|
| 1 | +package waf |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "text/template" |
| 6 | + |
| 7 | + ngfAPI "github.com/nginx/nginx-gateway-fabric/apis/v1alpha1" |
| 8 | + "github.com/nginx/nginx-gateway-fabric/internal/controller/nginx/config/http" |
| 9 | + "github.com/nginx/nginx-gateway-fabric/internal/controller/nginx/config/policies" |
| 10 | + "github.com/nginx/nginx-gateway-fabric/internal/framework/helpers" |
| 11 | +) |
| 12 | + |
| 13 | +var tmpl = template.Must(template.New("waf policy").Parse(wafTemplate)) |
| 14 | + |
| 15 | +const wafTemplate = ` |
| 16 | +{{- if .BundlePath }} |
| 17 | +app_protect_enable on; |
| 18 | +app_protect_policy_file "{{ .BundlePath }}"; |
| 19 | +{{- end }} |
| 20 | +{{- if .SecurityLogs }} |
| 21 | +app_protect_security_log_enable on; |
| 22 | +{{- range .SecurityLogs }} |
| 23 | +{{- if .LogProfile }} |
| 24 | +app_protect_security_log "{{ .LogProfile }}" {{ .Destination }}; |
| 25 | +{{- else if .LogProfileBundlePath }} |
| 26 | +app_protect_security_log "{{ .LogProfileBundlePath }}" {{ .Destination }}; |
| 27 | +{{- end }} |
| 28 | +{{- end }} |
| 29 | +{{- end }} |
| 30 | +` |
| 31 | + |
| 32 | +// Generator generates nginx configuration based on a WAF policy. |
| 33 | +type Generator struct { |
| 34 | + policies.UnimplementedGenerator |
| 35 | +} |
| 36 | + |
| 37 | +// NewGenerator returns a new instance of Generator. |
| 38 | +func NewGenerator() *Generator { |
| 39 | + return &Generator{} |
| 40 | +} |
| 41 | + |
| 42 | +// GenerateForServer generates policy configuration for the server block. |
| 43 | +func (g Generator) GenerateForServer(pols []policies.Policy, _ http.Server) policies.GenerateResultFiles { |
| 44 | + return generate(pols) |
| 45 | +} |
| 46 | + |
| 47 | +// GenerateForLocation generates policy configuration for a normal location block. |
| 48 | +func (g Generator) GenerateForLocation(pols []policies.Policy, _ http.Location) policies.GenerateResultFiles { |
| 49 | + return generate(pols) |
| 50 | +} |
| 51 | + |
| 52 | +func generate(pols []policies.Policy) policies.GenerateResultFiles { |
| 53 | + files := make(policies.GenerateResultFiles, 0, len(pols)) |
| 54 | + |
| 55 | + for _, pol := range pols { |
| 56 | + wp, ok := pol.(*ngfAPI.WAFPolicy) |
| 57 | + if !ok { |
| 58 | + continue |
| 59 | + } |
| 60 | + |
| 61 | + fields := map[string]any{} |
| 62 | + |
| 63 | + if wp.Spec.PolicySource != nil && wp.Spec.PolicySource.FileLocation != "" { |
| 64 | + fileLocation := wp.Spec.PolicySource.FileLocation |
| 65 | + bundleName := helpers.ToSafeFileName(fileLocation) |
| 66 | + bundlePath := fmt.Sprintf("%s/%s.tgz", "/etc/app_protect/bundles", bundleName) |
| 67 | + fields["BundlePath"] = bundlePath |
| 68 | + } |
| 69 | + |
| 70 | + if len(wp.Spec.SecurityLogs) > 0 { |
| 71 | + securityLogs := make([]map[string]string, 0, len(wp.Spec.SecurityLogs)) |
| 72 | + |
| 73 | + for _, secLog := range wp.Spec.SecurityLogs { |
| 74 | + logEntry := map[string]string{} |
| 75 | + |
| 76 | + if secLog.LogProfile != nil { |
| 77 | + logEntry["LogProfile"] = string(*secLog.LogProfile) |
| 78 | + } |
| 79 | + |
| 80 | + if secLog.LogProfileBundle != nil && secLog.LogProfileBundle.FileLocation != "" { |
| 81 | + bundleName := helpers.ToSafeFileName(secLog.LogProfileBundle.FileLocation) |
| 82 | + bundlePath := fmt.Sprintf("%s/%s.tgz", "/etc/app_protect/bundles", bundleName) |
| 83 | + logEntry["LogProfileBundlePath"] = bundlePath |
| 84 | + } |
| 85 | + |
| 86 | + destination := formatSecurityLogDestination(secLog.Destination) |
| 87 | + logEntry["Destination"] = destination |
| 88 | + |
| 89 | + securityLogs = append(securityLogs, logEntry) |
| 90 | + } |
| 91 | + |
| 92 | + fields["SecurityLogs"] = securityLogs |
| 93 | + } |
| 94 | + |
| 95 | + files = append(files, policies.File{ |
| 96 | + Name: fmt.Sprintf("WafPolicy_%s_%s.conf", wp.Namespace, wp.Name), |
| 97 | + Content: helpers.MustExecuteTemplate(tmpl, fields), |
| 98 | + }) |
| 99 | + } |
| 100 | + |
| 101 | + return files |
| 102 | +} |
| 103 | + |
| 104 | +func formatSecurityLogDestination(dest ngfAPI.SecurityLogDestination) string { |
| 105 | + switch dest.Type { |
| 106 | + case ngfAPI.SecurityLogDestinationTypeStderr: |
| 107 | + return "stderr" |
| 108 | + case ngfAPI.SecurityLogDestinationTypeFile: |
| 109 | + if dest.File != nil { |
| 110 | + return dest.File.Path |
| 111 | + } |
| 112 | + return "stderr" |
| 113 | + case ngfAPI.SecurityLogDestinationTypeSyslog: |
| 114 | + if dest.Syslog != nil { |
| 115 | + return fmt.Sprintf("syslog:server=%s", dest.Syslog.Server) |
| 116 | + } |
| 117 | + return "stderr" |
| 118 | + default: |
| 119 | + return "stderr" |
| 120 | + } |
| 121 | +} |
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