cmd/derper: add setec secret support (#14890)

Add setec secret support for derper.
Support dev mode via env var, and setec via secrets URL.

For backwards compatibility use setec load from file also.

Updates tailscale/corp#25756

Signed-off-by: Mike O'Driscoll <mikeo@tailscale.com>

cmd/derper/depaware.txt

@@ -51,6 +51,8 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
    W    github.com/tailscale/go-winio/pkg/guid                       from github.com/tailscale/go-winio+
    L 💣 github.com/tailscale/netlink                                 from tailscale.com/util/linuxfw
    L 💣 github.com/tailscale/netlink/nl                              from github.com/tailscale/netlink
+        github.com/tailscale/setec/client/setec                      from tailscale.com/cmd/derper
+        github.com/tailscale/setec/types/api                         from github.com/tailscale/setec/client/setec
    L    github.com/vishvananda/netns                                 from github.com/tailscale/netlink+
         github.com/x448/float16                                      from github.com/fxamacker/cbor/v2
      💣 go4.org/mem                                                  from tailscale.com/client/tailscale+
@@ -207,6 +209,7 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         golang.org/x/net/proxy                                       from tailscale.com/net/netns
    D    golang.org/x/net/route                                       from net+
         golang.org/x/sync/errgroup                                   from github.com/mdlayher/socket+
+        golang.org/x/sync/singleflight                               from github.com/tailscale/setec/client/setec
         golang.org/x/sys/cpu                                         from golang.org/x/crypto/argon2+
   LD    golang.org/x/sys/unix                                        from github.com/google/nftables+
    W    golang.org/x/sys/windows                                     from github.com/dblohm7/wingoes+

cmd/derper/derper.go

@@ -27,6 +27,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"path"
 	"path/filepath"
 	"regexp"
 	"runtime"
@@ -36,6 +37,7 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/tailscale/setec/client/setec"
 	"golang.org/x/time/rate"
 	"tailscale.com/atomicfile"
 	"tailscale.com/derp"
@@ -64,6 +66,9 @@ var (
 
 	meshPSKFile     = flag.String("mesh-psk-file", defaultMeshPSKFile(), "if non-empty, path to file containing the mesh pre-shared key file. It should contain some hex string; whitespace is trimmed.")
 	meshWith        = flag.String("mesh-with", "", "optional comma-separated list of hostnames to mesh with; the server's own hostname can be in the list. If an entry contains a slash, the second part names a hostname to be used when dialing the target.")
+	secretsURL      = flag.String("secrets-url", "", "SETEC server URL for secrets retrieval of mesh key")
+	secretPrefix    = flag.String("secrets-path-prefix", "prod/derp", "setec path prefix for \""+setecMeshKeyName+"\" secret for DERP mesh key")
+	secretsCacheDir = flag.String("secrets-cache-dir", defaultSetecCacheDir(), "directory to cache setec secrets in (required if --secrets-url is set)")
 	bootstrapDNS    = flag.String("bootstrap-dns-names", "", "optional comma-separated list of hostnames to make available at /bootstrap-dns")
 	unpublishedDNS  = flag.String("unpublished-bootstrap-dns-names", "", "optional comma-separated list of hostnames to make available at /bootstrap-dns and not publish in the list. If an entry contains a slash, the second part names a DNS record to poll for its TXT record with a `0` to `100` value for rollout percentage.")
 	verifyClients   = flag.Bool("verify-clients", false, "verify clients to this DERP server through a local tailscaled instance.")
@@ -84,8 +89,14 @@ var (
 var (
 	tlsRequestVersion = &metrics.LabelMap{Label: "version"}
 	tlsActiveVersion  = &metrics.LabelMap{Label: "version"}
+
+	// Exactly 64 hexadecimal lowercase digits.
+	validMeshKey = regexp.MustCompile(`^[0-9a-f]{64}$`)
 )
 
+const setecMeshKeyName = "meshkey"
+const meshKeyEnvVar = "TAILSCALE_DERPER_MESH_KEY"
+
 func init() {
 	expvar.Publish("derper_tls_request_version", tlsRequestVersion)
 	expvar.Publish("gauge_derper_tls_active_version", tlsActiveVersion)
@@ -141,6 +152,14 @@ func writeNewConfig() config {
 	return cfg
 }
 
