Mengumpulkan log Firewall Zscaler

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Google SecOps SIEM

Catatan: Fitur ini tercakup dalam Persyaratan Penawaran Pra-GA dari Persyaratan Khusus Layanan Operasi Keamanan Google. Fitur pra-GA mungkin memiliki dukungan terbatas, dan perubahan pada fitur pra-GA mungkin tidak kompatibel dengan versi pra-GA lainnya. Untuk mengetahui informasi selengkapnya, lihat panduan Layanan Dukungan Teknis Google Security Operations dan Persyaratan Khusus Layanan Google Security Operations.

Dokumen ini menjelaskan cara mengekspor log Firewall Zscaler dengan menyiapkan feed Google Security Operations dan cara kolom log dipetakan ke kolom Unified Data Model (UDM) Google SecOps.

Untuk mengetahui informasi selengkapnya, lihat Ringkasan penyerapan data ke Google SecOps.

Deployment standar terdiri dari Firewall Zscaler dan feed Webhook Google SecOps yang dikonfigurasi untuk mengirim log ke Google SecOps. Setiap deployment pelanggan dapat berbeda dan mungkin lebih kompleks.

Deployment berisi komponen berikut:

• Firewall Zscaler: Platform tempat Anda mengumpulkan log.

• Feed Google SecOps: Feed Google SecOps yang mengambil log dari Zscaler Firewall dan menulis log ke Google SecOps.

• Google SecOps: Mempertahankan dan menganalisis log.

Label penyerapan mengidentifikasi parser yang menormalisasi data log mentah ke format UDM terstruktur. Informasi dalam dokumen ini berlaku untuk parser dengan label transfer ZSCALER_FIREWALL.

Sebelum memulai

• Pastikan Anda memiliki akses ke konsol Akses Internet Zscaler. Untuk informasi selengkapnya, lihat Bantuan ZIA Akses Internet dan SaaS yang Aman.
• Pastikan Anda menggunakan Zscaler Firewall 2024 atau yang lebih baru.
• Pastikan semua sistem dalam arsitektur deployment dikonfigurasi dengan zona waktu UTC.
• Pastikan Anda memiliki kunci API yang diperlukan untuk menyelesaikan penyiapan feed di Google SecOps. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan kunci API.

Menyiapkan feed transfer di Google SecOps untuk menyerap log Firewall Zscaler

1. Buka SIEM Settings > Feeds.
2. Klik Tambahkan baru.
3. Di kolom Feed name, masukkan nama untuk feed (misalnya, Zscaler Firewall Logs).
4. Pilih Webhook sebagai Jenis Sumber.
5. Pilih ZScaler NGFW sebagai Jenis Log.
6. Klik Berikutnya.
7. Opsional: Masukkan nilai untuk parameter input berikut:
   1. Pemisah pemisahan: pemisah yang digunakan untuk memisahkan baris log. Biarkan kosong jika pembatas tidak digunakan.
   2. Namespace aset: namespace aset.
   3. Label penyerapan: label yang akan diterapkan ke peristiwa dari feed ini.
8. Klik Berikutnya.
9. Tinjau konfigurasi feed baru Anda, lalu klik Kirim.
10. Klik Buat Kunci Rahasia untuk membuat kunci rahasia guna mengautentikasi feed ini.

Menyiapkan Firewall Zscaler

1. Di konsol Zscaler Internet Access, klik Administration > Nanolog Streaming Service > Cloud NSS Feeds, lalu klik Add Cloud NSS Feed.
2. Jendela Add Cloud NSS Feed akan muncul. Di jendela Tambahkan Feed NSS Cloud, masukkan detailnya.
3. Masukkan nama untuk feed di kolom Feed Name.
4. Pilih NSS for Firewall di NSS Type.
5. Pilih status dari daftar Status untuk mengaktifkan atau menonaktifkan feed NSS.
6. Tetapkan nilai di drop-down SIEM Rate sebagai Unlimited. Untuk menyembunyikan aliran output karena pemberian lisensi atau batasan lainnya, ubah nilainya.
7. Pilih Lainnya di daftar Jenis SIEM.
8. Pilih Nonaktif di daftar Autentikasi OAuth 2.0.
9. Masukkan batas ukuran untuk setiap payload permintaan HTTP ke praktik terbaik SIEM di Max Batch Size. Misalnya, 512 KB.

