src/main/java/net/hostsharing/hsadminng/hash/HashGenerator.java

@@ -31,7 +31,8 @@ public final class HashGenerator {
     public enum Algorithm {
         LINUX_SHA512(LinuxEtcShadowHashGenerator::hash, "6"),
         LINUX_YESCRYPT(LinuxEtcShadowHashGenerator::hash, "y"),
-        MYSQL_NATIVE(MySQLNativePasswordHashGenerator::hash, "*");
+        MYSQL_NATIVE(MySQLNativePasswordHashGenerator::hash, "*"),
+        SCRAM_SHA256(PostgreSQLScramSHA256::hash, "SCRAM-SHA-256");
 
         final BiFunction<HashGenerator, String, String> implementation;
         final String prefix;

src/main/java/net/hostsharing/hsadminng/hash/PostgreSQLScramSHA256.java

@@ -0,0 +1,61 @@
+package net.hostsharing.hsadminng.hash;
+
+import lombok.SneakyThrows;
+
+import javax.crypto.Mac;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.PBEKeySpec;
+import javax.crypto.spec.SecretKeySpec;
+import java.nio.charset.Charset;
+import java.security.InvalidKeyException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.spec.InvalidKeySpecException;
+import java.util.Base64;
+
+public class PostgreSQLScramSHA256 {
+
+    private static final String PBKDF_2_WITH_HMAC_SHA256 = "PBKDF2WithHmacSHA256";
+    private static final String HMAC_SHA256 = "HmacSHA256";
+    private static final String SHA256 = "SHA-256";
+    private static final int ITERATIONS = 4096;
+    public static final int KEY_LENGTH_IN_BITS = 256;
+
+    private static final PostgreSQLScramSHA256 scram = new PostgreSQLScramSHA256();
+
+    @SneakyThrows
+    public static String hash(final HashGenerator generator, final String password) {
+        if (generator.getSalt() == null) {
+            throw new IllegalStateException("no salt given");
+        }
+
+        final byte[] salt =  generator.getSalt().getBytes(Charset.forName("latin1")); // Base64.getEncoder().encode(generator.getSalt().getBytes());
+        final byte[] saltedPassword = scram.generateSaltedPassword(password, salt);
+        final byte[] clientKey = scram.hmacSHA256(saltedPassword, "Client Key".getBytes());
+        final byte[] storedKey = MessageDigest.getInstance(SHA256).digest(clientKey);
+        final byte[] serverKey = scram.hmacSHA256(saltedPassword, "Server Key".getBytes());
+
+        return "SCRAM-SHA-256${iterations}:{base64EncodedSalt}${base64EncodedStoredKey}:{base64EncodedServerKey}"
+                .replace("{iterations}", Integer.toString(ITERATIONS))
+                .replace("{base64EncodedSalt}", base64(salt))
+                .replace("{base64EncodedStoredKey}", base64(storedKey))
+                .replace("{base64EncodedServerKey}", base64(serverKey));
+    }
+
+    private static String base64(final byte[] salt) {
+        return Base64.getEncoder().encodeToString(salt);
+    }
+
+    private byte[] generateSaltedPassword(String password, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException {
+        final var spec = new PBEKeySpec(password.toCharArray(), salt, ITERATIONS, KEY_LENGTH_IN_BITS);
+        return SecretKeyFactory.getInstance(PBKDF_2_WITH_HMAC_SHA256).generateSecret(spec).getEncoded();
+    }
+
+    private byte[] hmacSHA256(byte[] key, byte[] message)
+            throws NoSuchAlgorithmException, InvalidKeyException {
+        final var mac = Mac.getInstance(HMAC_SHA256);
+        mac.init(new SecretKeySpec(key, HMAC_SHA256));
+        return mac.doFinal(message);
+    }
+
+}

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetType.java

@@ -82,17 +82,16 @@ public enum HsHostingAssetType implements Node {
 
     PGSQL_INSTANCE( // TODO.spec: identifier to be specified
             inGroup("PostgreSQL"),
-            requiredParent(MANAGED_SERVER)),
+            requiredParent(MANAGED_SERVER)), // TODO.spec: or MANAGED_WEBSPACE?
 
     PGSQL_USER( // named e.g. xyz00_abc
             inGroup("PostgreSQL"),
-            requiredParent(PGSQL_INSTANCE),
-            assignedTo(MANAGED_WEBSPACE)),
+            requiredParent(MANAGED_WEBSPACE), // thus, the MANAGED_WEBSPACE:Agent becomes RBAC owner
+            assignedTo(PGSQL_INSTANCE)), // keep in mind: no RBAC grants implied
 
     PGSQL_DATABASE( // named e.g. xyz00_abc
             inGroup("PostgreSQL"),
-            requiredParent(MANAGED_WEBSPACE), // TODO.spec: or PGSQL_USER?
-            assignedTo(PGSQL_INSTANCE)), // TODO.spec: or swapping parent+assignedTo?
+            requiredParent(PGSQL_USER)), // thus, the PGSQL_USER_USER:Agent becomes RBAC owner
 
     MARIADB_INSTANCE( // TODO.spec: identifier to be specified
             inGroup("MariaDB"),
@@ -101,12 +100,11 @@ public enum HsHostingAssetType implements Node {
     MARIADB_USER( // named e.g. xyz00_abc
             inGroup("MariaDB"),
             requiredParent(MANAGED_WEBSPACE), // thus, the MANAGED_WEBSPACE:Agent becomes RBAC owner
-            assignedTo(MARIADB_INSTANCE)), // keep in mind: no RBAC grants implied
+            assignedTo(MARIADB_INSTANCE)),
 
     MARIADB_DATABASE( // named e.g. xyz00_abc
             inGroup("MariaDB"),
-            requiredParent(MARIADB_USER), // thus, the MARIADB_USER:Agent becomes RBAC owner
-            assignedTo(MARIADB_INSTANCE)), // keep in mind: no RBAC grants implied
+            requiredParent(MARIADB_USER)), // thus, the MARIADB_USER:Agent becomes RBAC owner
 
     IP_NUMBER(
             inGroup("Server"),

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HostingAssetEntityValidator.java

@@ -32,7 +32,7 @@ public abstract class HostingAssetEntityValidator extends HsEntityValidator<HsHo
 
