pure-Go smcli: Bitwarden/Vaultwarden client replacing upstream Rust bw

Full client-side crypto (PBKDF2/Argon2id master key, HKDF stretch,
AES-256-CBC+HMAC encstrings), password grant with TOTP 2FA, sync,
list/get/env/set/rm. Containerized (alpine, non-root), CI = gofmt/vet/
build/secret-scan, compose service ukrrs-secretsmgr-cli. Rust-era
scripts archived. Live-validated against pwvault.turnsys.com.

Ticket: https://projects.knownelement.com/issues/832

cli/cmd/smcli/api.go

@@ -0,0 +1,291 @@
+package main
+
+// Vaultwarden/Bitwarden API client: prelogin, login, sync, cipher create/edit.
+
+import (
+	"bytes"
+	"encoding/binary"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+	"time"
+)
+
+type Client struct {
+	Server   string // e.g. https://pwvault.turnsys.com
+	HTTP     *http.Client
+	Email    string
+	Password string
+
+	AccessToken  string
+	KDFType      int
+	KDFIter      uint32
+	KDFMemory    uint32
+	KDFParallel  uint32
+	MasterKey    []byte // 32B
+	StretchedKey []byte // 64B
+	UserSymKey   []byte // 64B (decrypted from profile.Key)
+}
+
+func (c *Client) api(method, path string, body any, auth bool) ([]byte, error) {
+	var rd io.Reader
+	if body != nil {
+		switch b := body.(type) {
+		case url.Values:
+			rd = strings.NewReader(b.Encode())
+		default:
+			j, err := json.Marshal(body)
+			if err != nil {
+				return nil, err
+			}
+			rd = bytes.NewReader(j)
+		}
+	} else {
+		rd = strings.NewReader("")
+	}
+	req, err := http.NewRequest(method, c.Server+path, rd)
+	if err != nil {
+		return nil, err
+	}
+	if body != nil {
+		if _, ok := body.(url.Values); ok {
+			req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+		} else {
+			req.Header.Set("Content-Type", "application/json")
+		}
+	}
+	if auth {
+		req.Header.Set("Authorization", "Bearer "+c.AccessToken)
+	}
+	resp, err := c.HTTP.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	out, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode >= 300 {
+		return out, fmt.Errorf("%s %s: HTTP %d: %s", method, path, resp.StatusCode, truncate(string(out), 200))
+	}
+	return out, nil
+}
+
+func truncate(s string, n int) string {
+	if len(s) <= n {
+		return s
+	}
+	return s[:n] + "..."
+}
+
+type preloginResp struct {
+	KDF             int    `json:"kdf"`
+	KDFIterations   uint32 `json:"kdfIterations"`
+	KDFMemory       uint32 `json:"kdfMemory"`
+	KDFParallelism  uint32 `json:"kdfParallelism"`
+}
+
+func (c *Client) Prelogin() error {
+	out, err := c.api("POST", "/api/accounts/prelogin", map[string]string{"email": c.Email}, false)
+	if err != nil {
+		return err
+	}
+	var p preloginResp
+	if err := json.Unmarshal(out, &p); err != nil {
+		return err
+	}
+	c.KDFType, c.KDFIter, c.KDFMemory, c.KDFParallel = p.KDF, p.KDFIterations, p.KDFMemory, p.KDFParallelism
+	return nil
+}
+
+type tokenResp struct {
+	AccessToken string `json:"access_token"`
+	RefreshTok  string `json:"refresh_token"`
+	Key         string `json:"Key"`
+	PrivateKey  string `json:"PrivateKey"`
+	ErrorDesc   string `json:"ErrorDescription"`
+}
+
+// Login performs prelogin + key derivation + password grant.