10. Masukkan URL HTTPS endpoint Chronicle API di URL API dalam format berikut:

      https://<CHRONICLE_REGION>-chronicle.googleapis.com/v1alpha/projects/<GOOGLE_PROJECT_NUMBER>/locations/<LOCATION>/instances/<CUSTOMER_ID>/feeds/<FEED_ID>:importPushLogs
    

    • CHRONICLE_REGION: Region tempat instance Chronicle Anda dihosting. Misalnya, US.
    • GOOGLE_PROJECT_NUMBER: Nomor project BYOP. Dapatkan ini dari C4.
    • LOCATION: Region Chronicle. Misalnya, AS.
    • CUSTOMER_ID: ID pelanggan Chronicle. Dapatkan dari C4.
    • FEED_ID: ID feed yang ditampilkan di UI Feed pada webhook baru yang dibuat
    • Contoh URL API:

    https://us-chronicle.googleapis.com/v1alpha/projects/12345678910/locations/US/instances/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/feeds/yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy:importPushLogs
    

11. Klik Tambahkan Header HTTP untuk menambahkan header HTTP lainnya dengan kunci dan nilai.

    Misalnya, Header 1: Key1: X-goog-api-key dan Value1: Kunci API yang dibuat di Google Cloud Kredensial API BYOP.

12. Pilih Firewall Logs di daftar Log Types.

13. Pilih JSON di daftar Jenis Output Feed.

14. Tetapkan Feed Escape Character ke , \ ".

15. Untuk menambahkan kolom baru ke Format Output Feed,pilih Kustom di daftar Jenis Output Feed.

16. Salin-tempel Format Output Feed dan tambahkan kolom baru. Pastikan nama kunci cocok dengan nama kolom yang sebenarnya.

17. Berikut adalah Format Output Feed default:

      \{ "sourcetype" : "zscalernss-fw", "event" :\{"datetime":"%s{time}","user":"%s{elogin}","department":"%s{edepartment}","locationname":"%s{elocation}","cdport":"%d{cdport}","csport":"%d{csport}","sdport":"%d{sdport}","ssport":"%d{ssport}","csip":"%s{csip}","cdip":"%s{cdip}","ssip":"%s{ssip}","sdip":"%s{sdip}","tsip":"%s{tsip}","tunsport":"%d{tsport}","tuntype":"%s{ttype}","action":"%s{action}","dnat":"%s{dnat}","stateful":"%s{stateful}","aggregate":"%s{aggregate}","nwsvc":"%s{nwsvc}","nwapp":"%s{nwapp}","proto":"%s{ipproto}","ipcat":"%s{ipcat}","destcountry":"%s{destcountry}","avgduration":"%d{avgduration}","rulelabel":"%s{erulelabel}","inbytes":"%ld{inbytes}","outbytes":"%ld{outbytes}","duration":"%d{duration}","durationms":"%d{durationms}","numsessions":"%d{numsessions}","ipsrulelabel":"%s{ipsrulelabel}","threatcat":"%s{threatcat}","threatname":"%s{ethreatname}","deviceowner":"%s{deviceowner}","devicehostname":"%s{devicehostname}"\}\}
    

18. Pilih zona waktu untuk kolom Time dalam file output di daftar Timezone. Secara default, zona waktu ditetapkan ke zona waktu organisasi Anda.

19. Tinjau setelan yang dikonfigurasi.

20. Klik Simpan untuk menguji konektivitas. Jika koneksi berhasil, tanda centang hijau yang disertai pesan Uji Konektivitas Berhasil: OK (200) akan muncul.

Untuk informasi selengkapnya tentang feed Google SecOps, lihat dokumentasi feed Google SecOps. Untuk mengetahui informasi tentang persyaratan untuk setiap jenis feed, lihat Konfigurasi feed menurut jenis.

Jika Anda mengalami masalah saat membuat feed, hubungi dukungan Google SecOps.

