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Validates an Azure client secret by checking for placeholder values, minimum length requirements, and common invalid patterns.

Purpose

This function performs validation checks on an Azure AD application client secret to ensure it has been properly configured and is not using default/placeholder values. It helps catch common configuration errors before attempting to authenticate with Azure services. The function returns a tuple indicating validation success/failure along with a descriptive message.

Source Code

def validate_azure_client_secret(client_secret):
    """Validate Azure client secret."""
    if not client_secret or client_secret == "your-azure-app-client-secret":
        return False, "Please update AZURE_CLIENT_SECRET with your Azure AD app's client secret"
    
    if len(client_secret) < 10:
        return False, "Client secret seems too short. Make sure you copied the full secret value"
    
    if "your-" in client_secret or "example" in client_secret.lower():
        return False, "Please replace with your actual client secret value"
    
    return True, "Azure Client Secret appears to be set"

Parameters

Parameter Details

client_secret: The Azure AD application client secret string to validate. Expected to be a non-empty string containing the actual secret value obtained from Azure portal. Should be at least 10 characters long and not contain placeholder text like 'your-' or 'example'.

Return Value

Returns a tuple of (bool, str). The first element is True if validation passes, False otherwise. The second element is a string message describing the validation result or error. Possible return values: (False, 'Please update AZURE_CLIENT_SECRET...') if empty or default value; (False, 'Client secret seems too short...') if less than 10 characters; (False, 'Please replace with your actual...') if contains placeholder text; (True, 'Azure Client Secret appears to be set') if all validations pass.

Usage Example

# Example 1: Invalid placeholder value
is_valid, message = validate_azure_client_secret('your-azure-app-client-secret')
print(f"Valid: {is_valid}, Message: {message}")
# Output: Valid: False, Message: Please update AZURE_CLIENT_SECRET with your Azure AD app's client secret

# Example 2: Too short
is_valid, message = validate_azure_client_secret('abc123')
print(f"Valid: {is_valid}, Message: {message}")
# Output: Valid: False, Message: Client secret seems too short. Make sure you copied the full secret value

# Example 3: Valid secret
is_valid, message = validate_azure_client_secret('a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6')
print(f"Valid: {is_valid}, Message: {message}")
# Output: Valid: True, Message: Azure Client Secret appears to be set

# Example 4: Using with environment variable
import os
client_secret = os.getenv('AZURE_CLIENT_SECRET', '')
is_valid, message = validate_azure_client_secret(client_secret)
if not is_valid:
    print(f"Configuration error: {message}")
    sys.exit(1)

Best Practices

• Always validate the client secret before attempting Azure authentication to provide clear error messages
• Use this function during application startup or configuration loading to fail fast with helpful messages
• The function checks for common mistakes but does not verify if the secret is actually valid with Azure - actual authentication is still required
• Consider logging validation failures (without logging the actual secret value) for debugging purposes
• This validation is a first-line defense; always handle authentication errors gracefully in production code
• Never log or display the actual client secret value in error messages or logs

Tags

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