|
| 1 | +#!/usr/bin/env python3 |
| 2 | +"""Assign SQL roles for Azure AD principals (managed identities/service principals) using Azure AD token auth. |
| 3 | +
|
| 4 | +Simplified: requires --server and --database provided explicitly (no Key Vault lookup). |
| 5 | +Roles JSON format (single arg): |
| 6 | +[ |
| 7 | + {"clientId":"<guid>", "displayName":"Name", "role":"db_datareader"}, |
| 8 | + {"clientId":"<guid>", "displayName":"Name", "role":"db_datawriter"} |
| 9 | +] |
| 10 | +
|
| 11 | +Uses pyodbc + azure-identity (AzureCliCredential).""" |
| 12 | +import argparse |
| 13 | +import json |
| 14 | +import struct |
| 15 | +import sys |
| 16 | +from typing import List, Dict |
| 17 | + |
| 18 | +import pyodbc |
| 19 | +from azure.identity import AzureCliCredential |
| 20 | + |
| 21 | +SQL_COPT_SS_ACCESS_TOKEN = 1256 # msodbcsql.h constant |
| 22 | + |
| 23 | + |
| 24 | +def build_sql(role_items: List[Dict]) -> str: |
| 25 | + statements = [] |
| 26 | + for idx, item in enumerate(role_items, start=1): |
| 27 | + client_id = item["clientId"].strip() |
| 28 | + display_name = item["displayName"].replace("'", "''") |
| 29 | + role = item["role"].strip() |
| 30 | + # Construct dynamic SQL similar to prior bash script |
| 31 | + stmt = f""" |
| 32 | +DECLARE @username{idx} nvarchar(max) = N'{display_name}'; |
| 33 | +DECLARE @clientId{idx} uniqueidentifier = '{client_id}'; |
| 34 | +DECLARE @sid{idx} NVARCHAR(max) = CONVERT(VARCHAR(max), CONVERT(VARBINARY(16), @clientId{idx}), 1); |
| 35 | +DECLARE @cmd{idx} NVARCHAR(max) = N'CREATE USER [' + @username{idx} + '] WITH SID = ' + @sid{idx} + ', TYPE = E;'; |
| 36 | +IF NOT EXISTS (SELECT * FROM sys.database_principals WHERE name = @username{idx}) |
| 37 | +BEGIN |
| 38 | + EXEC(@cmd{idx}) |
| 39 | +END |
| 40 | +EXEC sp_addrolemember '{role}', @username{idx}; |
| 41 | +""".strip() |
| 42 | + statements.append(stmt) |
| 43 | + return "\n".join(statements) |
| 44 | + |
| 45 | + |
| 46 | +def connect_with_token(server: str, database: str, credential: AzureCliCredential): |
| 47 | + token_bytes = credential.get_token("https://database.windows.net/.default").token.encode("utf-16-le") |
| 48 | + token_struct = struct.pack(f"<I{len(token_bytes)}s", len(token_bytes), token_bytes) |
| 49 | + for driver in ["{ODBC Driver 18 for SQL Server}", "{ODBC Driver 17 for SQL Server}"]: |
| 50 | + try: |
| 51 | + conn_str = f"DRIVER={driver};SERVER={server};DATABASE={database};" |
| 52 | + return pyodbc.connect(conn_str, attrs_before={SQL_COPT_SS_ACCESS_TOKEN: token_struct}) |
| 53 | + except pyodbc.Error: |
| 54 | + continue |
| 55 | + raise RuntimeError("Unable to connect using ODBC Driver 18 or 17. Install driver msodbcsql17/18.") |
| 56 | + |
| 57 | + |
| 58 | +def execute_sql(conn, sql: str): |
| 59 | + cursor = conn.cursor() |
| 60 | + # Split on GO batches if present (simple handling) |
| 61 | + batches = [] |
| 62 | + current = [] |
| 63 | + for line in sql.splitlines(): |
| 64 | + if line.strip().upper() == "GO": |
| 65 | + if current: |
| 66 | + batches.append("\n".join(current)) |
| 67 | + current = [] |
| 68 | + else: |
| 69 | + current.append(line) |
| 70 | + if current: |
| 71 | + batches.append("\n".join(current)) |
| 72 | + |
| 73 | + for batch in batches: |
| 74 | + if batch.strip(): |
| 75 | + cursor.execute(batch) |
| 76 | + conn.commit() |
| 77 | + cursor.close() |
| 78 | + |
| 79 | + |
| 80 | +def main(): |
| 81 | + parser = argparse.ArgumentParser(description="Assign SQL roles for Azure AD principals.") |
| 82 | + parser.add_argument("--server", required=True, help="SQL server FQDN (e.g. myserver.database.windows.net)") |
| 83 | + parser.add_argument("--database", required=True, help="Database name") |
| 84 | + parser.add_argument("--roles-json", required=True, help="JSON array of role assignment objects") |
| 85 | + args = parser.parse_args() |
| 86 | + |
| 87 | + try: |
| 88 | + role_items = json.loads(args.roles_json) |
| 89 | + if not isinstance(role_items, list): |
| 90 | + raise ValueError("roles-json must be a JSON array") |
| 91 | + except (json.JSONDecodeError, ValueError, KeyError) as e: |
| 92 | + print(f"Error parsing roles-json: {e}", file=sys.stderr) |
| 93 | + return 1 |
| 94 | + |
| 95 | + credential = AzureCliCredential() |
| 96 | + |
| 97 | + try: |
| 98 | + server, database = args.server, args.database |
| 99 | + print(f"Target SQL: {server} / {database}") |
| 100 | + sql = build_sql(role_items) |
| 101 | + conn = connect_with_token(server, database, credential) |
| 102 | + print("Connected. Assigning roles...") |
| 103 | + execute_sql(conn, sql) |
| 104 | + conn.close() |
| 105 | + print("Role assignment completed successfully.") |
| 106 | + return 0 |
| 107 | + except pyodbc.Error as e: |
| 108 | + print(f"Database error during role assignment: {e}", file=sys.stderr) |
| 109 | + return 1 |
| 110 | + except (RuntimeError, OSError) as e: |
| 111 | + print(f"Environment error during role assignment: {e}", file=sys.stderr) |
| 112 | + return 1 |
| 113 | + |
| 114 | + |
| 115 | +if __name__ == "__main__": |
| 116 | + sys.exit(main()) |
0 commit comments