+func (c *Client) Login() error {
+	if err := c.Prelogin(); err != nil {
+		return fmt.Errorf("prelogin: %w", err)
+	}
+	c.MasterKey = deriveMasterKey(c.Password, c.Email, c.KDFType, c.KDFIter, c.KDFMemory, c.KDFParallel)
+	c.StretchedKey = stretchKey(c.MasterKey)
+
+	form := url.Values{}
+	form.Set("grant_type", "password")
+	form.Set("username", c.Email)
+	form.Set("password", masterPasswordHash(c.MasterKey, c.Password))
+	form.Set("scope", "api offline_access")
+	form.Set("client_id", "cli")
+	form.Set("deviceIdentifier", deviceID())
+	form.Set("deviceName", "smcli")
+	form.Set("deviceType", "9")
+	var lastOut []byte
+	out, err := c.apiRaw("POST", "/identity/connect/token", form, false)
+	if err != nil {
+		return fmt.Errorf("token: %w", err)
+	}
+	var t tokenResp
+	if err := json.Unmarshal(out, &t); err != nil {
+		return err
+	}
+	if t.AccessToken == "" {
+		// 2FA retry path (provider 0 = authenticator TOTP)
+		if strings.Contains(string(out), "Two factor required") {
+			secret := os.Getenv("SM_TOTP_SECRET")
+			if secret != "" {
+				code, terr := totpNow(secret, time.Now())
+				if terr != nil {
+					return fmt.Errorf("totp: %w", terr)
+				}
+				form.Set("twoFactor", "0")
+				form.Set("twoFactorProvider", "0")
+				form.Set("twoFactorToken", code)
+				form.Set("twoFactorRemember", "1")
+				out2, err2 := c.api("POST", "/identity/connect/token", form, false)
+				if err2 != nil {
+					return fmt.Errorf("token(2fa): %w", err2)
+				}
+				if err := json.Unmarshal(out2, &t); err != nil {
+					return err
+				}
+				lastOut = out2
+			}
+		}
+	}
+	if t.AccessToken == "" {
+		payload := string(out)
+		if lastOut != nil {
+			payload = string(lastOut)
+		}
+		return fmt.Errorf("login failed: %s", truncate(payload, 300))
+	}
+	c.AccessToken = t.AccessToken
+	return nil
+}
+
+type syncResp struct {
+	Profile struct {
+		Key        string `json:"key"`
+		PrivateKey string `json:"privateKey"`
+		Email      string `json:"email"`
+	} `json:"profile"`
+	Folders []struct {
+		ID   string `json:"id"`
+		Name string `json:"name"`
+	} `json:"folders"`
+	Ciphers []json.RawMessage `json:"ciphers"`
+}
+
+// Unlock performs sync-light: fetches profile key, decrypts the user sym key.
+func (c *Client) Unlock() error {
+	out, err := c.api("GET", "/api/sync?excludeDomains=true", nil, true)
+	if err != nil {
+		return err
+	}
+	var s syncResp
+	if err := json.Unmarshal(out, &s); err != nil {
+		return err
+	}
+	if s.Profile.Key == "" {
+		return errors.New("sync: empty profile key")
+	}
+	es, err := ParseEncString(s.Profile.Key)
+	if err != nil {
+		return err
+	}
+	c.UserSymKey, err = symDecrypt(c.StretchedKey, es)
+	if err != nil {
+		return fmt.Errorf("decrypt user key: %w", err)
+	}
+	return nil
+}
+
+// Sync returns the raw sync payload (cached by caller as needed).
+func (c *Client) Sync() ([]byte, error) {
+	return c.api("GET", "/api/sync?excludeDomains=true", nil, true)
+}
+
+// CreateCipher posts an encrypted cipher.
+func (c *Client) CreateCipher(cipherJSON any) ([]byte, error) {
+	return c.api("POST", "/api/ciphers", cipherJSON, true)
+}
+
+// EditCipher updates an encrypted cipher.
+func (c *Client) EditCipher(id string, cipherJSON any) ([]byte, error) {
+	return c.api("PUT", "/api/ciphers/"+id, cipherJSON, true)
+}
+
+
+
+func deviceID() string {
+	// stable per machine: hash of hostname (no secrets involved)
+	hn := hostnameSafe()
+	sum := sha256Sum([]byte("knel-secretsmgr:" + hn))
+	var b [16]byte
+	copy(b[:], sum[:16])
+	return fmt.Sprintf("%08x-%04x-%04x-%04x-%012x",
+		binary.BigEndian.Uint32(b[0:4]),
+		binary.BigEndian.Uint16(b[4:6]),
+		binary.BigEndian.Uint16(b[6:8]),
+		binary.BigEndian.Uint16(b[8:10]),
+		b[10:16])
+}
+
+// apiRaw performs the request and returns the body regardless of status.
+func (c *Client) apiRaw(method, path string, body any, auth bool) ([]byte, error) {
+	var rd io.Reader
+	if body != nil {
+		switch b := body.(type) {
+		case url.Values:
+			rd = strings.NewReader(b.Encode())
+		default:
+			j, err := json.Marshal(body)
+			if err != nil {
+				return nil, err
+			}
+			rd = bytes.NewReader(j)
+		}
+	} else {
+		rd = strings.NewReader("")
+	}
+	req, err := http.NewRequest(method, c.Server+path, rd)
+	if err != nil {
+		return nil, err
+	}
+	if body != nil {
+		if _, ok := body.(url.Values); ok {
+			req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+		} else {
+			req.Header.Set("Content-Type", "application/json")
+		}
+	}
+	if auth {
+		req.Header.Set("Authorization", "Bearer "+c.AccessToken)
+	}
+	resp, err := c.HTTP.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	return io.ReadAll(resp.Body)
+}
+
+// DeleteCipher moves a cipher to trash (soft delete). Best-effort permanent
+// purge afterwards; Vaultwarden tolerates trash-only items.
+func (c *Client) DeleteCipher(id string) error {
+	if _, err := c.api("DELETE", "/api/ciphers/"+id, nil, true); err != nil {
+		return err
+	}
+	_, _ = c.api("PUT", "/api/ciphers/"+id+"/purge", map[string]any{}, true)
+	return nil
+}

cli/cmd/smcli/crypto.go

@@ -0,0 +1,204 @@
+package main
+
+// Bitwarden-compatible crypto for the KNELSecretsManager CLI (Vaultwarden API).
