AUTH::authenticate_continue

Description

Continues an authentication operation by providing the specified string as the credential response for the most recent authorization prompt.
This command is only available when the event AUTH_WANTCREDENTIAL is the most recent event generated, and no AUTH::credential commands have been issued since the event, for the specified authentication ID. Unlike the AUTH::credential commands, the string credential provided by this command does not get cached, even if the desired credential type had been identified (see the AUTH::wantcredential_type command).
This command is especially useful in providing authentication services to interactive protocols (such as telnet, ftp, and so on), where the actual text prompts and responses might be directly communicated with the remote user.

Syntax

AUTH::authenticate_continue <authid> <string>

AUTH::authenticate_continue <authid> <string>

  • Continues an authentication operation by providing the specified string as the credential response for the most recent authorization prompt.

Examples

The example below is less efficient than the builtin system auth rules, and should be considered only a demonstration of AUTH::authenticate_continue. The AUTH::authenticate_continue command serves limited purpose at this time since as of this writing, the authentication modules present on BIG-IP are primarily username/password based. Since the authentication credential prompts are well-known, one can always provide the credentials in advance of calling AUTH::authenticate.
when CLIENT_ACCEPTED {
    set auth_stage 0
}
when HTTP_REQUEST {
    if {$auth_stage > 0} {
        return
    }
    set auth_sid [AUTH::start pam some_interactive_pam_auth_service]
    set http_username [HTTP::username]
    set http_password [HTTP::password]
    AUTH::authenticate $auth_sid
    HTTP::collect
}
when AUTH_RESULT {
    set auth_status [AUTH::status]
    if {$auth_status == 0} {
        incr auth_stage
        AUTH::abort $auth_sid
        HTTP::release
    } elseif {$auth_status == 2} {
        set auth_prompt [string tolower [string range [AUTH::wantcredential_prompt $auth_sid] 0 7]]
        if {($auth_prompt == "username") and ($http_username != "")} {
            AUTH::authenticate_continue $auth_sid $http_username
        } elseif {($auth_prompt == "password") and ($http_password != "")} {
            AUTH::authenticate_continue $auth_sid $http_password
        } else {
            HTTP::respond 401
        }
    } else {
        HTTP::respond 401
    }
}