v1.4.0

ADDED: * cryptparse, which makes managing certs/keys MUCH much easier (and better) than the stdlib utilities.
2024-06-21 17:18:19 -04:00 · 2024-06-21 17:18:19 -04:00 · db20c70d86
commit db20c70d86
parent c0c924b75a
9 changed files with 1333 additions and 13 deletions
--- a/cryptparse/TODO
+++ b/cryptparse/TODO
@ -0,0 +1,3 @@
+- PKCS#12/PFX parsing/support
+
+- Move to struct tags and reflection, so it can not only be easier to maintain in the future but also be implemented in custom structs downstream.
--- a/cryptparse/consts.go
+++ b/cryptparse/consts.go
@ -0,0 +1,123 @@
+package cryptparse
+
+import (
+	`crypto/tls`
+
+	`github.com/go-playground/validator/v10`
+)
+
+var (
+	tlsVerNmToUint    map[string]uint16
+	tlsCipherNmToUint map[string]uint16
+	tlsCurveNmToCurve map[string]tls.CurveID
+)
+
+const (
+	MaxTlsCipher uint16      = tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
+	MaxCurveId   tls.CurveID = tls.X25519 // 29
+	MinTlsVer    uint16      = tls.VersionSSL30
+	MaxTlsVer    uint16      = tls.VersionTLS13
+)
+
+// TlsUriParam* specifiy URL query parameters to parse a tls:// URI.
+const (
+	/*
+		TlsUriParamCa specifies a path to a CA certificate PEM-encded DER file.
+
+		It may be specified multiple times in a TLS URI.
+	*/
+	TlsUriParamCa string = "pki_ca"
+	/*
+		TlsUriParamCert specifies a path to a client certificate PEM-encded DER file.
+
+		It may be specified multiple times in a TLS URI.
+	*/
+	TlsUriParamCert string = "pki_cert"
+	/*
+		TlsUriParamKey specifies a path to a private key as a PEM-encded file.
+
+		It may be PKCS#1, PKCS#8, or PEM-encoded ASN.1 DER EC key.
+
+		Supported private key types are RSA, ED25519, ECDSA, and ECDH.
+
+		It may be specified multiple times in a TLS URI.
+	*/
+	TlsUriParamKey string = "pki_key"
+	/*
+		TlsUriParamNoVerify, if `1`, `yes`, `y`, or `true` indicate
+		that the TLS connection should not require verification of
+		the remote end (e.g. hostname matches, trusted chain, etc.).
+
+		Any other value for this parameter will be parsed as "False"
+		(meaning the remote end's certificate SHOULD be verified).
+
+		Only the first defined instance is parsed.
+	*/
+	TlsUriParamNoVerify string = "no_verify"
+	/*
+		TlsUriParamSni indicates that the TLS connection should expect this hostname
+		instead of the hostname specified in the URI itself.
+
+		Only the first defined instance is parsed.
+	*/
+	TlsUriParamSni string = "sni"
+	/*
+		TlsUriParamCipher specifies one (or more) cipher(s)
+		to specify for the TLS connection cipher negotiation.
+		Note that TLS 1.3 has a fixed set of ciphers, and
+		this list may not be respected by the remote end.
+
+		The string may either be the name (as per
+		https://www.iana.org/assignments/tls-parameters/tls-parameters.xml)
+		or an int (normal, hex, etc. string representation).
+
+		It may be specified multiple times in a TLS URI.
+	*/
+	TlsUriParamCipher string = "cipher"
+	/*
+		TlsUriParamCurve specifies one (or more) curve(s)
+		to specify for the TLS connection cipher negotiation.
+
+		It may be specified multiple times in a TLS URI.
+	*/
+	TlsUriParamCurve string = "curve"
+	/*
+		TlsUriParamMinTls defines the minimum version of the
+		TLS protocol to use.
+		It is recommended to use "TLS_1.3".
+
+		Supported syntax formats include:
+
+			* TLS_1.3
+			* 1.3
+			* v1.3
+			* TLSv1.3
+			* 0x0304 (legacy_version, see RFC8446 § 4.1.2)
+			* 774 (0x0304 in int form)
+			* 0o1404 (0x0304 in octal form)
+
+		All evaluate to TLS 1.3 in this example.
+
+		Only the first defined instance is parsed.
+	*/
+	TlsUriParamMinTls string = "min_tls"
+	/*
+		TlsUriParamMaxTls defines the minimum version of the
+		TLS protocol to use.
+
+		See TlsUriParamMinTls for syntax of the value.
+
+		Only the first defined instance is parsed.
