %s", path, err)
}
if err := f.Close(); err != nil {
return fmt.Errorf("close file: %v", err)
}
f = nil
return nil
}
// MakeDomainConfig makes a new config for a domain, creating DKIM keys, using
// accountName for DMARC and TLS reports.
func MakeDomainConfig(ctx context.Context, domain, hostname dns.Domain, accountName string, withMTASTS bool) (config.Domain, []string, error) {
@ -168,31 +197,6 @@ func MakeDomainConfig(ctx context.Context, domain, hostname dns.Domain, accountN
}
}()
writeFile := func(path string, data []byte) error {
os.MkdirAll(filepath.Dir(path), 0770)
f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0660)
if err != nil {
return fmt.Errorf("creating file %s: %s", path, err)
}
defer func() {
if f != nil {
err := f.Close()
log.Check(err, "closing file after error")
err = os.Remove(path)
log.Check(err, "removing file after error", slog.String("path", path))
}
}()
if _, err := f.Write(data); err != nil {
return fmt.Errorf("writing file %s: %s", path, err)
}
if err := f.Close(); err != nil {
return fmt.Errorf("close file: %v", err)
}
f = nil
return nil
}
confDKIM := config.DKIM{
Selectors: map[string]config.Selector{},
}
@ -201,7 +205,7 @@ func MakeDomainConfig(ctx context.Context, domain, hostname dns.Domain, accountN
record := fmt.Sprintf("%s._domainkey.%s", name, domain.ASCII)
keyPath := filepath.Join("dkim", fmt.Sprintf("%s.%s.%s.privatekey.pkcs8.pem", record, timestamp, kind))
p := configDirPath(ConfigDynamicPath, keyPath)
if err := writeFile(p, privKey); err != nil {
if err := writeFile(log, p, privKey); err != nil {
return err
}
paths = append(paths, p)
@ -282,6 +286,164 @@ func MakeDomainConfig(ctx context.Context, domain, hostname dns.Domain, accountN
return confDomain, rpaths, nil
}
// DKIMAdd adds a DKIM selector for a domain, generating a key and writing it to disk.
func DKIMAdd(ctx context.Context, domain, selector dns.Domain, algorithm, hash string, headerRelaxed, bodyRelaxed, seal bool, headers []string, lifetime time.Duration) (rerr error) {
log := pkglog.WithContext(ctx)
defer func() {
if rerr != nil {
log.Errorx("adding dkim key", rerr,
slog.Any("domain", domain),
slog.Any("selector", selector))
}
}()
switch hash {
case "sha256", "sha1":
default:
return fmt.Errorf("%w: unknown hash algorithm %q", ErrRequest, hash)
}
var privKey []byte
var err error
var kind string
switch algorithm {
case "rsa":
privKey, err = MakeDKIMRSAKey(selector, domain)
kind = "rsa2048"
case "ed25519":
privKey, err = MakeDKIMEd25519Key(selector, domain)
kind = "ed25519"
default:
err = fmt.Errorf("unknown algorithm")
}
if err != nil {
return fmt.Errorf("%w: making dkim key: %v", ErrRequest, err)
}
// Only take lock now, we don't want to hold it while generating a key.
Conf.dynamicMutex.Lock()
defer Conf.dynamicMutex.Unlock()
c := Conf.Dynamic
d, ok := c.Domains[domain.Name()]
if !ok {
return fmt.Errorf("%w: domain does not exist", ErrRequest)
}
if _, ok := d.DKIM.Selectors[selector.Name()]; ok {
return fmt.Errorf("%w: selector already exists for domain", ErrRequest)
}
record := fmt.Sprintf("%s._domainkey.%s", selector.ASCII, domain.ASCII)
timestamp := time.Now().Format("20060102T150405")
keyPath := filepath.Join("dkim", fmt.Sprintf("%s.%s.%s.privatekey.pkcs8.pem", record, timestamp, kind))
p := configDirPath(ConfigDynamicPath, keyPath)
if err := writeFile(log, p, privKey); err != nil {
return fmt.Errorf("writing key file: %v", err)
}
removePath := p
defer func() {
if removePath != "" {
err := os.Remove(removePath)
log.Check(err, "removing path for dkim key", slog.String("path", removePath))
}
}()
nsel := config.Selector{
Hash: hash,
Canonicalization: config.Canonicalization{
HeaderRelaxed: headerRelaxed,
BodyRelaxed: bodyRelaxed,
},
Headers: headers,
DontSealHeaders: !seal,
Expiration: lifetime.String(),
PrivateKeyFile: keyPath,
}
// All good, time to update the config.
