Collecter les journaux Zscaler CASB
Ce document explique comment exporter les journaux Zscaler CASB en configurant un flux Google Security Operations et en mappant les champs de journaux au modèle de données unifié (UDM).
Pour en savoir plus, consultez Présentation de l'ingestion de données dans Google SecOps.
Un déploiement typique se compose de Zscaler CASB et d'un flux de webhook Google SecOps configuré pour envoyer des journaux à Google SecOps. Toutefois, les détails du déploiement peuvent varier selon le client et être plus complexes.
Le déploiement contient les composants suivants :
Zscaler CASB : plate-forme à partir de laquelle vous collectez les journaux.
Flux Google SecOps : flux Google SecOps qui récupère les journaux de Zscaler CASB et les écrit dans Google SecOps.
Google SecOps : conserve et analyse les journaux.
Un libellé d'ingestion identifie l'analyseur qui normalise les données de journaux brutes au format UDM structuré. Ce document s'applique spécifiquement au parseur associé au libellé d'ingestion ZSCALER_CASB.
Avant de commencer
- Assurez-vous d'avoir accès à la console Zscaler Internet Access. Pour en savoir plus, consultez l'aide ZIA sur la sécurisation de l'accès à Internet et aux SaaS.
- Assurez-vous d'utiliser Zscaler CASB version 1.0 ou 2.0.
- Assurez-vous que tous les systèmes de l'architecture de déploiement sont configurés avec le fuseau horaire UTC.
- Assurez-vous de disposer de la clé API requise pour configurer le flux dans Google SecOps. Pour en savoir plus, consultez Configurer des clés API.
Configurer des flux
Pour configurer ce type de journal, procédez comme suit :
- Accédez à Paramètres SIEM> Flux.
- Cliquez sur Add New Feed (Ajouter un flux).
- Cliquez sur le pack de flux Zscaler.
- Recherchez le type de journal requis, puis cliquez sur Ajouter un flux.
Saisissez les valeurs des paramètres d'entrée suivants :
- Type de source : Webhook (recommandé)
- Délimiteur de fractionnement : caractère utilisé pour séparer les lignes de journaux. Laissez ce champ vide si aucun délimiteur n'est utilisé.
Options avancées
- Nom du flux : valeur préremplie qui identifie le flux.
- Espace de noms de l'élément : espace de noms associé au flux.
- Libellés d'ingestion : libellés appliqués à tous les événements de ce flux.
Cliquez sur Créer un flux.
Pour en savoir plus sur la configuration de plusieurs flux pour différents types de journaux dans cette famille de produits, consultez Configurer des flux par produit.
Configurer Zscaler CASB
- Dans la console Zscaler Internet Access, cliquez sur Administration > Nanolog Streaming Service > Flux Cloud NSS > Ajouter un flux Cloud NSS.
- Dans la fenêtre Ajouter un flux Cloud NSS, saisissez les informations.
- Dans le champ Nom du flux, saisissez un nom unique pour le flux.
- Sélectionnez Zscaler for Web dans Type NSS.
- Dans la liste État, sélectionnez un état pour activer ou désactiver le flux NSS.
- Laissez Débit du SIEM sur Illimité, sauf si vous devez limiter le flux de sortie en raison de contraintes de licence ou autres.
- Dans la liste Type de SIEM, sélectionnez Autre.
- Dans la liste Authentification OAuth 2.0, sélectionnez Désactivée.
- Dans le champ Taille maximale du lot, saisissez une limite de taille pour la charge utile d'une requête HTTP individuelle, conformément aux bonnes pratiques du SIEM (par exemple,
512 KB
). Dans le champ URL de l'API, saisissez l'URL HTTPS du point de terminaison de l'API Chronicle au format suivant :
https://<CHRONICLE_REGION>-chronicle.googleapis.com/v1alpha/projects/<GOOGLE_PROJECT_NUMBER>/locations/<LOCATION>/instances/<CUSTOMER_ID>/feeds/<FEED_ID>:importPushLogs
CHRONICLE_REGION
: région dans laquelle votre instance Google SecOps est hébergée. Exemple :US
GOOGLE_PROJECT_NUMBER
: numéro de votre projet BYOP. Obtenez-le auprès de C4.LOCATION
: région Chronicle (Google SecOps) (identique àCHRONICLE_REGION
). Par exemple,US
.CUSTOMER_ID
: ID client Google SecOps. Obtenez-le auprès de C4.FEED_ID
: ID du flux de webhook nouvellement créé (affiché dans l'UI Feed).Exemple d'URL d'API :
https://us-chronicle.googleapis.com/v1alpha/projects/12345678910/locations/US/instances/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/feeds/yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy:importPushLogs
Cliquez sur Ajouter un en-tête HTTP, puis ajoutez des en-têtes HTTP au format suivant :
Header 1
: Key1 :X-goog-api-key
et Value1 : clé API générée à partir des identifiants API de Google Cloud BYOP.Header 2
: Key2 :X-Webhook-Access-Key
et Value2 : clé secrète de l'API générée dans la section "SECRET KEY" (Clé secrète) du webhook.
