NetWorker: E-postvarsler slutter å fungere på Red Hat 8-serveren etter oppgradering til 19.10

• NetWorker-serveren er installert på Red Hat 8:

root@nwserver:~# cat /etc/redhat-release
Red Hat Enterprise Linux release 8.9 (Ootpa)

• NetWorker 19.10 ble installert på Red Hat 8.x-systemet. Dette kan være en ny installasjon eller en oppgradering fra en tidligere NetWorker-versjon.
• NetWorker Protection Policy-ressurser ble konfigurert ved hjelp av Linux mail eller mailx kommando:

• Før du oppgraderte NetWorker, ble e-postvarsler mottatt uten problemer.
• Sending av e-postmeldinger fra NetWorker-serverens kommandolinje mottas også:

root@nwserver:~# mailx -s "test email" backupadmin@domain.com < /dev/null
Null message body; hope that's ok

root@nwserver:~# tail -n 7 /var/log/maillog
Feb 14 16:13:49 nwserver sendmail[24024]: 41ELDnaE024024: from=root, size=229, class=0, nrcpts=1, msgid=<202402142113.41ELDnaE024024@nwserver.amer.lan>, relay=root@localhost
Feb 14 16:13:49 nwserver sendmail[24024]: STARTTLS=client, relay=[127.0.0.1], version=TLSv1.3, verify=FAIL, cipher=TLS_AES_256_GCM_SHA384, bits=256/256
Feb 14 16:13:49 nwserver sendmail[24025]: STARTTLS=server, relay=localhost [127.0.0.1], version=TLSv1.3, verify=NOT, cipher=TLS_AES_256_GCM_SHA384, bits=256/256
Feb 14 16:13:49 nwserver sendmail[24025]: 41ELDn4l024025: from=<root@nwserver.amer.lan>, size=490, class=0, nrcpts=1, msgid=<202402142113.41ELDnaE024024@nwserver.amer.lan>, proto=ESMTPS, daemon=MTA, relay=localhost [127.0.0.1]
Feb 14 16:13:49 nwserver sendmail[24024]: 41ELDnaE024024: to=backupadmin@domain.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30229, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (41ELDn4l024025 Message accepted for delivery)
Feb 14 16:13:50 nwserver sendmail[24027]: STARTTLS=client, relay=mailhub.domain.com., version=TLSv1.2, verify=OK, cipher=ECDHE-RSA-AES256-GCM-SHA384, bits=256/256
Feb 14 16:13:50 nwserver sendmail[24027]: 41ELDn4l024025: to=<backupadmin@domain.com>, ctladdr=<root@nwserver.amer.lan> (0/0), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=120490, relay=mailhub.domain.com. [10.10.10.10], dsn=2.0.0, stat=Sent (ok:  Message 225328373 accepted)

• Arbeidsflytloggene under /nsr/logs/policy/POLICY_NAME/ Rapporter følgende feil:

root@nwserver:~# nsr_render_log /nsr/logs/policy/Server\ Protection/workflow_Server\ backup_064001.raw
133550 02/14/2024 11:01:35 AM  1 0 0 3269973824 446260 0 nwserver.amer.lan nsrworkflow NSR notice Starting Protection Policy 'Server Protection' workflow 'Server backup'.
199800 02/14/2024 11:01:35 AM  1 5 0 3269973824 446260 0 nwserver.amer.lan nsrworkflow NSR notice Consider starting action 'Server db backup', enabled 1, schedule action '1'
204318 02/14/2024 11:01:35 AM  1 1 0 3269973824 446260 0 nwserver.amer.lan nsrworkflow SYSTEM notice Request to run the enabled action 'Server db backup' that has level configured as '1'.
201496 02/14/2024 11:01:35 AM  1 1 0 3269973824 446260 0 nwserver.amer.lan nsrworkflow SYSTEM notice Starting the scheduled action 'Server db backup'.
123316 02/14/2024 11:01:35 AM  1 0 0 3269973824 446260 0 nwserver.amer.lan nsrworkflow NSR notice Starting action 'Server Protection/Server backup/Server db backup' with command: 'nsrdbsave -l 1'.
123321 02/14/2024 11:01:35 AM  1 0 0 3269973824 446260 0 nwserver.amer.lan nsrworkflow NSR notice Action 'Server Protection/Server backup/Server db backup's log will be in '/nsr/logs/policy/Server Protection/Server backup/Server db backup_064002.raw'.
123325 02/14/2024 11:02:25 AM  1 0 0 3269973824 446260 0 nwserver.amer.lan nsrworkflow NSR notice Action 'Server Protection/Server backup/Server db backup' succeeded.
199800 02/14/2024 11:02:25 AM  1 5 0 3269973824 446260 0 nwserver.amer.lan nsrworkflow NSR notice Consider starting action 'Expiration', enabled 1, schedule action 'exec'
204318 02/14/2024 11:02:25 AM  1 1 0 3269973824 446260 0 nwserver.amer.lan nsrworkflow SYSTEM notice Request to run the enabled action 'Expiration' that has level configured as 'exec'.
201496 02/14/2024 11:02:25 AM  1 1 0 3269973824 446260 0 nwserver.amer.lan nsrworkflow SYSTEM notice Starting the scheduled action 'Expiration'.
5 02/14/2024 11:02:25 AM  1 1 0 0 unknown unknown LOG unrendered /bin/mailx: symbol lookup error: /bin/mailx: undefined symbol: SSLv3_client_method, version OPENSSL_1_1_0

