Maint: internal/openvpn/parse package

- Parse PEM key data for Cyberghost and VPNUnlimited
- Add more unit tests

internal/configuration/cyberghost.go

@@ -38,12 +38,12 @@ func (settings *Provider) readCyberghost(r reader) (err error) {
 func (settings *OpenVPN) readCyberghost(r reader) (err error) {
 	settings.ClientKey, err = readClientKey(r)
 	if err != nil {
-		return err
+		return fmt.Errorf("%w: %s", errClientKey, err)
 	}
 
 	settings.ClientCrt, err = readClientCertificate(r)
 	if err != nil {
-		return err
+		return fmt.Errorf("%w: %s", errClientCert, err)
 	}
 
 	return nil

internal/configuration/keys.go

@@ -1,11 +1,15 @@
 package configuration
 
 import (
-	"encoding/pem"
 	"errors"
-	"strings"
 
 	"github.com/qdm12/gluetun/internal/constants"
+	"github.com/qdm12/gluetun/internal/openvpn/parse"
+)
+
+var (
+	errClientCert = errors.New("cannot read client certificate")
+	errClientKey  = errors.New("cannot read client key")
 )
 
 func readClientKey(r reader) (clientKey string, err error) {
@@ -13,22 +17,7 @@ func readClientKey(r reader) (clientKey string, err error) {
 	if err != nil {
 		return "", err
 	}
-	return extractClientKey(b)
+	return parse.ExtractPrivateKey(b)
-}
-
-var errDecodePEMBlockClientKey = errors.New("cannot decode PEM block from client key")
-
-func extractClientKey(b []byte) (key string, err error) {
-	pemBlock, _ := pem.Decode(b)
-	if pemBlock == nil {
-		return "", errDecodePEMBlockClientKey
-	}
-	parsedBytes := pem.EncodeToMemory(pemBlock)
-	s := string(parsedBytes)
-	s = strings.ReplaceAll(s, "\n", "")
-	s = strings.TrimPrefix(s, "-----BEGIN PRIVATE KEY-----")
-	s = strings.TrimSuffix(s, "-----END PRIVATE KEY-----")
-	return s, nil
 }
 
 func readClientCertificate(r reader) (clientCertificate string, err error) {
@@ -36,20 +25,5 @@ func readClientCertificate(r reader) (clientCertificate string, err error) {
 	if err != nil {
 		return "", err
 	}
-	return extractClientCertificate(b)
+	return parse.ExtractCert(b)
-}
-
-var errDecodePEMBlockClientCert = errors.New("cannot decode PEM block from client certificate")
-
-func extractClientCertificate(b []byte) (certificate string, err error) {
-	pemBlock, _ := pem.Decode(b)
-	if pemBlock == nil {
-		return "", errDecodePEMBlockClientCert
-	}
-	parsedBytes := pem.EncodeToMemory(pemBlock)
-	s := string(parsedBytes)
-	s = strings.ReplaceAll(s, "\n", "")
-	s = strings.TrimPrefix(s, "-----BEGIN CERTIFICATE-----")
-	s = strings.TrimSuffix(s, "-----END CERTIFICATE-----")
-	return s, nil
 }