+func checkMeshKey(key string) (string, error) {
+	key = strings.TrimSpace(key)
+	if !validMeshKey.MatchString(key) {
+		return "", fmt.Errorf("key in %q must contain 64+ hex digits", key)
+	}
+	return key, nil
+}
+
 func main() {
 	flag.Parse()
 	if *versionFlag {
@@ -177,18 +196,51 @@ func main() {
 	s.SetVerifyClientURLFailOpen(*verifyFailOpen)
 	s.SetTCPWriteTimeout(*tcpWriteTimeout)
 
-	if *meshPSKFile != "" {
+	var meshKey string
-		b, err := os.ReadFile(*meshPSKFile)
+	if *dev {
+		meshKey = os.Getenv(meshKeyEnvVar)
+		if meshKey == "" {
+			log.Printf("No mesh key specified for dev via %s\n", meshKeyEnvVar)
+		} else {
+			log.Printf("Set mesh key from %s\n", meshKeyEnvVar)
+		}
+	} else if *secretsURL != "" {
+		meshKeySecret := path.Join(*secretPrefix, setecMeshKeyName)
+		fc, err := setec.NewFileCache(*secretsCacheDir)
 		if err != nil {
-			log.Fatal(err)
+			log.Fatalf("NewFileCache: %v", err)
 		}
-		key := strings.TrimSpace(string(b))
+		st, err := setec.NewStore(ctx,
-		if matched, _ := regexp.MatchString(`(?i)^[0-9a-f]{64,}$`, key); !matched {
+			setec.StoreConfig{
-			log.Fatalf("key in %s must contain 64+ hex digits", *meshPSKFile)
+				Client: setec.Client{Server: *secretsURL},
+				Secrets: []string{
+					meshKeySecret,
+				},
+				Cache: fc,
+			})
+		if err != nil {
+			log.Fatalf("NewStore: %v", err)
 		}
+		meshKey = st.Secret(meshKeySecret).GetString()
+		log.Println("Got mesh key from setec store")
+	} else if *meshPSKFile != "" {
+		b, err := setec.StaticFile(*meshPSKFile)
+		if err != nil {
+			log.Fatalf("StaticFile failed to get key: %v", err)
+		}
+		log.Println("Got mesh key from static file")
+		meshKey = b.GetString()
+	}
+
+	if meshKey == "" && *dev {
+		log.Printf("No mesh key configured for --dev mode")
+	} else if key, err := checkMeshKey(meshKey); err != nil {
+		log.Fatalf("invalid mesh key: %v", err)
+	} else {
 		s.SetMeshKey(key)
-		log.Printf("DERP mesh key configured")
+		log.Println("DERP mesh key configured")
 	}
+
 	if err := startMesh(s); err != nil {
 		log.Fatalf("startMesh: %v", err)
 	}
@@ -382,6 +434,10 @@ func prodAutocertHostPolicy(_ context.Context, host string) error {
 	return errors.New("invalid hostname")
 }
 
+func defaultSetecCacheDir() string {
+	return filepath.Join(os.Getenv("HOME"), ".cache", "derper-secrets")
+}
+
 func defaultMeshPSKFile() string {
 	try := []string{
 		"/home/derp/keys/derp-mesh.key",

cmd/derper/derper_test.go

@@ -138,3 +138,46 @@ func TestTemplate(t *testing.T) {
 		t.Error("Output is missing debug info")
 	}
 }
+
+func TestCheckMeshKey(t *testing.T) {
+	testCases := []struct {
+		name    string
+		input   string
+		want    string
+		wantErr bool
+	}{
+		{
+			name:    "KeyOkay",
+			input:   "f1ffafffffffffffffffffffffffffffffffffffffffffffffffff2ffffcfff6",
+			want:    "f1ffafffffffffffffffffffffffffffffffffffffffffffffffff2ffffcfff6",
+			wantErr: false,
+		},
+		{
+			name:    "TrimKeyOkay",
+			input:   "  f1ffafffffffffffffffffffffffffffffffffffffffffffffffff2ffffcfff6  ",
+			want:    "f1ffafffffffffffffffffffffffffffffffffffffffffffffffff2ffffcfff6",
+			wantErr: false,
+		},
+		{
+			name:    "NotAKey",
+			input:   "zzthisisnotakey",
+			want:    "",
+			wantErr: true,
+		},
+	}
+	for _, tt := range testCases {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			k, err := checkMeshKey(tt.input)
+			if err != nil && !tt.wantErr {
+				t.Errorf("unexpected error: %v", err)
+			}
+			if k != tt.want && err == nil {
+				t.Errorf("want: %s doesn't match expected: %s", tt.want, k)
+			}
+
+		})
+	}
+
+}

