aboutsummaryrefslogtreecommitdiff
path: root/core/https/setup.go
diff options
context:
space:
mode:
Diffstat (limited to 'core/https/setup.go')
-rw-r--r--core/https/setup.go321
1 files changed, 0 insertions, 321 deletions
diff --git a/core/https/setup.go b/core/https/setup.go
deleted file mode 100644
index ec90e0284..000000000
--- a/core/https/setup.go
+++ /dev/null
@@ -1,321 +0,0 @@
-package https
-
-import (
- "bytes"
- "crypto/tls"
- "encoding/pem"
- "io/ioutil"
- "log"
- "os"
- "path/filepath"
- "strconv"
- "strings"
-
- "github.com/miekg/coredns/core/setup"
- "github.com/miekg/coredns/middleware"
- "github.com/miekg/coredns/server"
-)
-
-// Setup sets up the TLS configuration and installs certificates that
-// are specified by the user in the config file. All the automatic HTTPS
-// stuff comes later outside of this function.
-func Setup(c *setup.Controller) (middleware.Middleware, error) {
- if c.Port == "80" {
- c.TLS.Enabled = false
- log.Printf("[WARNING] TLS disabled for %s.", c.Address())
- return nil, nil
- }
- c.TLS.Enabled = true
-
- // TODO(miek): disabled for now
- return nil, nil
-
- for c.Next() {
- var certificateFile, keyFile, loadDir, maxCerts string
-
- args := c.RemainingArgs()
- switch len(args) {
- case 1:
- c.TLS.LetsEncryptEmail = args[0]
-
- // user can force-disable managed TLS this way
- if c.TLS.LetsEncryptEmail == "off" {
- c.TLS.Enabled = false
- return nil, nil
- }
- case 2:
- certificateFile = args[0]
- keyFile = args[1]
- c.TLS.Manual = true
- }
-
- // Optional block with extra parameters
- var hadBlock bool
- for c.NextBlock() {
- hadBlock = true
- switch c.Val() {
- case "protocols":
- args := c.RemainingArgs()
- if len(args) != 2 {
- return nil, c.ArgErr()
- }
- value, ok := supportedProtocols[strings.ToLower(args[0])]
- if !ok {
- return nil, c.Errf("Wrong protocol name or protocol not supported '%s'", c.Val())
- }
- c.TLS.ProtocolMinVersion = value
- value, ok = supportedProtocols[strings.ToLower(args[1])]
- if !ok {
- return nil, c.Errf("Wrong protocol name or protocol not supported '%s'", c.Val())
- }
- c.TLS.ProtocolMaxVersion = value
- case "ciphers":
- for c.NextArg() {
- value, ok := supportedCiphersMap[strings.ToUpper(c.Val())]
- if !ok {
- return nil, c.Errf("Wrong cipher name or cipher not supported '%s'", c.Val())
- }
- c.TLS.Ciphers = append(c.TLS.Ciphers, value)
- }
- case "clients":
- c.TLS.ClientCerts = c.RemainingArgs()
- if len(c.TLS.ClientCerts) == 0 {
- return nil, c.ArgErr()
- }
- case "load":
- c.Args(&loadDir)
- c.TLS.Manual = true
- case "max_certs":
- c.Args(&maxCerts)
- c.TLS.OnDemand = true
- default:
- return nil, c.Errf("Unknown keyword '%s'", c.Val())
- }
- }
-
- // tls requires at least one argument if a block is not opened
- if len(args) == 0 && !hadBlock {
- return nil, c.ArgErr()
- }
-
- // set certificate limit if on-demand TLS is enabled
- if maxCerts != "" {
- maxCertsNum, err := strconv.Atoi(maxCerts)
- if err != nil || maxCertsNum < 1 {
- return nil, c.Err("max_certs must be a positive integer")
- }
- if onDemandMaxIssue == 0 || int32(maxCertsNum) < onDemandMaxIssue { // keep the minimum; TODO: We have to do this because it is global; should be per-server or per-vhost...
