Harden plugin runtime: TLS verify, LSP deadlock, path traversal, ABI exception safety (W14)

W14 addresses the five most critical findings from the W13 plugin audits:

- W14.1 network: enable ssl::verify_peer + SSL_set1_host SNI hostname
  verification (fixes TLS bypass, W13.3 CVSS 7.4); add steady_timer DNS
  timeout and bottom-up catch(...) hardening (engineer-zhou)
- W14.2 lsp: fix reader_loop/stop mutex deadlock via stop_nolock/stop_locked
  split (W13.4); wrap 11 vtable/entry functions in try/catch with cv
  notification on reader exit (engineer-sun)
- W14.3 tools: add is_safe_path() rejecting empty/absolute/.. paths before
  file_io calls (fixes path traversal, W13.5 CVSS 7.5); guard g_tools and
  g_session/g_history under mutex; 9 vtable try/catch (security-cao)
- W14.4 host: add fallback plugin search (../plugins/) so binaries run from
  build/tests/ load current DLLs, resolving the W13.6 R2 stale-DLL false
  alarm (architect-lin)
- W14.5 anthropic+deepseek: wrap 12 ABI boundary functions in try/catch with
  log-guard, preventing exceptions from crossing the C ABI (engineer-chen)

Verified: cmake build 0 error 0 warning, ctest 4/4 pass, smoke R2 now
passes naturally.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

plugins/deepseek/src/deepseek_plugin.cpp

@@ -239,20 +239,28 @@ static int my_configure(const char* provider, const char* base_url,
                         const char* api_key, const char* model,
                         int max_tokens, double temperature)
 {
-    if (provider)  g_cfg.provider  = provider;
-    if (base_url)  g_cfg.base_url  = base_url;
-    if (api_key)   g_cfg.api_key   = api_key;
-    if (model)     g_cfg.model     = model;
-    g_cfg.max_tokens = max_tokens;
-    g_cfg.temperature = temperature;
+    try {
+        if (provider)  g_cfg.provider  = provider;
+        if (base_url)  g_cfg.base_url  = base_url;
+        if (api_key)   g_cfg.api_key   = api_key;
+        if (model)     g_cfg.model     = model;
+        g_cfg.max_tokens = max_tokens;
+        g_cfg.temperature = temperature;
 
-    if (g_host) {
-        g_host->log(DSTALK_LOG_INFO,
-            "[deepseek] configured: model=%s base_url=%s max_tokens=%d temperature=%.2f",
-            g_cfg.model.c_str(), g_cfg.base_url.c_str(),
-            g_cfg.max_tokens, g_cfg.temperature);
+        if (g_host) {
+            g_host->log(DSTALK_LOG_INFO,
+                "[deepseek] configured: model=%s base_url=%s max_tokens=%d temperature=%.2f",
+                g_cfg.model.c_str(), g_cfg.base_url.c_str(),
+                g_cfg.max_tokens, g_cfg.temperature);
+        }
+        return 0;
+    } catch (const std::exception& e) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] my_configure exception: %s", e.what());
+        return -1;
+    } catch (...) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] my_configure unknown exception");
+        return -1;
     }
-    return 0;
 }
 
 // ============================================================================
@@ -263,41 +271,55 @@ static dstalk_chat_result_t my_chat(
     const char* user_input,
     const char* tools_json)
 {
-    dstalk_chat_result_t r = {};
-    r.ok = 0;
+    try {
+        dstalk_chat_result_t r = {};
+        r.ok = 0;
 
-    if (!g_http) {
-        r.error = g_host->strdup("http service not available");
+        if (!g_http) {
+            r.error = g_host->strdup("http service not available");
+            return r;
+        }
+
+        std::string scheme, host, port, target;
+        extract_host_port(g_cfg.base_url, scheme, host, port, target);
+        std::string target_path = target + "/chat/completions";
+
+        std::string body = build_request_json(history, history_len,
+            user_input ? user_input : "", tools_json ? tools_json : "", false);
+
+        std::string headers_json = build_headers_json(g_cfg.api_key);
+
+        char* response_body = nullptr;
+        int status_code = 0;
+
+        int ret = g_http->post_json(
+            host.c_str(), port.c_str(), target_path.c_str(), body.c_str(),
+            headers_json.c_str(), &response_body, &status_code);
+
+        if (ret != 0) {
+            r.error = g_host->strdup("http request failed");
+            return r;
+        }
+
+        parse_response(response_body, status_code, r);
+
+        if (response_body) {
+            g_host->free(response_body);
+        }
+        return r;
+    } catch (const std::exception& e) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] my_chat exception: %s", e.what());
+        dstalk_chat_result_t r = {};
+        r.ok = 0;
+        r.error = g_host ? g_host->strdup(e.what()) : nullptr;
+        return r;
+    } catch (...) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] my_chat unknown exception");
+        dstalk_chat_result_t r = {};
+        r.ok = 0;
+        r.error = g_host ? g_host->strdup("unknown exception") : nullptr;
         return r;
     }
-
-    std::string scheme, host, port, target;
-    extract_host_port(g_cfg.base_url, scheme, host, port, target);
-    std::string target_path = target + "/chat/completions";
-
-    std::string body = build_request_json(history, history_len,
-        user_input ? user_input : "", tools_json ? tools_json : "", false);
-
-    std::string headers_json = build_headers_json(g_cfg.api_key);
-
-    char* response_body = nullptr;
-    int status_code = 0;
-
-    int ret = g_http->post_json(
-        host.c_str(), port.c_str(), target_path.c_str(), body.c_str(),
-        headers_json.c_str(), &response_body, &status_code);
-
-    if (ret != 0) {
-        r.error = g_host->strdup("http request failed");
-        return r;
-    }
-
-    parse_response(response_body, status_code, r);
-
-    if (response_body) {
-        g_host->free(response_body);
-    }
-    return r;
 }
 
