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ssh: refactor host key algorithm restriction
Signed-off-by: Nicola Murino <[email protected]>
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@@ -141,7 +141,7 @@ The configuration file contains the following sections: | |
| - `banner`, string. Identification string used by the server. Leave empty to use the default banner. Default `SFTPGo_<version>`, for example `SSH-2.0-SFTPGo_0.9.5` | ||
| - `host_keys`, list of strings. It contains the daemon's private host keys. Each host key can be defined as a path relative to the configuration directory or an absolute one. If empty, the daemon will search or try to generate `id_rsa`, `id_ecdsa` and `id_ed25519` keys inside the configuration directory. If you configure absolute paths to files named `id_rsa`, `id_ecdsa` and/or `id_ed25519` then SFTPGo will try to generate these keys using the default settings. | ||
| - `host_certificates`, list of strings. Public host certificates. Each certificate can be defined as a path relative to the configuration directory or an absolute one. Certificate's public key must match a private host key otherwise it will be silently ignored. Default: empty. | ||
| - `host_key_algorithms`, list of strings. Public key algorithms that the server will accept for host key authentication. The supported values are: `[email protected]`, `[email protected]`, `[email protected]`, `[email protected]`, `[email protected]`, `[email protected]`, `[email protected]`, `[email protected]`, `ecdsa-sha2-nistp256`, `ecdsa-sha2-nistp384`, `ecdsa-sha2-nistp521`, `rsa-sha2-512`, `rsa-sha2-256`, `ssh-rsa`, `ssh-dss`, `ssh-ed25519`. Default values: `rsa-sha2-512[email protected]`, `rsa-sha2-256[email protected]`, `ecdsa-sha2-nistp256[email protected]`, `ecdsa-sha2-nistp384[email protected]`, `ecdsa-sha2-nistp521[email protected]`, `[email protected]`, `ecdsa-sha2-nistp256`, `ecdsa-sha2-nistp384`, `ecdsa-sha2-nistp521`, `rsa-sha2-512`, `rsa-sha2-256`, `ssh-ed25519`. | ||
| - `host_key_algorithms`, list of strings. Public key algorithms that the server will accept for host key authentication. The supported values are: `[email protected]`, `[email protected]`, `[email protected]`, `[email protected]`, `[email protected]`, `[email protected]`, `[email protected]`, `[email protected]`, `ecdsa-sha2-nistp256`, `ecdsa-sha2-nistp384`, `ecdsa-sha2-nistp521`, `rsa-sha2-512`, `rsa-sha2-256`, `ssh-rsa`, `ssh-dss`, `ssh-ed25519`. Certificate algorithms are listed for backward compatibility purposes only, they are not used. Default values: `rsa-sha2-512`, `rsa-sha2-256`, `ecdsa-sha2-nistp256`, `ecdsa-sha2-nistp384`, `ecdsa-sha2-nistp521`, `ssh-ed25519`. | ||
| - `moduli`, list of strings. Diffie-Hellman moduli files. Each moduli file can be defined as a path relative to the configuration directory or an absolute one. If set and valid, `diffie-hellman-group-exchange-sha256` and `diffie-hellman-group-exchange-sha1` KEX algorithms will be available, `diffie-hellman-group-exchange-sha256` will be enabled by default if you don't explicitly set KEXs. Invalid moduli file will be silently ignored. Default: empty. | ||
| - `kex_algorithms`, list of strings. Available KEX (Key Exchange) algorithms in preference order. Leave empty to use default values. The supported values are: `curve25519-sha256`, `[email protected]`, `ecdh-sha2-nistp256`, `ecdh-sha2-nistp384`, `ecdh-sha2-nistp521`, `diffie-hellman-group14-sha256`, `diffie-hellman-group16-sha512`, `diffie-hellman-group14-sha1`, `diffie-hellman-group1-sha1`. Default values: `curve25519-sha256`, `[email protected]`, `ecdh-sha2-nistp256`, `ecdh-sha2-nistp384`, `ecdh-sha2-nistp521`, `diffie-hellman-group14-sha256`. SHA512 based KEXs are disabled by default because they are slow. If you set one or more moduli files, `diffie-hellman-group-exchange-sha256` and `diffie-hellman-group-exchange-sha1` will be available. | ||
| - `ciphers`, list of strings. Allowed ciphers in preference order. Leave empty to use default values. The supported values are: `[email protected]`, `[email protected]`, `[email protected]`, `aes128-ctr`, `aes192-ctr`, `aes256-ctr`, `aes128-cbc`, `aes192-cbc`, `aes256-cbc`, `3des-cbc`, `arcfour256`, `arcfour128`, `arcfour`. Default values: `[email protected]`, `[email protected]`, `[email protected]`, `aes128-ctr`, `aes192-ctr`, `aes256-ctr`. Please note that the ciphers disabled by default are insecure, you should expect that an active attacker can recover plaintext if you enable them. | ||
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