internal/configuration/keys_test.go

@@ -1,174 +0,0 @@
-package configuration
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func Test_extractClientKey(t *testing.T) {
-	t.Parallel()
-	const validPEM = `
------BEGIN PRIVATE KEY-----
-MIIJQwIBADANBgkqhkiG9w0BAQEFAASCCS0wggkpAgEAAoICAQCrQDrezCptkWxX
-ywm3KdXtvti+rPF3vfzOmXRKiKXDMpMxzoiaD5Wspirxxjr4C+B14xTwZjJZfxJL
-2HpPdOeBmA5tmAoGUESspnzxR/N1T4Uggx0vlAzFo0UZ0sutV6CJK19Kk38REwlG
-AB8gl6JYeSUuu6qREjrLVwFRH72acvC/p4jBki/MjAfEaeHc0yDJT9jpjpchw+Hx
-Ymy+1BnfNTAfGDdTVx9qWb+ByQ7xfvzuD9AOeqiWApDzZIuDDsaWn2orv+syoJVo
-rV52/F+75zks6+fzQ+0sotBlRyvsZKGi80F89RIHwG+5LNSuRDWnVvrwv1oc6V2/
-lMidwT7yb0kXt0IRW6JzbaHyB2LkPazBlr6IPNupk83x9t2Buw0HI2SQKHMKOChU
-i2/906yLUOo3QpAi3Wk1c/Xu9DvGR/pOA15WCakiAfG3Fq6hUxNncmpOMeOLF/ez
-L19jZ3KA4E2Te4+GA0NYlXgkDbsIILWapHwqHXcDukynHisr7RawjrvXoLyasm4L
-O66aNXK9wtipSMDA7tdlQP6Xe9bHflDHxwreiuEGxnrsvLU7LHBWdD7UT2/u8zdr
-pimqi4L7W5p5aOBMn8jSVCO9+4CAxiLlc2qx5vb4/EPMsdQfacYP7vY9iVh/qPi3
-bcUVGUlg8wAJDrTksxU1K3FVR7BEPwIDAQABAoICAAhyrbTJ+5nWH7MhCASqIqyM
-yqJ1Y6AVlkAW397BaPP9Lbe6SZDYDfkrZVjx/3y3EUafgivtzrQNibiGIFqFGNqS
-xrtvUadIFGsz91vrwb3aw2V8MldjhVHGoSUJ+hQ+C2RY6GWEazNLbhyu6tovwMl+
-iHAKv/pSHOZlD2KSH0dcPjYmLJ/n90Wu7r8ovgSnwalMsBWtfBUlVaMTyOuNCQ2y
-0QHnrusElD8p2EGtynftXMrdqtTcBi8IR2BKaHt5oiBSEum/mPmxZE16p/tUreBW
-IsLtjE663htimMc2QJtzx2mDeIqSiGYrfxdyd7d1E/SCXPS9a9ObS42k6FSn8NPu
-K5kN6fPV5EDM2CqKEt9QZPlyrjZIuffOZtJj0xPuTwhRle4SOtyjn2c/vsv9Fkrp
-B6B1v7T4+SSOIedOYkL+FP/IexMNG/ZTB5Y2hrZ03JW9RGpFAa4//qGG2qUCR3hE
-rVS6v58qO/3+TCFSn/TI8AfcTcJbes3yTbVyLH6NAjATfYqJDJJFf+PG0qKc8q1N
-KvXmT+x4JiBBM32cOg11GPflxIZSKi9He50hnPGnC042N06ba/pkUPG49XwE37hn
-kIGmcFGcDIMDTEZnPBogPFqGpepYdwGWxbadRiUoX2wgurHRRmA0YM32MjVky9C1
-12Q/Jy9PIk/qdjYdWfAhAoIBAQDcvxfUx7MKMFgYYm4E51X+7B9QoxdhVaxcoVgK
-VwfvedsLi0Bk1B1JVSXqnNfyDZbpxFz2v5Xd/dSit2rjnfBm+DoJYN9ZNnrbIH+s
-qsO1DuHZvMZlRDJbpt7PpVH/pcf7rEWRY+avkMMsiGwI/ruDs17eu7jULeG7N4jb
-kh1mdvF7K56O6Xe8jGJu5qaOPRWOkABK1cEOjQ5hB1iAwO/ua5hehP87SvbYzIhz
-nQTE3AqTWgWbIyC4R85U7tS9hsXnSQ/ICM9pWcyN0Y667LwR2tX0QKl5M/YoM0sG
-mw+VQED8O2R45jTzSAcox77dRg55Pp3Xexsp2iVvaTIeAaevAoIBAQDGmZS1gFO4
-TEgQXHdmibLizDUHLuw662GC+3Hilx+nZBZtWOc6t8yquUyggSKQmBDiKAf0ipMe
