Implement policy checks and automated updates (#25829)

This is the initial pull request to implement keeping policy logic up to
date automatically. For example, when a new version of macOS releases,
admins don't need to manually update the policy logic for checking
version numbers.

This is currently blocked by this issue: fleetdm/confidential#9470
This is also to support the following issue and demonstrate to customers
a fully automated patch management strategy:
fleetdm/confidential#8825

This current iteration contains a script/workflow that runs every 6
hours to check if a new version of macOS has been released and compares
the version string to what is currently defined in our policy. If it
detects a change, it will automatically create a new branch with the
updated version string and create a pull request to be reviewed before
merging.

.github/scripts/dogfood-policy-updater-latest-macos.sh

@@ -0,0 +1,108 @@
+#!/bin/bash
+
+# Variables
+REPO_OWNER="fleetdm"
+REPO_NAME="fleet"
+FILE_PATH="it-and-security/lib/macos/policies/latest-macos.yml"
+BRANCH="main"
+NEW_BRANCH="update-macos-version-$(date +%s)"
+
+# Ensure required environment variables are set
+if [ -z "$DOGFOOD_AUTOMATION_TOKEN" ] || [ -z "$DOGFOOD_AUTOMATION_USER_NAME" ] || [ -z "$DOGFOOD_AUTOMATION_USER_EMAIL" ]; then
+    echo "Error: Missing required environment variables."
+    exit 1
+fi
+
+# GitHub API URL
+FILE_URL="https://api.github.com/repos/$REPO_OWNER/$REPO_NAME/contents/$FILE_PATH?ref=$BRANCH"
+
+# Fetch the file contents from GitHub
+response=$(curl -s -H "Authorization: token $DOGFOOD_AUTOMATION_TOKEN" -H "Accept: application/vnd.github.v3.raw" "$FILE_URL")
+
+if [ -z "$response" ] || [[ "$response" == *"Not Found"* ]]; then
+    echo "Error: Failed to fetch file or file does not exist in the repository."
+    exit 1
+fi
+
+# Extract the query line
+query_line=$(echo "$response" | grep 'query:')
+if [ -z "$query_line" ]; then
+    echo "Error: Could not find the query line in the file."
+    exit 1
+fi
+
+# Extract the version number from the query line
+policy_version_number=$(echo "$query_line" | grep -oE "'[0-9]+\.[0-9]+(\.[0-9]+)?'" | sed "s/'//g")
+if [ -z "$policy_version_number" ]; then
+    echo "Error: Failed to extract the policy version number."
+    exit 1
+fi
+
+echo "Policy version number: $policy_version_number"
+
+# Fetch the latest macOS version
+latest_macos_version=$(curl -s "https://sofafeed.macadmins.io/v1/macos_data_feed.json" | \
+jq -r '.. | objects | select(has("ProductVersion")) | .ProductVersion' | sort -Vr | head -n 1)
+
+if [ -z "$latest_macos_version" ]; then
+    echo "Error: Failed to fetch the latest macOS version."
+    exit 1
+fi
+
+echo "Latest macOS version: $latest_macos_version"
+
+# Compare versions and update the file if needed
+if [ "$policy_version_number" != "$latest_macos_version" ]; then
+    echo "Updating query line with the new version..."
+
+    # Prepare the new query line
+    new_query_line="query: SELECT 1 FROM os_version WHERE version >= '$latest_macos_version';"
+
+    # Update the response
+    updated_response=$(echo "$response" | sed "s/query: .*/$new_query_line/")
+    if [ -z "$updated_response" ]; then
+        echo "Error: Failed to update the query line."
+        exit 1
+    fi
+
+    # Create a temporary file for the update
+    temp_file=$(mktemp)
+    echo "$updated_response" > "$temp_file"
+
+    # Configure Git
+    git config --global user.name "$DOGFOOD_GIT_USER_NAME"
+    git config --global user.email "$DOGFOOD_GIT_USER_EMAIL"
+
+    # Clone the repository and create a new branch
+    git clone "https://$DOGFOOD_AUTOMATION_TOKEN@github.com/$REPO_OWNER/$REPO_NAME.git" repo || {
+        echo "Error: Failed to clone repository."
+        exit 1
+    }
+    cd repo || exit
+    git checkout -b "$NEW_BRANCH"
+    cp "$temp_file" "$FILE_PATH"
+    git add "$FILE_PATH"
+    git commit -m "Update macOS version number to $latest_macos_version"
+    git push origin "$NEW_BRANCH"
+
+    # Create a pull request
+    pr_data=$(jq -n --arg title "Update macOS version number to $latest_macos_version" \
+                 --arg head "$NEW_BRANCH" \
+                 --arg base "$BRANCH" \
+                 '{title: $title, head: $head, base: $base}')
+
+    pr_response=$(curl -s -H "Authorization: token $DOGFOOD_AUTOMATION_TOKEN" \
+        -H "Accept: application/vnd.github.v3+json" \
+        -X POST \
+        -d "$pr_data" \
+        "https://api.github.com/repos/$REPO_OWNER/$REPO_NAME/pulls")
+
+    if [[ "$pr_response" == *"Validation Failed"* ]]; then
+        echo "Error: Failed to create a pull request. Response: $pr_response"
+        exit 1
+    fi
+
+    echo "Pull request created successfully."
+else
+    echo "No updates needed; the version is the same."
+fi

.github/workflows/dogfood-automated-policy-updates.yml

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+name: "Automated policy updates for dogfood"
+
+on:
+  schedule:
+    - cron: '0 */6 * * *'  # Run every 6 hours
+  workflow_dispatch:     # Allow manual trigger
+
+jobs:
+  update-macos-versions:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Git
+        run: |
+          git config --global user.name "GitHub Action"
+          git config --global user.email "action@github.com"
+
+      - name: Run macOS version update script
+        run: |
+          chmod +x ./.github/scripts/dogfood-policy-updater-latest-macos.sh
+          ./.github/scripts/dogfood-policy-updater-latest-macos.sh
+        env:
+          DOGFOOD_AUTOMATION_TOKEN: ${{ secrets.DOGFOOD_AUTOMATION_TOKEN }}
+          DOGFOOD_AUTOMATION_USER_NAME: ${{ secrets.DOGFOOD_AUTOMATION_USER_NAME }}
+          DOGFOOD_AUTOMATION_USER_EMAIL: ${{ secrets.DOGFOOD_AUTOMATION_USER_EMAIL }}