golang开发问题

开发问题：
How to find out which types implement which interface in Golang?
How do you quickly find the implementation(s) of an interface in Golang?

Ctrl + Alt+b

Ctrl +b show usage

证书问题1：

2018/03/09 10:44:13 check userEcaCert signature:  x509: invalid signature: parent certificate cannot sign this kind of certificate

解决：

ecaCert.BasicConstraintsValid = true
ecaCert.IsCA = true
ecaCert.KeyUsage = x509.KeyUsageCertSign

证书问题2：

根证书、二级证书、三级证书都能经过https验证都需要加上以上三个参数

D:project>server.exe
2018/03/13 09:38:39 http: TLS handshake error from 127.0.0.1:56660: tls: failed to verify client's certificate: x509: certificate signed by unknown authority (possibly because of "x509: invalid signature: parent certificate cannot sign this kind of certificate" while trying to verify candidate authority certificate "usechaineca")

Cert := &x509.Certificate{
		SerialNumber: big.NewInt(1658),
		Subject: pkix.Name{
			Country: []string{"CN"},
			Organization: []string{"usechainEca"},
			OrganizationalUnit: []string{"eca"},
		},
		NotBefore: time.Now(),
		NotAfter: time.Now().AddDate(10,0,0),
		SubjectKeyId: []byte{1,2,3,4,6},
		ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
		BasicConstraintsValid: true,
		IsCA: true,
		KeyUsage: x509.KeyUsageDigitalSignature|x509.KeyUsageCertSign,
	}

如果是openssl生成的则需要客户端证书改成如下格式：

openssl genrsa -out client.key 2048
openssl req -new -key client.key -subj "/CN=client" -out client.csr
openssl x509 -req -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out client.crt -days 5000

改成：
openssl genrsa -out client.key 2048
openssl req -new -key client.key -subj "/CN=client" -out client.csr
echo extendedKeyUsage=clientAuth > extfile.conf
openssl x509 -req -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -extfile extfile.conf -out client.crt -days 5000