SSL Protocol Settings Decryption Profile
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Next-Generation Firewall Docs
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PAN-OS 9.1 (EoL)
- PAN-OS 11.1 & Later
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- Management Interfaces
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- Launch the Web Interface
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- Define Access to the Web Interface Tabs
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- Reset the Firewall to Factory Default Settings
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- Plan Your Authentication Deployment
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- Keys and Certificates
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- HA Overview
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- Prerequisites for Active/Active HA
- Configure Active/Active HA
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- Use Case: Configure Active/Active HA with Route-Based Redundancy
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- Use Case: Configure Active/Active HA with Source DIPP NAT Using Floating IP Addresses
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- Use Case: Configure Active/Active HA for ARP Load-Sharing with Destination NAT in Layer 3
- Refresh HA1 SSH Keys and Configure Key Options
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- Reference: HA Synchronization
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- User-ID Overview
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- App-ID Overview
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- Apply Tags to an Application Filter
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- Best Practices for Securing Your Network from Layer 4 and Layer 7 Evasions
- Set Up Antivirus, Anti-Spyware, and Vulnerability Protection
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- Decryption Overview
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- Keys and Certificates for Decryption Policies
- SSL Forward Proxy
- SSL Forward Proxy Decryption Profile
- SSL Inbound Inspection
- SSL Inbound Inspection Decryption Profile
- SSL Protocol Settings Decryption Profile
- SSH Proxy
- SSH Proxy Decryption Profile
- Decryption Profile for No Decryption
- SSL Decryption for Elliptical Curve Cryptography (ECC) Certificates
- Perfect Forward Secrecy (PFS) Support for SSL Decryption
- SSL Decryption and Subject Alternative Names (SANs)
- High Availability Support for Decrypted Sessions
- Decryption Mirroring
- Configure SSL Forward Proxy
- Configure SSL Inbound Inspection
- Configure SSH Proxy
- Configure Server Certificate Verification for Undecrypted Traffic
- Enable Users to Opt Out of SSL Decryption
- Temporarily Disable SSL Decryption
- Configure Decryption Port Mirroring
- Verify Decryption
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- How Decryption Broker Works
- Layer 3 Security Chain Guidelines
- Configure Decryption Broker with One or More Layer 3 Security Chain
- Transparent Bridge Security Chain Guidelines
- Configure Decryption Broker with a Single Transparent Bridge Security Chain
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- Activate Free Licenses for Decryption Features
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- About Palo Alto Networks URL Filtering Solution
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- URL Filtering Best Practices
- Activate The Advanced URL Filtering Subscription
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- Log Only the Page a User Visits
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- Tap Interfaces
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- Layer 2 and Layer 3 Packets over a Virtual Wire
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- DNS Overview
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- Dynamic DNS Overview
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- NAT Rule Capacities
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- Translate Internal Client IP Addresses to Your Public IP Address (Source DIPP NAT)
- Enable Clients on the Internal Network to Access your Public Servers (Destination U-Turn NAT)
- Enable Bi-Directional Address Translation for Your Public-Facing Servers (Static Source NAT)
- Configure Destination NAT with DNS Rewrite
- Configure Destination NAT Using Dynamic IP Addresses
- Modify the Oversubscription Rate for DIPP NAT
- Reserve Dynamic IP NAT Addresses
- Disable NAT for a Specific Host or Interface
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- Policy Types
- Policy Objects
- Track Rules Within a Rulebase
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- Move or Clone a Policy Rule or Object to a Different Virtual System
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- External Dynamic List
- Built-in External Dynamic Lists
- Configure the Firewall to Access an External Dynamic List
- Retrieve an External Dynamic List from the Web Server
- View External Dynamic List Entries
- Exclude Entries from an External Dynamic List
- Enforce Policy on an External Dynamic List
- Find External Dynamic Lists That Failed Authentication
- Disable Authentication for an External Dynamic List
- Register IP Addresses and Tags Dynamically
- Use Dynamic User Groups in Policy
- Use Auto-Tagging to Automate Security Actions
- CLI Commands for Dynamic IP Addresses and Tags
- Application Override Policy
- Test Policy Rules
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PAN-OS 11.1 & Later
- PAN-OS 11.1 & Later
- PAN-OS 11.0 (EoL)
- PAN-OS 10.2
- PAN-OS 10.1
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- Tap Interfaces
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- Layer 2 and Layer 3 Packets over a Virtual Wire
- Port Speeds of Virtual Wire Interfaces
- LLDP over a Virtual Wire
- Aggregated Interfaces for a Virtual Wire
- Virtual Wire Support of High Availability
- Zone Protection for a Virtual Wire Interface
- VLAN-Tagged Traffic
- Virtual Wire Subinterfaces
- Configure Virtual Wires
- Configure a PPPoE Client on a Subinterface
- Configure an IPv6 PPPoE Client
- Configure an Aggregate Interface Group
- Configure Bonjour Reflector for Network Segmentation
- Use Interface Management Profiles to Restrict Access
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- DHCP Overview
- Firewall as a DHCP Server and Client
- Firewall as a DHCPv6 Client
- DHCP Messages
- Dynamic IPv6 Addressing on the Management Interface
- Configure an Interface as a DHCP Server
