Trust Any Certificate Docs (#1744)

* Added readme + change in sidebars.js

Author: almog2296

docs/integrations/Trust-any-certificate.md

@@ -0,0 +1,103 @@
+# Trust Any Certificate
+
+## Overview
+
+Enabling “Trust Any Certificate” in an integration disables certificate validation and uses less-hardened SSL standards.
+
+## Code usage
+
+When constructing the `BaseClient` in your integrations, set `verify=False` to disable SSL checks and allow legacy ciphers:
+
+```python
+from CommonServerPython import BaseClient
+
+client = BaseClient(
+    base_url="https://api.example.com",
+    verify=False
+)
+response = client._http_request(...)
+```
+
+## How it works
+
+### _http_request()
+
+In the implementation of `_http_request`, the verify parameter is passed to the underlying HTTP request from the `BaseClient`:
+
+```python
+class BaseClient:
+    ...
+    def _http_request():
+        ...
+        res = self._session.request(..., verify=self._verify)
+```
+
+When `self._verify` is set to False, SSL certificate verification is disabled. This means the client will accept insecure certificates.
+
+### Skip Certificate Verification
+
+When `verify=False` is set, the following function is triggered to delete certificate environment variables.
+This ensures that no extra CA bundles are loaded.
+For requests versions earlier than 2.28, this step is necessary to fully disable certificate validation in addition to passing the `self._verify` to the session.request.
+
+```python
+def skip_cert_verification()
+    for k in ('REQUESTS_CA_BUNDLE', 'CURL_CA_BUNDLE'):
+        if k in os.environ:
+            del os.environ[k]
+```
+
+### Python 3.10+ & Custom SSLAdapter
+
+Python 3.10 increased OpenSSL’s default security level to 2, which rejects many older cipher suites and breaks connections to legacy servers ([see CPython PR #25778](https://github.com/python/cpython/pull/25778)).
+To mitigate this, `BaseClient` mounts a custom SSL adapter when `verify=False`:
+
+```python
+if IS_PY3 and PY_VER_MINOR >= 10 and not verify:
+    self._session.mount('https://', SSLAdapter(verify=verify))
+```
+
+### SSLAdapter
+
+When `verify=False` on Python 3.10+, `SSLAdapter` creates a custom `ssl.SSLContext` that:
+
+1. **Disables hostname checks:**  
+
+   ```python
+    if not verify and IS_PY3:
+        self.context.check_hostname = False
+    ```
+
+2. **Enabling Legacy TLS Renegotiation:**
+
+    ```python
+    if not verify and ssl.OPENSSL_VERSION_INFO >= (3, 0, 0):
+        self.context.options |= ssl.OP_LEGACY_SERVER_CONNECT
+    ```
+
+   The OP_LEGACY_SERVER_CONNECT flag tells OpenSSL to allow legacy TLS renegotiation. Relevant when a server doesn’t support the secure‐renegotiation extension (RFC 5746).
+
+3. **Lowers OpenSSL security level to 1 & Enables a [cipher list](https://github.com/demisto/content/blob/e3807159cae86ac30ecbb3c51ec82dbac7512d3d/Packs/Base/Scripts/CommonServerPython/CommonServerPython.py#L9127)**  
+
+   ```python
+   CIPHERS_STRING = (
+       '@SECLEVEL=1:'
+       'ECDHE+AESGCM:'
+       'ECDHE+CHACHA20:'
+       'DHE+AESGCM:'
+       'DHE+CHACHA20:'
+       'ECDH+AESGCM:'
+       'DH+AESGCM:'
+       'ECDH+AES:'
+       'DH+AES:'
+       'RSA+AESGCM:'
+       'RSA+AES:'
+       '!aNULL:'
+       '!eNULL:'
+       '!MD5:'
+       '!DSS'
+   )
+   context = create_urllib3_context(ciphers=CIPHERS_STRING)
+   ```
+
+This configuration restores legacy ciphers (excluding null, MD5, DSS).

sidebars.js

@@ -159,6 +159,7 @@ const sidebars = {
             "integrations/scheduled-commands",
             "integrations/yml-from-python-code-gen",
             "integrations/fetch-incidents-lookback",
+            "integrations/Trust-any-certificate",
           ]
         }
       ]