+	*/
+	TlsUriParamMaxTls string = "max_tls"
+)
+
+var (
+	paramBoolValsTrue []string = []string{
+		"1", "yes", "y", "true",
+	}
+	paramBoolValsFalse []string = []string{
+		"0", "no", "n", "false",
+	}
+	validate *validator.Validate = validator.New(validator.WithRequiredStructEnabled())
+)
--- a/cryptparse/errs.go
+++ b/cryptparse/errs.go
@ -0,0 +1,12 @@
+package cryptparse
+
+import (
+	`errors`
+)
+
+var (
+	ErrBadTlsCipher error = errors.New("invalid TLS cipher suite")
+	ErrBadTlsCurve  error = errors.New("invalid TLS curve")
+	ErrBadTlsVer    error = errors.New("invalid TLS version")
+	ErrUnknownKey   error = errors.New("unknown key type")
+)
--- a/cryptparse/funcs.go
+++ b/cryptparse/funcs.go
@ -0,0 +1,751 @@
+package cryptparse
+
+import (
+	`bytes`
+	`crypto`
+	`crypto/ecdh`
+	`crypto/ecdsa`
+	`crypto/ed25519`
+	`crypto/rsa`
+	`crypto/tls`
+	`crypto/x509`
+	`encoding/pem`
+	`errors`
+	`net/url`
+	`os`
+	`strconv`
+	`strings`
+
+	`r00t2.io/sysutils/paths`
+)
+
+// FromURL returns a *TlsUri from a *url.URL.
+func FromURL(u *url.URL) (t *TlsUri) {
+
+	var newU *url.URL
+
+	if u == nil {
+		return
+	}
+
+	newU = new(url.URL)
+	*newU = *u
+	if u.User != nil {
+		newU.User = new(url.Userinfo)
+		*newU.User = *u.User
+	}
+
+	newU.Scheme = "tls"
+
+	t = &TlsUri{
+		URL: newU,
+	}
+
+	return
+}
+
+// IsMatchedPair returns true if the privateKey is paired with the cert.
+func IsMatchedPair(privKey crypto.PrivateKey, cert *x509.Certificate) (isMatched bool, err error) {
+
+	var pubkey crypto.PublicKey
+
+	if cert == nil || privKey == nil {
+		return
+	}
+
+	pubkey = cert.PublicKey
+
+	switch k := privKey.(type) {
+	case *rsa.PrivateKey:
+		if p, ok := pubkey.(*rsa.PublicKey); ok {
+			isMatched = k.PublicKey.Equal(p)
+			return
+		}
+	case ed25519.PrivateKey:
+		if p, ok := pubkey.(ed25519.PublicKey); ok {
+			// Order is flipped here because unlike the other key types, an ed25519.PrivateKey is just a []byte.
+			isMatched = p.Equal(k.Public())
+			return
+		}
+	case *ecdh.PrivateKey:
+		if p, ok := pubkey.(*ecdh.PublicKey); ok {
+			isMatched = k.PublicKey().Equal(p)
+			return
+		}
+	case *ecdsa.PrivateKey:
+		if p, ok := pubkey.(*ecdsa.PublicKey); ok {
+			isMatched = k.PublicKey.Equal(p)
+			return
+		}
+	}
+
+	// If we got here, we can't determine either the private key type or the cert's public key type.
+	err = ErrUnknownKey
+
+	return
+}
+
+/*
+	ParseTlsCipher parses string s and attempts to derive a TLS cipher suite (as a uint16) from it.
+	Use ParseTlsCipherSuite if you wish for a tls.CipherSuite instead.
+
+	The string may either be the name (as per https://www.iana.org/assignments/tls-parameters/tls-parameters.xml)
+	or an int (normal, hex, etc. string representation).
+
+	If none is found, the default is MaxTlsCipher.
+*/
+func ParseTlsCipher(s string) (cipherSuite uint16, err error) {
+
+	var nm string
+	var n uint64
+	var i uint16
+	var ok bool
+
+	if n, err = strconv.ParseUint(s, 10, 16); err != nil {
+		if errors.Is(err, strconv.ErrSyntax) {
+			// It's a name; parse below.
+			err = nil
+		} else {
+			return
+		}
+	} else {
+		// It's a number.
+		if nm = tls.CipherSuiteName(uint16(n)); strings.HasPrefix(nm, "0x") {
+			// ...but invalid.
+			err = ErrBadTlsCipher
+			return
+		} else {
+			// Valid (as number). Return it.
+			cipherSuite = uint16(n)
+			return
+		}
+	}
+
+	s = strings.ToUpper(s)
+	s = strings.ReplaceAll(s, " ", "_")
+
+	// We build a dynamic map of cipher suite names to uint16s (if not already created).
