Expand on the ways to detect if FIPS is enabled or not

Signed-off-by: Pedro Algarvio <palgarvio@vmware.com>

Author: s0undt3ch

requirements/tests.txt

@@ -2,3 +2,4 @@ docker
 pytest-subtests
 pyfakefs==4.4.0; python_version == '3.5'
 pyfakefs; python_version > '3.5'
+cryptography

src/pytestskipmarkers/utils/platform.py

@@ -7,6 +7,8 @@
 ..
     PYTEST_DONT_REWRITE
 """
+import contextlib
+import hashlib
 import multiprocessing
 import os
 import pathlib
@@ -210,23 +212,32 @@ def is_fips_enabled() -> bool:
     ):
         return True
     sysctl_path = shutil.which("sysctl")
-    if not sysctl_path:
-        return False
-    ret = subprocess.run(
-        [sysctl_path, "crypto.fips_enabled"],
-        check=False,
-        shell=False,
-        stdout=subprocess.PIPE,
-        text=True,
-    )
-    if ret.returncode == 0:
-        stripped_output = ret.stdout.strip()
-        if not stripped_output:
-            # No output?
-            return False
-        if "=" not in stripped_output:
-            # Don't know how to parse this
-            return False
-        if stripped_output.split("=")[-1].strip() == "1":
+    if sysctl_path:
+        ret = subprocess.run(
+            [sysctl_path, "crypto.fips_enabled"],
+            check=False,
+            shell=False,
+            stdout=subprocess.PIPE,
+            text=True,
+        )
+        if ret.returncode == 0:
+            stripped_output = ret.stdout.strip()
+            if (
+                stripped_output
+                and "=" in stripped_output
+                and stripped_output.split("=")[-1].strip() == "1"
+            ):
+                return True
+
+    with contextlib.suppress(ImportError):
+        import cryptography.hazmat.backends.openssl.backend
+
+        if cryptography.hazmat.backends.openssl.backend._fips_enabled:
+            return True
+
+    try:
+        hashlib.md5()  # nosec
+    except ValueError as exc:
+        if str(exc) == "[digital envelope routines] unsupported":
             return True
     return False

tests/unit/utils/test_platform.py

@@ -12,6 +12,14 @@
 
 import pytestskipmarkers.utils.platform
 
+try:
+    import cryptography.hazmat.backends.openssl.backend as backend
+
+    cryptography_import_error = ""
+except ImportError as exc:  # pragma: no cover
+    backend = None
+    cryptography_import_error = f"Failed to import cryptography: {exc}"
+
 log = logging.getLogger(__name__)
 
 
@@ -206,6 +214,26 @@ def test_is_fips_enabled_sysctl(output, expected):
         assert pytestskipmarkers.utils.platform.is_fips_enabled() is expected
 
 
+@pytest.mark.skipif(backend is None, reason=cryptography_import_error)
+@pytest.mark.parametrize("fips_enabled", [True, False], ids=lambda x: f"fips_enabled={x}")
+def test_is_fips_enabled_cryptography(fs, fips_enabled):
+    fs.create_file("/proc/sys/crypto/fips_enabled", contents="0")
+    with mock.patch("shutil.which", return_value=None):
+        with mock.patch.object(backend, "_fips_enabled", fips_enabled):
+            assert pytestskipmarkers.utils.platform.is_fips_enabled() is fips_enabled
+
+
+def test_is_fips_by_catch_exception(fs):
+    fs.create_file("/proc/sys/crypto/fips_enabled", contents="0")
+    with mock.patch("shutil.which", return_value=None):
+        with mock.patch("hashlib.md5", return_value="a random md5 hash"):
+            assert pytestskipmarkers.utils.platform.is_fips_enabled() is False
+        with mock.patch(
+            "hashlib.md5", side_effect=ValueError("[digital envelope routines] unsupported")
+        ):
+            assert pytestskipmarkers.utils.platform.is_fips_enabled() is True
+
+
 def test_is_spawning_platform():
     with mock.patch("multiprocessing.get_start_method", return_value="spawn"):
         assert pytestskipmarkers.utils.platform.is_spawning_platform() is True