mirror of https://github.com/status-im/consul.git
606 lines
18 KiB
Go
606 lines
18 KiB
Go
package envoy
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import (
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"errors"
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"flag"
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"os/exec"
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"strconv"
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"strings"
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"github.com/mitchellh/cli"
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"github.com/mitchellh/mapstructure"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/consul/agent/xds"
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"github.com/hashicorp/consul/api"
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proxyCmd "github.com/hashicorp/consul/command/connect/proxy"
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"github.com/hashicorp/consul/command/flags"
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"github.com/hashicorp/consul/ipaddr"
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)
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func New(ui cli.Ui) *cmd {
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ui = &cli.PrefixedUi{
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OutputPrefix: "==> ",
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InfoPrefix: " ",
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ErrorPrefix: "==> ",
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Ui: ui,
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}
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c := &cmd{UI: ui}
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c.init()
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return c
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}
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const DefaultAdminAccessLogPath = "/dev/null"
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type cmd struct {
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UI cli.Ui
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flags *flag.FlagSet
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http *flags.HTTPFlags
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help string
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client *api.Client
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// flags
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meshGateway bool
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gateway string
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proxyID string
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sidecarFor string
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adminAccessLogPath string
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adminBind string
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envoyBin string
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bootstrap bool
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disableCentralConfig bool
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grpcAddr string
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envoyVersion string
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// mesh gateway registration information
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register bool
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lanAddress ServiceAddressValue
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wanAddress ServiceAddressValue
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deregAfterCritical string
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bindAddresses ServiceAddressMapValue
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exposeServers bool
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gatewaySvcName string
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gatewayKind api.ServiceKind
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}
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const (
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defaultEnvoyVersion = "1.13.1"
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meshGatewayVal = "mesh"
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)
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var supportedGateways = map[string]api.ServiceKind{
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"mesh": api.ServiceKindMeshGateway,
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"terminating": api.ServiceKindTerminatingGateway,
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}
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func (c *cmd) init() {
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c.flags = flag.NewFlagSet("", flag.ContinueOnError)
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c.flags.StringVar(&c.proxyID, "proxy-id", os.Getenv("CONNECT_PROXY_ID"),
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"The proxy's ID on the local agent.")
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// Deprecated in favor of `gateway`
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c.flags.BoolVar(&c.meshGateway, "mesh-gateway", false,
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"Configure Envoy as a Mesh Gateway.")
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c.flags.StringVar(&c.gateway, "gateway", "",
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"The type of gateway to register. One of: terminating or mesh")
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c.flags.StringVar(&c.sidecarFor, "sidecar-for", os.Getenv("CONNECT_SIDECAR_FOR"),
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"The ID of a service instance on the local agent that this proxy should "+
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"become a sidecar for. It requires that the proxy service is registered "+
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"with the agent as a connect-proxy with Proxy.DestinationServiceID set "+
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"to this value. If more than one such proxy is registered it will fail.")
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c.flags.StringVar(&c.envoyBin, "envoy-binary", "",
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"The full path to the envoy binary to run. By default will just search "+
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"$PATH. Ignored if -bootstrap is used.")
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c.flags.StringVar(&c.adminAccessLogPath, "admin-access-log-path", DefaultAdminAccessLogPath,
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fmt.Sprintf("The path to write the access log for the administration server. If no access "+
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"log is desired specify %q. By default it will use %q.",
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DefaultAdminAccessLogPath, DefaultAdminAccessLogPath))
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c.flags.StringVar(&c.adminBind, "admin-bind", "localhost:19000",
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"The address:port to start envoy's admin server on. Envoy requires this "+
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"but care must be taken to ensure it's not exposed to an untrusted network "+
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"as it has full control over the secrets and config of the proxy.")
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c.flags.BoolVar(&c.bootstrap, "bootstrap", false,
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"Generate the bootstrap.json but don't exec envoy")
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c.flags.BoolVar(&c.disableCentralConfig, "no-central-config", false,
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"By default the proxy's bootstrap configuration can be customized "+
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"centrally. This requires that the command run on the same agent as the "+
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"proxy will and that the agent is reachable when the command is run. In "+
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"cases where either assumption is violated this flag will prevent the "+
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"command attempting to resolve config from the local agent.")