+//   - master key: PBKDF2-SHA256(password, email, iterations, 32B) or Argon2id
+//   - auth: masterPasswordHash = base64(PBKDF2-SHA256(masterKey, password, 1, 32B))
+//   - stretched master key: HKDF-SHA256 expand, info "enc"/"mac" (32B each)
+//   - encString "2.iv|ct|mac": AES-256-CBC(encKey32) + HMAC-SHA256(macKey32, iv||ct)
+//     ("AesCbc128_HmacSha256_B64" is Bitwarden's legacy misnomer; keys are 32+32 bytes)
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/hmac"
+	"crypto/rand"
+	"crypto/sha256"
+	"crypto/subtle"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"golang.org/x/crypto/argon2"
+	"golang.org/x/crypto/pbkdf2"
+)
+
+type EncString struct {
+	Type byte
+	IV   []byte
+	CT   []byte
+	MAC  []byte
+}
+
+func ParseEncString(s string) (*EncString, error) {
+	if s == "" {
+		return nil, errors.New("empty encstring")
+	}
+	parts := strings.SplitN(s, ".", 2)
+	if len(parts) != 2 {
+		return nil, errors.New("encstring missing type header")
+	}
+	t, err := strconv.Atoi(parts[0])
+	if err != nil {
+		return nil, fmt.Errorf("bad encstring type: %w", err)
+	}
+	es := &EncString{Type: byte(t)}
+	switch t {
+	case 0: // AesCbc256_B64 (legacy, no mac)
+		b, err := base64.StdEncoding.DecodeString(parts[1])
+		if err != nil {
+			return nil, err
+		}
+		es.IV, es.CT = b[:16], b[16:]
+	case 1, 2: // both handled identically on the wire (enc32+mac32 keys)
+		seg := strings.Split(parts[1], "|")
+		if len(seg) != 3 {
+			return nil, errors.New("encstring needs iv|ct|mac")
+		}
+		if es.IV, err = base64.StdEncoding.DecodeString(seg[0]); err != nil {
+			return nil, err
+		}
+		if es.CT, err = base64.StdEncoding.DecodeString(seg[1]); err != nil {
+			return nil, err
+		}
+		if es.MAC, err = base64.StdEncoding.DecodeString(seg[2]); err != nil {
+			return nil, err
+		}
+	default:
+		return nil, fmt.Errorf("unsupported encstring type %d", t)
+	}
+	return es, nil
+}
+
+func (e *EncString) String() string {
+	if e.Type == 0 {
+		return "0." + base64.StdEncoding.EncodeToString(append(append([]byte{}, e.IV...), e.CT...))
+	}
+	return fmt.Sprintf("%d.%s|%s|%s", e.Type,
+		base64.StdEncoding.EncodeToString(e.IV),
+		base64.StdEncoding.EncodeToString(e.CT),
+		base64.StdEncoding.EncodeToString(e.MAC))
+}
+
+func deriveMasterKey(password, email string, kdfType int, iterations, memory, parallelism uint32) []byte {
+	salt := []byte(strings.ToLower(strings.TrimSpace(email)))
+	switch kdfType {
+	case 1:
+		return argon2.IDKey([]byte(password), salt, iterations, memory, uint8(parallelism), 32)
+	default:
+		return pbkdf2.Key([]byte(password), salt, int(iterations), 32, sha256.New)
+	}
+}
+
+func masterPasswordHash(masterKey []byte, password string) string {
+	return base64.StdEncoding.EncodeToString(pbkdf2.Key(masterKey, []byte(password), 1, 32, sha256.New))
+}
+
+// stretchKey expands the 32B master key to a 64B symmetric key (enc 32 | mac 32).
+func stretchKey(masterKey []byte) []byte {
+	out := make([]byte, 64)
+	copy(out[:32], hkdfExpand(masterKey, []byte("enc"), 32))
+	copy(out[32:], hkdfExpand(masterKey, []byte("mac"), 32))
+	return out
+}
+
+func hkdfExpand(key, info []byte, length int) []byte {
+	out := make([]byte, 0, length)
+	t := []byte{}
+	var i byte
+	for len(out) < length {
+		i++
+		h := hmac.New(sha256.New, key)
+		h.Write(t)
+		h.Write(info)
+		h.Write([]byte{i})
+		t = h.Sum(nil)
+		out = append(out, t...)
+	}
+	return out[:length]
+}
+
+// symDecrypt decrypts a type-1/2 encstring with a 64-byte key (enc32|mac32).
