7ab45487dd
- enabling execpolicy2 parser to parse multiple policy files to build a combined `Policy` (useful if codex detects many `.codexpolicy` files) - adding functionality to `Policy` to allow evaluation of multiple cmds at once (useful when we have chained commands)
59 lines
2.3 KiB
Markdown
59 lines
2.3 KiB
Markdown
# codex-execpolicy2
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## Overview
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- Policy engine and CLI built around `prefix_rule(pattern=[...], decision?, match?, not_match?)`.
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- This release covers only the prefix-rule subset of the planned execpolicy v2 language; a richer language will follow.
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- Tokens are matched in order; any `pattern` element may be a list to denote alternatives. `decision` defaults to `allow`; valid values: `allow`, `prompt`, `forbidden`.
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- `match` / `not_match` supply example invocations that are validated at load time (think of them as unit tests); examples can be token arrays or strings (strings are tokenized with `shlex`).
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- The CLI always prints the JSON serialization of the evaluation result (whether a match or not).
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## Policy shapes
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- Prefix rules use Starlark syntax:
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```starlark
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prefix_rule(
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pattern = ["cmd", ["alt1", "alt2"]], # ordered tokens; list entries denote alternatives
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decision = "prompt", # allow | prompt | forbidden; defaults to allow
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match = [["cmd", "alt1"], "cmd alt2"], # examples that must match this rule
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not_match = [["cmd", "oops"], "cmd alt3"], # examples that must not match this rule
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)
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```
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## Response shapes
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- Match:
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```json
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{
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"match": {
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"decision": "allow|prompt|forbidden",
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"matchedRules": [
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{
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"prefixRuleMatch": {
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"matchedPrefix": ["<token>", "..."],
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"decision": "allow|prompt|forbidden"
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}
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}
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]
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}
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}
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```
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- No match:
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```json
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"noMatch"
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```
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- `matchedRules` lists every rule whose prefix matched the command; `matchedPrefix` is the exact prefix that matched.
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- The effective `decision` is the strictest severity across all matches (`forbidden` > `prompt` > `allow`).
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## CLI
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- Provide one or more policy files (for example `src/default.codexpolicy`) to check a command:
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```bash
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cargo run -p codex-execpolicy2 -- check --policy path/to/policy.codexpolicy git status
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```
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- Pass multiple `--policy` flags to merge rules, evaluated in the order provided:
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```bash
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cargo run -p codex-execpolicy2 -- check --policy base.codexpolicy --policy overrides.codexpolicy git status
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```
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- Output is newline-delimited JSON by default; pass `--pretty` for pretty-printed JSON if desired.
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- Example outcomes:
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- Match: `{"match": { ... "decision": "allow" ... }}`
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- No match: `"noMatch"`
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