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Null-Terminate Source and Destination Ensure that both the source and destination buffers passed to strncat() are null-terminated This guideline addresses a misuse of strncat() caused by its unusual interface Most string-manipulation functions do not impose

The send_data method allows you to send textual or binary data in a buffer to the user as a named file You can set options that affect the content type and apparent filename, and alter whether an attempt is made to display the data inline with other content in the browser or the user is prompted to download it as an attachment

Options The send_data method has the following options:

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any precondition requirements on the destination buffer But in the case of strncat(), the programmer must ensure that the destination buffer passed to the function is properly terminated If its destination buffer is not properly terminated, strncat() will search beyond the end of the buffer until it nds a null byte and proceed to copy data from the source to this arbitrary location in memory Errors of this kind can be dif cult to identify with short tests because, during a short test, memory is more likely to be zeroed out The code in Example 625 has been rewritten to correctly bound the calls to strncat(), but upon further inspection, the code contains another potential vulnerability Depending on the length of user, the call to strncpy() might truncate the data copied into record and cause it to be unterminated when used as the destination buffer passed to the subsequent calls to strncat() Next, we cover truncation errors such as this one

:filename Suggests a filename for the browser to use :type Specifies an HTTP content type Defaults to 'application/octet-stream' :disposition Specifies whether the file will be shown inline or downloaded Valid

values are inline and attachment (default)

Web components are like any other SCA component in that they may have references wired to remotable services

status Specifies the status code to send with the response Defaults to '200 OK'

Example 625 Code from Example 624 with correct bounds speci ed to strncat(), but truncation problems remain

Usage Examples Creating a download of a dynamically generated tarball:

send_data generate_tgz('dir'), :filename => 'dirtgz'

strncpy(record, user, MAX_STRING_LEN - 1); strncat(record, ":", MAX_STRING_LEN strlen(record) - 1); strncat(record, cpw, MAX_STRING_LEN - strlen(record) - 1);

Sending a dynamic image to the browser, like for instance a captcha system:

require 'RMagick' class CaptchaController < ApplicationController def image # create an RMagic canvas and render difficult to read text on it img = canvasflatten_images imgformat = "JPG" # send it to the browser send_data imgto_blob, :disposition => 'inline', :type => 'image/jpg' end end

Web components are like any other SCA component in that they may have references wired to remotable services Returning to the BigBank loan application from previous chapters, BigBank may decide to offer a consumer-facing web application that offers loans directly to customers In this case, a Java EE web application will provide the user interface and interact with the LoanService for processing Listing 121 illustrates this scenario

Truncation Errors Even when used correctly, bounded string functions can introduce errors because they truncate any data that exceed the speci ed bound Operations susceptible to truncation errors can either modify the original data or, more commonly, truncate the data in the process of copying the data from one location to another The effects of truncation errors are hard to predict Truncated data might have an unexpected meaning or become syntactically or semantically malformed so that subsequent operations on the data produce errors or incorrect behavior For example, if an access control check is performed on a lename and the lename is subsequently truncated, the program might assume that it still refers to a resource the user is authorized to access An attacker can then use this situation to access an otherwise unavailable resource

493 send file(path, options = {})

The send_file method sends an existing file down to the client using Rack::Sendfile middleware, which intercepts the response and replaces it with a webserver specific X-Sendfile header The web server then becomes responsible for writing the file contents to the client instead of Rails This can dramatically reduce the amount of work accomplished in Ruby and takes advantage of the web servers optimized file delivery code6

Options Here are the options available for send_file:

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