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The easiest way to hide definitions is to make them local to expressions or constructed class definitions using inner let bindings. These aren t directly accessible from outside their scope. This technique is frequently used to hide state and other computed values inside the implementations of functions and objects. Let s begin with a simple example. Here is the definition of a function that incorporates a single item of encapsulated state: let generateTicket = let count = ref 0 (fun () -> incr count; !count) If you examine this definition, you see that the generateTicket function isn t defined immediately as a function but instead first declares a local element of state called count and then returns a function value that refers to this state. Each time the function value is called, count is incremented and dereferenced, but the reference cell is never published outside the function implementation and is thus encapsulated. Encapsulation through local definitions is a particularly powerful technique in F# when used in conjunction with object expressions. For example, Listing 7-1 shows the definition of an object interface type called IPeekPoke and a function that implements objects of this type using an object expression. Listing 7-1. Implementing Objects with Encapsulated State type IPeekPoke = abstract member Peek: unit -> int abstract member Poke: int -> unit let makeCounter initialState = let state = ref initialState { new IPeekPoke with member x.Poke(n) = state := !state + n member x.Peek() = !state } The type of the function Counter is as follows: val makeCounter : int -> IPeekPoke

This, obviously, is a bad thing. However, we now have power to fight against this attack, using the profile defined below. In this profile, we deny write access to our rsync wrapper, preventing the above exploit from being accomplished. In the following profile, we define a sandbox profile that allows for secure remote backups with CCC. In this profile, we specify a backup directory on the remote server at /Backups, you will likely want to change this to satisfy your environment.

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As with the earlier generateTicket function, the internal state for each object generated by the makeCounter function is hidden and accessible only via the published Peek and Poke methods The previous examples show how to combine let bindings with anonymous functions and object expressions You saw in 6 how let bindings can also be used in constructed class types For example, Listing 7-2 shows a constructed class type with private mutable state count and that publishes two methods: Next and Reset Listing 7-2 A Type for Objects with Encapsulated State type TicketGenerator() = // Note: let bindings in a type definition are implicitly private to the object // being constructed Members are implicitly public let mutable count = 0 member xNext() = count <- count + 1; count member x.

(version 1) (debug deny) (allow default signal mach*) (deny network-outbound) ;; change PathToBackupDir to the local target directory. (allow file-write* file-read-data file-read-metadata (subpath "/Backups")) ;;; Static Entries, shouldn't have to mess with the below (allow process-exec file-read-data file-read-metadata (regex "^(/private) /var/root/\.ssh/rsync-wrapper\.sh$") (regex "^(/private) /var/root/rsync$") (literal "/usr/bin/scp") (literal "/usr/bin/which") (regex "^/bin") (literal "/usr/libexec/sshd-keygen-wrapper")) (allow process-fork) (deny process*) ;; our global denies (deny file-read-data file-read-metadata (regex "^/.*")) (deny file-write* (regex "^/.*")) ;; our fine-grained allows. (allow file-read-data file-read-metadata (regex "^(/private) /var/root") (literal "/dev/autofs_nowait") (literal "/usr/lib/charset.alias")) ;; CCC seems to want to overwrite its copy of rsync ;; in root user's home on the server each time it runs, ;; the backup fails if the scp fails, so we add a rule. (allow file-write* file-read-data file-read-metadata (regex "^(/private) /var/root/rsync$") (literal "/Library/Logs/CCC.log") (regex "^(/private) /tmp")) ;; import the bsd profile (import "bsd.sb")

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