Adding Windows (cygwin) CI (#101)

* initial appveyor CI

* increase stack for McEliece

* add stack-size build instructions/warnings to documentation

README.md

@@ -75,7 +75,7 @@ For each `<KEX>` listed above, the following hybrid algorithms are made availabl
 - If `<KEX>` has L3 security, the method `ecdh-nistp384-<KEX>` is available, which combines `<KEX>` with ECDH using NIST's P384 curve
 - If `<KEX>` has L5 security, the method `ecdh-nistp521-<KEX>` is available, which combines `<KEX>` with ECDH using NIST's P521 curve
 
-Note that algorithms marked with a dagger (†) have large stack usage and may cause failures when run on threads or in constrained environments.
+Note that algorithms marked with a dagger (†) have large stack usage and may cause failures when run on threads or in constrained environments. For example, McEliece require building `oqs-openssh` with a large(r) stack provision than is default: Adding `LDFLAGS="-Wl,--stack,20000000"` to [the `./configure` command below](#step-2-build-the-fork) is required to allow cygwin-based testing to pass.
 
 #### Digital Signature
 

appveyor.yml

@@ -0,0 +1,36 @@
+version: 1.0.{build}
+
+# TODO: Add MSVC support
+image: Visual Studio 2019
+
+platform: x64
+
+environment:
+  matrix:
+    - BUILD_SHARED: OFF
+      COMPILER: cygwin
+
+for:
+  - matrix:
+      only:
+        - OQS_USE_OPENSSL: OFF
+    before_build:
+      - cmd: |-
+             choco install openssl
+             choco install -y strawberryperl
+             SET "OPENSSL_ROOT_DIR=C:\OpenSSL-Win64"
+
+build_script:
+  - cmd: '%APPVEYOR_BUILD_FOLDER%\appveyor_build.bat'
+
+before_test:
+  - cmd: |-
+         SET "PATH=C:\Python37;C:\Python37\Scripts;%PATH%"
+         pip.exe install pytest pytest-xdist psutil
+
+test_script:
+  - cmd: |-
+         cd %APPVEYOR_BUILD_FOLDER%
+         echo "%PATH%"
+         set PATH=%cd%;c:\cygwin64\bin;%PATH% && echo %PATH% && python oqs-test/try_connection.py doone
+

appveyor_build.bat

@@ -0,0 +1,5 @@
+IF %COMPILER%==cygwin (
+    @echo on
+    SET "PATH=C:\cywin64\bin;c:\cygwin64;%PATH%"
+    c:\cygwin64\bin\bash.exe -lc "setup-x86_64.exe -qnNdO -R C:/cygwin64 -l C:/cygwin/var/cache/setup -P openssl -P libssl-devel -P zlib -P zlib-devel -P ninja -P cmake -P gcc -P make -P autoconf && cd ${APPVEYOR_BUILD_FOLDER} && openssl version && cygcheck -c && pwd && git clone --depth 1 --branch main https://github.com/open-quantum-safe/liboqs.git && cd liboqs && mkdir build && cd build && cmake .. -GNinja -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DCMAKE_INSTALL_PREFIX=${APPVEYOR_BUILD_FOLDER}/oqs -DOQS_BUILD_ONLY_LIB=ON && ninja -v && ninja install && cd ${APPVEYOR_BUILD_FOLDER} && mkdir -p -m 0755 /var/empty && export LIBOQS_INSTALL=`pwd`/oqs && autoreconf && LDFLAGS=\"-Wl,--stack,20000000\" ./configure --with-liboqs-dir=`pwd`/oqs --with-libs=-lm && make && make install && TEST_SSH_UNSAFE_PERMISSIONS=1 make tests LTESTS=\"\" "
+)

regress/Makefile

@@ -229,6 +229,7 @@ t-exec-interop:	${INTEROP_TESTS:=.sh}
 	@if [ "x$?" = "x" ]; then exit 0; fi; \
 	for TEST in ""$?; do \
 		echo "run test $${TEST}" ... 1>&2; \
+		chmod go-rwx .; \
 		(env SUDO="${SUDO}" TEST_ENV=${TEST_ENV} ${TEST_SHELL} ${.CURDIR}/test-exec.sh ${.OBJDIR} ${.CURDIR}/$${TEST}) || exit $$?; \
 	done
 

regress/test-exec.sh

@@ -575,6 +575,9 @@ for t in ${SSH_HOSTKEY_TYPES}; do
 
 	# use key as host key, too
 	$SUDO cp $OBJ/$t $OBJ/host.$t
+	# ensure proper file access permissions even in cygwin:
+	$SUDO chmod 600 $OBJ/$t $OBJ/host.$t
+
 	echo HostKey $OBJ/host.$t >> $OBJ/sshd_config
 
 	# don't use SUDO for proxy connect