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c.flags.StringVar(&c.grpcAddr, "grpc-addr", os.Getenv(api.GRPCAddrEnvName),
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"Set the agent's gRPC address and port (in http(s)://host:port format). "+
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"Alternatively, you can specify CONSUL_GRPC_ADDR in ENV.")
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c.flags.StringVar(&c.envoyVersion, "envoy-version", defaultEnvoyVersion,
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"Sets the envoy-version that the envoy binary has.")
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c.flags.BoolVar(&c.register, "register", false,
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"Register a new gateway service before configuring and starting Envoy")
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c.flags.Var(&c.lanAddress, "address",
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"LAN address to advertise in the gateway service registration")
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c.flags.Var(&c.wanAddress, "wan-address",
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"WAN address to advertise in the gateway service registration")
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c.flags.Var(&c.bindAddresses, "bind-address", "Bind "+
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"address to use instead of the default binding rules given as `<name>=<ip>:<port>` "+
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"pairs. This flag may be specified multiple times to add multiple bind addresses.")
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c.flags.StringVar(&c.gatewaySvcName, "service", "",
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"Service name to use for the registration")
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c.flags.BoolVar(&c.exposeServers, "expose-servers", false,
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"Expose the servers for WAN federation via this mesh gateway")
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c.flags.StringVar(&c.deregAfterCritical, "deregister-after-critical", "6h",
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"The amount of time the gateway services health check can be failing before being deregistered")
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c.http = &flags.HTTPFlags{}
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flags.Merge(c.flags, c.http.ClientFlags())
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flags.Merge(c.flags, c.http.NamespaceFlags())
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c.help = flags.Usage(help, c.flags)
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}
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// canBindInternal is here mainly so we can unit test this with a constant net.Addr list
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func canBindInternal(addr string, ifAddrs []net.Addr) bool {
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if addr == "" {
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return false
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}
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ip := net.ParseIP(addr)
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if ip == nil {
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return false
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}
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ipStr := ip.String()
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for _, addr := range ifAddrs {
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switch v := addr.(type) {
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case *net.IPNet:
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if v.IP.String() == ipStr {
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return true
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}
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default:
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if addr.String() == ipStr {
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return true
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}
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}
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}
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return false
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}
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func canBind(addr api.ServiceAddress) bool {
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ifAddrs, err := net.InterfaceAddrs()
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if err != nil {
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return false
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}
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return canBindInternal(addr.Address, ifAddrs)
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}
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func (c *cmd) Run(args []string) int {
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if err := c.flags.Parse(args); err != nil {
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return 1
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}
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passThroughArgs := c.flags.Args()
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// Setup Consul client
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client, err := c.http.APIClient()
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
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return 1
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}
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c.client = client
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// Fixup for deprecated mesh-gateway flag
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if c.meshGateway && c.gateway != "" {
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c.UI.Error("The mesh-gateway flag is deprecated and cannot be used alongside the gateway flag")
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return 1
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}
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if c.meshGateway {
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c.gateway = meshGatewayVal
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}
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if c.exposeServers {
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if c.gateway != meshGatewayVal {
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c.UI.Error("'-expose-servers' can only be used for mesh gateways")
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return 1
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}
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if !c.register {
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c.UI.Error("'-expose-servers' requires '-register'")
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return 1
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}
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}
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// Gateway kind is set so that it is available even if not auto-registering the gateway
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if c.gateway != "" {
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kind, ok := supportedGateways[c.gateway]
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if !ok {
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c.UI.Error("Gateway must be one of: terminating or mesh")
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return 1
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}
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c.gatewayKind = kind
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}
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if c.register {
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if c.gateway == "" {
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c.UI.Error("Auto-Registration can only be used for gateways")
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return 1
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}
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if c.gatewaySvcName == "" {
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c.gatewaySvcName = string(c.gatewayKind)
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}
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taggedAddrs := make(map[string]api.ServiceAddress)
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lanAddr := c.lanAddress.Value()
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if lanAddr.Address != "" {
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taggedAddrs[structs.TaggedAddressLAN] = lanAddr
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}
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wanAddr := c.wanAddress.Value()
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if wanAddr.Address != "" {
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taggedAddrs[structs.TaggedAddressWAN] = wanAddr
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}
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tcpCheckAddr := lanAddr.Address
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if tcpCheckAddr == "" {
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// fallback to localhost as the gateway has to reside in the same network namespace
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// as the agent
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tcpCheckAddr = "127.0.0.1"
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}
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var proxyConf *api.AgentServiceConnectProxyConfig
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if len(c.bindAddresses.value) > 0 {
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// override all default binding rules and just bind to the user-supplied addresses
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proxyConf = &api.AgentServiceConnectProxyConfig{
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Config: map[string]interface{}{
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"envoy_gateway_no_default_bind": true,
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"envoy_gateway_bind_addresses": c.bindAddresses.value,
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},
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}
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} else if canBind(lanAddr) && canBind(wanAddr) {
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// when both addresses are bindable then we bind to the tagged addresses
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// for creating the envoy listeners
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proxyConf = &api.AgentServiceConnectProxyConfig{
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Config: map[string]interface{}{
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"envoy_gateway_no_default_bind": true,
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"envoy_gateway_bind_tagged_addresses": true,
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},
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}
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} else if !canBind(lanAddr) && lanAddr.Address != "" {
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c.UI.Error(fmt.Sprintf("The LAN address %q will not be bindable. Either set a bindable address or override the bind addresses with -bind-address", lanAddr.Address))
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return 1
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}
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var meta map[string]string
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if c.exposeServers {
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meta = map[string]string{structs.MetaWANFederationKey: "1"}
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}
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svc := api.AgentServiceRegistration{
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Kind: c.gatewayKind,
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Name: c.gatewaySvcName,
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Address: lanAddr.Address,
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Port: lanAddr.Port,
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Meta: meta,
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TaggedAddresses: taggedAddrs,
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Proxy: proxyConf,
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Check: &api.AgentServiceCheck{
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Name: fmt.Sprintf("%s listening", c.gatewayKind),
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TCP: ipaddr.FormatAddressPort(tcpCheckAddr, lanAddr.Port),
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Interval: "10s",
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DeregisterCriticalServiceAfter: c.deregAfterCritical,
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},
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}
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if err := client.Agent().ServiceRegister(&svc); err != nil {
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c.UI.Error(fmt.Sprintf("Error registering service %q: %s", svc.Name, err))
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return 1
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}
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c.UI.Output(fmt.Sprintf("Registered service: %s", svc.Name))
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}
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// See if we need to lookup proxyID
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if c.proxyID == "" && c.sidecarFor != "" {
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proxyID, err := proxyCmd.LookupProxyIDForSidecar(c.client, c.sidecarFor)
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if err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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c.proxyID = proxyID
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} else if c.proxyID == "" && c.gateway != "" {
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gatewaySvc, err := proxyCmd.LookupGatewayProxy(c.client, c.gatewayKind)
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if err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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c.proxyID = gatewaySvc.ID
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c.gatewaySvcName = gatewaySvc.Service
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}
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if c.proxyID == "" {
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c.UI.Error("No proxy ID specified. One of -proxy-id or -sidecar-for/-gateway is " +
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"required")
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return 1
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}
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// See if we need to lookup grpcAddr
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if c.grpcAddr == "" {
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port, err := c.lookupGRPCPort()
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
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}
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if port <= 0 {
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// This is the dev mode default and recommended production setting if
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// enabled.
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port = 8502
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c.UI.Info(fmt.Sprintf("Defaulting to grpc port = %d", port))
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}
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c.grpcAddr = fmt.Sprintf("localhost:%v", port)
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}
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// Generate config
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bootstrapJson, err := c.generateConfig()
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if err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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if c.bootstrap {
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// Just output it and we are done
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os.Stdout.Write(bootstrapJson)
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return 0
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}
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// Find Envoy binary
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binary, err := c.findBinary()
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if err != nil {
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c.UI.Error("Couldn't find envoy binary: " + err.Error())
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return 1
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}
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err = execEnvoy(binary, nil, passThroughArgs, bootstrapJson)
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if err == errUnsupportedOS {
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c.UI.Error("Directly running Envoy is only supported on linux and macOS " +
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"since envoy itself doesn't build on other platforms currently.")
