doc/hs-hosting-asset-type-structure.md

@@ -1,5 +1,6 @@
 ## HostingAsset Type Structure
 
+
 ### Domain
 
 ```plantuml
@@ -11,29 +12,27 @@ package Booking #feb28c {
     entity BI_CLOUD_SERVER
     entity BI_MANAGED_SERVER
     entity BI_MANAGED_WEBSPACE
-    entity BI_DOMAIN_DNS_SETUP
-    entity BI_DOMAIN_SMTP_SETUP
 }
 
 package Hosting #feb28c{
     package Domain #99bcdb {
-        entity HA_DOMAIN_SETUP        
+        entity HA_DOMAIN_SETUP
-        entity HA_DOMAIN_DNS_SETUP        
+        entity HA_DOMAIN_DNS_SETUP
-        entity HA_DOMAIN_HTTP_SETUP        
+        entity HA_DOMAIN_HTTP_SETUP
-        entity HA_DOMAIN_SMTP_SETUP        
+        entity HA_DOMAIN_SMTP_SETUP
-        entity HA_DOMAIN_MBOX_SETUP        
+        entity HA_DOMAIN_MBOX_SETUP
         entity HA_EMAIL_ADDRESS
     }
 
     package Server #99bcdb {
-        entity HA_CLOUD_SERVER        
+        entity HA_CLOUD_SERVER
-        entity HA_MANAGED_SERVER        
+        entity HA_MANAGED_SERVER
         entity HA_IP_NUMBER
     }
 
     package Webspace #99bcdb {
-        entity HA_MANAGED_WEBSPACE        
+        entity HA_MANAGED_WEBSPACE
-        entity HA_UNIX_USER        
+        entity HA_UNIX_USER
         entity HA_EMAIL_ALIAS
     }
 
@@ -43,20 +42,21 @@ BI_CLOUD_SERVER *--> BI_PRIVATE_CLOUD
 BI_MANAGED_SERVER *--> BI_PRIVATE_CLOUD
 BI_MANAGED_WEBSPACE *--> BI_MANAGED_SERVER
 
-HA_CLOUD_SERVER ==* BI_CLOUD_SERVER
+HA_CLOUD_SERVER *==> BI_CLOUD_SERVER
-HA_MANAGED_SERVER ==* BI_MANAGED_SERVER
+HA_MANAGED_SERVER *==> BI_MANAGED_SERVER
-HA_MANAGED_WEBSPACE ==* BI_MANAGED_WEBSPACE
+HA_MANAGED_WEBSPACE *==> BI_MANAGED_WEBSPACE
 HA_MANAGED_WEBSPACE o..> HA_MANAGED_SERVER
 HA_UNIX_USER *==> HA_MANAGED_WEBSPACE
+HA_EMAIL_ALIAS *==> HA_MANAGED_WEBSPACE
 HA_DOMAIN_SETUP o..> HA_DOMAIN_SETUP
 HA_DOMAIN_DNS_SETUP *==> HA_DOMAIN_SETUP
+HA_DOMAIN_DNS_SETUP o..> HA_MANAGED_WEBSPACE
 HA_DOMAIN_HTTP_SETUP *==> HA_DOMAIN_SETUP
 HA_DOMAIN_HTTP_SETUP o..> HA_UNIX_USER
 HA_DOMAIN_SMTP_SETUP *==> HA_DOMAIN_SETUP
 HA_DOMAIN_SMTP_SETUP o..> HA_MANAGED_WEBSPACE
 HA_DOMAIN_MBOX_SETUP *==> HA_DOMAIN_SETUP
 HA_DOMAIN_MBOX_SETUP o..> HA_MANAGED_WEBSPACE
-HA_EMAIL_ALIAS *==> HA_MANAGED_WEBSPACE
 HA_EMAIL_ADDRESS *==> HA_DOMAIN_MBOX_SETUP
 HA_IP_NUMBER o..> HA_CLOUD_SERVER
 HA_IP_NUMBER o..> HA_MANAGED_SERVER
@@ -70,6 +70,7 @@ package Legend #white {
 }
 Booking -down[hidden]->Legend
 ```
+
 ### MariaDB
 
 ```plantuml
@@ -81,26 +82,24 @@ package Booking #feb28c {
     entity BI_CLOUD_SERVER
     entity BI_MANAGED_SERVER
     entity BI_MANAGED_WEBSPACE
-    entity BI_DOMAIN_DNS_SETUP
-    entity BI_DOMAIN_SMTP_SETUP
 }
 
 package Hosting #feb28c{
     package MariaDB #99bcdb {
-        entity HA_MARIADB_INSTANCE        
+        entity HA_MARIADB_INSTANCE
-        entity HA_MARIADB_USER        
+        entity HA_MARIADB_USER
         entity HA_MARIADB_DATABASE
     }
 
     package Server #99bcdb {
-        entity HA_CLOUD_SERVER        
+        entity HA_CLOUD_SERVER
-        entity HA_MANAGED_SERVER        
+        entity HA_MANAGED_SERVER
         entity HA_IP_NUMBER
     }
 
     package Webspace #99bcdb {
-        entity HA_MANAGED_WEBSPACE        
+        entity HA_MANAGED_WEBSPACE
-        entity HA_UNIX_USER        
+        entity HA_UNIX_USER
         entity HA_EMAIL_ALIAS
     }
 
@@ -110,16 +109,16 @@ BI_CLOUD_SERVER *--> BI_PRIVATE_CLOUD
 BI_MANAGED_SERVER *--> BI_PRIVATE_CLOUD
 BI_MANAGED_WEBSPACE *--> BI_MANAGED_SERVER
 
-HA_CLOUD_SERVER ==* BI_CLOUD_SERVER
+HA_CLOUD_SERVER *==> BI_CLOUD_SERVER
-HA_MANAGED_SERVER ==* BI_MANAGED_SERVER
+HA_MANAGED_SERVER *==> BI_MANAGED_SERVER
-HA_MANAGED_WEBSPACE ==* BI_MANAGED_WEBSPACE
+HA_MANAGED_WEBSPACE *==> BI_MANAGED_WEBSPACE
 HA_MANAGED_WEBSPACE o..> HA_MANAGED_SERVER
 HA_UNIX_USER *==> HA_MANAGED_WEBSPACE
 HA_EMAIL_ALIAS *==> HA_MANAGED_WEBSPACE
 HA_MARIADB_INSTANCE *==> HA_MANAGED_SERVER
-HA_MARIADB_USER *==> HA_MARIADB_INSTANCE
+HA_MARIADB_USER *==> HA_MANAGED_WEBSPACE
-HA_MARIADB_USER o..> HA_MANAGED_WEBSPACE
+HA_MARIADB_USER o..> HA_MARIADB_INSTANCE
-HA_MARIADB_DATABASE *==> HA_MANAGED_WEBSPACE
+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
@@ -133,6 +132,7 @@ package Legend #white {
 }
 Booking -down[hidden]->Legend
 ```
+
 ### PostgreSQL
 
 ```plantuml
@@ -144,26 +144,24 @@ package Booking #feb28c {
     entity BI_CLOUD_SERVER
     entity BI_MANAGED_SERVER
     entity BI_MANAGED_WEBSPACE
-    entity BI_DOMAIN_DNS_SETUP
-    entity BI_DOMAIN_SMTP_SETUP
 }
 
 package Hosting #feb28c{
     package PostgreSQL #99bcdb {
-        entity HA_PGSQL_INSTANCE        
+        entity HA_PGSQL_INSTANCE
-        entity HA_PGSQL_USER        
+        entity HA_PGSQL_USER
         entity HA_PGSQL_DATABASE
     }
 
     package Server #99bcdb {
-        entity HA_CLOUD_SERVER        
+        entity HA_CLOUD_SERVER
-        entity HA_MANAGED_SERVER        
+        entity HA_MANAGED_SERVER
         entity HA_IP_NUMBER
     }
 
     package Webspace #99bcdb {
-        entity HA_MANAGED_WEBSPACE        
+        entity HA_MANAGED_WEBSPACE
-        entity HA_UNIX_USER        
+        entity HA_UNIX_USER
         entity HA_EMAIL_ALIAS
     }
 
@@ -173,9 +171,9 @@ BI_CLOUD_SERVER *--> BI_PRIVATE_CLOUD
 BI_MANAGED_SERVER *--> BI_PRIVATE_CLOUD
 BI_MANAGED_WEBSPACE *--> BI_MANAGED_SERVER
 
-HA_CLOUD_SERVER ==* BI_CLOUD_SERVER
+HA_CLOUD_SERVER *==> BI_CLOUD_SERVER
-HA_MANAGED_SERVER ==* BI_MANAGED_SERVER
+HA_MANAGED_SERVER *==> BI_MANAGED_SERVER
-HA_MANAGED_WEBSPACE ==* BI_MANAGED_WEBSPACE
+HA_MANAGED_WEBSPACE *==> BI_MANAGED_WEBSPACE
 HA_MANAGED_WEBSPACE o..> HA_MANAGED_SERVER
 HA_UNIX_USER *==> HA_MANAGED_WEBSPACE
 HA_EMAIL_ALIAS *==> HA_MANAGED_WEBSPACE
@@ -196,4 +194,5 @@ package Legend #white {
 }
 Booking -down[hidden]->Legend
 ```
-    This code generated was by HsHostingAssetType.main, do not amend manually.
+
+This code generated was by HsHostingAssetType.main, do not amend manually.

