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package ec2metadata import ( "fmt" "github.com/aws/aws-sdk-go/aws" "net/http" "sync/atomic" "time" "github.com/aws/aws-sdk-go/aws/awserr" "github.com/aws/aws-sdk-go/aws/credentials" "github.com/aws/aws-sdk-go/aws/request" ) // A tokenProvider struct provides access to EC2Metadata client // and atomic instance of a token, along with configuredTTL for it. // tokenProvider also provides an atomic flag to disable the // fetch token operation. // The disabled member will use 0 as false, and 1 as true. type tokenProvider struct { client *EC2Metadata token atomic.Value configuredTTL time.Duration disabled uint32 } // A ec2Token struct helps use of token in EC2 Metadata service ops type ec2Token struct { token string credentials.Expiry } // newTokenProvider provides a pointer to a tokenProvider instance func newTokenProvider(c *EC2Metadata, duration time.Duration) *tokenProvider { return &tokenProvider{client: c, configuredTTL: duration} } // check if fallback is enabled func (t *tokenProvider) fallbackEnabled() bool { return t.client.Config.EC2MetadataEnableFallback == nil || *t.client.Config.EC2MetadataEnableFallback } // fetchTokenHandler fetches token for EC2Metadata service client by default. func (t *tokenProvider) fetchTokenHandler(r *request.Request) { // short-circuits to insecure data flow if tokenProvider is disabled. if v := atomic.LoadUint32(&t.disabled); v == 1 && t.fallbackEnabled() { return } if ec2Token, ok := t.token.Load().(ec2Token); ok && !ec2Token.IsExpired() { r.HTTPRequest.Header.Set(tokenHeader, ec2Token.token) return } output, err := t.client.getToken(r.Context(), t.configuredTTL) if err != nil { // only attempt fallback to insecure data flow if IMDSv1 is enabled if !t.fallbackEnabled() { r.Error = awserr.New("EC2MetadataError", "failed to get IMDSv2 token and fallback to IMDSv1 is disabled", err) return } // change the disabled flag on token provider to true and fallback if requestFailureError, ok := err.(awserr.RequestFailure); ok { switch requestFailureError.StatusCode() { case http.StatusForbidden, http.StatusNotFound, http.StatusMethodNotAllowed: atomic.StoreUint32(&t.disabled, 1) if t.client.Config.LogLevel.Matches(aws.LogDebugWithDeprecated) { t.client.Config.Logger.Log(fmt.Sprintf("WARN: failed to get session token, falling back to IMDSv1: %v", requestFailureError)) } case http.StatusBadRequest: r.Error = requestFailureError } } return } newToken := ec2Token{ token: output.Token, } newToken.SetExpiration(time.Now().Add(output.TTL), ttlExpirationWindow) t.token.Store(newToken) // Inject token header to the request. if ec2Token, ok := t.token.Load().(ec2Token); ok { r.HTTPRequest.Header.Set(tokenHeader, ec2Token.token) } } // enableTokenProviderHandler enables the token provider func (t *tokenProvider) enableTokenProviderHandler(r *request.Request) { // If the error code status is 401, we enable the token provider if e, ok := r.Error.(awserr.RequestFailure); ok && e != nil && e.StatusCode() == http.StatusUnauthorized { t.token.Store(ec2Token{}) atomic.StoreUint32(&t.disabled, 0) } }