Tujuan dari posting ini adalah untuk menjelaskan cara mengkonfigurasi server rsyslog untuk mengirimkan log melalui SSL/TLS. Log yang dikirimkan dari klien ke server rsyslog akan dienkripsi melalui n/w sehingga kami memiliki tingkat keamanan tambahan.
Ringkasan Prosedur
- Karena kita perlu membangun kepercayaan antara klien/server, kita perlu membuat sertifikat CA untuk setiap server/klien.
- Kami akan menyalin sertifikat klien masing-masing ke node klien dan sertifikat server ke server rsyslog.
- Server Otoritas Sertifikat dapat berupa server rsyslog atau server lain.
- Untuk menerima log melalui tls, kami akan menambahkan beberapa modul lagi ke file konfigurasi server rsyslog.
- Untuk mengirim log melalui tls, kami akan menambahkan beberapa modul lagi ke file konfigurasi klien rsyslog.
- Pastikan urutan modul sudah benar di kedua file konfigurasi server/klien.
Persyaratan
rsyslog server/client dengan paket di bawah ini:
rsyslog-gnutls-5.8.10-10.0.1.el6_6.x86_64 rsyslog-5.8.10-10.0.1.el6_6.x86_64 gnutls-utils-2.8.5-19.el6_7.x86_64 gnutls-2.8.5-19.el6_7.x86_64
Kasus Uji
1. Buat sertifikat CA di server RSyslog atau server CA lainnya.
# certtool --generate-privkey --outfile ca-key.pem Generating a 2048 bit RSA private key...
# certtool --generate-self-signed --load-privkey ca-key.pem --outfile ca.pem ===>>> generating CA certificate Generating a self signed certificate... Please enter the details of the certificate's distinguished name. Just press enter to ignore a field. Country name (2 chars): ind Organization name: Myorg Organizational unit name: myBU Locality name: BLR State or province name: KA Common name: CAcert UID: This field should not be used in new certificates. E-mail: Enter the certificate's serial number in decimal (default: 1482511911): Activation/Expiration time. The certificate will expire in (days): 3650 Extensions. Does the certificate belong to an authority? (y/N): y Path length constraint (decimal, -1 for no constraint): Is this a TLS web client certificate? (y/N): Is this also a TLS web server certificate? (y/N): Enter the e-mail of the subject of the certificate: Will the certificate be used to sign other certificates? (y/N): y Will the certificate be used to sign CRLs? (y/N): Will the certificate be used to sign code? (y/N): Will the certificate be used to sign OCSP requests? (y/N): Will the certificate be used for time stamping? (y/N): Enter the URI of the CRL distribution point: X.509 Certificate Information: Version: 3 Serial Number (hex): 585d5627 Validity: Not Before: Fri Dec 23 16:51:52 UTC 2016 Not After: Mon Dec 21 16:51:55 UTC 2026 Subject: C=ind,O=Myorg,OU=myBU,L=BLR,ST=KA,CN=CAcert Subject Public Key Algorithm: RSA Modulus (bits 2048): c0:78:d2:ba:a0:93:7d:81:a3:f7:a5:f4:86:a4:c2:2d c6:1c:c1:d2:95:c9:d5:5b:40:f9:15:a2:06:3e:f2:fa 09:f6:87:fe:36:cf:6f:85:75:ec:a1:f6:98:c7:e1:5d 7a:de:d5:a5:da:34:c7:5a:b5:f3:f2:80:a5:b8:fe:66 f3:b0:25:05:74:d3:7e:f0:45:3d:65:0a:f1:1f:5d:14 01:74:ef:9c:5f:48:b6:4b:b2:62:c5:e5:b0:21:41:92 86:bb:43:0f:2c:4a:ba:ef:1e:69:85:de:ce:42:3e:55 2c:1d:f8:82:d8:77:6a:46:ec:ac:73:b7:b3:e8:53:c4 6e:13:eb:da:27:ba:7d:70:0f:62:d5:04:b7:f7:2e:c9 57:5d:1e:0d:c2:14:8b:81:ff:9f:63:b8:4e:c9:b6:ae ad:8c:e5:eb:c1:77:70:f6:9c:90:0d:f1:9c:16:85:b3 d8:1d:70:00:82:aa:ea:1b:f4:65:a1:e7:b7:33:4a:07 46:46:e4:45:d7:3f:72:63:43:00:1b:c2:8a:d5:a2:aa 13:7f:28:b7:00:50:1d:9b:28:92:60:a7:b1:ba:3c:7b 58:e7:8b:85:ba:8c:10:da:13:28:56:f2:9c:26:70:7f cb:fb:81:4d:05:2d:0f:93:21:20:d7:75:5f:27:86:13 Exponent (bits 24): 01:00:01 Extensions: Basic Constraints (critical): Certificate Authority (CA): TRUE Key Usage (critical): Certificate signing. Subject Key Identifier (not critical): b606f5fa9bcd986ec25d2496c7d3a5c9270cc5f7 Other Information: Public Key Id: b606f5fa9bcd986ec25d2496c7d3a5c9270cc5f7 Is the above information ok? (Y/N): y Signing certificate...
