diff options
| -rw-r--r-- | main/guile/APKBUILD | 21 | ||||
| -rw-r--r-- | main/guile/CVE-2016-8605.patch | 86 | ||||
| -rw-r--r-- | main/guile/CVE-2016-8606.patch | 337 |
3 files changed, 440 insertions, 4 deletions
diff --git a/main/guile/APKBUILD b/main/guile/APKBUILD index d401afd60af..39d88df7d45 100644 --- a/main/guile/APKBUILD +++ b/main/guile/APKBUILD @@ -1,7 +1,7 @@ # Maintainer: Natanael Copa <ncopa@alpinelinux.org> pkgname=guile pkgver=2.0.11 -pkgrel=2 +pkgrel=3 pkgdesc="Guile is a portable, embeddable Scheme implementation written in C" url="http://www.gnu.org/software/guile/" arch="all" @@ -24,8 +24,15 @@ source="ftp://ftp.gnu.org/pub/gnu/$pkgname/$pkgname-$pkgver.tar.gz 0016-peval-Handle-optional-argument-inits-that-refer-to-p.patch strtol_l.patch + CVE-2016-8605.patch + CVE-2016-8606.patch " +# secfixes: +# 2.0.11-r3: +# - CVE-2016-8605 +# - CVE-2016-8606 + _builddir="$srcdir"/$pkgname-$pkgver prepare() { cd "$_builddir" @@ -68,7 +75,9 @@ f140776c944bacc6cc14919f83902696 0003-Recognize-more-ARM-targets.patch 9e7b0d2d52e22b253ac314c6cb317bb4 0013-Handle-p-in-format-warnings.patch 9bb62ca4bd913b5ba6a94868a2d33464 0015-Fix-SCM_SMOB_OBJECT-_-_0_-_1_-_2_-_3_-LOC.patch 04012be1e50736374564b14440e410f6 0016-peval-Handle-optional-argument-inits-that-refer-to-p.patch -54b76be46ecc9333e2a57cc0906c1927 strtol_l.patch" +54b76be46ecc9333e2a57cc0906c1927 strtol_l.patch +1c57e6341d07a224cdbc551ec8d6d204 CVE-2016-8605.patch +070801b5311195d67e60c00ab0c52d8b CVE-2016-8606.patch" sha256sums="e6786c934346fa2e38e46d8d81a622bb1c16d130153523f6129fcd79ef1fb040 guile-2.0.11.tar.gz 760355a63be9b756607a03352ceb916dfba02da917fa00c6bc07253d0f7c75f6 0002-Mark-mutex-with-owner-not-retained-threads-test-as-u.patch 1b438b5b513f6711c098a54944f907e4b4744bfd1b9315fb8bc33c67a1481952 0003-Recognize-more-ARM-targets.patch @@ -79,7 +88,9 @@ b7b3425c807d227dccf0ada653d3edd6d343d6c9d7ee648140bd13812f7776e7 0011-Fix-shrin 3557178fec43d58c62a505a3199054d4f32da97cfafaa969a8e9b90616bc603f 0013-Handle-p-in-format-warnings.patch 4ded8227e4b93a5205ddcf43f01e0e8c7684396669192b2e95b2c710573b6395 0015-Fix-SCM_SMOB_OBJECT-_-_0_-_1_-_2_-_3_-LOC.patch d28837b89c1653d9addf80573934dc97128a0c464b531f64fc58b1577f60340a 0016-peval-Handle-optional-argument-inits-that-refer-to-p.patch -2ba49adb27db50f5ec33779ce2f002cafde99a04038ca689bee7d2098296ce33 strtol_l.patch" +2ba49adb27db50f5ec33779ce2f002cafde99a04038ca689bee7d2098296ce33 strtol_l.patch +b3ec6eb44c1da56ae0ff3b942eff5c2b58ff7d194517e84ac80588344778ae2c CVE-2016-8605.patch +8fdde4ca1939916080fde3e484f5449669dfc0244eb75a9b7192b576bef72d84 CVE-2016-8606.patch" sha512sums="dc1a30d44e6d432fab2407d72385e959af863f6feba6cca5813b4de24c92200c78b44f336d1f4fa8c7b4058dea880982787c69888c91a2236fd2fb1d313137fd guile-2.0.11.tar.gz b1c309cc07830ff1741ef88857f8099187b449580e8d57862886abc367ef1accc5a35636d81eee09247f13d3a751cdc8909fdea05368d3d509bd2039ce06d078 0002-Mark-mutex-with-owner-not-retained-threads-test-as-u.patch 0d3a5fd9ebd34d65f9c5534ea87a161099f4e0d1aae0153226962776ad0b823becd1688fe431c8425968d44377aec5ba2f81865924652125f6356b5f9d993101 0003-Recognize-more-ARM-targets.patch @@ -90,4 +101,6 @@ b283ac11ca5d01a4ab102258ff896fb3fb6cb053144ea31ae0d43c0229c9b9509c4eadc90d757b23 8484e882723d68ea1e658a86c7be5006de1af7d457f7f9a37a99b427460db8420980174efdcaff8fbfa49346ba01252d2e6183c8b5e323bd228d223ed011655b 0013-Handle-p-in-format-warnings.patch 5f450e57968f2f0592a0de6beaa02db315d668a31a85330e3aa44d87995c82f866828fceb71012c123f5dd3b3b5c3ec944c8011ba09658ad00e8ce1c6f958a87 0015-Fix-SCM_SMOB_OBJECT-_-_0_-_1_-_2_-_3_-LOC.patch