bastion 0.61.0
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Privatae
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# M1 gate, Linux: an agent on the machine asks, the machine's owner answers
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Run 2026-11-02 on the Ubuntu 24.04 virtual machine the [M0 gate](m0-gate-linux-2026-10-31.md)
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used (qemu, user-mode networking), with no Host anywhere. The bastion is
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installed for the whole machine (its systemd unit, running as root), and
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`tester` is recorded as the machine's owner. `other` is a second account with
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no sudo. The binary was built from the 0.61.0 release branch just before this
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record was added (`privatae-bastion version`: `0.61.0+090bdb8`) and put in
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place of the installed one.
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The asker is an AI agent the bastion recognises: a program at
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`~/.local/bin/claude`, which it lists as Claude Code, started from a remote
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login (ssh). The target is `aider`, started every minute by a cron job in
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`tester`'s crontab. Both are stand-ins (`sh` and `sleep` under those names),
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which is how the bastion meets them anyway: by the program a process runs and
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how it was started.
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macOS and Windows have not been run. On Windows an agent cannot ask yet,
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because the ask socket is Unix only ([STATUS](../STATUS.md)).
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| Gate step | Result |
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|---|---|
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| The agent lists the AI agents on the machine (`agents --json`) | `aider` (started by a scheduled job) and Claude Code (started from a remote login), with pids and accounts |
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| The agent asks to stop `aider` (`stop <pid> --json`) | A request id and state `waiting`; the request names the agent that asked and the target |
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| The owner lists what waits, from their own account (`approvals --machine`) | The request, in the same words |
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| The owner approves with a wrong code | Refused; nothing stopped |
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| The owner approves with the code from their authenticator (`approve --machine <id>`) | Approved, and the bastion carried it out |
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| The agent follows its request (`request <id> --wait 30s --json`) | State `stopped`, outcome "You stopped aider"; the process is gone |
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| The agent asks to stop the next cron'd `aider`; the owner denies it (`deny --machine <id>`, no code) | Denied; the agent's `request` reads `denied` with exit status 1; `aider` keeps running |
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| The agent asks the same stop again | Refused: the owner refused this same stop within the last 24 hours |
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| `other` tries `approvals --machine`, `approve`, `deny`, `doctor` | Each refused, naming the owner's account, with the administrator's command as typed (`sudo -H privatae-bastion approve --machine <id>`); the request stays waiting |
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| `other` reads `agents --json` | Told the machine's bastion answers only its owner, and shown what that account can read itself |
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| `other` asks after the agent's request (`request <id>`) | `unknown`: no such request was asked from that account |
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| The machine's audit log | Each ask, approval and denial names the asking account, the asking agent (Claude Code, remote login) and the target (aider, scheduled job); each act from the owner's account is its own line naming that account |
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Found and fixed while running M1 on this machine, before this record:
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`switch --list` was refused by the M0 guard meant for `switch`; a read the
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bastion answered but could not build came back as a refusal with the
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administrator's command; "not paired" named `pair` without `sudo -H`; an act
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refused for another account said "reads" and gave a bare `deny`; and
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`approve` and `approvals --machine` from another account were refused as a
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read and without `--machine`.
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## Transcript (abridged)
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```
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$ ~/.local/bin/claude -c 'privatae-bastion agents --json' # summarised
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aider pid 5162 origin scheduler user tester
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claude-code pid 5265 origin remote user tester
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$ ~/.local/bin/claude -c 'privatae-bastion stop 5162 --json'
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{
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"request": "857285ef",
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"state": "waiting",
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"text": "Stop aider in /home/tester (pid 5162) on this machine, and every process it started. Asked from Claude Code (pid 5324), running as tester.",
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"asked_as": "tester"
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}
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$ privatae-bastion approvals --machine
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[857285ef] asked 2026-11-02T05:23:07Z
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Stop aider in /home/tester (pid 5162) on this machine, and every process it started. Asked from Claude Code (pid 5324), running as tester.
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$ privatae-bastion approve --machine 857285ef # a wrong code
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Approve this? Enter the code from your authenticator (or leave empty to cancel): error: code refused
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$ privatae-bastion approve --machine 857285ef
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Approve this? Enter the code from your authenticator (or leave empty to cancel): approved.
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$ ~/.local/bin/claude -c 'privatae-bastion request 857285ef --wait 30s --json'
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{
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"request": "857285ef",
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"state": "stopped",
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"outcome": "You stopped aider (pid 5162) running on this machine.",
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...
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}
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$ ~/.local/bin/claude -c 'privatae-bastion stop 6145 --json' # the next cron'd aider
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"request": "f090208b", "state": "waiting"
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other$ privatae-bastion approve --machine f090208b
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error: this machine's bastion acts only for its owner's account (tester), not other
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As the administrator: sudo -H privatae-bastion approve --machine f090208b
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other$ privatae-bastion approvals --machine
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error: this machine's bastion answers reads only for its owner's account (tester), not other
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As the administrator: sudo -H privatae-bastion approvals --machine
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$ privatae-bastion deny --machine f090208b
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denied.
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$ ~/.local/bin/claude -c 'privatae-bastion request f090208b --json'
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"state": "denied" (exit status 1)
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$ ~/.local/bin/claude -c 'privatae-bastion stop 6145 --json'
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"why": "the machine's owner refused this same stop within the last 24 hours, so it cannot be asked again yet"
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# the machine's audit log (machine-factor/audit.jsonl), summarised
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05:23:07Z local_stop_ask asked to stop aider (pid 5162) asker: tester, claude-code, remote target: aider, scheduler
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05:23:08Z stepup_approve approved: local_stop|5162|aider asker: tester, claude-code, remote target: aider, scheduler
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05:23:08Z owner_lane_act approve the machine's request 857285ef…, from the owner's account tester through its ask socket
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05:24:04Z local_stop_ask asked to stop aider (pid 6145) asker: tester, claude-code, remote target: aider, scheduler
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05:24:06Z stepup_deny denied: local_stop|6145|aider asker: tester, claude-code, remote target: aider, scheduler
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05:24:06Z owner_lane_act deny the machine's request f090208b…, from the owner's account tester through its ask socket
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```
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