nd := d
nd.DKIM.Selectors = map[string]config.Selector{}
for name, osel := range d.DKIM.Selectors {
nd.DKIM.Selectors[name] = osel
}
nd.DKIM.Selectors[selector.Name()] = nsel
nc := c
nc.Domains = map[string]config.Domain{}
for name, dom := range c.Domains {
nc.Domains[name] = dom
}
nc.Domains[domain.Name()] = nd
if err := writeDynamic(ctx, log, nc); err != nil {
return fmt.Errorf("writing domains.conf: %w", err)
}
log.Info("dkim key added", slog.Any("domain", domain), slog.Any("selector", selector))
removePath = "" // Prevent cleanup of key file.
return nil
}
// DKIMRemove removes the selector from the domain, moving the key file out of the way.
func DKIMRemove(ctx context.Context, domain, selector dns.Domain) (rerr error) {
log := pkglog.WithContext(ctx)
defer func() {
if rerr != nil {
log.Errorx("removing dkim key", rerr,
slog.Any("domain", domain),
slog.Any("selector", selector))
}
}()
Conf.dynamicMutex.Lock()
defer Conf.dynamicMutex.Unlock()
c := Conf.Dynamic
d, ok := c.Domains[domain.Name()]
if !ok {
return fmt.Errorf("%w: domain does not exist", ErrRequest)
}
sel, ok := d.DKIM.Selectors[selector.Name()]
if !ok {
return fmt.Errorf("%w: selector does not exist for domain", ErrRequest)
}
nsels := map[string]config.Selector{}
for name, sel := range d.DKIM.Selectors {
if name != selector.Name() {
nsels[name] = sel
}
}
nsign := make([]string, 0, len(d.DKIM.Sign))
for _, name := range d.DKIM.Sign {
if name != selector.Name() {
nsign = append(nsign, name)
}
}
nd := d
nd.DKIM = config.DKIM{Selectors: nsels, Sign: nsign}
nc := c
nc.Domains = map[string]config.Domain{}
for name, dom := range c.Domains {
nc.Domains[name] = dom
}
nc.Domains[domain.Name()] = nd
if err := writeDynamic(ctx, log, nc); err != nil {
return fmt.Errorf("writing domains.conf: %w", err)
}
// Move away a DKIM private key to a subdirectory "old". But only if
// not in use by other domains.
usedKeyPaths := gatherUsedKeysPaths(nc)
moveAwayKeys(log, map[string]config.Selector{selector.Name(): sel}, usedKeyPaths)
log.Info("dkim key removed", slog.Any("domain", domain), slog.Any("selector", selector))
return nil
}
// DomainAdd adds the domain to the domains config, rewriting domains.conf and
// marking it loaded.
//
@ -304,7 +466,7 @@ func DomainAdd(ctx context.Context, domain dns.Domain, accountName string, local
c := Conf.Dynamic
if _, ok := c.Domains[domain.Name()]; ok {
return fmt.Errorf("domain already present")
return fmt.Errorf("%w: domain already present", ErrRequest)
}
// Compose new config without modifying existing data structures. If we fail, we
@ -336,11 +498,11 @@ func DomainAdd(ctx context.Context, domain dns.Domain, accountName string, local
}()
if _, ok := c.Accounts[accountName]; ok && localpart != "" {
return fmt.Errorf("account already exists (leave localpart empty when using an existing account)")
return fmt.Errorf("%w: account already exists (leave localpart empty when using an existing account)", ErrRequest)
} else if !ok && localpart == "" {
return fmt.Errorf("account does not yet exist (specify a localpart)")
return fmt.Errorf("%w: account does not yet exist (specify a localpart)", ErrRequest)
} else if accountName == "" {
return fmt.Errorf("account name is empty")
return fmt.Errorf("%w: account name is empty", ErrRequest)
} else if !ok {
nc.Accounts[accountName] = MakeAccountConfig(smtp.Address{Localpart: localpart, Domain: domain})
} else if accountName != Conf.Static.Postmaster.Account {
@ -358,7 +520,7 @@ func DomainAdd(ctx context.Context, domain dns.Domain, accountName string, local
nc.Domains[domain.Name()] = confDomain
if err := writeDynamic(ctx, log, nc); err != nil {
return fmt.Errorf("writing domains.conf: %v", err)
return fmt.Errorf("writing domains.conf: %w", err)
}
log.Info("domain added", slog.Any("domain", domain))
cleanupFiles = nil // All good, don't cleanup.