# certtool --generate-privkey --outfile rslclient-key.pem --bits 2048 Generating a 2048 bit RSA private key...
# certtool --generate-request --load-privkey rslclient-key.pem --outfile request.pem Generating a PKCS #10 certificate request... Country name (2 chars): ind Organization name: Myorg Organizational unit name: Mybu Locality name: blr State or province name: KA Common name: dhcp-blr-kmgm-blk2-4fl-6fl-10-178-22-154.in.oracle.com UID: Enter a dnsName of the subject of the certificate: dhcp-blr-kmgm-blk2-4fl-6fl-10-178-22-154.in.oracle.com Enter a dnsName of the subject of the certificate: Enter the IP address of the subject of the certificate: Enter the e-mail of the subject of the certificate: Enter a challenge password: Does the certificate belong to an authority? (y/N): n Will the certificate be used for signing (DHE and RSA-EXPORT ciphersuites)? (y/N): Will the certificate be used for encryption (RSA ciphersuites)? (y/N): Is this a TLS web client certificate? (y/N): y Is this also a TLS web server certificate? (y/N): y
# certtool --generate-certificate --load-request request.pem --outfilerslclient-cert.pem --load-ca-certificate ca.pem --load-ca-privkey ca-key.pem =======>>> generating client key certificate Generating a signed certificate... Enter the certificate's serial number in decimal (default: 1482512116): Activation/Expiration time. The certificate will expire in (days): 3650 Extensions. Do you want to honour the extensions from the request? (y/N): Does the certificate belong to an authority? (y/N): n Is this a TLS web client certificate? (y/N): y Is this also a TLS web server certificate? (y/N): y Enter a dnsName of the subject of the certificate: dhcp-blr-kmgm-blk2-4fl-6fl-10-178-22-154.in.oracle.com Enter a dnsName of the subject of the certificate: Enter the IP address of the subject of the certificate: Will the certificate be used for signing (DHE and RSA-EXPORT ciphersuites)? (y/N): Will the certificate be used for encryption (RSA ciphersuites)? (y/N): X.509 Certificate Information: Version: 3 Serial Number (hex): 585d56f4 Validity: Not Before: Fri Dec 23 16:55:18 UTC 2016 Not After: Mon Dec 21 16:55:20 UTC 2026 Subject: C=ind,O=Myorg,OU=Mybu,L=blr,ST=KA,CN=dhcp-blr-kmgm-blk2-4fl-6fl-10-178-22-154.in.oracle.com Subject Public Key Algorithm: RSA Modulus (bits 2048): 9f:07:cd:0b:46:04:cd:60:be:52:43:86:3e:28:61:0e 54:6d:4b:bd:a1:31:7d:b3:4b:33:c0:b1:92:54:5d:b5 b5:67:ba:67:3f:d5:7f:5a:5a:e6:ba:71:dc:c9:4e:a3 f6:60:14:e1:60:cf:df:c1:c2:46:42:05:54:80:c1:a0 98:7e:c1:02:3b:8e:1e:0a:da:87:86:12:51:d6:db:91 3e:df:c5:32:4c:b2:fc:f8:74:fd:f1:91:89:d3:4e:8b 4a:27:bb:13:73:b3:cf:24:b6:c7:73:ad:47:58:d2:04 22:1d:af:d0:e3:be:7c:d4:85:67:ff:fd:61:55:c5:48 9d:0d:ff:aa:f0:78:78:5b:ef:14:12:f0:e4:53:84:cf b9:62:1d:20:a2:22:40:ae:9e:15:41:9b:a2:55:f3:6a 