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‎msal-key-attestation/README.md‎

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# msal-key-attestation
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KeyGuard attestation support for **MSAL Python** MSI v2 (mTLS Proof-of-Possession).
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This package provides the `AttestationClientLib.dll` bindings for Windows
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Credential Guard / KeyGuard key attestation via Azure Attestation (MAA).
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## Installation
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```bash
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pip install msal msal-key-attestation
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```
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## Prerequisites
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- **Windows** with Credential Guard / KeyGuard enabled (Azure VM with VBS)
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- **AttestationClientLib.dll** — place it next to your application, or set
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`ATTESTATION_CLIENTLIB_PATH` environment variable to its full path.
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## Usage
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```python
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import msal, requests
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client = msal.ManagedIdentityClient(
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msal.SystemAssignedManagedIdentity(),
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http_client=requests.Session(),
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)
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# with_attestation_support=True auto-discovers msal-key-attestation
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result = client.acquire_token_for_client(
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resource="https://graph.microsoft.com",
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mtls_proof_of_possession=True,
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with_attestation_support=True,
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)
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if "access_token" in result:
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print(f"Token type: {result['token_type']}") # mtls_pop
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print(f"Cert thumbprint: {result.get('cert_thumbprint_sha256', 'N/A')}")
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else:
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print(f"Error: {result.get('error_description', result)}")
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```
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## How it works
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1. MSAL Python's MSI v2 flow creates a KeyGuard-protected RSA key (via NCrypt)
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2. When `with_attestation_support=True`, MSAL auto-imports this package
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3. This package calls `AttestationClientLib.dll` to attest the key with MAA
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4. The attestation JWT is cached in-memory (~90% of its lifetime)
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5. MSAL sends the JWT + CSR to IMDS `/issuecredential`
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6. IMDS returns a short-lived certificate, which MSAL uses for mTLS token
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acquisition
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## Architecture
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```
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┌─────────────────────────────────────────┐
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│ msal (pip install msal) │
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│ │
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│ ManagedIdentityClient │
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│ └─ acquire_token_for_client() │
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│ mtls_proof_of_possession=True │
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│ with_attestation_support=True │
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│ │
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│ msal.msi_v2 (core flow) │
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│ - NCrypt KeyGuard key (ctypes) │
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│ - PKCS#10 CSR builder │
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│ - IMDS getplatformmetadata │
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│ - IMDS issuecredential │
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│ - Crypt32 cert binding │
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│ - WinHTTP/SChannel mTLS │
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│ - Certificate cache (in-memory) │
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└────────────────┬────────────────────────┘
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│ auto-discovers via import
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┌────────────────▼────────────────────────┐
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│ msal-key-attestation │
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│ (pip install msal-key-attestation) │
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│ │
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│ create_attestation_provider() │
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│ - AttestationClientLib.dll bindings │
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│ - MAA token cache (in-memory) │
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└─────────────────────────────────────────┘
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```
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## Environment Variables
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| Variable | Description |
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|---|---|
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| `ATTESTATION_CLIENTLIB_PATH` | Full path to `AttestationClientLib.dll` |
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| `MSAL_MSI_V2_ATTESTATION_CACHE` | `"0"` to disable MAA JWT caching |
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## License
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MIT

