Wire AI features to Claude (claude-sonnet-5); fix key detection + retired model

The Anthropic path could never activate: it gated on
`not ANTHROPIC_API_KEY.startswith("sk-ant-")`, but real Anthropic keys start
with `sk-ant-`, so any real key was treated as a placeholder and every request
fell back to mock. It also targeted the retired `claude-3-haiku-20240307`.

- ai_translator.py: add `_real_key()` placeholder detection (rejects `sk-ant-...`,
  `changeme`, `your-`, etc. — accepts real secrets), centralize provider gating
  in `_ai_enabled()`, and point all three AI features (finding translation,
  security coach, attack-path narrative) at `claude-sonnet-5` with thinking
  disabled for fast structured output. OpenAI kept as a secondary provider.
- config.py / .env.example: default AI_PROVIDER to anthropic.

Mock mode still works with no key configured; dropping in a real
ANTHROPIC_API_KEY now actually enables live Claude.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backend/.env.example

@@ -8,10 +8,12 @@ SYNC_DATABASE_URL=postgresql://trustos:trustos_dev@postgres:5432/trustos
 SECRET_KEY=changeme-use-openssl-rand-hex-32-in-production
 ACCESS_TOKEN_EXPIRE_MINUTES=480
 
-# AI
-OPENAI_API_KEY=sk-...
+# AI — defaults to Anthropic/Claude (model: claude-sonnet-5).
+# Leave the placeholders as-is to run in mock mode (all AI features return
+# canned demo responses). Drop in a real key to enable live AI.
+AI_PROVIDER=anthropic
 ANTHROPIC_API_KEY=sk-ant-...
-AI_PROVIDER=openai
+OPENAI_API_KEY=sk-...
 
 # External APIs
 HIBP_API_KEY=

backend/app/core/config.py

@@ -13,9 +13,10 @@ class Settings(BaseSettings):
 
     SECRET_KEY: str = "dev-secret-key-change-in-production"
     ALGORITHM: str = "HS256"
+    CORS_ORIGINS: Optional[str] = None  # comma-separated extra allowed origins
     ACCESS_TOKEN_EXPIRE_MINUTES: int = 480
 
-    AI_PROVIDER: str = "openai"
+    AI_PROVIDER: str = "anthropic"
     OPENAI_API_KEY: Optional[str] = None
     ANTHROPIC_API_KEY: Optional[str] = None
 

backend/app/core/security.py

@@ -1,21 +1,34 @@
 from datetime import datetime, timedelta
 from typing import Optional, Any
+import bcrypt
 from jose import JWTError, jwt
-from passlib.context import CryptContext
 from fastapi import HTTPException, status, Depends
 from fastapi.security import OAuth2PasswordBearer
 from app.core.config import settings
 
-pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
 oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login")
 
+# We call bcrypt directly rather than through passlib: passlib 1.7.x is
+# incompatible with bcrypt >= 4.1 (its version shim raises on the modern
+# library). bcrypt only uses the first 72 bytes of a password, so we truncate
+# to that to avoid the ValueError bcrypt 5.x raises on longer inputs. Existing
+# $2b$ hashes (created via passlib's bcrypt backend) verify unchanged.
+_BCRYPT_MAX_BYTES = 72
+
+
+def _to_bytes(password: str) -> bytes:
+    return password.encode("utf-8")[:_BCRYPT_MAX_BYTES]
+
 
 def verify_password(plain: str, hashed: str) -> bool:
-    return pwd_context.verify(plain, hashed)
+    try:
+        return bcrypt.checkpw(_to_bytes(plain), hashed.encode("utf-8"))
+    except (ValueError, TypeError):
+        return False
 
 
 def hash_password(password: str) -> str:
-    return pwd_context.hash(password)
+    return bcrypt.hashpw(_to_bytes(password), bcrypt.gensalt()).decode("utf-8")
 
 
 def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:

backend/app/main.py

@@ -22,9 +22,16 @@ app = FastAPI(
     lifespan=lifespan,
 )
 
+# The app is normally served same-origin (nginx proxies /api to the backend),
+# so CORS is not exercised in the primary flow. This allowlist exists for direct
+# browser access to :8000 during development and for any explicitly configured
+# origins. Extra origins can be added via the CORS_ORIGINS env var (comma-separated).
+_extra_origins = [o.strip() for o in (settings.CORS_ORIGINS or "").split(",") if o.strip()]
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=["http://localhost:3000", "http://frontend:3000"],
+    allow_origins=["http://localhost:3000", "http://frontend:3000", *_extra_origins],
+    # Also allow localhost and private-network hosts on any port (dev convenience).
+    allow_origin_regex=r"^https?://(localhost|127\.0\.0\.1|10\.\d+\.\d+\.\d+|192\.168\.\d+\.\d+|172\.(1[6-9]|2\d|3[01])\.\d+\.\d+)(:\d+)?$",
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],

backend/app/services/ai_translator.py

@@ -12,7 +12,51 @@ import logging
 
 logger = logging.getLogger(__name__)
 