 // ============================================================================
@@ -316,22 +338,30 @@ struct StreamContext {
 // 行回调：解析 SSE line，将 token 传递给用户回调
 static int sse_line_callback(const char* line, void* userdata)
 {
-    auto* ctx = static_cast<StreamContext*>(userdata);
-    if (!line || !line[0]) return 1; // 空行，继续
+    try {
+        auto* ctx = static_cast<StreamContext*>(userdata);
+        if (!line || !line[0]) return 1; // 空行，继续
 
-    std::string line_str(line);
-    std::string token;
+        std::string line_str(line);
+        std::string token;
 
-    if (!parse_sse_line(line_str, token)) return 1; // 非 data 行，继续
+        if (!parse_sse_line(line_str, token)) return 1; // 非 data 行，继续
 
-    if (token.empty()) return 0; // [DONE]，停止
+        if (token.empty()) return 0; // [DONE]，停止
 
-    ctx->accumulated += token;
+        ctx->accumulated += token;
 
-    if (ctx->user_cb) {
-        return ctx->user_cb(token.c_str(), ctx->userdata);
+        if (ctx->user_cb) {
+            return ctx->user_cb(token.c_str(), ctx->userdata);
+        }
+        return 1; // 继续
+    } catch (const std::exception& e) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] sse_line_callback exception: %s", e.what());
+        return 0;
+    } catch (...) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] sse_line_callback unknown exception");
+        return 0;
     }
-    return 1; // 继续
 }
 
 static dstalk_chat_result_t my_chat_stream(
@@ -339,81 +369,95 @@ static dstalk_chat_result_t my_chat_stream(
     const char* user_input,
     dstalk_stream_cb cb, void* userdata)
 {
-    dstalk_chat_result_t r = {};
-    r.ok = 0;
-
-    if (!g_http) {
-        r.error = g_host->strdup("http service not available");
-        return r;
-    }
-
-    std::string scheme, host, port, target;
-    extract_host_port(g_cfg.base_url, scheme, host, port, target);
-    std::string target_path = target + "/chat/completions";
-
-    std::string body = build_request_json(history, history_len,
-        user_input ? user_input : "", "", true);  // stream=true, no tools
-
-    std::string headers_json = build_headers_json(g_cfg.api_key);
-
-    StreamContext ctx;
-    ctx.host = g_host;
-    ctx.user_cb = cb;
-    ctx.userdata = userdata;
-
-    char* response_body = nullptr;
-    int status_code = 0;
-
-    int ret = g_http->post_stream(
-        host.c_str(), port.c_str(), target_path.c_str(), body.c_str(),
-        headers_json.c_str(),
-        sse_line_callback, &ctx,
-        &response_body, &status_code);
-
-    r.http_status = status_code;
-
-    // 检查传输层错误或非 2xx 状态
-    if (status_code < 200 || status_code >= 300) {
+    try {
+        dstalk_chat_result_t r = {};
         r.ok = 0;
-        // 尝试从响应体提取错误信息
-        if (response_body && response_body[0]) {
-            try {
-                auto jv = json::parse(response_body);
-                auto obj = jv.as_object();
-                if (obj.contains("error")) {
-                    auto err = obj["error"].as_object();
+
+        if (!g_http) {
+            r.error = g_host->strdup("http service not available");
+            return r;
+        }
+
+        std::string scheme, host, port, target;
+        extract_host_port(g_cfg.base_url, scheme, host, port, target);
+        std::string target_path = target + "/chat/completions";
+
+        std::string body = build_request_json(history, history_len,
+            user_input ? user_input : "", "", true);  // stream=true, no tools
+
+        std::string headers_json = build_headers_json(g_cfg.api_key);
+
+        StreamContext ctx;
+        ctx.host = g_host;
+        ctx.user_cb = cb;
+        ctx.userdata = userdata;
+
+        char* response_body = nullptr;
+        int status_code = 0;
+
+        int ret = g_http->post_stream(
+            host.c_str(), port.c_str(), target_path.c_str(), body.c_str(),
+            headers_json.c_str(),
+            sse_line_callback, &ctx,
+            &response_body, &status_code);
+
+        r.http_status = status_code;
+
+        // 检查传输层错误或非 2xx 状态
+        if (status_code < 200 || status_code >= 300) {
+            r.ok = 0;
+            // 尝试从响应体提取错误信息
+            if (response_body && response_body[0]) {
+                try {
+                    auto jv = json::parse(response_body);
+                    auto obj = jv.as_object();
+                    if (obj.contains("error")) {
+                        auto err = obj["error"].as_object();
+                        r.error = g_host->strdup(
+                            json::value_to<std::string>(err["message"]).c_str());
+                    }
+                } catch (...) {}
+            }
+            if (!r.error) {
+                if (status_code <= 0)
+                    r.error = g_host->strdup("transport error");
+                else
                     r.error = g_host->strdup(
-                        json::value_to<std::string>(err["message"]).c_str());
-                }
-            } catch (...) {}
-        }
-        if (!r.error) {
-            if (status_code <= 0)
-                r.error = g_host->strdup("transport error");
-            else
-                r.error = g_host->strdup(
-                    ("HTTP " + std::to_string(status_code)).c_str());
+                        ("HTTP " + std::to_string(status_code)).c_str());
+            }
+            if (response_body) g_host->free(response_body);
+            r.content = nullptr;
+            r.tool_calls_json = nullptr;
+            return r;
         }
+
         if (response_body) g_host->free(response_body);
-        r.content = nullptr;
-        r.tool_calls_json = nullptr;
+
+        if (ctx.accumulated.empty()) {
+            r.ok = 0;
+            r.error = g_host->strdup("no content received");
+            r.content = nullptr;
+            r.tool_calls_json = nullptr;
+        } else {
+            r.ok = 1;
+            r.error = nullptr;
+            r.content = g_host->strdup(ctx.accumulated.c_str());
+            r.tool_calls_json = nullptr;
+        }
+        return r;
+    } catch (const std::exception& e) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] my_chat_stream exception: %s", e.what());
+        dstalk_chat_result_t r = {};
+        r.ok = 0;
+        r.error = g_host ? g_host->strdup(e.what()) : nullptr;
+        return r;
+    } catch (...) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] my_chat_stream unknown exception");
+        dstalk_chat_result_t r = {};
+        r.ok = 0;
+        r.error = g_host ? g_host->strdup("unknown exception") : nullptr;
         return r;
     }
-
-    if (response_body) g_host->free(response_body);
-
-    if (ctx.accumulated.empty()) {
-        r.ok = 0;
-        r.error = g_host->strdup("no content received");
-        r.content = nullptr;
-        r.tool_calls_json = nullptr;
-    } else {
-        r.ok = 1;
-        r.error = nullptr;
-        r.content = g_host->strdup(ctx.accumulated.c_str());
-        r.tool_calls_json = nullptr;
-    }
-    return r;
 }
 