- onDemandMaxIssue = int32(maxCertsNum)
- }
- }
-
- // don't try to load certificates unless we're supposed to
- if !c.TLS.Enabled || !c.TLS.Manual {
- continue
- }
-
- // load a single certificate and key, if specified
- if certificateFile != "" && keyFile != "" {
- err := cacheUnmanagedCertificatePEMFile(certificateFile, keyFile)
- if err != nil {
- return nil, c.Errf("Unable to load certificate and key files for %s: %v", c.Host, err)
- }
- log.Printf("[INFO] Successfully loaded TLS assets from %s and %s", certificateFile, keyFile)
- }
-
- // load a directory of certificates, if specified
- if loadDir != "" {
- err := loadCertsInDir(c, loadDir)
- if err != nil {
- return nil, err
- }
- }
- }
-
- setDefaultTLSParams(c.Config)
-
- return nil, nil
-}
-
-// loadCertsInDir loads all the certificates/keys in dir, as long as
-// the file ends with .pem. This method of loading certificates is
-// modeled after haproxy, which expects the certificate and key to
-// be bundled into the same file:
-// https://cbonte.github.io/haproxy-dconv/configuration-1.5.html#5.1-crt
-//
-// This function may write to the log as it walks the directory tree.
-func loadCertsInDir(c *setup.Controller, dir string) error {
- return filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
- if err != nil {
- log.Printf("[WARNING] Unable to traverse into %s; skipping", path)
- return nil
- }
- if info.IsDir() {
- return nil
- }
- if strings.HasSuffix(strings.ToLower(info.Name()), ".pem") {
- certBuilder, keyBuilder := new(bytes.Buffer), new(bytes.Buffer)
- var foundKey bool // use only the first key in the file
-
- bundle, err := ioutil.ReadFile(path)
- if err != nil {
- return err
- }
-
- for {
- // Decode next block so we can see what type it is
- var derBlock *pem.Block
- derBlock, bundle = pem.Decode(bundle)
- if derBlock == nil {
- break
- }
-
- if derBlock.Type == "CERTIFICATE" {
- // Re-encode certificate as PEM, appending to certificate chain
- pem.Encode(certBuilder, derBlock)
- } else if derBlock.Type == "EC PARAMETERS" {
- // EC keys generated from openssl can be composed of two blocks:
- // parameters and key (parameter block should come first)
- if !foundKey {
- // Encode parameters
- pem.Encode(keyBuilder, derBlock)
-
- // Key must immediately follow
- derBlock, bundle = pem.Decode(bundle)
- if derBlock == nil || derBlock.Type != "EC PRIVATE KEY" {
- return c.Errf("%s: expected elliptic private key to immediately follow EC parameters", path)
- }
- pem.Encode(keyBuilder, derBlock)
- foundKey = true
- }
- } else if derBlock.Type == "PRIVATE KEY" || strings.HasSuffix(derBlock.Type, " PRIVATE KEY") {
- // RSA key
- if !foundKey {
- pem.Encode(keyBuilder, derBlock)
- foundKey = true
- }
- } else {
- return c.Errf("%s: unrecognized PEM block type: %s", path, derBlock.Type)
- }
- }
-
- certPEMBytes, keyPEMBytes := certBuilder.Bytes(), keyBuilder.Bytes()
- if len(certPEMBytes) == 0 {
- return c.Errf("%s: failed to parse PEM data", path)
- }
- if len(keyPEMBytes) == 0 {
- return c.Errf("%s: no private key block found", path)
- }
-
- err = cacheUnmanagedCertificatePEMBytes(certPEMBytes, keyPEMBytes)
- if err != nil {
- return c.Errf("%s: failed to load cert and key for %s: %v", path, c.Host, err)
- }
- log.Printf("[INFO] Successfully loaded TLS assets from %s", path)
- }
- return nil
- })
-}
-
-// setDefaultTLSParams sets the default TLS cipher suites, protocol versions,
-// and server preferences of a server.Config if they were not previously set
-// (it does not overwrite; only fills in missing values). It will also set the
-// port to 443 if not already set, TLS is enabled, TLS is manual, and the host
-// does not equal localhost.