00:fe:66:8e:01:af:31:52:80:54:37:af:14:91:e8:49 d1:08:2c:24:21:74:cf:11:e3:30:5e:e4:b7:ce:0d:dc 6a:1a:16:76:8a:0f:bc:c1:37:e3:30:0f:af:29:ca:ff ac:eb:ed:dd:72:28:0a:6f:ea:58:35:67:0d:2a:57:ff af:54:61:fc:52:8f:53:7c:f9:8d:5d:2c:a9:24:60:2c c1:13:59:24:da:df:93:9a:0f:fd:74:b0:db:81:d5:17 Exponent (bits 24): 01:00:01 Extensions: Basic Constraints (critical): Certificate Authority (CA): FALSE Key Purpose (not critical): TLS WWW Client. TLS WWW Server. Subject Alternative Name (not critical): DNSname: dhcp-blr-kmgm-blk2-4fl-6fl-10-178-22-154.in.oracle.com Subject Key Identifier (not critical): 34e95fc3db224ce9b4ed05f619359a4c4140826e Authority Key Identifier (not critical): b606f5fa9bcd986ec25d2496c7d3a5c9270cc5f7 Other Information: Public Key Id: 34e95fc3db224ce9b4ed05f619359a4c4140826e Is the above information ok? (Y/N): y Signing certificate...
# rm -rf request.pem
– Hasilkan sertifikat untuk server:
# certtool --generate-privkey --outfile rslserver-key.pem --bits 2048 Generating a 2048 bit RSA private key...
certtool --generate-request --load-privkey rslserver-key.pem --outfile request.pem Generating a PKCS #10 certificate request... Country name (2 chars): ind Organization name: Myorg Organizational unit name: Mybu Locality name: blr State or province name: ka Common name: dhcp-blr-kmgm-blk2-4fl-6fl-10-178-23-94.in.oracle.com UID: Enter a dnsName of the subject of the certificate: dhcp-blr-kmgm-blk2-4fl-6fl-10-178-23-94.in.oracle.com Enter a dnsName of the subject of the certificate: Enter the IP address of the subject of the certificate: Enter the e-mail of the subject of the certificate: Enter a challenge password: Does the certificate belong to an authority? (y/N): n Will the certificate be used for signing (DHE and RSA-EXPORT ciphersuites)? (y/N): Will the certificate be used for encryption (RSA ciphersuites)? (y/N): Is this a TLS web client certificate? (y/N): y Is this also a TLS web server certificate? (y/N): y Generating server key certificate using request.pem
# certtool --generate-certificate --load-request request.pem --outfilerslserver-cert.pem --load-ca-certificate ca.pem --load-ca-privkey ca-key.pem Generating a signed certificate... Enter the certificate's serial number in decimal (default: 1482512336): Activation/Expiration time. The certificate will expire in (days): 3650 Extensions. Do you want to honour the extensions from the request? (y/N): Does the certificate belong to an authority? (y/N): n Is this a TLS web client certificate? (y/N): y Is this also a TLS web server certificate? (y/N): y Enter a dnsName of the subject of the certificate: dhcp-blr-kmgm-blk2-4fl-6fl-10-178-23-94.in.oracle.com Enter a dnsName of the subject of the certificate: Enter the IP address of the subject of the certificate: Will the certificate