 // ============================================================================
@@ -442,28 +486,42 @@ static dstalk_ai_service_t g_service = {
 // ============================================================================
 static int on_init(const dstalk_host_api_t* host)
 {
-    g_host = host;
-    g_http = (dstalk_http_service_t*)host->query_service("http", 1);
-    g_config = (dstalk_config_service_t*)host->query_service("config", 1);
+    try {
+        g_host = host;
+        g_http = (dstalk_http_service_t*)host->query_service("http", 1);
+        g_config = (dstalk_config_service_t*)host->query_service("config", 1);
 
-    if (!g_http) {
-        if (g_host) g_host->log(DSTALK_LOG_ERROR, "[deepseek] http service not found");
+        if (!g_http) {
+            if (g_host) g_host->log(DSTALK_LOG_ERROR, "[deepseek] http service not found");
+            return -1;
+        }
+
+        if (g_host) g_host->log(DSTALK_LOG_INFO, "[deepseek] initializing DeepSeek AI plugin");
+
+        return host->register_service("ai.deepseek", 1, &g_service);
+    } catch (const std::exception& e) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] on_init exception: %s", e.what());
+        return -1;
+    } catch (...) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] on_init unknown exception");
         return -1;
     }
-
-    if (g_host) g_host->log(DSTALK_LOG_INFO, "[deepseek] initializing DeepSeek AI plugin");
-
-    return host->register_service("ai.deepseek", 1, &g_service);
 }
 
 static void on_shutdown()
 {
-    if (g_host) g_host->log(DSTALK_LOG_INFO, "[deepseek] shutdown");
-    secure_zero(g_cfg.api_key.data(), g_cfg.api_key.size());
-    g_cfg.api_key.clear();
-    g_http = nullptr;
-    g_config = nullptr;
-    g_host = nullptr;
+    try {
+        if (g_host) g_host->log(DSTALK_LOG_INFO, "[deepseek] shutdown");
+        secure_zero(g_cfg.api_key.data(), g_cfg.api_key.size());
+        g_cfg.api_key.clear();
+        g_http = nullptr;
+        g_config = nullptr;
+        g_host = nullptr;
+    } catch (const std::exception& e) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] on_shutdown exception: %s", e.what());
+    } catch (...) {
+        if (g_host && g_host->log) g_host->log(DSTALK_LOG_ERROR, "[deepseek] on_shutdown unknown exception");
+    }
 }
 
 // ============================================================================