Sanitize SSH key whitespace to prevent validation errors (#16179)

Strip leading and trailing whitespace from SSH keys in validate_ssh_private_key()
to handle common copy-paste scenarios where hidden newlines cause base64 decoding
failures.

Changes:
- Added data.strip() in validate_ssh_private_key() before calling validate_pem()
- Added test_ssh_key_with_whitespace() to verify keys with leading/trailing
  newlines are properly sanitized and validated

This prevents the confusing "HTTP 500: Internal Server Error" and
"binascii.Error: Incorrect padding" errors when users paste SSH keys with
accidental whitespace.

Fixes #14219

Signed-off-by: Joey Washburn <joey@joeywashburn.com>

awx/main/tests/unit/test_validators.py

@@ -132,6 +132,25 @@ def test_cert_with_key():
     assert not pem_objects[1]['key_enc']
 
 
+def test_ssh_key_with_whitespace():
+    # Test that SSH keys with leading/trailing whitespace/newlines are properly sanitized
+    # This addresses issue #14219 where copy-paste can introduce hidden newlines
+    valid_key_with_whitespace = "\n\n" + TEST_SSH_KEY_DATA + "\n\n"
+    pem_objects = validate_ssh_private_key(valid_key_with_whitespace)
+    assert pem_objects[0]['key_type'] == 'rsa'
+    assert not pem_objects[0]['key_enc']
+
+    # Test with just leading whitespace
+    valid_key_leading = "\n\n\n" + TEST_SSH_KEY_DATA
+    pem_objects = validate_ssh_private_key(valid_key_leading)
+    assert pem_objects[0]['key_type'] == 'rsa'
+
+    # Test with just trailing whitespace
+    valid_key_trailing = TEST_SSH_KEY_DATA + "\n\n\n"
+    pem_objects = validate_ssh_private_key(valid_key_trailing)
+    assert pem_objects[0]['key_type'] == 'rsa'
+
+
 @pytest.mark.parametrize(
     "var_str",
     [

awx/main/validators.py

@@ -181,6 +181,8 @@ def validate_ssh_private_key(data):
     certificates; should handle any valid options for ssh_private_key on a
     credential.
     """
+    # Strip leading and trailing whitespace/newlines to handle common copy-paste issues
+    data = data.strip()
     return validate_pem(data, min_keys=1)