@ -382,7 +544,7 @@ func DomainRemove(ctx context.Context, domain dns.Domain) (rerr error) {
c := Conf.Dynamic
domConf, ok := c.Domains[domain.Name()]
if !ok {
return fmt.Errorf("domain does not exist")
return fmt.Errorf("%w: domain does not exist", ErrRequest)
}
// Compose new config without modifying existing data structures. If we fail, we
@ -397,18 +559,30 @@ func DomainRemove(ctx context.Context, domain dns.Domain) (rerr error) {
}
if err := writeDynamic(ctx, log, nc); err != nil {
return fmt.Errorf("writing domains.conf: %v", err)
return fmt.Errorf("writing domains.conf: %w", err)
}
// Move away any DKIM private keys to a subdirectory "old". But only if
// they are not in use by other domains.
usedKeyPaths := gatherUsedKeysPaths(nc)
moveAwayKeys(log, domConf.DKIM.Selectors, usedKeyPaths)
log.Info("domain removed", slog.Any("domain", domain))
return nil
}
func gatherUsedKeysPaths(nc config.Dynamic) map[string]bool {
usedKeyPaths := map[string]bool{}
for _, dc := range nc.Domains {
for _, sel := range dc.DKIM.Selectors {
usedKeyPaths[filepath.Clean(sel.PrivateKeyFile)] = true
}
}
for _, sel := range domConf.DKIM.Selectors {
return usedKeyPaths
}
func moveAwayKeys(log mlog.Log, sels map[string]config.Selector, usedKeyPaths map[string]bool) {
for _, sel := range sels {
if sel.PrivateKeyFile == "" || usedKeyPaths[filepath.Clean(sel.PrivateKeyFile)] {
continue
}
@ -425,9 +599,6 @@ func DomainRemove(ctx context.Context, domain dns.Domain) (rerr error) {
log.Errorx("renaming dkim private key file for removed domain", err, slog.String("src", src), slog.String("dst", dst))
}
}
log.Info("domain removed", slog.Any("domain", domain))
return nil
}
// DomainSave calls xmodify with a shallow copy of the domain config. xmodify
@ -448,7 +619,7 @@ func DomainSave(ctx context.Context, domainName string, xmodify func(config *con
nc := Conf.Dynamic // Shallow copy.
dom, ok := nc.Domains[domainName] // dom is a shallow copy.
if !ok {
return fmt.Errorf("domain not present")
return fmt.Errorf("%w: domain not present", ErrRequest)
}
xmodify(&dom)
@ -789,7 +960,7 @@ func AccountAdd(ctx context.Context, account, address string) (rerr error) {
addr, err := smtp.ParseAddress(address)
if err != nil {
return fmt.Errorf("parsing email address: %v", err)
return fmt.Errorf("%w: parsing email address: %v", ErrRequest, err)
}
Conf.dynamicMutex.Lock()
@ -797,11 +968,11 @@ func AccountAdd(ctx context.Context, account, address string) (rerr error) {
c := Conf.Dynamic
if _, ok := c.Accounts[account]; ok {
return fmt.Errorf("account already present")
return fmt.Errorf("%w: account already present", ErrRequest)
}
if err := checkAddressAvailable(addr); err != nil {
return fmt.Errorf("address not available: %v", err)
return fmt.Errorf("%w: address not available: %v", ErrRequest, err)
}
// Compose new config without modifying existing data structures. If we fail, we
@ -834,7 +1005,7 @@ func AccountRemove(ctx context.Context, account string) (rerr error) {
c := Conf.Dynamic
if _, ok := c.Accounts[account]; !ok {
return fmt.Errorf("account does not exist")
return fmt.Errorf("%w: account does not exist", ErrRequest)
}
// Compose new config without modifying existing data structures. If we fail, we
@ -888,30 +1059,30 @@ func AddressAdd(ctx context.Context, address, account string) (rerr error) {
c := Conf.Dynamic
a, ok := c.Accounts[account]
if !ok {
return fmt.Errorf("account does not exist")
return fmt.Errorf("%w: account does not exist", ErrRequest)
}
var destAddr string
if strings.HasPrefix(address, "@") {
d, err := dns.ParseDomain(address[1:])
if err != nil {
return fmt.Errorf("parsing domain: %v", err)
return fmt.Errorf("%w: parsing domain: %v", ErrRequest, err)
}
dname := d.Name()
destAddr = "@" + dname
if _, ok := Conf.Dynamic.Domains[dname]; !ok {
return fmt.Errorf("domain does not exist")
return fmt.Errorf("%w: domain does not exist", ErrRequest)
} else if _, ok := Conf.accountDestinations[destAddr]; ok {
return fmt.Errorf("catchall address already configured for domain")
return fmt.Errorf("%w: catchall address already configured for domain", ErrRequest)
}
} else {
addr, err := smtp.ParseAddress(address)
if err != nil {
return fmt.Errorf("parsing email address: %v", err)
return fmt.Errorf("%w: parsing email address: %v", ErrRequest, err)
}
if err := checkAddressAvailable(addr); err != nil {
return fmt.Errorf("address not available: %v", err)
return fmt.Errorf("%w: address not available: %v", ErrRequest, err)
}
destAddr = addr.String()
}
@ -953,7 +1124,7 @@ func AddressRemove(ctx context.Context, address string) (rerr error) {
ad, ok := Conf.accountDestinations[address]
if !ok {
return fmt.Errorf("address does not exists")
return fmt.Errorf("%w: address does not exists", ErrRequest)
}
// Compose new config without modifying existing data structures. If we fail, we
@ -973,7 +1144,7 @@ func AddressRemove(ctx context.Context, address string) (rerr error) {
}
}
if !dropped {
return fmt.Errorf("address not removed, likely a postmaster/reporting address")
return fmt.Errorf("%w: address not removed, likely a postmaster/reporting address", ErrRequest)
}
// Also remove matching address from FromIDLoginAddresses, composing a new slice.