Dans la liste Types de journaux, sélectionnez Sécurité SaaS ou Activité de sécurité SaaS.
Dans la liste Type de sortie du flux, sélectionnez JSON.
Définissez Caractère d'échappement du flux sur
, \ "
.Dans la liste Type de sortie du flux, sélectionnez Personnalisé pour ajouter un champ à Format de sortie du flux.
Copiez et collez le format de sortie du flux, puis ajoutez de nouveaux champs si nécessaire. Assurez-vous que les noms de clés correspondent aux noms de champs réels.
Voici les formats de sortie des flux par défaut :
- Sécurité SaaS
\{ "sourcetype" : "zscalernss-casb", "event" :\{"datetime":"%s{time}","recordid":"%d{recordid}","company":"%s{company}","tenant":"%s{tenant}","login":"%s{user}","dept":"%s{department}","applicationname":"%s{applicationname}","filename":"%s{filename}","filesource":"%s{filesource}","filemd5":"%s{filemd5}","threatname":"%s{threatname}","policy":"%s{policy}","dlpdictnames":"%s{dlpdictnames}","dlpdictcount":"%s{dlpdictcount}","dlpenginenames":"%s{dlpenginenames}","fullurl":"%s{fullurl}","lastmodtime":"%s{lastmodtime}","filescantimems":"%d{filescantimems}","filedownloadtimems":"%d{filedownloadtimems}"\}\}
- Activité de sécurité SaaS
\{ "sourcetype" : "zscalernss-casb", "event" :\{"login":"%s{username}","tenant":"%s{tenant}","object_type":"%d{objtype1}","applicationname":"%s{appname}","object_name_1":"%s{objnames1}","object_name_2":"%s{objnames2}"\}\}
Dans la liste Fuseau horaire, sélectionnez le fuseau horaire pour le champ Heure dans le fichier de sortie. Par défaut, le fuseau horaire est défini sur celui de votre organisation.
Vérifiez les paramètres configurés.
Cliquez sur Enregistrer pour tester la connectivité. Si la connexion est établie, une coche verte accompagnée du message Test de connectivité réussi : OK (200) s'affiche.
Pour en savoir plus sur les flux Google SecOps, consultez la documentation sur les flux Google SecOps. Pour en savoir plus sur les exigences de chaque type de flux, consultez Configuration des flux par type.
Si vous rencontrez des problèmes lors de la création de flux, contactez l'assistance Google SecOps.
Référence du mappage de champs
Documentation de référence sur le mappage des champs : ZSCALER_CASB
Le tableau suivant liste les champs de journaux du type de journal ZSCALER_CASB
et les champs UDM correspondants.
