Thread: Are these bugs?

Hi Dave, 

Thanks for your  reply.

Please see my inline responses below.

Best regards,

Brian Ye

On Sat, 7 Aug 2021 at 11:50, Brian Ye <brian.y.ye@gmail.com> wrote:

Dear Sirs,

I was trying to use postgresql jdbc.  The downloaded version did not work for me so I tried to build the project myself using Eclipse (the suggested gradle build method gave me errors).

Why did the download version not work? Can you elaborate.

Before answering this question, let me give some background information so that we are sure that postgresql with kerberos support works in my Windows environment (using SSPI).

I have the PostgreSQL server running as a service:

For both IPV4 and IPV6, I configured the login for my account ( briany@CORP) to use SSPI:

#ipv4

host    all             briany@CORP 0.0.0.0/0 sspi

#ipv6

host    all             briany@CORP ::/0 sspi

The SPN was registered:

Registered ServicePrincipalNames for CN=Brian Ye,CN=Users,DC=corp,DC=whamtech,DC=com:

        postgres/by64.corp.whamtech.com:5432

Now I use "psql" utility to login using Kerberos:

D:\Programs\PostgreSQL\13\data>psql -U briany@CORP -d postgres

psql (13.1)

WARNING: Console code page (437) differs from Windows code page (1252)

         8-bit characters might not work correctly. See psql reference

         page "Notes for Windows users" for details.

Type "help" for help.

postgres=> \dt

            List of relations

 Schema |    Name     | Type  |  Owner

--------+-------------+-------+----------

 public | simpletable | table | postgres

(1 row)

postgres=>

So it works.

I also configured ODBC using Kerberos, it also worked:

I downloaded the jdbc driver (postgresql-42.2.23.jar), and use the following simple test code to connect:

try {

         java.util.Properties info = new java.util.Properties();

         info.setProperty("user", "postgres");                                    // LINE a

         info.setProperty("password", "postgres");                            // LINE b

         //info.setProperty("user", "briany@CORP");                        // LINE c

         Class.forName("org.postgresql.Driver");

         c = DriverManager

            .getConnection

            (

            "jdbc:postgresql://by64:5432/",                            // LINE d

            info

            );

      } catch (Exception e) {

         e.printStackTrace();

         System.err.println(e.getClass().getName()+": "+e.getMessage());

         System.exit(0);

      }

It works this way (using password).

If I comment oout LINE a and LINE b, uncomment LINE c (to use a different account that requies Kerberos login), running this program produces the following:

Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/jna/platform/win32/Win32Exception

        at java.base/java.lang.Class.forName0(Native Method)

        at java.base/java.lang.Class.forName(Class.java:315)

        at org.postgresql.core.v3.ConnectionFactoryImpl.createSSPI(ConnectionFactoryImpl.java:82)

        at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:712)

        at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:161)

        at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:213)

        at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:51)

        at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:223)

        at org.postgresql.Driver.makeConnection(Driver.java:465)

        at org.postgresql.Driver.connect(Driver.java:264)

        at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677)

        at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:189)

        at PostgreSQLJDBC.main(PostgreSQLJDBC.java:21)

Caused by: java.lang.ClassNotFoundException: com.sun.jna.platform.win32.Win32Exception

        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)

        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)

        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)

        ... 13 more

I also downloaded jna, waffle libraries and tried it:

D:\Users\briany\test\java\jdbc\PostgreSQLJDBC_sspi>java -cp C:\Users\briany\Downloads\postgresql-42.2.23.jarlC:\users\briany\Downloads\jna-4.5.2.jar;C:\users\briany\Downloads\jna-platform-4.5.2.jar;C:\Users\briany\Downloads\waffle-jna-3.0.jar;. -Djava.security.auth.login.config=jaas.conf -Djava.security.krb5.conf=c:\windows\krb5.ini PostgreSQLJDBC

java.lang.ClassNotFoundException: org.postgresql.Driver

        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)

