uncle6me-web
8e9bd09072
真因：零件（main.go）給 host function 的接收緩衝區是固定大小（http_request 64KB、
claude_api 1MB）。回應超過這個大小時，wasi-shim 的 writeOut 照寫不誤：
new Uint8Array(buf, outPtr, data.length).set(data)
data 比零件的 outBuf 大 → 覆寫零件堆積體，零件接著 outBuf[:outLen] 切片 panic；
或 writeOut 撞 memory 邊界丟例外 → 回 1 → 零件印一句 "HTTP request failed"。
使用者照那句去查連線／URL／防火牆，方向全錯。
修法（容量握手，不改 host function 簽名、向後相容）：
- 零件呼叫前把 outBuf 長度預先寫進 *outLenPtr（宣告容量）
- host 在寫回前讀這個值當上限；塞不下就**不寫**（不再覆寫零件記憶體），回新的
HOST_TOO_LARGE=3
- http_request host fn 收到 3 → 改寫一段講真話的 error envelope（實際大小＋上限＋
「不是連線失敗」＋分頁/篩選的具體做法＋機器可讀 code/actual_bytes/limit_bytes），
沿用既有 parsed["error"] 判定鏈原樣送到使用者面前
- 舊零件沒宣告容量（讀到 0）→ 維持舊行為。不可硬套 64KB 預設：各零件緩衝區大小不同，
硬套會把原本正常的大回應誤判成「太大」，那只是換一種說謊
同一條路徑上另一個「訊息與真因脫節」一併修：component-loader 的 makeHttpRunner
`try res.json() catch res.text()`，在零件回非 JSON 時 body 已被消費 → 丟
"Body has already been used"，與真因無關（同檔 readBodyOnce 的註解早就寫明這個坑）。
改成只讀一次。
驗證狀態（誠實標示，mindset §7）：
- 通：5 顆零件 tinygo build 全過，wasm 已重編進 .component-builds/
（claude_api 依 .gitignore 慣例不入庫，由部署端重編）
- 未跑：runtime 驗證。本 session 的權限層擋掉 node/vitest/wasmtime，
before/after 實測輸出待人跑 scripts/repro-oversize-response.mjs
- 未做：.worker-builds/ 重編（需 node scripts/build-worker-artifacts.mjs），
否則修法不會進 self-hosted 安裝路徑（Arcrun#93 同款陷阱）
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
509 lines
16 KiB
Go
509 lines
16 KiB
Go
// auth_service_account — Google Service Account JWT auth primitive
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//
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// 讀取 auth_recipe:{service} + 解密 service_account_json + 組 JWT + RS256 簽章(透過 host)
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// + token exchange → access_token + 展開 {{runtime.access_token}}。
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//
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// Host imports:
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// - u6u.kv_get — 讀 RECIPES + CREDENTIALS_KV
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// - u6u.crypto_decrypt — AES-GCM 解密 service account JSON
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// - u6u.crypto_sign_rs256 — RSASSA-PKCS1-v1_5 + SHA-256 (PKCS8 private key)
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// - u6u.http_request — POST token exchange endpoint
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//
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//go:build tinygo
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package main
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import (
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"encoding/base64"
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"encoding/json"
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"io"
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"net/url"
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"os"
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"strconv"
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"strings"
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"time"
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"unsafe"
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)
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// host function 回傳碼，與 cypher-executor/src/lib/wasi-shim.ts 的 HOST_* 同一組。
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const (
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hostOK uint32 = 0
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hostError uint32 = 1
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hostTooLarge uint32 = 3 // 資料塞不進零件宣告的接收緩衝區（Arcrun#92）
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)
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// ── host function 宣告 ───────────────────────────────────────────────────────
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//go:wasmimport u6u kv_get
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func hostKvGet(
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keyPtr uintptr, keyLen uint32,
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outPtr uintptr, outLenPtr uintptr,
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) uint32
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//go:wasmimport u6u crypto_decrypt
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func hostCryptoDecrypt(
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encPtr uintptr, encLen uint32,
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ivPtr uintptr, ivLen uint32,
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outPtr uintptr, outLenPtr uintptr,
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) uint32
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//go:wasmimport u6u crypto_sign_rs256
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func hostCryptoSignRS256(
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dataPtr uintptr, dataLen uint32,
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pkcs8Ptr uintptr, pkcs8Len uint32,
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outPtr uintptr, outLenPtr uintptr,
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) uint32
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//go:wasmimport u6u http_request
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func hostHttpRequest(
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urlPtr uintptr, urlLen uint32,
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methodPtr uintptr, methodLen uint32,
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headersPtr uintptr, headersLen uint32,
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bodyPtr uintptr, bodyLen uint32,
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outPtr uintptr, outLenPtr uintptr,
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) uint32
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// ── 型別 ─────────────────────────────────────────────────────────────────────
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type Input struct {
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Action string `json:"action"`
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APIKey string `json:"api_key"`
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Service string `json:"service"`
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Request json.RawMessage `json:"request,omitempty"`
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// ResolvedSecrets：credential-store 遷移 T6/T7 方案 A（D19）——cypher-executor 從自己的
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// per-script secrets（新家）用 secret_get(D1 ref) 取到的明文，key = credential name
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// （對 SA 而言就是 required_secrets[0].key）。有值優先用，沒有才 fallback 舊 KV+crypto_decrypt。
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// default（此欄空/nil）行為完全等於遷移前的舊碼。
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ResolvedSecrets map[string]string `json:"resolved_secrets,omitempty"`
