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Stop adding GitHub SSH keys (#171)
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We need to fix the SSH keys shipped with this action:
https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/

But, we have another issue
(#108) with regards to host
keys: On self-hosted runners which are not ephemeral the known_host file
fills up with repeated entries, because every action run adds a new line
with the same host keys.

Also, on those machines, the old key will still be in the `known_hosts`
file.

IMHO this action should not be repsonsible for shipping SSH host keys,
that's too much responsibility.

This section in the code is a leftover from early days when GitHub
provided runners did not include SSH keys at all. For a long time
already, GH takes care of placing their SSH keys in their runner images.

For self-hosted runners, those people setting up the runner should fetch
and verify SSH keys themselves and put it into the `known_hosts` file.

I know this is a breaking change and is going to annoy users. But on the
other hand, there is no better opportunity to drop this feature than
with an emergency-style key revocation as today.

Closes #106, closes #129, closes #169, closes #170, closes #172.
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@mpdude
mpdude committed Mar 24, 2023
1 parent ea17a05 commit d4b9b8f
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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -272,4 +272,4 @@ developer looking for new challenges, we'd like to hear from you!
- <https://www.webfactory.de>
- <https://twitter.com/webfactory>

Copyright 2019 – 2022 webfactory GmbH, Bonn. Code released under [the MIT license](LICENSE).
Copyright 2019 – 2023 webfactory GmbH, Bonn. Code released under [the MIT license](LICENSE).
57 changes: 36 additions & 21 deletions dist/cleanup.js
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Original file line number Diff line number Diff line change
Expand Up @@ -292,13 +292,14 @@ var __importStar = (this && this.__importStar) || function (mod) {
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.issueCommand = void 0;
exports.prepareKeyValueMessage = exports.issueFileCommand = void 0;
// We use any as a valid input type
/* eslint-disable @typescript-eslint/no-explicit-any */
const fs = __importStar(__webpack_require__(747));
const os = __importStar(__webpack_require__(87));
const uuid_1 = __webpack_require__(62);
const utils_1 = __webpack_require__(82);
function issueCommand(command, message) {
function issueFileCommand(command, message) {
const filePath = process.env[`GITHUB_${command}`];
if (!filePath) {
throw new Error(`Unable to find environment variable for file command ${command}`);
Expand All @@ -310,7 +311,22 @@ function issueCommand(command, message) {
encoding: 'utf8'
});
}
exports.issueCommand = issueCommand;
exports.issueFileCommand = issueFileCommand;
function prepareKeyValueMessage(key, value) {
const delimiter = `ghadelimiter_${uuid_1.v4()}`;
const convertedValue = utils_1.toCommandValue(value);
// These should realistically never happen, but just in case someone finds a
// way to exploit uuid generation let's not allow keys or values that contain
// the delimiter.
if (key.includes(delimiter)) {
throw new Error(`Unexpected input: name should not contain the delimiter "${delimiter}"`);
}
if (convertedValue.includes(delimiter)) {
throw new Error(`Unexpected input: value should not contain the delimiter "${delimiter}"`);
}
return `${key}<<${delimiter}${os.EOL}${convertedValue}${os.EOL}${delimiter}`;
}
exports.prepareKeyValueMessage = prepareKeyValueMessage;
//# sourceMappingURL=file-command.js.map