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

@@ -0,0 +1,90 @@
+package net.hostsharing.hsadminng.hash;
+
+import java.security.SecureRandom;
+import java.util.Arrays;
+import java.util.PriorityQueue;
+import java.util.Queue;
+import java.util.function.BiFunction;
+import java.util.random.RandomGenerator;
+
+import lombok.Getter;
+
+/**
+ * Usage-example to generate hash:
+ *  HashGenerator.using(LINUX_SHA512).withRandomSalt().hash("plaintext password");
+ *
+ * Usage-example to verify hash:
+ *  HashGenerator.fromHash("hashed password).verify("plaintext password");
+ */
+@Getter
+public final class HashGenerator {
+
+    private static final RandomGenerator random = new SecureRandom();
+    private static final Queue<String> predefinedSalts = new PriorityQueue<>();
+
+    public static final int RANDOM_SALT_LENGTH = 16;
+    private static final String RANDOM_SALT_CHARACTERS =
+            "abcdefghijklmnopqrstuvwxyz" +
+                    "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
+                    "0123456789/.";
+
+    public enum Algorithm {
+        LINUX_SHA512(LinuxEtcShadowHashGenerator::hash, "6"),
+        LINUX_YESCRYPT(LinuxEtcShadowHashGenerator::hash, "y"),
+        MYSQL_NATIVE(MySQLNativePasswordHashGenerator::hash, "*"),
+        SCRAM_SHA256(PostgreSQLScramSHA256::hash, "SCRAM-SHA-256");
+
+        final BiFunction<HashGenerator, String, String> implementation;
+        final String prefix;
+
+        Algorithm(BiFunction<HashGenerator, String, String> implementation, final String prefix) {
+            this.implementation = implementation;
+            this.prefix = prefix;
+        }
+
+        static Algorithm byPrefix(final String prefix) {
+            return Arrays.stream(Algorithm.values()).filter(a -> a.prefix.equals(prefix)).findAny()
+                    .orElseThrow(() -> new IllegalArgumentException("unknown hash algorithm: '" + prefix + "'"));
+        }
+    }
+
+    private final Algorithm algorithm;
+    private String salt;
+
+    public static HashGenerator using(final Algorithm algorithm) {
+        return new HashGenerator(algorithm);
+    }
+
+    private HashGenerator(final Algorithm algorithm) {
+       this.algorithm = algorithm;
+    }
+
+    public String hash(final String plaintextPassword) {
+        if (plaintextPassword == null) {
+            throw new IllegalStateException("no password given");
+        }
+
+        return algorithm.implementation.apply(this, plaintextPassword);
+    }
+
+    public static void nextSalt(final String salt) {
+        predefinedSalts.add(salt);
+    }
+
+    public HashGenerator withSalt(final String salt) {
+        this.salt = salt;
+        return this;
+    }
+
+    public HashGenerator withRandomSalt() {
+        if (!predefinedSalts.isEmpty()) {
+            return withSalt(predefinedSalts.poll());
+        }
+        final var stringBuilder = new StringBuilder(RANDOM_SALT_LENGTH);
+        for (int i = 0; i < RANDOM_SALT_LENGTH; ++i) {
+            int randomIndex = random.nextInt(RANDOM_SALT_CHARACTERS.length());
+            stringBuilder.append(RANDOM_SALT_CHARACTERS.charAt(randomIndex));
+        }
+        return withSalt(stringBuilder.toString());
+    }
+}

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

@@ -1,107 +1,31 @@
 package net.hostsharing.hsadminng.hash;
 