+	if tlsCipherNmToUint == nil {
+		tlsCipherNmToUint = make(map[string]uint16)
+		for i = 0; i <= MaxTlsCipher; i++ {
+			if nm = tls.VersionName(i); !strings.HasPrefix(nm, "0x") {
+				tlsCipherNmToUint[nm] = i
+			}
+		}
+	}
+
+	cipherSuite = MaxTlsCipher
+	if i, ok = tlsCipherNmToUint[s]; ok {
+		cipherSuite = i
+	}
+
+	return
+}
+
+/*
+	ParseTlsCiphers parses s as a comma-separated list of cipher suite names/integers and returns a slice of suites.
+
+	See ParseTlsCipher for details, as this is mostly just a wrapper around it.
+
+	If no cipher suites are found, cipherSuites will only contain MaxTlsCipher.
+*/
+func ParseTlsCiphers(s string) (cipherSuites []uint16) {
+
+	var suiteNms []string
+	var cipher uint16
+	var err error
+
+	suiteNms = strings.Split(s, ",")
+	cipherSuites = make([]uint16, 0, len(suiteNms))
+
+	for _, nm := range suiteNms {
+		if cipher, err = ParseTlsCipher(nm); err != nil {
+			err = nil
+			continue
+		}
+		cipherSuites = append(cipherSuites, cipher)
+	}
+
+	if len(cipherSuites) == 0 {
+		cipherSuites = []uint16{tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256}
+	}
+
+	return
+}
+
+// ParseTlsCipherSuite is like ParseTlsCipher but returns a *tls.CipherSuite instead of a uint16 TLS cipher identifier.
+func ParseTlsCipherSuite(s string) (cipherSuite *tls.CipherSuite, err error) {
+
+	var cipherId uint16
+
+	if cipherId, err = ParseTlsCipher(s); err != nil {
+		return
+	}
+
+	for _, v := range tls.CipherSuites() {
+		if v.ID == cipherId {
+			cipherSuite = v
+			return
+		}
+	}
+	for _, v := range tls.InsecureCipherSuites() {
+		if v.ID == cipherId {
+			cipherSuite = v
+			return
+		}
+	}
+
+	return
+}
+
+// ParseTlsCipherSuites is like ParseTlsCiphers but returns a []*tls.CipherSuite instead of a []uint16 of TLS cipher identifiers.
+func ParseTlsCipherSuites(s string) (cipherSuites []*tls.CipherSuite, err error) {
+
+	var found bool
+	var cipherIds []uint16
+
+	cipherIds = ParseTlsCiphers(s)
+
+	for _, cipherId := range cipherIds {
+		found = false
+		for _, v := range tls.CipherSuites() {
+			if v.ID == cipherId {
+				cipherSuites = append(cipherSuites, v)
+				found = true
+				break
+			}
+		}
+		if !found {
+			for _, v := range tls.InsecureCipherSuites() {
+				if v.ID == cipherId {
+					cipherSuites = append(cipherSuites, v)
+					break
+				}
+			}
+		}
+	}
+
+	return
+}
+
+/*
+	ParseTlsCurve parses string s and attempts to derive a tls.CurveID from it.
+
+	The string may either be the name (as per // https://www.iana.org/assignments/tls-parameters/tls-parameters.xml#tls-parameters-8)
+	or an int (normal, hex, etc. string representation).
+*/
+func ParseTlsCurve(s string) (curve tls.CurveID, err error) {
+
+	var i tls.CurveID
+	var n uint64
+	var ok bool
+
+	if n, err = strconv.ParseUint(s, 10, 16); err != nil {
+		if errors.Is(err, strconv.ErrSyntax) {
+			// It's a name; parse below.
+			err = nil
+		} else {
+			return
+		}
+	} else {
+		// It's a number.
+		if strings.HasPrefix(tls.CurveID(uint16(n)).String(), "CurveID(") {
+			// ...but invalid.
+			err = ErrBadTlsCurve
+			return
+		} else {
+			// Valid (as number). Return it.
+			curve = tls.CurveID(uint16(n))
+			return
+		}
+	}
+
+	// It seems to be a name. Normalize...
+	s = strings.ToUpper(s)
+
+	// Unfortunately there's no "tls.CurveIDName()" function.
+	// They do have a .String() method though.
+	if tlsCurveNmToCurve == nil {
+		tlsCurveNmToCurve = make(map[string]tls.CurveID)
+		for i = 0; i <= MaxCurveId; i++ {
+			if strings.HasPrefix(i.String(), "CurveID(") {
+				continue
+			}
+			tlsCurveNmToCurve[i.String()] = i
+			// It's normally mixed-case; we want to be able to look it up in a normalized all-caps as well.
+			tlsCurveNmToCurve[strings.ToUpper(i.String())] = i
+			// The normal name, except for X25519, has "Curve" in the front. We add it without that prefix as well.
