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utils.go
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utils.go
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package main
import (
"crypto/sha1"
"crypto/tls"
"fmt"
"net/url"
"strings"
"context"
"github.com/pkg/errors"
"github.com/aws/aws-lambda-go/lambdacontext"
)
func (p *identityProvider) setAccountID(ctx context.Context) error {
lc, _ := lambdacontext.FromContext(ctx)
if lc == nil {
return fmt.Errorf("could not get account ID: nil LambdaContext; ")
}
if lc.InvokedFunctionArn == "" {
return fmt.Errorf("could not get account ID: empty InvokedFunctionArn")
}
p.accountID = strings.Split(lc.InvokedFunctionArn, ":")[4]
return nil
}
func getIssuerCAThumbprint(issuer string) (*string, error) {
config := &tls.Config{InsecureSkipVerify: true}
issuerURL, err := url.Parse(issuer)
if err != nil {
return nil, fmt.Errorf("unable to parse OIDC issuer's url")
}
if issuerURL.Scheme != "https" {
return nil, fmt.Errorf("unsupported URL scheme %q", issuerURL.Scheme)
}
if issuerURL.Port() == "" {
issuerURL.Host += ":443"
}
conn, err := tls.Dial("tcp", issuerURL.Host, config)
if err != nil {
return nil, errors.Wrapf(err, "connecting to issuer OIDC (%s)", issuerURL)
}
defer conn.Close()
cs := conn.ConnectionState()
if numCerts := len(cs.PeerCertificates); numCerts >= 1 {
root := cs.PeerCertificates[numCerts-1]
issuerCAThumbprint := fmt.Sprintf("%x", sha1.Sum(root.Raw))
return &issuerCAThumbprint, nil
}
return nil, fmt.Errorf("unable to get OIDC issuer's certificate")
}