crowdsec/pkg/apiclient/auth_jwt.go

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package apiclient
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"net/http/httputil"
"net/url"
"sync"
"time"
"github.com/go-openapi/strfmt"
log "github.com/sirupsen/logrus"
"github.com/crowdsecurity/crowdsec/pkg/models"
)
type JWTTransport struct {
MachineID *string
Password *strfmt.Password
Token string
Expiration time.Time
Scenarios []string
URL *url.URL
VersionPrefix string
UserAgent string
// Transport is the underlying HTTP transport to use when making requests.
// It will default to http.DefaultTransport if nil.
Transport http.RoundTripper
UpdateScenario func() ([]string, error)
refreshTokenMutex sync.Mutex
}
func (t *JWTTransport) refreshJwtToken() error {
var err error
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if t.UpdateScenario != nil {
t.Scenarios, err = t.UpdateScenario()
if err != nil {
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return fmt.Errorf("can't update scenario list: %w", err)
}
log.Debugf("scenarios list updated for '%s'", *t.MachineID)
}
auth := models.WatcherAuthRequest{
MachineID: t.MachineID,
Password: t.Password,
Scenarios: t.Scenarios,
}
/*
we don't use the main client, so let's build the body
*/
var buf io.ReadWriter = &bytes.Buffer{}
enc := json.NewEncoder(buf)
enc.SetEscapeHTML(false)
err = enc.Encode(auth)
if err != nil {
return fmt.Errorf("could not encode jwt auth body: %w", err)
}
req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s%s/watchers/login", t.URL, t.VersionPrefix), buf)
if err != nil {
return fmt.Errorf("could not create request: %w", err)
}
req.Header.Add("Content-Type", "application/json")
client := &http.Client{
Transport: &retryRoundTripper{
next: http.DefaultTransport,
maxAttempts: 5,
withBackOff: true,
retryStatusCodes: []int{http.StatusTooManyRequests, http.StatusServiceUnavailable, http.StatusGatewayTimeout, http.StatusInternalServerError},
},
}
if t.UserAgent != "" {
req.Header.Add("User-Agent", t.UserAgent)
}
if log.GetLevel() >= log.TraceLevel {
dump, _ := httputil.DumpRequest(req, true)
log.Tracef("auth-jwt request: %s", string(dump))
}
log.Debugf("auth-jwt(auth): %s %s", req.Method, req.URL.String())
resp, err := client.Do(req)
if err != nil {
return fmt.Errorf("could not get jwt token: %w", err)
}
log.Debugf("auth-jwt : http %d", resp.StatusCode)
if log.GetLevel() >= log.TraceLevel {
dump, _ := httputil.DumpResponse(resp, true)
log.Tracef("auth-jwt response: %s", string(dump))
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
log.Debugf("received response status %q when fetching %v", resp.Status, req.URL)
err = CheckResponse(resp)
if err != nil {
return err
}
}
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var response models.WatcherAuthResponse
if err := json.NewDecoder(resp.Body).Decode(&response); err != nil {
return fmt.Errorf("unable to decode response: %w", err)
}
if err := t.Expiration.UnmarshalText([]byte(response.Expire)); err != nil {
return fmt.Errorf("unable to parse jwt expiration: %w", err)
}
t.Token = response.Token
log.Debugf("token %s will expire on %s", t.Token, t.Expiration.String())
return nil
}
// RoundTrip implements the RoundTripper interface.
func (t *JWTTransport) RoundTrip(req *http.Request) (*http.Response, error) {
// In a few occasions several goroutines will execute refreshJwtToken concurrently which is useless and will cause overload on CAPI
// we use a mutex to avoid this
// We also bypass the refresh if we are requesting the login endpoint, as it does not require a token, and it leads to do 2 requests instead of one (refresh + actual login request)
t.refreshTokenMutex.Lock()
if req.URL.Path != "/"+t.VersionPrefix+"/watchers/login" && (t.Token == "" || t.Expiration.Add(-time.Minute).Before(time.Now().UTC())) {
if err := t.refreshJwtToken(); err != nil {
t.refreshTokenMutex.Unlock()
return nil, err
}
}
t.refreshTokenMutex.Unlock()
if t.UserAgent != "" {
req.Header.Add("User-Agent", t.UserAgent)
}
req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", t.Token))
if log.GetLevel() >= log.TraceLevel {
//requestToDump := cloneRequest(req)
dump, _ := httputil.DumpRequest(req, true)
log.Tracef("req-jwt: %s", string(dump))
}
// Make the HTTP request.
resp, err := t.transport().RoundTrip(req)
if log.GetLevel() >= log.TraceLevel {
dump, _ := httputil.DumpResponse(resp, true)
log.Tracef("resp-jwt: %s (err:%v)", string(dump), err)
}
if err != nil {
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// we had an error (network error for example, or 401 because token is refused), reset the token?
t.Token = ""
return resp, fmt.Errorf("performing jwt auth: %w", err)
}
if resp != nil {
log.Debugf("resp-jwt: %d", resp.StatusCode)
}
return resp, nil
}
func (t *JWTTransport) Client() *http.Client {
return &http.Client{Transport: t}
}
func (t *JWTTransport) ResetToken() {
log.Debug("resetting jwt token")
t.refreshTokenMutex.Lock()
t.Token = ""
t.refreshTokenMutex.Unlock()
}
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// transport() returns a round tripper that retries once when the status is unauthorized, and 5 times when the infrastructure is overloaded.
func (t *JWTTransport) transport() http.RoundTripper {
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transport := t.Transport
if transport == nil {
transport = http.DefaultTransport
}
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return &retryRoundTripper{
next: &retryRoundTripper{
next: transport,
maxAttempts: 5,
withBackOff: true,
retryStatusCodes: []int{http.StatusTooManyRequests, http.StatusServiceUnavailable, http.StatusGatewayTimeout},
},
maxAttempts: 2,
withBackOff: false,
retryStatusCodes: []int{http.StatusUnauthorized, http.StatusForbidden},
onBeforeRequest: func(attempt int) {
// reset the token only in the second attempt as this is when we know we had a 401 or 403
// the second attempt is supposed to refresh the token
if attempt > 0 {
t.ResetToken()
}
},
}
}