be used for signing (DHE and RSA-EXPORT ciphersuites)? (y/N): Will the certificate be used for encryption (RSA ciphersuites)? (y/N): X.509 Certificate Information: Version: 3 Serial Number (hex): 585d57d0 Validity: Not Before: Fri Dec 23 16:58:57 UTC 2016 Not After: Mon Dec 21 16:59:00 UTC 2026 Subject: C=ind,O=Myorg,OU=Mybu,L=blr,ST=ka,CN=dhcp-blr-kmgm-blk2-4fl-6fl-10-178-23-94.in.oracle.com Subject Public Key Algorithm: RSA Modulus (bits 2048): ac:2d:46:c2:41:7b:16:a6:80:7f:9f:46:2c:64:02:2d 61:f9:9d:dc:21:c6:fb:97:b0:cc:cb:00:ec:af:20:a3 09:8f:d2:6d:5c:56:46:1d:ff:bf:d6:e1:ce:70:08:04 67:6c:b0:bf:2f:02:c5:b7:03:0d:d5:c6:15:5c:af:5c b3:1f:98:5b:80:09:60:8c:f2:4f:80:cf:9c:f2:bc:a3 81:46:b0:49:e3:ac:73:79:26:30:b6:41:b5:5a:19:3a a4:a6:c7:3f:9b:7e:b9:ea:70:ea:21:87:38:68:f1:aa 01:0b:93:73:72:09:cf:7a:96:59:90:37:e5:ea:3b:c8 fa:f0:8b:ab:1a:f9:7b:9c:ee:c4:fc:92:0d:fe:01:ec 5d:3e:a8:dc:35:26:05:8d:d8:f2:94:0d:01:76:2a:64 d1:67:9d:ab:44:4c:a8:24:d6:d7:5a:70:76:f4:da:04 ff:40:0c:1a:5e:49:a2:65:69:94:88:08:71:70:1f:c9 a3:a0:b0:99:61:39:7a:a0:2a:b7:e8:ca:28:fd:52:89 f5:a2:32:ff:b8:38:12:39:2f:9a:2b:0d:16:33:91:1d 4f:49:78:1b:51:43:b0:d7:6d:bd:2e:84:73:d3:33:9a 3a:82:98:38:06:ed:e8:56:c6:41:2a:69:89:9e:26:b3 Exponent (bits 24): 01:00:01 Extensions: Basic Constraints (critical): Certificate Authority (CA): FALSE Key Purpose (not critical): TLS WWW Client. TLS WWW Server. Subject Alternative Name (not critical): DNSname: dhcp-blr-kmgm-blk2-4fl-6fl-10-178-23-94.in.oracle.com Subject Key Identifier (not critical): f7f986ecdd10bf2646cd74f7e20e3d9b0f746765 Authority Key Identifier (not critical): b606f5fa9bcd986ec25d2496c7d3a5c9270cc5f7 Other Information: Public Key Id: f7f986ecdd10bf2646cd74f7e20e3d9b0f746765 Is the above information ok? (Y/N): y Signing certificate...
2. Salin sertifikat ca.pem, rsl-client* ke klien dan sertifikat server ke rsyslog-server
# rsync -aP rslserver-* [email protected]:/etc/pki/tls/private/ # rsync -aP ca.pem [email protected]:/etc/pki/tls/private/
# ls -l /etc/pki/tls/private/ total 12 -rw-r--r-- 1 root root 1233 Dec 23 19:58 ca.pem -rw-r--r-- 1 root root 1452 Dec 23 20:06 rslclient-cert.pem -rw------- 1 root root 1679 Dec 23 19:59 rslclient-key.pem
# ls -l /etc/pki/tls/private/ total 12 -rw-r--r-- 1 root root 1233 Dec 23 20:09 ca.pem -rw-r--r-- 1 root root 1448 Dec 23 20:09 rslserver-cert.pem -rw------- 1 root root 1675 Dec 23 20:09 rslserver-key.pem
Konfigurasi Rsyslog
1. Instal kedua paket di rsyslog-client/rsyslog-server.
rsyslog-gnutls-5.8.10-10.0.1.el6_6.x86_64 rsyslog-5.8.10-10.0.1.el6_6.x86_64 gnutls-utils-2.8.5-19.el6_7.x86_64 gnutls-2.8.5-19.el6_7.x86_64
2. Konfigurasi server RSYSLOG:
– Tambahkan modul/konfigurasi di bawah ini ke
Catatan :Modul harus dalam urutan di bawah karena driver harus dimuat sebelum modul imtcp.
