mirror of https://github.com/prometheus/prometheus
44 lines
1.3 KiB
Markdown
44 lines
1.3 KiB
Markdown
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# rootcerts
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Functions for loading root certificates for TLS connections.
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-----
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Go's standard library `crypto/tls` provides a common mechanism for configuring
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TLS connections in `tls.Config`. The `RootCAs` field on this struct is a pool
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of certificates for the client to use as a trust store when verifying server
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certificates.
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This library contains utility functions for loading certificates destined for
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that field, as well as one other important thing:
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When the `RootCAs` field is `nil`, the standard library attempts to load the
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host's root CA set. This behavior is OS-specific, and the Darwin
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implementation contains [a bug that prevents trusted certificates from the
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System and Login keychains from being loaded][1]. This library contains
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Darwin-specific behavior that works around that bug.
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[1]: https://github.com/golang/go/issues/14514
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## Example Usage
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Here's a snippet demonstrating how this library is meant to be used:
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```go
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func httpClient() (*http.Client, error)
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tlsConfig := &tls.Config{}
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err := rootcerts.ConfigureTLS(tlsConfig, &rootcerts.Config{
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CAFile: os.Getenv("MYAPP_CAFILE"),
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CAPath: os.Getenv("MYAPP_CAPATH"),
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})
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if err != nil {
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return nil, err
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}
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c := cleanhttp.DefaultClient()
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t := cleanhttp.DefaultTransport()
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t.TLSClientConfig = tlsConfig
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c.Transport = t
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return c, nil
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}
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```
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