tests: Update SSL network tests to use SSLContext, and work on CPython.

Changes are:
- use ssl.SSLContext.wrap_socket instead of ssl.wrap_socket
- disable check_hostname and call load_default_certs() where appropriate,
  to get CPython to run the tests correctly
- pass socket.AF_INET to getaddrinfo and socket.socket(), to force IPv4
- change tests to use github.com instead of google.com, because certificate
  validation was failing with google.com
Signed-off-by: Damien George <damien@micropython.org>

tests/net_hosted/connect_nonblock_xfer.py

@@ -27,11 +27,12 @@ def do_connect(peer_addr, tls, handshake):
             print("  got", er.errno)
     # wrap with ssl/tls if desired
     if tls:
+        ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+        if hasattr(ssl_context, "check_hostname"):
+            ssl_context.check_hostname = False
+
         try:
-            if sys.implementation.name == "micropython":
-                s = ssl.wrap_socket(s, do_handshake=handshake)
-            else:
-                s = ssl.wrap_socket(s, do_handshake_on_connect=handshake)
+            s = ssl_context.wrap_socket(s, do_handshake_on_connect=handshake)
             print("wrap: True")
         except Exception as e:
             dp(e)

tests/net_inet/ssl_errors.py

 # test that socket.connect() on a non-blocking socket raises EINPROGRESS
 # and that an immediate write/send/read/recv does the right thing
 
-import sys, errno, socket, ssl
+import sys, errno, select, socket, ssl
 
 
 def test(addr, hostname, block=True):
-    print("---", hostname or addr)
-    s = socket.socket()
+    print("---", hostname)
+    s = socket.socket(socket.AF_INET)
     s.setblocking(block)
     try:
         s.connect(addr)
@@ -16,11 +16,15 @@ def test(addr, hostname, block=True):
             raise
         print("EINPROGRESS")
 
+    if sys.implementation.name != "micropython":
+        # in CPython we have to wait, otherwise wrap_socket is not happy
+        select.select([], [s], [])
+
+    ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+    ssl_context.verify_mode = ssl.CERT_REQUIRED
+
     try:
-        if sys.implementation.name == "micropython":
-            s = ssl.wrap_socket(s, do_handshake=block)
-        else:
-            s = ssl.wrap_socket(s, do_handshake_on_connect=block)
+        s = ssl_context.wrap_socket(s, do_handshake_on_connect=block, server_hostname=hostname)
         print("wrap: True")
     except OSError:
         print("wrap: error")
@@ -36,11 +40,11 @@ def test(addr, hostname, block=True):
 
 if __name__ == "__main__":
     # connect to plain HTTP port, oops!
-    addr = socket.getaddrinfo("micropython.org", 80)[0][-1]
-    test(addr, None)
+    addr = socket.getaddrinfo("micropython.org", 80, socket.AF_INET)[0][-1]
+    test(addr, "micropython.org")
     # connect to plain HTTP port, oops!
-    addr = socket.getaddrinfo("micropython.org", 80)[0][-1]
-    test(addr, None, False)
+    addr = socket.getaddrinfo("micropython.org", 80, socket.AF_INET)[0][-1]
+    test(addr, "micropython.org", False)
     # connect to server with self-signed cert, oops!
-    addr = socket.getaddrinfo("test.mosquitto.org", 8883)[0][-1]
+    addr = socket.getaddrinfo("test.mosquitto.org", 8883, socket.AF_INET)[0][-1]
     test(addr, "test.mosquitto.org")

tests/net_inet/test_tls_nonblock.py

@@ -2,12 +2,12 @@ import socket, ssl, errno, sys, time, select
 
 
 def test_one(site, opts):
-    ai = socket.getaddrinfo(site, 443)
+    ai = socket.getaddrinfo(site, 443, socket.AF_INET)
     addr = ai[0][-1]
-    print(addr)
+    print(site)
 
