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add support for authentication with EKS Pod Identities #1944

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merged 1 commit into from
Mar 3, 2024
Merged

add support for authentication with EKS Pod Identities #1944

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22 changes: 22 additions & 0 deletions pkg/credentials/iam_aws.go
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,7 @@ type IAM struct {
// Support for container authorization token https://docs.aws.amazon.com/sdkref/latest/guide/feature-container-credentials.html
Container struct {
AuthorizationToken string
AuthorizationTokenFile string
CredentialsFullURI string
CredentialsRelativeURI string
}
Expand Down Expand Up @@ -105,6 +106,11 @@ func (m *IAM) Retrieve() (Value, error) {
token = m.Container.AuthorizationToken
}

tokenFile := os.Getenv("AWS_CONTAINER_AUTHORIZATION_TOKEN_FILE")
if tokenFile == "" {
tokenFile = m.Container.AuthorizationToken
}

relativeURI := os.Getenv("AWS_CONTAINER_CREDENTIALS_RELATIVE_URI")
if relativeURI == "" {
relativeURI = m.Container.CredentialsRelativeURI
Expand Down Expand Up @@ -181,6 +187,10 @@ func (m *IAM) Retrieve() (Value, error) {

roleCreds, err = getEcsTaskCredentials(m.Client, endpoint, token)

case tokenFile != "" && fullURI != "":
endpoint = fullURI
roleCreds, err = getEKSPodIdentityCredentials(m.Client, endpoint, tokenFile)

case fullURI != "":
if len(endpoint) == 0 {
endpoint = fullURI
Expand Down Expand Up @@ -305,6 +315,18 @@ func getEcsTaskCredentials(client *http.Client, endpoint, token string) (ec2Role
return respCreds, nil
}

func getEKSPodIdentityCredentials(client *http.Client, endpoint string, tokenFile string) (ec2RoleCredRespBody, error) {
if tokenFile != "" {
bytes, err := os.ReadFile(tokenFile)
if err != nil {
return ec2RoleCredRespBody{}, fmt.Errorf("getEKSPodIdentityCredentials: failed to read token file:%s", err)
}
token := string(bytes)
return getEcsTaskCredentials(client, endpoint, token)
}
return ec2RoleCredRespBody{}, fmt.Errorf("getEKSPodIdentityCredentials: no tokenFile found")
}

func fetchIMDSToken(client *http.Client, endpoint string) (string, error) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
Expand Down
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