Referensi pemetaan kolom

Tabel berikut mencantumkan kolom log dari jenis log ZSCALER_FIREWALL dan kolom UDM yang sesuai.

Log field	UDM mapping	Logic
fwd_gw_name	intermediary.resource.name
	intermediary.resource.resource_type	If the fwd_gw_name log field value is not empty or the ofwd_gw_name log field value is not empty, then the intermediary.resource.resource_type UDM field is set to GATEWAY.
ofwd_gw_name	intermediary.security_result.detection_fields[ofwd_gw_name]
ordr_rulename	intermediary.security_result.detection_fields[ordr_rulename]
orulelabel	intermediary.security_result.detection_fields[orulelabel]
rdr_rulename	intermediary.security_result.rule_name
rulelabel	intermediary.security_result.rule_name
erulelabel	intermediary.security_result.rule_name
bypass_etime	metadata.collected_timestamp
datetime	metadata.event_timestamp
epochtime	metadata.event_timestamp
	metadata.event_type	If the sdport log field value is equal to 80 or the sdport log field value is equal to 443 and the csip log field value is not empty or the tsip log field value is not empty or the ssip log field value is not empty and the cdip log field value is not empty or the sdip log field value is not empty, then the metadata.event_type UDM field is set to NETWORK_HTTP. Else, if the csip log field value is not empty or the tsip log field value is not empty or the ssip log field value is not empty and the cdip log field value is not empty or the sdip log field value is not empty, then the metadata.event_type UDM field is set to NETWORK_CONNECTION. Else, if the csip log field value is not empty or the tsip log field value is not empty or the ssip log field value is not empty, then the metadata.event_type UDM field is set to STATUS_UPDATE. Else, the metadata.event_type UDM field is set to GENERIC_EVENT.
recordid	metadata.product_log_id
	metadata.product_name	The metadata.product_name UDM field is set to Firewall.
	metadata.vendor_name	The metadata.vendor_name UDM field is set to Zscaler.
proto	network.ip_protocol	If the proto log field value contain one of the following values, then the proto log field is mapped to the network.ip_protocol UDM field. TCP UDP ICMP GRE IP6IN4 IGMP
inbytes	network.received_bytes
outbytes	network.sent_bytes
avgduration	network.session_duration.nanos	If the durationms log field value is empty and the avgduration log field value is not empty, then the avgduration log field is mapped to the network.session_duration.nanos UDM field.
durationms	network.session_duration.nanos	If the durationms log field value is not empty, then the durationms log field is mapped to the network.session_duration.nanos UDM field.
duration	network.session_duration.seconds
	principal.asset.asset_id	If the devicename log field value is not empty, then the Zscaler:devicename log field is mapped to the principal.asset.asset_id UDM field.
devicemodel	principal.asset.hardware.model
devicehostname	principal.asset.hostname	If the devicehostname log field value is not empty, then the devicehostname log field is mapped to the principal.asset.hostname UDM field.
	principal.asset.platform_software.platform	If the deviceostype log field value matches the regular expression pattern (?i)iOS, then the principal.asset.platform_software.platform UDM field is set to IOS. Else, if the deviceostype log field value matches the regular expression pattern (?i)Android, then the principal.asset.platform_software.platform UDM field is set to ANDROID. Else, if the deviceostype log field value matches the regular expression pattern (?i)Windows, then the principal.asset.platform_software.platform UDM field is set to WINDOWS. Else, if the deviceostype log field value matches the regular expression pattern (?i)MAC, then the principal.asset.platform_software.platform UDM field is set to MAC. Else, if the deviceostype log field value matches the regular expression pattern (?i)Other, then the principal.asset.platform_software.platform UDM field is set to UNKNOWN_PLATFORM.
deviceosversion	principal.asset.platform_software.platform_version
external_deviceid	principal.asset.product_object_id
csip	principal.ip
tsip	principal.ip
srcip_country	principal.location.country_or_region
location	principal.location.name
locationname	principal.location.name
ssip	principal.nat_ip
ssport	principal.nat_port
csport	principal.port
dept	principal.user.department
