package identity import ( "crypto/tls" "crypto/x509" "encoding/json" "fmt" "net/http" "net/url" "os" "github.com/pkg/errors" ) // Client wraps http.Client with a transport using the step root and identity. type Client struct { CaURL *url.URL *http.Client } // ResolveReference resolves the given reference from the CaURL. func (c *Client) ResolveReference(ref *url.URL) *url.URL { return c.CaURL.ResolveReference(ref) } // LoadClient configures an http.Client with the root in // $STEPPATH/config/defaults.json and the identity defined in // $STEPPATH/config/identity.json func LoadClient() (*Client, error) { defaultsFile := DefaultsFile() b, err := os.ReadFile(defaultsFile) if err != nil { return nil, errors.Wrapf(err, "error reading %s", defaultsFile) } var defaults defaultsConfig if err := json.Unmarshal(b, &defaults); err != nil { return nil, errors.Wrapf(err, "error unmarshaling %s", defaultsFile) } if err := defaults.Validate(); err != nil { return nil, errors.Wrapf(err, "error validating %s", defaultsFile) } caURL, err := url.Parse(defaults.CaURL) if err != nil { return nil, errors.Wrapf(err, "error validating %s", defaultsFile) } if caURL.Scheme == "" { caURL.Scheme = "https" } identity, err := LoadDefaultIdentity() if err != nil { return nil, err } if err := identity.Validate(); err != nil { return nil, errors.Wrapf(err, "error validating %s", IdentityFile()) } if kind := identity.Kind(); kind != MutualTLS { return nil, errors.Errorf("unsupported identity %s: only mTLS is currently supported", kind) } // Prepare transport with information in defaults.json and identity.json tr := http.DefaultTransport.(*http.Transport).Clone() tr.TLSClientConfig = &tls.Config{ GetClientCertificate: identity.GetClientCertificateFunc(), } // RootCAs b, err = os.ReadFile(defaults.Root) if err != nil { return nil, errors.Wrapf(err, "error loading %s", defaults.Root) } pool := x509.NewCertPool() if pool.AppendCertsFromPEM(b) { tr.TLSClientConfig.RootCAs = pool } return &Client{ CaURL: caURL, Client: &http.Client{ Transport: tr, }, }, nil } type defaultsConfig struct { CaURL string `json:"ca-url"` Root string `json:"root"` } func (c *defaultsConfig) Validate() error { switch { case c.CaURL == "": return fmt.Errorf("missing or invalid `ca-url` property") case c.Root == "": return fmt.Errorf("missing or invalid `root` property") default: return nil } }