-import java.security.SecureRandom;
-import java.util.Arrays;
-import java.util.PriorityQueue;
-import java.util.Queue;
-import java.util.random.RandomGenerator;
-
 import com.sun.jna.Library;
 import com.sun.jna.Native;
 
 public class LinuxEtcShadowHashGenerator {
 
-    private static final RandomGenerator random = new SecureRandom();
+    public static String hash(final HashGenerator generator, final String payload) {
-    private static final Queue<String> predefinedSalts = new PriorityQueue<>();
+        if (generator.getSalt() == null) {
-
-    public static final int SALT_LENGTH = 16;
-
-    private final String plaintextPassword;
-    private Algorithm algorithm;
-
-    public enum Algorithm {
-        SHA512("6"),
-        YESCRYPT("y");
-
-        final String prefix;
-
-        Algorithm(final String prefix) {
-            this.prefix = prefix;
-        }
-
-        static Algorithm byPrefix(final String prefix) {
-            return Arrays.stream(Algorithm.values()).filter(a -> a.prefix.equals(prefix)).findAny()
-                    .orElseThrow(() -> new IllegalArgumentException("unknown hash algorithm: '" + prefix + "'"));
-        }
-    }
-
-    private static final String SALT_CHARACTERS =
-                    "abcdefghijklmnopqrstuvwxyz" +
-                    "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
-                    "0123456789/.";
-
-    private String salt;
-
-    public static LinuxEtcShadowHashGenerator hash(final String plaintextPassword) {
-        return new LinuxEtcShadowHashGenerator(plaintextPassword);
-    }
-
-    private LinuxEtcShadowHashGenerator(final String plaintextPassword) {
-       this.plaintextPassword = plaintextPassword;
-    }
-
-    public LinuxEtcShadowHashGenerator using(final Algorithm algorithm) {
-        this.algorithm = algorithm;
-        return this;
-    }
-
-    void verify(final String givenHash) {
-        final var parts = givenHash.split("\\$");
-        if (parts.length < 3 || parts.length > 5) {
-            throw new IllegalArgumentException("not a " + algorithm.name() + " Linux hash: " + givenHash);
-        }
-
-        algorithm = Algorithm.byPrefix(parts[1]);
-        salt = parts.length == 4 ? parts[2] : parts[2] + "$" + parts[3];
-
-        if (!generate().equals(givenHash)) {
-            throw new IllegalArgumentException("invalid password");
-        }
-    }
-
-    public String generate() {
-        if (salt == null) {
             throw new IllegalStateException("no salt given");
         }
-        if (plaintextPassword == null) {
+
-            throw new IllegalStateException("no password given");
+        return NativeCryptLibrary.INSTANCE.crypt(payload, "$" + generator.getAlgorithm().prefix + "$" + generator.getSalt());
+    }
+
+    public static void verify(final String givenHash, final String payload) {
+
+        final var parts = givenHash.split("\\$");
+        if (parts.length < 3 || parts.length > 5) {
+            throw new IllegalArgumentException("hash with unknown hash method: " + givenHash);
         }
 
-        return NativeCryptLibrary.INSTANCE.crypt(plaintextPassword, "$" + algorithm.prefix + "$" + salt);
+        final var algorithm = HashGenerator.Algorithm.byPrefix(parts[1]);
-    }
+        final var salt = parts.length == 4 ? parts[2] : parts[2] + "$" + parts[3];
-
+        final var calcualatedHash = HashGenerator.using(algorithm).withSalt(salt).hash(payload);
-    public static void nextSalt(final String salt) {
+        if (!calcualatedHash.equals(givenHash)) {
-        predefinedSalts.add(salt);
+            throw new IllegalArgumentException("invalid password");
-    }
-
-    public LinuxEtcShadowHashGenerator withSalt(final String salt) {
-        this.salt = salt;
-        return this;
-    }
-
-    public LinuxEtcShadowHashGenerator withRandomSalt() {
-        if (!predefinedSalts.isEmpty()) {
-            return withSalt(predefinedSalts.poll());
         }
-        final var stringBuilder = new StringBuilder(SALT_LENGTH);
-        for (int i = 0; i < SALT_LENGTH; ++i) {
-            int randomIndex = random.nextInt(SALT_CHARACTERS.length());
-            stringBuilder.append(SALT_CHARACTERS.charAt(randomIndex));
-        }
-        return withSalt(stringBuilder.toString());
-    }
-    public static void main(String[] args) {
-        System.out.println(NativeCryptLibrary.INSTANCE.crypt("given password", "$6$abcdefghijklmno"));
     }
 
     public interface NativeCryptLibrary extends Library {

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

@@ -0,0 +1,35 @@
+package net.hostsharing.hsadminng.hash;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+public class MySQLNativePasswordHashGenerator {
+
+    public static String hash(final HashGenerator generator, final String password) {
+        // TODO.impl: if a random salt is generated or not should be part of the algorithm definition
+//        if (generator.getSalt() != null) {
+//            throw new IllegalStateException("salt not supported");
+//        }
+
+        try {
+            final var sha1 = MessageDigest.getInstance("SHA-1");
+            final var firstHash = sha1.digest(password.getBytes());
+            final var secondHash = sha1.digest(firstHash);
+            return "*" + bytesToHex(secondHash).toUpperCase();
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException("SHA-1 algorithm not found", e);
+        }
+    }
+
+    private static String bytesToHex(byte[] bytes) {
+        final var hexString = new StringBuilder();
+        for (byte b : bytes) {
+            final var hex = Integer.toHexString(0xff & b);
+            if (hex.length() == 1) {
+                hexString.append('0');
+            }
+            hexString.append(hex);
+        }
+        return hexString.toString();
+    }
+}

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),
+            requiredParent(MANAGED_WEBSPACE), // thus, the MANAGED_WEBSPACE:Agent becomes RBAC owner
-            assignedTo(MANAGED_WEBSPACE)),
+            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?
+            requiredParent(PGSQL_USER)), // thus, the PGSQL_USER_USER:Agent becomes RBAC owner
-            assignedTo(PGSQL_INSTANCE)), // TODO.spec: or swapping parent+assignedTo?
 
     MARIADB_INSTANCE( // TODO.spec: identifier to be specified
             inGroup("MariaDB"),
@@ -100,13 +99,12 @@ public enum HsHostingAssetType implements Node {
 
     MARIADB_USER( // named e.g. xyz00_abc
             inGroup("MariaDB"),
-            requiredParent(MARIADB_INSTANCE),
+            requiredParent(MANAGED_WEBSPACE), // thus, the MANAGED_WEBSPACE:Agent becomes RBAC owner
-            assignedTo(MANAGED_WEBSPACE)),
+            assignedTo(MARIADB_INSTANCE)),
 
     MARIADB_DATABASE( // named e.g. xyz00_abc
             inGroup("MariaDB"),
-            requiredParent(MANAGED_WEBSPACE), // TODO.spec: or MARIADB_USER?
+            requiredParent(MARIADB_USER)), // thus, the MARIADB_USER:Agent becomes RBAC owner
-            assignedTo(MARIADB_INSTANCE)), // TODO.spec: or swapping parent+assignedTo?
 