cmd/k8s-operator/depaware.txt

@@ -9,7 +9,6 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
    L    github.com/aws/aws-sdk-go-v2/aws/arn                         from tailscale.com/ipn/store/awsstore
    L    github.com/aws/aws-sdk-go-v2/aws/defaults                    from github.com/aws/aws-sdk-go-v2/service/ssm+
    L    github.com/aws/aws-sdk-go-v2/aws/middleware                  from github.com/aws/aws-sdk-go-v2/aws/retry+
-   L    github.com/aws/aws-sdk-go-v2/aws/middleware/private/metrics  from github.com/aws/aws-sdk-go-v2/aws/retry+
    L    github.com/aws/aws-sdk-go-v2/aws/protocol/query              from github.com/aws/aws-sdk-go-v2/service/sts
    L    github.com/aws/aws-sdk-go-v2/aws/protocol/restjson           from github.com/aws/aws-sdk-go-v2/service/ssm+
    L    github.com/aws/aws-sdk-go-v2/aws/protocol/xml                from github.com/aws/aws-sdk-go-v2/service/sts
@@ -31,10 +30,12 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
    L    github.com/aws/aws-sdk-go-v2/internal/auth                   from github.com/aws/aws-sdk-go-v2/aws/signer/v4+
    L    github.com/aws/aws-sdk-go-v2/internal/auth/smithy            from github.com/aws/aws-sdk-go-v2/service/ssm+
    L    github.com/aws/aws-sdk-go-v2/internal/configsources          from github.com/aws/aws-sdk-go-v2/service/ssm+
+   L    github.com/aws/aws-sdk-go-v2/internal/context                from github.com/aws/aws-sdk-go-v2/aws/retry+
    L    github.com/aws/aws-sdk-go-v2/internal/endpoints              from github.com/aws/aws-sdk-go-v2/service/ssm+
    L    github.com/aws/aws-sdk-go-v2/internal/endpoints/awsrulesfn   from github.com/aws/aws-sdk-go-v2/service/ssm+
    L    github.com/aws/aws-sdk-go-v2/internal/endpoints/v2           from github.com/aws/aws-sdk-go-v2/service/ssm/internal/endpoints+
    L    github.com/aws/aws-sdk-go-v2/internal/ini                    from github.com/aws/aws-sdk-go-v2/config
+   L    github.com/aws/aws-sdk-go-v2/internal/middleware             from github.com/aws/aws-sdk-go-v2/service/sso+
    L    github.com/aws/aws-sdk-go-v2/internal/rand                   from github.com/aws/aws-sdk-go-v2/aws+
    L    github.com/aws/aws-sdk-go-v2/internal/sdk                    from github.com/aws/aws-sdk-go-v2/aws+
    L    github.com/aws/aws-sdk-go-v2/internal/sdkio                  from github.com/aws/aws-sdk-go-v2/credentials/processcreds
@@ -69,11 +70,13 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
    L    github.com/aws/smithy-go/internal/sync/singleflight          from github.com/aws/smithy-go/auth/bearer
    L    github.com/aws/smithy-go/io                                  from github.com/aws/aws-sdk-go-v2/feature/ec2/imds+
    L    github.com/aws/smithy-go/logging                             from github.com/aws/aws-sdk-go-v2/aws+
+   L    github.com/aws/smithy-go/metrics                             from github.com/aws/aws-sdk-go-v2/aws/retry+
    L    github.com/aws/smithy-go/middleware                          from github.com/aws/aws-sdk-go-v2/aws+
    L    github.com/aws/smithy-go/private/requestcompression          from github.com/aws/aws-sdk-go-v2/config
    L    github.com/aws/smithy-go/ptr                                 from github.com/aws/aws-sdk-go-v2/aws+
    L    github.com/aws/smithy-go/rand                                from github.com/aws/aws-sdk-go-v2/aws/middleware+
    L    github.com/aws/smithy-go/time                                from github.com/aws/aws-sdk-go-v2/service/ssm+
+   L    github.com/aws/smithy-go/tracing                             from github.com/aws/aws-sdk-go-v2/aws/middleware+
    L    github.com/aws/smithy-go/transport/http                      from github.com/aws/aws-sdk-go-v2/aws/middleware+
    L    github.com/aws/smithy-go/transport/http/internal/io          from github.com/aws/smithy-go/transport/http
    L    github.com/aws/smithy-go/waiter                              from github.com/aws/aws-sdk-go-v2/service/ssm