+			tlsCurveNmToCurve[strings.TrimPrefix(i.String(), "Curve")] = i
+		}
+	}
+
+	curve = MaxCurveId
+	if _, ok = tlsCurveNmToCurve[s]; ok {
+		curve = tlsCurveNmToCurve[s]
+	}
+
+	return
+}
+
+/*
+	ParseTlsCurves parses s as a comma-separated list of tls.CurveID names/integers and returns a slice of tls.CurveID.
+
+	See ParseTlsCurve for details, as this is mostly just a wrapper around it.
+
+	If no curves are found, curves will only contain MaxCurveId.
+*/
+func ParseTlsCurves(s string) (curves []tls.CurveID) {
+
+	var curveNms []string
+	var curve tls.CurveID
+	var err error
+
+	curveNms = strings.Split(s, ",")
+	curves = make([]tls.CurveID, 0, len(curveNms))
+
+	for _, nm := range curveNms {
+		if curve, err = ParseTlsCurve(nm); err != nil {
+			err = nil
+			continue
+		}
+		curves = append(curves, curve)
+	}
+
+	if len(curves) == 0 {
+		curves = []tls.CurveID{MaxCurveId}
+	}
+
+	return
+}
+
+/*
+	ParseTlsUri parses a "TLS URI"'s query parameters. All certs and keys must be in PEM format.
+
+	You probably don't need this and should instead be using TlsUri.ToTlsConfig.
+	It just wraps this, but is probably more convenient.
+*/
+func ParseTlsUri(tlsUri *url.URL) (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 allowInvalid bool
+	var ciphers []uint16
+	var curves []tls.CurveID
+	var params map[string][]string
+	var ok bool
+	var val string
+	var minVer uint16
+	var maxVer uint16
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var srvNm string = tlsUri.Hostname()
+
+	params = tlsUri.Query()
+
+	if params == nil {
+		tlsConf = &tls.Config{
+			ServerName: srvNm,
+		}
+		return
+	}
+
+	// These are all filepath(s).
+	for _, k := range []string{
+		TlsUriParamCa,
+		TlsUriParamCert,
+		TlsUriParamKey,
+	} {
+		if _, ok = params[k]; ok {
+			for idx, _ := range params[k] {
+				if err = paths.RealPath(&params[k][idx]); err != nil {
+					return
+				}
+			}
+		}
+	}
+
+	// CA cert(s).
+	buf.Reset()
+	if _, ok = params[TlsUriParamCa]; ok {
+		rootCAs = x509.NewCertPool()
+		for _, c := range params[TlsUriParamCa] {
+			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. These are done first so we can match to a client certificate.
+	buf.Reset()
+	if _, ok = params[TlsUriParamKey]; ok {
+		for _, k := range params[TlsUriParamKey] {
+			if b, err = os.ReadFile(k); err != nil {
+				if errors.Is(err, os.ErrNotExist) {
+					err = nil
+					continue
+				} else {
+					return
+				}
+			}
+			buf.Write(b)
+		}
+		if privKeys, err = ParsePrivateKey(buf.Bytes()); err != nil {
+			return
+		}
+	}
+
+	// (Client) Certificate(s).
+	buf.Reset()
+	if _, ok = params[TlsUriParamCert]; ok {
+		for _, c := range params[TlsUriParamCert] {
+			if b, err = os.ReadFile(c); err != nil {
+				if errors.Is(err, os.ErrNotExist) {
+					err = nil
+					continue
+				} else {
+					return
+				}
+			}
+			buf.Write(b)
+		}
+		if tlsCerts, err = ParseLeafCert(buf.Bytes(), privKeys, intermediateCAs...); err != nil {
+			return
+		}
+	}
+
+	// Hostname (Override).
+	if _, ok = params[TlsUriParamSni]; ok {
+		srvNm = params[TlsUriParamSni][0]
+	}
+
+	// Disable Verification.
+	if _, ok = params[TlsUriParamNoVerify]; ok {
+		val = strings.ToLower(params[TlsUriParamNoVerify][0])
+		for _, i := range paramBoolValsTrue {
+			if i == val {
+				allowInvalid = true
+				break
+			}
+		}
+	}
+
+	// Ciphers.
+	if _, ok = params[TlsUriParamCipher]; ok {
+		ciphers = ParseTlsCiphers(strings.Join(params[TlsUriParamCipher], ","))
+	}
+
+	// Minimum TLS Protocol Version.
+	if _, ok = params[TlsUriParamMinTls]; ok {
+		if minVer, err = ParseTlsVersion(params[TlsUriParamMinTls][0]); err != nil {
+			return
+		}
+	}
+
+	// Maximum TLS Protocol Version.
+	if _, ok = params[TlsUriParamMaxTls]; ok {
+		if maxVer, err = ParseTlsVersion(params[TlsUriParamMaxTls][0]); err != nil {
+			return
+		}
+	}
+
+	// Curves.
