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gateway.go
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gateway.go
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package logic
import (
"errors"
"time"
"github.com/gravitl/netmaker/database"
"github.com/gravitl/netmaker/logger"
"github.com/gravitl/netmaker/models"
"github.com/gravitl/netmaker/servercfg"
)
// IsInternetGw - checks if node is acting as internet gw
func IsInternetGw(node models.Node) bool {
return node.IsInternetGateway
}
// GetInternetGateways - gets all the nodes that are internet gateways
func GetInternetGateways() ([]models.Node, error) {
nodes, err := GetAllNodes()
if err != nil {
return nil, err
}
igs := make([]models.Node, 0)
for _, node := range nodes {
if node.IsInternetGateway {
igs = append(igs, node)
}
}
return igs, nil
}
// GetAllIngresses - gets all the nodes that are ingresses
func GetAllIngresses() ([]models.Node, error) {
nodes, err := GetAllNodes()
if err != nil {
return nil, err
}
ingresses := make([]models.Node, 0)
for _, node := range nodes {
if node.IsIngressGateway {
ingresses = append(ingresses, node)
}
}
return ingresses, nil
}
// GetAllEgresses - gets all the nodes that are egresses
func GetAllEgresses() ([]models.Node, error) {
nodes, err := GetAllNodes()
if err != nil {
return nil, err
}
egresses := make([]models.Node, 0)
for _, node := range nodes {
if node.IsEgressGateway {
egresses = append(egresses, node)
}
}
return egresses, nil
}
// CreateEgressGateway - creates an egress gateway
func CreateEgressGateway(gateway models.EgressGatewayRequest) (models.Node, error) {
node, err := GetNodeByID(gateway.NodeID)
if err != nil {
return models.Node{}, err
}
host, err := GetHost(node.HostID.String())
if err != nil {
return models.Node{}, err
}
if host.OS != "linux" { // support for other OS to be added
return models.Node{}, errors.New(host.OS + " is unsupported for egress gateways")
}
if host.FirewallInUse == models.FIREWALL_NONE {
return models.Node{}, errors.New("firewall is not supported for egress gateways")
}
for i := len(gateway.Ranges) - 1; i >= 0; i-- {
// check if internet gateway IPv4
if gateway.Ranges[i] == "0.0.0.0/0" || gateway.Ranges[i] == "::/0" {
// remove inet range
gateway.Ranges = append(gateway.Ranges[:i], gateway.Ranges[i+1:]...)
continue
}
normalized, err := NormalizeCIDR(gateway.Ranges[i])
if err != nil {
return models.Node{}, err
}
gateway.Ranges[i] = normalized
}
if gateway.NatEnabled == "" {
gateway.NatEnabled = "yes"
}
err = ValidateEgressGateway(gateway)
if err != nil {
return models.Node{}, err
}
if gateway.Ranges == nil {
gateway.Ranges = make([]string, 0)
}
node.IsEgressGateway = true
node.EgressGatewayRanges = gateway.Ranges
node.EgressGatewayNatEnabled = models.ParseBool(gateway.NatEnabled)
node.EgressGatewayRequest = gateway // store entire request for use when preserving the egress gateway
node.SetLastModified()
if err = UpsertNode(&node); err != nil {
return models.Node{}, err
}
return node, nil
}
// ValidateEgressGateway - validates the egress gateway model
func ValidateEgressGateway(gateway models.EgressGatewayRequest) error {
return nil
}
// DeleteEgressGateway - deletes egress from node
func DeleteEgressGateway(network, nodeid string) (models.Node, error) {
node, err := GetNodeByID(nodeid)
if err != nil {
return models.Node{}, err
}
node.IsEgressGateway = false
node.EgressGatewayRanges = []string{}
node.EgressGatewayRequest = models.EgressGatewayRequest{} // remove preserved request as the egress gateway is gone
node.SetLastModified()
if err = UpsertNode(&node); err != nil {
return models.Node{}, err
}
return node, nil
}
// CreateIngressGateway - creates an ingress gateway