     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

@@ -26,6 +26,12 @@ public class HostingAssetEntityValidatorRegistry {
         register(DOMAIN_SMTP_SETUP, new HsDomainSmtpSetupHostingAssetValidator());
         register(DOMAIN_MBOX_SETUP, new HsDomainMboxSetupHostingAssetValidator());
         register(EMAIL_ADDRESS, new HsEMailAddressHostingAssetValidator());
+        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

@@ -0,0 +1,25 @@
+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.MARIADB_DATABASE;
+import static net.hostsharing.hsadminng.hs.validation.StringProperty.stringProperty;
+
+class HsMariaDbDatabaseHostingAssetValidator extends HostingAssetEntityValidator {
+
+    public HsMariaDbDatabaseHostingAssetValidator() {
+        super(
+                MARIADB_DATABASE,
+                AlarmContact.isOptional(),
+
+                stringProperty("encoding").matchesRegEx("[a-z0-9_]+").maxLength(24).provided("latin1", "utf8").withDefault("utf8"));
+    }
+
+    @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/HsMariaDbInstanceHostingAssetValidator.java

@@ -0,0 +1,37 @@
+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.MARIADB_INSTANCE;
+
+class HsMariaDbInstanceHostingAssetValidator extends HostingAssetEntityValidator {
+
+    final static String DEFAULT_INSTANCE_IDENTIFIER_SUFFIX = "|MariaDB.default"; // TODO.spec: specify instance naming
+
+    public HsMariaDbInstanceHostingAssetValidator() {
+        super(
+                MARIADB_INSTANCE,
+                AlarmContact.isOptional(),
+                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/HsMariaDbUserHostingAssetValidator.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.MARIADB_USER;
+import static net.hostsharing.hsadminng.hs.validation.PasswordProperty.passwordProperty;
+
+class HsMariaDbUserHostingAssetValidator extends HostingAssetEntityValidator {
+
+    public HsMariaDbUserHostingAssetValidator() {
+        super(
+                MARIADB_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.MYSQL_NATIVE).writeOnly());
+    }
+
+    @Override
+    protected Pattern identifierPattern(final HsHostingAssetEntity assetEntity) {
+        final var webspaceIdentifier = assetEntity.getParentAsset().getIdentifier();
+        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/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsUnixUserHostingAssetValidator.java

@@ -1,6 +1,6 @@
 package net.hostsharing.hsadminng.hs.hosting.asset.validators;
 
-import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator;
+import net.hostsharing.hsadminng.hash.HashGenerator;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
 import net.hostsharing.hsadminng.hs.validation.PropertiesProvider;
@@ -30,7 +30,8 @@ class HsUnixUserHostingAssetValidator extends HostingAssetEntityValidator {
                         .withDefault("/bin/false"),
                 stringProperty("homedir").readOnly().computedBy(HsUnixUserHostingAssetValidator::computeHomedir),
                 stringProperty("totpKey").matchesRegEx("^0x([0-9A-Fa-f]{2})+$").minLength(20).maxLength(256).undisclosed().writeOnly().optional(),
-                passwordProperty("password").minLength(8).maxLength(40).hashedUsing(LinuxEtcShadowHashGenerator.Algorithm.SHA512).writeOnly());
+                passwordProperty("password").minLength(8).maxLength(40).hashedUsing(HashGenerator.Algorithm.LINUX_SHA512).writeOnly());
+                // TODO.spec: public SSH keys?
     }
 
     @Override

src/main/java/net/hostsharing/hsadminng/hs/validation/PasswordProperty.java

@@ -1,13 +1,13 @@
 package net.hostsharing.hsadminng.hs.validation;
 
-import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.Algorithm;
+import net.hostsharing.hsadminng.hash.HashGenerator;
+import net.hostsharing.hsadminng.hash.HashGenerator.Algorithm;
 import lombok.Setter;
 
 import java.util.List;
 import java.util.stream.Stream;
 
 import static java.util.Optional.ofNullable;
-import static net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.hash;
 import static net.hostsharing.hsadminng.mapper.Array.insertNewEntriesAfterExistingEntry;
 
 @Setter
@@ -36,7 +36,7 @@ public class PasswordProperty extends StringProperty<PasswordProperty> {
         this.hashedUsing = algorithm;
         computedBy((entity)
                 -> ofNullable(entity.getDirectValue(propertyName, String.class))
-                    .map(password -> hash(password).using(algorithm).withRandomSalt().generate())
+                    .map(password -> HashGenerator.using(algorithm).withRandomSalt().hash(password))
                     .orElse(null));
         return self();
     }

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

@@ -17,8 +17,10 @@ components:
                 - DOMAIN_MBOX_SETUP
                 - EMAIL_ALIAS
                 - EMAIL_ADDRESS
+                - PGSQL_INSTANCE
                 - PGSQL_USER
                 - PGSQL_DATABASE
+                - MARIADB_INSTANCE
                 - MARIADB_USER
                 - MARIADB_DATABASE
 

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

@@ -16,8 +16,10 @@ create type HsHostingAssetType as enum (
     'DOMAIN_MBOX_SETUP',
     'EMAIL_ALIAS',
     'EMAIL_ADDRESS',
+    'PGSQL_INSTANCE',
     'PGSQL_USER',
     'PGSQL_DATABASE',
+    'MARIADB_INSTANCE',
     'MARIADB_USER',
     'MARIADB_DATABASE'
 );
@@ -47,6 +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 $$
@@ -72,10 +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 'MANAGED_WEBSPACE'
-        when 'MARIADB_DATABASE' 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

@@ -25,6 +25,10 @@ declare
     webUnixUserUuid                     uuid;
     domainSetupUuid                     uuid;
     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');
@@ -69,22 +73,33 @@ begin
     select uuid_generate_v4() into webUnixUserUuid;
     select uuid_generate_v4() into domainSetupUuid;
     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;
 