+	if _, ok = params[TlsUriParamCurve]; ok {
+		curves = ParseTlsCurves(strings.Join(params[TlsUriParamCurve], ","))
+	}
+
+	tlsConf = &tls.Config{
+		Certificates:       tlsCerts,
+		RootCAs:            rootCAs,
+		ServerName:         srvNm,
+		InsecureSkipVerify: allowInvalid,
+		CipherSuites:       ciphers,
+		MinVersion:         minVer,
+		MaxVersion:         maxVer,
+		CurvePreferences:   curves,
+	}
+
+	return
+}
+
+// ParseTlsVersion parses string s and attempts to derive a TLS version from it. If none is found, tlsVer will be 0.
+func ParseTlsVersion(s string) (tlsVer uint16, err error) {
+
+	var nm string
+	var n uint64
+	var i uint16
+	var ok bool
+
+	if n, err = strconv.ParseUint(s, 10, 16); err != nil {
+		if errors.Is(err, strconv.ErrSyntax) {
+			// It's a name; parse below.
+			err = nil
+		} else {
+			return
+		}
+	} else {
+		// It's a number.
+		if nm = tls.VersionName(uint16(n)); strings.HasPrefix(nm, "0x") {
+			// ...but invalid.
+			err = ErrBadTlsVer
+			return
+		} else {
+			// Valid (as number). Return it.
+			tlsVer = uint16(n)
+			return
+		}
+	}
+
+	// If we get here, it should be parsed as a version string.
+	s = strings.ToUpper(s)
+	s = strings.ReplaceAll(s, "_", " ")
+	s = strings.ReplaceAll(s, "V", " ")
+	s = strings.TrimSpace(s)
+	if !strings.HasPrefix(s, "SSL") && !strings.HasPrefix(s, "TLS ") {
+		s = "TLS " + s
+	}
+
+	// We build a dynamic map of version names to uint16s (if not already created).
+	if tlsVerNmToUint == nil {
+		tlsVerNmToUint = make(map[string]uint16)
+		for i = MinTlsVer; i <= MaxTlsVer; i++ {
+			if nm = tls.VersionName(i); !strings.HasPrefix(nm, "0x") {
+				tlsVerNmToUint[nm] = i
+			}
+		}
+	}
+
+	if i, ok = tlsVerNmToUint[s]; ok {
+		tlsVer = i
+	}
+
+	return
+}
+
+/*
+	ParseCA parses PEM bytes and returns an *x509.CertPool in caCerts.
+
+	Concatenated PEM files are supported.
+
+	Any keys found will be filtered out, as will any leaf certificates.
+
+	Any *intermediate* CAs (the certificate is a CA but it is not self-signed) will be returned separate from
+	certPool.
+
+	Ordering from the file is preserved in the returned slices.
+*/
+func ParseCA(certRaw []byte) (certPool *x509.CertPool, rootCerts []*x509.Certificate, intermediateCerts []*x509.Certificate, err error) {
+
+	var pemBlocks []*pem.Block
+	var cert *x509.Certificate
+	var certs []*x509.Certificate
+
+	if pemBlocks, err = SplitPem(certRaw); err != nil {
+		return
+	}
+
+	// Filter out keys etc. and non-CA certs.
+	for _, b := range pemBlocks {
+		if b.Type != "CERTIFICATE" {
+			continue
+		}
+		if cert, err = x509.ParseCertificate(b.Bytes); err != nil {
+			return
+		}
+		if !cert.IsCA {
+			continue
+		}
+		certs = append(certs, cert)
+	}
+
+	for _, cert = range certs {
+		if bytes.Equal(cert.RawIssuer, cert.RawSubject) {
+			// It's a root/self-signed.
+			rootCerts = append(rootCerts, cert)
+		} else {
+			// It's an intermediate.
+			intermediateCerts = append(intermediateCerts, cert)
+		}
+	}
+
+	if rootCerts != nil {
+		certPool = x509.NewCertPool()
+		for _, cert = range rootCerts {
+			certPool.AddCert(cert)
+		}
+	}
+
+	return
+}
+
+/*
+	ParseLeafCert parses PEM bytes from a (client) certificate file, iterates over a slice of
+	crypto.PrivateKey (finding one that matches), and returns one (or more) tls.Certificate.
+
+	The key may also be combined with the certificate in the same file.
+
+	If no private key matches or no client cert is found in the file, tlsCerts will be nil/missing
+	that certificate but no error will be returned.
+	This behavior can be avoided by passing a nil slice to keys.
+
+	Any leaf certificates ("server" certificate, as opposed to a signer/issuer) found in the file
+	will be assumed to be the desired one(s).
+
+	Any additional/supplementary intermediates may be provided. Any present in the PEM bytes (certRaw) will be included.
