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[tctl] Adds option to write tarred
tctl auth sign output to stdout (#…
…29451) * Proof-of-concept writing tar to stdout A quick and dirty experiment showing one possible approach for writing certificates to stdout. Demonstrates a possible solution to #29262. DO NOT MERGE AS IS. IN NO WAY PRODUCTION READY. * Fix timestamps * Adds `--tar` option to `auth sign` Adds an option to bundle the certificates generated by `tctl auth sign` into a tarball and writes that tarball to stdout. This is to facilitate extracting credentials from environments with limited access to the filesystem and tools like a shell, tar and so on, e.g. distroless Docker images. Example usage: ``` $ kubectl exec ... -- tctl auth sign --user alice --format openssh -o alice --tar | tar xv x alice-cert.pub x alice ``` * Reroutes helper mesg to stderr when straming tar file to stdout
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| // Copyright 2023 Gravitational, Inc | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| package common | ||
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| import ( | ||
| "archive/tar" | ||
| "io" | ||
| "io/fs" | ||
| "os" | ||
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| "github.com/gravitational/trace" | ||
| "github.com/jonboulle/clockwork" | ||
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| "github.com/gravitational/teleport/lib/client/identityfile" | ||
| ) | ||
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| // tarWriter implements a ConfigWriter that generates a tarfile from the | ||
| // files written to the config writer. Does not implement | ||
| type tarWriter struct { | ||
| tarball *tar.Writer | ||
| clock clockwork.Clock | ||
| } | ||
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| // newTarWriter creates a new tarWriter that writes the generated tar | ||
| // file to the supplied `io.Writer`. Be sure to terminate the tar archive | ||
| // by calling `Close()` on the resuting `tarWriter`. | ||
| func newTarWriter(out io.Writer, clock clockwork.Clock) *tarWriter { | ||
| return &tarWriter{ | ||
| tarball: tar.NewWriter(out), | ||
| clock: clock, | ||
| } | ||
| } | ||
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| // Remove is not implemented, and only exists to fill out the | ||
| // `ConfigWriter` interface. | ||
| func (t *tarWriter) Remove(_ string) error { | ||
| return trace.NotImplemented("tarWriter.Remove()") | ||
| } | ||
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| // Stat always returns `ErrNotExist` in ordre to sidestep the | ||
| // overwite check when writing certificates via a ConfigWriter. | ||
| func (t *tarWriter) Stat(_ string) (fs.FileInfo, error) { | ||
| return nil, os.ErrNotExist | ||
| } | ||
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| // WriteFile adds the supplied content to the tar archive. | ||
| func (t *tarWriter) WriteFile(name string, content []byte, mode fs.FileMode) error { | ||
| header := &tar.Header{ | ||
| Name: name, | ||
| Mode: int64(mode), | ||
| ModTime: t.clock.Now(), | ||
| Size: int64(len(content)), | ||
| } | ||
| if err := t.tarball.WriteHeader(header); err != nil { | ||
| return trace.Wrap(err) | ||
| } | ||
| if _, err := t.tarball.Write(content); err != nil { | ||
| return trace.Wrap(err) | ||
| } | ||
| return nil | ||
| } | ||
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| // Close finalizes the tar archive, adding any necessary padding and footers. | ||
| func (t *tarWriter) Close() error { | ||
| return trace.Wrap(t.tarball.Close()) | ||
| } | ||
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| // identityfile.ConfigWriter implementation check | ||
| var _ identityfile.ConfigWriter = (*tarWriter)(nil) |
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