Log field | UDM mapping | Logic |
---|---|---|
sourcetype |
security_result.detection_fields[sourcetype] |
|
objnames2 |
about.resource.name |
|
object_name_2 |
about.resource.name |
|
objtypename2 |
about.resource.resource_subtype |
|
externalownername |
additional.fields[externalownername] |
|
act_cnt |
additional.fields[act_cnt] |
|
attchcomponentfiletypes |
additional.fields[attchcomponentfiletypes] |
|
channel_name |
additional.fields[channel_name] |
|
collabscope |
additional.fields[collabscope] |
|
day |
additional.fields[day] |
|
dd |
additional.fields[dd] |
|
dlpdictcount |
security_result.detection_fields[dlpdictcount] |
If the dlpdictcount log field value is not empty and the dlpdictcount log field value is not equal to None , then the dlpdictcount log field is mapped to the security_result.detection_fields.dlpdictcount UDM field. |
dlpenginenames |
security_result.detection_fields[dlpenginenames] |
If the dlpenginenames log field value is not empty and the dlpenginenames log field value is not equal to None , then the dlpenginenames log field is mapped to the security_result.detection_fields.dlpenginenames UDM field. |
epochlastmodtime |
additional.fields[epochlastmodtime] |
|
extcollabnames |
additional.fields[extcollabnames] |
|
extownername |
additional.fields[extownername] |
|
file_msg_id |
additional.fields[file_msg_id] |
|
fileid |
additional.fields[fileid] |
|
filescantimems |
additional.fields[filescantimems] |
|
filetypecategory |
additional.fields[filetypecategory] |
|
hh |
additional.fields[hh] |
|
messageid |
additional.fields[messageid] |
|
mm |
additional.fields[mm] |
|
mon |
additional.fields[mon] |
|
msgsize |
additional.fields[msgsize] |
|
mth |
additional.fields[mth] |
|
num_ext_recpts |
additional.fields[num_ext_recpts] |
|
num_int_recpts |
additional.fields[num_int_recpts] |
|
numcollab |
additional.fields[numcollab] |
|
rtime |
additional.fields[rtime] |
|
ss |
additional.fields[ss] |
|
suburl |
additional.fields[suburl] |
|
tenant |
additional.fields[tenant] |
|
tz |
additional.fields[tz] |
|
upload_doctypename |
additional.fields[upload_doctypename] |
|
yyyy |
additional.fields[yyyy] |
|
collabnames |
additional.fields[collabnames] |
|
companyid |
additional.fields[companyid] |
|
component |
additional.fields[component] |
|
intcollabnames |
additional.fields[intcollabnames] |
If intcollabnames log field value does not match the regular expression pattern None then, for index in intcollabnames , the index is mapped to the additional.fields.value.list_value UDM field. |
internal_collabnames |
additional.fields[internal_collabnames] |
|
external_collabnames |
additional.fields[externalcollabnames] |
|
num_external_collab |
additional.fields[num_external_collab] |
|
num_internal_collab |
additional.fields[num_internal_collab] |
|
repochtime |
additional.fields[repochtime] |
|
eventtime |
metadata.event_timestamp |
If the eventtime log field value is not empty, then the eventtime log field is mapped to the metadata.event_timestamp UDM field. |
epochtime |
metadata.event_timestamp |
If the epochtime log field value is not empty, then the epochtime log field is mapped to the metadata.event_timestamp UDM field. |
time |
metadata.event_timestamp |
If the time log field value is not empty, then the time log field is mapped to the metadata.event_timestamp UDM field. |
datetime |
metadata.event_timestamp |
If the datetime log field value is not empty, then the datetime log field is mapped to the metadata.event_timestamp UDM field. |
|
metadata.event_type |
The metadata.event_type UDM field is set to USER_UNCATEGORIZED . |
act_type_name |
metadata.product_event_type |
|
recordid |
metadata.product_log_id |
|
|
metadata.product_name |
The metadata.product_name UDM field is set to CASB . |
|
metadata.vendor_name |
The metadata.vendor_name UDM field is set to Zscaler . |
sender |
network.email.from |
If the sender log field value matches the regular expression pattern (^.*@.*$) , then the sender log field is mapped to the network.email.from UDM field. |
extrecptnames |
network.email.to |
For index in extrecptnames , the index is mapped to the network.email.to UDM field. |
internal_recptnames |
network.email.to |
For index in internal_recptnames , the index is mapped to the network.email.to UDM field. |
external_recptnames |
network.email.to |
For index in external_recptnames , the index is mapped to the network.email.to UDM field. |
intrecptnames |
network.email.to |
For index in intrecptnames , the index is mapped to the network.email.to UDM field. |
applicationname |
principal.application |
If the applicationname log field value is not empty, then the applicationname log field is mapped to the principal.application UDM field.Else, the appname log field is mapped to the principal.application UDM field. |