     HostingAssetEntityValidator(
             final HsHostingAssetType assetType,
-            final AlarmContact alarmContactValidation,
+            final AlarmContact alarmContactValidation, // hostmaster alert address is implicitly added where needed
             final ValidatableProperty<?, ?>... properties) {
         super(properties);
         this.bookingItemReferenceValidation = new ReferenceValidator<>(
@@ -213,6 +213,7 @@ public abstract class HostingAssetEntityValidator extends HsEntityValidator<HsHo
             super(policy, HsHostingAssetEntity::getAlarmContact);
         }
 
+        // hostmaster alert address is implicitly added where neccessary
         static AlarmContact isOptional() {
             return new AlarmContact(HsHostingAssetType.RelationPolicy.OPTIONAL);
         }

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HostingAssetEntityValidatorRegistry.java

@@ -29,6 +29,9 @@ public class HostingAssetEntityValidatorRegistry {
         register(MARIADB_INSTANCE, new HsMariaDbInstanceHostingAssetValidator());
         register(MARIADB_USER, new HsMariaDbUserHostingAssetValidator());
         register(MARIADB_DATABASE, new HsMariaDbDatabaseHostingAssetValidator());
+        register(PGSQL_INSTANCE, new HsPostgreSqlDbInstanceHostingAssetValidator());
+        register(PGSQL_USER, new HsPostgreSqlUserHostingAssetValidator());
+        register(PGSQL_DATABASE, new HsPostgreSqlDatabaseHostingAssetValidator());
     }
 
     private static void register(final Enum<HsHostingAssetType> type, final HsEntityValidator<HsHostingAssetEntity> validator) {

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsManagedServerHostingAssetValidator.java

@@ -14,7 +14,7 @@ class HsManagedServerHostingAssetValidator extends HostingAssetEntityValidator {
     public HsManagedServerHostingAssetValidator() {
         super(
                 MANAGED_SERVER,
-                AlarmContact.isOptional(), // hostmaster alert address is implicitly added
+                AlarmContact.isOptional(),
 
                 // monitoring
                 integerProperty("monit_max_cpu_usage").unit("%").min(10).max(100).withDefault(92),

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsManagedWebspaceHostingAssetValidator.java

@@ -10,7 +10,7 @@ class HsManagedWebspaceHostingAssetValidator extends HostingAssetEntityValidator
     public HsManagedWebspaceHostingAssetValidator() {
         super(
                 MANAGED_WEBSPACE,
-                AlarmContact.isOptional(), // hostmaster alert address is implicitly added
+                AlarmContact.isOptional(),
                 NO_EXTRA_PROPERTIES);
     }
 

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsMariaDbDatabaseHostingAssetValidator.java

@@ -20,6 +20,6 @@ class HsMariaDbDatabaseHostingAssetValidator extends HostingAssetEntityValidator
     @Override
     protected Pattern identifierPattern(final HsHostingAssetEntity assetEntity) {
         final var webspaceIdentifier = assetEntity.getParentAsset().getParentAsset().getIdentifier();
-        return Pattern.compile("^"+webspaceIdentifier+"$|^"+webspaceIdentifier+"_[a-z0-9]+$");
+        return Pattern.compile("^"+webspaceIdentifier+"$|^"+webspaceIdentifier+"_[a-z0-9_]+$");
     }
 }

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsMariaDbInstanceHostingAssetValidator.java

@@ -14,7 +14,7 @@ class HsMariaDbInstanceHostingAssetValidator extends HostingAssetEntityValidator
     public HsMariaDbInstanceHostingAssetValidator() {
         super(
                 MARIADB_INSTANCE,
-                AlarmContact.isOptional(), // hostmaster alert address is implicitly added
+                AlarmContact.isOptional(),
                 NO_EXTRA_PROPERTIES); // TODO.spec: specify instance properties, e.g. installed extensions
     }
 

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsMariaDbUserHostingAssetValidator.java

@@ -28,6 +28,6 @@ class HsMariaDbUserHostingAssetValidator extends HostingAssetEntityValidator {
     @Override
     protected Pattern identifierPattern(final HsHostingAssetEntity assetEntity) {
         final var webspaceIdentifier = assetEntity.getParentAsset().getIdentifier();
-        return Pattern.compile("^"+webspaceIdentifier+"$|^"+webspaceIdentifier+"_[a-z0-9]+$");
+        return Pattern.compile("^"+webspaceIdentifier+"$|^"+webspaceIdentifier+"_[a-z0-9_]+$");
     }
 }

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDatabaseHostingAssetValidator.java

@@ -0,0 +1,28 @@
+package net.hostsharing.hsadminng.hs.hosting.asset.validators;
+
+import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
+
+import java.util.regex.Pattern;
+
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.PGSQL_DATABASE;
+import static net.hostsharing.hsadminng.hs.validation.StringProperty.stringProperty;
+
+class HsPostgreSqlDatabaseHostingAssetValidator extends HostingAssetEntityValidator {
+
+    public HsPostgreSqlDatabaseHostingAssetValidator() {
+        super(
+                PGSQL_DATABASE,
+                AlarmContact.isOptional(),
+
+                stringProperty("encoding").matchesRegEx("[A-Z0-9_]+").maxLength(24).provided("LATIN1", "UTF8").withDefault("UTF8")
+
+                // TODO.spec: PostgreSQL extensions in instance and here? also decide which. Free selection or booleans/checkboxes?
+        );
+    }
+
+    @Override
+    protected Pattern identifierPattern(final HsHostingAssetEntity assetEntity) {
+        final var webspaceIdentifier = assetEntity.getParentAsset().getParentAsset().getIdentifier();
+        return Pattern.compile("^"+webspaceIdentifier+"$|^"+webspaceIdentifier+"_[a-z0-9_]+$");
+    }
+}

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDbInstanceHostingAssetValidator.java

@@ -0,0 +1,39 @@
+package net.hostsharing.hsadminng.hs.hosting.asset.validators;
+
+import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
+
+import java.util.regex.Pattern;
+
+import static java.util.Optional.ofNullable;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.PGSQL_DATABASE;
+
+class HsPostgreSqlDbInstanceHostingAssetValidator extends HostingAssetEntityValidator {
+
+    final static String DEFAULT_INSTANCE_IDENTIFIER_SUFFIX = "|PgSql.default"; // TODO.spec: specify instance naming
+
+    public HsPostgreSqlDbInstanceHostingAssetValidator() {
+        super(
+                PGSQL_DATABASE,
+                AlarmContact.isOptional(),
+
+                // TODO.spec: PostgreSQL extensions in database and here? also decide which. Free selection or booleans/checkboxes?
+                NO_EXTRA_PROPERTIES); // TODO.spec: specify instance properties, e.g. installed extensions
+    }
+
+    @Override
+    protected Pattern identifierPattern(final HsHostingAssetEntity assetEntity) {
+        return Pattern.compile(
+                "^" + Pattern.quote(assetEntity.getParentAsset().getIdentifier()
+                        + DEFAULT_INSTANCE_IDENTIFIER_SUFFIX)
+                        + "$");
+    }
+
+    @Override
+    public void preprocessEntity(final HsHostingAssetEntity entity) {
+        super.preprocessEntity(entity);
+        if (entity.getIdentifier() == null) {
+            ofNullable(entity.getParentAsset()).ifPresent(pa -> entity.setIdentifier(
+                    pa.getIdentifier() + DEFAULT_INSTANCE_IDENTIFIER_SUFFIX));
+        }
+    }
+}

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlUserHostingAssetValidator.java

@@ -0,0 +1,33 @@
+package net.hostsharing.hsadminng.hs.hosting.asset.validators;
+
+import net.hostsharing.hsadminng.hash.HashGenerator;
+import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
+
+import java.util.regex.Pattern;
+
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.PGSQL_USER;
+import static net.hostsharing.hsadminng.hs.validation.PasswordProperty.passwordProperty;
+
+class HsPostgreSqlUserHostingAssetValidator extends HostingAssetEntityValidator {
+
+    public HsPostgreSqlUserHostingAssetValidator() {
+        super(
+                PGSQL_USER,
+                AlarmContact.isOptional(),
+
+                // TODO.impl: we need to be able to suppress updating of fields etc., something like this:
+                // withFieldValidation(
+                //      referenceProperty(alarmContact).isOptional(),
+                //      referenceProperty(parentAsset).isWriteOnce(),
+                //      referenceProperty(assignedToAsset).isWriteOnce(),
+                // );
+
+                passwordProperty("password").minLength(8).maxLength(40).hashedUsing(HashGenerator.Algorithm.SCRAM_SHA256).writeOnly());
+    }
+
+    @Override
+    protected Pattern identifierPattern(final HsHostingAssetEntity assetEntity) {
+        final var webspaceIdentifier = assetEntity.getParentAsset().getIdentifier();
+        return Pattern.compile("^"+webspaceIdentifier+"$|^"+webspaceIdentifier+"_[a-z0-9_]+$");
+    }
+}

src/main/resources/api-definition/hs-hosting/hs-hosting-asset-schemas.yaml

@@ -17,6 +17,7 @@ components:
                 - DOMAIN_MBOX_SETUP
                 - EMAIL_ALIAS
                 - EMAIL_ADDRESS
+                - PGSQL_INSTANCE
                 - PGSQL_USER
                 - PGSQL_DATABASE
                 - MARIADB_INSTANCE

src/main/resources/db/changelog/7-hs-hosting/701-hosting-asset/7010-hs-hosting-asset.sql

@@ -16,6 +16,7 @@ create type HsHostingAssetType as enum (
     'DOMAIN_MBOX_SETUP',
     'EMAIL_ALIAS',
     'EMAIL_ADDRESS',
+    'PGSQL_INSTANCE',
     'PGSQL_USER',
     'PGSQL_DATABASE',
     'MARIADB_INSTANCE',
@@ -48,6 +49,9 @@ create table if not exists hs_hosting_asset
 --changeset hosting-asset-TYPE-HIERARCHY-CHECK:1 endDelimiter:--//
 -- ----------------------------------------------------------------------------
 
+-- TODO.impl: this could be generated from HsHostingAssetType
+--  also including a check for assignedToAssetUuud
+
 create or replace function hs_hosting_asset_type_hierarchy_check_tf()
     returns trigger
     language plpgsql as $$
@@ -73,11 +77,14 @@ begin
         when 'DOMAIN_SMTP_SETUP' then 'DOMAIN_SETUP'
         when 'DOMAIN_MBOX_SETUP' then 'DOMAIN_SETUP'
         when 'EMAIL_ADDRESS' then 'DOMAIN_MBOX_SETUP'
+
+        when 'PGSQL_INSTANCE' then 'MANAGED_SERVER'
         when 'PGSQL_USER' then 'MANAGED_WEBSPACE'
-        when 'PGSQL_DATABASE' then 'MANAGED_WEBSPACE'
+        when 'PGSQL_DATABASE' then 'PGSQL_USER'
+
         when 'MARIADB_INSTANCE' then 'MANAGED_SERVER'
-        when 'MARIADB_USER' then 'MARIADB_INSTANCE'
-        when 'MARIADB_DATABASE' then 'MARIADB_INSTANCE'
+        when 'MARIADB_USER' then 'MANAGED_WEBSPACE'
+        when 'MARIADB_DATABASE' then 'MARIADB_USER'
         else raiseException(format('[400] unknown asset type %s', NEW.type::text))
     end);
 

src/main/resources/db/changelog/7-hs-hosting/701-hosting-asset/7018-hs-hosting-asset-test-data.sql

@@ -27,6 +27,8 @@ declare
     domainMBoxSetupUuid                 uuid;
     mariaDbInstanceUuid                 uuid;
     mariaDbUserUuid                     uuid;
+    pgSqlInstanceUuid                   uuid;
+    PgSqlUserUuid                       uuid;
 begin
     currentTask := 'creating hosting-asset test-data ' || givenProjectCaption;
     call defineContext(currentTask, null, 'superuser-alex@hostsharing.net', 'global#global:ADMIN');
@@ -73,6 +75,8 @@ begin
     select uuid_generate_v4() into domainMBoxSetupUuid;
     select uuid_generate_v4() into mariaDbInstanceUuid;
     select uuid_generate_v4() into mariaDbUserUuid;
+    select uuid_generate_v4() into pgSqlInstanceUuid;
+    select uuid_generate_v4() into pgSqlUserUuid;
     debitorNumberSuffix := relatedDebitor.debitorNumberSuffix;
     defaultPrefix := relatedDebitor.defaultPrefix;
 
