support/testing: add openssh runtime test

This new runtime test is based on test_dropbear.py. The only required change
is to use "-oStrictHostKeyChecking=no" instead of "-y" to accept the new key.

Since the base test infra only provide a uClibc-ng toolchain, add a second
test using a glibc based internal toolchain.

For example, this allow to trigger the openssh 8.1p bug with glibc 2.31 [1].

[1] https://bugs.archlinux.org/task/65386

Signed-off-by: Romain Naour <romain.naour@smile.fr>
yann.morin.1998@free.fr:
  - deduplicate the whole test
  - don't provide any NIC, we only need and use lo
  - simplify post-build script (append with cat, don't munge with sed)
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

DEVELOPERS

@@ -2244,6 +2244,7 @@ F:	package/waffle/
 F:	package/xenomai/
 F:	package/zziplib/
 F:	support/testing/tests/package/test_glxinfo.py
+F:	support/testing/tests/package/test_openssh.py
 F:	toolchain/
 
 N:	Roman Gorbenkov <roman.gorbenkov@ens2m.org>

support/testing/tests/package/test_openssh.py

@@ -0,0 +1,60 @@
+import os
+
+import infra.basetest
+
+
+class TestOpensshBase(infra.basetest.BRTest):
+    passwd = "testpwd"
+    opensshconfig = \
+        """
+        BR2_TARGET_GENERIC_ROOT_PASSWD="{}"
+        BR2_PACKAGE_OPENSSH=y
+        BR2_PACKAGE_SSHPASS=y
+        BR2_ROOTFS_POST_BUILD_SCRIPT="{}"
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """.format(
+            passwd,
+            infra.filepath("tests/package/test_openssh/post-build.sh"))
+
+    def openssh_test(self):
+        img = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv5",
+                           kernel="builtin",
+                           options=["-initrd", img,
+                                    "-nic", "none"])
+        self.emulator.login(self.passwd)
+
+        cmd = "netstat -ltn 2>/dev/null | grep 0.0.0.0:22"
+        _, exit_code = self.emulator.run(cmd)
+        self.assertEqual(exit_code, 0)
+
+        cmd = "sshpass -p {} ssh -oStrictHostKeyChecking=no localhost /bin/true".format(self.passwd)
+        _, exit_code = self.emulator.run(cmd)
+        self.assertEqual(exit_code, 0)
+
+
+class TestOpenSshuClibc(TestOpensshBase):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        TestOpensshBase.opensshconfig + \
+        """
+        BR2_TARGET_ROOTFS_CPIO=y
+        """
+
+    def test_run(self):
+        self.openssh_test()
+
+
+class TestOpenSshGlibc(TestOpensshBase):
+    config = \
+        TestOpensshBase.opensshconfig + \
+        """
+        BR2_arm=y
+        BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
+        BR2_KERNEL_HEADERS_4_19=y
+        BR2_TOOLCHAIN_BUILDROOT_CXX=y
+        BR2_PACKAGE_RNG_TOOLS=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        """
+
+    def test_run(self):
+        self.openssh_test()

support/testing/tests/package/test_openssh/post-build.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+cat <<_EOF_ >>"${TARGET_DIR}/etc/ssh/sshd_config"
+PermitRootLogin yes
+PasswordAuthentication yes
+_EOF_