Skip to content

feat: use IMDSv2 for requests #3

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 2 commits into
base: development
Choose a base branch
from
Open

feat: use IMDSv2 for requests #3

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
8a25f85
feat: use IMDSv2 for requests
MatheusAfinovicz Apr 13, 2023
886b370
fix: sign request error message
MatheusAfinovicz Apr 17, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
35 changes: 34 additions & 1 deletion pkg/metadata/provider_aws.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -90,6 +90,34 @@ func awsMetaGet(lookupName string, fileName string, fileMode os.FileMode) {
}
}

func signRequest(req *http.Request, client *http.Client) (*http.Request, error) {
tokenReq, err := http.NewRequest("PUT", "http://169.254.169.254/latest/api/token", nil)
if err != nil {
return req, err
}

tokenReq.Header.Add("X-aws-ec2-metadata-token-ttl-seconds", "21600")

tokenRes, err := client.Do(tokenReq)
if err != nil {
return req, err
}
if tokenRes.StatusCode != 200 {
return req, fmt.Errorf("AWS: Status not ok: %d", tokenRes.StatusCode)
}

tokenBytes, err := io.ReadAll(tokenRes.Body)
if err != nil {
return req, err
}

token := string(tokenBytes)

req.Header.Add("X-aws-ec2-metadata-token", token)

return req, nil
}

// awsGet requests and extracts the requested URL
func awsGet(url string) ([]byte, error) {
var client = &http.Client{
Expand All @@ -101,7 +129,12 @@ func awsGet(url string) ([]byte, error) {
return nil, fmt.Errorf("AWS: http.NewRequest failed: %s", err)
}

resp, err := client.Do(req)
signedReq, err := signRequest(req, client)
if err != nil {
return nil, fmt.Errorf("AWS: Could not sign metadata request: %s", err)
}

resp, err := client.Do(signedReq)
if err != nil {
return nil, fmt.Errorf("AWS: Could not contact metadata service: %s", err)
}
Expand Down