如何强制客户端将 SSL 用于 postgresql？

Question

Environment:

Windows 10, localhost, same machine
pg 12
node 14
openssl 1.1.1k

I've read and done pg docs starting from this .

postgresql.conf (in C:\Program Files\PostgreSQL\12\data, my understanding is it controls pg DB server)

ssl = on # per pg doc: server will listen for both normal and SSL connections on the same TCP port, and will negotiate with any connecting client on whether to use SSL
ssl_cert_file = 'server.crt'
ssl_key_file = 'server.key'
ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' 
ssl_prefer_server_ciphers = on
ssl_ca_file = 'root.crt' # per pg doc, 18.9.3: To require the client to supply a trusted certificate
ssl_crl_file = ''

pg_hba.conf (in C:\Program Files\PostgreSQL\12\data, my understanding is its effect is on client such as web API or any DB consumers, not DB server)

...
hostssl all             all             127.0.0.1/32 cert clientcert=1
...

pSQL shows it's communicating over SSL:

But a simple node project can connect without SSL :

require('dotenv').config({ path: './environment/PostgreSql.env'});

const pgp = require('pg-promise')();    

const db = pgp(
    {
        user: process.env.PGuser,
        host: process.env.PGhost,
        database: process.env.PGdatabase,
        password: process.env.PGpassword,
        port: process.env.PGport,
        
        ssl: false  // optional, but true gets code: 'UNABLE_TO_VERIFY_LEAF_SIGNATURE'
    }
);

var sql = 'select * from current.testssl()';  
db.any(sql)
    .then
    (
        good => 
        { 
            console.log(good); // ssl false gets data 
        },
        bad => 
        { 
            console.log(bad); 
/* ssl true gets 
at TLSWrap.callbackTrampoline (internal/async_hooks.js:130:17) 
{
code: 'UNABLE_TO_VERIFY_LEAF_SIGNATURE', 
stack: 'Error: unable to verify the first certificate…ckTrampoline (internal/async_hooks.js:130:17)', 
message: 'unable to verify the first certificate'
}
*/
            
        }
    );

Answer 1

Add the following line at the beginning of your pg_hba.conf :

hostnossl  all  all  0.0.0.0/0  reject

That will reject all connection attempts that use an unencrypted TCP connection.

See the documentation for details.