ECS: Il blocco del nodo non riesce a causa del limitatore di velocità SSH sul nodo

Problema osservato dopo l'aggiornamento a ECS 4.0.

Lo stato del nodo viene visualizzato come "sconosciuto" o "bloccato" nell'interfaccia utente web di ECS.

Impossibile eseguire il comando di blocco della CLI.

L'accesso SSH al nodo rimane disponibile nonostante il tentativo di blocco.

Questo problema è causato dalla presenza di un limitatore di velocità SSH applicato utilizzando una regola STIG (SLES-12-030040). Questa regola non è compatibile con SLES15 e, una volta applicata, non può essere ripristinata utilizzando il framework STIG SLES12.

Il comando seguente visualizza le informazioni sul sistema operativo:

admin@node1:~> cat /etc/os-release
NAME="SLES"
VERSION="15-SP4"
VERSION_ID="15.4"
PRETTY_NAME="SUSE Linux Enterprise Server 15 SP4"
ID="sles"
ID_LIKE="suse"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:suse:sles:15:sp4"
DOCUMENTATION_URL="https://documentation.suse.com/"

Per risolvere il problema, rimuovere il limitatore di velocità SSH dal nodo o dai nodi interessati:

1. Verificare il limitatore di velocità SSH: 

admin@node1:~> sudo iptables -L | grep limit  | grep ssh
LOG        tcp  --  anywhere             anywhere             limit: avg 3/min burst 5 tcp dpt:ssh ctstate NEW recent: CHECK seconds: 60 hit_count: 3 name: ssh side: source mask: 255.255.255.255 LOG level warning tcp-options ip-options prefix "SFW2-INext-DROPr "

2. Invertire la regola STIG:

admin@node1:~> cd /opt/emc/security/hardening/root/sbin; sudo ./revert-harden -i SLES-12-030040
Changes reverted: FW_SERVICES_ACCEPT_EXT="0/0,tcp,22,,hitcount=3,blockseconds=60,recentname=ssh"
FW_SERVICES_ACCEPT_EXT="0/0,tcp,22,,hitcount=3,blockseconds=60,recentname=ssh"
Changes reverted: TCP="ssh"
Restarting SuSEfirewall2.service ...
SuSEfirewall2.service restarted successfully.
Reverted STIG ID: SLES-12-030040 on /etc/sysconfig/SuSEfirewall2.d/services/sshd successfully

3. Verificare le modifiche:

admin@node1:/opt/emc/security/hardening/root/sbin> sudo iptables -L | grep limit  | grep ssh

4. Bloccare il nodo utilizzando l'interfaccia utente web o la CLI:

admin@node1:~> sudo -i lockdown set lock
[lockdown] :Info: Suspend fabric agent firewall check
INFO: Parsing /opt/emc/nile/etc/conf/nan/emc-firewall-cfg
dev_ext: public - dev_int: private private.4 pslave-0 pslave-1
INFO: Updating /etc/sysconfig/SuSEfirewall2.d/services/emc-ecs-custom
INFO: Updating /etc/sysconfig/SuSEfirewall2
<38>Jun 25 10:34:47 SuSEfirewall2[32514]: Firewall rules unloaded.
<38>Jun 25 10:34:47 SuSEfirewall2[32594]: Setting up rules from /etc/sysconfig/SuSEfirewall2 ...
<38>Jun 25 10:34:47 SuSEfirewall2[32594]: using default zone 'ext' for interface docker0
<38>Jun 25 10:34:47 SuSEfirewall2[32594]: using default zone 'ext' for interface public_mgmt
<38>Jun 25 10:34:47 SuSEfirewall2[32594]: using default zone 'ext' for interface slave_0
<38>Jun 25 10:34:47 SuSEfirewall2[32594]: using default zone 'ext' for interface slave_1
<38>Jun 25 10:34:47 SuSEfirewall2[32594]: Firewall custom rules loaded from /opt/emc/nile/etc/conf/nan/nan_pbr_rules
<38>Jun 25 10:34:48 SuSEfirewall2[32594]: /proc/sys/net/ipv4/conf/all/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:48 SuSEfirewall2[32594]: /proc/sys/net/ipv4/conf/default/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:48 SuSEfirewall2[32594]: /proc/sys/net/ipv4/conf/docker0/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:48 SuSEfirewall2[32594]: /proc/sys/net/ipv4/conf/lo/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:48 SuSEfirewall2[32594]: /proc/sys/net/ipv4/conf/private/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:48 SuSEfirewall2[32594]: /proc/sys/net/ipv4/conf/pslave-0/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:48 SuSEfirewall2[32594]: /proc/sys/net/ipv4/conf/pslave-1/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:48 SuSEfirewall2[32594]: /proc/sys/net/ipv4/conf/public/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:48 SuSEfirewall2[32594]: /proc/sys/net/ipv4/conf/slave-0/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:49 SuSEfirewall2[32594]: /proc/sys/net/ipv4/conf/slave-1/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:49 SuSEfirewall2[32594]: Firewall rules successfully set
INFO: Updating /etc/sysconfig/SuSEfirewall2
<38>Jun 25 10:34:57 SuSEfirewall2[35003]: Firewall rules unloaded.
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: Setting up rules from /etc/sysconfig/SuSEfirewall2 ...
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: using default zone 'ext' for interface docker0
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: using default zone 'ext' for interface public_mgmt
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: using default zone 'ext' for interface slave_0
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: using default zone 'ext' for interface slave_1
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: Firewall custom rules loaded from /opt/emc/nile/etc/conf/nan/nan_pbr_rules
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: /proc/sys/net/ipv4/conf/all/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: /proc/sys/net/ipv4/conf/default/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: /proc/sys/net/ipv4/conf/docker0/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: /proc/sys/net/ipv4/conf/lo/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:57 SuSEfirewall2[35084]: /proc/sys/net/ipv4/conf/private/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:58 SuSEfirewall2[35084]: /proc/sys/net/ipv4/conf/pslave-0/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:58 SuSEfirewall2[35084]: /proc/sys/net/ipv4/conf/pslave-1/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:58 SuSEfirewall2[35084]: /proc/sys/net/ipv4/conf/public/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:58 SuSEfirewall2[35084]: /proc/sys/net/ipv4/conf/slave-0/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:58 SuSEfirewall2[35084]: /proc/sys/net/ipv4/conf/slave-1/rp_filter override in /etc/sysctl.d/70-nan-performance.conf, not setting it
<38>Jun 25 10:34:59 SuSEfirewall2[35084]: Firewall rules successfully set
locked
[lockdown] :Info: Resume fabric agent firewall check

Questa soluzione alternativa è applicabile solo ai nodi che eseguono SLES15 in cui è stato applicato in precedenza il framework STIG SLES12. Verificare la compatibilità prima di applicare o ripristinare le regole STIG.