-xFao+5I3StJJ2P4Vel95Vcu8KgqCF736Q1iNgDHuW8ho8e0y+YE371x5co3POGC0
-SfbcnRTXQx2+wWXzZDh+KtnaDUyDN12/qCIUyAuSVLwEM28ZFM3qadG1aUdCB5oe
-o8jfgsg6YSukm4uE/tuI3/wAI7FkaCqvt/zkLauRff5FcNa7os4EKtNnGfebxscP
-yFYpMsW9VI0rfmYz02gho33lnofs4o8x/gxh6t5zfVbsZ7vUiSDJBahWboG9aE99
-OY2TKb6ibsBxAoIBAQChDBVR2oPnqg+Lcrw7fZ8Cxbeu992F2KBQUDHQEWCruSYy
-zNwk84+OQb3Q5a6yXHG+iNEd//ZRp+8q60/jUgXiybRlxTQNfS6ykYo0Kb1wabQi
-S5Qeq1tl/F9P9JfXQFafaTaz9MOHUMDjy3+uLFIXqpRLQX995R9rm/+P2ZDzgVF5
-///E2dXOTElACax3117TzIE6F6qqeASGi3ppLNmfAwZ95t/inTVsRARE/MhO6w4Y
-JLQ0U7N6XoDM/BVfVGUr8OS/lpXjkW0oBjvwaehnylUPxuEdmOg8ufdBkX0T8XW3
-z4jkn2cAGouGl/vKqWLD2AgF/j16Ejn/hyrWM3TnAoIBAA6lSssrwIDJ11KljwSX
-yQJirtJtymv56cIACwD7xhDRF7pOoRa6cTRx383CWCszm6Mh8pw9D+Zn8kAZ9Ulw
-khtyDiLFWH8ZLaIds5Kub4siJkihGI2MZTYgCS8GKVpXo4ktQnnynWcOQU85okzR
-nULw/jS5wlTDkjc7XdYbYiV9H65KplfPOeJRbLL7zsensBhhwCiFaP8zct/QxDVR
-7yb/dYWESepJIktcVnuiFuvIdLTbDVj4YqT6UkuaEPlLszVaO+FYAlwOmRQGs4Bn
-2NVJR/4wa/B3HxSs4Tc96fN02bLq4CbCKoPajoZ46lsIuMZO9fBi3eHNObyNiopu
-AnECggEBAJiJ0tK/PGh+Q9uv57Z4QcmbawoxMQW1qK/rLYwacYsSpzo8VhbZf+Jh
-8biMg9AIQsLWnqmB3gmndePArGXkSxnilRozNLaeclTZy7rh00BctTEfgee4Kxdi
-JKkJlVK0CE8I6txVRqkoOMyxsk1kRZ4l2yW2nxzyWlJKwvD75x2PQ6xWvpLAggyn
-q00I3MzNIgR123jytN1NyC7l+mnGoC23ToXM7B3/PQjGYTq3jawKomrX1cmwzKBT
-+pzjtJSWvMeUEZQS1PpOhxpPBRHagdKXt+ug2DqDtU6rfpDGtTBh5QNkg5SA7lxZ
-zZjrL52saevO25cigVl+hxcnY8DTpbk=
------END PRIVATE KEY-----
-`
-	const validKeyString = "MIIJQwIBADANBgkqhkiG9w0BAQEFAASCCS0wggkpAgEAAoICAQCrQDrezCptkWxXywm3KdXtvti+rPF3vfzOmXRKiKXDMpMxzoiaD5Wspirxxjr4C+B14xTwZjJZfxJL2HpPdOeBmA5tmAoGUESspnzxR/N1T4Uggx0vlAzFo0UZ0sutV6CJK19Kk38REwlGAB8gl6JYeSUuu6qREjrLVwFRH72acvC/p4jBki/MjAfEaeHc0yDJT9jpjpchw+HxYmy+1BnfNTAfGDdTVx9qWb+ByQ7xfvzuD9AOeqiWApDzZIuDDsaWn2orv+syoJVorV52/F+75zks6+fzQ+0sotBlRyvsZKGi80F89RIHwG+5LNSuRDWnVvrwv1oc6V2/lMidwT7yb0kXt0IRW6JzbaHyB2LkPazBlr6IPNupk83x9t2Buw0HI2SQKHMKOChUi2/906yLUOo3QpAi3Wk1c/Xu9DvGR/pOA15WCakiAfG3Fq6hUxNncmpOMeOLF/ezL19jZ3KA4E2Te4+GA0NYlXgkDbsIILWapHwqHXcDukynHisr7RawjrvXoLyasm4LO66aNXK9wtipSMDA7tdlQP6Xe9bHflDHxwreiuEGxnrsvLU7LHBWdD7UT2/u8zdrpimqi4L7W5p5aOBMn8jSVCO9+4CAxiLlc2qx5vb4/EPMsdQfacYP7vY9iVh/qPi3bcUVGUlg8wAJDrTksxU1K3FVR7BEPwIDAQABAoICAAhyrbTJ+5nWH7