+
+	Any *root* CAs found will be discarded. They should/can be extracted seperately via ParseCA.
+
+	The parsed and paired certificates and keys can be found in each respective tls.Certificate.Leaf and tls.Certificate.PrivateKey.
+	Any certs without a corresponding key will be discarded.
+*/
+func ParseLeafCert(certRaw []byte, keys []crypto.PrivateKey, intermediates ...*x509.Certificate) (tlsCerts []tls.Certificate, err error) {
+
+	var pemBlocks []*pem.Block
+	var cert *x509.Certificate
+	var certs []*x509.Certificate
+	var caCerts []*x509.Certificate
+	var parsedKeys []crypto.PrivateKey
+	var isMatched bool
+	var foundKey crypto.PrivateKey
+	var interBytes [][]byte
+	var skipKeyPair bool = keys == nil
+	var parsedKeysBuf *bytes.Buffer = new(bytes.Buffer)
+
+	if pemBlocks, err = SplitPem(certRaw); err != nil {
+		return
+	}
+
+	for _, b := range pemBlocks {
+		if strings.Contains(b.Type, "PRIVATE KEY") {
+			parsedKeysBuf.Write(pem.EncodeToMemory(b))
+			continue
+		}
+		if b.Type != "CERTIFICATE" {
+			continue
+		}
+		if cert, err = x509.ParseCertificate(b.Bytes); err != nil {
+			return
+		}
+		if cert.IsCA {
+			if bytes.Equal(cert.RawIssuer, cert.RawSubject) {
+				caCerts = append(caCerts, cert)
+			} else {
+				intermediates = append(intermediates, cert)
+			}
+		}
+		certs = append(certs, cert)
+	}
+
+	if intermediates != nil && len(intermediates) != 0 {
+		interBytes = make([][]byte, len(intermediates))
+		for _, i := range intermediates {
+			interBytes = append(interBytes, i.Raw)
+		}
+	}
+
+	if parsedKeysBuf.Len() != 0 {
+		if parsedKeys, err = ParsePrivateKey(parsedKeysBuf.Bytes()); err != nil {
+			return
+		}
+		keys = append(keys, parsedKeys...)
+	}
+
+	// Now pair the certs and keys, and combine as a tls.Certificate.
+	for _, cert = range certs {
+		foundKey = nil
+		for _, k := range keys {
+			if isMatched, err = IsMatchedPair(k, cert); err != nil {
+				return
+			}
+			if isMatched {
+				foundKey = k
+				break
+			}
+		}
+		if foundKey == nil && !skipKeyPair {
+			continue
+		}
+		tlsCerts = append(
+			tlsCerts,
+			tls.Certificate{
+				Certificate: append([][]byte{cert.Raw}, interBytes...),
+				PrivateKey:  foundKey,
+				Leaf:        cert,
+			},
+		)
+	}
+
+	_ = caCerts
+
+	return
+}
+
+/*
+	ParsePrivateKey parses PEM bytes to a private key. Multiple keys may be concatenated in the same file.
+
+	Any public keys, certificates, etc. found will be discarded.
+*/
+func ParsePrivateKey(keyRaw []byte) (keys []crypto.PrivateKey, err error) {
+
+	var privKey crypto.PrivateKey
+	var pemBlocks []*pem.Block
+
+	if pemBlocks, err = SplitPem(keyRaw); err != nil {
+		return
+	}
+
+	for _, b := range pemBlocks {
+		if !strings.Contains(b.Type, "PRIVATE KEY") {
+			continue
+		}
+		switch b.Type {
+		case "RSA PRIVATE KEY": // PKCS#1
+			if privKey, err = x509.ParsePKCS1PrivateKey(b.Bytes); err != nil {
+				return
+			}
+			keys = append(keys, privKey)
+		case "EC PRIVATE KEY": // SEC 1, ASN.1 DER
+			if privKey, err = x509.ParseECPrivateKey(b.Bytes); err != nil {
+				return
+			}
+			keys = append(keys, privKey)
+		case "PRIVATE KEY": // PKCS#8
+			if privKey, err = x509.ParsePKCS8PrivateKey(b.Bytes); err != nil {
+				return
+			}
+			keys = append(keys, privKey)
+		default:
+			err = ErrUnknownKey
+			return
+		}
+	}
+
+	// TODO
+
+	return
+}
+
+// SplitPem splits a single block of bytes into one (or more) (encoding/)pem.Blocks.
