SIP Identity Verification via Dialog Subscription Requests
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Solution Overview
Problem
SIP networks face security risks due to registration hijacking, where attackers can forge sender identification information in INVITE messages, leading to unauthorized modifications of contact addresses and session initiation.
Innovation Solution
Implementing a method and system for SIP user identity verification by sending a subscription request with dialog identification information to the user agent identified in the INVITE message, allowing verification of the sender's identity through a dialog event package, thereby preventing unauthorized session establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If SIP registration allows arbitrary modification of the From header field, then ease of operation is improved, but security reliability deteriorates due to registration hijacking
Solution Approach 1:
The system performs preliminary identity verification by sending a subscription request to the sender's user agent before allowing session establishment. This advance verification checks whether the sender's user agent recognizes the dialog identification information, preventing registration hijacking before it can occur.
Solution Approach 2:
The system implements a feedback mechanism where a subscription request is sent to the sender's user agent, and the response to this subscription request is used to verify the sender's identity. This closed-loop feedback ensures that only authenticated senders can establish sessions.
2Adaptability or versatility
If sender identification information can be modified arbitrarily, then adaptability is improved, but vulnerability to harmful factors increases due to forged identities
Solution Approach 1:
The system performs preliminary identity verification by sending a subscription request to the sender's user agent before allowing session establishment. This advance verification checks whether the sender's user agent recognizes the dialog identification information, preventing registration hijacking before it can occur.
Solution Approach 2:
The system introduces an intermediary verification mechanism using dialog identification information and subscription requests. This intermediary layer mediates between the sender's arbitrary header modifications and the network's security requirements, verifying authenticity without restricting operational flexibility.
3Reliability
If identity verification is implemented through subscription requests, then security reliability is improved, but device complexity increases
Solution Approach 1:
The system uses the existing SIP subscription request mechanism, which is already a standard component of SIP protocols. By making the verification system multi-functional (using existing infrastructure for both normal operations and security verification), it avoids adding significant complexity while maintaining high reliability.
Data Source
AI summary
Methods, systems, and computer readable media for verifying the identity of a SIP user seeking to establish a session are disclosed. Methods for verifying the identity of a SIP user seeking to establish a session described herein may be performed at a computing platform that includes a SIP user agent. According to one method, an INVITE message for establishing a session is received, where the INVITE message includes sender identification information and dialog identification information. In response to receiving the INVITE message, a subscription request including the dialog identification information is sent to a second computing platform that includes a user agent identified by the sender identification information in the INVITE message. A response to the subscription request is received and, based on the response to the subscription request, it is determined whether the identity of the sender of the INVITE message can be verified.