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package vault
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"time"
)
const SessionLocalFile = ".envault.session" // kept for .gitignore compat, no longer used
// sessionFile is stored at ~/.envault/sessions/<project>.json
type sessionFile struct {
Project string `json:"project"`
Expires time.Time `json:"expires"`
Nonce []byte `json:"nonce"`
Ciphertext []byte `json:"ciphertext"` // AES-GCM encrypted JSON vars
}
var (
putSessionSecret = storeSessionSecret
getSessionSecret = loadSessionSecret
deleteSessionSecret = removeSessionSecret
)
// safeProjectID returns a collision-resistant, filename-safe identifier for
// the given project name. Using a SHA-256 hash prevents path traversal
// collisions (e.g. "foo" and "../foo" must not share the same session file).
func safeProjectID(project string) string {
h := sha256.Sum256([]byte(project))
return hex.EncodeToString(h[:])
}
func sessionPath(project string) (string, error) {
home, err := os.UserHomeDir()
if err != nil {
return "", err
}
dir := filepath.Join(home, ".envault", "sessions")
if err := os.MkdirAll(dir, 0700); err != nil {
return "", err
}
return filepath.Join(dir, safeProjectID(project)+".json"), nil
}
// CreateSession encrypts the project vars and stores them in ~/.envault/sessions/<project>.json.
// No files are written to the project directory — the session is found by project name alone.
func CreateSession(project string, vars map[string]string, ttl time.Duration) (time.Time, error) {
key := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, key); err != nil {
return time.Time{}, fmt.Errorf("generating session key: %w", err)
}
block, err := aes.NewCipher(key)
if err != nil {
return time.Time{}, err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return time.Time{}, err
}
nonce := make([]byte, gcm.NonceSize())
if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
return time.Time{}, err
}
varsJSON, err := json.Marshal(vars)
if err != nil {
return time.Time{}, err
}
expires := time.Now().Add(ttl).UTC().Truncate(time.Second)
sf := sessionFile{
Project: project,
Expires: expires,
Nonce: nonce,
Ciphertext: gcm.Seal(nil, nonce, varsJSON, nil),
}
data, err := json.Marshal(sf)
if err != nil {
return time.Time{}, err
}
path, err := sessionPath(project)
if err != nil {
return time.Time{}, err
}
if err := os.WriteFile(path, data, 0600); err != nil {
return time.Time{}, fmt.Errorf("writing session: %w", err)
}
if err := putSessionSecret(project, key); err != nil {
_ = os.Remove(path)
return time.Time{}, fmt.Errorf("storing session secret: %w", err)
}
return expires, nil
}
// LoadSession reads the session for the given project and returns decrypted vars.
// Returns nil, nil if no valid session exists — caller should fall back to password.
func LoadSession(project string) (map[string]string, error) {
path, err := sessionPath(project)
if err != nil {
return nil, nil
}
data, err := os.ReadFile(path)
if err != nil {
return nil, nil // no session
}
var sf sessionFile
if err := json.Unmarshal(data, &sf); err != nil {
return nil, nil
}
if time.Now().After(sf.Expires) {
os.Remove(path)
deleteSessionSecret(project)
return nil, nil
}
key, err := getSessionSecret(project)
if err != nil {
return nil, nil
}
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
varsJSON, err := gcm.Open(nil, sf.Nonce, sf.Ciphertext, nil)
if err != nil {
return nil, nil
}
var vars map[string]string
if err := json.Unmarshal(varsJSON, &vars); err != nil {
return nil, err
}
return vars, nil
}
// RefreshSession updates the vars in an existing session while keeping the original expiry.
// If no active session exists, it does nothing.
func RefreshSession(project string, vars map[string]string) error {
expires, ok := SessionInfo(project)
if !ok {
return nil // no active session — nothing to refresh
}
ttl := time.Until(expires)
if ttl <= 0 {
return nil
}
_, err := CreateSession(project, vars, ttl)
return err
}
// DeleteSession removes the session for the given project.
func DeleteSession(project string) {
if path, err := sessionPath(project); err == nil {
os.Remove(path)
}
deleteSessionSecret(project)
}
// SessionInfo returns metadata about the current session without decrypting vars.
func SessionInfo(project string) (expires time.Time, ok bool) {
path, err := sessionPath(project)
if err != nil {
return time.Time{}, false
}
data, err := os.ReadFile(path)
if err != nil {
return time.Time{}, false
}
var sf sessionFile
if err := json.Unmarshal(data, &sf); err != nil {
return time.Time{}, false
}
if time.Now().After(sf.Expires) {
os.Remove(path)
deleteSessionSecret(project)
return time.Time{}, false
}
return sf.Expires, true
}
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