fix(billing): resolve all audit findings — CSRF, float precision, TOCTOU, error sanitization
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- Add CSRF token protection for mock payment (SHA256 + constant-time verify) - Replace f64 currency conversion with pure integer string parsing (parse_yuan_to_cents) - Move subscription check inside transaction to prevent TOCTOU race - Rewrite increment_usage to use atomic SQL (account_id+period_start WHERE) - Add trade_no format validation in payment callback - Sanitize error messages to prevent sensitive data leakage - Use i32::try_from for WeChat amount conversion (prevent truncation) - Replace window.__ZCLAW_STATS_SYNC_INTERVAL__ with useRef pattern - Replace eprintln/println with tracing macros in lifecycle - Remove unused variable in scheduler - Remove duplicate sha2 and unused hmac from Cargo.toml
This commit is contained in:
iven
@@ -2,9 +2,11 @@
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use axum::{
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extract::{Extension, Form, Path, Query, State},
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http::StatusCode,
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Json,
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};
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use serde::Deserialize;
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use sha2::Sha256;
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use crate::auth::types::AuthContext;
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use crate::error::{SaasError, SaasResult};
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@@ -78,7 +80,7 @@ pub async fn increment_usage_dimension(
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// 验证维度白名单
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if !["hand_executions", "pipeline_runs", "relay_requests"].contains(&req.dimension.as_str()) {
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return Err(SaasError::InvalidInput(
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format!("无效的用量维度: {}，支持: hand_executions / pipeline_runs / relay_requests", req.dimension)
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"无效的用量维度，支持: hand_executions / pipeline_runs / relay_requests".into()
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));
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}
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@@ -157,6 +159,12 @@ pub async fn payment_callback(
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SaasError::InvalidInput("回调缺少交易号".into())
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})?;
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// 验证 trade_no 格式（防伪造）
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if !trade_no.starts_with("ZCLAW-") || trade_no.len() > 64 {
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tracing::warn!("Payment callback invalid trade_no format: method={}", method);
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return Ok("fail".into());
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}
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if let Err(e) = super::payment::handle_payment_callback(&state.db, &trade_no, &status, callback_amount).await {
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// 对外返回通用错误，不泄露内部细节
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tracing::error!("Payment callback processing failed: method={}, error={}", method, e);
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@@ -189,6 +197,9 @@ pub async fn mock_pay_page(
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let safe_trade_no = html_escape(¶ms.trade_no);
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let amount_yuan = params.amount as f64 / 100.0;
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// CSRF token: HMAC(trade_no + amount) using dev-mode key
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let csrf_token = generate_mock_csrf_token(¶ms.trade_no, params.amount);
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axum::response::Html(format!(r#"
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<!DOCTYPE html>
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<html lang="zh">
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@@ -202,9 +213,11 @@ body {{ font-family: system-ui; max-width: 480px; margin: 40px auto; padding: 20
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.btn-pay:hover {{ background: #0958d9; }}
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.btn-fail {{ background: #f5f5f5; color: #999; }}
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.subject {{ text-align: center; color: #666; font-size: 14px; }}
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.dev-badge {{ display: inline-block; background: #fff3cd; color: #856404; padding: 2px 8px; border-radius: 4px; font-size: 11px; margin-bottom: 12px; }}
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</style></head>
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<body>
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<div class="card">
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<div style="text-align:center"><span class="dev-badge">DEV MODE</span></div>
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<div class="subject">{safe_subject}</div>
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<div class="amount">¥{amount_yuan}</div>
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<div style="text-align:center;color:#999;font-size:12px;margin-bottom:16px;">
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@@ -212,6 +225,7 @@ body {{ font-family: system-ui; max-width: 480px; margin: 40px auto; padding: 20
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</div>
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<form action="/api/v1/billing/mock-pay/confirm" method="POST">
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<input type="hidden" name="trade_no" value="{safe_trade_no}" />
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<input type="hidden" name="csrf_token" value="{csrf_token}" />
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<button type="submit" name="action" value="success" class="btn btn-pay">确认支付 ¥{amount_yuan}</button>
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<button type="submit" name="action" value="fail" class="btn btn-fail">模拟失败</button>
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</form>
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@@ -224,6 +238,7 @@ body {{ font-family: system-ui; max-width: 480px; margin: 40px auto; padding: 20
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pub struct MockPayConfirm {
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trade_no: String,
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action: String,
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csrf_token: String,
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}
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/// POST /api/v1/billing/mock-pay/confirm — Mock 支付确认
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@@ -231,6 +246,14 @@ pub async fn mock_pay_confirm(
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State(state): State<AppState>,
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Form(form): Form<MockPayConfirm>,
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) -> SaasResult<axum::response::Html<String>> {
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// 验证 CSRF token（防跨站请求伪造）
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// trade_no 格式 "ZCLAW-YYYYMMDDHHMMSS-xxxxxxxx"，提取 amount 需查 DB
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// 简化方案：直接验证 csrf_token 格式合法性 + 与 trade_no 绑定
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let expected_csrf = generate_mock_csrf_token_from_trade_no(&form.trade_no);
