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net/win32-ssl: repairs for CS

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This commit is contained in:
Matthew Flatt 2018-11-10 14:16:48 -08:00
parent 350ecf3d49
commit d0fab4027b
1 changed files with 33 additions and 19 deletions
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50
racket/collects/net/win32-ssl.rkt
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@ -247,7 +247,9 @@
;; Helpers to manage the clunky SecBuffer API
(define (make-SecBuffers n)
(cast (malloc n _SecBuffer 'atomic-interior) _pointer _SecBuffer-pointer))
(define p (malloc n _SecBuffer 'atomic-interior))
(cpointer-push-tag! p SecBuffer-tag)
p)
(define (make-SecBuffers! sbs . vals)
(define n
@ -376,7 +378,8 @@
(log-win32-ssl-debug "init context: done")
(values ctx
(let ([n (get-leftover-bytes)])
(pointer->bytes buffer n)))]
(pointer->bytes buffer n))
buffer)]
[(or (= r SEC_I_CONTINUE_NEEDED)
(= r SEC_E_INCOMPLETE_MESSAGE))
;; Pull more data from the server
@ -406,19 +409,22 @@
[else (network-error 'create-context
"unexpected result: ~x" r)])))))
(define (decrypt ctx in-pre-r in-post-w out-sb)
(define (decrypt ctx in-pre-r in-post-w out-sb msg-size)
;; Read encrypted byte from `in-pre-r', write decrypted bytes to
;; `in-port-w'.
;; Loop to try to get a big enough chunk from the input to be able
;; to decrypt it.
(let loop ([size 4096] [prev-n 0])
(define buffer (make-bytes size))
(define n (peek-bytes-avail!* buffer 0 #f in-pre-r))
(define n (peek-bytes! buffer 0 in-pre-r 0 (min (bytes-length buffer)
(pipe-content-length in-pre-r))))
(define immobile-buffer (malloc (add1 n) 'atomic-interior))
(memcpy immobile-buffer buffer n)
(define r (DecryptMessage (ctx->handle ctx)
(make-SecBuffers! out-sb
n
SECBUFFER_DATA
buffer
immobile-buffer
0
SECBUFFER_EMPTY
#f
@ -446,7 +452,7 @@
(write-bytes (pointer->bytes (SecBuffer-pvBuffer sb)
(SecBuffer-cbBuffer sb))
in-post-w)
(define remain (or (for/or ([i (in-range 1 4)])
(define remain (or (for/or ([i (in-range 0 4)])
(define sb (ptr-ref out-sb _SecBuffer i))
(and (= SECBUFFER_EXTRA (SecBuffer-BufferType sb))
(SecBuffer-cbBuffer sb)))
@ -456,6 +462,7 @@
(SecBuffer-cbBuffer sb)
remain)
(read-bytes! buffer in-pre-r 0 (- n remain))
(void/reference-sink immobile-buffer)
(unless (zero? remain)
(loop size 0))]
[(= r SEC_E_INCOMPLETE_MESSAGE)
@ -470,16 +477,16 @@
[else
(network-error 'decrypt "unexpected result: ~x" r)])))
(define (encrypt ctx bstr start end out-sb sizes buffer)
(define (encrypt ctx bstr start end out-sb sizes buffer buffer-len)
;; Encrypt bytes [start, end) from bstr.
;; If we have too much to encrypt at once, we'll encrypt
;; halves separately:
(define (divide-and-conquer)
(define mid (quotient (+ start end) 2))
(bytes-append (encrypt ctx bstr start mid out-sb sizes buffer)
(encrypt ctx bstr mid end out-sb sizes buffer)))
(bytes-append (encrypt ctx bstr start mid out-sb sizes buffer buffer-len)
(encrypt ctx bstr mid end out-sb sizes buffer buffer-len)))
(cond
[((- end start) . > . (bytes-length buffer))
[((- end start) . > . buffer-len)
;; Too much right from the start:
(divide-and-conquer)]
[else
@ -513,7 +520,9 @@
(define len (+ (SecBuffer-cbBuffer (ptr-ref out-sb _SecBuffer 0))
(SecBuffer-cbBuffer (ptr-ref out-sb _SecBuffer 1))
(SecBuffer-cbBuffer (ptr-ref out-sb _SecBuffer 2))))
(subbytes buffer 0 len)]
(define result (make-bytes len))
(memcpy result buffer len)
result]
[(= r SEC_E_BUFFER_TOO_SMALL)
;; The encrypted bytes don't fit in the unencrypted space?
(divide-and-conquer)]
@ -529,7 +538,7 @@
(define in-sb (make-SecBuffers 2))
;; Allocate the encoding/decoding context:
(define-values (ctx init-bytes) (create-context protocol hostname i o out-sb in-sb))
(define-values (ctx init-bytes tok-buffer) (create-context protocol hostname i o out-sb in-sb))
;; Get some sizes that we need for encoding:
(define sizes (make-SecPkgContext_StreamSizes 0 0 0 0 0))
@ -539,16 +548,19 @@
(define msize (SecPkgContext_StreamSizes-cbMaximumMessage sizes))
(define hsize (SecPkgContext_StreamSizes-cbHeader sizes))
(define tsize (SecPkgContext_StreamSizes-cbTrailer sizes))
(define msg-size (+ msize hsize tsize))
;; Some pipes to manage the decoding stream:
(define-values (in-pre-r in-pre-w) (make-pipe))
(define-values (in-post-r in-post-w) (make-pipe))
(write-bytes init-bytes in-pre-w)
(decrypt ctx in-pre-r in-post-w out-sb)
(decrypt ctx in-pre-r in-post-w out-sb msg-size)
;; More working space:
(define buffer (make-bytes (max 8000 (+ msize hsize tsize))))
(define out-buffer-len (bytes-length buffer))
(define out-buffer (malloc (add1 out-buffer-len) 'atomic-interior))
;; Port lock and state:
(define lock (make-semaphore 1))
@ -563,7 +575,10 @@
(close-output-port o)
(let ([v ctx])
(set! ctx #f)
(when v (free-ctx v)))))
(when v (free-ctx v)))
(void/reference-sink tok-buffer)
(void/reference-sink in-sb)
(void/reference-sink out-sb)))
;; Callbacks used below (written here so that they're allocated once):
(define (lock-unavailable/read) (wrap-evt lock (lambda () 0)))
@ -585,13 +600,12 @@
n]
[(zero? n)
;; Nothing decrypted, no new input, so wait for input:
(log-win32-ssl-debug "blocked")
(wrap-evt i (lambda (v) 0))]
[else
(log-win32-ssl-debug "underlying receive: ~a" n)
;; Get some fresh bytes, so try decoding now:
;; Got some fresh bytes, so try decoding now:
(write-bytes buffer in-pre-w 0 n)
(decrypt ctx in-pre-r in-post-w out-sb)
(decrypt ctx in-pre-r in-post-w out-sb msg-size)
(loop)])]
[else n])))
@ -627,7 +641,7 @@
0]
[(not leftover-bytes)
;; Nothing in the output buffer, so we can encrypt more
(define encrypted-bstr (encrypt ctx bstr start end out-sb sizes buffer))
(define encrypted-bstr (encrypt ctx bstr start end out-sb sizes out-buffer out-buffer-len))
(define n (write-bytes-avail* encrypted-bstr o))
(cond
[(zero? n)