/***/ }),
Expand Down Expand Up @@ -1668,7 +1684,6 @@ const file_command_1 = __webpack_require__(102);
const utils_1 = __webpack_require__(82);
const os = __importStar(__webpack_require__(87));
const path = __importStar(__webpack_require__(622));
const uuid_1 = __webpack_require__(62);
const oidc_utils_1 = __webpack_require__(742);
/**
* The code to exit an action
Expand Down Expand Up @@ -1698,20 +1713,9 @@ function exportVariable(name, val) {
process.env[name] = convertedVal;
const filePath = process.env['GITHUB_ENV'] || '';
if (filePath) {
const delimiter = `ghadelimiter_${uuid_1.v4()}`;
// These should realistically never happen, but just in case someone finds a way to exploit uuid generation let's not allow keys or values that contain the delimiter.
if (name.includes(delimiter)) {
throw new Error(`Unexpected input: name should not contain the delimiter "${delimiter}"`);
}
if (convertedVal.includes(delimiter)) {
throw new Error(`Unexpected input: value should not contain the delimiter "${delimiter}"`);
}
const commandValue = `${name}<<${delimiter}${os.EOL}${convertedVal}${os.EOL}${delimiter}`;
file_command_1.issueCommand('ENV', commandValue);
}
else {
command_1.issueCommand('set-env', { name }, convertedVal);
return file_command_1.issueFileCommand('ENV', file_command_1.prepareKeyValueMessage(name, val));
}
command_1.issueCommand('set-env', { name }, convertedVal);
}
exports.exportVariable = exportVariable;
/**
Expand All @@ -1729,7 +1733,7 @@ exports.setSecret = setSecret;
function addPath(inputPath) {
const filePath = process.env['GITHUB_PATH'] || '';
if (filePath) {
file_command_1.issueCommand('PATH', inputPath);
file_command_1.issueFileCommand('PATH', inputPath);
}
else {
command_1.issueCommand('add-path', {}, inputPath);
Expand Down Expand Up @@ -1769,7 +1773,10 @@ function getMultilineInput(name, options) {
const inputs = getInput(name, options)
.split('\n')
.filter(x => x !== '');
return inputs;
if (options && options.trimWhitespace === false) {
return inputs;
}
return inputs.map(input => input.trim());
}
exports.getMultilineInput = getMultilineInput;
/**
Expand Down Expand Up @@ -1802,8 +1809,12 @@ exports.getBooleanInput = getBooleanInput;
*/
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setOutput(name, value) {
const filePath = process.env['GITHUB_OUTPUT'] || '';
if (filePath) {
return file_command_1.issueFileCommand('OUTPUT', file_command_1.prepareKeyValueMessage(name, value));
}
process.stdout.write(os.EOL);
command_1.issueCommand('set-output', { name }, value);
command_1.issueCommand('set-output', { name }, utils_1.toCommandValue(value));
}
exports.setOutput = setOutput;
/**
Expand Down Expand Up @@ -1932,7 +1943,11 @@ exports.group = group;
*/
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function saveState(name, value) {
command_1.issueCommand('save-state', { name }, value);
const filePath = process.env['GITHUB_STATE'] || '';
if (filePath) {
return file_command_1.issueFileCommand('STATE', file_command_1.prepareKeyValueMessage(name, value));
}
command_1.issueCommand('save-state', { name }, utils_1.toCommandValue(value));
}
exports.saveState = saveState;
/**
Expand Down
63 changes: 36 additions & 27 deletions dist/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -292,13 +292,14 @@ var __importStar = (this && this.__importStar) || function (mod) {
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.issueCommand = void 0;
exports.prepareKeyValueMessage = exports.issueFileCommand = void 0;
// We use any as a valid input type
/* eslint-disable @typescript-eslint/no-explicit-any */
const fs = __importStar(__webpack_require__(747));
const os = __importStar(__webpack_require__(87));
const uuid_1 = __webpack_require__(62);
const utils_1 = __webpack_require__(82);
function issueCommand(command, message) {
function issueFileCommand(command, message) {
const filePath = process.env[`GITHUB_${command}`];
if (!filePath) {
throw new Error(`Unable to find environment variable for file command ${command}`);
Expand All @@ -310,7 +311,22 @@ function issueCommand(command, message) {
encoding: 'utf8'
});
}
exports.issueCommand = issueCommand;
exports.issueFileCommand = issueFileCommand;
function prepareKeyValueMessage(key, value) {
const delimiter = `ghadelimiter_${uuid_1.v4()}`;
const convertedValue = utils_1.toCommandValue(value);
// These should realistically never happen, but just in case someone finds a
// way to exploit uuid generation let's not allow keys or values that contain
// the delimiter.
if (key.includes(delimiter)) {
throw new Error(`Unexpected input: name should not contain the delimiter "${delimiter}"`);
}
if (convertedValue.includes(delimiter)) {
throw new Error(`Unexpected input: value should not contain the delimiter "${delimiter}"`);
}
return `${key}<<${delimiter}${os.EOL}${convertedValue}${os.EOL}${delimiter}`;
}
exports.prepareKeyValueMessage = prepareKeyValueMessage;
//# sourceMappingURL=file-command.js.map

/***/ }),
Expand Down Expand Up @@ -343,13 +359,7 @@ try {
}

const homeSsh = homePath + '/.ssh';

console.log(`Adding GitHub.com keys to ${homeSsh}/known_hosts`);

fs.mkdirSync(homeSsh, { recursive: true });
fs.appendFileSync(`${homeSsh}/known_hosts`, '\ngithub.com ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBEmKSENjQEezOmxkZMy7opKgwFB9nkt5YRrYMjNuG5N87uRgg6CLrbo5wAdT/y6v0mKV0U2w0WZ2YB/++Tpockg=\n');
fs.appendFileSync(`${homeSsh}/known_hosts`, '\ngithub.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOMqqnkVzrm0SdG6UOoqKLsabgH5C9okWi0dh2l9GKJl\n');
fs.appendFileSync(`${homeSsh}/known_hosts`, '\ngithub.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==\n');

console.log("Starting ssh-agent");