        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)

        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)

        at java.base/java.lang.Class.forName0(Native Method)

        at java.base/java.lang.Class.forName(Class.java:315)

        at PostgreSQLJDBC.main(PostgreSQLJDBC.java:18)

java.lang.ClassNotFoundException: org.postgresql.Driver

Changing LINE d to 

"jdbc:postgresql://by64:5432/briany?kerberosServerName=postgres&jaasApplicationName=pgjdbc&user=briany/by64.corp.whamtech.com:5432",

resulted in the same error:

"D:\Users\briany\test\java\jdbc\PostgreSQLJDBC_sspi>java -cp C:\Users\briany\Downloads\postgresql-42.2.23.jarlC:\users\briany\Downloads\jna-4.5.2.jar;C:\users\briany\Downloads\jna-platform-4.5.2.jar;C:\Users\briany\Downloads\waffle-jna-3.0.jar;. -Djava.security.auth.login.config=jaas.conf -Djava.security.krb5.conf=c:\windows\krb5.ini PostgreSQLJDBC

java.lang.ClassNotFoundException: org.postgresql.Driver

        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)

        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)

        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)

        at java.base/java.lang.Class.forName0(Native Method)

        at java.base/java.lang.Class.forName(Class.java:315)

        at PostgreSQLJDBC.main(PostgreSQLJDBC.java:18)

java.lang.ClassNotFoundException: org.postgresql.Driver 

What errors were encountered when you tried to build it?

I  can finally compile the package after adding the following into the build path, but have the run-time errors as described in the item 4) below.

 

I have encountered several problems:

1) Download the source from jdbc.posgresql.org, this source does not have the SSPIClient implementation  (it only has the ISSPIClient interface).

Interesting. I can confirm that it does not exist. I will rectify this.

 

2) Downloaded the source from github.  This version does not have the souce code for org.postgresql.util.DriverInfo.java.  I copied it from the downloaded file from step 1) above.

 https://github.com/pgjdbc/pgjdbc/archive/refs/tags/REL42.2.23.tar.gz does have DriverInfo

I don't remember the details.  I probably use git clone:

D:\DEVELOPMENT\PREALPHA\branches\postgresql-jdbc\.git>dir

 Volume in drive D is System Reserved

 Volume Serial Number is FEF3-860E

 Directory of D:\DEVELOPMENT\PREALPHA\branches\postgresql-jdbc\.git

08/03/2021  11:33 PM               130 config

08/03/2021  11:33 PM                73 description

08/03/2021  11:33 PM                23 HEAD

08/03/2021  11:33 PM    <DIR>          hooks

08/03/2021  11:33 PM    <DIR>          info

08/03/2021  11:33 PM    <DIR>          objects

08/03/2021  11:33 PM    <DIR>          refs

               3 File(s)            226 bytes

               4 Dir(s)  1,413,844,410,368 bytes free

 

3) After adding all the missing external libraries (such as jna, waffle, osgi...) it compiled successfully.

4) There are run time errors after testing the built library with a small test program:

    (4.1) If jna and jna-platform are of version 5.0.0 or newer,  the following line causes errors because no such a constructor exists:

SecBufferDesc continueToken = new SecBufferDesc(Sspi.SECBUFFER_TOKEN, receivedToken);

Note: Verson 5.0.0 (or newer) has only one constructor SecBufferDesc().

    (4.2) If jna and jna-platform are of older version (4.5.2), SecBufferDesc does provide 3 different constructor, but the following code causes errors:

Class.forName("waffle.windows.auth.impl.WindowsSecurityContextImpl");

This class references SspiUtil$ManagedSecBufferDesc, which is only available from version 5.0.0 of jna-platform (or newer).

So basically the implementation of SSPIClient uses different JNA APIs from incompatible versions.

Would you please take a look?

I can, but if you can provide your test program that would be helpful

The code above is all that I put into the "main" method of the test program.

Any help is very much appreciated!