bastion 0.60.0
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Privatae
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# M0 gate, Linux: the bastion on its own, on a fresh machine
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Run 2026-10-31 on a fresh Ubuntu 24.04.5 virtual machine (qemu, user-mode
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networking), with no Host anywhere. Two invented accounts: `tester`, who may
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use sudo without a password, and `other`, who may not use sudo. The binary was
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built from branch `m0/install-cli-docs` and served, with a manifest and a copy
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of `deploy/install.sh` whose two download addresses point at that server, from
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the machine running the VM. Nothing else in the installer was changed.
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macOS and Windows have not been run yet.
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| Gate step | Result |
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|---|---|
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| Install as a person, `curl … \| sh`, no sudo typed | Installed for the whole machine through sudo; systemd unit running as root; `tester` recorded as the owner |
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| `status` from the owner's account | Says the bastion runs for the whole machine and points at `privatae-bastion ui` |
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| `ui` from the owner's account | A one-use link; redeemed, it opens a limited session; a second use is refused |
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| Limited session | Every page loads; pairing is refused with the administrator's command; Settings shows that command instead of the form |
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| `ui` from `other` | Refused: the console opens without sudo only for the owner's account |
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| Agents planted: a cron'd `aider`, `claude` in a terminal, a Python program keeping a TLS connection to api.anthropic.com | All listed: `aider` started by a scheduled job, Claude Code started from a terminal, the Python program as a model client talking to api.anthropic.com |
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| Stop the cron'd `aider` from the console, from the owner's account, with the owner's code | Stopped; the cron shell and `aider` are gone; Activity says "You stopped aider"; the audit row is in the system log |
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| `report` | One Markdown file: summary, agents running now, scheduled jobs, MCP tool servers, changes since the baseline, activity |
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| Service log, grep host/lane/pair | No line waiting for or retrying a Host |
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| `other` runs the installer | Refused: the machine's bastion is installed for the whole machine and updating it needs sudo; nothing installed |
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| Reinstall by `tester` | Service restarted on the new program; the owner record kept |
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| `sudo -H privatae-bastion uninstall` | Unit and program removed; state kept (owner record, owner's code, audit log, reports) |
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Found and fixed during the run (commit e46bd57): `sudo -v` asked for a
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password where the account's sudo rules were not all NOPASSWD, so the installer
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fell back to an install for the account; an account without sudo beside the
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machine's bastion got a second one that could not run; `uninstall` from that
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account was refused.
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The first test of the model client used a socket that never started TLS.
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api.anthropic.com closed it, and the bastion, which counts open connections
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only, did not list it. The second, which keeps a live connection, was listed.
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## Transcript (abridged)
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```
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$ curl -fsSL http://10.0.2.2:8099/install.sh | sh
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Installing the bastion for the whole machine, so that no program running as you, an AI agent included, can stop it or change what it allows.
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sudo asks for your password once.
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Fetching manifest...
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Downloading privatae-bastion (linux-amd64)...
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Checksum verified (…).
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Installed: /usr/local/bin/privatae-bastion
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this machine's owner account is tester: `privatae-bastion ui` opens the console from it.
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Anything that stops an agent or widens access still takes the owner's code.
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The bastion runs for the whole machine and starts at boot. It is watching the AI agents on this computer now; no Host is needed.
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Open its console: privatae-bastion ui
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Set up your code, to stop an agent or answer what agents ask (an authenticator app on your phone):
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sudo -H privatae-bastion stepup-enroll --machine
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Connect a Host, if you run one (optional): sudo -H privatae-bastion pair <token>
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$ ps -o user=,args= -C privatae-bastion
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root /usr/local/bin/privatae-bastion run
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$ privatae-bastion status
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error: this machine's bastion runs for the whole machine, as a system service.
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Open its console from your own account: privatae-bastion ui
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Its full status: sudo -H privatae-bastion status
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$ privatae-bastion ui
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opening the local UI: http://127.0.0.1:7877
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could not open a browser (exec: "xdg-open": executable file not found in $PATH).
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Paste this into one, within a minute:
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http://127.0.0.1:7877/?k=…
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redeem=303 GET /=200 /setup=200 /approvals=200 /activity=200 /machine=200
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POST /setup/pair=403 From your own account the console does not do this: it widens what reaches this machine and takes no code. The machine's administrator does it: sudo -H privatae-bastion ui
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reuse of the link=403
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(other)$ privatae-bastion ui
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error: this machine's console opens without sudo only for its owner's account (tester), not other
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$ sudo -H privatae-bastion agents
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aider: 2 sessions
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aider in tester
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in /home/tester · started 1m ago · started by a scheduled job · as tester · pid 2018
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…
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Claude Code: 1 session
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Claude Code in tester
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in /home/tester · started 1m ago · started from a terminal here · as tester · pid 1903
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$ sudo -H privatae-bastion agents --json (the model client)
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2220 llm-client evidence: model-traffic api.anthropic.com (verified), model-endpoint api.anthropic.com (verified)
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POST /agent/stop pid=2018 with the owner's code → 200 "stopped aider (pid 2018) running on this machine."
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$ ps -p 2017,2018 → process tree gone
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$ sudo -H privatae-bastion activity
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Oct 31 03:52 You stopped aider (pid 2018) running on this machine.
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journal: privatae-bastion-audit: {"decision":"You stopped aider (pid 2018) running on this machine.","op":"local_stop",…}
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$ sudo -H privatae-bastion report
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report written to /root/.config/privatae-bastion/reports/report-2026-10-31-035215.md
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# AI agents on m0-gate / ## Summary / ## Agents running now / ## Scheduled jobs that start an agent /
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## MCP tool servers / ## Changes since the baseline / ## Activity
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$ journalctl -u privatae-bastion | grep -iE 'host|lane|pair'
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privatae-bastion: no Host connected: watching this machine on its own. Open the console with `privatae-bastion ui`.
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(the rest are systemd's start lines)
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(other)$ curl -fsSL http://10.0.2.2:8099/install.sh | sh
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… ERROR: this machine's bastion is installed for the whole machine, and updating it needs an account that may use sudo, in a terminal. Nothing was installed.
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$ sudo -H privatae-bastion uninstall
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stopped the system service privatae-bastion
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removed /usr/local/bin/privatae-bastion
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Kept /root/.config/privatae-bastion: its pairings, keys and the audit log of what Hosts and agents did here.
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The bastion is uninstalled.
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```
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