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PlantUML
border1
titleWeb UI SSO Flow (SAML)
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autonumber
participant "Browser" as cli
participant "WebUI\n(eg NN UI)" as ui #chartreuse
participant "Knox\nTS/SSO" as sso #chartreuse
participant "SAML\nIdP" as idp
 
activate cli
cli -> ui: /view.GET()
note right: User/browser makes request to UI without valid token
  activate ui
  cli <->- ui: /view.GET(redirect302(SSO:/login,ui-origin-url)
  activate ui
  note right: AuthFilter in UI detectes no/invalid token redirects to KnoxTS/SSO preserving ui-origin-url
  deactivate ui
cli <--> uisso: redirect302(SSO:/login,ui-origin-url.GET()
  deactivate ui
note right: Browser follows redirect. Knox finds no/invalid token,\nredirects to IdP preserving ui-origin-url and ts-origin-url 
  activate sso
  cli <->- ssoui: /login.GET(redirect302(IdP:/login,ui-origin-url,ts-origin-url)
  activate sso
  note right: Knox forwards request to SAML IdP preserving origin URLs
  deactivate sso
cli <--> uiidp: redirect302(IdP:/login,ui-origin-url,ts-origin-url/login.GET()
  deactivate sso
note right: Browser follows redirect
  activate idp
  cli <->- idp: /login.GETok200(form)
  activate idp
  note right: "SAML IdP presents login form to user"
  deactivate idp
cli <--> idp: ok200(form)
  deactivate idp/login.POST(username,password)
note right: User provides credentials to IdP via login form
  activate idp
  cli <->- idp: redirect302(SSO:/login.POST(username,password,saml-bearer-token,ts-origin-url)
  activate idp
  note right: IdP redirects back to Knox with SAML Bearer token in headers
  deactivate idp
cli <--> idpsso: redirect302(SSO:/login,.GET(saml-bearer-token,tsui-origin-url)
  deactivate idp
note right: Knox converts SAML Bearer Token to a normalized JWT Bearer Token
  activate sso
  cli <->- sso: /login.GET(saml-bearer-token,redirect302(ui-origin-url):jwt-bearer-token-cookie
  activate sso
  note right: Knox redirects client back to ui-origin-url with JWT Bearer token in cookie
  deactivate sso
cli <--> ssoui: redirect302(ui-origin-url):/view.GET(jwt-bearer-token-cookie)
  deactivate sso
note right: Browser follows redirect to ui-origin-url with JWT Bearer Token in cookie.\nJWT Bearer Token validated by AuthFilter
  activate ui
  cli <-> ui: /view.GET(jwt-bearer-token-cookie)
  activate ui
  ok200(response)
  note right: Response returned to client.
  cli <- ui: ok200(response)
  deactivate ui
deactivate cli
 

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