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c.UI.Error("Use the -bootstrap option to generate the JSON to use when running envoy " +
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"on a supported OS or via a container or VM.")
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return 1
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} else if err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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return 0
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}
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var errUnsupportedOS = errors.New("envoy: not implemented on this operating system")
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func (c *cmd) findBinary() (string, error) {
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if c.envoyBin != "" {
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return c.envoyBin, nil
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}
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return exec.LookPath("envoy")
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}
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func (c *cmd) templateArgs() (*BootstrapTplArgs, error) {
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httpCfg := api.DefaultConfig()
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c.http.MergeOntoConfig(httpCfg)
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// Trigger the Client init to do any last-minute updates to the Config.
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if _, err := api.NewClient(httpCfg); err != nil {
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return nil, err
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}
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// Decide on TLS if the scheme is provided and indicates it, if the HTTP env
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// suggests TLS is supported explicitly (CONSUL_HTTP_SSL) or implicitly
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// (CONSUL_HTTP_ADDR) is https://
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useTLS := false
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if strings.HasPrefix(strings.ToLower(c.grpcAddr), "https://") {
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useTLS = true
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} else if useSSLEnv := os.Getenv(api.HTTPSSLEnvName); useSSLEnv != "" {
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if enabled, err := strconv.ParseBool(useSSLEnv); err == nil {
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useTLS = enabled
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}
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} else if strings.HasPrefix(strings.ToLower(httpCfg.Address), "https://") {
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useTLS = true
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}
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// We want to allow grpcAddr set as host:port with no scheme but if the host
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// is an IP this will fail to parse as a URL with "parse 127.0.0.1:8500: first
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// path segment in URL cannot contain colon". On the other hand we also
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// support both http(s)://host:port and unix:///path/to/file.
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var agentAddr, agentPort, agentSock string
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if grpcAddr := strings.TrimPrefix(c.grpcAddr, "unix://"); grpcAddr != c.grpcAddr {
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// Path to unix socket
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agentSock = grpcAddr
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} else {
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// Parse as host:port with option http prefix
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grpcAddr = strings.TrimPrefix(c.grpcAddr, "http://")
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grpcAddr = strings.TrimPrefix(c.grpcAddr, "https://")
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var err error
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agentAddr, agentPort, err = net.SplitHostPort(grpcAddr)
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if err != nil {
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return nil, fmt.Errorf("Invalid Consul HTTP address: %s", err)
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}
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if agentAddr == "" {
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agentAddr = "127.0.0.1"
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}
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// We use STATIC for agent which means we need to resolve DNS names like
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// `localhost` ourselves. We could use STRICT_DNS or LOGICAL_DNS with envoy
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// but Envoy resolves `localhost` differently to go on macOS at least which
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// causes paper cuts like default dev agent (which binds specifically to
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// 127.0.0.1) isn't reachable since Envoy resolves localhost to `[::]` and
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// can't connect.
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agentIP, err := net.ResolveIPAddr("ip", agentAddr)
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if err != nil {
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return nil, fmt.Errorf("Failed to resolve agent address: %s", err)
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}
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agentAddr = agentIP.String()
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}
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adminAddr, adminPort, err := net.SplitHostPort(c.adminBind)
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if err != nil {
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return nil, fmt.Errorf("Invalid Consul HTTP address: %s", err)
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}
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// Envoy requires IP addresses to bind too when using static so resolve DNS or
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// localhost here.
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adminBindIP, err := net.ResolveIPAddr("ip", adminAddr)
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if err != nil {
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return nil, fmt.Errorf("Failed to resolve admin bind address: %s", err)
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}
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// Ideally the cluster should be the service name. We may or may not have that
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// yet depending on the arguments used so make a best effort here. In the
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// common case, even if the command was invoked with proxy-id and we don't
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// know service name yet, we will after we resolve the proxy's config in a bit
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// and will update this then.
