vault: implement bootstrap integration

scripts/vault-fetch/vault-fetch.sh

@@ -0,0 +1,152 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# vault-fetch: Fetch secrets from OpenBao/Vault and write to filesystem
+#
+# Usage: vault-fetch <secret-path> <output-directory> [cache-directory]
+#
+# Example: vault-fetch hosts/monitoring01/grafana-admin /run/secrets/grafana /var/lib/vault/cache/grafana
+#
+# This script:
+# 1. Authenticates to Vault using AppRole credentials from /var/lib/vault/approle/
+# 2. Fetches secrets from the specified path
+# 3. Writes each secret key as an individual file in the output directory
+# 4. Updates cache for fallback when Vault is unreachable
+# 5. Falls back to cache if Vault authentication fails or is unreachable
+
+# Parse arguments
+if [ $# -lt 2 ]; then
+    echo "Usage: vault-fetch <secret-path> <output-directory> [cache-directory]" >&2
+    echo "Example: vault-fetch hosts/monitoring01/grafana /run/secrets/grafana /var/lib/vault/cache/grafana" >&2
+    exit 1
+fi
+
+SECRET_PATH="$1"
+OUTPUT_DIR="$2"
+CACHE_DIR="${3:-/var/lib/vault/cache/$(basename "$OUTPUT_DIR")}"
+
+# Vault configuration
+VAULT_ADDR="${VAULT_ADDR:-https://vault01.home.2rjus.net:8200}"
+VAULT_SKIP_VERIFY="${VAULT_SKIP_VERIFY:-1}"
+APPROLE_DIR="/var/lib/vault/approle"
+
+# TLS verification flag for curl
+if [ "$VAULT_SKIP_VERIFY" = "1" ]; then
+    CURL_TLS_FLAG="-k"
+else
+    CURL_TLS_FLAG=""
+fi
+
+# Logging helper
+log() {
+    echo "[vault-fetch] $*" >&2
+}
+
+# Error handler
+error() {
+    log "ERROR: $*"
+    exit 1
+}
+
+# Check if cache is available
+has_cache() {
+    [ -d "$CACHE_DIR" ] && [ -n "$(ls -A "$CACHE_DIR" 2>/dev/null)" ]
+}
+
+# Use cached secrets
+use_cache() {
+    if ! has_cache; then
+        error "No cache available and Vault is unreachable"
+    fi
+
+    log "WARNING: Using cached secrets from $CACHE_DIR"
+    mkdir -p "$OUTPUT_DIR"
+    cp -r "$CACHE_DIR"/* "$OUTPUT_DIR/"
+    chmod -R u=rw,go= "$OUTPUT_DIR"/*
+}
+
+# Fetch secrets from Vault
+fetch_from_vault() {
+    # Read AppRole credentials
+    if [ ! -f "$APPROLE_DIR/role-id" ] || [ ! -f "$APPROLE_DIR/secret-id" ]; then
+        log "WARNING: AppRole credentials not found at $APPROLE_DIR"
+        use_cache
+        return
+    fi
+
+    ROLE_ID=$(cat "$APPROLE_DIR/role-id")
+    SECRET_ID=$(cat "$APPROLE_DIR/secret-id")
+
+    # Authenticate to Vault
+    log "Authenticating to Vault at $VAULT_ADDR"
+    AUTH_RESPONSE=$(curl -s $CURL_TLS_FLAG -X POST \
+        -d "{\"role_id\":\"$ROLE_ID\",\"secret_id\":\"$SECRET_ID\"}" \
+        "$VAULT_ADDR/v1/auth/approle/login" 2>&1) || {
+        log "WARNING: Failed to connect to Vault"
+        use_cache
+        return
+    }
+
+    # Check for errors in response
+    if echo "$AUTH_RESPONSE" | jq -e '.errors' >/dev/null 2>&1; then
+        ERRORS=$(echo "$AUTH_RESPONSE" | jq -r '.errors[]' 2>/dev/null || echo "Unknown error")
+        log "WARNING: Vault authentication failed: $ERRORS"
+        use_cache
+        return
+    fi
+
+    # Extract token
+    VAULT_TOKEN=$(echo "$AUTH_RESPONSE" | jq -r '.auth.client_token' 2>/dev/null)
+    if [ -z "$VAULT_TOKEN" ] || [ "$VAULT_TOKEN" = "null" ]; then
+        log "WARNING: Failed to extract Vault token from response"
+        use_cache
+        return
+    fi
+
+    log "Successfully authenticated to Vault"
+
+    # Fetch secret
+    log "Fetching secret from path: $SECRET_PATH"
+    SECRET_RESPONSE=$(curl -s $CURL_TLS_FLAG \
+        -H "X-Vault-Token: $VAULT_TOKEN" \
+        "$VAULT_ADDR/v1/secret/data/$SECRET_PATH" 2>&1) || {
+        log "WARNING: Failed to fetch secret from Vault"
+        use_cache
+        return
+    }
+
+    # Check for errors
+    if echo "$SECRET_RESPONSE" | jq -e '.errors' >/dev/null 2>&1; then
+        ERRORS=$(echo "$SECRET_RESPONSE" | jq -r '.errors[]' 2>/dev/null || echo "Unknown error")
+        log "WARNING: Failed to fetch secret: $ERRORS"
+        use_cache
+        return
+    fi
+
+    # Extract secret data
+    SECRET_DATA=$(echo "$SECRET_RESPONSE" | jq -r '.data.data' 2>/dev/null)
+    if [ -z "$SECRET_DATA" ] || [ "$SECRET_DATA" = "null" ]; then
+        log "WARNING: No secret data found at path $SECRET_PATH"
+        use_cache
+        return
+    fi
+
+    # Create output and cache directories
+    mkdir -p "$OUTPUT_DIR"
+    mkdir -p "$CACHE_DIR"
+
+    # Write each secret key to a separate file
+    log "Writing secrets to $OUTPUT_DIR"
+    echo "$SECRET_DATA" | jq -r 'to_entries[] | "\(.key)\n\(.value)"' | while read -r key; read -r value; do
+        echo -n "$value" > "$OUTPUT_DIR/$key"
+        echo -n "$value" > "$CACHE_DIR/$key"
+        chmod 600 "$OUTPUT_DIR/$key"
+        chmod 600 "$CACHE_DIR/$key"
+        log "  - Wrote secret key: $key"
+    done
+
+    log "Successfully fetched and cached secrets"
+}
+
+# Main execution
+fetch_from_vault