@@ -83,8 +87,11 @@ begin
        (uuid_generate_v4(),     cloudServerBI.uuid,     'CLOUD_SERVER',      null,                null,                  'vm20' || debitorNumberSuffix,                       'another CloudServer',          '{}'::jsonb),
        (managedWebspaceUuid,    managedWebspaceBI.uuid, 'MANAGED_WEBSPACE',  managedServerUuid,   null,                  defaultPrefix || '01',                               'some Webspace',                '{}'::jsonb),
        (mariaDbInstanceUuid,    null,                   'MARIADB_INSTANCE',  managedServerUuid,   null,                  'vm10' || debitorNumberSuffix || '.MariaDB.default', 'some default MariaDB instance','{}'::jsonb),
-       (mariaDbUserUuid,        null,                   'MARIADB_USER',      mariaDbInstanceUuid, managedWebspaceUuid,   defaultPrefix || '01_web',                           'some default MariaDB user',    '{ "password": "<TODO:replace-by-encrypted-mariadb-password"}'::jsonb ),
-       (uuid_generate_v4(),     null,                   'MARIADB_DATABASE',  mariaDbInstanceUuid, mariaDbUserUuid,       defaultPrefix || '01_web',                           'some default MariaDB database','{ "encryption": "utf8", "collation": "utf8"}'::jsonb ),
+       (mariaDbUserUuid,        null,                   'MARIADB_USER',      managedWebspaceUuid, mariaDbInstanceUuid,   defaultPrefix || '01_web',                           'some default MariaDB user',    '{ "password": "<TODO:replace-by-encrypted-mariadb-password"}'::jsonb ),
+       (uuid_generate_v4(),     null,                   'MARIADB_DATABASE',  mariaDbUserUuid,     mariaDbInstanceUuid,   defaultPrefix || '01_web',                           'some default MariaDB database','{ "encryption": "utf8", "collation": "utf8"}'::jsonb ),
+       (pgSqlInstanceUuid,      null,                   'PGSQL_INSTANCE',    managedServerUuid,   null,                  'vm10' || debitorNumberSuffix || '.Postgresql.default', 'some default Postgresql instance','{}'::jsonb),
+       (PgSqlUserUuid,          null,                   'PGSQL_USER',        managedWebspaceUuid, pgSqlInstanceUuid,     defaultPrefix || '01_web',                           'some default Postgresql user',    '{ "password": "<TODO:replace-by-encrypted-postgresql-password"}'::jsonb ),
+       (uuid_generate_v4(),     null,                   'PGSQL_DATABASE',    pgSqlUserUuid,       pgSqlInstanceUuid,     defaultPrefix || '01_web',                           'some default Postgresql database','{ "encryption": "utf8", "collation": "utf8"}'::jsonb ),
        (uuid_generate_v4(),     null,                   'EMAIL_ALIAS',       managedWebspaceUuid, null,                  defaultPrefix || '01-web',                           'some E-Mail-Alias',            '{ "target": [ "office@example.org", "archive@example.com" ] }'::jsonb),
        (webUnixUserUuid,        null,                   'UNIX_USER',         managedWebspaceUuid, null,                  defaultPrefix || '01-web',                           'some UnixUser for Website',    '{ "SSD-soft-quota": "128", "SSD-hard-quota": "256", "HDD-soft-quota": "512", "HDD-hard-quota": "1024"}'::jsonb),
        (domainSetupUuid,        null,                   'DOMAIN_SETUP',      null,                null,                  defaultPrefix || '.example.org',                     'some Domain-Setup',            '{}'::jsonb),

src/test/java/net/hostsharing/hsadminng/hash/HashGeneratorUnitTest.java

@@ -2,8 +2,12 @@ package net.hostsharing.hsadminng.hash;
 
 import org.junit.jupiter.api.Test;
 
+import java.nio.charset.Charset;
+import java.util.Base64;
+
 import static net.hostsharing.hsadminng.hash.HashGenerator.Algorithm.LINUX_SHA512;
 import static net.hostsharing.hsadminng.hash.HashGenerator.Algorithm.MYSQL_NATIVE;
+import static net.hostsharing.hsadminng.hash.HashGenerator.Algorithm.SCRAM_SHA256;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.catchThrowable;
 
@@ -14,17 +18,22 @@ class HashGeneratorUnitTest {
     final String GIVEN_SALT = "0123456789abcdef";
 
     // generated via mkpasswd for plaintext password GIVEN_PASSWORD (see above)
-    final String GIVEN_LINUX_SHA512_HASH = "$6$ooei1HK6JXVaI7KC$sY5d9fEOr36hjh4CYwIKLMfRKL1539bEmbVCZ.zPiH0sv7jJVnoIXb5YEefEtoSM2WWgDi9hr7vXRe3Nw8zJP/";
-    final String GIVEN_LINUX_YESCRYPT_HASH = "$y$j9T$wgYACPmBXvlMg2MzeZA0p1$KXUzd28nG.67GhPnBZ3aZsNNA5bWFdL/dyG4wS0iRw7";
+    final String GIVEN_LINUX_GENERATED_SHA512_HASH = "$6$ooei1HK6JXVaI7KC$sY5d9fEOr36hjh4CYwIKLMfRKL1539bEmbVCZ.zPiH0sv7jJVnoIXb5YEefEtoSM2WWgDi9hr7vXRe3Nw8zJP/";
+    final String GIVEN_LINUX_GENERATED_YESCRYPT_HASH = "$y$j9T$wgYACPmBXvlMg2MzeZA0p1$KXUzd28nG.67GhPnBZ3aZsNNA5bWFdL/dyG4wS0iRw7";
+
+    // generated in PostgreSQL using:
+    //  CREATE USER test WITH PASSWORD 'given password';
+    //  SELECT rolname, rolpassword FROM pg_authid WHERE rolname = 'test';
+    final String GIVEN_POSTGRESQL_GENERATED_SCRAM_SHA256_HASH = "SCRAM-SHA-256$4096:m8M12fdSTsKH+ywthTx1Zw==$4vsB1OddRNdsej9NPAFh91MPdtbOPjkQ85LQZS5lV0Q=:NsVpQNx4Ic/8Sqj1dxfBzUAxyF4FCTMpIsI+bOZCTfA=";
 
