feat: initial GoMicro modelling

Author: GeekMasher

go/ql/lib/semmle/go/frameworks/GoMicro.qll

@@ -0,0 +1,116 @@
+import go
+
+module GoMicro {
+  class GoMicroServerType extends Type {
+    GoMicroServerType() { this.hasQualifiedName("go-micro.dev/v4/server", "Server") }
+  }
+
+  /**
+   * A file that is generated by the protobuf compiler.
+   */
+  class ProtocGeneratedFile extends File {
+    ProtocGeneratedFile() {
+      exists(string prefix, File f |
+        prefix = this.getBaseName().regexpCapture("^(.*)\\.pb(\\.micro)?\\.go$", 1) and
+        this.getParentContainer() = f.getParentContainer()
+      )
+    }
+  }
+
+  /**
+   * A type that is generated by the protobuf compiler.
+   */
+  class ProtocMessageType extends Type {
+    ProtocMessageType() {
+      exists(TypeEntity te |
+        te.getType() = this and
+        te.getDeclaration().getLocation().getFile() instanceof ProtocGeneratedFile and
+        exists(MethodDecl md |
+          md.getName() = "ProtoMessage" and
+          this = md.getReceiverDecl().getTypeExpr().getAChild().(TypeName).getType()
+        )
+      )
+    }
+
+    override string getName() { result = this.getUnderlyingType().getName() }
+  }
+
+  /**
+   * Server internal
+   */
+  class ServiceInterfaceType extends InterfaceType {
+    NamedType namedType;
+
+    ServiceInterfaceType() {
+      exists(TypeEntity te |
+        te.getType() = namedType and
+        namedType.getUnderlyingType() = this and
+        te.getDeclaration().getLocation().getFile() instanceof ProtocGeneratedFile
+      )
+    }
+
+    /**
+     * Gets the name of the interface.
+     */
+    override string getName() { result = namedType.getName() }
+
+    /**
+     * Gets the named type on top of this interface type.
+     */
+    NamedType getNamedType() { result = namedType }
+  }
+
+  /**
+   * A service server type.
+   */
+  class ServiceServerType extends NamedType {
+    ServiceServerType() {
+      exists(ServiceInterfaceType i, TypeEntity te |
+        this.implements(i) and
+        this.getName().regexpMatch("(?i).*Handler") and
+        te.getType() = this and
+        te.getDeclaration().getLocation().getFile() instanceof ProtocGeneratedFile
+      )
+    }
+  }
+
+  /**
+   * A service register handler.
+   */
+  class ServiceRegisterHandler extends Function {
+    ServiceRegisterHandler() {
+      exists(ServiceServerType c, GoMicroServerType s |
+        this.getName().regexpMatch("(?i)register" + c.getName()) and
+        this.getParameterType(0) = s and
+        this.getDeclaration().getLocation().getFile() instanceof ProtocGeneratedFile
+      )
+    }
+  }
+
+  /**
+   * A service handler.
+   */
+  class ServiceHandler extends Method {
+    ServiceHandler() {
+      exists(DataFlow::CallNode call, Type handlerType, ServiceInterfaceType i |
+        call.getTarget() instanceof ServiceRegisterHandler and
+        call.getArgument(1).getType() = handlerType and
+        this = handlerType.getMethod(_) and
+        this.implements(i.getNamedType().getMethod(_))
+      )
+    }
+  }
+
+  /**
+   * Remote / Untrusted requests coming to the service handler.
+   */
+  class Request extends UntrustedFlowSource::Range instanceof DataFlow::ParameterNode {
+    Request() {
+      exists(FuncDef c, ServiceHandler handler | handler.getFuncDecl() = c |
+        this.asParameter().isParameterOf(c, 1) and
+        handler.getParameterType(0).hasQualifiedName("context", "Context") and
+        this.getType().(PointerType).getBaseType() instanceof ProtocMessageType
+      )
+    }
+  }
+}