+func symDecrypt(key64 []byte, es *EncString) ([]byte, error) {
+	if len(key64) != 64 {
+		return nil, errors.New("symmetric key must be 64 bytes")
+	}
+	if es.Type == 0 {
+		return aesCBCDecrypt(key64[:32], es.IV, es.CT)
+	}
+	if es.Type != 1 && es.Type != 2 {
+		return nil, fmt.Errorf("unsupported encstring type %d", es.Type)
+	}
+	mac := hmac.New(sha256.New, key64[32:])
+	mac.Write(es.IV)
+	mac.Write(es.CT)
+	if subtle.ConstantTimeCompare(mac.Sum(nil), es.MAC) != 1 {
+		return nil, errors.New("mac mismatch")
+	}
+	return aesCBCDecrypt(key64[:32], es.IV, es.CT)
+}
+
+// symEncrypt encrypts plaintext into a type-2 encstring with a 64-byte key.
+func symEncrypt(key64 []byte, plaintext []byte) (string, error) {
+	if len(key64) != 64 {
+		return "", errors.New("symmetric key must be 64 bytes")
+	}
+	iv := make([]byte, 16)
+	if _, err := rand.Read(iv); err != nil {
+		return "", err
+	}
+	ct, err := aesCBCEncrypt(key64[:32], iv, plaintext)
+	if err != nil {
+		return "", err
+	}
+	mac := hmac.New(sha256.New, key64[32:])
+	mac.Write(iv)
+	mac.Write(ct)
+	es := &EncString{Type: 2, IV: iv, CT: ct, MAC: mac.Sum(nil)}
+	return es.String(), nil
+}
+
+func aesCBCDecrypt(key, iv, ct []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	if len(ct) == 0 || len(ct)%aes.BlockSize != 0 {
+		return nil, errors.New("ciphertext not block aligned")
+	}
+	pt := make([]byte, len(ct))
+	cipher.NewCBCDecrypter(block, iv).CryptBlocks(pt, ct)
+	return unpad(pt)
+}
+
+func aesCBCEncrypt(key, iv, pt []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	ct := make([]byte, len(pad(pt)))
+	cipher.NewCBCEncrypter(block, iv).CryptBlocks(ct, pad(pt))
+	return ct, nil
+}
+
+func unpad(b []byte) ([]byte, error) {
+	if len(b) == 0 {
+		return nil, errors.New("empty plaintext")
+	}
+	n := int(b[len(b)-1])
+	if n == 0 || n > aes.BlockSize || n > len(b) {
+		return nil, errors.New("bad padding")
+	}
+	return b[:len(b)-n], nil
+}
+
+func pad(b []byte) []byte {
+	n := aes.BlockSize - len(b)%aes.BlockSize
+	out := make([]byte, len(b)+n)
+	copy(out, b)
+	for i := len(b); i < len(out); i++ {
+		out[i] = byte(n)
+	}
+	return out
+}

cli/cmd/smcli/main.go

@@ -0,0 +1,450 @@
+package main
+
+// smcli — KNELSecretsManager Go CLI (pure Go; replaces the upstream Rust bw binary).
+// Speaks the Bitwarden/Vaultwarden API against the self-hosted vault.
+//
+// Commands:
+//   login                          authenticate (SM_EMAIL/SM_PASSWORD/SM_SERVER env or flags)
+//   status                         show auth/key state
+//   list [pattern]                 list item names
+//   get <name> [--field KEY]       print decrypted item (or one field / KEY=VALUE block)
+//   env <name>                     print KEY=VALUE lines for `eval`/sourcing
+//   set <name> [k=v ...]           create/update a secure-note item from --file or inline k=v
+//   rm <name>                      delete item
+//   folders                        list folders
+//
+// State: SM_STATE_DIR (default ~/.config/smcli), files 0600.
+
+import (
+	"encoding/json"
+	"errors"
+	"flag"
+	"fmt"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+const stateVersion = 1
+
+type State struct {
+	Version    int    `json:"version"`
+	Server     string `json:"server"`
+	Email      string `json:"email"`
+	AccessToken string `json:"access_token"`
+	KDFType    int    `json:"kdf_type"`
+	KDFIter    uint32 `json:"kdf_iter"`
+	KDFMemory  uint32 `json:"kdf_memory"`
+	KDFParallel uint32 `json:"kdf_parallel"`
+	// MasterKey/StretchedKey/UserSymKey stored raw (hex) — file must be 0600.