     @Test
     void verifiesLinuxPasswordAgainstSha512HashFromMkpasswd() {
-        LinuxEtcShadowHashGenerator.verify(GIVEN_LINUX_SHA512_HASH, GIVEN_PASSWORD); // throws exception if wrong
+        LinuxEtcShadowHashGenerator.verify(GIVEN_LINUX_GENERATED_SHA512_HASH, GIVEN_PASSWORD); // throws exception if wrong
     }
 
     @Test
     void verifiesLinuxPasswordAgainstYescryptHashFromMkpasswd() {
-        LinuxEtcShadowHashGenerator.verify(GIVEN_LINUX_YESCRYPT_HASH, GIVEN_PASSWORD); // throws exception if wrong
+        LinuxEtcShadowHashGenerator.verify(GIVEN_LINUX_GENERATED_YESCRYPT_HASH, GIVEN_PASSWORD); // throws exception if wrong
     }
 
     @Test
@@ -49,8 +58,20 @@ class HashGeneratorUnitTest {
     }
 
     @Test
-    void verifiesMySqlNativePassword() {
+    void generatesMySqlNativePasswordHash() {
         final var hash = HashGenerator.using(MYSQL_NATIVE).hash("Test1234");
         assertThat(hash).isEqualTo("*14F1A8C42F8B6D4662BB3ED290FD37BF135FE45C");
     }
+
+    @Test
+    void generatePostgreSqlScramPasswordHash() {
+        // given the same salt, extracted from the hash as generated by PostgreSQL
+        final var postgresBase64Salt = Base64.getDecoder().decode(GIVEN_POSTGRESQL_GENERATED_SCRAM_SHA256_HASH.split("\\$")[1].split(":")[1]);
+
+        // when the hash is re-generated via Java
+        final var hash = HashGenerator.using(SCRAM_SHA256).withSalt(new String(postgresBase64Salt, Charset.forName("latin1"))).hash(GIVEN_PASSWORD);
+
+        // then we are getting the same hash
+        assertThat(hash).isEqualTo(GIVEN_POSTGRESQL_GENERATED_SCRAM_SHA256_HASH);
+    }
 }

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetControllerRestTest.java

@@ -426,6 +426,68 @@ public class HsHostingAssetControllerRestTest {
                             }
                         }
                     ]
+                """),
+        PGSQL_INSTANCE(
+                List.of(
+                        HsHostingAssetEntity.builder()
+                                .type(HsHostingAssetType.PGSQL_INSTANCE)
+                                .parentAsset(TEST_MANAGED_SERVER_HOSTING_ASSET)
+                                .identifier("vm1234|PgSql.default")
+                                .caption("some fake PgSql instance")
+                                .build()),
+                """
+                    [
+                        {
+                            "type": "PGSQL_INSTANCE",
+                            "identifier": "vm1234|PgSql.default",
+                            "caption": "some fake PgSql instance",
+                            "alarmContact": null,
+                            "config": {}
+                        }
+                    ]
+                """),
+        PGSQL_USER(
+                List.of(
+                        HsHostingAssetEntity.builder()
+                                .type(HsHostingAssetType.PGSQL_USER)
+                                .identifier("xyz00_temp")
+                                .caption("some fake PgSql user")
+                                .build()),
+                """
+                    [
+                        {
+                            "type": "PGSQL_USER",
+                            "identifier": "xyz00_temp",
+                            "caption": "some fake PgSql user",
+                            "alarmContact": null,
+                            "config": {}
+                        }
+                    ]
+                """),
+        PGSQL_DATABASE(
+                List.of(
+                        HsHostingAssetEntity.builder()
+                                .type(HsHostingAssetType.PGSQL_DATABASE)
+                                .identifier("xyz00_temp")
+                                .caption("some fake PgSql database")
+                                .config(Map.ofEntries(
+                                        entry("encoding", "latin1"),
+                                        entry("collation", "latin2")
+                                ))
+                                .build()),
+                """
+                    [
+                        {
+                            "type": "PGSQL_DATABASE",
+                            "identifier": "xyz00_temp",
+                            "caption": "some fake PgSql database",
+                            "alarmContact": null,
+                            "config": {
+                                "encoding": "latin1",
+                                "collation": "latin2"
+                            }
+                        }
+                    ]
                 """);
 
         final HsHostingAssetType assetType;

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetPropsControllerAcceptanceTest.java

@@ -44,7 +44,10 @@ class HsHostingAssetPropsControllerAcceptanceTest {
                             "EMAIL_ADDRESS",
                             "MARIADB_INSTANCE",
                             "MARIADB_USER",
-                            "MARIADB_DATABASE"
+                            "MARIADB_DATABASE",
+                            "PGSQL_INSTANCE",
+                            "PGSQL_USER",
+                            "PGSQL_DATABASE"
                         ]
                         """));
         // @formatter:on

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetRepositoryIntegrationTest.java

@@ -246,7 +246,8 @@ class HsHostingAssetRepositoryIntegrationTest extends ContextBasedTestWithCleanu
             exactlyTheseAssetsAreReturned(
                     result,
                     "HsHostingAssetEntity(MANAGED_WEBSPACE, sec01, some Webspace, MANAGED_SERVER:vm1012, D-1000212:D-1000212 default project:separate ManagedWebspace)",
-                    "HsHostingAssetEntity(MARIADB_INSTANCE, vm1012.MariaDB.default, some default MariaDB instance, MANAGED_SERVER:vm1012)");
+                    "HsHostingAssetEntity(MARIADB_INSTANCE, vm1012.MariaDB.default, some default MariaDB instance, MANAGED_SERVER:vm1012)",
+                    "HsHostingAssetEntity(PGSQL_INSTANCE, vm1012.Postgresql.default, some default Postgresql instance, MANAGED_SERVER:vm1012)");
         }
     }
 