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cluster := c.proxyID
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if c.sidecarFor != "" {
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cluster = c.sidecarFor
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} else if c.gateway != "" && c.gatewaySvcName != "" {
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cluster = c.gatewaySvcName
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}
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adminAccessLogPath := c.adminAccessLogPath
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if adminAccessLogPath == "" {
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adminAccessLogPath = DefaultAdminAccessLogPath
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}
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var caPEM string
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if httpCfg.TLSConfig.CAFile != "" {
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content, err := ioutil.ReadFile(httpCfg.TLSConfig.CAFile)
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if err != nil {
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return nil, fmt.Errorf("Failed to read CA file: %s", err)
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}
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caPEM = strings.Replace(string(content), "\n", "\\n", -1)
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}
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return &BootstrapTplArgs{
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ProxyCluster: cluster,
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ProxyID: c.proxyID,
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AgentAddress: agentAddr,
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AgentPort: agentPort,
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AgentSocket: agentSock,
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AgentTLS: useTLS,
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AgentCAPEM: caPEM,
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AdminAccessLogPath: adminAccessLogPath,
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AdminBindAddress: adminBindIP.String(),
|
|
AdminBindPort: adminPort,
|
|
Token: httpCfg.Token,
|
|
LocalAgentClusterName: xds.LocalAgentClusterName,
|
|
Namespace: httpCfg.Namespace,
|
|
EnvoyVersion: c.envoyVersion,
|
|
}, nil
|
|
}
|
|
|
|
func (c *cmd) generateConfig() ([]byte, error) {
|
|
args, err := c.templateArgs()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var bsCfg BootstrapConfig
|
|
|
|
if !c.disableCentralConfig {
|
|
// Fetch any customization from the registration
|
|
svc, _, err := c.client.Agent().Service(c.proxyID, nil)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed fetch proxy config from local agent: %s", err)
|
|
}
|
|
|
|
if svc.Proxy == nil {
|
|
return nil, errors.New("service is not a Connect proxy or mesh gateway")
|
|
}
|
|
|
|
// Parse the bootstrap config
|
|
if err := mapstructure.WeakDecode(svc.Proxy.Config, &bsCfg); err != nil {
|
|
return nil, fmt.Errorf("failed parsing Proxy.Config: %s", err)
|
|
}
|
|
|
|
if svc.Proxy.DestinationServiceName != "" {
|
|
// Override cluster now we know the actual service name
|
|
args.ProxyCluster = svc.Proxy.DestinationServiceName
|
|
}
|
|
}
|
|
|
|
return bsCfg.GenerateJSON(args)
|
|
}
|
|
|
|
func (c *cmd) lookupGRPCPort() (int, error) {
|
|
self, err := c.client.Agent().Self()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
cfg, ok := self["DebugConfig"]
|
|
if !ok {
|
|
return 0, fmt.Errorf("unexpected agent response: no debug config")
|
|
}
|
|
port, ok := cfg["GRPCPort"]
|
|
if !ok {
|
|
return 0, fmt.Errorf("agent does not have grpc port enabled")
|
|
}
|
|
portN, ok := port.(float64)
|
|
if !ok {
|
|
return 0, fmt.Errorf("invalid grpc port in agent response")
|
|
}
|
|
|
|
return int(portN), nil
|
|
}
|
|
|
|
func (c *cmd) Synopsis() string {
|
|
return synopsis
|
|
}
|
|
|
|
func (c *cmd) Help() string {
|
|
return c.help
|
|
}
|
|
|
|
const synopsis = "Runs or Configures Envoy as a Connect proxy"
|
|
const help = `
|
|
Usage: consul connect envoy [options]
|
|
|
|
Generates the bootstrap configuration needed to start an Envoy proxy instance
|
|
for use as a Connect sidecar for a particular service instance. By default it
|
|
will generate the config and then exec Envoy directly until it exits normally.
|
|
|
|
It will search $PATH for the envoy binary but this can be overridden with
|
|
-envoy-binary.
|
|
|
|
It can instead only generate the bootstrap.json based on the current ENV and
|
|
arguments using -bootstrap.
|
|
|
|
The proxy requires service:write permissions for the service it represents.
|
|
The token may be passed via the CLI or the CONSUL_HTTP_TOKEN environment
|
|
variable.
|
|
|
|
The example below shows how to start a local proxy as a sidecar to a "web"
|
|
service instance. It assumes that the proxy was already registered with it's
|
|
Config for example via a sidecar_service block.
|
|
|
|
$ consul connect envoy -sidecar-for web
|
|
|
|
`
|