cmd/tailscaled/depaware.txt

@@ -10,7 +10,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    L    github.com/aws/aws-sdk-go-v2/aws/arn                         from tailscale.com/ipn/store/awsstore
    L    github.com/aws/aws-sdk-go-v2/aws/defaults                    from github.com/aws/aws-sdk-go-v2/service/ssm+
    L    github.com/aws/aws-sdk-go-v2/aws/middleware                  from github.com/aws/aws-sdk-go-v2/aws/retry+
-   L    github.com/aws/aws-sdk-go-v2/aws/middleware/private/metrics  from github.com/aws/aws-sdk-go-v2/aws/retry+
    L    github.com/aws/aws-sdk-go-v2/aws/protocol/query              from github.com/aws/aws-sdk-go-v2/service/sts
    L    github.com/aws/aws-sdk-go-v2/aws/protocol/restjson           from github.com/aws/aws-sdk-go-v2/service/ssm+
    L    github.com/aws/aws-sdk-go-v2/aws/protocol/xml                from github.com/aws/aws-sdk-go-v2/service/sts
@@ -32,10 +31,12 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    L    github.com/aws/aws-sdk-go-v2/internal/auth                   from github.com/aws/aws-sdk-go-v2/aws/signer/v4+
    L    github.com/aws/aws-sdk-go-v2/internal/auth/smithy            from github.com/aws/aws-sdk-go-v2/service/ssm+
    L    github.com/aws/aws-sdk-go-v2/internal/configsources          from github.com/aws/aws-sdk-go-v2/service/ssm+
+   L    github.com/aws/aws-sdk-go-v2/internal/context                from github.com/aws/aws-sdk-go-v2/aws/retry+
    L    github.com/aws/aws-sdk-go-v2/internal/endpoints              from github.com/aws/aws-sdk-go-v2/service/ssm+
    L    github.com/aws/aws-sdk-go-v2/internal/endpoints/awsrulesfn   from github.com/aws/aws-sdk-go-v2/service/ssm+
    L    github.com/aws/aws-sdk-go-v2/internal/endpoints/v2           from github.com/aws/aws-sdk-go-v2/service/ssm/internal/endpoints+
    L    github.com/aws/aws-sdk-go-v2/internal/ini                    from github.com/aws/aws-sdk-go-v2/config
+   L    github.com/aws/aws-sdk-go-v2/internal/middleware             from github.com/aws/aws-sdk-go-v2/service/sso+
    L    github.com/aws/aws-sdk-go-v2/internal/rand                   from github.com/aws/aws-sdk-go-v2/aws+
    L    github.com/aws/aws-sdk-go-v2/internal/sdk                    from github.com/aws/aws-sdk-go-v2/aws+
    L    github.com/aws/aws-sdk-go-v2/internal/sdkio                  from github.com/aws/aws-sdk-go-v2/credentials/processcreds
@@ -70,11 +71,13 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    L    github.com/aws/smithy-go/internal/sync/singleflight          from github.com/aws/smithy-go/auth/bearer
    L    github.com/aws/smithy-go/io                                  from github.com/aws/aws-sdk-go-v2/feature/ec2/imds+
    L    github.com/aws/smithy-go/logging                             from github.com/aws/aws-sdk-go-v2/aws+
+   L    github.com/aws/smithy-go/metrics                             from github.com/aws/aws-sdk-go-v2/aws/retry+
    L    github.com/aws/smithy-go/middleware                          from github.com/aws/aws-sdk-go-v2/aws+
    L    github.com/aws/smithy-go/private/requestcompression          from github.com/aws/aws-sdk-go-v2/config
    L    github.com/aws/smithy-go/ptr                                 from github.com/aws/aws-sdk-go-v2/aws+
    L    github.com/aws/smithy-go/rand                                from github.com/aws/aws-sdk-go-v2/aws/middleware+
    L    github.com/aws/smithy-go/time                                from github.com/aws/aws-sdk-go-v2/service/ssm+
+   L    github.com/aws/smithy-go/tracing                             from github.com/aws/aws-sdk-go-v2/aws/middleware+
    L    github.com/aws/smithy-go/transport/http                      from github.com/aws/aws-sdk-go-v2/aws/middleware+
    L    github.com/aws/smithy-go/transport/http/internal/io          from github.com/aws/smithy-go/transport/http
    L    github.com/aws/smithy-go/waiter                              from github.com/aws/aws-sdk-go-v2/service/ssm