     insert into hs_hosting_asset
-           (uuid,                   bookingitemuuid,        type,                parentAssetUuid,     assignedToAssetUuid,   identifier,                                    caption,                     config)
+       (uuid,                   bookingitemuuid,        type,                parentAssetUuid,     assignedToAssetUuid,   identifier,                                         caption,                        config)
-           values (managedServerUuid,      managedServerBI.uuid,   'MANAGED_SERVER',    null,                null,                  'vm10' || debitorNumberSuffix,                 'some ManagedServer',        '{ "monit_max_cpu_usage": 90, "monit_max_ram_usage": 80, "monit_max_ssd_usage": 70 }'::jsonb),
+       values
-                  (uuid_generate_v4(),     cloudServerBI.uuid,     'CLOUD_SERVER',      null,                null,                  'vm20' || debitorNumberSuffix,                 'another CloudServer',       '{}'::jsonb),
+       (managedServerUuid,      managedServerBI.uuid,   'MANAGED_SERVER',    null,                null,                  'vm10' || debitorNumberSuffix,                       'some ManagedServer',           '{ "monit_max_cpu_usage": 90, "monit_max_ram_usage": 80, "monit_max_ssd_usage": 70 }'::jsonb),
-                  (managedWebspaceUuid,    managedWebspaceBI.uuid, 'MANAGED_WEBSPACE',  managedServerUuid,   null,                  defaultPrefix || '01',                         'some Webspace',             '{}'::jsonb),
+       (uuid_generate_v4(),     cloudServerBI.uuid,     'CLOUD_SERVER',      null,                null,                  'vm20' || debitorNumberSuffix,                       'another CloudServer',          '{}'::jsonb),
-                  (uuid_generate_v4(),     null,                   'EMAIL_ALIAS',       managedWebspaceUuid, null,                  defaultPrefix || '01-web',                     'some E-Mail-Alias',         '{ "target": [ "office@example.org", "archive@example.com" ] }'::jsonb),
+       (managedWebspaceUuid,    managedWebspaceBI.uuid, 'MANAGED_WEBSPACE',  managedServerUuid,   null,                  defaultPrefix || '01',                               'some Webspace',                '{}'::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),
+       (mariaDbInstanceUuid,    null,                   'MARIADB_INSTANCE',  managedServerUuid,   null,                  'vm10' || debitorNumberSuffix || '.MariaDB.default', 'some default MariaDB instance','{}'::jsonb),
-                  (domainSetupUuid,        null,                   'DOMAIN_SETUP',      null,                null,                  defaultPrefix || '.example.org',               'some Domain-Setup',         '{}'::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,                   'DOMAIN_DNS_SETUP',  domainSetupUuid,     null,                  defaultPrefix || '.example.org|DNS',           'some Domain-DNS-Setup',     '{}'::jsonb),
+       (uuid_generate_v4(),     null,                   'MARIADB_DATABASE',  mariaDbUserUuid,     mariaDbInstanceUuid,   defaultPrefix || '01_web',                           'some default MariaDB database','{ "encryption": "utf8", "collation": "utf8"}'::jsonb ),
-                  (uuid_generate_v4(),     null,                   'DOMAIN_HTTP_SETUP', domainSetupUuid,     webUnixUserUuid,       defaultPrefix || '.example.org|HTTP',          'some Domain-HTTP-Setup',    '{ "option-htdocsfallback": true, "use-fcgiphpbin": "/usr/lib/cgi-bin/php", "validsubdomainnames": "*"}'::jsonb),
+       (pgSqlInstanceUuid,      null,                   'PGSQL_INSTANCE',    managedServerUuid,   null,                  'vm10' || debitorNumberSuffix || '.Postgresql.default', 'some default Postgresql instance','{}'::jsonb),
-                  (uuid_generate_v4(),     null,                   'DOMAIN_SMTP_SETUP', domainSetupUuid,     managedWebspaceUuid,   defaultPrefix || '.example.org|DNS',           'some Domain-SMPT-Setup',    '{}'::jsonb),
+       (PgSqlUserUuid,          null,                   'PGSQL_USER',        managedWebspaceUuid, pgSqlInstanceUuid,     defaultPrefix || '01_web',                           'some default Postgresql user',    '{ "password": "<TODO:replace-by-encrypted-postgresql-password"}'::jsonb ),
-                  (domainMBoxSetupUuid,    null,                   'DOMAIN_MBOX_SETUP', domainSetupUuid,     managedWebspaceUuid,   defaultPrefix || '.example.org|DNS',           'some Domain-MBOX-Setup',    '{}'::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_ADDRESS',     domainMBoxSetupUuid, null,                  'test@' || defaultPrefix || '.example.org',    'some E-Mail-Address',       '{}'::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),
+       (uuid_generate_v4(),     null,                   'DOMAIN_DNS_SETUP',  domainSetupUuid,     null,                  defaultPrefix || '.example.org|DNS',                 'some Domain-DNS-Setup',        '{}'::jsonb),
+       (uuid_generate_v4(),     null,                   'DOMAIN_HTTP_SETUP', domainSetupUuid,     webUnixUserUuid,       defaultPrefix || '.example.org|HTTP',                'some Domain-HTTP-Setup',       '{ "option-htdocsfallback": true, "use-fcgiphpbin": "/usr/lib/cgi-bin/php", "validsubdomainnames": "*"}'::jsonb),
+       (uuid_generate_v4(),     null,                   'DOMAIN_SMTP_SETUP', domainSetupUuid,     managedWebspaceUuid,   defaultPrefix || '.example.org|DNS',                 'some Domain-SMPT-Setup',       '{}'::jsonb),
+       (domainMBoxSetupUuid,    null,                   'DOMAIN_MBOX_SETUP', domainSetupUuid,     managedWebspaceUuid,   defaultPrefix || '.example.org|DNS',                 'some Domain-MBOX-Setup',       '{}'::jsonb),
+       (uuid_generate_v4(),     null,                   'EMAIL_ADDRESS',     domainMBoxSetupUuid, null,                  'test@' || defaultPrefix || '.example.org',          'some E-Mail-Address',          '{}'::jsonb);
 end; $$;
 --//
 

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

@@ -0,0 +1,77 @@
+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;
+
+class HashGeneratorUnitTest {
+
+    final String GIVEN_PASSWORD = "given password";
+    final String WRONG_PASSWORD = "wrong password";
+    final String GIVEN_SALT = "0123456789abcdef";
+
+    // generated via mkpasswd for plaintext password GIVEN_PASSWORD (see above)
+    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==$4vsB1OddRNdsej9NPAFh91MPdtbOPjkQ85LQZS5lV0Q=:NsVpQNx4Ic/8Sqj1dxfBzUAxyF4FCTMpIsI+bOZCTfA=";
+
+    @Test
+    void verifiesLinuxPasswordAgainstSha512HashFromMkpasswd() {
+        LinuxEtcShadowHashGenerator.verify(GIVEN_LINUX_GENERATED_SHA512_HASH, GIVEN_PASSWORD); // throws exception if wrong
+    }
+
+    @Test
+    void verifiesLinuxPasswordAgainstYescryptHashFromMkpasswd() {
+        LinuxEtcShadowHashGenerator.verify(GIVEN_LINUX_GENERATED_YESCRYPT_HASH, GIVEN_PASSWORD); // throws exception if wrong
+    }
+
+    @Test
+    void verifiesHashedLinuxPasswordWithRandomSalt() {
+        final var hash = HashGenerator.using(LINUX_SHA512).withRandomSalt().hash(GIVEN_PASSWORD);
+        LinuxEtcShadowHashGenerator.verify(hash, GIVEN_PASSWORD); // throws exception if wrong
+    }
+
+    @Test
+    void verifiesLinuxHashedPasswordWithGivenSalt() {
+        final var hash = HashGenerator.using(LINUX_SHA512).withSalt(GIVEN_SALT).hash(GIVEN_PASSWORD);
+        LinuxEtcShadowHashGenerator.verify(hash, GIVEN_PASSWORD); // throws exception if wrong
+    }
+
+    @Test
+    void throwsExceptionForInvalidLinuxPassword() {
+        final var hash = HashGenerator.using(LINUX_SHA512).withRandomSalt().hash(GIVEN_PASSWORD);
+        final var throwable = catchThrowable(() ->
+                LinuxEtcShadowHashGenerator.verify(hash, WRONG_PASSWORD)
+        );
+        assertThat(throwable).hasMessage("invalid password");
+    }
+
+    @Test
+    void generatesMySqlNativePasswordHash() {
+        final var hash = HashGenerator.using(MYSQL_NATIVE).hash("Test1234");
+        assertThat(hash).isEqualTo("*14F1A8C42F8B6D4662BB3ED290FD37BF135FE45C");
+    }
+
+    @Test
+    void generatePostgreSqlScramPasswordHash() {
+        // given the same salt, extracted from the hash as generated by PostgreSQL
+        final var postgresBase64Salt = Base64.getDecoder().decode(GIVEN_POSTGRESQL_GENERATED_SCRAM_SHA256_HASH.split("\\$")[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/hash/LinuxEtcShadowHashGeneratorUnitTest.java