+	MasterKey    string `json:"master_key"`
+	StretchedKey string `json:"stretched_key"`
+	UserSymKey   string `json:"user_sym_key"`
+}
+
+func stateDir() string {
+	if v := os.Getenv("SM_STATE_DIR"); v != "" {
+		return v
+	}
+	home, _ := os.UserHomeDir()
+	return filepath.Join(home, ".config", "smcli")
+}
+
+func statePath() string { return filepath.Join(stateDir(), "state.json") }
+
+func saveState(s *State) error {
+	if err := os.MkdirAll(stateDir(), 0o700); err != nil {
+		return err
+	}
+	b, err := json.Marshal(s)
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(statePath(), b, 0o600)
+}
+
+func loadState() (*State, error) {
+	b, err := os.ReadFile(statePath())
+	if err != nil {
+		return nil, err
+	}
+	var s State
+	if err := json.Unmarshal(b, &s); err != nil {
+		return nil, err
+	}
+	if s.Version != stateVersion {
+		return nil, errors.New("state version mismatch; re-login")
+	}
+	return &s, nil
+}
+
+func newClientFromState(s *State) (*Client, error) {
+	c := &Client{
+		Server: s.Server, Email: s.Email,
+		AccessToken: s.AccessToken,
+		KDFType: s.KDFType, KDFIter: s.KDFIter, KDFMemory: s.KDFMemory, KDFParallel: s.KDFParallel,
+		HTTP: &http.Client{Timeout: 30 * time.Second},
+	}
+	var err error
+	if c.MasterKey, err = fromHex(s.MasterKey); err != nil {
+		return nil, err
+	}
+	if c.StretchedKey, err = fromHex(s.StretchedKey); err != nil {
+		return nil, err
+	}
+	if c.UserSymKey, err = fromHex(s.UserSymKey); err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+func cmdLogin(server, email, password string) error {
+	c := &Client{Server: server, Email: email, Password: password,
+		HTTP: &http.Client{Timeout: 30 * time.Second}}
+	if err := c.Login(); err != nil {
+		return err
+	}
+	s := &State{
+		Version: stateVersion, Server: server, Email: email,
+		AccessToken: c.AccessToken,
+		KDFType: c.KDFType, KDFIter: c.KDFIter, KDFMemory: c.KDFMemory, KDFParallel: c.KDFParallel,
+		MasterKey:    toHex(c.MasterKey),
+		StretchedKey: toHex(c.StretchedKey),
+	}
+	if err := saveState(s); err != nil {
+		return err
+	}
+	// immediately decrypt the user sym key
+	if err := c.Unlock(); err != nil {
+		return err
+	}
+	s.UserSymKey = toHex(c.UserSymKey)
+	return saveState(s)
+}
+
+func cmdList(pattern string) error {
+	s, err := loadState()
+	if err != nil {
+		return err
+	}
+	c, err := newClientFromState(s)
+	if err != nil {
+		return err
+	}
+	raw, err := c.Sync()
+	if err != nil {
+		return err
+	}
+	var sync struct {
+		Ciphers []json.RawMessage `json:"ciphers"`
+	}
+	if err := json.Unmarshal(raw, &sync); err != nil {
+		return err
+	}
+	for _, r := range sync.Ciphers {
+		pc, err := DecryptCipher(c.UserSymKey, r)
+		if err != nil {
+			continue
+		}
+		if pattern == "" || strings.Contains(strings.ToLower(pc.Name), strings.ToLower(pattern)) {
+			fmt.Println(pc.Name)
+		}
+	}
+	return nil
+}
+
+func findCipher(c *Client, userKey []byte, name string) (*PlainCipher, json.RawMessage, error) {
+	raw, err := c.Sync()
+	if err != nil {
+		return nil, nil, err
+	}
+	var sync struct {
+		Ciphers []json.RawMessage `json:"ciphers"`
+	}
+	if err := json.Unmarshal(raw, &sync); err != nil {
+		return nil, nil, err
+	}
+	for _, r := range sync.Ciphers {
+		pc, err := DecryptCipher(userKey, r)
+		if err != nil || pc.Name != name {
+			continue
+		}
+		return pc, r, nil
+	}
+	return nil, nil, errors.New("item not found: " + name)
+}
+
+func rawCipherByID(raw []byte, id string) (*cipherRaw, error) {
+	var sync struct {
+		Ciphers []json.RawMessage `json:"ciphers"`
+	}
+	if err := json.Unmarshal(raw, &sync); err != nil {
+		return nil, err
+	}
+	for _, r := range sync.Ciphers {
+		var cr cipherRaw
+		if err := json.Unmarshal(r, &cr); err != nil {
+			continue
+		}
+		if cr.ID == id {
+			return &cr, nil
+		}
+	}
+	return nil, errors.New("cipher id not found: " + id)
+}
+
+func cmdGet(name, field string) error {
+	s, err := loadState()
+	if err != nil {
+		return err
+	}
+	c, err := newClientFromState(s)
+	if err != nil {
+		return err
+	}
+	pc, _, err := findCipher(c, c.UserSymKey, name)
+	if err != nil {
+		return err
+	}
+	if field != "" {
+		for _, f := range pc.Fields {