func CreateIngressGateway(netid string, nodeid string, ingress models.IngressRequest) (models.Node, error) {
node, err := GetNodeByID(nodeid)
if err != nil {
return models.Node{}, err
}
if node.IsRelayed {
return models.Node{}, errors.New("ingress cannot be created on a relayed node")
}
host, err := GetHost(node.HostID.String())
if err != nil {
return models.Node{}, err
}
if host.OS != "linux" {
return models.Node{}, errors.New("ingress can only be created on linux based node")
}
if host.FirewallInUse == models.FIREWALL_NONE {
return models.Node{}, errors.New("firewall is not supported for ingress gateways")
}
network, err := GetParentNetwork(netid)
if err != nil {
return models.Node{}, err
}
node.IsIngressGateway = true
if !servercfg.IsPro {
node.IsInternetGateway = ingress.IsInternetGateway
}
node.IngressGatewayRange = network.AddressRange
node.IngressGatewayRange6 = network.AddressRange6
node.IngressDNS = ingress.ExtclientDNS
if servercfg.IsPro {
if _, exists := FailOverExists(node.Network); exists {
ResetFailedOverPeer(&node)
}
}
node.SetLastModified()
if node.Metadata == "" {
node.Metadata = "This host can be used for remote access"
}
err = UpsertNode(&node)
if err != nil {
return models.Node{}, err
}
err = SetNetworkNodesLastModified(netid)
return node, err
}
// GetIngressGwUsers - lists the users having to access to ingressGW
func GetIngressGwUsers(node models.Node) (models.IngressGwUsers, error) {
gwUsers := models.IngressGwUsers{
NodeID: node.ID.String(),
Network: node.Network,
}
users, err := GetUsers()
if err != nil {
return gwUsers, err
}
for _, user := range users {
if !user.IsAdmin && !user.IsSuperAdmin {
gwUsers.Users = append(gwUsers.Users, user)
}
}
return gwUsers, nil
}
// DeleteIngressGateway - deletes an ingress gateway
func DeleteIngressGateway(nodeid string) (models.Node, []models.ExtClient, error) {
removedClients := []models.ExtClient{}
node, err := GetNodeByID(nodeid)
if err != nil {
return models.Node{}, removedClients, err
}
clients, err := GetExtClientsByID(nodeid, node.Network)
if err != nil && !database.IsEmptyRecord(err) {
return models.Node{}, removedClients, err
}
removedClients = clients
// delete ext clients belonging to ingress gateway
if err = DeleteGatewayExtClients(node.ID.String(), node.Network); err != nil {
return models.Node{}, removedClients, err
}
logger.Log(3, "deleting ingress gateway")
node.LastModified = time.Now()
node.IsIngressGateway = false
if !servercfg.IsPro {
node.IsInternetGateway = false
}
node.IngressGatewayRange = ""
node.Metadata = ""
err = UpsertNode(&node)
if err != nil {
return models.Node{}, removedClients, err
}
err = SetNetworkNodesLastModified(node.Network)
return node, removedClients, err
}
// DeleteGatewayExtClients - deletes ext clients based on gateway (mac) of ingress node and network
func DeleteGatewayExtClients(gatewayID string, networkName string) error {
currentExtClients, err := GetNetworkExtClients(networkName)
if database.IsEmptyRecord(err) {
return nil
}
if err != nil {
return err
}
for _, extClient := range currentExtClients {
if extClient.IngressGatewayID == gatewayID {
if err = DeleteExtClient(networkName, extClient.ClientID); err != nil {
logger.Log(1, "failed to remove ext client", extClient.ClientID)
continue
}
}
}
return nil
}
// IsUserAllowedAccessToExtClient - checks if user has permission to access extclient
func IsUserAllowedAccessToExtClient(username string, client models.ExtClient) bool {
if username == MasterUser {
return true
}
user, err := GetUser(username)
if err != nil {
return false
}
if !user.IsAdmin && !user.IsSuperAdmin {
if user.UserName != client.OwnerID {
return false
}
}
return true
}