MhCASqIqyMyqJ1Y6AVlkAW397BaPP9Lbe6SZDYDfkrZVjx/3y3EUafgivtzrQNibiGIFqFGNqSxrtvUadIFGsz91vrwb3aw2V8MldjhVHGoSUJ+hQ+C2RY6GWEazNLbhyu6tovwMl+iHAKv/pSHOZlD2KSH0dcPjYmLJ/n90Wu7r8ovgSnwalMsBWtfBUlVaMTyOuNCQ2y0QHnrusElD8p2EGtynftXMrdqtTcBi8IR2BKaHt5oiBSEum/mPmxZE16p/tUreBWIsLtjE663htimMc2QJtzx2mDeIqSiGYrfxdyd7d1E/SCXPS9a9ObS42k6FSn8NPuK5kN6fPV5EDM2CqKEt9QZPlyrjZIuffOZtJj0xPuTwhRle4SOtyjn2c/vsv9FkrpB6B1v7T4+SSOIedOYkL+FP/IexMNG/ZTB5Y2hrZ03JW9RGpFAa4//qGG2qUCR3hErVS6v58qO/3+TCFSn/TI8AfcTcJbes3yTbVyLH6NAjATfYqJDJJFf+PG0qKc8q1NKvXmT+x4JiBBM32cOg11GPflxIZSKi9He50hnPGnC042N06ba/pkUPG49XwE37hnkIGmcFGcDIMDTEZnPBogPFqGpepYdwGWxbadRiUoX2wgurHRRmA0YM32MjVky9C112Q/Jy9PIk/qdjYdWfAhAoIBAQDcvxfUx7MKMFgYYm4E51X+7B9QoxdhVaxcoVgKVwfvedsLi0Bk1B1JVSXqnNfyDZbpxFz2v5Xd/dSit2rjnfBm+DoJYN9ZNnrbIH+sqsO1DuHZvMZlRDJbpt7PpVH/pcf7rEWRY+avkMMsiGwI/ruDs17eu7jULeG7N4jbkh1mdvF7K56O6Xe8jGJu5qaOPRWOkABK1cEOjQ5hB1iAwO/ua5hehP87SvbYzIhznQTE3AqTWgWbIyC4R85U7tS9hsXnSQ/ICM9pWcyN0Y667LwR2tX0QKl5M/YoM0sGmw+VQED8O2R45jTzSAcox77dRg55Pp3Xexsp2iVvaTIeAaevAoIBAQDGmZS1gFO4TEgQXHdmibLizDUHLuw662GC+3Hilx+nZBZtWOc6t8yquUyggSKQmBDiKAf0ipMexFao+5I3StJJ2P4Vel95Vcu8KgqCF736Q1iNgDHuW8ho8e0y+YE371x5co3POGC0SfbcnRTXQx2+wWXzZDh+KtnaDUyDN12/qCIUyAuSVLwEM28ZFM3qadG1aUdCB5oeo8jfgsg6YSukm4uE/tuI3/wAI7FkaCqvt/zkLauRff5FcNa7os4EKtNnGfebxscPyFYpMsW9VI0rfmYz02gho33lnofs4o8x/gxh6t5zfVbsZ7vUiSDJBahWboG9aE99OY2TKb6ibsBxAoIBAQChDBVR2oPnqg+Lcrw7fZ8Cxbeu992F2KBQUDHQEWCruSYyzNwk84+OQb3Q5a6yXHG+iNEd//ZRp+8q60/jUgXiybRlxTQNfS6ykYo0Kb1wabQiS5Qeq1tl/F9P9JfXQFafaTaz9MOHUMDjy3+uLFIXqpRLQX995R9rm/+P2ZDzgVF5///E2dXOTElACax3117TzIE6F6qqeASGi3ppLNmfAwZ95t/inTVsRARE/MhO6w4YJLQ0U7N6XoDM/BVfVGUr8OS/lpXjkW0oBjvwaehnylUPxuEdmOg8ufdBkX0T8XW3z4jkn2cAGouGl/vKqWLD2AgF/j16Ejn/hyrWM3TnAoIBAA6lSssrwIDJ11KljwSXyQJirtJtymv56cIACwD7xhDRF7pOoRa6cTRx383CWCszm6Mh8pw9D+Zn8kAZ9UlwkhtyDiLFWH8ZLaIds5Kub4siJkihGI2MZTYgCS8GKVpXo4ktQnnynWcOQU85okzRnULw/jS5wlTDkjc7XdYbYiV9H65KplfPOeJRbLL7zsensBhhwCiFaP8zct/QxDVR7yb/dYWESepJIktcVnuiFuvIdLTbDVj4YqT6UkuaEPlLszVaO+FYAlwOmRQGs4Bn2NVJR/4wa/B3HxSs4Tc96fN02bLq4CbCKoPajoZ46lsIuMZO9fBi3eHNObyNiopuAnECggEBAJiJ0tK/PGh+Q9uv57Z4QcmbawoxMQW1qK/rLYwacYsSpzo8VhbZf+Jh8biMg9AIQsLWnqmB3gmndePArGXkSxnilRozNLaeclTZy7rh00BctTEfgee4KxdiJKkJlVK0CE8I6txVRqkoOMyxsk1kRZ4l2yW2nxzyWlJKwvD75x2PQ6xWvpLAggynq00I3MzNIgR123jytN1NyC7l+mnGoC23ToXM7B3/PQjGYTq3jawKomrX1cmwzKBT+pzjtJSWvMeUEZQS1PpOhxpPBRHagdKXt+ug2DqDtU6rfpDGtTBh5QNkg5SA7lxZzZjrL52saevO25cigVl+hxcnY8DTpbk=" //nolint:lll
-	testCases := map[string]struct {
-		b   []byte
-		key string
-		err error
-	}{
-		"no input": {
-			err: errDecodePEMBlockClientKey,
-		},
-		"bad input": {
-			b:   []byte{1, 2, 3},
-			err: errDecodePEMBlockClientKey,
-		},
-		"valid key": {
-			b:   []byte(validPEM),
-			key: validKeyString,
-		},
-	}
-	for name, testCase := range testCases {
-		testCase := testCase
-		t.Run(name, func(t *testing.T) {
-			t.Parallel()
-			key, err := extractClientKey(testCase.b)
-			if testCase.err != nil {
-				require.Error(t, err)
-				assert.Equal(t, testCase.err.Error(), err.Error())
-			} else {
-				assert.NoError(t, err)
-			}
-			assert.Equal(t, testCase.key, key)
-		})
-	}
-}
-
-func Test_extractClientCertificate(t *testing.T) {
-	t.Parallel()
-	const validPEM = `
------BEGIN CERTIFICATE-----
-MIIGrDCCBJSgAwIBAgIEAdTnfTANBgkqhkiG9w0BAQsFADB7MQswCQYDVQQGEwJS
-TzESMBAGA1UEBxMJQnVjaGFyZXN0MRgwFgYDVQQKEw9DeWJlckdob3N0IFMuQS4x
-GzAZBgNVBAMTEkN5YmVyR2hvc3QgUm9vdCBDQTEhMB8GCSqGSIb3DQEJARYSaW5m
-b0BjeWJlcmdob3N0LnJvMB4XDTIwMDcwNDE1MjkzNloXDTMwMDcwMjE1MjkzNlow
-fTELMAkGA1UEBhMCUk8xEjAQBgNVBAcMCUJ1Y2hhcmVzdDEYMBYGA1UECgwPQ3li
-ZXJHaG9zdCBTLkEuMR0wGwYDVQQDDBRjLmoua2xhdmVyQGdtYWlsLmNvbTEhMB8G
-CSqGSIb3DQEJARYSaW5mb0BjeWJlcmdob3N0LnJvMIICIjANBgkqhkiG9w0BAQEF
-AAOCAg8AMIICCgKCAgEAobp2NlGUHMNBe08YEOnVG3QJjF3ZaXbRhE/II9rmtgJT
-NZtDohGChvFlNRsExKzVrKxHCeuJkVffwzQ6fYk4/M1RdYLJUh0UVw3e4WdApw8E
-7TJZxDYm4SHQNXUvt1Rt5TjslcXxIpDZgrMSc/kHROYEL9tdgdzPZErUJehXyJPh
-EzIrzmAJh501x7WwKPz9ctSVlItyavqEWFF2vyUa6X9DYmD9mQTz5c+VXNO5DkXm
-PFBIaEVDnvFtcjGJ56yEvFnWVukL+OUX7ezowrIOFOcp9udjgpeiHq+XvsQ6ER0D
-Jt25MiEId3NjkxtZ8BitDftTcLN/kt81hWKT7adMVc3kpIZ80cxrwRCttMd7sHAz
-KI9u7pMxv10eUOsIEY87ewBe3l6KvEnjA+9uIjim6gLLebDIaEH50Ee9PzNJ8fqQ
-2u54Ab4bt00/H1sUnJ6Ss/+WsQDOK1BsPRKKcnHZntOlHrs2Tu5+txKNU2cOapI8
-SjVULUNKrRXASbpfWnLUfri/HO742bJb/TjkOJcOxta3hTPFAhaRWBusVlB41XVH
-euH5DAhugYXeSNK6/6Ul8YvKUNH/7QbxuGIGXfth19Xl4QLI1umyEjZopSlt3tOi