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}
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type SecretRequirement struct {
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Key string `json:"key"`
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Label string `json:"label"`
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Optional bool `json:"optional,omitempty"`
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}
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type AuthInjectSpec struct {
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Header map[string]string `json:"header,omitempty"`
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Query map[string]string `json:"query,omitempty"`
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Body map[string]string `json:"body,omitempty"`
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}
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type TokenExchange struct {
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Endpoint string `json:"endpoint"`
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Scopes []string `json:"scopes"`
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}
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type AuthRecipe struct {
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Kind string `json:"kind"`
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Service string `json:"service"`
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Primitive string `json:"primitive"`
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ServiceAccountKind string `json:"service_account_kind,omitempty"`
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TokenExchange *TokenExchange `json:"token_exchange,omitempty"`
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RequiredSecrets []SecretRequirement `json:"required_secrets"`
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Inject AuthInjectSpec `json:"inject"`
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}
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type EncryptedRecord struct {
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Encrypted string `json:"encrypted"`
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IV string `json:"iv"`
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}
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type ServiceAccountJSON struct {
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ClientEmail string `json:"client_email"`
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PrivateKey string `json:"private_key"`
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}
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type JWTHeader struct {
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Alg string `json:"alg"`
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Typ string `json:"typ"`
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}
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type JWTPayload struct {
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Iss string `json:"iss"`
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Sub string `json:"sub"`
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Aud string `json:"aud"`
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Scope string `json:"scope"`
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Iat int64 `json:"iat"`
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Exp int64 `json:"exp"`
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}
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// ── main ─────────────────────────────────────────────────────────────────────
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func main() {
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raw, err := io.ReadAll(os.Stdin)
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if err != nil {
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writeError("failed to read stdin: " + err.Error())
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return
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}
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var input Input
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if err := json.Unmarshal(raw, &input); err != nil {
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writeError("invalid input JSON: " + err.Error())
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return
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}
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if input.APIKey == "" {
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writeError("api_key 必填")
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return
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}
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if input.Service == "" {
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writeError("service 必填")
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return
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}
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if input.Action != "" && input.Action != "authenticate" {
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writeError("auth_service_account 僅支援 action=authenticate")
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return
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}
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// 1. 讀 auth recipe
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recipeJSON, status := kvGet("auth_recipe:" + input.Service)
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if status == 2 {
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writeError("找不到 auth recipe: " + input.Service)
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return
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}
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if status != 0 {
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writeError("kv_get 失敗(auth_recipe)")
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return
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}
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var recipe AuthRecipe
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if err := json.Unmarshal([]byte(recipeJSON), &recipe); err != nil {
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writeError("auth recipe JSON 解析失敗: " + err.Error())
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return
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}
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if recipe.Primitive != "service_account" {
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writeError("auth recipe " + input.Service + " 的 primitive 不是 service_account (是 " + recipe.Primitive + ")")
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return
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}
