Address "CVE-2023-38545" in bundled curl library (v7.69).

The patch is applied during the CMake preparation step, before compiling the bundled  curl source code.
Closes davix#107

cmake/modules/buildCurl.cmake

@@ -10,7 +10,7 @@ macro(buildCurl)
       SOURCE_DIR "${CMAKE_SOURCE_DIR}/deps/curl"
       BINARY_DIR "${CMAKE_BINARY_DIR}/deps/curl"
       PREFIX "${CMAKE_BINARY_DIR}/deps/curl"
-      PATCH_COMMAND bash -c "(test -f .git && git checkout -q lib/setopt.c || true) && set -x && git apply ${CMAKE_SOURCE_DIR}/curl-CVE-2022-32221.patch"
+      PATCH_COMMAND bash -c "(test -f .git && git checkout -q lib/setopt.c lib/socks.c tests/data/Makefile.inc || true) && set -x && git apply ${CMAKE_SOURCE_DIR}/curl-CVE-2022-32221.patch ${CMAKE_SOURCE_DIR}/curl-CVE-2023-38545_7.69.0.patch"
       CONFIGURE_COMMAND bash -c "${CMAKE_COMMAND} -DCMAKE_INSTALL_PREFIX=/usr/ -DCMAKE_INSTALL_LIBDIR=lib -DHTTP_ONLY=ON -DBUILD_CURL_EXE=OFF -DBUILD_TESTING=OFF -DBUILD_SHARED_LIBS=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DCMAKE_USE_LIBSSH2=OFF ${SECURE_TRANSPORT_FLAGS} ${CMAKE_SOURCE_DIR}/deps/curl && ${CMAKE_SOURCE_DIR}/patch-curl-clock-gettime.sh"
       BUILD_COMMAND make
       INSTALL_COMMAND make DESTDIR=${CMAKE_BINARY_DIR}/deps/curl-install install

curl-CVE-2023-38545_7.69.0.patch

@@ -0,0 +1,140 @@
+From c736c1e678d1b81d895281e419e59d9c4e853071 Mon Sep 17 00:00:00 2001
+From: Jay Satiro <raysatiro@yahoo.com>
+Date: Mon, 9 Oct 2023 15:37:31 -0400
+Subject: [PATCH] socks: return error if hostname too long for remote resolve
+
+Prior to this change the state machine attempted to change the remote
+resolve to a local resolve if the hostname was longer than 255
+characters. Unfortunately that did not work as intended and caused a
+security issue.
+
+This patch applies to curl versions 7.69.0 - 7.72.0. Other versions
+that are affected take a different patch. Refer to the CVE advisory
+for more information.
+
+Bug: https://curl.se/docs/CVE-2023-38545.html
+---
+ lib/socks.c             |  8 +++---
+ tests/data/Makefile.inc |  1 +
+ tests/data/test728      | 71 +++++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 76 insertions(+), 4 deletions(-)
+ create mode 100644 tests/data/test728
+
+diff --git a/lib/socks.c b/lib/socks.c
+index 0fb97e1..74064fe 100644
+--- a/lib/socks.c
++++ b/lib/socks.c
+@@ -521,9 +521,9 @@ CURLcode Curl_SOCKS5(const char *proxy_user,
+
+     /* RFC1928 chapter 5 specifies max 255 chars for domain name in packet */
+     if(!socks5_resolve_local && hostname_len > 255) {
+-      infof(conn->data, "SOCKS5: server resolving disabled for hostnames of "
+-            "length > 255 [actual len=%zu]\n", hostname_len);
+-      socks5_resolve_local = TRUE;
++      failf(data, "SOCKS5: the destination hostname is too long to be "
++            "resolved remotely by the proxy.");
++      return CURLE_COULDNT_RESOLVE_HOST;
+     }
+
+     if(auth & ~(CURLAUTH_BASIC | CURLAUTH_GSSAPI))
+@@ -835,7 +835,7 @@ CURLcode Curl_SOCKS5(const char *proxy_user,
+
+     if(!socks5_resolve_local) {
+       socksreq[len++] = 3; /* ATYP: domain name = 3 */
+-      socksreq[len++] = (char) hostname_len; /* one byte address length */
++      socksreq[len++] = (unsigned char) hostname_len; /* one byte length */
+       memcpy(&socksreq[len], hostname, hostname_len); /* address w/o NULL */
+       len += hostname_len;
+       infof(data, "SOCKS5 connect to %s:%d (remotely resolved)\n",
+diff --git a/tests/data/Makefile.inc b/tests/data/Makefile.inc
+index dfc7432..1281c39 100644
+--- a/tests/data/Makefile.inc
++++ b/tests/data/Makefile.inc
+@@ -89,6 +89,7 @@ test662 test663 \
+ \
+ test700 test701 test702 test703 test704 test705 test706 test707 test708 \
+ test709 test710 test711 test712 test713 test714 test715 test716 test717 \
++test728 \
+ \
+ test800 test801 test802 test803 test804 test805 test806 test807 test808 \
+ test809 test810 test811 test812 test813 test814 test815 test816 test817 \
+diff --git a/tests/data/test728 b/tests/data/test728
+new file mode 100644
+index 0000000..04dc2c7
+--- /dev/null
++++ b/tests/data/test728
+@@ -0,0 +1,71 @@
++<testcase>
++<info>
++<keywords>
++HTTP
++HTTP GET
++SOCKS5
++SOCKS5h
++followlocation
++</keywords>
++</info>
++
++#
++# Server-side
++<reply>
++# The hostname in this redirect is 256 characters and too long (> 255) for
++# SOCKS5 remote resolve. curl must return error CURLE_COULDNT_RESOLVE_HOST in
++# this case.
++<data>
++HTTP/1.1 301 Moved Permanently
++Location: http://AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA/
++Content-Length: 0
++Connection: close
++
++</data>
++</reply>
++
++#
++# Client-side
++<client>
++<features>
++proxy
++</features>
++<server>
++http
++socks5
++</server>
++ <name>
++SOCKS5h with HTTP redirect to hostname too long
++ </name>
++ <command>
++--no-progress-meter --location --proxy socks5h://%HOSTIP:%SOCKSPORT http://%HOSTIP:%HTTPPORT/728
++</command>
++</client>
++
++#
++# Verify data after the test has been "shot"
++<verify>
++<strip>
++^User-Agent:.*
++</strip>
++<strippart>
++s/\r\n$/\n/
++</strippart>
++<protocol>
++GET /728 HTTP/1.1
++Host: %HOSTIP:%HTTPPORT
++Accept: */*
++
++</protocol>
++<errorcode>
++6
++</errorcode>
++# the error message is verified because error code
++# CURLE_COULDNT_RESOLVE_HOST (6) may be returned for any number of reasons and
++# we need to make sure it is specifically for the reason below so that we know
++# the check is working.
++<stderr mode="text">
++curl: (6) SOCKS5: the destination hostname is too long to be resolved remotely by the proxy.
++</stderr>
++</verify>
++</testcase>
+-- 
+2.7.4
+