SSL Forward Proxy Decryption Profile
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Next-Generation Firewall Docs
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PAN-OS 9.1 (EoL)
- PAN-OS 11.1 & Later
- PAN-OS 11.0 (EoL)
- PAN-OS 10.2
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- PAN-OS 9.1 (EoL)
- Cloud Management of NGFWs
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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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- Panorama Web Interface Access Privileges
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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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- Configure the Master Key
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- Configure an SSL/TLS Service Profile
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- Configure the Key Size for SSL Forward Proxy Server 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
- Use Case: Configure Active/Active HA with Floating IP Addresses
- Use Case: Configure Active/Active HA with ARP Load-Sharing
- Use Case: Configure Active/Active HA with Floating IP Address Bound to Active-Primary Firewall
- Use Case: Configure Active/Active HA with Source DIPP NAT Using Floating IP Addresses
- Use Case: Configure Separate Source NAT IP Address Pools for Active/Active HA Firewalls
- Use Case: Configure Active/Active HA for ARP Load-Sharing with Destination NAT
- Use Case: Configure Active/Active HA for ARP Load-Sharing with Destination NAT in Layer 3
- Refresh HA1 SSH Keys and Configure Key Options
- HA Firewall States
- Reference: HA Synchronization
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- Use the Dashboard
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- Report Types
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- User-ID Overview
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- App-ID Overview
- App-ID and HTTP/2 Inspection
- Manage Custom or Unknown Applications
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- Apply Tags to an Application Filter
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- Safely Enable Applications on Default Ports
- Applications with Implicit Support
- Application Level Gateways
- Disable the SIP Application-level Gateway (ALG)
- Maintain Custom Timeouts for Data Center Applications
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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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- Prevent Brute Force Attacks
- Customize the Action and Trigger Conditions for a Brute Force Signature
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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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- Plan Your URL Filtering Deployment
- URL Filtering Best Practices
- Activate The Advanced URL Filtering Subscription
- Configure URL Filtering
- Test URL Filtering Configuration
- 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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- Virtual Routers
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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
- Dynamic DNS Overview
- Configure Dynamic DNS for Firewall Interfaces
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- NAT Rule Capacities
- Dynamic IP and Port NAT Oversubscription
- Dataplane NAT Memory Statistics
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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
- Enforce Policy Rule Description, Tag, and Audit Comment
- 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
- Configure an Interface as a DHCPv4 Client
- 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
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- NAT Rule Capacities
- Dynamic IP and Port NAT Oversubscription
- Dataplane NAT Memory Statistics
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- 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
- Configure Routed Layer 3 Security Chains
- Network Packet Broker HA Support
- User Interface Changes for Network Packet Broker
- Limitations of Network Packet Broker
- Troubleshoot Network Packet Broker
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- Enable Advanced Routing
- Logical Router Overview
- Configure a Logical Router
- Create a Static Route
- Configure BGP on an Advanced Routing Engine
- Create BGP Routing Profiles
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- Create OSPF Routing Profiles
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- Create OSPFv3 Routing Profiles
- Configure RIPv2 on an Advanced Routing Engine
- Create RIPv2 Routing Profiles
- Create BFD Profiles
- Configure IPv4 Multicast
- Configure MSDP
- Create Multicast Routing Profiles
- Create an IPv4 MRoute
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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
- PAN-OS 10.1
- PAN-OS 10.0 (EoL)
- PAN-OS 9.1 (EoL)
- PAN-OS 9.0 (EoL)
- PAN-OS 8.1 (EoL)
- Cloud Management and AIOps for NGFW
End-of-Life (EoL)
SSL Forward Proxy Decryption Profile
The SSL Forward Proxy Decryption profile blocks risky
outbound sessions, verifies certificates, and provides session failure
checks.
The SSL Forward Proxy Decryption profile (ObjectsDecryption ProfileSSL DecryptionSSL Forward Proxy)
controls the server verification, session mode checks, and failure
checks for outbound traffic defined in SSL Forward Proxy Decryption
policies to which you attach the profile. The following figure shows
the general best practice recommendations for SSL Forward Proxy
Decryption profile settings, but the settings you use also depend
on your company’s security compliance rules and local laws and regulations.
There are also specific best practices for perimeter internet gateway decryption profiles and
for data center decryption profiles.
Because the firewall is a proxy device, SSL Forward Proxy
Decryption cannot decrypt some sessions, such as sessions with client
authentication or pinned certificates. Being a proxy also means
that the firewall does not support High Availability (HA) sync for
decrypted SSL sessions.
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Server Certificate Verification:
- Block sessions with expired certificates—Always check this box to block sessions with servers that have expired certificates and prevent access to potentially insecure sites. If you don’t check this box, users can connect with and transact with potentially malicious sites and see warning messages when they attempt to connect, but the connection is not prevented.
- Block sessions with untrusted issuers—Always check this box to block sessions with servers that have untrusted certificate issuers. An untrusted issuer may indicate a man-in-the-middle attack, a replay attack, or other attack.
- Block sessions with unknown certificate status—Blocks the SSL session when a the certificate revocation status of the server returns with the status “unknown”. Because certificate status may be unknown for multiple reasons, for general decryption security, checking this box usually tightens security too much. However, in higher-security areas of the network such as the data center, checking this box makes sense.