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if recipe.ServiceAccountKind != "google_jwt" {
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writeError("auth recipe " + input.Service + " 的 service_account_kind 必須是 google_jwt,實際: " + recipe.ServiceAccountKind)
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return
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}
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if recipe.TokenExchange == nil || recipe.TokenExchange.Endpoint == "" {
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writeError("auth recipe " + input.Service + " 缺少 token_exchange.endpoint")
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return
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}
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if len(recipe.RequiredSecrets) == 0 {
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writeError("auth recipe " + input.Service + " 缺少 required_secrets[0](SA JSON)")
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return
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}
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// 2. 取得 service account JSON 明文 (慣例:required_secrets[0] 是 SA JSON)
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saReq := recipe.RequiredSecrets[0]
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var saJSONStr string
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// T6 方案 A：cypher 已從新家（per-script secrets）取到明文就直接用，不走 KV。
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// input.ResolvedSecrets 為 nil 時此 map 讀取回 ("", false)，行為與遷移前一致。
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if v, ok := input.ResolvedSecrets[saReq.Key]; ok {
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saJSONStr = v
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} else {
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// T7 雙讀 fallback：新家沒給 → 舊路徑 kv_get + crypto_decrypt。
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kvKey := input.APIKey + ":cred:" + saReq.Key
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encJSON, s := kvGet(kvKey)
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if s == 2 {
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writeError("缺少 credential: " + saReq.Key + " (" + saReq.Label + ")。修復: 編輯 credentials.yaml 後執行 acr creds push")
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return
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}
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if s != 0 {
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writeError("kv_get 失敗(credential " + saReq.Key + ")")
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return
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}
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var rec EncryptedRecord
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if err := json.Unmarshal([]byte(encJSON), &rec); err != nil {
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writeError("credential " + saReq.Key + " 格式錯誤: " + err.Error())
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return
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}
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decrypted, ok := cryptoDecrypt(rec.Encrypted, rec.IV)
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if !ok {
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writeError("credential " + saReq.Key + " 解密失敗")
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return
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}
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saJSONStr = decrypted
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}
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// 3. 解析 service account JSON
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var sa ServiceAccountJSON
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if err := json.Unmarshal([]byte(saJSONStr), &sa); err != nil {
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writeError("service account JSON 格式錯誤: " + err.Error())
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return
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}
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if sa.ClientEmail == "" || sa.PrivateKey == "" {
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writeError("service account JSON 缺少 client_email 或 private_key")
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return
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}
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// 4. PEM → PKCS8 bytes (去 header/footer + base64 decode)
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pkcs8, err := pemToPkcs8(sa.PrivateKey)
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if err != nil {
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writeError("解析 service account private key 失敗: " + err.Error())
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return
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}
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// 5. 組 JWT header + payload (base64url-encoded)
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now := time.Now().Unix()
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header := JWTHeader{Alg: "RS256", Typ: "JWT"}
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payload := JWTPayload{
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Iss: sa.ClientEmail,
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Sub: sa.ClientEmail,
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Aud: recipe.TokenExchange.Endpoint,
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Scope: strings.Join(recipe.TokenExchange.Scopes, " "),
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Iat: now,
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Exp: now + 3600,
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}
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headerBytes, _ := json.Marshal(header)
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payloadBytes, _ := json.Marshal(payload)
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signingInput := base64.RawURLEncoding.EncodeToString(headerBytes) + "." +
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base64.RawURLEncoding.EncodeToString(payloadBytes)
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// 6. 呼叫 host 簽章 (RSASSA-PKCS1-v1_5 + SHA-256)
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signature, ok := cryptoSignRS256([]byte(signingInput), pkcs8)
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if !ok {
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writeError("JWT 簽章失敗(host function crypto_sign_rs256 回傳錯誤)")
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return
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}
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jwt := signingInput + "." + base64.RawURLEncoding.EncodeToString(signature)
