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Proof Key for Code Exchange


    +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
    | End Device (e.g., Smartphone)  |
    |                                |
    | +-------------+   +----------+ | (6) Access Token  +----------+
    | |Legitimate   |   | Malicious|<--------------------|          |
    | |OAuth 2.0 App|   | App      |-------------------->|          |
    | +-------------+   +----------+ | (5) Authorization |          |
    |        |    ^          ^       |        Grant      |          |
    |        |     \         |       |                   |          |
    |        |      \   (4)  |       |                   |          |
    |    (1) |       \  Authz|       |                   |          |
    |   Authz|        \ Code |       |                   |  Authz   |
    | Request|         \     |       |                   |  Server  |
    |        |          \    |       |                   |          |
    |        |           \   |       |                   |          |
    |        v            \  |       |                   |          |
    | +----------------------------+ |                   |          |
    | |                            | | (3) Authz Code    |          |
    | |     Operating System/      |<--------------------|          |
    | |         Browser            |-------------------->|          |
    | |                            | | (2) Authz Request |          |
    | +----------------------------+ |                   +----------+
    +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+

             Figure 1: Authorization Code Interception Attack

1.1.  Protocol Flow

                                                 +-------------------+
                                                 |   Authz Server    |
       +--------+                                | +---------------+ |
       |        |--(A)- Authorization Request ---->|               | |
       |        |       + t(code_verifier), t_m  | | Authorization | |
       |        |                                | |    Endpoint   | |
       |        |<-(B)---- Authorization Code -----|               | |
       |        |                                | +---------------+ |
       | Client |                                |                   |
       |        |                                | +---------------+ |
       |        |--(C)-- Access Token Request ---->|               | |
       |        |          + code_verifier       | |    Token      | |
       |        |                                | |   Endpoint    | |
       |        |<-(D)------ Access Token ---------|               | |
       +--------+                                | +---------------+ |
                                                 +-------------------+

                     Figure 2: Abstract Protocol Flow


#pkce (1) #security (1) #auth (1) #oauth2 (1)
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