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetTypeUnitTest.java

@@ -132,7 +132,6 @@ class HsHostingAssetTypeUnitTest {
                 HA_MARIADB_USER *==> HA_MANAGED_WEBSPACE
                 HA_MARIADB_USER o..> HA_MARIADB_INSTANCE
                 HA_MARIADB_DATABASE *==> HA_MARIADB_USER
-                HA_MARIADB_DATABASE o..> HA_MARIADB_INSTANCE
                 HA_IP_NUMBER o..> HA_CLOUD_SERVER
                 HA_IP_NUMBER o..> HA_MANAGED_SERVER
                 HA_IP_NUMBER o..> HA_MANAGED_WEBSPACE
@@ -191,10 +190,9 @@ class HsHostingAssetTypeUnitTest {
                 HA_UNIX_USER *==> HA_MANAGED_WEBSPACE
                 HA_EMAIL_ALIAS *==> HA_MANAGED_WEBSPACE
                 HA_PGSQL_INSTANCE *==> HA_MANAGED_SERVER
-                HA_PGSQL_USER *==> HA_PGSQL_INSTANCE
-                HA_PGSQL_USER o..> HA_MANAGED_WEBSPACE
-                HA_PGSQL_DATABASE *==> HA_MANAGED_WEBSPACE
-                HA_PGSQL_DATABASE o..> HA_PGSQL_INSTANCE
+                HA_PGSQL_USER *==> HA_MANAGED_WEBSPACE
+                HA_PGSQL_USER o..> HA_PGSQL_INSTANCE
+                HA_PGSQL_DATABASE *==> HA_PGSQL_USER
                 HA_IP_NUMBER o..> HA_CLOUD_SERVER
                 HA_IP_NUMBER o..> HA_MANAGED_SERVER
                 HA_IP_NUMBER o..> HA_MANAGED_WEBSPACE

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HostingAssetEntityValidatorRegistryUnitTest.java

@@ -42,7 +42,10 @@ class HostingAssetEntityValidatorRegistryUnitTest {
                 HsHostingAssetType.EMAIL_ADDRESS,
                 HsHostingAssetType.MARIADB_INSTANCE,
                 HsHostingAssetType.MARIADB_USER,
-                HsHostingAssetType.MARIADB_DATABASE
+                HsHostingAssetType.MARIADB_DATABASE,
+                HsHostingAssetType.PGSQL_INSTANCE,
+                HsHostingAssetType.PGSQL_USER,
+                HsHostingAssetType.PGSQL_DATABASE
         );
     }
 }

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsMariaDbDatabaseHostingAssetValidatorUnitTest.java

@@ -40,7 +40,6 @@ class HsMariaDbDatabaseHostingAssetValidatorUnitTest {
         return HsHostingAssetEntity.builder()
                 .type(MARIADB_DATABASE)
                 .parentAsset(GIVEN_MARIADB_USER)
-                .assignedToAsset(GIVEN_MARIADB_INSTANCE)
                 .identifier("xyz00_temp")
                 .caption("some valid test MariaDB-Database")
                 .config(new HashMap<>(ofEntries(
@@ -112,6 +111,6 @@ class HsMariaDbDatabaseHostingAssetValidatorUnitTest {
 
         // then
         assertThat(result).containsExactly(
-                "'identifier' expected to match '^xyz00$|^xyz00_[a-z0-9]+$', but is 'xyz99-temp'");
+                "'identifier' expected to match '^xyz00$|^xyz00_[a-z0-9_]+$', but is 'xyz99-temp'");
     }
 }

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsMariaDbUserHostingAssetValidatorUnitTest.java

@@ -117,6 +117,6 @@ class HsMariaDbUserHostingAssetValidatorUnitTest {
 
         // then
         assertThat(result).containsExactly(
-                "'identifier' expected to match '^xyz00$|^xyz00_[a-z0-9]+$', but is 'xyz99-temp'");
+                "'identifier' expected to match '^xyz00$|^xyz00_[a-z0-9_]+$', but is 'xyz99-temp'");
     }
 }

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDatabaseHostingAssetValidatorUnitTest.java

@@ -0,0 +1,138 @@
+package net.hostsharing.hsadminng.hs.hosting.asset.validators;
+
+import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
+import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
+import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
+import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity.HsHostingAssetEntityBuilder;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+import java.util.stream.Stream;
+
+import static java.util.Map.ofEntries;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.PGSQL_DATABASE;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.PGSQL_INSTANCE;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.PGSQL_USER;
+import static net.hostsharing.hsadminng.hs.hosting.asset.TestHsHostingAssetEntities.TEST_MANAGED_SERVER_HOSTING_ASSET;
+import static net.hostsharing.hsadminng.hs.hosting.asset.TestHsHostingAssetEntities.TEST_MANAGED_WEBSPACE_HOSTING_ASSET;
+import static net.hostsharing.hsadminng.mapper.PatchMap.entry;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class HsPostgreSqlDatabaseHostingAssetValidatorUnitTest {
+
+    private static final HsHostingAssetEntity GIVEN_PGSQL_INSTANCE = HsHostingAssetEntity.builder()
+            .type(PGSQL_INSTANCE)
+            .parentAsset(TEST_MANAGED_SERVER_HOSTING_ASSET)
+            .identifier("vm1234|PgSql.default")
+            .caption("some valid test PgSql-Instance")
+            .build();
+
+    private static final HsHostingAssetEntity GIVEN_PGSQL_USER = HsHostingAssetEntity.builder()
+            .type(PGSQL_USER)
+            .parentAsset(TEST_MANAGED_WEBSPACE_HOSTING_ASSET)
+            .assignedToAsset(GIVEN_PGSQL_INSTANCE)
+            .identifier("xyz00_temp")
+            .caption("some valid test PgSql-User")
+            .config(new HashMap<>(ofEntries(
+                    entry("password", "Hallo Datenbank, lass mich rein!")
+            )))
+            .build();
+
+    private static HsHostingAssetEntityBuilder givenValidPgSqlDatabaseBuilder() {
+        return HsHostingAssetEntity.builder()
+                .type(PGSQL_DATABASE)
+                .parentAsset(GIVEN_PGSQL_USER)
+                .identifier("xyz00_temp")
+                .caption("some valid test PgSql-Database")
+                .config(new HashMap<>(ofEntries(
+                        entry("encoding", "LATIN1")
+                )));
+    }
+
+    @Test
+    void describesItsProperties() {
+        // given
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenValidPgSqlDatabaseBuilder().build().getType());
+
+        // when
+        final var props = validator.properties();
+
+        // then
+        assertThat(props).extracting(Object::toString).containsExactlyInAnyOrder(
+                "{type=string, propertyName=encoding, matchesRegEx=[[A-Z0-9_]+], maxLength=24, provided=[LATIN1, UTF8], defaultValue=UTF8}"
+        );
+    }
+
+    @Test
+    void validatesValidEntity() {
+        // given
+        final var givenPgSqlUserHostingAsset = givenValidPgSqlDatabaseBuilder().build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenPgSqlUserHostingAsset.getType());
+
+        // when
+        final var result = Stream.concat(
+                validator.validateEntity(givenPgSqlUserHostingAsset).stream(),
+                validator.validateContext(givenPgSqlUserHostingAsset).stream()
+        ).toList();
+
+        // then
+        assertThat(result).isEmpty();
+    }
+
+    @Test
+    void rejectsInvalidReferences() {
+        // given
+        final var givenPgSqlUserHostingAsset = givenValidPgSqlDatabaseBuilder()
+                .bookingItem(HsBookingItemEntity.builder().type(HsBookingItemType.CLOUD_SERVER).build())
+                .parentAsset(HsHostingAssetEntity.builder().type(PGSQL_INSTANCE).build())
+                .assignedToAsset(HsHostingAssetEntity.builder().type(PGSQL_INSTANCE).build())
+                .build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenPgSqlUserHostingAsset.getType());
+
+        // when
+        final var result = validator.validateEntity(givenPgSqlUserHostingAsset);
+
+        // then
+        assertThat(result).containsExactlyInAnyOrder(
+                "'PGSQL_DATABASE:xyz00_temp.config.unknown' is not expected but is set to 'wrong'",
+                "'PGSQL_DATABASE:xyz00_temp.config.encoding' is expected to be of type String, but is of type Integer"
+        );
+    }
+
+    @Test
+    void rejectsInvalidProperties() {
+        // given
+        final var givenPgSqlUserHostingAsset = givenValidPgSqlDatabaseBuilder()
+                .config(ofEntries(
+                        entry("unknown", "wrong"),
+                        entry("encoding", 10)
+                ))
+                .build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenPgSqlUserHostingAsset.getType());
+
+        // when
+        final var result = validator.validateEntity(givenPgSqlUserHostingAsset);
+
+        // then
+        assertThat(result).containsExactlyInAnyOrder(
+                "'PGSQL_DATABASE:xyz00_temp.config.unknown' is not expected but is set to 'wrong'",
+                "'PGSQL_DATABASE:xyz00_temp.config.encoding' is expected to be of type String, but is of type Integer"
+        );
+    }
+
+    @Test
+    void rejectsInvalidIdentifier() {
+        // given
+        final var givenPgSqlUserHostingAsset = givenValidPgSqlDatabaseBuilder()
+                .identifier("xyz99-temp")
+                .build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenPgSqlUserHostingAsset.getType());
+
+        // when
+        final var result = validator.validateEntity(givenPgSqlUserHostingAsset);
+
+        // then
+        assertThat(result).containsExactly(
+                "'identifier' expected to match '^xyz00$|^xyz00_[a-z0-9_]+$', but is 'xyz99-temp'");
+    }
+}

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlInstanceHostingAssetValidatorUnitTest.java

@@ -0,0 +1,116 @@
+package net.hostsharing.hsadminng.hs.hosting.asset.validators;
+
+import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
+import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
+import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
+import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity.HsHostingAssetEntityBuilder;
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static java.util.Map.entry;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.DOMAIN_SMTP_SETUP;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.MANAGED_WEBSPACE;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.MARIADB_INSTANCE;
+import static net.hostsharing.hsadminng.hs.hosting.asset.TestHsHostingAssetEntities.TEST_MANAGED_SERVER_HOSTING_ASSET;
+import static net.hostsharing.hsadminng.hs.hosting.asset.validators.HsMariaDbInstanceHostingAssetValidator.DEFAULT_INSTANCE_IDENTIFIER_SUFFIX;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class HsPostgreSqlInstanceHostingAssetValidatorUnitTest {
+
+    static HsHostingAssetEntityBuilder validEntityBuilder() {
+        return HsHostingAssetEntity.builder()
+                .type(MARIADB_INSTANCE)
+                .parentAsset(TEST_MANAGED_SERVER_HOSTING_ASSET)
+                .identifier(TEST_MANAGED_SERVER_HOSTING_ASSET.getIdentifier() + DEFAULT_INSTANCE_IDENTIFIER_SUFFIX);
+    }
+
+    @Test
+    void containsExpectedProperties() {
+        // when
+        final var validator = HostingAssetEntityValidatorRegistry.forType(DOMAIN_SMTP_SETUP);
+
+        // then
+        assertThat(validator.properties()).map(Map::toString).isEmpty();
+    }
+
+    @Test
+    void preprocessesTakesIdentifierFromParent() {
+        // given
+        final var givenEntity = validEntityBuilder().build();
+        assertThat(givenEntity.getParentAsset().getIdentifier()).as("precondition failed").isEqualTo("vm1234");
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenEntity.getType());
+
+        // when
+        validator.preprocessEntity(givenEntity);
+
+        // then
+        assertThat(givenEntity.getIdentifier()).isEqualTo("vm1234|MariaDB.default");
+    }
+
+    @Test
+    void acceptsValidEntity() {
+        // given
+        final var givenEntity = validEntityBuilder().build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenEntity.getType());
+
+        // when
+        final var result = validator.validateEntity(givenEntity);
+
+        // then
+        assertThat(result).isEmpty();
+    }
+
+    @Test
+    void rejectsInvalidIdentifier() {
+        // given
+        final var givenEntity = validEntityBuilder().identifier("example.org").build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenEntity.getType());
+
+        // when
+        final var result = validator.validateEntity(givenEntity);
+
+        // then
+        assertThat(result).containsExactly(
+                "'identifier' expected to match '^\\Qvm1234|MariaDB.default\\E$', but is 'example.org'"
+        );
+    }
+
+    @Test
+    void rejectsInvalidReferencedEntities() {
+        // given
+        final var mangedServerHostingAssetEntity = validEntityBuilder()
+                .bookingItem(HsBookingItemEntity.builder().type(HsBookingItemType.CLOUD_SERVER).build())
+                .parentAsset(HsHostingAssetEntity.builder().type(MANAGED_WEBSPACE).build())
+                .assignedToAsset(HsHostingAssetEntity.builder().type(MANAGED_WEBSPACE).build())
+                .build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(mangedServerHostingAssetEntity.getType());
+
+        // when
+        final var result = validator.validateEntity(mangedServerHostingAssetEntity);
+
+        // then
+        assertThat(result).containsExactlyInAnyOrder(
+                "'MARIADB_INSTANCE:vm1234|MariaDB.default.bookingItem' must be null but is of type CLOUD_SERVER",
+                "'MARIADB_INSTANCE:vm1234|MariaDB.default.parentAsset' must be of type MANAGED_SERVER but is of type MANAGED_WEBSPACE",
+                "'MARIADB_INSTANCE:vm1234|MariaDB.default.assignedToAsset' must be null but is of type MANAGED_WEBSPACE");
+    }
+
+    @Test
+    void rejectsInvalidProperties() {
+        // given
+        final var mangedServerHostingAssetEntity = validEntityBuilder()
+                .config(Map.ofEntries(
+                        entry("any", "false")
+                ))
+                .build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(mangedServerHostingAssetEntity.getType());
+
+        // when
+        final var result = validator.validateEntity(mangedServerHostingAssetEntity);
+
+        // then
+        assertThat(result).containsExactlyInAnyOrder(
+                "'MARIADB_INSTANCE:vm1234|MariaDB.default.config.any' is not expected but is set to 'false'");
+    }
+}

