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[Elastic Agent] Support custom certificate authorities #19504

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pebrc opened this issue Jun 30, 2020 · 7 comments
Closed

[Elastic Agent] Support custom certificate authorities #19504

pebrc opened this issue Jun 30, 2020 · 7 comments
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@pebrc
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pebrc commented Jun 30, 2020

Consider: Agent runs in managed mode and the Kibana instance it is connecting to is configured with a custom certificate authority that is not globally trusted in order to connect to Elasticsearch.

IIUC the agent config that is shipped to the Agent from Kibana does not include that custom certificate authority setup and the certificate authority certs are also not shipped as assets to the agent. I believe the programs relying on the output configuration will in that case just fail to connect to Elasticsearch.

In order to make it work any referenced assets from the configuration would need to be shipped to the agent as well.

For example ECK uses custom certificate authorities for Elasticsearch and Kibana to run with a secure configuration by default if a user has not yet set up their own certificates.

@elasticmachine
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Pinging @elastic/ingest-management (Team:Ingest Management)

@ph
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ph commented Jul 1, 2020

My original idea, would have be similar as your proposal but for each output and integration, maybe we have a cert store at the agent level and we can reference them.

Would be nice to hear @scunningham opinion concerning security on this.

WDYT @blakerouse @nchaulet?

@scunningham
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Delivering a custom CA Cert(s) per ES output would work.

If a CA is provided, should the agent (beat) only trust connections where the peer is signed with this cert, or should it also trust installed CA's in addition to the configured cert. I would say the former; fallback to installed CA's would not be expected by the customer.

I would imagine this would require support in each of the beats and the elastic security agent; to my knowledge each are talking directly to elastic search and not routing through the agent.

@ph
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ph commented Jul 1, 2020

@scunningham we could deliver the CA (embedded) in the configuration so that would require minimal changes into the beats?

@scunningham
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I figured it would come through the configuration. That makes it very flexible. Would need some UX treatment.

@blakerouse
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I agree, being that we are already sending the password to Elastic Agent in the configuration, no reason to do anything different for a CA.

I think the issue at the moment is that the CA settings in filebeat and metricbeat only accept a filepath to a CA and not the data directly. That would need to be added to libbeat tlscommon.Config to accept the CA data, instead of just a filepath.

ph added a commit to ph/beats that referenced this issue Sep 24, 2020
This PR allow to embed Certificate authorities directly in the yaml
configuration. This is useful in the context of fleet where distributing
file to the remote host is not possible. The format of the string need
to be in PEM.

Example: Certificate Authorities
```yaml
enabled: true
verification_mode: null
certificate: null
key: null
key_passphrase: null
certificate_authorities:
  - |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
    MjgxOTI5MDRaMBQxEjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEB
    BQADggEPADCCAQoCggEBANce58Y/JykI58iyOXpxGfw0/gMvF0hUQAcUrSMxEO6n
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    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----
cipher_suites: null
curve_types: null
supported_protocols: null
```

```Certificate and Key
enabled: true
verification_mode: null
certificate: |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
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    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----
key: |
    -----BEGIN PRIVATE KEY-----
    MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDXHufGPycpCOfI
    sjl6cRn8NP4DLxdIVEAHFK0jMRDup32UQOPW+DleEsFpgN9/ebi9ngdjQfMvKnUP
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    nygO9KTJuUiBrLr0AHEnqko=
    -----END PRIVATE KEY-----
key_passphrase: null
certificate_authorities:
cipher_suites: null
curve_types: null
supported_protocols: null
```

Related to: elastic#19504
ph added a commit that referenced this issue Sep 28, 2020
* [Elastic Agent] Allow embedding of certificate

This PR allow to embed Certificate authorities directly in the yaml
configuration. This is useful in the context of fleet where distributing
file to the remote host is not possible. The format of the string need
to be in PEM.

Example: Certificate Authorities
```yaml
enabled: true
verification_mode: null
certificate: null
key: null
key_passphrase: null
certificate_authorities:
  - |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
    MjgxOTI5MDRaMBQxEjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEB
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    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----
cipher_suites: null
curve_types: null
supported_protocols: null
```

```Certificate and Key
enabled: true
verification_mode: null
certificate: |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
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    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----
key: |
    -----BEGIN PRIVATE KEY-----
    MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDXHufGPycpCOfI
    sjl6cRn8NP4DLxdIVEAHFK0jMRDup32UQOPW+DleEsFpgN9/ebi9ngdjQfMvKnUP
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    nygO9KTJuUiBrLr0AHEnqko=
    -----END PRIVATE KEY-----
key_passphrase: null
certificate_authorities:
cipher_suites: null
curve_types: null
supported_protocols: null
```

Related to: #19504
ph added a commit to ph/beats that referenced this issue Sep 28, 2020
* [Elastic Agent] Allow embedding of certificate

This PR allow to embed Certificate authorities directly in the yaml
configuration. This is useful in the context of fleet where distributing
file to the remote host is not possible. The format of the string need
to be in PEM.

Example: Certificate Authorities
```yaml
enabled: true
verification_mode: null
certificate: null
key: null
key_passphrase: null
certificate_authorities:
  - |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
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    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----
cipher_suites: null
curve_types: null
supported_protocols: null
```

```Certificate and Key
enabled: true
verification_mode: null
certificate: |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
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    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----
key: |
    -----BEGIN PRIVATE KEY-----
    MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDXHufGPycpCOfI
    sjl6cRn8NP4DLxdIVEAHFK0jMRDup32UQOPW+DleEsFpgN9/ebi9ngdjQfMvKnUP
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    -----END PRIVATE KEY-----
key_passphrase: null
certificate_authorities:
cipher_suites: null
curve_types: null
supported_protocols: null
```

Related to: elastic#19504

(cherry picked from commit 3f017df)
ph added a commit that referenced this issue Sep 29, 2020
* [Elastic Agent] Allow embedding of certificate

This PR allow to embed Certificate authorities directly in the yaml
configuration. This is useful in the context of fleet where distributing
file to the remote host is not possible. The format of the string need
to be in PEM.

Example: Certificate Authorities
```yaml
enabled: true
verification_mode: null
certificate: null
key: null
key_passphrase: null
certificate_authorities:
  - |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
    MjgxOTI5MDRaMBQxEjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEB
    BQADggEPADCCAQoCggEBANce58Y/JykI58iyOXpxGfw0/gMvF0hUQAcUrSMxEO6n
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    8G+DZ3TUDYxqMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBAG5D
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    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----
cipher_suites: null
curve_types: null
supported_protocols: null
```

```Certificate and Key
enabled: true
verification_mode: null
certificate: |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
    MjgxOTI5MDRaMBQxEjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEB
    BQADggEPADCCAQoCggEBANce58Y/JykI58iyOXpxGfw0/gMvF0hUQAcUrSMxEO6n
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    PsvZStEVEimjvK5NSESEQa9xWyJOmlOKXhkdymtcUd/nXnx6UTCFgnkgzSdTWV41
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    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----
key: |
    -----BEGIN PRIVATE KEY-----
    MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDXHufGPycpCOfI
    sjl6cRn8NP4DLxdIVEAHFK0jMRDup32UQOPW+DleEsFpgN9/ebi9ngdjQfMvKnUP
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    nygO9KTJuUiBrLr0AHEnqko=
    -----END PRIVATE KEY-----
key_passphrase: null
certificate_authorities:
cipher_suites: null
curve_types: null
supported_protocols: null
```

Related to: #19504

(cherry picked from commit 3f017df)
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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

@botelastic botelastic bot added the Stalled label Jun 1, 2021
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