133 lines
3.8 KiB
Go
133 lines
3.8 KiB
Go
package main
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import (
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"context"
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"crypto/hmac"
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"crypto/sha256"
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"encoding/base64"
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"fmt"
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"net/http"
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"os"
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"strings"
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"time"
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"github.com/crowdsecurity/crowdsec/pkg/protobufs"
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"github.com/hashicorp/go-hclog"
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"github.com/hashicorp/go-plugin"
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"gopkg.in/yaml.v3"
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)
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type PluginConfig struct {
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Name string `yaml:"name"`
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CustomerID string `yaml:"customer_id"`
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SharedKey string `yaml:"shared_key"`
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LogType string `yaml:"log_type"`
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LogLevel *string `yaml:"log_level"`
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}
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type SentinelPlugin struct {
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PluginConfigByName map[string]PluginConfig
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}
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var logger hclog.Logger = hclog.New(&hclog.LoggerOptions{
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Name: "sentinel-plugin",
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Level: hclog.LevelFromString("INFO"),
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Output: os.Stderr,
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JSONFormat: true,
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})
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func (s *SentinelPlugin) getAuthorizationHeader(now string, length int, pluginName string) (string, error) {
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xHeaders := "x-ms-date:" + now
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stringToHash := fmt.Sprintf("POST\n%d\napplication/json\n%s\n/api/logs", length, xHeaders)
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decodedKey, _ := base64.StdEncoding.DecodeString(s.PluginConfigByName[pluginName].SharedKey)
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h := hmac.New(sha256.New, decodedKey)
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h.Write([]byte(stringToHash))
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encodedHash := base64.StdEncoding.EncodeToString(h.Sum(nil))
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authorization := "SharedKey " + s.PluginConfigByName[pluginName].CustomerID + ":" + encodedHash
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logger.Trace("authorization header", "header", authorization)
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return authorization, nil
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}
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func (s *SentinelPlugin) Notify(ctx context.Context, notification *protobufs.Notification) (*protobufs.Empty, error) {
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if _, ok := s.PluginConfigByName[notification.Name]; !ok {
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return nil, fmt.Errorf("invalid plugin config name %s", notification.Name)
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}
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cfg := s.PluginConfigByName[notification.Name]
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if cfg.LogLevel != nil && *cfg.LogLevel != "" {
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logger.SetLevel(hclog.LevelFromString(*cfg.LogLevel))
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}
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logger.Info("received notification for sentinel config", "name", notification.Name)
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url := fmt.Sprintf("https://%s.ods.opinsights.azure.com/api/logs?api-version=2016-04-01", s.PluginConfigByName[notification.Name].CustomerID)
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body := strings.NewReader(notification.Text)
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//Cannot use time.RFC1123 as azure wants GMT, not UTC
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now := time.Now().UTC().Format("Mon, 02 Jan 2006 15:04:05 GMT")
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authorization, err := s.getAuthorizationHeader(now, len(notification.Text), notification.Name)
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if err != nil {
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return &protobufs.Empty{}, err
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}
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req, err := http.NewRequest(http.MethodPost, url, body)
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if err != nil {
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logger.Error("failed to create request", "error", err)
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return &protobufs.Empty{}, err
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("Log-Type", s.PluginConfigByName[notification.Name].LogType)
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req.Header.Set("Authorization", authorization)
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req.Header.Set("x-ms-date", now)
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client := &http.Client{}
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resp, err := client.Do(req.WithContext(ctx))
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if err != nil {
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logger.Error("failed to send request", "error", err)
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return &protobufs.Empty{}, err
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}
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defer resp.Body.Close()
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logger.Debug("sent notification to sentinel", "status", resp.Status)
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if resp.StatusCode != http.StatusOK {
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return &protobufs.Empty{}, fmt.Errorf("failed to send notification to sentinel: %s", resp.Status)
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}
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return &protobufs.Empty{}, nil
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}
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func (s *SentinelPlugin) Configure(ctx context.Context, config *protobufs.Config) (*protobufs.Empty, error) {
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d := PluginConfig{}
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err := yaml.Unmarshal(config.Config, &d)
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s.PluginConfigByName[d.Name] = d
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return &protobufs.Empty{}, err
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}
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func main() {
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var handshake = plugin.HandshakeConfig{
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ProtocolVersion: 1,
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MagicCookieKey: "CROWDSEC_PLUGIN_KEY",
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MagicCookieValue: os.Getenv("CROWDSEC_PLUGIN_KEY"),
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}
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sp := &SentinelPlugin{PluginConfigByName: make(map[string]PluginConfig)}
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plugin.Serve(&plugin.ServeConfig{
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HandshakeConfig: handshake,
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Plugins: map[string]plugin.Plugin{
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"sentinel": &protobufs.NotifierPlugin{
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Impl: sp,
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},
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},
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GRPCServer: plugin.DefaultGRPCServer,
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Logger: logger,
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})
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}
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