f55e514534fd1aba547ed8d4350fbeeaef77d634d7f1915a0108244a9bef5afe7074f3292b9f74bdccd0c56cddc60e222e9ccd2519ba337b6f156123e632ec26 0016-peval-Handle-optional-argument-inits-that-refer-to-p.patch -596efb03c65df98ea9afd932cb67e5b436e35fbf2442630e8a1854818f246b5a24eb920e3502ba28b882f0afb27c5148f1ff509c29baa91a7f37b3ecdc28c000 strtol_l.patch" +596efb03c65df98ea9afd932cb67e5b436e35fbf2442630e8a1854818f246b5a24eb920e3502ba28b882f0afb27c5148f1ff509c29baa91a7f37b3ecdc28c000 strtol_l.patch +3dea35a25321e50ba3b74bab45cb7d81335a82026c3f46b56079e79b00bcfeaa3cdfbe0d2834314d9a86a19eea5e8beaa9b8edef94b42cd2cdf2671203c0236b CVE-2016-8605.patch +aa9c7e546802255f349ba4567cd8f532fb3156edf65b1acc32b3b330db19a407390509fae63c944b946c7d86b99728561a446d64d758a5667bd4b7b5055bfbc4 CVE-2016-8606.patch" diff --git a/main/guile/CVE-2016-8605.patch b/main/guile/CVE-2016-8605.patch new file mode 100644 index 00000000000..aee593fbd53 --- /dev/null +++ b/main/guile/CVE-2016-8605.patch @@ -0,0 +1,86 @@ +From 245608911698adb3472803856019bdd5670b6614 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org> +Date: Tue, 11 Oct 2016 10:14:26 +0200 +Subject: Remove 'umask' calls from 'mkdir'. + +Fixes <http://bugs.gnu.org/24659>. + +* libguile/filesys.c (SCM_DEFINE): Remove calls to 'umask' when MODE is +unbound; instead, use 0777 as the mode. Update docstring to clarify +this. +* doc/ref/posix.texi (File System): Adjust accordingly. +* NEWS: Mention it. +--- + NEWS | 14 +++++++++++++- + doc/ref/posix.texi | 7 ++++--- + libguile/filesys.c | 25 ++++++++++--------------- + 3 files changed, 27 insertions(+), 19 deletions(-) + +diff --git a/doc/ref/posix.texi b/doc/ref/posix.texi +index 2b9011d..a818604 100644 +--- a/doc/ref/posix.texi ++++ b/doc/ref/posix.texi +@@ -864,9 +864,10 @@ Create a symbolic link named @var{newpath} with the value (i.e., pointing to) + @deffn {Scheme Procedure} mkdir path [mode] + @deffnx {C Function} scm_mkdir (path, mode) + Create a new directory named by @var{path}. If @var{mode} is omitted +-then the permissions of the directory file are set using the current +-umask (@pxref{Processes}). Otherwise they are set to the decimal +-value specified with @var{mode}. The return value is unspecified. ++then the permissions of the directory are set to @code{#o777} ++masked with the current umask (@pxref{Processes, @code{umask}}). ++Otherwise they are set to the value specified with @var{mode}. ++The return value is unspecified. + @end deffn + + @deffn {Scheme Procedure} rmdir path +diff --git a/libguile/filesys.c b/libguile/filesys.c +index e6e1db5..e6e37b0 100644 +--- a/libguile/filesys.c ++++ b/libguile/filesys.c +@@ -1,5 +1,5 @@ + /* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2006, +- * 2009, 2010, 2011, 2012, 2013, 2014 Free Software Foundation, Inc. ++ * 2009, 2010, 2011, 2012, 2013, 2014, 2016 Free Software Foundation, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License +@@ -1255,26 +1255,21 @@ SCM_DEFINE (scm_getcwd, "getcwd", 0, 0, 0, + SCM_DEFINE (scm_mkdir, "mkdir", 1, 1, 0, + (SCM path, SCM mode), + "Create a new directory named by @var{path}. If @var{mode} is omitted\n" +- "then the permissions of the directory file are set using the current\n" +- "umask. Otherwise they are set to the decimal value specified with\n" +- "@var{mode}. The return value is unspecified.") ++ "then the permissions of the directory are set to @code{#o777}\n" ++ "masked with the current umask (@pxref{Processes, @code{umask}}).\n" ++ "Otherwise they are set to the value specified with @var{mode}.