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aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=dismail.de header.s=20190914 header.b=jcuzMmy3; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -4.04 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=dismail.de header.s=20190914 header.b=jcuzMmy3; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 5950C22B0B X-Spam-Score: -4.04 X-Migadu-Scanner: scn0.migadu.com X-TUID: 9iz54V99UBAC From: Nicolò Balzarotti * gnu/services/ssh.scm: Add endlessh service endlessh-configuration>): New record type. (endlessh-config->conf, endlessh-shepherd-service, endlessh-service-type): New procedures. * doc/guix.texi: added documnetation for the endlessh service. --- doc/guix.texi | 60 ++++++++++++++++++++++++++++++++++++ gnu/services/ssh.scm | 73 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 133 insertions(+) diff --git a/doc/guix.texi b/doc/guix.texi index 99f8ba6c54..9a1e2801dd 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -20393,6 +20393,66 @@ may cause undefined behaviour. @end table @end deftp +@cindex Endlessh +@deffn {Scheme Variable} endlessh-service-type +This is the type for the @uref{https://github.com/skeeto/endlessh, +Endlessh} service, which is an ssh tarbit. It delays ssh clients for +days at a time by @emph{very slowly} sending a random and endless SSH +banner. The smart hacker will run endlessh on port 22, and let crackers +get stuck in this tarpit. This lets your real ssh server run more +securely on a non-standard port. + +For example: + +@lisp +(service endlessh-service-type + (endlessh-configuration + (port-number 22))) +@end lisp + +@end deffn + +@deftp {Data Type} endlessh-configuration +Data type representing the configuration for @code{endlessh-service}. +@table @asis +@item @code{package} (default: @var{endlessh}) +@code{endlessh} package to use. + +@item @code{bind-family} (default: @code{'(ipv4 ipv6)}) +This specifies if endlessh should use ipv4 and/or ipv6. + +@item @code{delay} (default: @code{10000}) +The endless banner is sent one line at a time. This is the delay +in milliseconds between individual lines. + +@item @code{length} (default: @code{32}) +The length of each line is randomized. This controls the maximum length +of each line. Shorter lines may keep clients on for longer if they give +up after a certain number of bytes. + +@item @code{max-clients} (default: @code{4096}) +Maximum number of connections to accept at a time. Connections beyond +this are not immediately rejected, but will wait in the queue. + +@item @code{port-number} (default: @code{2222}) +The port on which to listen for new SSH connections. Most users who +want to use endlessh as intended should set this port number to +@code{22}. + +@item @code{log-level} (default: @code{0}) +Set the detail level for the log. +@table @asis +@item 0 = Quiet +@item 1 = Standard, useful log messages +@item 2 = Very noisy debugging information +@end table + +@item @code{syslog} (default: @code{#f}) +Print diagnostics to syslog instead of standard output + +@end table +@end deftp + @cindex WebSSH @deffn {Scheme Variable} webssh-service-type This is the type for the @uref{https://webssh.huashengdun.org/, WebSSH} diff --git a/gnu/services/ssh.scm b/gnu/services/ssh.scm index 72e7183590..2e547b63cd 100644 --- a/gnu/services/ssh.scm +++ b/gnu/services/ssh.scm @@ -58,6 +58,10 @@ (define-module (gnu services ssh) autossh-configuration? autossh-service-type + endlessh-configuration + endlessh-configuration? + endlessh-service-type + webssh-configuration webssh-configuration? webssh-service-type @@ -802,6 +806,75 @@ (define autossh-service-type autossh-service-activation))) (default-value (autossh-configuration)))) + +;;; +;;; Endlessh. +;;; + +(define-record-type* + endlessh-configuration make-endlessh-configuration + endlessh-configuration? + ;; list of two symbols, allowed values are ipv4, ipv6 or both + (bind-family endlessh-configuration-bind-family (default '(ipv4 ipv6))) + ;; integer + (delay endlessh-configuration-delay (default 10000)) + ;; integer + ;; Must be in the range + (length endlessh-configuration-length (default 32)) + ;; integer + (max-clients endlessh-configuration-max-clients (default 4096)) + ;; integer + (port-number endlessh-configuration-port-number (default 2222)) + ;; integer + ;; Allowed values are 0, 1 and 2 + (log-level endlessh-configuration-log-level (default 0))) + +(define (endlessh-config->conf config) + "Convert the CONFIG of type to a config file." + (let* ((family (endlessh-configuration-bind-family config)) + (ipv4 (member 'ipv4 family)) + (ipv6 (member 'ipv6 family)) + (port (endlessh-configuration-port-number config)) + (delay (endlessh-configuration-delay config)) + (length (endlessh-configuration-length config)) + (log-level (endlessh-configuration-log-level config)) + (max-clients (endlessh-configuration-max-clients config)) + (bind + ;; check if both are true (0), or only one of them is present + (if (not (and (equal? ipv4 ipv6) ipv4)) + (if ipv4 4 + (if ipv6 6 + (throw 'endlessh-error + "bind-family must contain at least one value"))) + 0))) + (mixed-text-file "endlessh.conf" + "# Generated by 'endlessh-config'.\n\n" + "Port " (number->string port) "\n" + "Delay " (number->string delay) "\n" + "MaxLineLength " (number->string length) "\n" + "MaxClients " (number->string max-clients) "\n" + "LogLevel " (number->string log-level) "\n" + "BindFamily " (number->string bind) "\n"))) + +(define (endlessh-shepherd-service config) + (shepherd-service + (documentation "Run endlessh tarpit server.") + (provision '(endlessh)) + (start #~(make-forkexec-constructor + (list #$(file-append endlessh "/bin/endlessh") + "-f" #$(endlessh-config->conf config)))) + (stop #~(make-kill-destructor)))) + +(define endlessh-service-type + (service-type + (name 'endlessh) + (description "Run endlessh tarpit server.") + (extensions + (list (service-extension shepherd-root-service-type + (compose list endlessh-shepherd-service)))) + (default-value (endlessh-configuration)))) + + ;;; ;;; WebSSH -- 2.37.3