+			if f.Name == field {
+				fmt.Println(f.Value)
+				return nil
+			}
+		}
+		if field == "password" {
+			fmt.Println(pc.Login.Password)
+			return nil
+		}
+		if field == "username" {
+			fmt.Println(pc.Login.Username)
+			return nil
+		}
+		if field == "notes" {
+			fmt.Print(pc.Notes)
+			return nil
+		}
+		return fmt.Errorf("field not found: %s", field)
+	}
+	out, _ := json.MarshalIndent(pc, "", "  ")
+	fmt.Println(string(out))
+	return nil
+}
+
+func cmdEnv(name string) error {
+	s, err := loadState()
+	if err != nil {
+		return err
+	}
+	c, err := newClientFromState(s)
+	if err != nil {
+		return err
+	}
+	pc, _, err := findCipher(c, c.UserSymKey, name)
+	if err != nil {
+		return err
+	}
+	for _, f := range pc.Fields {
+		v := strings.ReplaceAll(f.Value, "'", "'\\''")
+		fmt.Printf("export %s='%s'\n", f.Name, v)
+	}
+	return nil
+}
+
+func cmdSet(name, file string, kv []string, folderID string) error {
+	s, err := loadState()
+	if err != nil {
+		return err
+	}
+	c, err := newClientFromState(s)
+	if err != nil {
+		return err
+	}
+	var fields []PlainField
+	if file != "" {
+		b, err := os.ReadFile(file)
+		if err != nil {
+			return err
+		}
+		fields = parseEnvFields(string(b))
+	}
+	for _, kv := range kv {
+		eq := strings.Index(kv, "=")
+		if eq <= 0 {
+			return fmt.Errorf("bad k=v: %s", kv)
+		}
+		fields = append(fields, PlainField{Type: 1, Name: kv[:eq], Value: kv[eq+1:]})
+	}
+	raw, err := c.Sync()
+	if err != nil {
+		return err
+	}
+	pc, _, err := findCipher(c, c.UserSymKey, name)
+	exists := err == nil
+	var payload map[string]any
+	if exists {
+		var cr *cipherRaw
+		cr, err = rawCipherByID(raw, pc.ID)
+		if err != nil {
+			return err
+		}
+		payload, err = BuildSecureNoteJSON(c.UserSymKey, name, folderID, pc.Notes, fields, cr)
+		if err != nil {
+			return err
+		}
+		_, err = c.EditCipher(pc.ID, payload)
+	} else {
+		payload, err = BuildSecureNoteJSON(c.UserSymKey, name, folderID, "", fields, nil)
+		if err != nil {
+			return err
+		}
+		_, err = c.CreateCipher(payload)
+	}
+	if err != nil {
+		return err
+	}
+	fmt.Println("ok:", name)
+	return nil
+}
+
+func cmdRm(name string) error {
+	s, err := loadState()
+	if err != nil {
+		return err
+	}
+	c, err := newClientFromState(s)
+	if err != nil {
+		return err
+	}
+	pc, raw, err := findCipher(c, c.UserSymKey, name)
+	if err != nil {
+		return err
+	}
+	var parsed map[string]any
+	_ = json.Unmarshal(raw, &parsed)
+	id, _ := parsed["id"].(string)
+	_ = pc
+	fmt.Println("deleted:", name)
+	return c.DeleteCipher(id)
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		usage()
+		os.Exit(1)
+	}
+	var err error
+	switch os.Args[1] {
+	case "login":
+		fs := flag.NewFlagSet("login", flag.ExitOnError)
+		server := fs.String("server", envOr("SM_SERVER", "https://pwvault.turnsys.com"), "vault server")
+		email := fs.String("email", os.Getenv("SM_EMAIL"), "account email")
+		password := fs.String("password", os.Getenv("SM_PASSWORD"), "master password (prefer env)")
+		_ = fs.Parse(os.Args[2:])
+		if *email == "" || *password == "" {
+			fatal("login needs SM_EMAIL and SM_PASSWORD (or -email/-password)")
+		}
+		err = cmdLogin(*server, *email, *password)
+	case "status":
+		s, e := loadState()
+		if e != nil {
+			fmt.Println("locked/absent:", e)
+			return
+		}
+		fmt.Printf("server=%s email=%s unlocked=%v\n", s.Server, s.Email, s.UserSymKey != "")
+	case "list":
+		pat := ""
+		if len(os.Args) > 2 {
+			pat = os.Args[2]
+		}
+		err = cmdList(pat)
+	case "get":
+		if len(os.Args) < 3 {
+			fatal("get <name> [--field KEY]")
+		}
+		field := ""
+		for i, a := range os.Args {
+			if a == "--field" && i+1 < len(os.Args) {
+				field = os.Args[i+1]
+			}
+		}
+		err = cmdGet(os.Args[2], field)
+	case "env":
+		if len(os.Args) < 3 {
+			fatal("env <name>")
+		}
+		err = cmdEnv(os.Args[2])
+	case "set":
+		fs := flag.NewFlagSet("set", flag.ExitOnError)
+		file := fs.String("file", "", "env file with KEY=VALUE lines")
+		folder := fs.String("folder", "", "folder id")
+		_ = fs.Parse(os.Args[2:])
+		rest := fs.Args()
+		if len(rest) < 1 {
+			fatal("set <name> [--file F] [k=v ...]")