@@ -1,51 +0,0 @@
-package net.hostsharing.hsadminng.hash;
-
-import org.junit.jupiter.api.Test;
-
-import static net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.Algorithm.SHA512;
-import static net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.hash;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.catchThrowable;
-
-class LinuxEtcShadowHashGeneratorUnitTest {
-
-    final String GIVEN_PASSWORD = "given password";
-    final String WRONG_PASSWORD = "wrong password";
-    final String GIVEN_SALT = "0123456789abcdef";
-
-    // generated via mkpasswd for plaintext password GIVEN_PASSWORD (see above)
-    final String GIVEN_SHA512_HASH = "$6$ooei1HK6JXVaI7KC$sY5d9fEOr36hjh4CYwIKLMfRKL1539bEmbVCZ.zPiH0sv7jJVnoIXb5YEefEtoSM2WWgDi9hr7vXRe3Nw8zJP/";
-    final String GIVEN_YESCRYPT_HASH = "$y$j9T$wgYACPmBXvlMg2MzeZA0p1$KXUzd28nG.67GhPnBZ3aZsNNA5bWFdL/dyG4wS0iRw7";
-
-    @Test
-    void verifiesPasswordAgainstSha512HashFromMkpasswd() {
-        hash(GIVEN_PASSWORD).verify(GIVEN_SHA512_HASH); // throws exception if wrong
-    }
-
-    @Test
-    void verifiesPasswordAgainstYescryptHashFromMkpasswd() {
-        hash(GIVEN_PASSWORD).verify(GIVEN_YESCRYPT_HASH); // throws exception if wrong
-    }
-
-    @Test
-    void verifiesHashedPasswordWithRandomSalt() {
-        final var hash = hash(GIVEN_PASSWORD).using(SHA512).withRandomSalt().generate();
-        hash(GIVEN_PASSWORD).verify(hash); // throws exception if wrong
-    }
-
-    @Test
-    void verifiesHashedPasswordWithGivenSalt() {
-        final var givenPasswordHash =hash(GIVEN_PASSWORD).using(SHA512).withSalt(GIVEN_SALT).generate();
-        hash(GIVEN_PASSWORD).verify(givenPasswordHash); // throws exception if wrong
-    }
-
-    @Test
-    void throwsExceptionForInvalidPassword() {
-        final var givenPasswordHash = hash(GIVEN_PASSWORD).using(SHA512).withRandomSalt().generate();
-
-        final var throwable = catchThrowable(() ->
-                hash(WRONG_PASSWORD).verify(givenPasswordHash) // throws exception if wrong);
-        );
-        assertThat(throwable).hasMessage("invalid password");
-    }
-}

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

@@ -3,7 +3,7 @@ package net.hostsharing.hsadminng.hs.hosting.asset;
 import io.restassured.RestAssured;
 import io.restassured.http.ContentType;
 import net.hostsharing.hsadminng.HsadminNgApplication;
-import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator;
+import net.hostsharing.hsadminng.hash.HashGenerator;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemRepository;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
@@ -537,7 +537,7 @@ class HsHostingAssetControllerAcceptanceTest extends ContextBasedTestWithCleanup
                             .identifier("fir01-temp")
                             .caption("some test-unix-user")
                             .build());
-            LinuxEtcShadowHashGenerator.nextSalt("Jr5w/Y8zo8pCkqg7");
+            HashGenerator.nextSalt("Jr5w/Y8zo8pCkqg7");
 
             RestAssured // @formatter:off
                     .given()

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

@@ -30,6 +30,7 @@ import java.util.Map;
 import static java.util.Map.entry;
 import static net.hostsharing.hsadminng.hs.booking.item.TestHsBookingItem.TEST_CLOUD_SERVER_BOOKING_ITEM;
 import static net.hostsharing.hsadminng.hs.booking.item.TestHsBookingItem.TEST_MANAGED_SERVER_BOOKING_ITEM;
+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.hs.office.contact.TestHsOfficeContact.TEST_CONTACT;
 import static net.hostsharing.hsadminng.rbac.test.JsonMatcher.lenientlyEquals;
@@ -363,6 +364,130 @@ public class HsHostingAssetControllerRestTest {
                             }
                         }
                     ]
+                """),
+        MARIADB_INSTANCE(
+                List.of(
+                        HsHostingAssetEntity.builder()
+                                .type(HsHostingAssetType.MARIADB_INSTANCE)
+                                .parentAsset(TEST_MANAGED_SERVER_HOSTING_ASSET)
+                                .identifier("vm1234|MariaDB.default")
+                                .caption("some fake MariaDB instance")
+                                .build()),
+                """
+                    [
+                        {
+                            "type": "MARIADB_INSTANCE",
+                            "identifier": "vm1234|MariaDB.default",
+                            "caption": "some fake MariaDB instance",
+                            "alarmContact": null,
+                            "config": {}
+                        }
+                    ]
+                """),
+        MARIADB_USER(
+                List.of(
+                        HsHostingAssetEntity.builder()
+                                .type(HsHostingAssetType.MARIADB_USER)
+                                .identifier("xyz00_temp")
+                                .caption("some fake MariaDB user")
+                                .build()),
+                """
+                    [
+                        {
+                            "type": "MARIADB_USER",
+                            "identifier": "xyz00_temp",
+                            "caption": "some fake MariaDB user",
+                            "alarmContact": null,
+                            "config": {}
+                        }
+                    ]
+                """),
+        MARIADB_DATABASE(
+                List.of(
+                        HsHostingAssetEntity.builder()
+                                .type(HsHostingAssetType.MARIADB_DATABASE)
+                                .identifier("xyz00_temp")
+                                .caption("some fake MariaDB database")
+                                .config(Map.ofEntries(
+                                        entry("encoding", "latin1"),
+                                        entry("collation", "latin2")
+                                ))
+                                .build()),
+                """
+                    [
+                        {
+                            "type": "MARIADB_DATABASE",
+                            "identifier": "xyz00_temp",
+                            "caption": "some fake MariaDB database",
+                            "alarmContact": null,
+                            "config": {
+                                "encoding": "latin1",
+                                "collation": "latin2"
+                            }
+                        }
+                    ]
+                """),
+        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

