Handling Input in Java

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5 Handling Input
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incorporates both the operation and the security checks trivial In other cases, the placement of security checks can be dif cult because the ideal location for a given security check might not be evident The pairing of security checks and functions could be a tight one-to-one coupling, in which case a function can simply be replaced with an alternative, or it might be most effective to implement a one-to-many pairing in which one base function is wrapped multiple times to more precisely couple appropriate security checks with common use cases Input functions aren t all you should include Validation points where dangerous operations are performed should take context into account to perform checks on the content of the data that ensure that the operation to be performed will be secure For example, in the case of buffer overflow, these checks should include validation that ensures that strings are properly terminated and are free from format string metacharacters (where appropriate) Depending on your buffer allocation strategy, checks performed at this level also need to limit the size of the data operated on and potentially tie into code to resize existing buffers Validation wrappers should make it immediately obvious (to both a human and a tool) that the potentially dangerous operation is guaranteed to be safe without any dependency on code outside the immediate context Here, in particular, it is critical that safety checks be written concisely and coherently so that they can be easily verified Example 520 gives an implementation for the function strlcpy() It is both an implementation of a common C string operation (copying a string) and a replacement for two more problematic functions: strcpy() (which performs no buffer size checks) and strncpy() (which does not guarantee that the destination buffer will be null-terminated) The strlcpy()function first appeared in OpenBSD and is making its way into other platforms Refer to 6, Buffer Overflow, for a discussion of other functions designed to prevent buffer overflow vulnerabilities
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Example 520 Code that implements the same functionality as strncpy() but adds the property that the destination string will always be null-terminated This wrapper function is available off the shelf on OpenBSD and some other platforms under the name strlcpy()
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size_t strlcpy(char *dst, const char *src, size_t siz) { char *d = dst; const char *s = src; size_t n = siz; /* Copy as many bytes as will fit */ if (n != 0 && --n != 0) { do { if ((*d++ = *s++) == '\0') break; } while (--n != 0); } /* Not enough room in dst, add NULL and traverse rest of src */ if (n == 0) { if (siz != 0) *d = '\0'; /* NULL-terminate dst */ while (*s++); } return(s - src - 1); } /* count does not include NUL */
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Security-enhanced APIs can also make a trust boundary easier to maintain by making it obvious that validation is supposed to occur as data cross the boundary Consider the trust boundary discussed earlier in the chapter The contents of the HttpSession object are usually considered trusted because they cannot be set or altered except by the application itself Because the HttpSession often carries information that enters the program via an untrusted HTTP request, the HttpSessionsetAttribute() method (the method that allows data to be stored in an HttpSession) forms a natural trust boundary in a Java Web application Example 521 lists a pair of methods that can serve as a proxy for direct calls to HttpSessionsetAttribute() The new setAttribute() method requires the new value to match a regular expression before it sets the value in the session This method also adds the requirement that the attribute, the value, and the pattern all be non-null To remove an attribute, there is a separate unsetAttribute() method
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