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heidi-dang
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Jan 27, 2026
heidi-dang
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- add a root-safe, non-interactive deploy.sh\n- wire deploy workflow to run deploy.sh via SSH\n- preserve .env during deploy
Summary of ChangesHello @heidi-dang, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request introduces a robust, single-script solution for deploying the AutoCoder application to a Virtual Private Server. It streamlines the entire deployment process by automating the setup of Docker, configuring dynamic DNS with DuckDNS, integrating Traefik for reverse proxying and SSL termination via Let's Encrypt, and managing the application's Docker Compose stack. The script is designed to be flexible, supporting both interactive execution for manual deployments and non-interactive, environment-variable-driven execution for CI/CD pipelines, while also ensuring critical configuration files like Highlights
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Code Review
This pull request introduces deploy.sh, a script designed to automate VPS setup, handling dependencies, configuration, and application deployment. However, a critical command injection vulnerability via cron job manipulation and insecure data handling (sensitive credentials stored in a world-readable file) have been identified. Additionally, the script suppresses potential failures in critical network requests, which could lead to hard-to-diagnose deployment issues. Addressing these security and reliability concerns is crucial.
| cat > "${cron_file}" <<EOF | ||
| */5 * * * * root curl -fsS "https://www.duckdns.org/update?domains=${DUCKDNS_SUBDOMAIN}&token=${DUCKDNS_TOKEN}&ip=" >/var/log/duckdns.log 2>&1 | ||
| EOF |
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The script writes user-supplied input (DUCKDNS_SUBDOMAIN and DUCKDNS_TOKEN) directly into a cron file in /etc/cron.d/. If these variables contain newlines, an attacker can inject arbitrary cron jobs that will be executed as root. This is a critical command injection vulnerability, especially if the script is used in automated environments where inputs might be controlled by untrusted parties.
| cat > "${cron_file}" <<EOF | |
| */5 * * * * root curl -fsS "https://www.duckdns.org/update?domains=${DUCKDNS_SUBDOMAIN}&token=${DUCKDNS_TOKEN}&ip=" >/var/log/duckdns.log 2>&1 | |
| EOF | |
| cat > "${cron_file}" <<EOF | |
| */5 * * * * root curl -fsS "https://www.duckdns.org/update?domains=${DUCKDNS_SUBDOMAIN//[^a-zA-Z0-9.-]/}&token=${DUCKDNS_TOKEN//[^a-zA-Z0-9-]/}&ip=" >/var/log/duckdns.log 2>&1 | |
| EOF |
| cat > "${cron_file}" <<EOF | ||
| */5 * * * * root curl -fsS "https://www.duckdns.org/update?domains=${DUCKDNS_SUBDOMAIN}&token=${DUCKDNS_TOKEN}&ip=" >/var/log/duckdns.log 2>&1 | ||
| EOF | ||
| chmod 644 "${cron_file}" |
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The DUCKDNS_TOKEN is stored in /etc/cron.d/duckdns with world-readable permissions (644), posing a security risk as any user can access this sensitive credential. Permissions should be restricted to 600 to ensure only the root user can access it.
| chmod 644 "${cron_file}" | |
| chmod 600 "${cron_file}" |
| curl -fsS "https://www.duckdns.org/update?domains=${DUCKDNS_SUBDOMAIN}&token=${DUCKDNS_TOKEN}&ip=" \ | ||
| >/var/log/duckdns.log 2>&1 || true |
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The script currently suppresses errors from the initial DuckDNS update using || true. If this critical step fails (e.g., due to an invalid token), the script continues, which will likely cause the SSL certificate issuance to fail later in a non-obvious way. It's better to check the API response from DuckDNS and provide a clear warning or exit on failure, especially in automated runs.
| curl -fsS "https://www.duckdns.org/update?domains=${DUCKDNS_SUBDOMAIN}&token=${DUCKDNS_TOKEN}&ip=" \ | |
| >/var/log/duckdns.log 2>&1 || true | |
| local response | |
| response=$(curl -fsS "https://www.duckdns.org/update?domains=${DUCKDNS_SUBDOMAIN}&token=${DUCKDNS_TOKEN}&ip=" || echo "curl_error") | |
| echo "${response}" >/var/log/duckdns.log 2>&1 | |
| if [[ "${response}" != "OK" ]]; then | |
| echo "WARNING: Initial DuckDNS update failed. Response: '${response}'. SSL certificate issuance may fail." >&2 | |
| if [[ "${AUTOMATED_MODE}" -eq 1 ]]; then | |
| echo "ERROR: Aborting due to DuckDNS update failure in automated mode." >&2 | |
| exit 1 | |
| fi | |
| fi |
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