-O2V1soVNSQCCfxXVoCTMESMLjhkjWdmBDhdy2GTW7S4YoJfqVKiS18rYkN7I4ZMC
-AwEAAaOCATQwggEwMAkGA1UdEwQCMAAwCwYDVR0PBAQDAgWgMDQGCWCGSAGG+EIB
-DQQnFiVDeWJlckdob3N0IEdlbmVyYXRlZCBVc2VyIENlcnRpZmljYXRlMBEGCWCG
-SAGG+EIBAQQEAwIHgDAdBgNVHQ4EFgQULwUtU5s6pL2NN9gPeEnKX0dhwiswga0G
-A1UdIwSBpTCBooAU6tdK1g/He5qzjeAoM5eHt4in9iWhf6R9MHsxCzAJBgNVBAYT
-AlJPMRIwEAYDVQQHEwlCdWNoYXJlc3QxGDAWBgNVBAoTD0N5YmVyR2hvc3QgUy5B
-LjEbMBkGA1UEAxMSQ3liZXJHaG9zdCBSb290IENBMSEwHwYJKoZIhvcNAQkBFhJp
-bmZvQGN5YmVyZ2hvc3Qucm+CCQCcVButZsQ0uzANBgkqhkiG9w0BAQsFAAOCAgEA
-ystGIMYhQWaEdTqlnLCytrr8657t+PuidZMNNIaPB3wN2Fi2xKf14DTg03mqxjmP
-Pb+f+PVNIOV5PdWD4jcQwOP1GEboGV0DFzlRGeAtDcvKwdee4oASJbZq1CETqDao
-hQTxKEWC+UBk2F36nOaEI6Sab+Mb4cR9//PAwvzOqrXuGF5NuIOX7eFtCMQSgQq6
-lRRqTQjekm0Dxigx4JA92Jo2qZRwCJ0T3IXBJGL831HCFJbDWv8PV3lsfFb/i2+v
-r54uywFQVWWp18dYi97gipfuQ4zRg2Ldx5aXSmnhhKpg5ioZvtk043QofF12YORh
-obElqavRbvvhZvlCouvcuoq9QKi7IPe5SJZkZ1X7ezMesCwBzwFpt6vRUAcslsNF
-bcYS1iSENlY/PTcDqBhbKuc9yAhq+/aUgaY/8VF5RWVzSRZufbf3BPwOkE4K0Uyb
-aobO/YX0JOkCacAD+4tdR6YSXNIMMRAOCBQvxbxFXaHzhwhzBAjdsC56FrJKwXvQ
-rRLU3tF4P0zFMeNTay8uTtUXugDK7EnklLESuYdpUJ8bUMlAUhJBi6UFI9/icMud
-xXvLRvhnBW9EtKib5JnVFUovcEUt+3EJbyst05nkL4YPjQS4TC9DHdo5SyRAy1Tp
-iOCYTbretAFZRhh6ycUN5hBeN8GMQxiMreMtDV4PEIQ=
------END CERTIFICATE-----
-`
-	const validCertificateString = "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" //nolint:lll
-	testCases := map[string]struct {
-		b           []byte
-		certificate string
-		err         error
-	}{
-		"no input": {
-			err: errDecodePEMBlockClientCert,
-		},
-		"bad input": {
-			b:   []byte{1, 2, 3},
-			err: errDecodePEMBlockClientCert,
-		},
-		"valid key": {
-			b:           []byte(validPEM),
-			certificate: validCertificateString,
-		},
-	}
-	for name, testCase := range testCases {
-		testCase := testCase
-		t.Run(name, func(t *testing.T) {
-			t.Parallel()
-			certificate, err := extractClientCertificate(testCase.b)
-			if testCase.err != nil {
-				require.Error(t, err)
-				assert.Equal(t, testCase.err.Error(), err.Error())
-			} else {
-				assert.NoError(t, err)
-			}
-			assert.Equal(t, testCase.certificate, certificate)
-		})
-	}
-}

