ssh: improve 'whoami' format (#5714)

Old:
```
User ID:    xxx
Session ID: xxx
Expires at: 2025-07-10 08:39:40.64992461 +0000 UTC
Claims:
  aud: [xxx]
  email: [foo@bar.com]
  email_verified: [true]
  exp: [1.75212238e+09]
  family_name: [bar]
  given_name: [foo]
  iat: [1.75208638e+09]
  iss: [https://example.com]
  name: [Foo Bar]
  nickname: [foobar]
  picture: [https://example.com]
  sub: [xxx]
  updated_at: [2025-07-09T18:12:15.226Z]
```

New:
```
User ID:    xxx
Session ID: xxx
Expires at: 2025-07-10 11:23:27.641004885 +0000 UTC (in 13h59m57s)
Claims:
  aud: "xxx"
  email: "foo@bar.com"
  email_verified: true
  exp: 2025-07-10 07:23:27 +0000 UTC (in 9h59m56s)
  family_name: "bar"
  given_name: "foo"
  iat: 2025-07-09 21:23:27 +0000 UTC (4s ago)
  iss: "https://example.com"
  name: "Foo Bar"
  nickname: "foobar"
  picture: "https://example.com"
  sub: "xxx"
  updated_at: "2025-07-09T18:12:15.226Z"

```

internal/testutil/mockidp/mockidp.go

@@ -337,7 +337,7 @@ func (state state) GetUserInfo(users map[string]*User) *userInfo {
 	for _, u := range users {
 		if u.Email == state.Email {
 			userInfo.Subject = u.ID
-			userInfo.Name = u.FirstName + " " + u.LastName
+			userInfo.Name = strings.TrimSpace(u.FirstName + " " + u.LastName)
 			userInfo.FamilyName = u.LastName
 			userInfo.GivenName = u.FirstName
 		}

pkg/ssh/auth.go

@@ -6,7 +6,8 @@ import (
 	"crypto/sha256"
 	"encoding/base64"
 	"errors"
-	"text/template"
+	"fmt"
+	"slices"
 	"time"
 
 	oteltrace "go.opentelemetry.io/otel/trace"
@@ -258,9 +259,48 @@ func (a *Auth) FormatSession(ctx context.Context, info StreamAuthInfo) ([]byte,
 		return nil, err
 	}
 	var b bytes.Buffer
-	err = sessionInfoTmpl.Execute(&b, session)
-	if err != nil {
-		return nil, err
+	fmt.Fprintf(&b, "User ID:    %s\n", session.UserId)
+	fmt.Fprintf(&b, "Session ID: %s\n", sessionID)
+	fmt.Fprintf(&b, "Expires at: %s (in %s)\n",
+		session.ExpiresAt.AsTime().String(),
+		time.Until(session.ExpiresAt.AsTime()).Round(time.Second))
+	fmt.Fprintf(&b, "Claims:\n")
+	keys := make([]string, 0, len(session.Claims))
+	for key := range session.Claims {
+		keys = append(keys, key)
+	}
+	slices.Sort(keys)
+	for _, key := range keys {
+		fmt.Fprintf(&b, "  %s: ", key)
+		vs := session.Claims[key].AsSlice()
+		if len(vs) != 1 {
+			b.WriteRune('[')
+		}
+		if len(vs) == 1 {
+			switch key {
+			case "iat":
+				d, _ := vs[0].(float64)
+				t := time.Unix(int64(d), 0)
+				fmt.Fprintf(&b, "%s (%s ago)", t, time.Since(t).Round(time.Second))
+			case "exp":
+				d, _ := vs[0].(float64)
+				t := time.Unix(int64(d), 0)
+				fmt.Fprintf(&b, "%s (in %s)", t, time.Until(t).Round(time.Second))
+			default:
+				fmt.Fprintf(&b, "%#v", vs[0])
+			}
+		} else if len(vs) > 1 {
+			for i, v := range vs {
+				fmt.Fprintf(&b, "%#v", v)
+				if i < len(vs)-1 {
+					b.WriteString(", ")
+				}
+			}
+		}
+		if len(vs) != 1 {
+			b.WriteRune(']')
+		}
+		b.WriteRune('\n')
 	}
 	return b.Bytes(), nil
 }
@@ -375,13 +415,3 @@ func sshRequestFromStreamAuthInfo(info StreamAuthInfo) (*Request, error) {
 		LogOnlyIfDenied: info.InitialAuthComplete,
 	}, nil
 }
-
-var sessionInfoTmpl = template.Must(template.New("session-info").Parse(`
-User ID:    {{.UserId}}
-Session ID: {{.Id}}
-Expires at: {{.ExpiresAt.AsTime}}
-Claims:
-{{- range $k, $v := .Claims }}
-  {{ $k }}: {{ $v.AsSlice }}
-{{- end }}
-`))

pkg/ssh/auth_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -361,6 +362,7 @@ func TestFormatSession(t *testing.T) {
 		assert.ErrorContains(t, err, "invalid public key fingerprint")
 	})
 	t.Run("ok", func(t *testing.T) {
+		exp := time.Now().Add(1 * time.Minute)
 		client := fakeDataBrokerServiceClient{
 			get: func(
 				_ context.Context, in *databroker.GetRequest, _ ...grpc.CallOption,
@@ -379,7 +381,7 @@ func TestFormatSession(t *testing.T) {
 						Data: protoutil.NewAny(&session.Session{
 							Id:        expectedID,
 							UserId:    "USER-ID",
-							ExpiresAt: &timestamppb.Timestamp{Seconds: 1750965358},
+							ExpiresAt: timestamppb.New(exp),
 							Claims:    claims.ToPB(),
 						}),
 					},
@@ -392,14 +394,14 @@ func TestFormatSession(t *testing.T) {
 		}
 		b, err := a.FormatSession(t.Context(), info)
 		assert.NoError(t, err)
-		assert.Equal(t, string(b), `
+		assert.Regexp(t, `
 User ID:    USER-ID
 Session ID: sshkey-SHA256:QUJDREVGR0hJSktMTU5PUFFSU1RVVldYWVoxMjM0NTY
-Expires at: 2025-06-26 19:15:58 +0000 UTC
+Expires at: .* \(in 1m0s\)
 Claims:
-  foo: [bar baz]
-  quux: [42]
-`)
+  foo: \["bar", "baz"\]
+  quux: 42
+`[1:], string(b))
 	})
 }
 

pkg/ssh/ssh_int_test.go

@@ -331,18 +331,18 @@ func (s *SSHTestSuite) TestWhoami() {
 	s.Regexp(s.executeTemplate(`
 User ID:    .*
 Session ID: sshkey-{{.PublicKeyFingerprint | quoteMeta}}
-Expires at: .*
+Expires at: .* \(in \d+h\d+m\d+s\)
 Claims:
-  aud: \[CLIENT_ID\]
-  email: \[{{.Email | quoteMeta}}\]
-  exp: \[.*\]
-  family_name: \[\]
-  given_name: \[\]
-  iat: \[.*\]
-  iss: \[https://mock-idp\..*\]
-  name: \[ \]
-  sub: \[.*\]
-`), string(output))
+  aud: "CLIENT_ID"
+  email: "{{.Email | quoteMeta}}"
+  exp: .* \(in \d+h\d+m\d+s\)
+  family_name: ""
+  given_name: ""
+  iat: .* \(\d+s ago\)
+  iss: "https://mock-idp\..*"
+  name: ""
+  sub: ".*"
+`[1:]), string(output))
 }
 
 func TestSSH(t *testing.T) {