Fix SSL certificate generation for HTTPS mode

- wizard/setup now generate certs when HTTPS enabled
- app.py has proper error handling for cert failures
- Add custom SSL certificate documentation to INSTALL.md
- Include SANs for hostname, localhost, and local IP

Previously HTTPS could be enabled but certs weren't generated,
causing SSL_ERROR_RX_RECORD_TOO_LONG browser errors.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

INSTALL.md

@@ -553,6 +553,85 @@ print(f'jpegio: {has_jpegio_support()}')
 
 ---
 
+## Custom SSL Certificates
+
+By default, Stegasoo generates a self-signed certificate for HTTPS. To use your own certificate (e.g., from Let's Encrypt or your organization's CA):
+
+### Replace Self-Signed Certificates
+
+```bash
+# Stop the service
+sudo systemctl stop stegasoo
+
+# Backup existing certs (optional)
+mv /opt/stegasoo/frontends/web/certs /opt/stegasoo/frontends/web/certs.bak
+
+# Create new certs directory
+mkdir -p /opt/stegasoo/frontends/web/certs
+
+# Copy your certificates (adjust paths as needed)
+cp /path/to/your/certificate.crt /opt/stegasoo/frontends/web/certs/server.crt
+cp /path/to/your/private.key /opt/stegasoo/frontends/web/certs/server.key
+
+# Set permissions (key must be readable by service user)
+chmod 600 /opt/stegasoo/frontends/web/certs/server.key
+chown -R $(whoami):$(whoami) /opt/stegasoo/frontends/web/certs
+
+# Start the service
+sudo systemctl start stegasoo
+```
+
+### Generate New Self-Signed Certificate
+
+If your certificate expires or you need to regenerate:
+
+```bash
+# Stop service
+sudo systemctl stop stegasoo
+
+# Generate new cert with SANs
+CERT_DIR="/opt/stegasoo/frontends/web/certs"
+LOCAL_IP=$(hostname -I | awk '{print $1}')
+HOSTNAME=$(hostname)
+
+openssl req -x509 -newkey rsa:2048 \
+  -keyout "$CERT_DIR/server.key" \
+  -out "$CERT_DIR/server.crt" \
+  -days 365 -nodes \
+  -subj "/O=Stegasoo/CN=$HOSTNAME" \
+  -addext "subjectAltName=DNS:$HOSTNAME,DNS:$HOSTNAME.local,DNS:localhost,IP:$LOCAL_IP,IP:127.0.0.1"
+
+chmod 600 "$CERT_DIR/server.key"
+
+# Start service
+sudo systemctl start stegasoo
+```
+
+### Let's Encrypt with Certbot
+
+For publicly accessible servers:
+
+```bash
+# Install certbot
+sudo apt install certbot
+
+# Get certificate (standalone mode)
+sudo certbot certonly --standalone -d yourdomain.com
+
+# Copy to Stegasoo
+sudo cp /etc/letsencrypt/live/yourdomain.com/fullchain.pem /opt/stegasoo/frontends/web/certs/server.crt
+sudo cp /etc/letsencrypt/live/yourdomain.com/privkey.pem /opt/stegasoo/frontends/web/certs/server.key
+sudo chown $(whoami):$(whoami) /opt/stegasoo/frontends/web/certs/*
+sudo chmod 600 /opt/stegasoo/frontends/web/certs/server.key
+
+# Restart
+sudo systemctl restart stegasoo
+```
+
+**Note:** Set up a cron job or systemd timer to copy renewed certificates and restart Stegasoo.
+
+---
+
 ## Verification
 
 ### Check Installation

frontends/web/app.py

@@ -2324,9 +2324,21 @@ if __name__ == "__main__":
     ssl_context = None
     if app.config.get("HTTPS_ENABLED", False):
         hostname = os.environ.get("STEGASOO_HOSTNAME", "localhost")
+        try:
             cert_path, key_path = ensure_certs(base_dir, hostname)
+            if cert_path.exists() and key_path.exists():
                 ssl_context = (str(cert_path), str(key_path))
                 print(f"HTTPS enabled with self-signed certificate for {hostname}")
+            else:
+                print("ERROR: SSL certificates not found after generation attempt")
+                print(f"  Expected: {cert_path}, {key_path}")
+                print("  Falling back to HTTP (INSECURE)")
+        except Exception as e:
+            print(f"ERROR: Failed to generate SSL certificates: {e}")
+            print("  Falling back to HTTP (INSECURE)")
+            print("  To fix: mkdir -p certs && openssl req -x509 -newkey rsa:2048 \\")
+            print("    -keyout certs/server.key -out certs/server.crt -days 365 -nodes \\")
+            print("    -subj '/CN=localhost'")
 
     # Auth status
     if app.config.get("AUTH_ENABLED", True):

rpi/first-boot-wizard.sh

@@ -279,6 +279,32 @@ EOF
 "
 gum style --foreground 82 "✓ Service configured"
 
+# Generate SSL certificates if HTTPS enabled
+if [ "$ENABLE_HTTPS" = "true" ]; then
+  gum spin --spinner dot --title "Generating SSL certificates..." -- bash -c "
+    CERT_DIR='$INSTALL_DIR/frontends/web/certs'
+    mkdir -p \"\$CERT_DIR\"
+
+    # Get local IP for SAN
+    LOCAL_IP=\$(hostname -I | awk '{print \$1}')
+    HOSTNAME=\$(hostname)
+
+    # Generate cert with SANs for IP, hostname, and localhost
+    openssl req -x509 -newkey rsa:2048 \
+      -keyout \"\$CERT_DIR/server.key\" \
+      -out \"\$CERT_DIR/server.crt\" \
+      -days 365 -nodes \
+      -subj \"/O=Stegasoo/CN=\$HOSTNAME\" \
+      -addext \"subjectAltName=DNS:\$HOSTNAME,DNS:\$HOSTNAME.local,DNS:localhost,IP:\$LOCAL_IP,IP:127.0.0.1\" \
+      2>/dev/null
+
+    # Fix permissions
+    chmod 600 \"\$CERT_DIR/server.key\"
+    chown -R $STEGASOO_USER:\$(id -gn $STEGASOO_USER) \"\$CERT_DIR\"
+  "
+  gum style --foreground 82 "✓ SSL certificates generated"
+fi
+
 # Setup port 443 if requested
 if [ "$USE_PORT_443" = "true" ]; then
   gum spin --spinner dot --title "Setting up port 443 redirect..." -- bash -c "

rpi/setup.sh

@@ -465,6 +465,31 @@ RestartSec=5
 WantedBy=multi-user.target
 EOF
 
+# Generate SSL certificates if HTTPS enabled
+if [ "$ENABLE_HTTPS" = "true" ]; then
+    echo "  Generating SSL certificates..."
+    CERT_DIR="$INSTALL_DIR/frontends/web/certs"
+    mkdir -p "$CERT_DIR"
+
+    # Get local IP for SAN
+    LOCAL_IP=$(hostname -I | awk '{print $1}')
+    PI_HOSTNAME=$(hostname)
+
+    # Generate cert with SANs for IP, hostname, and localhost
+    openssl req -x509 -newkey rsa:2048 \
+      -keyout "$CERT_DIR/server.key" \
+      -out "$CERT_DIR/server.crt" \
+      -days 365 -nodes \
+      -subj "/O=Stegasoo/CN=$PI_HOSTNAME" \
+      -addext "subjectAltName=DNS:$PI_HOSTNAME,DNS:$PI_HOSTNAME.local,DNS:localhost,IP:$LOCAL_IP,IP:127.0.0.1" \
+      2>/dev/null
+
+    # Fix permissions
+    chmod 600 "$CERT_DIR/server.key"
+    chown -R "$USER:$USER" "$CERT_DIR"
+    echo -e "  ${GREEN}✓${NC} SSL certificates generated"
+fi
+
 # Setup port 443 redirect if requested
 if [ "$USE_PORT_443" = "true" ]; then
     echo "  Setting up port 443 redirect..."