+		}
+		err = cmdSet(rest[0], *file, rest[1:], *folder)
+	case "rm":
+		if len(os.Args) < 3 {
+			fatal("rm <name>")
+		}
+		err = cmdRm(os.Args[2])
+	case "folders":
+		s, e := loadState()
+		if e != nil {
+			fatal(e)
+		}
+		c, e := newClientFromState(s)
+		if e != nil {
+			fatal(e)
+		}
+		raw, e := c.Sync()
+		if e != nil {
+			fatal(e)
+		}
+		var sync struct {
+			Folders []struct {
+				ID   string `json:"id"`
+				Name string `json:"name"`
+			} `json:"folders"`
+		}
+		_ = json.Unmarshal(raw, &sync)
+		for _, f := range sync.Folders {
+			fmt.Println(f.ID, f.Name)
+		}
+	default:
+		usage()
+		os.Exit(1)
+	}
+	if err != nil {
+		fatal(err)
+	}
+}
+
+func envOr(k, def string) string {
+	if v := os.Getenv(k); v != "" {
+		return v
+	}
+	return def
+}
+
+func fatal(v any) {
+	fmt.Fprintln(os.Stderr, "smcli:", v)
+	os.Exit(1)
+}
+
+func usage() {
+	fmt.Fprint(os.Stderr, `smcli — KNELSecretsManager Go CLI (Bitwarden/Vaultwarden)
+  login                        authenticate (SM_EMAIL/SM_PASSWORD/SM_SERVER)
+  status                       auth/key state
+  list [pattern]               list item names
+  get <name> [--field KEY]     decrypt item / field
+  env <name>                   print export KEY='VALUE' lines (sourcable)
+  set <name> [--file F] k=v    create/update secure note with hidden fields
+  rm <name>                    delete item
+  folders                      list folders
+`)
+}

cli/cmd/smcli/model.go

@@ -0,0 +1,203 @@
+package main
+
+// Cipher model: decrypt/encrypt for the operations the lane uses
+// (secure notes with hidden fields; login items for password fields).
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+// encStr handles empty/unset gracefully.
+type encFunc func(string) (string, error)
+
+type CipherField struct {
+	Type  int     `json:"type"` // 0=text, 1=hidden, 2=boolean (Bitwarden field type)
+	Name  *string `json:"name,omitempty"`
+	Value *string `json:"value,omitempty"`
+}
+
+type CipherLogin struct {
+	Username *string `json:"username,omitempty"`
+	Password *string `json:"password,omitempty"`
+	URIs     []any   `json:"uris,omitempty"`
+}
+
+type cipherRaw struct {
+	ID            string                 `json:"id"`
+	OrganizationID *string               `json:"organizationId"`
+	Type          int                    `json:"type"` // 1=login, 2=secureNote
+	Name          string                 `json:"name"`
+	Notes         *string                `json:"notes"`
+	Fields        []CipherField          `json:"fields,omitempty"`
+	Key           *string                `json:"key,omitempty"`
+	Login         *CipherLogin           `json:"login,omitempty"`
+	SecureNote    map[string]any         `json:"secureNote,omitempty"`
+	DeletedDate   *string                `json:"deletedDate,omitempty"`
+	Extra         map[string]interface{} `json:"-"`
+}
+
+// cipherKeyFor returns the 64B key to use for a cipher's data.
+func cipherKeyFor(userKey []byte, encKey *string) ([]byte, error) {
+	if encKey == nil || *encKey == "" {
+		return userKey, nil
+	}
+	es, err := ParseEncString(*encKey)
+	if err != nil {
+		return nil, err
+	}
+	return symDecrypt(userKey, es)
+}
+
+func decStr(userKey []byte, cipherKey []byte, s *string) (string, error) {
+	if s == nil || *s == "" {
+		return "", nil
+	}
+	es, err := ParseEncString(*s)
+	if err != nil {
+		return "", err
+	}
+	pt, err := symDecrypt(cipherKey, es)
+	if err != nil {
+		return "", err
+	}
+	return string(pt), nil
+}
+
+func encStr(userKey []byte, s string) (string, error) {
+	if s == "" {
+		return "", nil
+	}
+	return symEncrypt(userKey, []byte(s))
+}
+
+// PlainField is a decrypted custom field.
+type PlainField struct {
+	Type  int    `json:"type"`
+	Name  string `json:"name"`
+	Value string `json:"value"`
+}
+
+// PlainCipher is a decrypted item view.
+type PlainCipher struct {
+	ID     string       `json:"id"`
+	Name   string       `json:"name"`
+	Notes  string       `json:"notes"`
+	Type   int          `json:"type"`
+	Fields []PlainField `json:"fields"`
+	Login  struct {
+		Username string `json:"username"`
+		Password string `json:"password"`
+	} `json:"login"`
+	FolderID string `json:"folderId"`
+}
+
+// DecryptCipher converts a raw sync cipher into PlainCipher.