src_ip |
principal.ip |
|
fullurl |
principal.url |
If the fullurl log field is not empty and the fullurl log field value is not equal to Unknown URL , then the fullurl log field is mapped to the principal.url UDM field. |
is_admin_act |
principal.user.attribute.labels[is_admin_act] |
|
|
principal.user.attribute.roles.type |
If the is_admin_act log field value is equal to 1 , then the principal.user.attribute.roles.type UDM field is set to ADMINISTRATOR . |
company |
principal.user.company_name |
|
department |
principal.user.department |
|
dept |
principal.user.department |
|
user |
principal.user.email_addresses |
If the user log field value matches the regular expression pattern (^.*@.*$) , then the user log field is mapped to the principal.user.email_addresses UDM field. |
username |
principal.user.email_addresses |
If the username log field value matches the regular expression pattern (^.*@.*$) , then the username log field is mapped to the principal.user.email_addresses UDM field. |
owner |
principal.user.email_addresses |
If the owner log field value matches the regular expression pattern (^.*@.*$) , then the owner log field is mapped to the principal.user.email_addresses UDM field. |
login |
principal.user.email_addresses |
If the login log field value matches the regular expression pattern (^.*@.*$) , then the login log field is mapped to the principal.user.email_addresses UDM field. |
login |
principal.user.userid |
If the login log field value does not match the regular expression pattern ^.+@.+$ , then the login log field is mapped to the principal.user.userid UDM field. |
malware |
security_result.associations.name |
|
|
security_result.associations.type |
If the malware log field value is not empty, then the security_result.associations.type UDM field is set to MALWARE . |
dlpdictnames |
security_result.detection_fields[dlpdictnames] |
|
dlpidentifier |
security_result.detection_fields[dlpidentifier] |
|
filedownloadtimems |
additional.fields[filedownloadtimems] |
|
malwareclass |
security_result.detection_fields[malwareclass] |
|
msgid |
security_result.detection_fields[msgid] |
|
oattchcomponentfilenames |
security_result.detection_fields[oattchcomponentfilenames] |
|
obucketname |
security_result.detection_fields[obucketname] |
|
obucketowner |
security_result.detection_fields[obucketowner] |
|
ochannel_name |
security_result.detection_fields[ochannel_name] |
|
ocollabnames |
security_result.detection_fields[ocollabnames] |
|
odlpdictnames |
security_result.detection_fields[odlpdictnames] |
|
odlpenginenames |
security_result.detection_fields[odlpenginenames] |
|
oextcollabnames |
security_result.detection_fields[oextcollabnames] |
|
oexternal_collabnames |
security_result.detection_fields[oexternal_collabnames] |
|
oexternal_recptnames |
security_result.detection_fields[oexternal_recptnames] |
|
oexternalownername |
security_result.detection_fields[oexternalownername] |
|
oextownername |
security_result.detection_fields[oextownername] |
|
oextrecptnames |
security_result.detection_fields[oextrecptnames] |
|
ofile_msg_id |
security_result.detection_fields[ofile_msg_id] |
|
ofileid |
security_result.detection_fields[ofileid] |
|
ofullurl |
security_result.detection_fields[ofullurl] |
|
ohostname |
security_result.detection_fields[ohostname] |
|
ointcollabnames |
security_result.detection_fields[ointcollabnames] |
|
ointernal_collabnames |
security_result.detection_fields[ointernal_collabnames] |
|
ointernal_recptnames |
security_result.detection_fields[ointernal_recptnames] |
|
ointrecptnames |
security_result.detection_fields[ointrecptnames] |
|
omessageid |
security_result.detection_fields[omessageid] |
|
omsgid |
security_result.detection_fields[omsgid] |
|
oowner |
security_result.detection_fields[oowner] |
|
orulelabel |
security_result.detection_fields[orulelabel] |
|
osender |
security_result.detection_fields[osender] |
|
osharedchannel_hostname |
security_result.detection_fields[osharedchannel_hostname] |
|
otenant |
security_result.detection_fields[otenant] |
|
ouser |
security_result.detection_fields[ouser] |
|
any_incident |
security_result.detection_fields[any_incident] |
|
is_inbound |
security_result.detection_fields[is_inbound] |
|
policy |
security_result.rule_labels[policy] |
|
ruletype |
security_result.rule_labels[ruletype] |
|
rulelabel |
security_result.rule_name |
|
|
security_result.severity |
If the severity log field value is equal to High , then the security_result.severity UDM field is set to HIGH .Else, if the severity log field value is equal to Medium , then the security_result.severity UDM field is set to MEDIUM .Else, if the severity log field value is equal to Low , then the security_result.sevrity UDM field is set to LOW .Else, if the severity log field value is equal to Information , then the security_result.severity UDM field is set to INFORMATIONAL . |
