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ftpd: add some security checks

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Nicola Murino
2021-08-05 18:38:15 +02:00
parent 419774158a
commit a3c087456b
13 changed files with 151 additions and 41 deletions
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docs/full-configuration.md
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@@ -116,6 +116,8 @@ The configuration file contains the following sections:
- `force_passive_ip`, ip address. External IP address to expose for passive connections. Leavy empty to autodetect. If not empty, it must be a valid IPv4 address. Defaut: "".
- `client_auth_type`, integer. Set to `1` to require a client certificate and verify it. Set to `2` to request a client certificate during the TLS handshake and verify it if given, in this mode the client is allowed not to send a certificate. At least one certification authority must be defined in order to verify client certificates. If no certification authority is defined, this setting is ignored. Default: 0.
- `tls_cipher_suites`, list of strings. List of supported cipher suites for TLS version 1.2. If empty, a default list of secure cipher suites is used, with a preference order based on hardware performance. Note that TLS 1.3 ciphersuites are not configurable. The supported ciphersuites names are defined [here](https://github.com/golang/go/blob/master/src/crypto/tls/cipher_suites.go#L52). Any invalid name will be silently ignored. The order matters, the ciphers listed first will be the preferred ones. Default: empty.
- `passive_connections_security`, integer. Defines the security checks for passive data connections. Set to `0` to require matching peer IP addresses of control and data connection. Set to `1` to disable any checks. Please note that if you run the FTP service behind a proxy you must enable the proxy protocol for both control and data connections. Default: `0`.
- `active_connections_security`, integer. Defines the security checks for active data connections. The supported values are the same as described for `passive_connections_security`. Please note that disabling the security checks you will make the FTP service vulnerable to bounce attacks on active data connections, so change the default value only if you are on a trusted/internal network. Default: `0`.
- `debug`, boolean. If enabled any FTP command will be logged. This will generate a lot of logs. Enable only if you are investigating a client compatibility issue or something similar. You shouldn't leave this setting enabled for production servers. Default `false`.
- `banner`, string. Greeting banner displayed when a connection first comes in. Leave empty to use the default banner. Default `SFTPGo <version> ready`, for example `SFTPGo 1.0.0-dev ready`.
- `banner_file`, path to the banner file. The contents of the specified file, if any, are displayed when someone connects to the server. It can be a path relative to the config dir or an absolute one. If set, it overrides the banner string provided by the `banner` option. Leave empty to disable.