v0.0.1

MOVED:
* This codebase was originally part of r00t2.io/sysutils but has been
  split off to its own library.

funcs_tlsflat.go

@@ -0,0 +1,217 @@
+package cryptparse
+
+import (
+	`bytes`
+	`crypto`
+	`crypto/tls`
+	`crypto/x509`
+	`errors`
+	`fmt`
+	`net/url`
+	`os`
+	`strings`
+
+	`r00t2.io/sysutils/paths`
+)
+
+// Normalize ensures that all specified filepaths are absolute, etc.
+func (t *TlsFlat) Normalize() (err error) {
+
+	if t.Certs != nil {
+		for _, c := range t.Certs {
+			if err = paths.RealPath(&c.CertFile); err != nil {
+				return
+			}
+			if c.KeyFile != nil {
+				if err = paths.RealPath(c.KeyFile); err != nil {
+					return
+				}
+			}
+		}
+	}
+	if t.CaFiles != nil {
+		for idx, _ := range t.CaFiles {
+			if err = paths.RealPath(&t.CaFiles[idx]); err != nil {
+				return
+			}
+		}
+	}
+
+	return
+}
+
+/*
+	ToTlsConfig returns a tls.Config from a TlsFlat. Note that it will have Normalize called on it.
+
+	Unfortunately it's not possible for this library to do the reverse, as CA certificates are not able to be extracted from an x509.CertPool.
+*/
+func (t *TlsFlat) ToTlsConfig() (tlsConf *tls.Config, err error) {
+
+	var b []byte
+	var rootCAs *x509.CertPool
+	var intermediateCAs []*x509.Certificate
+	var privKeys []crypto.PrivateKey
+	var tlsCerts []tls.Certificate
+	var parsedTlsCerts []tls.Certificate
+	var ciphers []uint16
+	var curves []tls.CurveID
+	var minVer uint16
+	var maxVer uint16
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var srvNm string = t.SniName
+
+	// Normalize any filepaths before validation.
+	if err = t.Normalize(); err != nil {
+		return
+	}
+
+	// And validate.
+	if err = validate.Struct(t); err != nil {
+		return
+	}
+
+	// CA cert(s).
+	buf.Reset()
+	if t.CaFiles != nil {
+		rootCAs = x509.NewCertPool()
+		for _, c := range t.CaFiles {
+			if b, err = os.ReadFile(c); err != nil {
+				if errors.Is(err, os.ErrNotExist) {
+					err = nil
+					continue
+				}
+			}
+			buf.Write(b)
+		}
+		if rootCAs, _, intermediateCAs, err = ParseCA(buf.Bytes()); err != nil {
+			return
+		}
+	} else {
+		if rootCAs, err = x509.SystemCertPool(); err != nil {
+			return
+		}
+	}
+
+	// Keys and Certs. They are assumed to be matched.
+	if t.Certs != nil {
+		for _, c := range t.Certs {
+			privKeys = nil
+			if c.KeyFile != nil {
+				if b, err = os.ReadFile(*c.KeyFile); err != nil {
+					return
+				}
+				if privKeys, err = ParsePrivateKey(b); err != nil {
+					return
+				}
+			}
+			if b, err = os.ReadFile(c.CertFile); err != nil {
+				return
+			}
+			if parsedTlsCerts, err = ParseLeafCert(b, privKeys, intermediateCAs...); err != nil {
+				return
+			}
+			tlsCerts = append(tlsCerts, parsedTlsCerts...)
+		}
+	}
+
+	// Ciphers.
+	if t.CipherSuites != nil {
+		ciphers = ParseTlsCiphers(strings.Join(t.CipherSuites, ","))
+	}
+
+	// Minimum TLS Protocol Version.
+	if t.MinTlsProtocol != nil {
+		if minVer, err = ParseTlsVersion(*t.MinTlsProtocol); err != nil {
+			return
+		}
+	}
+
+	// Maximum TLS Protocol Version.
+	if t.MaxTlsProtocol != nil {
+		if maxVer, err = ParseTlsVersion(*t.MaxTlsProtocol); err != nil {
+			return
+		}
+	}
+
+	// Curves.
+	if t.Curves != nil {
+		curves = ParseTlsCurves(strings.Join(t.Curves, ","))
+	}
+
+	tlsConf = &tls.Config{
+		Certificates:       tlsCerts,
+		RootCAs:            rootCAs,
+		ServerName:         srvNm,
+		InsecureSkipVerify: t.SkipVerify,
+		CipherSuites:       ciphers,
+		MinVersion:         minVer,
+		MaxVersion:         maxVer,
+		CurvePreferences:   curves,
+	}
+	return
+}
+
+// ToTlsUri returns a TlsUri from a TlsFlat.
+func (t *TlsFlat) ToTlsUri() (tlsUri *TlsUri, err error) {
+
+	var u *url.URL
+
+	if u, err = url.Parse(fmt.Sprintf("tls://%v/", t.SniName)); err != nil {
+		return
+	}
+
+	// CA cert(s).
+	if t.CaFiles != nil {
+		for _, c := range t.CaFiles {
+			u.Query().Add(TlsUriParamCa, c)
+		}
+	}
+
+	// Keys and Certs.
+	if t.Certs != nil {
+		for _, c := range t.Certs {
+			u.Query().Add(TlsUriParamCert, c.CertFile)
+			if c.KeyFile != nil {
+				u.Query().Add(TlsUriParamKey, *c.KeyFile)
+			}
+		}
+	}
+
+	// Enforce the SNI hostname.
+	u.Query().Add(TlsUriParamSni, t.SniName)
+
+	// Disable Verification.
+	if t.SkipVerify {
+		u.Query().Add(TlsUriParamNoVerify, "1")
+	}
+
+	// Ciphers.
+	if t.CipherSuites != nil {
+		for _, c := range t.CipherSuites {
+			u.Query().Add(TlsUriParamCipher, c)
+		}
+	}
+
+	// Minimum TLS Protocol Version.
+	if t.MinTlsProtocol != nil {
+		u.Query().Add(TlsUriParamMinTls, *t.MinTlsProtocol)
+	}
+
+	// Maximum TLS Protocol Version.
+	if t.MaxTlsProtocol != nil {
+		u.Query().Add(TlsUriParamMaxTls, *t.MaxTlsProtocol)
+	}
+
+	// Curves.
+	if t.Curves != nil {
+		for _, c := range t.Curves {
+			u.Query().Add(TlsUriParamCurve, c)
+		}
+	}
+
+	tlsUri = &TlsUri{
+		URL: u,
+	}
+
+	return
+}