feat: ship host metrics as a first-party in-process plugin

plugins/host-metrics/backend/widgets/login-stats-collector.ts

@@ -0,0 +1,149 @@
+import type { Client } from "ssh2";
+import { execCommand } from "../../../../src/backend/hosts/metrics-shared/common-utils.js";
+
+export interface LoginRecord {
+  user: string;
+  ip: string;
+  time: string;
+  status: "success" | "failed";
+}
+
+export interface LoginStats {
+  recentLogins: LoginRecord[];
+  failedLogins: LoginRecord[];
+  totalLogins: number;
+  uniqueIPs: number;
+}
+
+export async function collectLoginStats(client: Client): Promise<LoginStats> {
+  const recentLogins: LoginRecord[] = [];
+  const failedLogins: LoginRecord[] = [];
+  const ipSet = new Set<string>();
+
+  try {
+    const lastOut = await execCommand(
+      client,
+      "last -n 20 -F -w | grep -v 'reboot' | grep -v 'wtmp' | head -20",
+    );
+
+    const lastLines = lastOut.stdout
+      .split("\n")
+      .map((l) => l.trim())
+      .filter(Boolean);
+
+    for (const line of lastLines) {
+      const parts = line.split(/\s+/);
+      if (parts.length >= 10) {
+        const user = parts[0];
+        const tty = parts[1];
+        const ip =
+          parts[2] === ":" || parts[2].startsWith(":") ? "local" : parts[2];
+
+        const timeStart = parts.indexOf(
+          parts.find((p) => /^(Mon|Tue|Wed|Thu|Fri|Sat|Sun)/.test(p)) || "",
+        );
+        if (timeStart > 0 && parts.length > timeStart + 4) {
+          const timeStr = parts.slice(timeStart, timeStart + 5).join(" ");
+
+          if (user && user !== "wtmp" && tty !== "system") {
+            let parsedTime: string;
+            try {
+              const date = new Date(timeStr);
+              parsedTime = isNaN(date.getTime())
+                ? timeStr || "unknown"
+                : date.toISOString();
+            } catch {
+              parsedTime = timeStr || "unknown";
+            }
+
+            recentLogins.push({
+              user,
+              ip,
+              time: parsedTime,
+              status: "success",
+            });
+            if (ip !== "local") {
+              ipSet.add(ip);
+            }
+          }
+        }
+      }
+    }
+  } catch {
+    // expected
+  }
+
+  try {
+    const failedOut = await execCommand(
+      client,
+      "grep 'Failed password' /var/log/auth.log 2>/dev/null | tail -10 || grep 'authentication failure' /var/log/secure 2>/dev/null | tail -10 || echo ''",
+    );
+
+    const failedLines = failedOut.stdout
+      .split("\n")
+      .map((l) => l.trim())
+      .filter(Boolean);
+
+    for (const line of failedLines) {
+      let user = "unknown";
+      let ip = "unknown";
+      let timeStr = "";
+
+      const userMatch = line.match(/for (?:invalid user )?(\S+)/);
+      if (userMatch) {
+        user = userMatch[1];
+      }
+
+      const ipMatch = line.match(/from (\d+\.\d+\.\d+\.\d+)/);
+      if (ipMatch) {
+        ip = ipMatch[1];
+      }
+
+      const dateMatch = line.match(/^(\w+)\s+(\d+)\s+(\d+:\d+:\d+)/);
+      if (dateMatch) {
+        const [, month, day, time] = dateMatch;
+        const now = new Date();
+        const currentYear = now.getFullYear();
+        const candidate = new Date(`${month} ${day}, ${currentYear} ${time}`);
+        if (!isNaN(candidate.getTime()) && candidate > now) {
+          // If parsed date is in the future, it's from last year
+          timeStr = `${month} ${day}, ${currentYear - 1} ${time}`;
+        } else {
+          timeStr = `${month} ${day}, ${currentYear} ${time}`;
+        }
+      }
+
+      if (user && ip) {
+        let parsedTime: string;
+        try {
+          const date = timeStr ? new Date(timeStr) : null;
+          parsedTime =
+            date && !isNaN(date.getTime())
+              ? date.toISOString()
+              : timeStr || "unknown";
+        } catch {
+          parsedTime = timeStr || "unknown";
+        }
+
+        failedLogins.push({
+          user,
+          ip,
+          time: parsedTime,
+          status: "failed",
+        });
+        if (ip !== "unknown") {
+          ipSet.add(ip);
+        }
+      }
+    }
+  } catch {
+    // expected
+  }
+
+  return {
+    recentLogins: recentLogins.slice(0, 10),
+    failedLogins: failedLogins.slice(0, 10),
+    totalLogins: recentLogins.length,
+    uniqueIPs: ipSet.size,
+  };
+}