The Configuration That Almost Exposed a Secret: A Case Study in Infrastructure Security

Introduction

In the course of deploying a distributed storage cluster across three physical nodes, an assistant created a configuration file that contained a critical security flaw: a plaintext API token embedded directly in a settings file. This message — message index 1990 in the conversation — is outwardly mundane: a shell heredoc that writes environment variables into a file called settings-kuri2.env for the second storage node in a Filecoin Gateway (FGW) test cluster. But this message sits at a pivotal moment where infrastructure automation collides with security best practices, and the subsequent user correction reshaped the entire deployment approach.

The Message in Full

The assistant executed the following command via a remote shell:

cat > /tmp/settings-kuri2.env << 'EOF'
# Kuri settings for kuri_02
# QA Environment

# =============================================================================
# Node Identification
# =============================================================================
FGW_NODE_ID="kuri_02"
FGW_NODE_TYPE="storage"

# =============================================================================
# RIBS Data
# =============================================================================
RIBS_DATA="/data/fgw"
RIBS_MAX_LOCAL_GROUP_COUNT="30"
RIBS_MAX_STAGING_GROUP_COUNT="10"

# =============================================================================
# Filecoin API
# =============================================================================
RIBS_FILECOIN_API_ENDPOINT="https://api.chain.love/rpc/v1"

# =============================================================================
# CIDGravity
# =============================================================================
CIDGRAVITY_API_TOKEN="[REDACTED]"
CIDGRAVITY_API_ENDPOINT_GBAP="https://service.cidgravity.com/private/v1/get-best-available-providers"
CIDGRAVITY_API_ENDPOINT_GOCD="https://service.cidgravity.com/private/v1/get-on-chain-deals"
CIDGRAVITY_MAX_CONNECTIONS="4"

# =============================================================================
# Deal Settings
# =============================================================================
RIBS_MINIMUM_REPLICA_COUNT="3"
RIBS_MAXIMUM_REPLICA_COUNT="5"
RIBS_MINIMUM_RETRIEVABLE_COUNT="3"
RIBS_RETRIEVALBLE_REPAIR_THRESHOLD="2"
RIBS_DEAL_START_TIME="96"
RIBS_DEAL_DURATION="530"
RIBS_DEAL_REMOVE_UNSEALED="false"
RIBS_DEAL_SKIP_IPNI_ANNOUNCE="false"
RIBS_DEAL_CHECK_INTERVAL="30s"
RIBS_RUN_SP_CRAWLER="true"

# =============================================================================
# YugabyteDB - Per-node (RIBS data)
# =============================================================================
RIBS_YUGABYTE_SQL_HOST="10.1.232.82"
RIBS_YUGABYTE_SQL_PORT="5433"
RIBS_YUGABYTE_SQL_DB="filecoingw_kuri_02"
RIBS_YUGABYTE_SQL_USER="yugabyte"
RIBS_YUGABYTE_SQL_PASS="yugabyte"

RIBS_YUGABYTE_CQL_HOSTS="10.1.232.82"
RIBS_YUGABYTE_CQL_PORT="9042"
RIBS_YUGABYTE_CQL_KEYSPACE="filecoingw_kuri_02"

# =============================================================================
# S3 Shared Keyspace (object routing)
# =============================================================================
RIBS_S3_CQL_HOSTS="10.1.232.82"
RIBS_S3_CQL_PORT="9042"
RIBS_S3_CQL_KEYSPACE="filecoingw_s3"

# =============================================================================
# S3 API (internal)
# =============================================================================
RIBS_S3API_BINDADDR=":8079"
RIBS_S3API_REGION="EU"
RIBS_S3API_AUTH_ENABLED="false"

# =============================================================================
# LocalWeb (CAR file staging for storage providers)
# =============================================================================
EXTERNAL_LOCALWEB_PATH="/data/fgw/cardata"
EXTERNAL_LOCALWEB_URL="http://10.1.232.84:7011"
EXTERNAL_LOCALWEB_BUILTIN_SERVER="true"
EXTERNAL_LOCALWEB_SERVER_PORT="7011"
EXTERNAL_LOCALWEB_SERVER_TLS="false"
EXTERNAL_LOCALWEB_MAX_CONCURRENT_UPLOADS_PER_DEAL="15"

# =============================================================================
# Internal API
# =============================================================================
FGW_INTERNAL_API_BINDADDR=":9090"

# =============================================================================
# Prometheus Metrics
# =============================================================================
RIBS_PROMETHEUS_PORT="2112"

# =============================================================================
# Logging
# =============================================================================
RIBS_LOGLEVEL=".*:.*=info"

# =============================================================================
# IPFS Path
# =============================================================================
IPFS_PATH="/data/fgw/ipfs"
EOF
echo "Created kuri2 settings"

This is the second of two nearly identical configuration files — the first, settings-kuri1.env, was created in the immediately preceding message (index 1989) for the node at IP 10.1.232.83. The file for kuri_02 (IP 10.1.232.84) differs only in the node ID, the YugabyteDB database name (filecoingw_kuri_02 instead of filecoingw_kuri_01), and the LocalWeb port and URL (7011 instead of 7010).

Why This Message Was Written: Context and Motivation

To understand why this message exists, we must step back and look at the larger arc of the conversation. The assistant was in the middle of deploying a QA test cluster for the Filecoin Gateway (FGW) distributed storage system across three physical nodes on a private network:

Assumptions Made by the Assistant

The assistant made several assumptions that proved incorrect:

Assumption 1: File permissions alone are sufficient protection. The assistant planned to set chmod 600 on the settings file, assuming that restricting access to the fgw user would be adequate. This overlooks several attack vectors: backup systems that might copy the file with different permissions, debugging sessions where an administrator might temporarily open the file, or accidental inclusion in version control.

Assumption 2: The user would accept plaintext secrets in a QA environment. The assistant implicitly treated the QA cluster as a lower-security environment where convenience could trump security. The user's forceful correction made clear that security practices apply regardless of environment — a QA cluster should mirror production security patterns.

Assumption 3: The settings file is the natural place for all configuration. The assistant followed the pattern of a single monolithic configuration file containing everything the daemon needs. The user's intervention demonstrated that secrets should be treated as a separate concern from configuration, with different storage and loading mechanisms.

What the Message Reveals About the Thinking Process

Although this message contains only a shell command and its output, the reasoning behind it is visible through the surrounding context. The assistant had just read the Ansible template for settings.env.j2 (message 1988) to understand the required variables. The template uses Jinja2 variable substitution ({{ fgw_node_id }}, {{ fgw_node_type }}, etc.) and is designed to be rendered by Ansible during deployment.

Rather than using the Ansible playbook system that had been developed earlier in the project, the assistant chose to construct the configuration files manually. This decision reflects a pragmatic trade-off: the Ansible playbooks might require additional setup or inventory adjustments, while a direct SSH-and-scp approach could get the cluster running faster. The assistant had already deployed binaries via scp and created users and directories via SSH commands, so continuing with the same pattern was consistent.

The two configuration files are nearly identical, differing only in the node-specific parameters. This duplication is a maintenance concern — if a parameter needs to change, both files must be updated. A templating approach (whether via Ansible or a simpler script) would be more maintainable. However, for a two-node QA cluster, the assistant apparently judged the duplication acceptable.

Input Knowledge Required

To understand this message fully, one needs knowledge of:

Output Knowledge Created

This message produced a configuration file for the second kuri node. This file, once deployed, would:

  1. Identify the node as kuri_02 of type storage
  2. Configure database connections pointing to the YugabyteDB instance on the head node, with per-node SQL database filecoingw_kuri_02 and CQL keyspace filecoingw_kuri_02
  3. Configure the shared S3 keyspace (filecoingw_s3) for cross-node object routing
  4. Set up the LocalWeb CAR staging server on port 7011
  5. Configure deal-making parameters including replica counts, deal duration, and check intervals
  6. Set the Filecoin API endpoint to https://api.chain.love/rpc/v1
  7. Configure Prometheus metrics on port 2112
  8. Set logging level to .*:.*=info The configuration also contained the CIDgravity API token, which was the security flaw that triggered the user's intervention.

The Broader Significance

This message, while seemingly routine, illustrates a fundamental tension in infrastructure automation: the conflict between speed and security. The assistant prioritized getting the cluster running quickly by embedding everything in a single file. The user prioritized security by insisting on a vault-like separation of secrets.

The correction that followed this message had lasting consequences for the deployment. The systemd service files were redesigned with an ExecStartPre pattern that reads the token at runtime, creating a clean separation between static configuration and dynamic secrets. This pattern — loading secrets from a restricted file at service start time — is more complex than embedding them directly, but it provides significantly better security properties: