52 lines
2.1 KiB
TypeScript
52 lines
2.1 KiB
TypeScript
// fail2ban's own code, in the module (novox/hq ADR 0039). The jails and the daemon are declared
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// resources — the mesh writes /etc/fail2ban/jail.d/* and keeps fail2ban.service running (see
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// module.json). This code exists only to read and steer the *live* state the daemon owns at
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// runtime: which IPs are banned right now, and the manual ban/unban an operator reaches for. That
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// state (the running bans, /var/lib/fail2ban's sqlite) is fail2ban's, not the mesh's — the mesh
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// reconciles the config, never the ban list.
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import { execFile } from "node:child_process";
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import { promisify } from "node:util";
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const run = promisify(execFile);
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export class Fail2banClient {
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static fromEnv(_env: NodeJS.ProcessEnv = process.env): Fail2banClient {
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return new Fail2banClient();
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}
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/** Overview of every jail, or the detailed status of one — currently-banned IPs and totals. */
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async status(jail?: string): Promise<string> {
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if (jail) {
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const { stdout } = await run("sudo", ["fail2ban-client", "status", jail]);
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return stdout;
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}
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const { stdout: overview } = await run("sudo", ["fail2ban-client", "status"]);
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const match = overview.match(/Jail list:\s*(.+)/);
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if (!match) return overview;
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const jails = match[1].split(",").map((j) => j.trim()).filter(Boolean);
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const parts: string[] = [overview.trimEnd(), ""];
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for (const j of jails) {
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const { stdout } = await run("sudo", ["fail2ban-client", "status", j]);
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parts.push(`=== ${j} ===`, stdout.trimEnd(), "");
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}
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return parts.join("\n");
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}
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/** Manually ban an IP in a jail. Mutates live state, not a mesh-managed file. */
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async ban(jail: string, ip: string): Promise<string> {
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const { stdout } = await run("sudo", ["fail2ban-client", "set", jail, "banip", ip]);
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return stdout;
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}
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/** Unban an IP from one jail, or from every jail when no jail is given. */
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async unban(ip: string, jail?: string): Promise<string> {
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const args = jail
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? ["fail2ban-client", "set", jail, "unbanip", ip]
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: ["fail2ban-client", "unban", ip];
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const { stdout } = await run("sudo", args);
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return stdout;
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}
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}
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