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlUserHostingAssetValidatorUnitTest.java

@@ -0,0 +1,125 @@
+package net.hostsharing.hsadminng.hs.hosting.asset.validators;
+
+import net.hostsharing.hsadminng.hash.HashGenerator;
+import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
+import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity.HsHostingAssetEntityBuilder;
+import org.junit.jupiter.api.Test;
+
+import java.nio.charset.Charset;
+import java.util.Base64;
+import java.util.HashMap;
+import java.util.stream.Stream;
+
+import static java.util.Map.ofEntries;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.PGSQL_INSTANCE;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.PGSQL_USER;
+import static net.hostsharing.hsadminng.hs.hosting.asset.TestHsHostingAssetEntities.TEST_MANAGED_SERVER_HOSTING_ASSET;
+import static net.hostsharing.hsadminng.hs.hosting.asset.TestHsHostingAssetEntities.TEST_MANAGED_WEBSPACE_HOSTING_ASSET;
+import static net.hostsharing.hsadminng.mapper.PatchMap.entry;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class HsPostgreSqlUserHostingAssetValidatorUnitTest {
+
+    private static final HsHostingAssetEntity GIVEN_PGSQL_INSTANCE = HsHostingAssetEntity.builder()
+            .type(PGSQL_INSTANCE)
+            .parentAsset(TEST_MANAGED_SERVER_HOSTING_ASSET)
+            .identifier("vm1234|PgSql.default")
+            .caption("some valid test PgSql-Instance")
+            .build();
+
+    private static HsHostingAssetEntityBuilder givenValidMariaDbUserBuilder() {
+        return HsHostingAssetEntity.builder()
+                .type(PGSQL_USER)
+                .parentAsset(TEST_MANAGED_WEBSPACE_HOSTING_ASSET)
+                .assignedToAsset(GIVEN_PGSQL_INSTANCE)
+                .identifier("xyz00_temp")
+                .caption("some valid test PgSql-User")
+                .config(new HashMap<>(ofEntries(
+                        entry("password", "Test1234")
+                )));
+    }
+
+    @Test
+    void describesItsProperties() {
+        // given
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenValidMariaDbUserBuilder().build().getType());
+
+        // when
+        final var props = validator.properties();
+
+        // then
+        assertThat(props).extracting(Object::toString).containsExactlyInAnyOrder(
+                "{type=password, propertyName=password, minLength=8, maxLength=40, writeOnly=true, computed=true, hashedUsing=SCRAM_SHA256, undisclosed=true}"
+        );
+    }
+
+    @Test
+    void preparesEntity() {
+        // given
+        final var givenMariaDbUserHostingAsset = givenValidMariaDbUserBuilder().build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenMariaDbUserHostingAsset.getType());
+
+        // when
+        HashGenerator.nextSalt(new String(Base64.getDecoder().decode("L1QxSVNyTU81b3NZS1djNg=="), Charset.forName("latin1")));
+        validator.prepareProperties(givenMariaDbUserHostingAsset);
+
+        // then
+        assertThat(givenMariaDbUserHostingAsset.getConfig()).containsExactlyInAnyOrderEntriesOf(ofEntries(
+                entry("password", "SCRAM-SHA-256$4096:L1QxSVNyTU81b3NZS1djNg==$bB4PEqHpnkoB9FwYfOjh+8yJvLsCnrwxom3TGK0CVJM=:ACRgTfhJwIZLrzhVRbJ3Qif5YhErYWAfkBThvtouW+8=")
+        ));
+    }
+
+    @Test
+    void validatesValidEntity() {
+        // given
+        final var givenMariaDbUserHostingAsset = givenValidMariaDbUserBuilder().build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenMariaDbUserHostingAsset.getType());
+
+        // when
+        final var result = Stream.concat(
+                validator.validateEntity(givenMariaDbUserHostingAsset).stream(),
+                validator.validateContext(givenMariaDbUserHostingAsset).stream()
+        ).toList();
+
+        // then
+        assertThat(result).isEmpty();
+    }
+
+    @Test
+    void rejectsInvalidProperties() {
+        // given
+        final var givenMariaDbUserHostingAsset = givenValidMariaDbUserBuilder()
+                .config(ofEntries(
+                        entry("unknown", 100),
+                        entry("password", "short")
+                ))
+                .build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenMariaDbUserHostingAsset.getType());
+
+        // when
+        final var result = validator.validateEntity(givenMariaDbUserHostingAsset);
+
+        // then
+        assertThat(result).containsExactlyInAnyOrder(
+                "'PGSQL_USER:xyz00_temp.config.unknown' is not expected but is set to '100'",
+                "'PGSQL_USER:xyz00_temp.config.password' length is expected to be at min 8 but length of provided value is 5",
+                "'PGSQL_USER:xyz00_temp.config.password' must contain at least one character of at least 3 of the following groups: upper case letters, lower case letters, digits, special characters"
+        );
+    }
+
+    @Test
+    void rejectsInvalidIdentifier() {
+        // given
+        final var givenMariaDbUserHostingAsset = givenValidMariaDbUserBuilder()
+                .identifier("xyz99-temp")
+                .build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenMariaDbUserHostingAsset.getType());
+
+        // when
+        final var result = validator.validateEntity(givenMariaDbUserHostingAsset);
+
+        // then
+        assertThat(result).containsExactly(
+                "'identifier' expected to match '^xyz00$|^xyz00_[a-z0-9_]+$', but is 'xyz99-temp'");
+    }
+}