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filters/auth: implement opt-out support for jwtMetrics
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Extend configuration of `jwtMetrics` (#3020) to support opt-out -
disable metrics collection when any of the configured
route annotations (#3022) is present.

This can be used to collect data about missing/invalid JWT tokens per hostname
in multitenant ingress setup.

Add `jwtMetrics` filter to all routes using `-default-filters-append` flag and
allow users to annotate routes that do not require JWT token.

Signed-off-by: Alexander Yastrebov <alexander.yastrebov@zalando.de>
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@AlexanderYastrebov
AlexanderYastrebov committed Apr 19, 2024
1 parent 0ce11b9 commit 8976d88
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Showing 3 changed files with 114 additions and 54 deletions.
6 changes: 5 additions & 1 deletion docs/reference/filters.md
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Expand Up @@ -1583,7 +1583,11 @@ For convenience use [flow style format](https://yaml.org/spec/1.2.2/#chapter-7-f
Examples:

```
jwtMetrics("{issuers: ['https://example.com', 'https://example.org']}")
jwtMetrics("{issuers: ['https://example.com', 'https://example.org']")
// opt-out
annotate("oauth.disabled", "this endpoint is public") ->
jwtMetrics("{issuers: ['https://example.com', 'https://example.org'], optOutAnnotations: [oauth.disabled]}")
```


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13 changes: 12 additions & 1 deletion filters/auth/jwt_metrics.go
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Expand Up @@ -8,14 +8,16 @@ import (

"github.com/ghodss/yaml"
"github.com/zalando/skipper/filters"
"github.com/zalando/skipper/filters/annotate"
"github.com/zalando/skipper/jwt"
)

type (
jwtMetricsSpec struct{}

jwtMetricsFilter struct {
Issuers []string `json:"issuers,omitempty"`
Issuers []string `json:"issuers,omitempty"`
OptOutAnnotations []string `json:"optOutAnnotations,omitempty"`
}
)

Expand Down Expand Up @@ -46,6 +48,15 @@ func (s *jwtMetricsSpec) CreateFilter(args []interface{}) (filters.Filter, error
func (f *jwtMetricsFilter) Request(ctx filters.FilterContext) {}

func (f *jwtMetricsFilter) Response(ctx filters.FilterContext) {
if len(f.OptOutAnnotations) > 0 {
annotations := annotate.GetAnnotations(ctx)
for _, annotation := range f.OptOutAnnotations {
if _, ok := annotations[annotation]; ok {
return // opt-out
}
}
}

response := ctx.Response()

if response.StatusCode >= 400 && response.StatusCode < 500 {
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149 changes: 97 additions & 52 deletions filters/auth/jwt_metrics_test.go
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Expand Up @@ -3,155 +3,200 @@ package auth_test
import (
"encoding/base64"
"encoding/json"
"fmt"
"net/http"
"net/url"
"testing"

"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/zalando/skipper/eskip"
"github.com/zalando/skipper/filters/auth"
"github.com/zalando/skipper/filters/filtertest"
"github.com/zalando/skipper/filters/builtin"
"github.com/zalando/skipper/metrics"
"github.com/zalando/skipper/metrics/metricstest"
"github.com/zalando/skipper/proxy/proxytest"
"github.com/zalando/skipper/routing"
)

func TestJwtMetrics(t *testing.T) {
spec := auth.NewJwtMetrics()

