How to connect to mongoDB via ssl using .crt file in Go - mongodb

Question

I am trying to connect to a mongo database hosted in azure using the .crt file.
I am successfully able to connect from my linux machine terminal using command:
mongo mongodb://username:password#prod-replicaset-0.com:27017,prod-replicaset-1.com:27017,prod-replicaset-2.com:27017/ --tls --tlsCAFile rootca.crt --tlsAllowInvalidCertificates
I am also able to connect from mongo UI client like robo3T by setting "Use SSL protocol" and using Auth Mechanism as "SCRAM-SHA-256".
[If I set Auth Mechanism to any other value, results in Authentication Failure]
But I am not able to connect to that database in Go lang code.
Here is a sample of code I am using:
package main
import (
"crypto/tls"
"crypto/x509"
"io/ioutil"
"log"
"net"
"github.com/globalsign/mgo"
)
func InitMongo() error {
rootCerts := x509.NewCertPool()
ca, err := ioutil.ReadFile("./rootca.crt")
if err != nil {
log.Fatalf("failed to read file : %s", err.Error())
return err
}
success := rootCerts.AppendCertsFromPEM(ca)
if !success {
log.Printf("rootcert failed")
}
connStr := "mongodb://username:password#prod-replicaset-0.com:27017,prod-replicaset-1.com:27017,prod-replicaset-2.com:27017/?ssl=true"
dbDialInfo, err := mgo.ParseURL(connStr)
if err != nil {
log.Fatal("unable to parse url - " + err.Error())
}
dbDialInfo.DialServer = func(addr *mgo.ServerAddr) (net.Conn, error) {
return tls.Dial("tcp", addr.String(), &tls.Config{
RootCAs: rootCerts,
InsecureSkipVerify: true,
})
}
// dbDialInfo.Mechanism = "SCRAM-SHA-256"
_session, err := mgo.DialWithInfo(dbDialInfo)
if err != nil {
log.Fatalf("failed to creating db session : %s", err.Error())
return err
}
log.Printf("Created session - %v", _session)
return nil
}
When I run this code, I get error:
failed to creating db session : "server returned error on SASL authentication step: Authentication failed."
If I set [dbDialInfo.Mechanism = "SCRAM-SHA-256"] before creating session, I get error:
failed to creating db session : "SASL support not enabled during build (-tags sasl)"
Please let me know what is causing this issue, how can I connect to the database.
Currently I am using "github.com/globalsign/mgo", if it required to use any other library, that's totally fine for me.
I just want to get connected to the db.
rootca.crt file looks something like:
-----BEGIN CERTIFICATE-----
MIIGLjCCBBagAwIBAgIUbxINX1qe6W+7kolWGp+MX8NbYj8wDQYJKoZIhvcNAQEL
<blah> <blah> <blah> <blah> <blah> <blah> <blah> <blah> <blah>
jCZAGGHmbrR3zeIsOY8yKau0IXqRp5Wy6NQ0poOTcma9BfwNUVc4/ixsCkEVYbgW
eMs=
-----END CERTIFICATE-----
Thank you.

Answer 1

After researching a lot, I was not able to find a way to connect to mongodb using .crt file using globalsign library.
However I was successfully able to do this using mongo-driver library.
here connection string can be of format:
mongodb://user:password#replicaset-0.com:27017,replicaset-1.com:27017,replicaset-2.com:27017/?ssl=true&tlsCAFile=./ca.crt&tlsCertificateKeyFile=./ca.pem&authSource=admin&replicaSet=replicaset
Sample code:
import (
"context"
"log"
"os"
// "github.com/globalsign/mgo"
mgo "go.mongodb.org/mongo-driver/mongo"
mongoOptions "go.mongodb.org/mongo-driver/mongo/options"
)
func InitMongo() (error) {
connStr := os.Getenv("MONGODB_CONN_STR")
dbName := os.Getenv("MONGODB_DATABASE")
clientOpts := mongoOptions.Client().ApplyURI(connStr)
if err := clientOpts.Validate(); err != nil {
log.Print("unable to parse url")
log.Fatal(err)
}
client, err := mgo.Connect(context.TODO(), clientOpts)
if err != nil {
log.Print("unable to connect into database")
log.Fatal(err)
}
if err := client.Ping(context.TODO(), nil); err != nil {
log.Print("database ping failed")
log.Fatal(err)
}
//client.Database(dbName)
return nil
}