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// 7. token exchange:POST form-urlencoded 到 token_exchange.endpoint
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form := url.Values{}
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form.Set("grant_type", "urn:ietf:params:oauth:grant-type:jwt-bearer")
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form.Set("assertion", jwt)
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formBody := form.Encode()
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headersJSON := `{"Content-Type":"application/x-www-form-urlencoded"}`
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respStr, code := httpRequest(recipe.TokenExchange.Endpoint, "POST", headersJSON, formBody)
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if code == hostTooLarge {
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writeError("token exchange 的回應太大，裝不下：超過這個零件單次能接收的 64 KB 上限。" +
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"這不是連線失敗——請求有送出去、對方也有回，只是整包塞不進零件。" +
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"多半表示 " + recipe.TokenExchange.Endpoint + " 回的不是正常的 token JSON" +
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"（例如回了一整頁 HTML 錯誤頁）；請確認 auth recipe 的 token_exchange.endpoint 正確。")
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return
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}
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if code != hostOK {
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writeError("token exchange 沒有拿到回應：引擎的 host function 回傳錯誤碼 " +
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strconv.Itoa(int(code)) + "（0=成功 1=引擎端錯誤 3=回應太大）。這是引擎側的問題。")
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return
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}
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var tokenResp struct {
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AccessToken string `json:"access_token"`
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Error string `json:"error"`
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ErrorDesc string `json:"error_description"`
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}
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if err := json.Unmarshal([]byte(respStr), &tokenResp); err != nil {
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writeError("token exchange 回應解析失敗: " + err.Error() + " (raw: " + respStr + ")")
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return
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}
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if tokenResp.AccessToken == "" {
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errMsg := tokenResp.Error
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if tokenResp.ErrorDesc != "" {
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errMsg += ": " + tokenResp.ErrorDesc
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}
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if errMsg == "" {
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errMsg = "access_token 為空 (raw: " + respStr + ")"
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}
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writeError("token exchange 失敗: " + errMsg)
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return
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}
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// 8. 展開模板 (service_account 不用 secret.*,只用 runtime.access_token)
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secrets := map[string]string{}
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runtime := map[string]string{"access_token": tokenResp.AccessToken}
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authHeaders := interpolateRecord(recipe.Inject.Header, secrets, runtime)
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authQuery := interpolateRecord(recipe.Inject.Query, secrets, runtime)
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authBody := interpolateRecord(recipe.Inject.Body, secrets, runtime)
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out, _ := json.Marshal(map[string]interface{}{
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"success": true,
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"auth_headers": authHeaders,
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"auth_query": authQuery,
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"auth_body": authBody,
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"runtime": runtime,
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})
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os.Stdout.Write(out)
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}
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// ── helpers ──────────────────────────────────────────────────────────────────
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func writeError(msg string) {
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out, _ := json.Marshal(map[string]interface{}{
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"success": false,
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"error": msg,
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"auth_headers": map[string]string{},
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"auth_query": map[string]string{},
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"auth_body": map[string]string{},
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})
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os.Stdout.Write(out)
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}
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// pemToPkcs8 從 PEM 取出 base64 body 再 decode 成 bytes。
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// 支援 "BEGIN PRIVATE KEY" / "BEGIN RSA PRIVATE KEY"(SA JSON 幾乎都是前者)。
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func pemToPkcs8(pem string) ([]byte, error) {
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// 移除所有 BEGIN/END 行與空白
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lines := strings.Split(pem, "\n")
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var b strings.Builder
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for _, line := range lines {
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l := strings.TrimSpace(line)
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if l == "" {
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continue
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}
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if strings.HasPrefix(l, "-----BEGIN") || strings.HasPrefix(l, "-----END") {
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continue
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}
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b.WriteString(l)
