Match Introduces a conditional block. If all of the criteria on the Match line are satisfied, the keywords on the following lines override those set in the global section of the config file, until either another
Match line or the end of the file.
The arguments to Match are one or more criteria-pattern pairs. The available criteria are User, Group, Host, LocalAddress, LocalPort, and Address. The match patterns may consist of single entries or comma-
separated lists and may use the wildcard and negation operators described in the PATTERNS section of ssh_config(5).
The patterns in an Address criteria may additionally contain addresses to match in CIDR address/masklen format, e.g. “192.0.2.0/24” or “3ffe:ffff::/32”. Note that the mask length provided must be consistent
with the address - it is an error to specify a mask length that is too long for the address or one with bits set in this host portion of the address. For example, “192.0.2.0/33” and “192.0.2.0/8” respectively.
This means that, assuming 10.0.0.0/24 to be your LAN, you can have
PasswordAuthentication disabled in the main configuration and a
Match block like this:
Match Address 10.0.0.0/24