Important

Santa v0.9.21 has moved to using an Apple Configuration Profile to manage the local configuration. The old config file (/var/db/santa/config.plist) is no longer used.

Configuration

Two configuration methods can be used to control Santa: a local configuration profile and a sync server controlled configuration. There are certain options that can only be controlled with a local configuration profile and others that can only be controlled with a sync server controlled configuration. Additionally, there are options that can be controlled by both.

Local Configuration Profile

Key Value Type Description
ClientMode* Integer 1 = MONITOR, 2 = LOCKDOWN, defaults to MONITOR
FileChangesRegex* String The regex of paths to log file changes. Regexes are specified in ICU format.
WhitelistRegex* String A regex to whitelist if the binary or certificate scopes did not allow execution. Regexes are specified in ICU format.
BlacklistRegex* String A regex to blacklist if the binary or certificate scopes did not block an execution. Regexes are specified in ICU format.
EnablePageZeroProtection Bool Enable __PAGEZERO protection, defaults to YES. If this flag is set to YES, 32-bit binaries that are missing the __PAGEZERO segment will be blocked even in MONITOR mode, unless the binary is whitelisted by an explicit rule.
MoreInfoURL String The URL to open when the user clicks "More Info..." when opening Santa.app. If unset, the button will not be displayed.
EventDetailURL String See the EventDetailURL section below.
EventDetailText String Related to the above property, this string represents the text to show on the button.
UnknownBlockMessage String In Lockdown mode this is the message shown to the user when an unknown binary is blocked. If this message is not configured a reasonable default is provided.
BannedBlockMessage String This is the message shown to the user when a binary is blocked because of a rule if that rule doesn't provide a custom message. If this is not configured a reasonable default is provided.
ModeNotificationMonitor String The notification text to display when the client goes into Monitor mode. Defaults to "Switching into Monitor mode".
ModeNotificationLockdown String The notification text to display when the client goes into Lockdown mode. Defaults to "Switching into Lockdown mode".
SyncBaseURL* String The base URL of the sync server.
ClientAuthCertificateFile String If set, this contains the location of a PKCS#12 certificate to be used for sync authentication.
ClientAuthCertificatePassword String Contains the password for the PKCS#12 certificate.
ClientAuthCertificateCN String If set, this is the Common Name of a certificate in the System keychain to be used for sync authentication. The corresponding private key must also be in the keychain.
ClientAuthCertificateIssuerCN String If set, this is the Issuer Name of a certificate in the System keychain to be used for sync authentication. The corresponding private key must also be in the keychain.
ServerAuthRootsData Data If set, this is valid PEM containing one or more certificates to be used to evaluate the server's SSL chain, overriding the list of trusted CAs distributed with the OS.
ServerAuthRootsFile String The same as the above but is a path to a file on disk containing the PEM data.
MachineOwner String The machine owner.
MachineID String The machine ID.
MachineOwnerPlist String The path to a plist that contains the MachineOwnerKey / value pair.
MachineOwnerKey String The key to use on MachineOwnerPlist.
MachineIDPlist String The path to a plist that contains the MachineOwnerKey / value pair.
MachineIDKey String The key to use on MachineIDPlist.
EventLogType String Defines how event logs are stored. Options are 1) syslog: Sent to ASL or ULS (if built with the 10.12 SDK or later). 2) filelog: Sent to a file on disk. Use EventLogPath to specify a path. Defaults to filelog
EventLogPath String If EventLogType is set to filelog, EventLogPath will provide the path to save logs. Defaults to /var/db/santa/santa.log. If you change this value ensure you also update com.google.santa.newsyslog.conf with the new path.

*overridable by the sync server: run santactl status to check the current running config

EventDetailURL

When the user gets a block notification, a button can be displayed which will take them to a web page with more information about that event.

This property contains a kind of format string to be turned into the URL to send them to. The following sequences will be replaced in the final URL:

Key Description
%file_sha% SHA-256 of the file that was blocked
%machine_id% ID of the machine
%username% The executing user
%bundle_id% Bundle ID of the binary, if applicable
%bundle_ver% Bundle version of the binary, if applicable

For example: https://sync-server-hostname/%machine_id%/%file_sha%

Example Configuration Profile

Here is an example of a configuration profile that could be set. It was generated with Tim Sutton's great mcxToProfile tool. A copy is also available here.