threatname |
security_result.threat_name |
If the threatname log field value is not empty and the dlpdictcount log field value is not equal to None , then the threatname log field is mapped to the security_result.threat_name UDM field. |
filesource |
target.file.full_path |
If the filesource log field value is not empty, then the filesource log field is mapped to the target.file.full_path UDM field. |
filepath |
target.file.full_path |
If the filesource log field value is not empty, then the filesource log field is mapped to the target.file.full_path UDM field.Else if the filepath log field value is not empty, then the filepath log field is mapped to the target.file.full_path UDM field. |
lastmodtime |
target.file.last_modification_time |
If the lastmodtime log field value is not empty, then the lastmodtime log field is mapped to the target.file.last_modification_time UDM field. |
file_msg_mod_time |
target.file.last_modification_time |
If the lastmodtime log field value is not empty, then the lastmodtime log field is mapped to the target.file.last_modification_time UDM field.Else if the file_msg_mod_time log field value is not empty, then the file_msg_mod_time log field is mapped to the target.file.fullpath UDM field. |
filemd5 |
target.file.md5 |
If the filemd5 log field value is not equal to None and the filemd5 log field value matches the regular expression pattern ^[a-fA-F0-9]{32}$ , then the filemd5 log field is mapped to the target.file.md5 UDM field.Else, if the attchcomponentmd5s log field value matches the regular expression pattern ^[a-fA-F0-9]{32}$ , then the attchcomponentmd5s log field is mapped to the target.file.md5 UDM field. |
filetypename |
target.file.mime_type |
|
filename |
target.file.names |
|
attchcomponentfilenames |
target.file.names |
|
sha |
target.file.sha256 |
|
attchcomponentfilesizes |
target.file.size |
If the attchcomponentfilesizes log field value is not empty, then the attchcomponentfilesizes log field is mapped to the target.file.size UDM field. |
filesize |
target.file.size |
If the attchcomponentfilesizes log field value is not empty, then the attchcomponentfilesizes log field is mapped to the target.file.size UDM field.Else if the filesize log field value is not empty, then the filesize log field is mapped to the target.file.size UDM field. |
sharedchannel_hostname |
target.hostname |
If the hostname log field value is not empty, then the hostname log field is mapped to the target.hostname UDM field.Else if the sharedchannel_hostname log field value is not empty, then the sharedchannel_hostname log field is mapped to the target.hostname UDM field. |
hostname |
target.hostname |
If the hostname log field value is not empty, then the hostname log field is mapped to the target.hostname UDM field. |
datacentercity |
target.location.city |
|
datacentercountry |
target.location.country_or_region |
|
datacenter |
target.location.name |
|
bucketowner |
target.resource.attribute.labels[bucketowner] |
|
projectname |
target.resource.attribute.labels[projectname] |
|
bucketname |
target.resource.name |
If the bucketname log field value is not empty, then the bucketname log field is mapped to the target.resource.name UDM field. |
objnames1 |
target.resource.name |
If the objnames1 log field value is not empty, then the objnames1 log field is mapped to the target.resource.name UDM field. |
objectname |
target.resource.name |
If the objectname log field value is not empty, then the objectname log field is mapped to the target.resource.name UDM field. |
reponame |
target.resource.name |
If the reponame log field value is not empty, then the reponame log field is mapped to the target.resource.name UDM field. |
object_name_1 |
target.resource.name |
If the object_name_1 log field value is not empty, then the object_name_1 log field is mapped to the target.resource.name UDM field. |
bucketid |
target.resource.product_object_id |
|
objtypename1 |
target.resource.resource_subtype |
If the objtypename1 log field value is not empty, then the objtypename1 log field is mapped to the target.resource.resource_subtype UDM field. |
objecttype |
target.resource.resource_subtype |
If the objecttype log field value is not empty, then the objecttype log field is mapped to the target.resource.resource_subtype UDM field. |
object_type |
target.resource.resource_subtype |
|
|
target.resource.resource_type |
If the bucketname log field value is not empty, then the target.resource.resource_type UDM field is set to STORAGE_BUCKET .If the reponame log field value is not empty, then the target.resource.resource_type UDM field is set to REPOSITORY . |
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