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server.go
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server.go
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package server
import (
"context"
"encoding/json"
"fmt"
"net"
"net/http"
"regexp"
"strconv"
"go.aporeto.io/trireme-lib/v11/common"
"go.aporeto.io/trireme-lib/v11/monitor/registerer"
"go.uber.org/zap"
)
// EventServer is a new event server
type EventServer struct {
socketPath string
server *http.Server
registerer registerer.Registerer
}
// NewEventServer creates a new event server
func NewEventServer(address string, registerer registerer.Registerer) (*EventServer, error) {
err := cleanupPipe(address)
if err != nil {
return nil, err
}
return &EventServer{
socketPath: address,
registerer: registerer,
}, nil
}
// ServeHTTP is called for every request.
func (e *EventServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
e.create(w, r)
}
// Run runs the server. The server will run in the background. It will
// gracefully die with the provided context.
func (e *EventServer) Run(ctx context.Context) error {
// Create the handler
e.server = &http.Server{
Handler: e,
}
listener, err := e.makePipe()
if err != nil {
return err
}
// Start serving HTTP requests in the background
go e.server.Serve(listener) // nolint
// Listen for context cancellation to close the socket.
go func() {
<-ctx.Done()
listener.Close() // nolint
}()
return nil
}
// create is the main hadler that process and validates the events
// before calling the actual monitor handlers to process the event.
func (e *EventServer) create(w http.ResponseWriter, r *http.Request) {
event := &common.EventInfo{}
defer r.Body.Close() // nolint
if err := json.NewDecoder(r.Body).Decode(event); err != nil {
http.Error(w, "Invalid request", http.StatusBadRequest)
return
}
if err := validateTypes(event); err != nil {
zap.L().Error("Error in validating types", zap.Error(err), zap.Reflect("Event", event))
http.Error(w, fmt.Sprintf("Invalid request fields: %s", err), http.StatusBadRequest)
return
}
if err := validateUser(r, event); err != nil {
http.Error(w, fmt.Sprintf("Invalid user to pid mapping found: %s", err), http.StatusForbidden)
return
}
if err := validateEvent(event); err != nil {
http.Error(w, fmt.Sprintf("Bad request: %s", err), http.StatusBadRequest)
return
}
if err := e.processEvent(r.Context(), event); err != nil {
zap.L().Error("Error in processing event", zap.Error(err), zap.Reflect("Event", event))
http.Error(w, fmt.Sprintf("Cannot handle request: %s", err), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusAccepted)
}
// processEvent processes the event by retrieving the right monitor handler.
func (e *EventServer) processEvent(ctx context.Context, eventInfo *common.EventInfo) (err error) {
if e.registerer == nil {
return fmt.Errorf("No registered handlers")
}
f, err := e.registerer.GetHandler(eventInfo.PUType, eventInfo.EventType)
if err != nil {
return fmt.Errorf("Handler not found: %s", err)
}
return f(ctx, eventInfo)
}
// validateTypes validates the various types and prevents any bad strings.
func validateTypes(event *common.EventInfo) error {
regexStrings := regexp.MustCompile("^[a-zA-Z0-9_:.$%/-]{0,256}$")
regexNS := regexp.MustCompile("^[a-zA-Z0-9/-]{0,128}$")
regexCgroup := regexp.MustCompile("^/trireme/(uid/){0,1}[a-zA-Z0-9_:.$%]{1,64}$")
if _, ok := common.EventMap[event.EventType]; !ok {
return fmt.Errorf("invalid event: %s", string(event.EventType))
}
if event.PUType > common.TransientPU {
return fmt.Errorf("invalid pu type %v", event.PUType)
}
if event.PUType == common.UIDLoginPU {
if !regexStrings.Match([]byte(event.Name)) {
return fmt.Errorf("Name is not of the right format")
}
}
if len(event.Cgroup) > 0 && !regexCgroup.Match([]byte(event.Cgroup)) {
return fmt.Errorf("Invalid cgroup format: %s", event.Cgroup)
}
if !regexNS.Match([]byte(event.NS)) {
return fmt.Errorf("Namespace is not of the right format")
}
for k, v := range event.IPs {
if !regexStrings.Match([]byte(k)) {
return fmt.Errorf("Invalid IP name: %s", k)
}
if ip := net.ParseIP(v); ip == nil {
return fmt.Errorf("Invalid IP address: %s", v)
}
}
return nil
}
// validateEvent validates that this is reasonable event and
// modifies the default values.
func validateEvent(event *common.EventInfo) error {
if event.EventType == common.EventCreate || event.EventType == common.EventStart {
if event.HostService {
if event.NetworkOnlyTraffic {
if event.Name == "" {
return fmt.Errorf("Service name must be provided and must not be default")
}
}
} else {
if event.PUID == "" {
event.PUID = strconv.Itoa(int(event.PID))
}
}
}
if event.EventType == common.EventStop || event.EventType == common.EventDestroy {
regStop := regexp.MustCompile("^/trireme/[a-zA-Z0-9_]{1,11}$")
if event.Cgroup != "" && !regStop.Match([]byte(event.Cgroup)) {
return fmt.Errorf("Cgroup is not of the right format")
}
}
return nil
}