go.mod

@@ -10,10 +10,10 @@ require (
 	github.com/andybalholm/brotli v1.1.0
 	github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be
 	github.com/atotto/clipboard v0.1.4
-	github.com/aws/aws-sdk-go-v2 v1.24.1
+	github.com/aws/aws-sdk-go-v2 v1.36.0
-	github.com/aws/aws-sdk-go-v2/config v1.26.5
+	github.com/aws/aws-sdk-go-v2/config v1.29.5
-	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.11.64
+	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.17.58
-	github.com/aws/aws-sdk-go-v2/service/s3 v1.33.0
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.75.3
 	github.com/aws/aws-sdk-go-v2/service/ssm v1.44.7
 	github.com/bramvdbogaerde/go-scp v1.4.0
 	github.com/cilium/ebpf v0.15.0
@@ -82,6 +82,7 @@ require (
 	github.com/tailscale/mkctr v0.0.0-20250110151924-54977352e4a6
 	github.com/tailscale/netlink v1.1.1-0.20240822203006-4d49adab4de7
 	github.com/tailscale/peercred v0.0.0-20250107143737-35a0c7bd7edc
+	github.com/tailscale/setec v0.0.0-20250205144240-8898a29c3fbb
 	github.com/tailscale/web-client-prebuilt v0.0.0-20250124233751-d4cd19a26976
 	github.com/tailscale/wf v0.0.0-20240214030419-6fbb0a674ee6
 	github.com/tailscale/wireguard-go v0.0.0-20250107165329-0b8b35511f19
@@ -188,21 +189,21 @@ require (
 	github.com/alingse/asasalint v0.0.11 // indirect
 	github.com/ashanbrown/forbidigo v1.6.0 // indirect
 	github.com/ashanbrown/makezero v1.1.1 // indirect
-	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.10 // indirect
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.8 // indirect
-	github.com/aws/aws-sdk-go-v2/credentials v1.16.16 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.58 // indirect
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.14.11 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.27 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/configsources v1.2.10 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.31 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.5.10 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.31 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/ini v1.7.2 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.2 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.25 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.3.31 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.10.4 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.2 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.28 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.5.5 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.10.10 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.12.12 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.14.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.18.12 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.18.7 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.24.14 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.21.7 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.28.13 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.26.7 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.33.13 // indirect
-	github.com/aws/smithy-go v1.19.0 // indirect
+	github.com/aws/smithy-go v1.22.2 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/bkielbasa/cyclop v1.2.1 // indirect
 	github.com/blakesmith/ar v0.0.0-20190502131153-809d4375e1fb // indirect

go.sum

@@ -123,59 +123,46 @@ github.com/ashanbrown/makezero v1.1.1 h1:iCQ87C0V0vSyO+M9E/FZYbu65auqH0lnsOkf5Fc
 github.com/ashanbrown/makezero v1.1.1/go.mod h1:i1bJLCRSCHOcOa9Y6MyF2FTfMZMFdHvxKHxgO5Z1axI=
 github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
 github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
-github.com/aws/aws-sdk-go-v2 v1.18.0/go.mod h1:uzbQtefpm44goOPmdKyAlXSNcwlRgF3ePWVW6EtJvvw=
+github.com/aws/aws-sdk-go-v2 v1.36.0 h1:b1wM5CcE65Ujwn565qcwgtOTT1aT4ADOHHgglKjG7fk=
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