$DefaultNetstreamDriver gtls $DefaultNetstreamDriverCAFile /etc/pki/tls/private/ca.pem $DefaultNetstreamDriverCertFile /etc/pki/tls/private/rslserver-cert.pem $DefaultNetstreamDriverKeyFile /etc/pki/tls/private/rslserver-key.pem $ModLoad imtcp $InputTCPServerStreamDriverAuthMode anon $InputTCPServerStreamDriverMode 1 # run driver in TLS-only mode $ActionSendStreamDriverAuthMode x509/name $ActionSendStreamDriverPermittedPeer dhcp-blr-kmgm-blk2-4fl-6fl-10-178-22-154.in.oracle.com $ActionSendStreamDriverMode 1 # run driver in TLS-only mode $InputTCPServerRun 514 # Increase the amount of open files rsyslog is allowed, which includes open tcp sockets # This is important if there are many clients. # http://www.rsyslog.com/doc/rsconf1_maxopenfiles.html $MaxOpenFiles 2048
Contoh:
# cat /etc/rsyslog.conf # rsyslog v5 configuration file # For more information see /usr/share/doc/rsyslog-*/rsyslog_conf.html # If you experience problems, see http://www.rsyslog.com/doc/troubleshoot.html #### MODULES #### $ModLoad imuxsock # provides support for local system logging (e.g. via logger command) $ModLoad imklog # provides kernel logging support (previously done by rklogd) #$ModLoad immark # provides --MARK-- message capability # Provides UDP syslog reception #$ModLoad imudp #$UDPServerRun 514 # Provides TCP syslog reception #### GLOBAL DIRECTIVES #### # Use default timestamp format $ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat # File syncing capability is disabled by default. This feature is usually not required, # not useful and an extreme performance hit #$ActionFileEnableSync on # Include all config files in /etc/rsyslog.d/ $IncludeConfig /etc/rsyslog.d/*.conf $DefaultNetstreamDriver gtls $DefaultNetstreamDriverCAFile /etc/pki/tls/private/ca.pem $DefaultNetstreamDriverCertFile /etc/pki/tls/private/rslserver-cert.pem $DefaultNetstreamDriverKeyFile /etc/pki/tls/private/rslserver-key.pem $ModLoad imtcp $InputTCPServerStreamDriverAuthMode anon $InputTCPServerStreamDriverMode 1 # run driver in TLS-only mode $ActionSendStreamDriverAuthMode x509/name $ActionSendStreamDriverPermittedPeer dhcp-blr-kmgm-blk2-4fl-6fl-10-178-22-154.in.oracle.com ======>>>> mention your rsyslog peer name or pattern ( *.) $ActionSendStreamDriverMode 1 # run driver in TLS-only mode $InputTCPServerRun 514 # Increase the amount of open files rsyslog is allowed, which includes open tcp sockets # This is important if there are many clients. # http://www.rsyslog.com/doc/rsconf1_maxopenfiles.html $MaxOpenFiles 2048 #### RULES #### # Log all kernel messages to the console. # Logging much else clutters up the screen. #kern.* /dev/console # Log anything (except mail) of level info or higher. # Don't log private authentication messages! *.info;mail.none;authpriv.none;cron.none /var/log/messages # The authpriv file has restricted access. authpriv.* /var/log/secure # Log all the mail messages in one place. mail.* -/var/log/maillog # Log cron stuff cron.* /var/log/cron # Everybody gets emergency messages *.emerg * # Save news errors of level crit and higher in a special file. uucp,news.crit /var/log/spooler # Save boot messages also to boot.log local7.* /var/log/boot.log # ### begin forwarding rule ### # The statement between the begin ... end define a SINGLE forwarding # rule. They belong together, do NOT split them. If you create multiple # forwarding rules, duplicate the whole block! # Remote Logging (we use TCP for reliable delivery) # # An on-disk queue is created for this action. If the remote host is # down, messages are spooled to disk and sent when it is up again. #$WorkDirectory /var/lib/rsyslog # where to place spool files #$ActionQueueFileName fwdRule1 # unique name prefix for spool files #$ActionQueueMaxDiskSpace 1g # 1gb space limit (use as much as possible) #$ActionQueueSaveOnShutdown on # save messages to disk on shutdown #$ActionQueueType LinkedList # run asynchronously #$ActionResumeRetryCount -1 # infinite retries if host is down # remote host is: name/ip:port, e.g. 192.168.0.1:514, port optional #*.* @@remote-host:514 # ### end of the forwarding rule ###
konfigurasi klien rsyslog
Pastikan kita memiliki arahan di bawah ini.
