119 lines
3.6 KiB
Go
119 lines
3.6 KiB
Go
package main
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"net/url"
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"os"
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"path/filepath"
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"strings"
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)
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type startupConfig struct {
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Listen string `json:"listen"`
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DispatcherID string `json:"dispatcher_id"`
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DispatcherSecret string `json:"dispatcher_secret"`
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BrokerURL string `json:"broker_url"`
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Snapshots string `json:"snapshots"`
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Feedback string `json:"feedback_dir"`
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TLSCert string `json:"tls_cert,omitempty"`
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TLSKey string `json:"tls_key,omitempty"`
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}
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func loadStartup(path string) (startupConfig, error) {
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var c startupConfig
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info, err := os.Stat(path)
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if err != nil {
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return c, fmt.Errorf("read startup config: %w", err)
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}
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if !info.Mode().IsRegular() || info.Mode().Perm()&0077 != 0 {
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return c, errors.New("startup config must be a private regular file")
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}
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raw, err := os.ReadFile(path)
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if err != nil {
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return c, fmt.Errorf("read startup config: %w", err)
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}
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dec := json.NewDecoder(bytes.NewReader(raw))
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dec.DisallowUnknownFields()
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if err = dec.Decode(&c); err != nil || !json.Valid(raw) {
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return c, errors.New("invalid startup configuration")
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}
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if c.Listen == "" {
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c.Listen = "0.0.0.0:8089"
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}
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if _, _, err = net.SplitHostPort(c.Listen); err != nil {
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return c, errors.New("listen must specify host and port")
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}
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if c.DispatcherID == "" || c.DispatcherSecret == "" || strings.ContainsAny(c.DispatcherID+c.DispatcherSecret, "\r\n") || c.Snapshots == "" || c.Feedback == "" {
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return c, errors.New("dispatcher identity, secret, snapshots and feedback_dir are required")
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}
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address, err := url.Parse(c.BrokerURL)
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if err != nil || (address.Scheme != "amqp" && address.Scheme != "amqps") || address.Host == "" || !strings.HasPrefix(strings.TrimPrefix(address.Path, "/"), "saas-mock-") {
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return c, errors.New("broker_url must use a dedicated saas-mock-* vhost")
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}
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base, err := filepath.Abs(filepath.Dir(path))
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if err != nil {
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return c, err
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}
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resolve := func(p string) string {
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if p == "" {
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return ""
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}
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if !filepath.IsAbs(p) {
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p = filepath.Join(base, p)
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}
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return filepath.Clean(p)
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}
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c.Snapshots = resolve(c.Snapshots)
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c.Feedback = resolve(c.Feedback)
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c.TLSCert = resolve(c.TLSCert)
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c.TLSKey = resolve(c.TLSKey)
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// Resolve existing path components so aliases cannot place output in an input directory.
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realPath := func(p string) (string, error) {
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var suffix []string
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for {
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real, e := filepath.EvalSymlinks(p)
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if e == nil {
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for i := len(suffix) - 1; i >= 0; i-- {
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real = filepath.Join(real, suffix[i])
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}
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return real, nil
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}
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if !os.IsNotExist(e) {
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return "", e
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}
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parent := filepath.Dir(p)
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if parent == p {
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return "", e
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}
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suffix = append(suffix, filepath.Base(p))
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p = parent
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}
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}
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c.Snapshots, err = realPath(c.Snapshots)
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if err != nil {
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return c, fmt.Errorf("snapshot path: %w", err)
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}
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c.Feedback, err = realPath(c.Feedback)
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if err != nil {
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return c, fmt.Errorf("feedback path: %w", err)
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}
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overlaps := func(a, b string) bool {
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rel, e := filepath.Rel(a, b)
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return e == nil && (rel == "." || !strings.HasPrefix(rel, ".."+string(filepath.Separator)) && rel != "..")
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}
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if overlaps(c.Snapshots, c.Feedback) || overlaps(c.Feedback, c.Snapshots) || overlaps(c.Feedback, resolve(filepath.Base(path))) {
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return c, errors.New("feedback directory must be separate from configuration inputs")
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}
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if (c.TLSCert == "") != (c.TLSKey == "") {
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return c, errors.New("tls_cert and tls_key must be provided together")
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}
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if c.TLSCert != "" && (overlaps(c.Feedback, c.TLSCert) || overlaps(c.Feedback, c.TLSKey)) {
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return c, errors.New("feedback directory overlaps TLS inputs")
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}
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return c, nil
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}
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