\n" ++ "The return value is unspecified.") + #define FUNC_NAME s_scm_mkdir + { + int rv; +- mode_t mask; ++ mode_t c_mode; + +- if (SCM_UNBNDP (mode)) +- { +- mask = umask (0); +- umask (mask); +- STRING_SYSCALL (path, c_path, rv = mkdir (c_path, 0777 ^ mask)); +- } +- else +- { +- STRING_SYSCALL (path, c_path, rv = mkdir (c_path, scm_to_uint (mode))); +- } ++ c_mode = SCM_UNBNDP (mode) ? 0777 : scm_to_uint (mode); ++ ++ STRING_SYSCALL (path, c_path, rv = mkdir (c_path, c_mode)); + if (rv != 0) + SCM_SYSERROR; ++ + return SCM_UNSPECIFIED; + } + #undef FUNC_NAME +-- +cgit v1.0 + diff --git a/main/guile/CVE-2016-8606.patch b/main/guile/CVE-2016-8606.patch new file mode 100644 index 00000000000..2ba897db0b7 --- /dev/null +++ b/main/guile/CVE-2016-8606.patch @@ -0,0 +1,337 @@ +From 08c021916dbd3a235a9f9cc33df4c418c0724e03 Mon Sep 17 00:00:00 2001 +From: Mark H Weaver <mhw@netris.org> +Date: Fri, 9 Sep 2016 07:36:52 -0400 +Subject: REPL Server: Guard against HTTP inter-protocol exploitation attacks. +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Reported by Christopher Allan Webber <cwebber@dustycloud.org> +Co-authored-by: Ludovic Courtès <ludo@gnu.org> + +This commit adds protection to Guile's REPL servers against HTTP +inter-protocol exploitation attacks, a scenario whereby an attacker can, +via an HTML page, cause a web browser to send data to TCP servers +listening on a loopback interface or private network. See +<https://en.wikipedia.org/wiki/Inter-protocol_exploitation> and +<https://www.jochentopf.com/hfpa/hfpa.pdf>, The HTML Form Protocol +Attack (2001) by Tochen Topf <jochen@remote.org>. + +Here we add a procedure to 'before-read-hook' that looks for a possible +HTTP request-line in the first line of input from the client socket. If +present, the socket is drained and closed, and a loud warning is written +to stderr (POSIX file descriptor 2). + +* module/system/repl/server.scm: Add 'maybe-check-for-http-request' +to 'before-read-hook' when this module is loaded. +(with-temporary-port-encoding, with-saved-port-line+column) +(drain-input-and-close, permissive-http-request-line?) +(check-for-http-request, guard-against-http-request) +(maybe-check-for-http-request): New procedures. +(serve-client): Use 'guard-against-http-request'. +* module/system/repl/coop-server.scm (start-repl-client): Use +'guard-against-http-request'. +* doc/ref/guile-invoke.texi (Command-line Options): In the description +of the --listen option, make the security warning more prominent. +Mention the new protection added here. Recommend using UNIX domain +sockets for REPL servers. "a path to" => "the file name of". +--- + doc/ref/guile-invoke.texi | 20 +++- + module/system/repl/coop-server.scm | 7 +- + module/system/repl/server.scm | 182 ++++++++++++++++++++++++++++++++++++- + 3 files changed, 201 insertions(+), 8 deletions(-) + +diff --git a/doc/ref/guile-invoke.texi b/doc/ref/guile-invoke.texi +index 4cf833f..5be8f20 100644 +--- a/doc/ref/guile-invoke.texi ++++ b/doc/ref/guile-invoke.texi +@@ -1,7 +1,7 @@ + @c -*-texinfo-*- + @c This is part of the GNU Guile Reference Manual. +-@c Copyright (C) 1996, 1997, 2000, 2001, 2002, 2003, 2004, 2005, 2010, 2011, 2013 +-@c Free Software Foundation, Inc. ++@c Copyright (C) 1996, 1997, 2000-2005, 2010, 2011, 2013, 2014, ++@c 2016 Free Software Foundation, Inc. + @c See the file guile.texi for copying conditions. + + @node Invoking Guile +@@ -176,7 +176,7 @@ the @file{.guile} file. @xref{Init File}. + While this program runs, listen on a local port or a path for REPL + clients. If @var{p} starts with a number, it is assumed to be a local + port on which to listen. If it starts with a forward slash, it is +-assumed to be a path to a UNIX domain socket on which to listen. ++assumed to be the file name of a UNIX domain socket on which to listen. + + If @var{p} is not given, the default is local port 37146. If you look + at it upside down, it almost spells ``Guile''. If you have netcat +@@ -184,12 +184,22 @@ installed, you should be able to @kbd{nc localhost 37146} and get a + Guile prompt. Alternately you can fire up Emacs and connect to the + process; see @ref{Using Guile in Emacs} for more details. + +-Note that opening a port allows anyone who can connect to that port---in +-the TCP case, any local user---to do anything Guile can do, as the user ++@quotation Note ++Opening a port allows anyone who can connect to that port to do anything ++Guile can do, as the user + that the Guile process is running as. Do not use @option{--listen} on + multi-user machines. Of course, if you do not pass @option{--listen} to + Guile, no port will be opened. + ++Guile protects against the ++@uref{https://en.wikipedia.org/wiki/Inter-protocol_exploitation, ++@dfn{HTTP inter-protocol exploitation attack}}, a scenario whereby an ++attacker can, @i{via} an HTML page, cause a web browser to send data to ++TCP servers listening on a loopback interface or private network. ++Nevertheless, you are advised to use UNIX domain sockets, as in ++@code{--listen=/some/local/file}, whenever possible. ++@end quotation ++ + That said, @option{--listen} is great for interactive debugging and + development. + +diff --git a/module/system/repl/coop-server.scm b/module/system/repl/coop-server.scm +index c19dda1..ae31ce8 100644 +--- a/module/system/repl/coop-server.scm ++++ b/module/system/repl/coop-server.scm +@@ -1,6 +1,6 @@ + ;;; Cooperative REPL server + +-;; Copyright (C) 2014 Free Software Foundation, Inc. ++;; Copyright (C) 2014, 2016 Free Software Foundation, Inc. + + ;; This library is free software; you can redistribute it and/or + ;; modify it under the terms of the GNU Lesser General Public +@@ -29,7 +29,8 @@ + #:select (start-repl* prompting-meta-read)) + #:use-module ((system repl server) + #:select (run-server* make-tcp-server-socket +- add-open-socket! close-socket!)) ++ add-open-socket! close-socket! ++ guard-against-http-request)) + #:export (spawn-coop-repl-server + poll-coop-repl-server)) + +@@ -173,6 +174,8 @@ and output is sent over the socket CLIENT." + ;; another thread. + (add-open-socket! client (lambda () (close-fdes (fileno client)))) + ++ (guard-against-http-request client) ++ + (with-continuation-barrier + (lambda () + (coop-repl-prompt +diff --git a/module/system/repl/server.scm b/module/system/repl/server.scm +index ff9ee5c..9ece947 100644 +--- a/module/system/repl/server.scm ++++ b/module/system/repl/server.scm +@@ -1,6 +1,6 @@ + ;;; Repl server + +-;; Copyright (C) 2003, 2010, 2011, 2014 Free Software Foundation, Inc. ++;; Copyright (C) 2003, 2010, 2011, 2014, 2016 Free Software Foundation, Inc. + + ;; This library is free software; you can redistribute it and/or + ;; modify it under the terms of the GNU Lesser General Public +@@ -22,8 +22,13 @@ + (define-module (system repl server) + #:use-module (system repl repl) + #:use-module (ice-9 threads) ++ #:use-module (ice-9 rdelim) + #:use-module (ice-9 match) ++ #:use-module (ice-9 iconv) ++ #:use-module (rnrs bytevectors) ++ #:use-module (rnrs io ports) + #:use-module (srfi srfi-1) ++ #:use-module (srfi srfi-26) ; cut + #:export (make-tcp-server-socket + make-unix-domain-server-socket + run-server +@@ -154,6 +159,8 @@ + ;; Arrange to cancel this thread to forcefully shut down the socket. + (add-open-socket! client (lambda () (cancel-thread thread)))) + ++ (guard-against-http-request client) ++ + (with-continuation-barrier + (lambda () + (parameterize ((current-input-port client) +@@ -162,3 +169,176 @@ + (current-warning-port client)) + (with-fluids ((*repl-stack* '())) + (start-repl)))))) ++ ++ ++;;; ++;;; The following code adds protection to Guile's REPL servers against ++;;; HTTP inter-protocol exploitation attacks, a scenario whereby an ++;;; attacker can, via an HTML page, cause a web browser to send data to ++;;; TCP servers listening on a loopback interface or private network. ++;;; See <https://en.wikipedia.org/wiki/Inter-protocol_exploitation> and ++;;; <https://www.jochentopf.com/hfpa/hfpa.pdf>, The HTML Form Protocol ++;;; Attack (2001) by Tochen Topf <jochen@remote.org>. ++;;; ++;;; Here we add a procedure to 'before-read-hook' that looks for a possible ++;;; HTTP request-line in the first line of input from the client socket. If ++;;; present, the socket is drained and closed, and a loud warning is written ++;;; to stderr (POSIX file descriptor 2). ++;;; ++ ++(define (with-temporary-port-encoding port encoding thunk) ++ "Call THUNK in a dynamic environment in which the encoding of PORT is ++temporarily set to ENCODING." ++ (let ((saved-encoding #f)) ++ (dynamic-wind ++ (lambda () ++ (unless (port-closed? port) ++ (set! saved-encoding (port-encoding port)) ++ (set-port-encoding! port encoding))) ++ thunk ++ (lambda () ++ (unless (port-closed? port) ++ (set! encoding (port-encoding port)) ++ (set-port-encoding! port saved-encoding)))))) ++ ++(define (with-saved-port-line+column port thunk) ++ "Save the line and column of PORT before entering THUNK, and restore ++their previous values upon normal or non-local exit from THUNK." ++ (let ((saved-line #f) (saved-column #f)) ++ (dynamic-wind ++ (lambda () ++ (unless (port-closed? port) ++ (set! saved-line (port-line port)) ++ (set! saved-column (port-column port)))) ++ thunk ++ (lambda () ++ (unless (port-closed? port) ++ (set-port-line! port saved-line) ++ (set-port-column! port saved-column)))))) ++ ++(define (drain-input-and-close socket) ++ "Drain input from SOCKET using ISO-8859-1 encoding until it would block, ++and then close it. Return the drained input as a string." ++ (dynamic-wind ++ (lambda () ++ ;; Enable full buffering mode on the socket to allow ++ ;; 'get-bytevector-some' to return non-trivial chunks. ++ (setvbuf socket _IOFBF)) ++ (lambda () ++ (let loop ((chunks '())) ++ (let ((result (and (char-ready? socket) ++ (get-bytevector-some socket)))) ++ (if (bytevector? result) ++ (loop (cons (bytevector->string result "ISO-8859-1") ++ chunks)) ++ (string-concatenate-reverse chunks))))) ++ (lambda () ++ ;; Close the socket even in case of an exception. ++ (close-port socket)))) ++ ++(define permissive-http-request-line? ++ ;; This predicate is deliberately permissive ++ ;; when checking the Request-URI component. ++ (let ((cs (ucs-range->char-set #x20 #x7E)) ++ (rx (make-regexp ++ (string-append ++ "^(OPTIONS|GET|HEAD|POST|PUT|DELETE|TRACE|CONNECT) " ++ "[^ ]+ " ++ "HTTP/[0-9]+.