@ -984,12 +1155,12 @@ func AddressRemove(ctx context.Context, address string) (rerr error) {
if strings.HasPrefix(address, "@") {
dom, err = dns.ParseDomain(address[1:])
if err != nil {
return fmt.Errorf("parsing domain for catchall address: %v", err)
return fmt.Errorf("%w: parsing domain for catchall address: %v", ErrRequest, err)
}
} else {
pa, err = smtp.ParseAddress(address)
if err != nil {
return fmt.Errorf("parsing address: %v", err)
return fmt.Errorf("%w: parsing address: %v", ErrRequest, err)
}
dom = pa.Domain
}
@ -1004,15 +1175,15 @@ func AddressRemove(ctx context.Context, address string) (rerr error) {
}
dc, ok := Conf.Dynamic.Domains[dom.Name()]
if !ok {
return fmt.Errorf("unknown domain in fromid login address %q", fa.Pack(true))
return fmt.Errorf("%w: unknown domain in fromid login address %q", ErrRequest, fa.Pack(true))
}
flp, err := CanonicalLocalpart(fa.Localpart, dc)
if err != nil {
return fmt.Errorf("getting canonical localpart for fromid login address %q: %v", fa.Localpart, err)
return fmt.Errorf("%w: getting canonical localpart for fromid login address %q: %v", ErrRequest, fa.Localpart, err)
}
alp, err := CanonicalLocalpart(pa.Localpart, dc)
if err != nil {
return fmt.Errorf("getting canonical part for address: %v", err)
return fmt.Errorf("%w: getting canonical part for address: %v", ErrRequest, err)
}
if alp != flp {
// Keep for different localpart.
@ -1054,7 +1225,7 @@ func AccountSave(ctx context.Context, account string, xmodify func(acc *config.A
c := Conf.Dynamic
acc, ok := c.Accounts[account]
if !ok {
return fmt.Errorf("account not present")
return fmt.Errorf("%w: account not present", ErrRequest)
}
xmodify(&acc)
@ -1101,7 +1272,7 @@ func ClientConfigDomain(d dns.Domain) (rconfig ClientConfig, rerr error) {
domConf, ok := Conf.Domain(d)
if !ok {
return ClientConfig{}, fmt.Errorf("unknown domain")
return ClientConfig{}, fmt.Errorf("%w: unknown domain", ErrRequest)
}
gather := func(l config.Listener) (done bool) {
@ -1159,7 +1330,7 @@ func ClientConfigDomain(d dns.Domain) (rconfig ClientConfig, rerr error) {
return
}
}
return ClientConfig{}, fmt.Errorf("no listeners found for imap and/or submission")
return ClientConfig{}, fmt.Errorf("%w: no listeners found for imap and/or submission", ErrRequest)
}
// ClientConfigs holds the client configuration for IMAP/Submission for a
@ -1181,7 +1352,7 @@ type ClientConfigsEntry struct {
func ClientConfigsDomain(d dns.Domain) (ClientConfigs, error) {
domConf, ok := Conf.Domain(d)
if !ok {
return ClientConfigs{}, fmt.Errorf("unknown domain")
return ClientConfigs{}, fmt.Errorf("%w: unknown domain", ErrRequest)
}
c := ClientConfigs{}