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- Configure an Interface as a DHCPv6 Client with Prefix Delegation
- Configure the Management Interface as a DHCP Client
- Configure the Management Interface for Dynamic IPv6 Address Assignment
- Configure an Interface as a DHCP Relay Agent
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- DNS Overview
- DNS Proxy Object
- DNS Server Profile
- Multi-Tenant DNS Deployments
- Configure a DNS Proxy Object
- Configure a DNS Server Profile
- Use Case 1: Firewall Requires DNS Resolution
- Use Case 2: ISP Tenant Uses DNS Proxy to Handle DNS Resolution for Security Policies, Reporting, and Services within its Virtual System
- Use Case 3: Firewall Acts as DNS Proxy Between Client and Server
- DNS Proxy Rule and FQDN Matching
-
- NAT Rule Capacities
- Dynamic IP and Port NAT Oversubscription
- Dataplane NAT Memory Statistics
-
- Translate Internal Client IP Addresses to Your Public IP Address (Source DIPP NAT)
- Create a Source NAT Rule with Persistent DIPP
- PAN-OS
- Strata Cloud Manager
- Enable Clients on the Internal Network to Access your Public Servers (Destination U-Turn NAT)
- Enable Bi-Directional Address Translation for Your Public-Facing Servers (Static Source NAT)
- Configure Destination NAT with DNS Rewrite
- Configure Destination NAT Using Dynamic IP Addresses
- Modify the Oversubscription Rate for DIPP NAT
- Reserve Dynamic IP NAT Addresses
- Disable NAT for a Specific Host or Interface
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- Network Packet Broker Overview
- How Network Packet Broker Works
- Prepare to Deploy Network Packet Broker
- Configure Transparent Bridge Security Chains
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- Enable Advanced Routing
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PAN-OS 11.2
- PAN-OS 11.2
- PAN-OS 11.1
- PAN-OS 11.0 (EoL)
- PAN-OS 10.2
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- PAN-OS 9.0 (EoL)
- PAN-OS 8.1 (EoL)
- Cloud Management and AIOps for NGFW
End-of-Life (EoL)
SSL Protocol Settings Decryption Profile
The SSL Protocol Settings define the protocols and the
key exchange, encryption, and authentication algorithms that the
firewall accepts for outbound SSL Forward Proxy and inbound SSL
Inbound Inspection traffic.
The SSL Protocol Settings (ObjectsDecryption ProfileSSL DecryptionSSL Protocol Settings) control
whether you allow vulnerable SSL/TLS protocol versions, weak encryption
algorithms, and weak authentication algorithms. SSL Protocol Settings
apply to outbound SSL Forward Proxy and inbound SSL Inbound Inspection
traffic. These settings don’t apply to SSH Proxy traffic or to traffic
that you don’t decrypt.
The following figure shows the general best practice recommendations
for SSL Protocol Settings. There are also specific best practices
for perimeter internet gateway decryption profiles and
for data center decryption profiles.
When you configure SSL Protocol Settings
for SSL Inbound Inspection traffic, create separate profiles for
servers with different security capabilities. For example, if one
set of servers supports only RSA, the SSL Protocol Settings only
need to support RSA. However, the SSL Protocol Settings for servers that
support PFS should support PFS. Configure SSL Protocol Settings
for the highest level of security that the target server you are
protecting supports, but check performance to ensure that the firewall
resources can handle the higher processing load that higher security
protocols and algorithms require.
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Protocol Versions:
- Set the Min Version to TLSv1.2 to provide the strongest security—business sites that value security support TLSv1.2. If a site (or a category of sites) only supports weaker ciphers, review the site and determine if it really houses a legitimate business application. If it does, make an exception for only that site by configuring a Decryption profile with a Min Version that matches the strongest cipher the site supports and then applying the profile to a Decryption policy rule that limits allowing the weak cipher to only the site or sites in question. If the site doesn’t house a legitimate business application, don’t weaken your security posture to support the site—weak protocols (and ciphers) contain known vulnerabilities that attackers can exploit. If the site belongs to a category of sites that you don’t need for business purposes, use URL Filtering to block access to the entire category. Don’t support weak encryption or authentication algorithms unless you must do so to support important legacy sites, and when you make exceptions, create a separate Decryption profile that allows the weaker protocol just for those sites. Don’t downgrade the main Decryption profile that you apply to most sites to TLSv1.1 just to accommodate a few exceptions.Qualys SSL Labs SSL Pulse web page provides up-to-date statistics on the percentages of different ciphers and protocols in use on the 150,000 most popular sites in the world so you can see trends and understand how widespread worldwide support is for more secure ciphers and protocols.
- Set the Max Version to Max rather than to a particular version so that as the protocols improve, the firewall automatically supports the newest and best protocols. Whether you intend to attach a Decryption profile to a Decryption policy rule that governs inbound (SSL Inbound Inspection) or outbound (SSL Forward Proxy) traffic, avoid allowing weak algorithms.
Key Exchange Algorithms: Leave all three boxes checked (default)
to support both RSA and PFS (DHE
and ECDHE) key exchanges.
To support HTTP/2 traffic, you
must leave the ECDHE box checked.
Encryption Algorithms: When you set the protocol version to TLSv1.2,
the older, weaker 3DES and RC4 algorithms are automatically unchecked
(blocked). For any traffic for which you must allow a weaker TLS
protocol, create a separate Decryption profile and apply it only
to traffic for that site, and uncheck the 3DES and RC4 boxes. Do
not allow traffic that uses the 3DES or RC4 algorithms. If unchecking the
3DES or RC4 boxes prevents you from accessing a site that you must
use for business, create a separate Decryption profile for that
site. Don’t weaken decryption for any other sites.
Authentication Algorithms: The older, weaker MD5 algorithm is
automatically unchecked (blocked). Do not allow MD5 authenticated
traffic on your network; SHA1 is the weakest authentication algorithm
you should allow. If no necessary sites use SHA1, uncheck the box
and block traffic to further reduce the attack surface.