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}
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cleaned := strings.ReplaceAll(b.String(), "\\n", "") // 防呆:JSON-escaped newline
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return base64.StdEncoding.DecodeString(cleaned)
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}
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// kvGet 呼叫 host function,回傳 (value, status)。
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// status: 0=成功 1=錯誤 2=找不到 3=值太大塞不進 outBuf（Arcrun#92）
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func kvGet(key string) (string, uint32) {
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keyBytes := []byte(key)
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outBuf := make([]byte, 65536)
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outLen := uint32(len(outBuf)) // 容量握手（Arcrun#92），見 wasi-shim.ts writeOut
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status := hostKvGet(
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uintptr(unsafe.Pointer(&keyBytes[0])), uint32(len(keyBytes)),
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uintptr(unsafe.Pointer(&outBuf[0])), uintptr(unsafe.Pointer(&outLen)),
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)
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if status != 0 {
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return "", status
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}
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return string(outBuf[:outLen]), 0
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}
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func cryptoDecrypt(encB64, ivB64 string) (string, bool) {
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encBytes := []byte(encB64)
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ivBytes := []byte(ivB64)
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outBuf := make([]byte, 65536)
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outLen := uint32(len(outBuf)) // 容量握手（Arcrun#92）
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if len(encBytes) == 0 || len(ivBytes) == 0 {
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return "", false
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}
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status := hostCryptoDecrypt(
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uintptr(unsafe.Pointer(&encBytes[0])), uint32(len(encBytes)),
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uintptr(unsafe.Pointer(&ivBytes[0])), uint32(len(ivBytes)),
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uintptr(unsafe.Pointer(&outBuf[0])), uintptr(unsafe.Pointer(&outLen)),
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)
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if status != 0 {
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return "", false
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}
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return string(outBuf[:outLen]), true
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}
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// cryptoSignRS256 呼叫 host,回傳簽章 bytes
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func cryptoSignRS256(data, pkcs8 []byte) ([]byte, bool) {
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if len(data) == 0 || len(pkcs8) == 0 {
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return nil, false
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}
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outBuf := make([]byte, 1024) // RSA-2048 簽章 = 256 bytes,1KB 綽綽有餘
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outLen := uint32(len(outBuf)) // 容量握手（Arcrun#92）
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status := hostCryptoSignRS256(
|
||
uintptr(unsafe.Pointer(&data[0])), uint32(len(data)),
|
||
uintptr(unsafe.Pointer(&pkcs8[0])), uint32(len(pkcs8)),
|
||
uintptr(unsafe.Pointer(&outBuf[0])), uintptr(unsafe.Pointer(&outLen)),
|
||
)
|
||
if status != 0 {
|
||
return nil, false
|
||
}
|
||
return outBuf[:outLen], true
|
||
}
|
||
|
||
// httpRequest 呼叫 host,回傳 (response body 字串, host function 回傳碼)。
|
||
// 回傳碼與 wasi-shim.ts 的 HOST_* 同一組：0=成功 1=引擎端錯誤 3=回應塞不下緩衝區。
|
||
// 不再只回 bool 的理由（Arcrun#92）：bool 把「連不上」與「回應太大」講成同一句話。
|
||
func httpRequest(url, method, headersJSON, body string) (string, uint32) {
|
||
urlBytes := []byte(url)
|
||
methodBytes := []byte(method)
|
||
headersBytes := []byte(headersJSON)
|
||
bodyBytes := []byte(body)
|
||
|
||
if len(urlBytes) == 0 {
|
||
return "", hostError
|
||
}
|
||
|
||
outBuf := make([]byte, 65536)
|
||
outLen := uint32(len(outBuf)) // 容量握手（Arcrun#92）
|
||
|
||
// bodyBytes 可能為空(GET),host function 允許 len=0
|
||
var bodyPtr uintptr
|
||
if len(bodyBytes) > 0 {
|
||
bodyPtr = uintptr(unsafe.Pointer(&bodyBytes[0]))
|
||
}
|
||
var headersPtr uintptr
|
||
if len(headersBytes) > 0 {
|
||
headersPtr = uintptr(unsafe.Pointer(&headersBytes[0]))
|
||
}
|
||
|
||
status := hostHttpRequest(
|
||
uintptr(unsafe.Pointer(&urlBytes[0])), uint32(len(urlBytes)),
|
||
uintptr(unsafe.Pointer(&methodBytes[0])), uint32(len(methodBytes)),
|
||
headersPtr, uint32(len(headersBytes)),
|
||
bodyPtr, uint32(len(bodyBytes)),
|
||
uintptr(unsafe.Pointer(&outBuf[0])), uintptr(unsafe.Pointer(&outLen)),
|
||
)
|
||
if status != 0 {
|
||
return "", status
|
||
}
|
||
return string(outBuf[:outLen]), hostOK
|
||
}
|
||
|
||
// interpolateTemplate 展開 {{secret.X}} 與 {{runtime.X}}。未知 key 展開為空字串。
|
||
// 其他 namespace 的 {{...}} 原樣保留。
|
||
func interpolateTemplate(template string, secrets, runtime map[string]string) string {
|
||
var b strings.Builder
|
||
b.Grow(len(template))
|
||
i := 0
|
||
for i < len(template) {
|
||
start := strings.Index(template[i:], "{{")
|
||
if start < 0 {
|
||
b.WriteString(template[i:])
|
||
break
|
||
}
|
||
b.WriteString(template[i : i+start])
|
||
openIdx := i + start
|
||
closeRel := strings.Index(template[openIdx+2:], "}}")
|
||
if closeRel < 0 {
|
||
b.WriteString(template[openIdx:])
|
||
break
|
||
}
|
||
inner := template[openIdx+2 : openIdx+2+closeRel]
|
||
advance := openIdx + 2 + closeRel + 2
|
||
|
||
switch {
|
||
case strings.HasPrefix(inner, "secret."):
|
||
key := inner[len("secret."):]
|
||
b.WriteString(secrets[key])
|
||
case strings.HasPrefix(inner, "runtime."):
|
||
key := inner[len("runtime."):]
|
||
b.WriteString(runtime[key])
|
||
default:
|
||
b.WriteString(template[openIdx:advance])
|
||
}
|
||
i = advance
|
||
}
|
||
return b.String()
|
||
}
|
||
|
||
func interpolateRecord(
|
||
record map[string]string,
|
||
secrets, runtime map[string]string,
|
||
) map[string]string {
|
||
if record == nil {
|
||
return map[string]string{}
|
||
}
|
||
result := make(map[string]string, len(record))
|
||
for k, v := range record {
|
||
result[k] = interpolateTemplate(v, secrets, runtime)
|
||
}
|
||
return result
|
||
}
|