Expand Down Expand Up @@ -1755,7 +1765,6 @@ const file_command_1 = __webpack_require__(102);
const utils_1 = __webpack_require__(82);
const os = __importStar(__webpack_require__(87));
const path = __importStar(__webpack_require__(622));
const uuid_1 = __webpack_require__(62);
const oidc_utils_1 = __webpack_require__(742);
/**
* The code to exit an action
Expand Down Expand Up @@ -1785,20 +1794,9 @@ function exportVariable(name, val) {
process.env[name] = convertedVal;
const filePath = process.env['GITHUB_ENV'] || '';
if (filePath) {
const delimiter = `ghadelimiter_${uuid_1.v4()}`;
// These should realistically never happen, but just in case someone finds a way to exploit uuid generation let's not allow keys or values that contain the delimiter.
if (name.includes(delimiter)) {
throw new Error(`Unexpected input: name should not contain the delimiter "${delimiter}"`);
}
if (convertedVal.includes(delimiter)) {
throw new Error(`Unexpected input: value should not contain the delimiter "${delimiter}"`);
}
const commandValue = `${name}<<${delimiter}${os.EOL}${convertedVal}${os.EOL}${delimiter}`;
file_command_1.issueCommand('ENV', commandValue);
}
else {
command_1.issueCommand('set-env', { name }, convertedVal);
return file_command_1.issueFileCommand('ENV', file_command_1.prepareKeyValueMessage(name, val));
}
command_1.issueCommand('set-env', { name }, convertedVal);
}
exports.exportVariable = exportVariable;
/**
Expand All @@ -1816,7 +1814,7 @@ exports.setSecret = setSecret;
function addPath(inputPath) {
const filePath = process.env['GITHUB_PATH'] || '';
if (filePath) {
file_command_1.issueCommand('PATH', inputPath);
file_command_1.issueFileCommand('PATH', inputPath);
}
else {
command_1.issueCommand('add-path', {}, inputPath);
Expand Down Expand Up @@ -1856,7 +1854,10 @@ function getMultilineInput(name, options) {
const inputs = getInput(name, options)
.split('\n')
.filter(x => x !== '');
return inputs;
if (options && options.trimWhitespace === false) {
return inputs;
}
return inputs.map(input => input.trim());
}
exports.getMultilineInput = getMultilineInput;
/**
Expand Down Expand Up @@ -1889,8 +1890,12 @@ exports.getBooleanInput = getBooleanInput;
*/
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setOutput(name, value) {
const filePath = process.env['GITHUB_OUTPUT'] || '';
if (filePath) {
return file_command_1.issueFileCommand('OUTPUT', file_command_1.prepareKeyValueMessage(name, value));
}
process.stdout.write(os.EOL);
command_1.issueCommand('set-output', { name }, value);
command_1.issueCommand('set-output', { name }, utils_1.toCommandValue(value));
}
exports.setOutput = setOutput;
/**
Expand Down Expand Up @@ -2019,7 +2024,11 @@ exports.group = group;
*/
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function saveState(name, value) {
command_1.issueCommand('save-state', { name }, value);
const filePath = process.env['GITHUB_STATE'] || '';
if (filePath) {
return file_command_1.issueFileCommand('STATE', file_command_1.prepareKeyValueMessage(name, value));
}
command_1.issueCommand('save-state', { name }, utils_1.toCommandValue(value));
}
exports.saveState = saveState;
/**
Expand Down
6 changes: 0 additions & 6 deletions index.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -23,13 +23,7 @@ try {
}

const homeSsh = homePath + '/.ssh';

console.log(`Adding GitHub.com keys to ${homeSsh}/known_hosts`);

fs.mkdirSync(homeSsh, { recursive: true });
fs.appendFileSync(`${homeSsh}/known_hosts`, '\ngithub.com ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBEmKSENjQEezOmxkZMy7opKgwFB9nkt5YRrYMjNuG5N87uRgg6CLrbo5wAdT/y6v0mKV0U2w0WZ2YB/++Tpockg=\n');
fs.appendFileSync(`${homeSsh}/known_hosts`, '\ngithub.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOMqqnkVzrm0SdG6UOoqKLsabgH5C9okWi0dh2l9GKJl\n');
fs.appendFileSync(`${homeSsh}/known_hosts`, '\ngithub.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==\n');

console.log("Starting ssh-agent");

Expand Down

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