for _, tc := range []struct {
name string
def string
filters string
request *http.Request
response *http.Response
status int
expected map[string]int64
}{
{
name: "ignores 401 response",
def: `jwtMetrics("{issuers: [foo, bar]}")`,
filters: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test"},
response: &http.Response{StatusCode: http.StatusUnauthorized},
status: http.StatusUnauthorized,
expected: map[string]int64{},
},
{
name: "ignores 403 response",
def: `jwtMetrics("{issuers: [foo, bar]}")`,
filters: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test"},
response: &http.Response{StatusCode: http.StatusForbidden},
status: http.StatusForbidden,
expected: map[string]int64{},
},
{
name: "ignores 404 response",
def: `jwtMetrics("{issuers: [foo, bar]}")`,
filters: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test"},
response: &http.Response{StatusCode: http.StatusNotFound},
status: http.StatusNotFound,
expected: map[string]int64{},
},
{
name: "missing-token",
def: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test"},
response: &http.Response{StatusCode: http.StatusOK},
name: "missing-token",
filters: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test"},
status: http.StatusOK,
expected: map[string]int64{
"GET.foo_test.200.missing-token": 1,
"jwtMetrics.custom.GET.foo_test.200.missing-token": 1,
},
},
{
name: "invalid-token-type",
def: `jwtMetrics("{issuers: [foo, bar]}")`,
name: "invalid-token-type",
filters: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test",
Header: http.Header{"Authorization": []string{"Basic foobarbaz"}},
},
response: &http.Response{StatusCode: http.StatusOK},
status: http.StatusOK,
expected: map[string]int64{
"GET.foo_test.200.invalid-token-type": 1,
"jwtMetrics.custom.GET.foo_test.200.invalid-token-type": 1,
},
},
{
name: "invalid-token",
def: `jwtMetrics("{issuers: [foo, bar]}")`,
name: "invalid-token",
filters: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test",
Header: http.Header{"Authorization": []string{"Bearer invalid-token"}},
},
response: &http.Response{StatusCode: http.StatusOK},
status: http.StatusOK,
expected: map[string]int64{
"GET.foo_test.200.invalid-token": 1,
"jwtMetrics.custom.GET.foo_test.200.invalid-token": 1,
},
},
{
name: "missing-issuer",
def: `jwtMetrics("{issuers: [foo, bar]}")`,
name: "missing-issuer",
filters: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test",
Header: http.Header{"Authorization": []string{
"Bearer header." + marshalBase64JSON(t, map[string]any{"sub": "baz"}) + ".signature",
}},
},
response: &http.Response{StatusCode: http.StatusOK},
status: http.StatusOK,
expected: map[string]int64{
"GET.foo_test.200.missing-issuer": 1,
"jwtMetrics.custom.GET.foo_test.200.missing-issuer": 1,
},
},
{
name: "invalid-issuer",
def: `jwtMetrics("{issuers: [foo, bar]}")`,
name: "invalid-issuer",
filters: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test",
Header: http.Header{"Authorization": []string{
"Bearer header." + marshalBase64JSON(t, map[string]any{"iss": "baz"}) + ".signature",
}},
},
response: &http.Response{StatusCode: http.StatusOK},
status: http.StatusOK,
expected: map[string]int64{
"GET.foo_test.200.invalid-issuer": 1,
"jwtMetrics.custom.GET.foo_test.200.invalid-issuer": 1,
},
},
{
name: "no invalid-issuer for empty issuers",
def: `jwtMetrics()`,
name: "no invalid-issuer for empty issuers",
filters: `jwtMetrics()`,
request: &http.Request{Method: "GET", Host: "foo.test",
Header: http.Header{"Authorization": []string{
"Bearer header." + marshalBase64JSON(t, map[string]any{"iss": "baz"}) + ".signature",
}},
},
response: &http.Response{StatusCode: http.StatusOK},
status: http.StatusOK,
expected: map[string]int64{},
},
{
name: "no invalid-issuer when matches first",
def: `jwtMetrics("{issuers: [foo, bar]}")`,
name: "no invalid-issuer when matches first",
filters: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test",
Header: http.Header{"Authorization": []string{
"Bearer header." + marshalBase64JSON(t, map[string]any{"iss": "foo"}) + ".signature",
}},
},
response: &http.Response{StatusCode: http.StatusOK},
status: http.StatusOK,
expected: map[string]int64{},
},
{
name: "no invalid-issuer when matches second",
def: `jwtMetrics("{issuers: [foo, bar]}")`,
name: "no invalid-issuer when matches second",
filters: `jwtMetrics("{issuers: [foo, bar]}")`,
request: &http.Request{Method: "GET", Host: "foo.test",
Header: http.Header{"Authorization": []string{
"Bearer header." + marshalBase64JSON(t, map[string]any{"iss": "bar"}) + ".signature",
}},
},
response: &http.Response{StatusCode: http.StatusOK},
status: http.StatusOK,
expected: map[string]int64{},
},
{
name: "missing-token without opt-out",
filters: `jwtMetrics("{issuers: [foo, bar], optOutAnnotations: [oauth.disabled]}")`,
request: &http.Request{Method: "GET", Host: "foo.test"},
status: http.StatusOK,
expected: map[string]int64{
"jwtMetrics.custom.GET.foo_test.200.missing-token": 1,
},
},
{
name: "no metrics when opted-out",
filters: `
annotate("oauth.disabled", "this endpoint is public") ->
jwtMetrics("{issuers: [foo, bar], optOutAnnotations: [oauth.disabled, jwtMetrics.disabled]}")
`,
request: &http.Request{Method: "GET", Host: "foo.test"},
status: http.StatusOK,
expected: map[string]int64{},
},
{
name: "no metrics when opted-out by alternative annotation",
filters: `
annotate("jwtMetrics.disabled", "skip jwt metrics collection") ->
jwtMetrics("{issuers: [foo, bar], optOutAnnotations: [oauth.disabled, jwtMetrics.disabled]}")
`,
request: &http.Request{Method: "GET", Host: "foo.test"},
status: http.StatusOK,
expected: map[string]int64{},
},
} {
t.Run(tc.name, func(t *testing.T) {
args := eskip.MustParseFilters(tc.def)[0].Args
dm := metrics.Default
t.Cleanup(func() { metrics.Default = dm })
m := &metricstest.MockMetrics{}
metrics.Default = m
defer m.Close()

fr := builtin.MakeRegistry()
fr.Register(auth.NewJwtMetrics())
p := proxytest.Config{
RoutingOptions: routing.Options{
FilterRegistry: fr,
},
Routes: eskip.MustParse(fmt.Sprintf(`* -> %s -> status(%d) -> <shunt>`, tc.filters, tc.status)),
}.Create()
defer p.Close()

u, err := url.Parse(p.URL)
require.NoError(t, err)
tc.request.URL = u

filter, err := spec.CreateFilter(args)
resp, err := p.Client().Do(tc.request)
require.NoError(t, err)
resp.Body.Close()

metrics := &metricstest.MockMetrics{}
ctx := &filtertest.Context{
FRequest: tc.request,
FMetrics: metrics,
}
filter.Request(ctx)
ctx.FResponse = tc.response
filter.Response(ctx)
m.WithCounters(func(counters map[string]int64) {
// add incoming counter to simplify comparison
tc.expected["incoming.HTTP/1.1"] = 1

metrics.WithCounters(func(counters map[string]int64) {
assert.Equal(t, tc.expected, counters)
})
})
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