$DefaultNetstreamDriver gtls $DefaultNetstreamDriverCAFile /etc/pki/tls/private/ca.pem $DefaultNetstreamDriverCertFile /etc/pki/tls/private/rslclient-cert.pem $DefaultNetstreamDriverKeyFile /etc/pki/tls/private/rslclient-key.pem $ActionSendStreamDriverPermittedPeer dhcp-blr-kmgm-blk2-4fl-6fl-10-178-23-94.in.oracle.com =======>>> that should be your rsyslog server $ActionSendStreamDriverMode 1 # run driver in TLS-only mode $ActionSendStreamDriverAuthMode x509/name
Contoh:
# cat /etc/rsyslog.conf # rsyslog v5 configuration file # For more information see /usr/share/doc/rsyslog-*/rsyslog_conf.html # If you experience problems, see http://www.rsyslog.com/doc/troubleshoot.html #### MODULES #### $ModLoad imuxsock # provides support for local system logging (e.g. via logger command) $ModLoad imklog # provides kernel logging support (previously done by rklogd) #$ModLoad immark # provides --MARK-- message capability # Provides UDP syslog reception #$ModLoad imudp #$UDPServerRun 514 # Provides TCP syslog reception #$ModLoad imtcp #$InputTCPServerRun 514 #### GLOBAL DIRECTIVES #### # Use default timestamp format $ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat # File syncing capability is disabled by default. This feature is usually not required, # not useful and an extreme performance hit #$ActionFileEnableSync on # Include all config files in /etc/rsyslog.d/ $IncludeConfig /etc/rsyslog.d/*.conf $DefaultNetstreamDriver gtls $DefaultNetstreamDriverCAFile /etc/pki/tls/private/ca.pem $DefaultNetstreamDriverCertFile /etc/pki/tls/private/rslclient-cert.pem $DefaultNetstreamDriverKeyFile /etc/pki/tls/private/rslclient-key.pem $ActionSendStreamDriverPermittedPeer dhcp-blr-kmgm-blk2-4fl-6fl-10-178-23-94.in.oracle.com $ActionSendStreamDriverMode 1 # run driver in TLS-only mode $ActionSendStreamDriverAuthMode x509/name #$ActionSendStreamDriverAuthMode x509/name #$ActionSendStreamDriverPermittedPeer * #$ActionSendStreamDriverMode 1 # run driver in TLS-only mode #### RULES #### # Log all kernel messages to the console. # Logging much else clutters up the screen. #kern.* /dev/console # Log anything (except mail) of level info or higher. # Don't log private authentication messages! *.info;mail.none;authpriv.none;cron.none /var/log/messages # The authpriv file has restricted access. authpriv.* /var/log/secure # Log all the mail messages in one place. mail.* -/var/log/maillog # Log cron stuff cron.* /var/log/cron # Everybody gets emergency messages *.emerg * # Save news errors of level crit and higher in a special file. uucp,news.crit /var/log/spooler # Save boot messages also to boot.log local7.* /var/log/boot.log # ### begin forwarding rule ### # The statement between the begin ... end define a SINGLE forwarding # rule. They belong together, do NOT split them. If you create multiple # forwarding rules, duplicate the whole block! # Remote Logging (we use TCP for reliable delivery) # # An on-disk queue is created for this action. If the remote host is # down, messages are spooled to disk and sent when it is up again. #$WorkDirectory /var/lib/rsyslog # where to place spool files #$ActionQueueFileName fwdRule1 # unique name prefix for spool files #$ActionQueueMaxDiskSpace 1g # 1gb space limit (use as much as possible) #$ActionQueueSaveOnShutdown on # save messages to disk on shutdown #$ActionQueueType LinkedList # run asynchronously #$ActionResumeRetryCount -1 # infinite retries if host is down # remote host is: name/ip:port, e.g. 192.168.0.1:514, port optional *.* @@10.178.23.94:514 ========>>>>>> server:port :msg, contains, "kernel" @@10.178.23.94:514 # ### end of the forwarding rule ###
Langkah terakhir :restart layanan pada kedua klien/server.
