SmokePing 2.7.3 needs an update to use the SSH probe on Debian Buster.
SmokePing stopped working for me on Debian Buster.
SmokePing version.
$ smokeping -V
2.007003
$ apt-cache policy smokeping
smokeping:
Installed: 2.7.3-2
Candidate: 2.7.3-2
Version table:
*** 2.7.3-2 500
500 http://deb.debian.org/debian buster/main amd64 Packages
100 /var/lib/dpkg/status
Operating system version.
$ lsb_release -a
No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 10 (buster) Release: 10 Codename: buster
It looks like the openssh-client does not support old key types.
$ sudo smokeping --debug
ERROR: output of '/usr/bin/ssh-keyscan -t dsa,rsa,rsa1 127.0.0.1' does not match (?^i:^# \S+ SSH-) at (eval 59) line 1.
$ /usr/bin/ssh-keyscan -t dsa,rsa,rsa1 127.0.0.1
Unknown key type "rsa1"
The solution is to download and install a patch from the upstream.
From 62ac9fda04b994bbf4f97d3dd1cf8b92cf279e71 Mon Sep 17 00:00:00 2001
From: "Avinash H. Duduskar" <strykar@hotmail.com>
Date: Mon, 11 Mar 2019 13:16:13 +0530
Subject: [PATCH] Update SSH.pm to drop SSHv1 rsa1
- Removes rsa1
- Adds ecdsa instead
https://github.com/oetiker/SmokePing/issues/120
---
lib/Smokeping/probes/SSH.pm | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/lib/Smokeping/probes/SSH.pm b/lib/Smokeping/probes/SSH.pm
index ffbb5cc2..f21f53e8 100644
--- a/lib/Smokeping/probes/SSH.pm
+++ b/lib/Smokeping/probes/SSH.pm
@@ -55,7 +55,7 @@ sub new($$$)
# no need for this if we run as a cgi
unless ( $ENV{SERVER_SOFTWARE} ) {
- my $call = "$self->{properties}{binary} -t dsa,rsa,rsa1 127.0.0.1";
+ my $call = "$self->{properties}{binary} -t dsa,rsa,ecdsa 127.0.0.1";
my $return = `$call 2>&1`;
if ($return =~ m/$ssh_re/s){
print "### parsing ssh-keyscan output...OK\n";
@@ -132,7 +132,7 @@ sub targetvars {
return $class->_makevars($class->SUPER::targetvars, {
keytype => {
_doc => "Type of key, used in ssh-keyscan -t I<keytype>",
- _re => "[dr]sa1*",
+ _re => "[ecdr]sa*",
_example => 'dsa',
_default => 'rsa',
},
Install patch utility.
$ sudo apt install patch
Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: ed diffutils-doc The following NEW packages will be installed: patch 0 upgraded, 1 newly installed, 0 to remove and 1 not upgraded. Need to get 126 kB of archives. After this operation, 249 kB of additional disk space will be used. Get:1 http://deb.debian.org/debian buster/main amd64 patch amd64 2.7.6-3+deb10u1 [126 kB] Fetched 126 kB in 0s (414 kB/s) Selecting previously unselected package patch. (Reading database ... 35823 files and directories currently installed.) Preparing to unpack .../patch_2.7.6-3+deb10u1_amd64.deb ... Unpacking patch (2.7.6-3+deb10u1) ... Setting up patch (2.7.6-3+deb10u1) ... Processing triggers for man-db (2.8.5-2) ...
Change the working directory to /usr/share/perl5/.
$ cd /usr/share/perl5/
Inspect what would happen.
/usr/share/perl5$ patch --dry-run -p2 < ~/smokeping.patch
File Smokeping/probes/SSH.pm is read-only; trying to patch anyway checking file Smokeping/probes/SSH.pm Hunk #2 succeeded at 130 (offset -2 lines).
Apply patch.
/usr/share/perl5$ sudo patch -p2 < ~/smokeping.patch
patching file Smokeping/probes/SSH.pm Hunk #2 succeeded at 130 (offset -2 lines).
SmokePing will start working as expected.
$ sudo smokeping --debug ### parsing ssh-keyscan output...OK ### parsing dig output...OK ### Compiling alert detector pattern 'lossdetect' ### ==0%,==0%,==0%,==0%,==0%,>0%,>0%,>0% [...] Smokeping version 2.007003 successfully launched. Not entering multiprocess mode with '--debug'. Use '--debug-daemon' for that. DNS: probing 3 targets with step 300 s and offset 97 s. Curl: probing 2 targets with step 300 s and offset 97 s. FPing: probing 2 targets with step 300 s and offset 97 s. SSH: probing 1 targets with step 300 s and offset 97 s. [...]
Done.