+func SplitPem(pemRaw []byte) (blocks []*pem.Block, err error) {
+
+	var block *pem.Block
+	var rest []byte
+
+	for block, rest = pem.Decode(pemRaw); block != nil; block, rest = pem.Decode(rest) {
+		blocks = append(blocks, block)
+	}
+
+	return
+}
--- a/cryptparse/funcs_tlsflat.go
+++ b/cryptparse/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
+}
--- a/cryptparse/funcs_tlsuri.go
+++ b/cryptparse/funcs_tlsuri.go
@ -0,0 +1,159 @@
+package cryptparse
+
+import (
+	`crypto`
+	`crypto/tls`
+	`net/url`
+	`os`
+	`strings`
+)
+
+/*
+	ToTlsConfig returns a *tls.Config from a TlsUri.
+
+	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 *TlsUri) ToTlsConfig() (cfg *tls.Config, err error) {
+
+	if cfg, err = ParseTlsUri(t.URL); err != nil {
+		return
+	}
+
+	return
+}
+
+// ToTlsFlat returns a *TlsFlat from a TlsUri.
+func (t *TlsUri) ToTlsFlat() (tlsFlat *TlsFlat, err error) {
+
+	var b []byte
+	var params url.Values
+	var paramMap map[string][]string
+	// These also have maps so they can backmap filenames.
+	var privKeys []crypto.PrivateKey
+	var privKeyMap map[string][]crypto.PrivateKey
+	var tlsCerts []tls.Certificate
+	var tlsCertMap map[string][]tls.Certificate
+	var isMatch bool
+	var fCert *TlsFlatCert
+	var val string
+	var f TlsFlat = TlsFlat{
+		SniName:        t.Hostname(),
+		SkipVerify:     false,
+		Certs:          nil,
+		CaFiles:        nil,
+		CipherSuites:   nil,
+		MinTlsProtocol: nil,
+		MaxTlsProtocol: nil,
+		Curves:         nil,
+	}
+
+	params = t.Query()
+	paramMap = params
+
+	if params == nil {
+		tlsFlat = &f
+		return
+	}
+
+	// CA cert(s).
+	if t.Query().Has(TlsUriParamCa) {
+		f.CaFiles = append(f.CaFiles, paramMap[TlsUriParamCa]...)
+	}
+
+	// Keys and Certs. These are done first so we can match to a client certificate.
+	if t.Query().Has(TlsUriParamKey) {
+		privKeyMap = make(map[string][]crypto.PrivateKey)
+		for _, kFile := range paramMap[TlsUriParamKey] {
+			if b, err = os.ReadFile(kFile); err != nil {
+				return
+			}
+			if privKeyMap[kFile], err = ParsePrivateKey(b); err != nil {
+				return
+			}
+			privKeys = append(privKeys, privKeyMap[kFile]...)
+		}
+	}
+	if t.Query().Has(TlsUriParamCert) {
+		tlsCertMap = make(map[string][]tls.Certificate)
+		for _, cFile := range paramMap[TlsUriParamCert] {
+			if b, err = os.ReadFile(cFile); err != nil {
+				return
+			}
+			if tlsCertMap[cFile], err = ParseLeafCert(b, privKeys); err != nil {
+				return
+			}
+			tlsCerts = append(tlsCerts, tlsCertMap[cFile]...)
+		}
+	}
+	// We then correlate. Whew, lads.
+	for cFile, c := range tlsCertMap {
+		for _, cert := range c {
+			for kFile, k := range privKeyMap {
+				if isMatch, err = IsMatchedPair(k, cert.Leaf); err != nil {
+					return
+				} else if isMatch {
+					fCert = &TlsFlatCert{
+						CertFile: cFile,
+						KeyFile:  new(string),
+					}
+					*fCert.KeyFile = kFile
+					f.Certs = append(f.Certs, fCert)
+				}
+			}
+		}
+	}
+
+	// Hostname.
+	if t.Query().Has(TlsUriParamSni) {
+		f.SniName = t.Query().Get(TlsUriParamSni)
+	}
+
+	// Disable verification.
+	if t.Query().Has(TlsUriParamNoVerify) {
+		val = strings.ToLower(t.Query().Get(TlsUriParamNoVerify))
+		for _, i := range paramBoolValsTrue {
+			if val == i {
+				f.SkipVerify = true
+				break
+			}
+		}
+	}
+
+	// Ciphers.
+	if t.Query().Has(TlsUriParamCipher) {
+		f.CipherSuites = params[TlsUriParamCipher]
+	}
+
+	// Minimum TLS Protocol Version.
+	if t.Query().Has(TlsUriParamMinTls) {
+		f.MinTlsProtocol = new(string)
+		*f.MinTlsProtocol = t.Query().Get(TlsUriParamMinTls)
+	}
+
+	// Maximum TLS Protocol Version.
+	if t.Query().Has(TlsUriParamMaxTls) {
+		f.MaxTlsProtocol = new(string)
+		*f.MaxTlsProtocol = t.Query().Get(TlsUriParamMaxTls)
+	}
+
+	// Curves.