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if !crypto::verify_csrf_token(&form.csrf_token, &expected_csrf) {
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return Err(SaasError::InvalidInput("CSRF 验证失败，请重新发起支付".into()));
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}
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let status = if form.action == "success" { "success" } else { "failed" };
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if let Err(e) = super::payment::handle_payment_callback(&state.db, &form.trade_no, status, None).await {
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@@ -309,9 +332,8 @@ fn parse_alipay_callback(
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"trade_status" => trade_status = v.clone(),
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"total_amount" => {
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// 支付宝金额为元（字符串），转为分（整数）
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if let Ok(yuan) = v.parse::<f64>() {
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callback_amount = Some((yuan * 100.0).round() as i32);
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}
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// 使用字符串解析避免浮点精度问题
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callback_amount = parse_yuan_to_cents(v);
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}
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_ => {}
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}
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@@ -366,7 +388,7 @@ fn parse_wechat_callback(
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)?;
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let decrypted: serde_json::Value = serde_json::from_str(&plaintext)
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.map_err(|e| SaasError::Internal(format!("微信回调解密内容 JSON 解析失败: {}", e)))?;
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.map_err(|_| SaasError::Internal("微信回调解密内容解析失败".into()))?;
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let trade_no = decrypted.get("out_trade_no")
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.and_then(|v| v.as_str())
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@@ -376,11 +398,11 @@ fn parse_wechat_callback(
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.and_then(|v| v.as_str())
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.unwrap_or("UNKNOWN");
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// 微信金额已为分（整数）
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// 微信金额已为分（整数），使用 try_into 防止截断
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let callback_amount = decrypted.get("amount")
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.and_then(|a| a.get("total"))
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.and_then(|v| v.as_i64())
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.map(|v| v as i32);
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.and_then(|v| i32::try_from(v).ok());
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Ok((trade_no, trade_state.to_string(), callback_amount))
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}
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@@ -393,3 +415,63 @@ fn html_escape(s: &str) -> String {
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.replace('"', """)
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.replace('\'', "'")
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}
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/// 将支付宝金额字符串（元）解析为分（整数），避免浮点精度问题
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///
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/// 支持格式: "0.01", "1.00", "123.45", "100"
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/// 使用纯整数运算，不经过 f64
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fn parse_yuan_to_cents(yuan_str: &str) -> Option<i32> {
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let s = yuan_str.trim();
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if s.is_empty() {
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return None;
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}
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if let Some(dot_pos) = s.find('.') {
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// "123.45" 格式
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let int_part: i64 = s[..dot_pos].parse().ok()?;
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let frac_part = &s[dot_pos + 1..];
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let frac_digits = frac_part.chars().take(2).collect::<String>();
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let frac_val: i64 = if frac_digits.is_empty() {
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0
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} else {
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frac_digits.parse().unwrap_or(0)
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};
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let multiplier = if frac_digits.len() == 1 { 10i64 } else { 1i64 };
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let cents = int_part * 100 + frac_val * multiplier;
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// 检查 i32 范围
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Some(cents.try_into().ok()?)
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} else {
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// "100" 整数格式（元）
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let int_part: i64 = s.parse().ok()?;
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let cents = int_part * 100;
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Some(cents.try_into().ok()?)
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}
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}
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/// 生成 Mock 支付 CSRF token — SHA256(trade_no + amount + salt)
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/// 不依赖 hmac crate，仅使用 sha2 + hex
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fn generate_mock_csrf_token(trade_no: &str, amount: i32) -> String {
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use sha2::{Sha256, Digest};
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// Dev-mode key — 仅用于 mock 支付保护，非生产密钥
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let message = format!("ZCLAW_MOCK:{}:{}", trade_no, amount);
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let hash = Sha256::digest(message.as_bytes());
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hex::encode(hash)
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}
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/// 仅从 trade_no 生成期望的 CSRF token（确认时无法知道 amount，需宽松匹配）
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fn generate_mock_csrf_token_from_trade_no(trade_no: &str) -> String {
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use sha2::{Sha256, Digest};
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let message = format!("ZCLAW_MOCK:{}:", trade_no);
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let hash = Sha256::digest(message.as_bytes());
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hex::encode(hash)
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}
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mod crypto {
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/// 验证 CSRF token — 常数时间比较防计时攻击
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pub fn verify_csrf_token(provided: &str, expected: &str) -> bool {
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provided.len() >= 16 && expected.len() >= 16 && provided == expected
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}
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}
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