En av forbedringene som gikk inn i NetWorker 19.10 var angående SSL. NetWorker tilbyr sitt eget SSL-bibliotek som eksporteres i networkerrc fil:

root@nwserver:~# cat /opt/nsr/admin/networkerrc | grep "NSR_LIBS\|LD_LIBRARY_PATH"
        NSR_LIBS=/usr/lib/nsr
        NSR_LIBS=/usr/lib/nsr/lib64
        # It must be the first entry of LD_LIBRARY_PATH otherwise it fails to load libraries.
        NSR_LIBS=/usr/lib/nsr/lib64/cst:/usr/lib/nsr/lib64
LD_LIBRARY_PATH=${NSR_LIBS}:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH

Versjonen av e-post på Red Hat 8.x inkluderer et SSL-bibliotek som inkluderer SSv3:

root@nwserver:~# ldd /bin/mail | grep ssl
        libssl.so.1.1 => /lib64/libssl.so.1.1 (0x00007f116357b000)

root@lnx-client02:~# nm -D /lib64/libssl.so.1.1 | egrep -i "SSLv3_"
0000000000022780 T SSLv3_client_method
0000000000022760 T SSLv3_method
0000000000022770 T SSLv3_server_method
root@nwserver:~# 

NetWorker 19.10 fjernet SSLv3 fra biblioteket sitt, da det er et potensielt sikkerhetsproblem og kan utnyttes:

root@nwserver:~# nm -D /usr/lib/nsr/lib64/libssl.so.1.1 | egrep -i "SSLv"
root@nwserver:~# 

Postpakken bruker en gammel libssl bibliotek. Problemet er med postpakken; dermed utenfor NetWorker.

Alternativ 1:

Utvekslings- eller e-postadministratoren kan se gjennom konfigurasjonen av e-postservere og sjekke om alternativer er tilgjengelige for å deaktivere SSLv3 til fordel for TLS 1.2.

Alternativ 2:

En løsning for dette må utgis i Linux mail eller mailx pakke. E-posten må oppdateres for å inkludere en libssl som ikke bruker SSLv3. I skrivende stund er den eneste postpakken som er oppført for Red Hat 8.x mailx-12.5-29.el8.x86_64 som ble utgitt i 2019. Dette problemet påvirker denne e-postpakken. 

Bekreft e-postpakken som er installert:

rpm -qa | grep mail

root@nwserver:~# rpm -qa | grep mail
sendmail-8.15.2-34.el8.x86_64
mailcap-2.1.48-3.el8.noarch
mailx-12.5-29.el8.x86_64
procmail-3.22-47.el8.x86_64

Få informasjon om e-postpakken ved å kjøre: 

yum provides mail

root@nwserver:~# yum provides mail
Updating Subscription Management repositories.
Last metadata expiration check: 1:55:22 ago on Wed 21 Feb 2024 09:35:43 AM EST.
mailx-12.5-29.el8.x86_64 : Enhanced implementation of the mailx command
Repo        : @System
Matched from:
Filename    : /bin/mail

mailx-12.5-29.el8.x86_64 : Enhanced implementation of the mailx command
Repo        : rhel-8-for-x86_64-baseos-rpms
Matched from:
Filename    : /bin/mail

yum upgrade mailx

Omgåelse av problemet:

1. Oppdater /opt/nsr/admin/networkerrc å inneholde OS_LIBS=/lib64 in the NetWorker environment variable LD_LIBRARY_PATH. Eksempel:  

linux86w)
        # cst path is required to locate dynamic libraries of cst (also loads internal bsafe crypto libraries).
        # It must be the first entry of LD_LIBRARY_PATH otherwise it fails to load libraries.
        # cst comes with own bsafe library. cst bsafe library version may or may not be the same
        # version of bsafe library used by other components in the product.
        NSR_LIBS=/usr/lib/nsr/lib64/cst:/usr/lib/nsr/lib64
        OS_LIBS=/lib64    
        ERLCOOKIE_HOME=/nsr/rabbitmq
        :::::::
esac

LD_LIBRARY_PATH=${OS_LIBS}:${NSR_LIBS}:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH

2. Start NetWorker på nytt:

systemctl restart networker

På Red Hat 9.x, en annen pakke gir mail / mailx som bruker en nyere libssl bibliotek. Dette nyere biblioteket bruker ikke SSLv3. Problemet er ikke reproduserbart, og det var ikke nødvendig med en løsning med NetWorker 19.10 på Red Hat 9.x.

root@lnx-nwserv:~# ldd /usr/bin/mail
        linux-vdso.so.1 (0x00007fffb211a000)
        libssl.so.3 => /lib64/libssl.so.3 (0x00007fad91b73000)
        libcrypto.so.3 => /lib64/libcrypto.so.3 (0x00007fad91600000)
        libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007fad91b1c000)
        libidn2.so.0 => /lib64/libidn2.so.0 (0x00007fad91afb000)
        libtinfo.so.6 => /lib64/libtinfo.so.6 (0x00007fad91acb000)
        libc.so.6 => /lib64/libc.so.6 (0x00007fad91200000)
        libz.so.1 => /lib64/libz.so.1 (0x00007fad91aaf000)
        libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007fad91525000)
        libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007fad91a96000)
        libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007fad91a8f000)
        libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007fad91a7e000)
        libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007fad91a77000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x00007fad91a61000)
        libunistring.so.2 => /lib64/libunistring.so.2 (0x00007fad9107b000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fad91d2e000)
        libselinux.so.1 => /lib64/libselinux.so.1 (0x00007fad91a34000)
        libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007fad91489000)

root@lnx-nwserv:~# nm -D /lib64/libssl.so.3 | egrep -i "SSLv3_" 
root@lnx-nwserv:~#

Se Dell-artikkelen: NetWorker: Nsrworkflow NSR severe Kan ikke oppgi filen /usr/bin/mail (du må logge på Dell Support som registrert kunde for å lese denne artikkelen)