+	if t.Query().Has(TlsUriParamCurve) {
+		f.Curves = params[TlsUriParamCurve]
+	}
+
+	tlsFlat = &f
+
+	return
+}
+
+// ToURL returns the *url.URL representation of a TlsUri.
+func (t *TlsUri) ToURL() (u *url.URL) {
+
+	if t == nil {
+		return
+	}
+
+	u = t.URL
+
+	return
+}
--- a/cryptparse/types.go
+++ b/cryptparse/types.go
@ -0,0 +1,30 @@
+package cryptparse
+
+import (
+	`encoding/xml`
+	`net/url`
+)
+
+// TlsFlat provides an easy structure to marshal/unmarshal a tls.Config from/to a data structure (JSON, XML, etc.).
+type TlsFlat struct {
+	XMLName        xml.Name       `xml:"tlsConfig" json:"-" yaml:"-" toml:"-"`
+	SniName        string         `json:"sni_name" xml:"sniName,attr" yaml:"SniName" toml:"SniName" required:"true" validate:"required"`
+	SkipVerify     bool           `json:"skip_verify,omitempty" xml:"skipVerify,attr,omitempty" yaml:"SkipVerify,omitempty" toml:"SkipVerify,omitempty"`
+	Certs          []*TlsFlatCert `json:"certs,omitempty" xml:"certs>cert,omitempty" yaml:"Certs,omitempty" toml:"Certs,omitempty" validate:"omitempty,dive"`
+	CaFiles        []string       `json:"ca_files,omitempty" xml:"roots>ca,omitempty" yaml:"CaFiles,omitempty" toml:"CaFiles,omitempty" validate:"omitempty,dive,filepath"`
+	CipherSuites   []string       `json:"cipher_suites,omitempty" xml:"ciphers,omitempty" yaml:"CipherSuites,omitempty" toml:"CipherSuites,omitempty"`
+	MinTlsProtocol *string        `json:"min_tls_protocol,omitempty" xml:"minTlsProtocol,attr,omitempty" yaml:"MinTlsProtocol,omitempty" toml:"MinTlsProtocol,omitempty"`
+	MaxTlsProtocol *string        `json:"max_tls_protocol,omitempty" xml:"maxTlsProtocol,attr,omitempty" yaml:"MaxTlsProtocol,omitempty" toml:"MaxTlsProtocol,omitempty"`
+	Curves         []string       `json:"curves,omitempty" xml:"curves>curve,omitempty" yaml:"Curves,omitempty" toml:"Curves,omitempty" validate:"omitempty,dive"`
+}
+
+// TlsFlatCert represents a certificate (and, possibly, paired key).
+type TlsFlatCert struct {
+	XMLName  xml.Name `xml:"cert" json:"-" yaml:"-" toml:"-"`
+	KeyFile  *string  `json:"key,omitempty" xml:"key,attr,omitempty" yaml:"Key,omitempty" toml:"Key,omitempty" validate:"omitempty,filepath"`
+	CertFile string   `json:"cert" xml:",chardata" yaml:"Certificate" toml:"Certificate" required:"true" validate:"required,filepath"`
+}
+
+type TlsUri struct {
+	*url.URL
+}
--- a/go.mod
+++ b/go.mod
@ -5,14 +5,21 @@ go 1.21
 require (
 	github.com/davecgh/go-spew v1.1.1
 	github.com/g0rbe/go-chattr v1.0.1
-	github.com/google/uuid v1.6.0
+	github.com/go-playground/validator/v10 v10.22.0
+	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
 	golang.org/x/sys v0.19.0
+	honnef.co/go/augeas v0.0.0-20161110001225-ca62e35ed6b8
 	r00t2.io/goutils v1.6.0
 )

 require (
-	github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf // indirect
-	github.com/godbus/dbus v4.1.0+incompatible // indirect
+	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	golang.org/x/crypto v0.19.0 // indirect
+	golang.org/x/net v0.21.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
 )

 // Pending https://github.com/g0rbe/go-chattr/pull/3
--- a/go.sum
+++ b/go.sum
@ -1,22 +1,40 @@
-github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf h1:iW4rZ826su+pqaw19uhpSCzhj44qo35pNgKFGqzDKkU=
 github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/godbus/dbus v4.1.0+incompatible h1:WqqLRTsQic3apZUK9qC5sGNfXthmPXzUZ7nQPrNITa4=
-github.com/godbus/dbus v4.1.0+incompatible/go.mod h1:/YcGZj5zSblfDWMMoOzV4fas9FZnQYTkDnsGvmh2Grw=
-github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
+github.com/gabriel-vasile/mimetype v1.4.3/go.mod h1:d8uq/6HKRL6CGdk+aubisF/M5GcPfT7nKyLpA0lbSSk=
+github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
+github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
+github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
+github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
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