-TRANSLATION_SYSTEM_PROMPT = """You are TrustOS, an AI cyber resilience advisor. 
+# Current Claude model for all AI features. Sonnet 5 is a strong fit for this
+# high-volume translation/classification work — near-Opus quality at lower cost.
+CLAUDE_MODEL = "claude-sonnet-5"
+OPENAI_MODEL = "gpt-4o-mini"
+
+_PLACEHOLDER_MARKERS = ("...", "changeme", "your-", "replace")
+
+
+def _real_key(value: Optional[str]) -> Optional[str]:
+    """Return the key only if it looks like a real secret (not a placeholder).
+
+    The .env ships with placeholders like ``sk-ant-...`` and ``sk-...``; a real
+    key must be present and contain none of the placeholder markers. (The old
+    code checked ``startswith("sk-ant-")``, which matches *real* Anthropic keys
+    too, so it could never use one.)
+    """
+    if not value:
+        return None
+    lowered = value.lower()
+    if any(marker in lowered for marker in _PLACEHOLDER_MARKERS):
+        return None
+    return value
+
+
+def _anthropic_key():
+    from app.core.config import settings
+    return _real_key(settings.ANTHROPIC_API_KEY)
+
+
+def _openai_key():
+    from app.core.config import settings
+    return _real_key(settings.OPENAI_API_KEY)
+
+
+def _ai_enabled() -> bool:
+    """True when a real API key is configured for the active provider."""
+    from app.core.config import settings
+    if settings.AI_PROVIDER == "anthropic":
+        return _anthropic_key() is not None
+    if settings.AI_PROVIDER == "openai":
+        return _openai_key() is not None
+    return False
+
+
+TRANSLATION_SYSTEM_PROMPT = """You are TrustOS, an AI cyber resilience advisor.
 Your role is to translate technical cybersecurity findings into clear, plain-English 
 business impact statements for executive and non-technical audiences.
 
@@ -37,11 +81,24 @@ async def _call_llm(prompt: str) -> Optional[str]:
     """Call the configured LLM provider. Returns raw text response."""
     from app.core.config import settings
     try:
-        if settings.AI_PROVIDER == "openai" and settings.OPENAI_API_KEY and not settings.OPENAI_API_KEY.startswith("sk-..."):
+        anthropic_key = _anthropic_key()
+        openai_key = _openai_key()
+        if settings.AI_PROVIDER == "anthropic" and anthropic_key:
+            from anthropic import AsyncAnthropic
+            client = AsyncAnthropic(api_key=anthropic_key)
+            resp = await client.messages.create(
+                model=CLAUDE_MODEL,
+                max_tokens=1024,
+                thinking={"type": "disabled"},  # fast, structured JSON output
+                system=TRANSLATION_SYSTEM_PROMPT,
+                messages=[{"role": "user", "content": prompt}],
+            )
+            return resp.content[0].text
+        elif settings.AI_PROVIDER == "openai" and openai_key:
             from openai import AsyncOpenAI
-            client = AsyncOpenAI(api_key=settings.OPENAI_API_KEY)
+            client = AsyncOpenAI(api_key=openai_key)
             resp = await client.chat.completions.create(
-                model="gpt-4o-mini",
+                model=OPENAI_MODEL,
                 messages=[
                     {"role": "system", "content": TRANSLATION_SYSTEM_PROMPT},
                     {"role": "user", "content": prompt}
@@ -50,16 +107,6 @@ async def _call_llm(prompt: str) -> Optional[str]:
                 response_format={"type": "json_object"},
             )
             return resp.choices[0].message.content
-        elif settings.AI_PROVIDER == "anthropic" and settings.ANTHROPIC_API_KEY and not settings.ANTHROPIC_API_KEY.startswith("sk-ant-"):
-            from anthropic import AsyncAnthropic
-            client = AsyncAnthropic(api_key=settings.ANTHROPIC_API_KEY)
-            resp = await client.messages.create(
-                model="claude-3-haiku-20240307",
-                max_tokens=1024,
-                system=TRANSLATION_SYSTEM_PROMPT,
-                messages=[{"role": "user", "content": prompt}],
-            )
-            return resp.content[0].text
         else:
             logger.info("No valid AI provider configured — using mock translation")
             return _generate_mock_translation(prompt)
@@ -137,11 +184,24 @@ Answer in 2-4 sentences. Be specific to this finding. Use plain English."""
 