+func DecryptCipher(userKey []byte, raw []byte) (*PlainCipher, error) {
+	var cr cipherRaw
+	if err := json.Unmarshal(raw, &cr); err != nil {
+		return nil, err
+	}
+	if cr.DeletedDate != nil {
+		return nil, fmt.Errorf("deleted")
+	}
+	ck, err := cipherKeyFor(userKey, cr.Key)
+	if err != nil {
+		return nil, err
+	}
+	pc := &PlainCipher{ID: cr.ID, Type: cr.Type}
+	if pc.Name, err = decStr(userKey, ck, &cr.Name); err != nil {
+		return nil, fmt.Errorf("name: %w", err)
+	}
+	if cr.Notes != nil {
+		if pc.Notes, err = decStr(userKey, ck, cr.Notes); err != nil {
+			return nil, fmt.Errorf("notes: %w", err)
+		}
+	}
+	for _, f := range cr.Fields {
+		pf := PlainField{Type: f.Type}
+		if pf.Name, err = decStr(userKey, ck, f.Name); err != nil {
+			continue
+		}
+		if pf.Value, err = decStr(userKey, ck, f.Value); err != nil {
+			continue
+		}
+		pc.Fields = append(pc.Fields, pf)
+	}
+	if cr.Login != nil {
+		if cr.Login.Username != nil {
+			pc.Login.Username, _ = decStr(userKey, ck, cr.Login.Username)
+		}
+		if cr.Login.Password != nil {
+			pc.Login.Password, _ = decStr(userKey, ck, cr.Login.Password)
+		}
+	}
+	return pc, nil
+}
+
+// BuildSecureNoteJSON produces an encrypted create/update payload for a
+// secure-note item with hidden fields (type 1).
+func BuildSecureNoteJSON(userKey []byte, name, folderID, notes string, fields []PlainField, existing *cipherRaw) (map[string]any, error) {
+	nameEnc, err := encStr(userKey, name)
+	if err != nil {
+		return nil, err
+	}
+	notesEnc, err := encStr(userKey, notes)
+	if err != nil {
+		return nil, err
+	}
+	var encFields []map[string]any
+	for _, f := range fields {
+		fn, err := encStr(userKey, f.Name)
+		if err != nil {
+			return nil, err
+		}
+		fv, err := encStr(userKey, f.Value)
+		if err != nil {
+			return nil, err
+		}
+		encFields = append(encFields, map[string]any{
+			"type": f.Type,
+			"name": fn,
+			"value": fv,
+		})
+	}
+	payload := map[string]any{
+		"type":       2,
+		"name":       nameEnc,
+		"notes":      notesEnc,
+		"fields":     encFields,
+		"secureNote": map[string]any{"type": 0},
+	}
+	if folderID != "" {
+		payload["folderId"] = folderID
+	}
+	if existing != nil {
+		payload["id"] = existing.ID
+		if existing.OrganizationID != nil {
+			payload["organizationId"] = existing.OrganizationID
+		}
+	}
+	return payload, nil
+}
+
+// parseEnvFields parses KEY=VALUE lines (quoted or bare) into hidden fields.
+func parseEnvFields(text string) []PlainField {
+	var out []PlainField
+	for _, line := range strings.Split(text, "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		eq := strings.Index(line, "=")
+		if eq <= 0 {
+			continue
+		}
+		k := line[:eq]
+		v := line[eq+1:]
+		v = strings.Trim(v, "'\"")
+		out = append(out, PlainField{Type: 1, Name: k, Value: v})
+	}
+	return out
+}

cli/cmd/smcli/totp.go

@@ -0,0 +1,34 @@
+package main
+
+// RFC 6238 TOTP (SHA1, 30s, 6 digits) for Bitwarden 2FA provider 0.
+
+import (
+	"crypto/hmac"
+	"crypto/sha1"
+	"encoding/base32"
+	"encoding/binary"
+	"fmt"
+	"strings"
+	"time"
+)
+
+func totpNow(secretB32 string, at time.Time) (string, error) {
+	secret := strings.ToUpper(strings.ReplaceAll(strings.ReplaceAll(secretB32, " ", ""), "-", ""))
+	pad := len(secret) % 8
+	if pad != 0 {
+		secret += strings.Repeat("=", 8-pad)
+	}
+	key, err := base32.StdEncoding.DecodeString(secret)
+	if err != nil {
+		return "", err
+	}
+	counter := uint64(at.Unix()) / 30
+	var ctr [8]byte
+	binary.BigEndian.PutUint64(ctr[:], counter)
+	h := hmac.New(sha1.New, key)
+	h.Write(ctr[:])
+	sum := h.Sum(nil)
+	off := sum[len(sum)-1] & 0x0f
+	code := (binary.BigEndian.Uint32(sum[off:off+4]) & 0x7fffffff) % 1000000
+	return fmt.Sprintf("%06d", code), nil
+}

cli/cmd/smcli/util.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"os"
+)
+
+func toHex(b []byte) string { return hex.EncodeToString(b) }
+
+func fromHex(s string) ([]byte, error) {
+	return hex.DecodeString(s)
+}
+
+func hostnameSafe() string {
+	h, err := os.Hostname()
+	if err != nil {
+		return "unknown"
+	}
+	return h
+}
+
+func sha256Sum(b []byte) []byte {
+	s := sha256.Sum256(b)
+	return s[:]
+}