- Block sessions on certificate status check timeout—Whether to block sessions if the status check times out depends on your company’s security compliance stance because it’s a tradeoff between tighter security and a better user experience. Certificate status verification examines the Certificate Revocation List (CRL) on a revocation server or uses Online Certificate Status Protocol (OCSP) to find out if the issuing CA has revoked the certificate and the certificate should not be trusted. However, revocation servers can be slow to respond, which can cause the session to timeout and the firewall to block the session even though the certificate may be valid. If you Block sessions on certificate status check timeout and the revocation server is slow to respond, you can use DeviceSetupSessionDecryption Settings and click Certificate Revocation Checking to change the default timeout value of five seconds to another value. For example, you could increase the timeout value to eight seconds, as shown in the following figure. Enable both CRL and OCSP certificate revocation checking because server certificates can contain the CRL URL in the CRL Distribution Point (CDP) extension or the OCSP URL in the Authority Information Access (AIA) certificate extension.
- Restrict certificate extensions—Checking this box limits the certificate extensions in the server certificate to key usage and extended key usage and blocks certificates with other extensions. However, in certain deployments, some other certificate extensions may be necessary, so only check this box if your deployment requires no other certificate extensions.
- Append certificate’s CN value to SAN extension—Checking this box ensures that when a browser requires a server certificate to use a Subject Alternative Name (SAN) and doesn’t support certificate matching based on the Common Name (CN), if the certificate doesn’t have a SAN extension, users can still access the requested web resources because the firewall adds the SAN extension (based on the CN) to the impersonation certificate.
Unsupported Mode Checks. If you don’t block sessions with unsupported
modes, users receive a warning message if they connect with potentially
unsafe servers, and they can click through that message and reach
the potentially dangerous site. Blocking these sessions protects
you from servers that use weak, risky protocol versions and algorithms:
- Block sessions with unsupported versions—When you configure the SSL Protocol Settings Decryption Profile, you specify the minimum version of SSL protocol to allow on your network to reduce the attack surface by blocking weak protocols. Always check this box to block sessions with the weak SSL protocol versions that you have chosen not to support.
- Block sessions with unsupported cipher suites—Always check this box to block sessions if the firewall doesn’t support the cipher suite specified in the SSL handshake. You configure which algorithms the firewall supports on the SSL Protocol Settings tab of the Decryption profile.
- Block sessions with client authentication—If you have no critical applications that require client authentication, block it because firewall can’t decrypt sessions that require client authentication. The firewall needs both the client and the server certificates to perform bi-directional decryption, but the firewall only knows the server certificate. This breaks decryption for client authentication sessions. When you check this box, the firewall blocks all sessions with client authentication except sessions from sites on the SSL Decryption Exclusion list (DeviceCertificate ManagementSSL Decryption Exclusion).If you don’t Block sessions with client authentication, when the firewall attempts to decrypt a session that uses client authentication, the firewall allows the session and adds an entry that contains the server URL/IP address, the application, and the Decryption profile to its Local SSL Decryption Exclusion Cache. Entries remain in the local cache for 12 hours and then age out. If the same user or a different user attempts to access the server within 12 hours using client authentication, the firewall matches the session to the SSL Decryption Exclusion Cache entry, does not attempt to decrypt the traffic, and allows the encrypted session.If the SSL Decryption Exclusion Cache becomes full, the firewall purges the oldest entries as new entries arrive. If you change the Decryption policy or profile, the firewall flushes the local exclusion cache because changing the policy or profile can change the classification outcome of the session.You may need to allow traffic on your network from other sites that use client authentication in addition to the Predefined sites on the SSL Decryption Exclusion list. Create a Decryption profile that allows sessions with client authentication. Add it to a Decryption policy rule that applies only to the server(s) that house the application. To increase security even more, you can require Multi-Factor Authentication to complete the user login process.
Failure Checks:
- Block sessions if resources not available—If you don’t block sessions when firewall processing resources aren’t available, then encrypted traffic that you want to decrypt enters the network still encrypted, risking allowing potentially dangerous connections. However, blocking sessions when firewall processing resources aren’t available may affect the user experience by making sites that users normally can reach temporarily unreachable. Whether to implement failure checks depends on your company’s security compliance stance and the importance to your business of the user experience, weighed against tighter security. Alternatively, consider using firewall models with more processing power so that you can decrypt more traffic.
- Block sessions if HSM not available—If you use a Hardware Security Module (HSM) to store your private keys, whether you use one depends on your compliance rules about where the private key must come from and how you want to handle encrypted traffic if the HSM isn’t available. For example, if your company mandates the use of an HSM for private key signing, then block sessions if the HSM isn’t available. However, if your company is less strict about this, then you can consider not blocking sessions if the HSM isn’t available. (If the HSM is down, the firewall can process decryption for sites for which it has cached the response from the HSM, but not for other sites.) The best practice in this case depends on your company’s policies. If the HSM is critical to your business, run the HSM in a high-availability (HA) pair (PAN-OS 8.1 supports two members in an HSM HA pair).