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SSH audit events and contexts #28

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Jun 29, 2023
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SSH audit events and contexts #28

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SSH audit events and contexts
beldmit Jun 27, 2023
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fixup! SSH audit events and contexts
beldmit Jun 28, 2023
a04e720
fixup! SSH audit events and contexts
beldmit Jun 28, 2023
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fixup! fixup! SSH audit events and contexts
beldmit Jun 28, 2023
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fixup! fixup! SSH audit events and contexts
beldmit Jun 28, 2023
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fixup! fixup! fixup! SSH audit events and contexts
beldmit Jun 29, 2023
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fixup! fixup! fixup! SSH audit events and contexts
beldmit Jun 29, 2023
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fixup! fixup! fixup! fixup! SSH audit events and contexts
beldmit Jun 29, 2023
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51 changes: 51 additions & 0 deletions docs/logging-format.md
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Expand Up @@ -228,6 +228,57 @@ and TLS probe points.
| `tls::key_exchange_algorithm` | uint16 | Key exchange mode: ECDHE(0), DHE(1), PSK(2), ECDHE-PSK(3), DHE-PSK(4) |
| `tls::group` | uint16 | Groups used in the handshake (as in IANA [registry][iana-tls-supported-groups]) |

##### SSH context names

| name | description |
|------------------------|----------------------------------------|
| `ssh::handshake_client`| SSH handshake for client |
| `ssh::handshake_server`| SSH handshake for server |
| `ssh::client_key` | SSH client key signature/verification |
| `ssh::server_key` | SSH server key signature/verification |
| `ssh::key_exchange` | SSH key exchange |

##### SSH keys

All the keys except `rsa_bits` have `string` type.
We distinguish server and client values by the context we are in. We log all relevant events in both contexts.

| key | description | example |
|---------------------------------|--------------------------------------------------|----------------------------|
| `ssh::ident_string` | Software identification string | `SSH-2.0-OpenSSH_8.8` |
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| `ssh::peer_ident_string` | Peer software identification string | `SSH-2.0-OpenSSH_8.8` |
| `ssh::key_algorithm` | Key used in handshake/key ownership proof | `ssh-ed25519` |
| `ssh::rsa_bits` | Key bits (RSA only) | 2048 |
| `ssh::cert_signature_algorithm` | If cert is used, signature algorithm of the cert | `ecdsa-sha2-nistp521` |
| `ssh::kex_algorithm` | Negotiated key exchange algorithm | `curve25519-sha256` |
| `ssh::kex_group` | Group used for key exchange | moduli+bits or group name. |
| `ssh::c2s_cipher` | Data cipher algorithm | `[email protected]` |
| `ssh::s2c_cipher` | | |
| `ssh::c2s_mac` | Data integrity algorithm, omitted for `implicit` | `[email protected]` |
| `ssh::s2c_mac` | | |
| `ssh::c2s_compression` | Data compression algorithm, omitted for `none` | `[email protected]` |
| `ssh::s2c_compression` | | |

##### Example of SSH context tree:

- `ssh::handshake_client`
- `ssh::ident_string` = `SSH-2.0-OpenSSH_8.8`
- `ssh::peer_ident_string` = `SSH-2.0-OpenSSH_8.8`
- `ssh::key_exchange`
- `ssh::kex_algorithm` = `curve25519-sha256`
- `ssh::key_algorithm` = `ssh-ed25519`
- `ssh::s2c_cipher` = `[email protected]`
- `ssh::c2s_cipher` = `[email protected]`
- `ssh::server_key`
- `ssh::key_algorithm` = `ssh-ed25519`
- `ssh::client_key`
- `ssh::key_algorithm` = `ssh-ed25519`
- `ssh::server_key`
- `ssh::key_algorithm` = `rsa-sha2-256`
- `ssh::rsa_bits` = 2048
- `ssh::server_key`
- `ssh::key_algorithm` = `ecdsa-sha2-nistp256`

### CBOR based logging format definition

The recommended format of storing events is to use a sequence of
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