DenyHosts SSH attack prevention and is used by thousands of users worldwide
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server attack ssh SSH server attack prevention deny access

DenyHosts Description

SSH attack prevention and is used by thousands of users worldwide The idea of denying access to SSH servers is nothing new and I was inspired by many other scripts that I discovered. However, none of them did things the way I envisioned them to. Also, they were all shell scripts which do not offer the elegance of Python.Denyhosts provides SSH attack prevention and is used by thousands of users worldwide. Here are some key features of "DenyHosts": · Parses /var/log/secure to find all login attempts and filters failed and successful attempts. · Synchronization mode (new in 2.0) allows DenyHosts daemons the ability to share data via a centralized server to proactively thwart attacks. · Can be run from the command line, cron or as a daemon (new in 0.9) · Records all failed login attempts for the user and offending host · For each host that exceeds a threshold count, records the evil host · Keeps track of each non-existent user (eg. sdadasd) when a login attempt failed. · Keeps track of each existing user (eg. root) when a login attempt failed. · Keeps track of each offending host (with 0.8+ these hosts can be purged if the associated entry in /etc/hosts.deny is expired) · Keeps track of suspicious logins (that is, logins that were successful for a host that had many login failures) · Keeps track of the file offset, so that you can reparse the same file (/var/log/secure) continuously (until it is rotated). · When the log file is rotated, the script will detect it and parse from the beginning. · Appends /etc/hosts.deny and adds the newly banned hosts · Optionally sends an email of newly banned hosts and suspicious logins. · Keeps a history of all user, host, user/host combo and suspicious logins encountered which includes the data and number of corresponding failed login attempts. · Maintains failed valid and invalid user login attempts in separate files, such that it is easy to see which valid user is under attack (which would give you the opportunity to remove the account, change the password or change it's default shell to something like /sbin/nologin · Resolves IP addresses to hostnames, if available (new in v0.6.0). · /etc/hosts.deny entries can be expired (purge) at a user specified time (new in 0.8) · FreeBSD support (added in 0.7)

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