@@ -41,7 +41,13 @@ class HsHostingAssetPropsControllerAcceptanceTest {
                             "DOMAIN_HTTP_SETUP",
                             "DOMAIN_SMTP_SETUP",
                             "DOMAIN_MBOX_SETUP",
-                            "EMAIL_ADDRESS"
+                            "EMAIL_ADDRESS",
+                            "MARIADB_INSTANCE",
+                            "MARIADB_USER",
+                            "MARIADB_DATABASE",
+                            "PGSQL_INSTANCE",
+                            "PGSQL_USER",
+                            "PGSQL_DATABASE"
                         ]
                         """));
         // @formatter:on

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

@@ -245,7 +245,9 @@ class HsHostingAssetRepositoryIntegrationTest extends ContextBasedTestWithCleanu
             // then
             exactlyTheseAssetsAreReturned(
                     result,
-                    "HsHostingAssetEntity(MANAGED_WEBSPACE, sec01, some Webspace, MANAGED_SERVER:vm1012, D-1000212:D-1000212 default project:separate ManagedWebspace)");
+                    "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(PGSQL_INSTANCE, vm1012.Postgresql.default, some default Postgresql instance, MANAGED_SERVER:vm1012)");
         }
     }
 

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

@@ -36,13 +36,13 @@ class HsHostingAssetTypeUnitTest {
                         entity HA_DOMAIN_MBOX_SETUP
                         entity HA_EMAIL_ADDRESS
                     }
-                
+
                     package Server #99bcdb {
                         entity HA_CLOUD_SERVER
                         entity HA_MANAGED_SERVER
                         entity HA_IP_NUMBER
                     }
-                
+
                     package Webspace #99bcdb {
                         entity HA_MANAGED_WEBSPACE
                         entity HA_UNIX_USER
@@ -129,10 +129,9 @@ class HsHostingAssetTypeUnitTest {
                 HA_UNIX_USER *==> HA_MANAGED_WEBSPACE
                 HA_EMAIL_ALIAS *==> HA_MANAGED_WEBSPACE
                 HA_MARIADB_INSTANCE *==> HA_MANAGED_SERVER
-                HA_MARIADB_USER *==> HA_MARIADB_INSTANCE
+                HA_MARIADB_USER *==> HA_MANAGED_WEBSPACE
-                HA_MARIADB_USER o..> HA_MANAGED_WEBSPACE
+                HA_MARIADB_USER o..> HA_MARIADB_INSTANCE
-                HA_MARIADB_DATABASE *==> HA_MANAGED_WEBSPACE
+                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
@@ -145,7 +144,7 @@ class HsHostingAssetTypeUnitTest {
                 }
                 Booking -down[hidden]->Legend
                 ```
-                
+
                 ### PostgreSQL
 
                 ```plantuml
@@ -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 *==> HA_MANAGED_WEBSPACE
-                HA_PGSQL_USER o..> HA_MANAGED_WEBSPACE
+                HA_PGSQL_USER o..> HA_PGSQL_INSTANCE
-                HA_PGSQL_DATABASE *==> HA_MANAGED_WEBSPACE
+                HA_PGSQL_DATABASE *==> HA_PGSQL_USER
-                HA_PGSQL_DATABASE o..> HA_PGSQL_INSTANCE
                 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

@@ -39,7 +39,13 @@ class HostingAssetEntityValidatorRegistryUnitTest {
                 HsHostingAssetType.DOMAIN_HTTP_SETUP,
                 HsHostingAssetType.DOMAIN_SMTP_SETUP,
                 HsHostingAssetType.DOMAIN_MBOX_SETUP,
-                HsHostingAssetType.EMAIL_ADDRESS
+                HsHostingAssetType.EMAIL_ADDRESS,
+                HsHostingAssetType.MARIADB_INSTANCE,
+                HsHostingAssetType.MARIADB_USER,
+                HsHostingAssetType.MARIADB_DATABASE,
+                HsHostingAssetType.PGSQL_INSTANCE,
+                HsHostingAssetType.PGSQL_USER,
+                HsHostingAssetType.PGSQL_DATABASE
         );
     }
 }

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

@@ -0,0 +1,116 @@
+package net.hostsharing.hsadminng.hs.hosting.asset.validators;
+
+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.MARIADB_DATABASE;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.MARIADB_INSTANCE;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.MARIADB_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 HsMariaDbDatabaseHostingAssetValidatorUnitTest {
+
+    private static final HsHostingAssetEntity GIVEN_MARIADB_INSTANCE = HsHostingAssetEntity.builder()
+            .type(MARIADB_INSTANCE)
+            .parentAsset(TEST_MANAGED_SERVER_HOSTING_ASSET)
+            .identifier("vm1234|MariaDB.default")
+            .caption("some valid test MariaDB-Instance")
+            .build();
+
+    private static final HsHostingAssetEntity GIVEN_MARIADB_USER = HsHostingAssetEntity.builder()
+            .type(MARIADB_USER)
+            .parentAsset(TEST_MANAGED_WEBSPACE_HOSTING_ASSET)
+            .assignedToAsset(GIVEN_MARIADB_INSTANCE)
+            .identifier("xyz00_temp")
+            .caption("some valid test MariaDB-User")
+            .config(new HashMap<>(ofEntries(
+                    entry("password", "Hallo Datenbank, lass mich rein!")
+            )))
+            .build();
+
+    private static HsHostingAssetEntityBuilder givenValidMariaDbDatabaseBuilder() {
+        return HsHostingAssetEntity.builder()
+                .type(MARIADB_DATABASE)
+                .parentAsset(GIVEN_MARIADB_USER)
+                .identifier("xyz00_temp")
+                .caption("some valid test MariaDB-Database")
+                .config(new HashMap<>(ofEntries(
+                        entry("encoding", "latin1")
+                )));
+    }
+
+    @Test
+    void describesItsProperties() {
+        // given
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenValidMariaDbDatabaseBuilder().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 givenMariaDbUserHostingAsset = givenValidMariaDbDatabaseBuilder().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 = givenValidMariaDbDatabaseBuilder()
+                .config(ofEntries(
+                        entry("unknown", "wrong"),
+                        entry("encoding", 10)
+                ))
+                .build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenMariaDbUserHostingAsset.getType());
+
+        // when
+        final var result = validator.validateEntity(givenMariaDbUserHostingAsset);
+
+        // then
+        assertThat(result).containsExactlyInAnyOrder(
+                "'MARIADB_DATABASE:xyz00_temp.config.unknown' is not expected but is set to 'wrong'",
+                "'MARIADB_DATABASE:xyz00_temp.config.encoding' is expected to be of type String, but is of type Integer"
+        );
+    }
+
+    @Test
+    void rejectsInvalidIdentifier() {
+        // given
+        final var givenMariaDbUserHostingAsset = givenValidMariaDbDatabaseBuilder()
+                .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'");
+    }
+}