service rsyslog restart Shutting down system logger: [ OK ] Starting system logger: [ OK ]
Keluaran yang diharapkan:
# tailf /var/log/messages Dec 23 22:36:20 server2 kernel: IPv6: eth2: IPv6 duplicate address 2606:b400:c11:68:a00:27ff:fedd:bb31 detected! ========>>>> client messages here Dec 23 22:38:54 server2 kernel: IPv6: eth1: IPv6 duplicate address 2606:b400:c11:68:a00:27ff:feb6:a80e detected! Dec 23 22:38:54 server1 kernel: IPv6: eth1: IPv6 duplicate address 2606:b400:c11:68:a00:27ff:feb6:a80e detected! Dec 23 22:38:55 server1 kernel: IPv6: eth2: IPv6 duplicate address 2606:b400:c11:68:a00:27ff:fedd:bb31 detected! Dec 23 22:41:28 server2 kernel: IPv6: eth1: IPv6 duplicate address 2606:b400:c11:68:a00:27ff:feb6:a80e detected! Dec 23 22:41:28 server1 kernel: IPv6: eth1: IPv6 duplicate address 2606:b400:c11:68:a00:27ff:feb6:a80e detected! Dec 23 22:41:29 server1 kernel: IPv6: eth2: IPv6 duplicate address 2606:b400:c11:68:a00:27ff:fedd:bb31 detected! Dec 23 22:44:44 server2 kernel: IPv6: eth1: IPv6 duplicate address 2606:b400:c11:68:a00:27ff:feb6:a80e detected! Dec 23 22:44:44 server1 kernel: IPv6: eth1: IPv6 duplicate address 2606:b400:c11:68:a00:27ff:feb6:a80e detected! Dec 23 22:44:44 server1 kernel: IPv6: eth2: IPv6 duplicate address 2606:b400:c11:68:a00:27ff:fedd:bb31 detected! Dec 23 22:45:12 server1 kernel: Kernel logging (proc) stopped. =====>>> client messages got logged to the rsyslogserver Dec 23 22:45:12 server1 rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="6340" x-info="http://www.rsyslog.com"] exiting on signal 15. Dec 23 22:45:12 server1 kernel: imklog 5.8.10, log source = /proc/kmsg started. Dec 23 22:45:12 server1 rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="6679" x-info="http://www.rsyslog.com"] start
# tcpdump -nnvvvS -s 0 -U -w /tmp/sniff.rsyslog dst 10.178.23.94 and dst port 514 tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes ^C133 packets captured 133 packets received by filter 0 packets dropped by kernel 3211 packets dropped by interface
Pemecahan Masalah
Berdasarkan kesalahan dari server rsyslog:
1. Jika Anda melihat pesan terenkripsi dan bukan dalam teks biasa, maka kita harus memeriksa urutan modul, ini terjadi karena driver gtls dimuat setelah port imtcp.
Dec 23 19:34:36 rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="3344" x-info="http://www.rsyslog.com"] start
Dec 23 19:34:41 #026#003#002#000V#001#000#000R#003#002X].�i�)�#005t�#037F�{ot �f�\���Y��L�#013�#000#000$#0003#000E#0009#000�#000#026#0002#000D#0008#000�#000#023#000f#000/#000A#0005#000�
Dec 23 19:34:42 #026#003#002#000V#001#000#000R#003#002X].��#0158��9��n���Mz�S���W"co��#015#000#000$#0003#000E#0009#000�#000#026#0002#000D#0008#000�#000#023#000f#000/#000A#0005#000� 2. modul tidak ditemukan :
Dec 23 20:09:39 rsyslogd-2067: could not load module '/lib64/rsyslog/lmnsd_gtls.so', dlsym: x^D: undefined symbol: modInit
A) Periksa sertifikat dan terbitkan ulang atau salin ke server.
3. Verifikasi parameter ini ” $ActionSendStreamDriverAuthMode x509/name”
Dec 23 19:53:20 rsyslogd-2088: error: peer name not authorized - not permitted to talk to it. Names: (null) [try http://www.rsyslog.com/e/2088 ] Dec 23 19:53:20 rsyslogd-2089: netstream session 0x7fb45c01c0e0 will be closed due to error [try http://www.rsyslog.com/e/2089 ]
Kesalahan konfigurasi dasar :
Dec 23 19:32:50 rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="3262" x-info="http://www.rsyslog.com"] start Dec 23 19:32:50 rsyslogd-3003: invalid or yet-unknown config file command - have you forgotten to load a module? [try http://www.rsyslog.com/e/3003 ] Dec 23 19:32:50 rsyslogd: the last error occured in /etc/rsyslog.conf, line 36:"$InputTCPServerStreamDriverAuthMode x509/name" Dec 23 19:32:50 rsyslogd-3003: invalid or yet-unknown config file command - have you forgotten to load a module? [try http://www.rsyslog.com/e/3003 ] Dec 23 19:32:50 rsyslogd: the last error occured in /etc/rsyslog.conf, line 37:"$InputTCPServerStreamDriverMode 1 # run driver in TLS-only mode"
Cara Mengakses Server VNC Melalui Web Browser di Linux
Cara Mengaktifkan Desktop Jarak Jauh untuk Membagikan Sesi Desktop Saat Ini di CentOS/RHEL 7