internal/configuration/vpnunlimited.go

@@ -48,12 +48,12 @@ func (settings *Provider) readVPNUnlimited(r reader) (err error) {
 func (settings *OpenVPN) readVPNUnlimited(r reader) (err error) {
 	settings.ClientKey, err = readClientKey(r)
 	if err != nil {
-		return err
+		return fmt.Errorf("%w: %s", errClientKey, err)
 	}
 
 	settings.ClientCrt, err = readClientCertificate(r)
 	if err != nil {
-		return err
+		return fmt.Errorf("%w: %s", errClientCert, err)
 	}
 
 	return nil

internal/openvpn/parse/certificate.go

@@ -0,0 +1,14 @@
+package parse
+
+import (
+	"fmt"
+)
+
+func ExtractCert(b []byte) (certData string, err error) {
+	certData, err = extractPEM(b, "CERTIFICATE")
+	if err != nil {
+		return "", fmt.Errorf("%w: %s", ErrExtractPEM, err)
+	}
+
+	return certData, nil
+}

internal/openvpn/parse/certificate_test.go

@@ -0,0 +1,91 @@
+package parse
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_ExtractCert(t *testing.T) {
+	t.Parallel()
+
+	testCases := map[string]struct {
+		b        []byte
+		certData string
+		err      error
+	}{
+		"no input": {
+			err: errors.New("cannot extract PEM data: cannot decode PEM encoded block"),
+		},
+		"bad input": {
+			b:   []byte{1, 2, 3},
+			err: errors.New("cannot extract PEM data: cannot decode PEM encoded block"),
+		},
+		"valid key": {
+			b:        []byte(validCertPEM),
+			certData: validCertData,
+		},
+	}
+
+	for name, testCase := range testCases {
+		testCase := testCase
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			certData, err := ExtractCert(testCase.b)
+
+			if testCase.err != nil {
+				require.Error(t, err)
+				assert.Equal(t, testCase.err.Error(), err.Error())
+			} else {
+				assert.NoError(t, err)
+			}
+
+			assert.Equal(t, testCase.certData, certData)
+		})
+	}
+}
+
+const validCertPEM = `
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+`
+const validCertData = "MIIGrDCCBJSgAwIBAgIEAdTnfTANBgkqhkiG9w0BAQsFADB7MQswCQYDVQQGEwJSTzESMBAGA1UEBxMJQnVjaGFyZXN0MRgwFgYDVQQKEw9DeWJlckdob3N0IFMuQS4xGzAZBgNVBAMTEkN5YmVyR2hvc3QgUm9vdCBDQTEhMB8GCSqGSIb3DQEJARYSaW5mb0BjeWJlcmdob3N0LnJvMB4XDTIwMDcwNDE1MjkzNloXDTMwMDcwMjE1MjkzNlowfTELMAkGA1UEBhMCUk8xEjAQBgNVBAcMCUJ1Y2hhcmVzdDEYMBYGA1UECgwPQ3liZXJHaG9zdCBTLkEuMR0wGwYDVQQDDBRjLmoua2xhdmVyQGdtYWlsLmNvbTEhMB8GCSqGSIb3DQEJARYSaW5mb0BjeWJlcmdob3N0LnJvMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAobp2NlGUHMNBe08YEOnVG3QJjF3ZaXbRhE/II9rmtgJTNZtDohGChvFlNRsExKzVrKxHCeuJkVffwzQ6fYk4/M1RdYLJUh0UVw3e4WdApw8E7TJZxDYm4SHQNXUvt1Rt5TjslcXxIpDZgrMSc/kHROYEL9tdgdzPZErUJehXyJPhEzIrzmAJh501x7WwKPz9ctSVlItyavqEWFF2vyUa6X9DYmD9mQTz5c+VXNO5DkXmPFBIaEVDnvFtcjGJ56yEvFnWVukL+OUX7ezowrIOFOcp9udjgpeiHq+XvsQ6ER0DJt25MiEId3NjkxtZ8BitDftTcLN/kt81hWKT7adMVc3kpIZ80cxrwRCttMd7sHAzKI9u7pMxv10eUOsIEY87ewBe3l6KvEnjA+9uIjim6gLLebDIaEH50Ee9PzNJ8fqQ2u54Ab4bt00/H1sUnJ6Ss/+WsQDOK1BsPRKKcnHZntOlHrs2Tu5+txKNU2cOapI8SjVULUNKrRXASbpfWnLUfri/HO742bJb/TjkOJcOxta3hTPFAhaRWBusVlB41XVHeuH5DAhugYXeSNK6/6Ul8YvKUNH/7QbxuGIGXfth19Xl4QLI1umyEjZopSlt3tOiO2V1soVNSQCCfxXVoCTMESMLjhkjWdmBDhdy2GTW7S4YoJfqVKiS18rYkN7I4ZMCAwEAAaOCATQwggEwMAkGA1UdEwQCMAAwCwYDVR0PBAQDAgWgMDQGCWCGSAGG+EIBDQQnFiVDeWJlckdob3N0IEdlbmVyYXRlZCBVc2VyIENlcnRpZmljYXRlMBEGCWCGSAGG+EIBAQQEAwIHgDAdBgNVHQ4EFgQULwUtU5s6pL2NN9gPeEnKX0dhwiswga0GA1UdIwSBpTCBooAU6tdK1g/He5qzjeAoM5eHt4in9iWhf6R9MHsxCzAJBgNVBAYTAlJPMRIwEAYDVQQHEwlCdWNoYXJlc3QxGDAWBgNVBAoTD0N5YmVyR2hvc3QgUy5BLjEbMBkGA1UEAxMSQ3liZXJHaG9zdCBSb290IENBMSEwHwYJKoZIhvcNAQkBFhJpbmZvQGN5YmVyZ2hvc3Qucm+CCQCcVButZsQ0uzANBgkqhkiG9w0BAQsFAAOCAgEAystGIMYhQWaEdTqlnLCytrr8657t+PuidZMNNIaPB3wN2Fi2xKf14DTg03mqxjmPPb+f+PVNIOV5PdWD4jcQwOP1GEboGV0DFzlRGeAtDcvKwdee4oASJbZq1CETqDaohQTxKEWC+UBk2F36nOaEI6Sab+Mb4cR9//PAwvzOqrXuGF5NuIOX7eFtCMQSgQq6lRRqTQjekm0Dxigx4JA92Jo2qZRwCJ0T3IXBJGL831HCFJbDWv8PV3lsfFb/i2+vr54uywFQVWWp18dYi97gipfuQ4zRg2Ldx5aXSmnhhKpg5ioZvtk043QofF12YORhobElqavRbvvhZvlCouvcuoq9QKi7IPe5SJZkZ1X7ezMesCwBzwFpt6vRUAcslsNFbcYS1iSENlY/PTcDqBhbKuc9yAhq+/aUgaY/8VF5RWVzSRZufbf3BPwOkE4K0UybaobO/YX0JOkCacAD+4tdR6YSXNIMMRAOCBQvxbxFXaHzhwhzBAjdsC56FrJKwXvQrRLU3tF4P0zFMeNTay8uTtUXugDK7EnklLESuYdpUJ8bUMlAUhJBi6UFI9/icMudxXvLRvhnBW9EtKib5JnVFUovcEUt+3EJbyst05nkL4YPjQS4TC9DHdo5SyRAy1TpiOCYTbretAFZRhh6ycUN5hBeN8GMQxiMreMtDV4PEIQ=" //nolint:lll