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

@@ -0,0 +1,122 @@
+package net.hostsharing.hsadminng.hs.hosting.asset.validators;
+
+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.MARIADB_INSTANCE;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.MARIADB_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 HsMariaDbUserHostingAssetValidatorUnitTest {
+
+    private static final HsHostingAssetEntity GIVEN_MARIADB_INSTANCE = HsHostingAssetEntity.builder()
+            .type(MARIADB_INSTANCE)
+            .parentAsset(TEST_MANAGED_SERVER_HOSTING_ASSET)
+            .identifier("vm1234|MariaDB.default")
+            .caption("some valid test MariaDB-Instance")
+            .build();
+
+    private static HsHostingAssetEntityBuilder givenValidMariaDbUserBuilder() {
+        return HsHostingAssetEntity.builder()
+                .type(MARIADB_USER)
+                .parentAsset(TEST_MANAGED_WEBSPACE_HOSTING_ASSET)
+                .assignedToAsset(GIVEN_MARIADB_INSTANCE)
+                .identifier("xyz00_temp")
+                .caption("some valid test MariaDB-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=MYSQL_NATIVE, undisclosed=true}"
+        );
+    }
+
+    @Test
+    void preparesEntity() {
+        // given
+        final var givenMariaDbUserHostingAsset = givenValidMariaDbUserBuilder().build();
+        final var validator = HostingAssetEntityValidatorRegistry.forType(givenMariaDbUserHostingAsset.getType());
+
+        // when
+        // HashGenerator.nextSalt("Ly3LbsArtL5u4EVt"); // not needed for mysql_native_password
+        validator.prepareProperties(givenMariaDbUserHostingAsset);
+
+        // then
+        assertThat(givenMariaDbUserHostingAsset.getConfig()).containsExactlyInAnyOrderEntriesOf(ofEntries(
+                entry("password", "*14F1A8C42F8B6D4662BB3ED290FD37BF135FE45C")
+        ));
+    }
+
+    @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(
+                "'MARIADB_USER:xyz00_temp.config.unknown' is not expected but is set to '100'",
+                "'MARIADB_USER:xyz00_temp.config.password' length is expected to be at min 8 but length of provided value is 5",
+                "'MARIADB_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'");
+    }
+}

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'");
+    }
+}

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

@@ -1,6 +1,6 @@
 package net.hostsharing.hsadminng.hs.hosting.asset.validators;
 
-import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator;
+import net.hostsharing.hsadminng.hash.HashGenerator;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
 import org.junit.jupiter.api.Test;
@@ -50,7 +50,7 @@ class HsUnixUserHostingAssetValidatorUnitTest {
         final var validator = HostingAssetEntityValidatorRegistry.forType(unixUserHostingAsset.getType());
 
         // when
-        LinuxEtcShadowHashGenerator.nextSalt("Ly3LbsArtL5u4EVt");
+        HashGenerator.nextSalt("Ly3LbsArtL5u4EVt");
         validator.prepareProperties(unixUserHostingAsset);
 
         // then
@@ -141,7 +141,7 @@ class HsUnixUserHostingAssetValidatorUnitTest {
         final var validator = HostingAssetEntityValidatorRegistry.forType(unixUserHostingAsset.getType());
 
         // when
-        LinuxEtcShadowHashGenerator.nextSalt("Ly3LbsArtL5u4EVt");
+        HashGenerator.nextSalt("Ly3LbsArtL5u4EVt");
         final var result = validator.revampProperties(unixUserHostingAsset, unixUserHostingAsset.getConfig());
 
         // then
@@ -169,7 +169,7 @@ class HsUnixUserHostingAssetValidatorUnitTest {
                 "{type=enumeration, propertyName=shell, values=[/bin/false, /bin/bash, /bin/csh, /bin/dash, /usr/bin/tcsh, /usr/bin/zsh, /usr/bin/passwd], defaultValue=/bin/false}",
                 "{type=string, propertyName=homedir, readOnly=true, computed=true}",
                 "{type=string, propertyName=totpKey, matchesRegEx=[^0x([0-9A-Fa-f]{2})+$], minLength=20, maxLength=256, writeOnly=true, undisclosed=true}",
-                "{type=password, propertyName=password, minLength=8, maxLength=40, writeOnly=true, computed=true, hashedUsing=SHA512, undisclosed=true}"
+                "{type=password, propertyName=password, minLength=8, maxLength=40, writeOnly=true, computed=true, hashedUsing=LINUX_SHA512, undisclosed=true}"
         );
     }
 }

src/test/java/net/hostsharing/hsadminng/hs/validation/PasswordPropertyUnitTest.java

@@ -1,5 +1,6 @@
 package net.hostsharing.hsadminng.hs.validation;
 
+import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ValueSource;
@@ -8,8 +9,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 
-import static net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.Algorithm.SHA512;
+import static net.hostsharing.hsadminng.hash.HashGenerator.Algorithm.LINUX_SHA512;
-import static net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.hash;
 import static net.hostsharing.hsadminng.hs.validation.PasswordProperty.passwordProperty;
 import static net.hostsharing.hsadminng.mapper.PatchableMapWrapper.entry;
 import static org.assertj.core.api.Assertions.assertThat;
@@ -17,7 +17,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 class PasswordPropertyUnitTest {
 
     private final ValidatableProperty<PasswordProperty, String> passwordProp =
-            passwordProperty("password").minLength(8).maxLength(40).hashedUsing(SHA512).writeOnly();
+            passwordProperty("password").minLength(8).maxLength(40).hashedUsing(LINUX_SHA512).writeOnly();
     private final List<String> violations = new ArrayList<>();
 
     @ParameterizedTest
@@ -115,6 +115,6 @@ class PasswordPropertyUnitTest {
         });
 
         // then
-        hash("some password").using(SHA512).withRandomSalt().generate(); // throws exception if wrong
+        LinuxEtcShadowHashGenerator.verify(result, "some password"); // throws exception if wrong
     }
 }