[0-9]+$")))) ++ (lambda (line) ++ "Return true if LINE might plausibly be an HTTP request-line, ++otherwise return #f." ++ ;; We cannot simplify this to a simple 'regexp-exec', because ++ ;; 'regexp-exec' cannot cope with NUL bytes. ++ (and (string-every cs line) ++ (regexp-exec rx line))))) ++ ++(define (check-for-http-request socket) ++ "Check for a possible HTTP request in the initial input from SOCKET. ++If one is found, close the socket and print a report to STDERR (fdes 2). ++Otherwise, put back the bytes." ++ ;; Temporarily set the port encoding to ISO-8859-1 to allow lossless ++ ;; reading and unreading of the first line, regardless of what bytes ++ ;; are present. Note that a valid HTTP request-line contains only ++ ;; ASCII characters. ++ (with-temporary-port-encoding socket "ISO-8859-1" ++ (lambda () ++ ;; Save the port 'line' and 'column' counters and later restore ++ ;; them, since unreading what we read is not sufficient to do so. ++ (with-saved-port-line+column socket ++ (lambda () ++ ;; Read up to (but not including) the first CR or LF. ++ ;; Although HTTP mandates CRLF line endings, we are permissive ++ ;; here to guard against the possibility that in some ++ ;; environments CRLF might be converted to LF before it ++ ;; reaches us. ++ (match (read-delimited "\r\n" socket 'peek) ++ ((? eof-object?) ++ ;; We found EOF before any input. Nothing to do. ++ 'done) ++ ++ ((? permissive-http-request-line? request-line) ++ ;; The input from the socket began with a plausible HTTP ++ ;; request-line, which is unlikely to be legitimate and may ++ ;; indicate an possible break-in attempt. ++ ++ ;; First, set the current port parameters to a void-port, ++ ;; to avoid sending any more data over the socket, to cause ++ ;; the REPL reader to see EOF, and to swallow any remaining ++ ;; output gracefully. ++ (let ((void-port (%make-void-port "rw"))) ++ (current-input-port void-port) ++ (current-output-port void-port) ++ (current-error-port void-port) ++ (current-warning-port void-port)) ++ ++ ;; Read from the socket until we would block, ++ ;; and then close it. ++ (let ((drained-input (drain-input-and-close socket))) ++ ++ ;; Print a report to STDERR (POSIX file descriptor 2). ++ ;; XXX Can we do better here? ++ (call-with-port (dup->port 2 "w") ++ (cut format <> " ++@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ ++@@ POSSIBLE BREAK-IN ATTEMPT ON THE REPL SERVER @@ ++@@ BY AN HTTP INTER-PROTOCOL EXPLOITATION ATTACK. See: @@ ++@@ <https://en.wikipedia.org/wiki/Inter-protocol_exploitation> @@ ++@@ Possible HTTP request received: ~S ++@@ The associated socket has been closed. @@ ++@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n" ++ (string-append request-line ++ drained-input))))) ++ ++ (start-line ++ ;; The HTTP request-line was not found, so ++ ;; 'unread' the characters that we have read. ++ (unread-string start-line socket)))))))) ++ ++(define (guard-against-http-request socket) ++ "Arrange for the Guile REPL to check for an HTTP request in the ++initial input from SOCKET, in which case the socket will be closed. ++This guards against HTTP inter-protocol exploitation attacks, a scenario ++whereby an attacker can, via an HTML page, cause a web browser to send ++data to TCP servers listening on a loopback interface or private ++network." ++ (%set-port-property! socket 'guard-against-http-request? #t)) ++ ++(define* (maybe-check-for-http-request ++ #:optional (socket (current-input-port))) ++ "Apply check-for-http-request to SOCKET if previously requested by ++guard-against-http-request. This procedure is intended to be added to ++before-read-hook." ++ (when (%port-property socket 'guard-against-http-request?) ++ (check-for-http-request socket) ++ (unless (port-closed? socket) ++ (%set-port-property! socket 'guard-against-http-request? #f)))) ++ ++;; Install the hook. ++(add-hook! before-read-hook ++ maybe-check-for-http-request) ++ ++;;; Local Variables: ++;;; eval: (put 'with-temporary-port-encoding 'scheme-indent-function 2) ++;;; eval: (put 'with-saved-port-line+column 'scheme-indent-function 1) ++;;; End: +-- +cgit v1.0 + |