-func setDefaultTLSParams(c *server.Config) {
- // If no ciphers provided, use default list
- if len(c.TLS.Ciphers) == 0 {
- c.TLS.Ciphers = defaultCiphers
- }
-
- // Not a cipher suite, but still important for mitigating protocol downgrade attacks
- // (prepend since having it at end breaks http2 due to non-h2-approved suites before it)
- c.TLS.Ciphers = append([]uint16{tls.TLS_FALLBACK_SCSV}, c.TLS.Ciphers...)
-
- // Set default protocol min and max versions - must balance compatibility and security
- if c.TLS.ProtocolMinVersion == 0 {
- c.TLS.ProtocolMinVersion = tls.VersionTLS10
- }
- if c.TLS.ProtocolMaxVersion == 0 {
- c.TLS.ProtocolMaxVersion = tls.VersionTLS12
- }
-
- // Prefer server cipher suites
- c.TLS.PreferServerCipherSuites = true
-
- // Default TLS port is 443; only use if port is not manually specified,
- // TLS is enabled, and the host is not localhost
- if c.Port == "" && c.TLS.Enabled && (!c.TLS.Manual || c.TLS.OnDemand) && c.Host != "localhost" {
- c.Port = "443"
- }
-}
-
-// Map of supported protocols.
-// SSLv3 will be not supported in future release.
-// HTTP/2 only supports TLS 1.2 and higher.
-var supportedProtocols = map[string]uint16{
- "ssl3.0": tls.VersionSSL30,
- "tls1.0": tls.VersionTLS10,
- "tls1.1": tls.VersionTLS11,
- "tls1.2": tls.VersionTLS12,
-}
-
-// Map of supported ciphers, used only for parsing config.
-//
-// Note that, at time of writing, HTTP/2 blacklists 276 cipher suites,
-// including all but two of the suites below (the two GCM suites).
-// See https://http2.github.io/http2-spec/#BadCipherSuites
-//
-// TLS_FALLBACK_SCSV is not in this list because we manually ensure
-// it is always added (even though it is not technically a cipher suite).
-//
-// This map, like any map, is NOT ORDERED. Do not range over this map.
-var supportedCiphersMap = map[string]uint16{
- "ECDHE-RSA-AES256-GCM-SHA384": tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
- "ECDHE-ECDSA-AES256-GCM-SHA384": tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
- "ECDHE-RSA-AES128-GCM-SHA256": tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
- "ECDHE-ECDSA-AES128-GCM-SHA256": tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
- "ECDHE-RSA-AES128-CBC-SHA": tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
- "ECDHE-RSA-AES256-CBC-SHA": tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
- "ECDHE-ECDSA-AES256-CBC-SHA": tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
- "ECDHE-ECDSA-AES128-CBC-SHA": tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
- "RSA-AES128-CBC-SHA": tls.TLS_RSA_WITH_AES_128_CBC_SHA,
- "RSA-AES256-CBC-SHA": tls.TLS_RSA_WITH_AES_256_CBC_SHA,
- "ECDHE-RSA-3DES-EDE-CBC-SHA": tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
- "RSA-3DES-EDE-CBC-SHA": tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
-}
-
-// List of supported cipher suites in descending order of preference.
-// Ordering is very important! Getting the wrong order will break
-// mainstream clients, especially with HTTP/2.
-//
-// Note that TLS_FALLBACK_SCSV is not in this list since it is always
-// added manually.
-var supportedCiphers = []uint16{
- tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
- tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
- tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
- tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
- tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
- tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
- tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
- tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
- tls.TLS_RSA_WITH_AES_256_CBC_SHA,
- tls.TLS_RSA_WITH_AES_128_CBC_SHA,
- tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
- tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
-}
-
-// List of all the ciphers we want to use by default
-var defaultCiphers = []uint16{
- tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
- tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
- tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
- tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
- tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
- tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
- tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
- tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
- tls.TLS_RSA_WITH_AES_256_CBC_SHA,
- tls.TLS_RSA_WITH_AES_128_CBC_SHA,
-}
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-30 03:42:48 +0000