Configure 5G Subscriber ID Security

Configure 5G subscriber ID security.
After you’ve read about 5G Equipment ID and Subscriber ID Security, prepare to configure subscriber ID security. Gather the IP addresses of the following devices in your topology so that you can use these addresses in Security policy rules controlling traffic to and from these devices:
  • gNodeB (gNB)
  • Access and Mobility Management Function (AMF)
  • Session Management Function (SMF)
  • User Plane Function (UPF)
  1. Enable GTP security.
    1. Select
      Device
      Setup
      Management
      General Settings
      . Select
      GTP Security
      .
    2. Click
      OK
      .
    3. Commit
      the change.
    4. Select
      Device
      Setup
      Operations
      and
      Reboot Device
      .
  2. Enable inspection of 5G HTTP/2 control packets; create a Mobile Network Protection profile.
    1. Select
      Objects
      Security Profiles
      Mobile Network Protection
      .
    2. Add
      a profile by
      Name
      , for example, 5G Mobile security.
    3. Enter a
      Description
      .
    4. On the
      GTP Inspection
      tab, select
      5G-C
      .
    5. Enable
      5G-HTTP2
      to enable inspection of 5G HTTP/2 control packets.
      5g-http2-checkbox.png
    6. Select
      GTP-U
      and enable
      GTP-U Content Inspection
      to correlate context from 5G HTTP/2 control packets (Subscriber IDs and Equipment IDs) to IP user traffic inside a GTP-U tunnel.
    7. Select
      Filtering Options
      and
      RAT Filtering
      ; for example, you can allow
      NR
      (New Radio) and block other RATs.
      5g-rat-filter.png
    8. (
      Optional
      ) Select
      Other Log Settings
      and
      Log User Location
      .
    9. (
      Optional
      ) To troubleshoot, select
      Other Log Settings
      and select 5G Allowed Messages
      N11
      (the HTTP/2 control messages). You can also enable GTP-U Allowed Messages for
      Tunnel Management
      ,
      Path Management
      , and
      G-PDU
      .
    10. Click
      OK
      .
  3. Create address objects for the IP addresses assigned to the network elements in your topology, such as the AMF on the N11 interface, the gNB on the N3 interface, the SMF on the N11 interface, and the UPF on the N3 interface.
  4. (
    Optional
    ) Create an External Dynamic List (EDL) of Type
    Subscriber Identity List
    ; the
    Source
    of the list provides access to a server that provides identifiers of IoT devices connected to the 5G network, for which you want to allow (or deny) traffic.
  5. Create a Security policy rule that applies your Mobile Network Protection profile to application traffic.
    1. Select
      Policies
      Security
      and
      Add
      a Security policy rule by
      Name
      .
    2. Select
      Source
      tab and
      Add
      a
      Source Zone
      or select
      Any
      .
    3. For
      Source Address
      ,
      Add
      the address objects for the 5G element endpoints on the N3 and N11 interfaces that you want to allow.
      5g-sec-pol-sources.png
    4. For
      Destination
      ,
      Add
      the
      Destination Address
      address objects for the 5G element endpoints on the N3 and N11 interfaces that you want to allow (the same ones you allowed for Source Address).
    5. Add
      the
      Applications
      to allow, such as the user plane, which is
      gtp-u
      and
      web-browsing
      , which has HTTP/2.
    6. On the
      Actions
      tab, select the
      Action
      , such as
      Allow
      .
    7. Select the
      Mobile Network Protection
      profile you created.
    8. Select other profiles you want to apply, such as
      Vulnerability Protection
      .
    9. Select Log Settings, such as
      Log at Session Start
      and
      Log at Session End
      .
    10. Click
      OK
      .
  6. Create another Security policy rule based on Subscriber ID.
    1. Select
      Policies
      Security
      and
      Add
      a Security policy rule by
      Name
      , for example, Equipment ID Security.
    2. Select
      Source
      tab and
      Add
      a
      Source Zone
      or select
      Any
      .
    3. Add
      one or more
      Source Subscriber
      IDs in any of the following formats (if you configured an EDL, specify that EDL in this step):
      • 5G Subscriber Permanent Identifier (SUPI) including IMSI
      • IMSI (14 or 15 digits)
      • Range of IMSI values separated by a hyphen. In a range, only the 11th digit through the 15th digit of the IMSI can change from the start of the range to the end of the range; for example, 111111111111122-111111111119999.
      • IMSI prefix of six digits, with an asterisk (*) as the wildcard after the prefix
      • EDL that specifies IMSIs
      5g-equipment-id-edl.png
    4. (
      Optional
      ) You can add
      Source Equipment
      and
      Network Slice
      names to this Security policy rule to make the rule more restrictive.
    5. Specify
      Destination Zone
      ,
      Destination Address
      , and
      Destination Device
      as
      Any
      .
    6. Add
      the
      Applications
      to allow, for example,
      ssh
      ,
      ssl
      ,
      radmin
      , and
      telnet
      .
    7. On the
      Actions
      tab, select the
      Action
      , such as
      Allow
      .
    8. Select profiles you want to apply, such as
      Antivirus
      ,
      Vulnerability Protection
      , and
      Anti-Spyware
      .
    9. Select Log Settings, such as
      Log at Session Start
      and
      Log at Session End
      .
    10. Click
      OK
      .
  7. Commit
    .

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