     # Connect the raw socket
-    s = socket.socket()
+    s = socket.socket(socket.AF_INET)
     s.setblocking(False)
     try:
         s.connect(addr)
@@ -16,17 +16,22 @@ def test_one(site, opts):
         if e.errno != errno.EINPROGRESS:
             raise
 
+    # Create SSLContext.
+    ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+
+    # CPython compatibility:
+    # - disable check_hostname
+    # - load default system certificate chain
+    # - must wait for socket to be writable before calling wrap_socket
     if sys.implementation.name != "micropython":
-        # in CPython we have to wait, otherwise wrap_socket is not happy
+        ssl_context.check_hostname = False
+        ssl_context.load_default_certs()
         select.select([], [s], [])
 
     try:
         # Wrap with SSL
         try:
-            if sys.implementation.name == "micropython":
-                s = ssl.wrap_socket(s, do_handshake=False)
-            else:
-                s = ssl.wrap_socket(s, do_handshake_on_connect=False)
+            s = ssl_context.wrap_socket(s, do_handshake_on_connect=False)
         except OSError as e:
             if e.errno != errno.EINPROGRESS:
                 raise
@@ -87,8 +92,7 @@ def test_one(site, opts):
 
 
 SITES = [
-    "google.com",
-    {"host": "www.google.com"},
+    "www.github.com",
     "micropython.org",
     "pypi.org",
     {"host": "api.pushbullet.com", "sni": True},
@@ -105,7 +109,7 @@ def main():
             test_one(site, opts)
             print(site, "ok")
         except Exception as e:
-            print(site, "error")
+            print(site, "error", e)
     print("DONE")
 
 

tests/net_inet/test_tls_sites.py

+import sys
+import select
 import socket
 import ssl
 
-# CPython only supports server_hostname with SSLContext
-if hasattr(ssl, "SSLContext"):
-    ssl = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
-
 
 def test_one(site, opts):
-    ai = socket.getaddrinfo(site, 443)
+    ai = socket.getaddrinfo(site, 443, socket.AF_INET)
     addr = ai[0][-1]
 
-    s = socket.socket()
+    s = socket.socket(socket.AF_INET)
+
+    # Create SSLContext.
+    ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+
+    # CPython compatibility:
+    # - disable check_hostname
+    # - load default system certificate chain
+    # - must wait for socket to be writable before calling wrap_socket
+    if sys.implementation.name != "micropython":
+        ssl_context.check_hostname = False
+        ssl_context.load_default_certs()
+        select.select([], [s], [])
 
     try:
         s.connect(addr)
 
         if "sni" in opts:
-            s = ssl.wrap_socket(s, server_hostname=opts["host"])
+            s = ssl_context.wrap_socket(s, server_hostname=opts["host"])
         else:
-            s = ssl.wrap_socket(s)
+            s = ssl_context.wrap_socket(s)
 
         s.write(b"GET / HTTP/1.0\r\nHost: %s\r\n\r\n" % bytes(site, "latin"))
         resp = s.read(4096)
@@ -31,8 +41,7 @@ def test_one(site, opts):
 
 
 SITES = [
-    "google.com",
-    "www.google.com",
+    "www.github.com",
     "micropython.org",
     "pypi.org",
     {"host": "api.pushbullet.com", "sni": True},

tests/net_inet/test_tls_sites.py.exp

-google.com ok
-www.google.com ok
-micropython.org ok
-pypi.org ok
-api.pushbullet.com ok

tests/net_inet/tls_text_errors.py

 # test that modtls produces a text error message
 
-import socket, ssl, sys
+import socket, ssl
 
 
 def test(addr):
     s = socket.socket()
     s.connect(addr)
     try:
-        s = ssl.wrap_socket(s)
+        ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+        if hasattr(ssl_context, "check_hostname"):
+            # Disable hostname check on CPython.
+            ssl_context.check_hostname = False
+        s = ssl_context.wrap_socket(s)
         print("wrap: no exception")
     except OSError as e:
         # mbedtls produces "mbedtls -0x7200: SSL - An invalid SSL record was received"