internal/openvpn/parse/errors.go

@@ -0,0 +1,7 @@
+package parse
+
+import "errors"
+
+var (
+	ErrExtractPEM = errors.New("cannot extract PEM data")
+)

internal/openvpn/parse/key.go

@@ -0,0 +1,14 @@
+package parse
+
+import (
+	"fmt"
+)
+
+func ExtractPrivateKey(b []byte) (keyData string, err error) {
+	keyData, err = extractPEM(b, "PRIVATE KEY")
+	if err != nil {
+		return "", fmt.Errorf("%w: %s", ErrExtractPEM, err)
+	}
+
+	return keyData, nil
+}

internal/openvpn/parse/keys_test.go

@@ -0,0 +1,105 @@
+package parse
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_ExtractPrivateKey(t *testing.T) {
+	t.Parallel()
+
+	testCases := map[string]struct {
+		b       []byte
+		keyData string
+		err     error
+	}{
+		"no input": {
+			err: errors.New("cannot extract PEM data: cannot decode PEM encoded block"),
+		},
+		"bad input": {
+			b:   []byte{1, 2, 3},
+			err: errors.New("cannot extract PEM data: cannot decode PEM encoded block"),
+		},
+		"valid key": {
+			b:       []byte(validPrivateKeyPEM),
+			keyData: validPrivateKeyData,
+		},
+	}
+
+	for name, testCase := range testCases {
+		testCase := testCase
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			keyData, err := ExtractPrivateKey(testCase.b)
+
+			if testCase.err != nil {
+				require.Error(t, err)
+				assert.Equal(t, testCase.err.Error(), err.Error())
+			} else {
+				assert.NoError(t, err)
+			}
+
+			assert.Equal(t, testCase.keyData, keyData)
+		})
+	}
+}
+
+const validPrivateKeyPEM = `
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----
+`
+const validPrivateKeyData = "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" //nolint:lll

internal/openvpn/parse/pem.go

@@ -0,0 +1,27 @@
+package parse
+
+import (
+	"encoding/pem"
+	"errors"
+	"strings"
+)
+
+var (
+	errPEMDecode = errors.New("cannot decode PEM encoded block")
+)
+
+func extractPEM(b []byte, name string) (encodedData string, err error) {
+	name = strings.ToUpper(name) // certificate -> CERTIFICATE
+
+	pemBlock, _ := pem.Decode(b)
+	if pemBlock == nil {
+		return "", errPEMDecode
+	}
+
+	encodedBytes := pem.EncodeToMemory(pemBlock)
+	encodedData = string(encodedBytes)
+	encodedData = strings.ReplaceAll(encodedData, "\n", "")
+	encodedData = strings.TrimPrefix(encodedData, "-----BEGIN "+name+"-----")
+	encodedData = strings.TrimSuffix(encodedData, "-----END "+name+"-----")
+	return encodedData, nil
+}

internal/openvpn/parse/pem_test.go

@@ -0,0 +1,51 @@
+package parse
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_extractPEM(t *testing.T) {
+	t.Parallel()
+
+	testCases := map[string]struct {
+		b           []byte
+		name        string
+		encodedData string
+		err         error
+	}{
+		"no input": {
+			err: errors.New("cannot decode PEM encoded block"),
+		},
+		"bad input": {
+			b:   []byte{1, 2, 3},
+			err: errors.New("cannot decode PEM encoded block"),
+		},
+		"valid data": {
+			name:        "certificate",
+			b:           []byte(validCertPEM),
+			encodedData: validCertData,
+		},
+	}
+
+	for name, testCase := range testCases {
+		testCase := testCase
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			encodedData, err := extractPEM(testCase.b, testCase.name)
+
+			if testCase.err != nil {
+				require.Error(t, err)
+				assert.Equal(t, testCase.err.Error(), err.Error())
+			} else {
+				assert.NoError(t, err)
+			}
+
+			assert.Equal(t, testCase.encodedData, encodedData)
+		})
+	}
+}