A few key points to when creating your configuration profile:

  • com.google.santa needs to be the key inside PayloadContent
  • The PayloadScope needs to be System
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>PayloadContent</key>
    <array>
        <dict>
            <key>PayloadContent</key>
            <dict>
                <key>com.google.santa</key>
                <dict>
                    <key>Forced</key>
                    <array>
                        <dict>
                            <key>mcx_preference_settings</key>
                            <dict>
                                <key>BannedBlockMessage</key>
                                <string>This application has been banned</string>
                                <key>ClientMode</key>
                                <integer>1</integer>
                                <key>EnablePageZeroProtection</key>
                                <false/>
                                <key>EventDetailText</key>
                                <string>Open sync server</string>
                                <key>EventDetailURL</key>
                                <string>https://sync-server-hostname/blockables/%file_sha%</string>
                                <key>FileChangesRegex</key>
                                <string>^/(?!(?:private/tmp|Library/(?:Caches|Managed Installs/Logs|(?:Managed )?Preferences))/)</string>
                                <key>MachineIDKey</key>
                                <string>MachineUUID</string>
                                <key>MachineIDPlist</key>
                                <string>/Library/Preferences/com.company.machine-mapping.plist</string>
                                <key>MachineOwnerKey</key>
                                <string>Owner</string>
                                <key>MachineOwnerPlist</key>
                                <string>/Library/Preferences/com.company.machine-mapping.plist</string>
                                <key>ModeNotificationLockdown</key>
                                <string>Entering Lockdown mode</string>
                                <key>ModeNotificationMonitor</key>
                                <string>Entering Monitor mode&lt;br/&gt;Please be careful!</string>
                                <key>MoreInfoURL</key>
                                <string>https://sync-server-hostname/moreinfo</string>
                                <key>SyncBaseURL</key>
                                <string>https://sync-server-hostname/api/santa/</string>
                                <key>UnknownBlockMessage</key>
                                <string>This application has been blocked from executing.</string>
                            </dict>
                        </dict>
                    </array>
                </dict>
            </dict>
            <key>PayloadEnabled</key>
            <true/>
            <key>PayloadIdentifier</key>
            <string>0342c558-a101-4a08-a0b9-40cc00039ea5</string>
            <key>PayloadType</key>
            <string>com.apple.ManagedClient.preferences</string>
            <key>PayloadUUID</key>
            <string>0342c558-a101-4a08-a0b9-40cc00039ea5</string>
            <key>PayloadVersion</key>
            <integer>1</integer>
        </dict>
    </array>
    <key>PayloadDescription</key>
    <string>com.google.santa</string>
    <key>PayloadDisplayName</key>
    <string>com.google.santa</string>
    <key>PayloadIdentifier</key>
    <string>com.google.santa</string>
    <key>PayloadOrganization</key>
    <string></string>
    <key>PayloadRemovalDisallowed</key>
    <true/>
    <key>PayloadScope</key>
    <string>System</string>
    <key>PayloadType</key>
    <string>Configuration</string>
    <key>PayloadUUID</key>
    <string>9020fb2d-cab3-420f-9268-acca4868bdd0</string>
    <key>PayloadVersion</key>
    <integer>1</integer>
</dict>
</plist>

Configuration profiles have a .mobileconfig file extension. There are many ways to install configuration profiles:

  • Double click them in Finder
  • Use the /usr/bin/profiles tool
  • Use an MDM

Sync server Provided Configuration

Key Value Type Description
client_mode String MONITOR or LOCKDOWN, defaults to MONITOR.
clean_sync** Bool If set to True Santa will clear all local rules and download a fresh copy from the sync-server. Defaults to False.
batch_size Integer The number of rules to download or events to upload per request. Multiple requests will be made if there is more work than can fit in single request. Defaults to 50.
upload_logs_url** String If set, the endpoint to send Santa's current logs. No default.
whitelist_regex String Same as the "Local Configuration" WhitelistRegex. No default.
blacklist_regex String Same as the "Local Configuration" BlacklistRegex. No default.
fcm_token* String The FCM token used by Santa to listen for FCM messages. Unique for every machine. No default.
fcm_full_sync_interval* Integer The full sync interval if a fcm_token is set. Defaults to 14400 secs (4 hours).
fcm_global_rule_sync_deadline* Integer The max time to wait before performing a rule sync when a global rule sync FCM message is received. This allows syncing to be staggered for global events to avoid spikes in server load. Defaults to 600 secs (10 min).
bundles_enabled* Bool If set to True the bundle scanning feature is enabled. Defaults to False.

*Held only in memory. Not persistent upon process restart.

**Performed once per preflight run (if set).