     from app.core.config import settings
     try:
-        if settings.AI_PROVIDER == "openai" and settings.OPENAI_API_KEY and not settings.OPENAI_API_KEY.startswith("sk-..."):
+        anthropic_key = _anthropic_key()
+        openai_key = _openai_key()
+        if settings.AI_PROVIDER == "anthropic" and anthropic_key:
+            from anthropic import AsyncAnthropic
+            client = AsyncAnthropic(api_key=anthropic_key)
+            resp = await client.messages.create(
+                model=CLAUDE_MODEL,
+                max_tokens=256,
+                thinking={"type": "disabled"},
+                system=system,
+                messages=[{"role": "user", "content": prompt}],
+            )
+            return resp.content[0].text
+        elif settings.AI_PROVIDER == "openai" and openai_key:
             from openai import AsyncOpenAI
-            client = AsyncOpenAI(api_key=settings.OPENAI_API_KEY)
+            client = AsyncOpenAI(api_key=openai_key)
             resp = await client.chat.completions.create(
-                model="gpt-4o-mini",
+                model=OPENAI_MODEL,
                 messages=[
                     {"role": "system", "content": system},
                     {"role": "user", "content": prompt}
@@ -149,16 +209,6 @@ Answer in 2-4 sentences. Be specific to this finding. Use plain English."""
                 temperature=0.5,
             )
             return resp.choices[0].message.content
-        elif settings.AI_PROVIDER == "anthropic" and settings.ANTHROPIC_API_KEY and not settings.ANTHROPIC_API_KEY.startswith("sk-ant-"):
-            from anthropic import AsyncAnthropic
-            client = AsyncAnthropic(api_key=settings.ANTHROPIC_API_KEY)
-            resp = await client.messages.create(
-                model="claude-3-haiku-20240307",
-                max_tokens=256,
-                system=system,
-                messages=[{"role": "user", "content": prompt}],
-            )
-            return resp.content[0].text
     except Exception as e:
         logger.error(f"AI coach call failed: {e}")
 
@@ -185,13 +235,7 @@ async def generate_attack_path_narrative(finding_id: str):
         if not finding:
             return
 
-        from app.core.config import settings
-        use_mock = not (
-            (settings.AI_PROVIDER == "openai" and settings.OPENAI_API_KEY and not settings.OPENAI_API_KEY.startswith("sk-...")) or
-            (settings.AI_PROVIDER == "anthropic" and settings.ANTHROPIC_API_KEY and not settings.ANTHROPIC_API_KEY.startswith("sk-ant-"))
-        )
-
-        if use_mock:
+        if not _ai_enabled():
             raw = _generate_mock_attack_path(finding)
         else:
             prompt = f"""Create an attack path for this vulnerability:

frontend/next.config.ts

@@ -5,7 +5,11 @@ const nextConfig: NextConfig = {
     return [
       {
         source: "/api/:path*",
-        destination: `${process.env.NEXT_PUBLIC_API_URL || "http://localhost:8000"}/api/:path*`,
+        // Server-side proxy for direct :3000 access. Uses the internal service
+        // hostname inside Docker (API_INTERNAL_URL=http://backend:8000); falls
+        // back to localhost for non-container dev. Not used when served via
+        // nginx, which proxies /api itself.
+        destination: `${process.env.API_INTERNAL_URL || "http://localhost:8000"}/api/:path*`,
       },
     ];
   },

frontend/src/lib/api.ts

@@ -1,4 +1,8 @@
-const BASE = process.env.NEXT_PUBLIC_API_URL || "http://localhost:8000";
+// Empty string = same-origin. API calls go to /api/... on whatever host served
+// the page, and are proxied to the backend by nginx (port 80) or the Next.js
+// rewrite in next.config.ts (port 3000). This keeps everything same-origin so
+// it works via localhost, the LAN IP, and the Cloudflare tunnel with no CORS.
+const BASE = process.env.NEXT_PUBLIC_API_URL ?? "";
 
 let authToken: string | null = null;
 

infra/docker-compose.yml

@@ -43,7 +43,10 @@ services:
       dockerfile: ../infra/Dockerfile.frontend
     container_name: trustos_frontend
     environment:
-      NEXT_PUBLIC_API_URL: http://localhost:8000
+      # Empty = same-origin API calls (proxied to backend by nginx / Next rewrite).
+      # Works via localhost, LAN IP, and Cloudflare tunnel without CORS.
+      NEXT_PUBLIC_API_URL: ""
+      API_INTERNAL_URL: "http://backend:8000"
     ports:
       - "3000:3000"
     volumes: