My connection was disconnected continuously because it was not secure. The topic is about secure connection between Matlab and PostgreSQL, which is undocumented widely, for instance, discussed here about Secure SSL connection between Matlab and PostgreSQL.
Summary of the blog post
Make appropriate changes in
- Generate certificate for the server; diseserver.csr, root.crt; postgreSQL directry (diseserver.key, diseserver.crt, and root.crt); please see more precisely here
- postgresql.conf
- pg_hba.conf
- generate client certificates
- convert key to pkcs8 format
- check correct version of JDBC driver
- check client certificate
dbtest.m
Certificate for the server
$openssl req -out diseserver.csr -new -newkey rsa:2048 -nodes -keyout diseserver.key
postgresql.conf
ssl = on
ssl_cert_file = 'diseserver.crt' # (change requires restart)
ssl_key_file = 'diseserver.key' # (change requires restart)
ssl_ca_file = 'root.crt' # (change requires restart)
pg_hba.conf
hostnossl all all 0.0.0.0/0 reject
hostssl mytable all 0.0.0.0/0 cert map=ssl clientcert=1
Generate client certificates
$mkdir ~/.postgresql
$cd ~/.postgresql
$openssl req -out postgresql.csr -new -newkey rsa:2048 -nodes -keyout postgresql.key
Convert key to pkcs8 format
$openssl pkcs8 -topk8 -inform PEM -outform DER -in postgresql.key -out postgresql.pk8 -nocrypt
Check client certificate
jdbc:postgresql://diseserver.mydomain.org/mytable?ssl=true&sslfactory=org.postgresql.ssl.jdbc4.LibPQFactory&sslmode=verify-full&
dbtest.m
matlab function
function dbtest
driver = 'org.postgresql.Driver';
[~,username] = system('whoami');
url = 'jdbc:postgresql://diseserver.mydomain.org/mytable?ssl=true&sslfactory=org.postgresql.ssl.jdbc4.LibPQFactory&sslmode=verify-full&';
myconn = database('mytable', username, '', driver, url);
if ~isempty(myconn.Message)
fprintf(2,'%s\n', myconn.Message);
else
fprintf(1, 'Connected!\n');
end
end