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package auth
import (
"context"
"fmt"
"net/http"
"strconv"
"strings"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
)
const (
signingID = "rds-db"
emptyPayloadHash = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
)
// BuildAuthTokenOptions is the optional set of configuration properties for BuildAuthToken
type BuildAuthTokenOptions struct{}
// BuildAuthToken will return an authorization token used as the password for a DB
// connection.
//
// * endpoint - Endpoint consists of the port needed to connect to the DB. <host>:<port>
// * region - Region is the location of where the DB is
// * dbUser - User account within the database to sign in with
// * creds - Credentials to be signed with
//
// The following example shows how to use BuildAuthToken to create an authentication
// token for connecting to a MySQL database in RDS.
//
// authToken, err := BuildAuthToken(dbEndpoint, awsRegion, dbUser, awsCreds)
//
// // Create the MySQL DNS string for the DB connection
// // user:password@protocol(endpoint)/dbname?<params>
// connectStr = fmt.Sprintf("%s:%s@tcp(%s)/%s?allowCleartextPasswords=true&tls=rds",
// dbUser, authToken, dbEndpoint, dbName,
// )
//
// // Use db to perform SQL operations on database
// db, err := sql.Open("mysql", connectStr)
//
// See http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.IAMDBAuth.html
// for more information on using IAM database authentication with RDS.
func BuildAuthToken(ctx context.Context, endpoint, region, dbUser string, creds aws.CredentialsProvider, optFns ...func(options *BuildAuthTokenOptions)) (string, error) {
_, port := validateURL(endpoint)
if port == "" {
return "", fmt.Errorf("the provided endpoint is missing a port, or the provided port is invalid")
}
o := BuildAuthTokenOptions{}
for _, fn := range optFns {
fn(&o)
}
if creds == nil {
return "", fmt.Errorf("credetials provider must not ne nil")
}
// the scheme is arbitrary and is only needed because validation of the URL requires one.
if !(strings.HasPrefix(endpoint, "http://") || strings.HasPrefix(endpoint, "https://")) {
endpoint = "https://" + endpoint
}
req, err := http.NewRequest("GET", endpoint, nil)
if err != nil {
return "", err
}
values := req.URL.Query()
values.Set("Action", "connect")
values.Set("DBUser", dbUser)
req.URL.RawQuery = values.Encode()
signer := v4.NewSigner()
credentials, err := creds.Retrieve(ctx)
if err != nil {
return "", err
}
// Expire Time: 15 minute
query := req.URL.Query()
query.Set("X-Amz-Expires", "900")
req.URL.RawQuery = query.Encode()
signedURI, _, err := signer.PresignHTTP(ctx, credentials, req, emptyPayloadHash, signingID, region, time.Now().UTC())
if err != nil {
return "", err
}
url := signedURI
if strings.HasPrefix(url, "http://") {
url = url[len("http://"):]
} else if strings.HasPrefix(url, "https://") {
url = url[len("https://"):]
}
return url, nil
}
func validateURL(hostPort string) (host, port string) {
colon := strings.LastIndexByte(hostPort, ':')
if colon != -1 {
host, port = hostPort[:colon], hostPort[colon+1:]
}
if !validatePort(port) {
port = ""
return
}
if strings.HasPrefix(host, "[") && strings.HasSuffix(host, "]") {
host = host[1 : len(host)-1]
}
return
}
func validatePort(port string) bool {
if _, err := strconv.Atoi(port); err == nil {
return true
}
return false
}
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