‎msal-key-attestation/msal_key_attestation.egg-info/PKG-INFO‎

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Metadata-Version: 2.4
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Name: msal-key-attestation
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Version: 0.1.0
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Summary: KeyGuard attestation support for MSAL Python MSI v2 (mTLS PoP). Provides AttestationClientLib.dll bindings for Windows Credential Guard key attestation.
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Home-page: https://github.com/AzureAD/microsoft-authentication-library-for-python
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Author: Microsoft Corporation
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Author-email: nugetaad@microsoft.com
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License: MIT
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Classifier: Development Status :: 3 - Alpha
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Classifier: Programming Language :: Python :: 3 :: Only
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Classifier: Programming Language :: Python :: 3
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Classifier: Programming Language :: Python :: 3.8
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Classifier: Programming Language :: Python :: 3.9
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Classifier: Programming Language :: Python :: 3.10
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Classifier: Programming Language :: Python :: 3.11
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Classifier: Programming Language :: Python :: 3.12
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Classifier: Programming Language :: Python :: 3.13
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Classifier: Programming Language :: Python :: 3.14
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Classifier: License :: OSI Approved :: MIT License
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Classifier: Operating System :: Microsoft :: Windows
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Requires-Python: >=3.8
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Description-Content-Type: text/markdown
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Requires-Dist: msal>=1.32.0
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# msal-key-attestation
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KeyGuard attestation support for **MSAL Python** MSI v2 (mTLS Proof-of-Possession).
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This package provides the `AttestationClientLib.dll` bindings for Windows
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Credential Guard / KeyGuard key attestation via Azure Attestation (MAA).
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## Installation
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```bash
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pip install msal msal-key-attestation
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```
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## Prerequisites
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- **Windows** with Credential Guard / KeyGuard enabled (Azure VM with VBS)
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- **AttestationClientLib.dll** — place it next to your application, or set
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`ATTESTATION_CLIENTLIB_PATH` environment variable to its full path.
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## Usage
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```python
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import msal, requests
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client = msal.ManagedIdentityClient(
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msal.SystemAssignedManagedIdentity(),
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http_client=requests.Session(),
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)
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# with_attestation_support=True auto-discovers msal-key-attestation
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result = client.acquire_token_for_client(
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resource="https://graph.microsoft.com",
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mtls_proof_of_possession=True,
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with_attestation_support=True,
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)
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if "access_token" in result:
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print(f"Token type: {result['token_type']}") # mtls_pop
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print(f"Cert thumbprint: {result.get('cert_thumbprint_sha256', 'N/A')}")
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else:
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print(f"Error: {result.get('error_description', result)}")
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```
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## How it works
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1. MSAL Python's MSI v2 flow creates a KeyGuard-protected RSA key (via NCrypt)
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2. When `with_attestation_support=True`, MSAL auto-imports this package
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3. This package calls `AttestationClientLib.dll` to attest the key with MAA
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4. The attestation JWT is cached in-memory (~90% of its lifetime)
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5. MSAL sends the JWT + CSR to IMDS `/issuecredential`
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6. IMDS returns a short-lived certificate, which MSAL uses for mTLS token
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acquisition
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## Architecture
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```
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┌─────────────────────────────────────────┐
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│ msal (pip install msal) │
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│ │
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│ ManagedIdentityClient │
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│ └─ acquire_token_for_client() │
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│ mtls_proof_of_possession=True │
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│ with_attestation_support=True │
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│ │
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│ msal.msi_v2 (core flow) │
90+
│ - NCrypt KeyGuard key (ctypes) │
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│ - PKCS#10 CSR builder │
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│ - IMDS getplatformmetadata │
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│ - IMDS issuecredential │
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│ - Crypt32 cert binding │
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│ - WinHTTP/SChannel mTLS │
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│ - Certificate cache (in-memory) │
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└────────────────┬────────────────────────┘
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│ auto-discovers via import
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┌────────────────▼────────────────────────┐
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│ msal-key-attestation │
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│ (pip install msal-key-attestation) │
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│ │
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│ create_attestation_provider() │
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│ - AttestationClientLib.dll bindings │
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│ - MAA token cache (in-memory) │
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└─────────────────────────────────────────┘
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```
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## Environment Variables
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| Variable | Description |
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|---|---|
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| `ATTESTATION_CLIENTLIB_PATH` | Full path to `AttestationClientLib.dll` |
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| `MSAL_MSI_V2_ATTESTATION_CACHE` | `"0"` to disable MAA JWT caching |
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## License
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MIT

‎msal-key-attestation/msal_key_attestation.egg-info/SOURCES.txt‎

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README.md
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setup.cfg
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setup.py
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msal_key_attestation/__init__.py
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msal_key_attestation/attestation.py
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msal_key_attestation.egg-info/PKG-INFO
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msal_key_attestation.egg-info/SOURCES.txt
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msal_key_attestation.egg-info/dependency_links.txt
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msal_key_attestation.egg-info/requires.txt
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msal_key_attestation.egg-info/top_level.txt
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tests/__init__.py
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tests/test_attestation.py

‎msal-key-attestation/msal_key_attestation.egg-info/dependency_links.txt‎

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‎msal-key-attestation/msal_key_attestation.egg-info/requires.txt‎

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msal>=1.32.0

‎msal-key-attestation/msal_key_attestation.egg-info/top_level.txt‎

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msal_key_attestation
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tests

‎msal-key-attestation/msal_key_attestation/__init__.py‎

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# Copyright (c) Microsoft Corporation.
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# All rights reserved.
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#
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# This code is licensed under the MIT License.
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"""
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msal-key-attestation — KeyGuard attestation support for MSAL Python MSI v2.
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This package provides the ``create_attestation_provider()`` function that
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returns a callable suitable for the ``attestation_token_provider`` parameter
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in ``msal.msi_v2.obtain_token()``.
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It loads the Windows-only ``AttestationClientLib.dll`` (Azure Attestation
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native library) via ctypes and exposes a high-level API that:
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- Initializes the native attestation library
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- Calls ``AttestKeyGuardImportKey`` with the CNG key handle
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- Returns the attestation JWT
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- Caches the JWT in-memory until ~90 % of its lifetime
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Usage::
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from msal_key_attestation import create_attestation_provider
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# Pass to MSAL's MSI v2 flow:
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result = client.acquire_token_for_client(
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resource="https://graph.microsoft.com",
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mtls_proof_of_possession=True,
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with_attestation_support=True, # auto-discovers this package
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)
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# Or use the provider directly:
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provider = create_attestation_provider()
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jwt = provider(attestation_endpoint, key_handle_int, client_id)
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"""
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__version__ = "0.1.0"
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from .attestation import create_attestation_provider, get_attestation_jwt
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__all__ = ["create_attestation_provider", "get_attestation_jwt"]

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