Strip certs and keys in log before sending to Bugsnag

Signed-off-by: Nathan LeClaire <nathan.leclaire@gmail.com>

libmachine/log/log.go

@@ -1,13 +1,34 @@
 package log
 
-import "io"
+import (
+	"io"
+	"regexp"
+)
 
-var Logger MachineLogger
+const redactedText = "<REDACTED>"
+
+var (
+	Logger MachineLogger
+
+	// (?s) enables '.' to match '\n' -- see https://golang.org/pkg/regexp/syntax/
+	certRegex = regexp.MustCompile("(?s)-----BEGIN CERTIFICATE-----.*-----END CERTIFICATE-----")
+	keyRegex  = regexp.MustCompile("(?s)-----BEGIN RSA PRIVATE KEY-----.*-----END RSA PRIVATE KEY-----")
+)
 
 func init() {
 	Logger = NewFmtMachineLogger()
 }
 
+func stripSecrets(original []string) []string {
+	stripped := []string{}
+	for _, line := range original {
+		line = certRegex.ReplaceAllString(line, redactedText)
+		line = keyRegex.ReplaceAllString(line, redactedText)
+		stripped = append(stripped, line)
+	}
+	return stripped
+}
+
 // RedirectStdOutToStdErr prevents any log from corrupting the output
 func RedirectStdOutToStdErr() {
 	Logger.RedirectStdOutToStdErr()
@@ -62,5 +83,5 @@ func SetOutput(out io.Writer) {
 }
 
 func History() []string {
-	return Logger.History()
+	return stripSecrets(Logger.History())
 }

libmachine/log/log_test.go

@@ -0,0 +1,91 @@
+package log
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestStripSecrets(t *testing.T) {
+	testCases := []struct {
+		description string
+		input       []string
+		expected    []string
+	}{
+		{
+			description: "Log that does contain certs should have them stripped",
+			input: []string{
+				"Some mundane log lines",
+				"IP is foo.bar",
+				`Secret here: printf '%s' '-----BEGIN CERTIFICATE-----
+MIIC4DCCAcigAwIBAgIRAMMHbb4WFRVYsCOIrfM3dqkwDQYJKoZIhvcNAQELBQAw
+GTEXMBUGA1UEChMObmF0aGFubGVjbGFpcmUwHhcNMTUxMDEwMDE1MDAwWhcNMTgw
+OTI0MDE1MDAwWjAZMRcwFQYDVQQKEw5uYXRoYW5sZWNsYWlyZTCCASIwDQYJKoZI
+hvcNAQEBBQADggEPADCCAQoCggEBANLMyaAZPThE6lXtXYfUMZeF0pEfO4BQ7Rv8
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+II9e8NZEf5ktPXCNi0LKI6R1berejwQI3KKHEFbdZ8SKn93HgDh/Ip/dFctj+zBt
+CAlTWS3abehlCERn6Ze9IfZBtpI=
+-----END CERTIFICATE-----' | sudo tee /etc/docker/ca.pem`,
+			},
+			expected: []string{
+				"Some mundane log lines",
+				"IP is foo.bar",
+				`Secret here: printf '%s' '<REDACTED>' | sudo tee /etc/docker/ca.pem`,
+			},
+		},
+		{
+			description: "Log that does contain private keys should have them stripped",
+			input: []string{
+				"Some mundane log lines",
+				"IP is foo.bar",
+				`Secret here: printf '%s' '-----BEGIN RSA PRIVATE KEY-----
+MIIC4DCCAcigAwIBAgIRAMMHbb4WFRVYsCOIrfM3dqkwDQYJKoZIhvcNAQELBQAw
+GTEXMBUGA1UEChMObmF0aGFubGVjbGFpcmUwHhcNMTUxMDEwMDE1MDAwWhcNMTgw
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+II9e8NZEf5ktPXCNi0LKI6R1berejwQI3KKHEFbdZ8SKn93HgDh/Ip/dFctj+zBt
+CAlTWS3abehlCERn6Ze9IfZBtpI=
+-----END RSA PRIVATE KEY-----' | sudo tee /etc/docker/server-key.pem`,
+			},
+			expected: []string{
+				"Some mundane log lines",
+				"IP is foo.bar",
+				`Secret here: printf '%s' '<REDACTED>' | sudo tee /etc/docker/server-key.pem`,
+			},
+		},
+		{
+			description: "Log that does not contain secrets should not change",
+			input: []string{
+				"Some mundane log lines",
+				"IP is foo.bar",
+			},
+			expected: []string{
+				"Some mundane log lines",
+				"IP is foo.bar",
+			},
+		},
+	}
+
+	for _, tc := range testCases {
+		assert.Equal(t, tc.expected, stripSecrets(tc.input))
+	}
+}