Add on demand path permission

caddytest/integration/caddyfile_adapt/global_options_ondemand_permission_path.caddyfiletest

@@ -0,0 +1,104 @@
+{
+	debug
+	http_port 8080
+	https_port 8443
+	default_sni localhost
+	order root first
+	storage file_system {
+		root /data
+	}
+	acme_ca https://example.com
+	acme_eab {
+		key_id 4K2scIVbBpNd-78scadB2g
+		mac_key abcdefghijklmnopqrstuvwx-abcdefghijklnopqrstuvwxyz12ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefgh
+	}
+	acme_ca_root /path/to/ca.crt
+	email test@example.com
+	admin off
+	on_demand_tls {
+		permission path /tmp/web
+		interval 30s
+		burst 20
+	}
+	storage_clean_interval 7d
+	renew_interval 1d
+	ocsp_interval 2d
+
+	key_type ed25519
+}
+
+:80
+----------
+{
+	"admin": {
+		"disabled": true
+	},
+	"logging": {
+		"logs": {
+			"default": {
+				"level": "DEBUG"
+			}
+		}
+	},
+	"storage": {
+		"module": "file_system",
+		"root": "/data"
+	},
+	"apps": {
+		"http": {
+			"http_port": 8080,
+			"https_port": 8443,
+			"servers": {
+				"srv0": {
+					"listen": [
+						":80"
+					]
+				}
+			}
+		},
+		"tls": {
+			"automation": {
+				"policies": [
+					{
+						"issuers": [
+							{
+								"ca": "https://example.com",
+								"challenges": {
+									"http": {
+										"alternate_port": 8080
+									},
+									"tls-alpn": {
+										"alternate_port": 8443
+									}
+								},
+								"email": "test@example.com",
+								"external_account": {
+									"key_id": "4K2scIVbBpNd-78scadB2g",
+									"mac_key": "abcdefghijklmnopqrstuvwx-abcdefghijklnopqrstuvwxyz12ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefgh"
+								},
+								"module": "acme",
+								"trusted_roots_pem_files": [
+									"/path/to/ca.crt"
+								]
+							}
+						],
+						"key_type": "ed25519"
+					}
+				],
+				"on_demand": {
+					"permission": {
+						"module": "path",
+						"root_path": "/tmp/web"
+					},
+					"rate_limit": {
+						"interval": 30000000000,
+						"burst": 20
+					}
+				},
+				"ocsp_interval": 172800000000000,
+				"renew_interval": 86400000000000,
+				"storage_clean_interval": 604800000000000
+			}
+		}
+	}
+}

modules/caddytls/ondemand_path.go

@@ -0,0 +1,68 @@
+package caddytls
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path"
+
+	"github.com/caddyserver/caddy/v2"
+	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
+	"go.uber.org/zap"
+)
+
+type PermissionByPath struct {
+	RootPath string `json:"root_path"`
+
+	logger   *zap.Logger
+	replacer *caddy.Replacer
+}
+
+func (p PermissionByPath) CertificateAllowed(ctx context.Context, name string) error {
+	askRooPath, err := p.replacer.ReplaceOrErr(p.RootPath, true, true)
+	if err != nil {
+		return fmt.Errorf("preparing 'ask' path: %v", err)
+	}
+
+	filePath := path.Join(askRooPath, name)
+	if _, err := os.Stat(filePath); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
+func (p *PermissionByPath) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
+	if !d.Next() {
+		return nil
+	}
+	if !d.AllArgs(&p.RootPath) {
+		return d.ArgErr()
+	}
+	return nil
+}
+
+func (p *PermissionByPath) Provision(ctx caddy.Context) error {
+	p.logger = ctx.Logger()
+	p.replacer = caddy.NewReplacer()
+	return nil
+}
+
+func init() {
+	caddy.RegisterModule(PermissionByPath{})
+}
+
+// CaddyModule returns the Caddy module information.
+func (PermissionByPath) CaddyModule() caddy.ModuleInfo {
+	return caddy.ModuleInfo{
+		ID:  "tls.permission.path",
+		New: func() caddy.Module { return new(PermissionByPath) },
+	}
+}
+
+// Interface guards
+var (
+	_ OnDemandPermission = (*PermissionByPath)(nil)
+	_ caddy.Provisioner  = (*PermissionByPath)(nil)
+)