department	principal.user.department
login	principal.user.email_addresses	The login field is extracted from login log field using the Grok pattern, and the login log field is mapped to the principal.user.email_addresses UDM field.
user	principal.user.email_addresses	The user field is extracted from user log field using the Grok pattern, and the user log field is mapped to the principal.user.email_addresses UDM field.
deviceowner	principal.user.userid
	security_result.action	If the action log field value matches the regular expression pattern ^Allow.*, then the security_result.action UDM field is set to ALLOW. Else, if the action log field value matches the regular expression pattern ^Drop.* or ^Block.*, then the security_result.action UDM field is set to BLOCK. Else, if the action log field value is equal to Reset, then the security_result.action UDM field is set to BLOCK.
action	security_result.action_details
	security_result.category	If the ipcat log field value is not empty or the oipcat log field value is not empty, then the security_result.category UDM field is set to NETWORK_CATEGORIZED_CONTENT.
ipcat	security_result.category_details	The ipcat log field is mapped to the security_result.category_details UDM field.
threatcat	security_result.category_details	If the threatcat log field value is not equal to None, then the threatcat log field is mapped to the security_result.category_details UDM field.
	security_result.detection_fields[bypassed_session]	If the bypassed_session log field value is equal to 0, then the security_result.detection_fields.bypassed_session UDM field is set to the traffic did not bypass Zscaler Client Connector. Else, if the bypassed_session log field value is equal to 1, then the security_result.detection_fields.bypassed_session UDM field is set to the traffic bypassed Zscaler Client Connector.
odevicehostname	security_result.detection_fields[odevicehostname]
odevicename	security_result.detection_fields[odevicename]
odeviceowner	security_result.detection_fields[odeviceowner]
oipcat	security_result.detection_fields[oipcat]
oipsrulelabel	security_result.detection_fields[oipsrulelabel]
numsessions	security_result.detection_fields[numsessions]
	security_result.rule_labels [ips_custom_signature]	If the ips_custom_signature log field value is equal to 0, then the security_result.rule_labels.ips_custom_signature UDM field is set to non-custom IPS rule. Else, if the ips_custom_signature log field value is equal to 1, then the security_result.rule_labels.ips_custom_signature UDM field is set to custom IPS rule.
ipsrulelabel	security_result.rule_name	If the ipsrulelabel log field value is not equal to None, then the ipsrulelabel log field is mapped to the security_result.rule_name UDM field.
threatname	security_result.threat_name	If the threatname log field value is not equal to None, then the threatname log field is mapped to the security_result.threat_name UDM field.
ethreatname	security_result.threat_name	If the ethreatname log field value is not equal to None, then the ethreatname log field is mapped to the security_result.threat_name UDM field.
nwapp	target.application
cdfqdn	target.domain.name
sdip	target.ip
datacentercity	target.location.city
destcountry	target.location.country_or_region
datacentercountry	target.location.country_or_region
datacenter	target.location.name
cdip	target.nat_ip
cdport	target.nat_port
sdport	target.port
odnatlabel	target.security_result.detection_fields[odnatlabel]
dnat	target.security_result.rule_labels[dnat]
dnatrulelabel	target.security_result.rule_name
aggregate	additional.fields[aggregate]
day	additional.fields[day]
dd	additional.fields[dd]
deviceappversion	additional.fields[deviceappversion]
eedone	additional.fields[eedone]
flow_type	additional.fields[flow_type]
hh	additional.fields[hh]
mm	additional.fields[mm]
mon	additional.fields[mon]
mth	additional.fields[mth]
nwsvc	additional.fields[nwsvc]
ocsip	additional.fields[ocsip]
ozpa_app_seg_name	additional.fields[ozpa_app_seg_name]
ss	additional.fields[ss]
sourcetype	additional.fields[sourcetype]
stateful	additional.fields[stateful]
tz	additional.fields[tz]
tuntype	additional.fields[traffic_forwarding_method]
tunsport	additional.fields[tunsport]
yyyy	additional.fields[yyyy]
zpa_app_seg_name	additional.fields[zpa_app_seg_name]
ztunnelversion	additional.fields[ztunnelversion]