app.py

import re
from multiprocessing import cpu_count

from keras.src.saving import load_model
import pandas as pd
from keras.src.utils import set_random_seed
from numpy import int64
from pandarallel import pandarallel
from sklearn.preprocessing import RobustScaler
import gradio as gr


set_random_seed(65536)

pandarallel.initialize(use_memory_fs=False, nb_workers=cpu_count())
model = load_model('./sqid.keras')


def sql_tokenize(sql_query):
    sql_query = sql_query.replace('`', ' ').replace('%20', ' ').replace('=', ' = ').replace('((', ' (( ').replace(
        '))', ' )) ').replace('(', ' ( ').replace(')', ' ) ').replace('||', ' || ').replace(',', '').replace(
        '--', ' -- ').replace(':', ' : ').replace('%23', ' # ').replace('+', ' + ').replace('!=',
                                                                                            ' != ') \
        .replace('"', ' " ').replace('%26', ' and ').replace('$', ' $ ').replace('%28', ' ( ').replace('%2A', ' * ') \
        .replace('%7C', ' | ').replace('&', ' & ').replace(']', ' ] ').replace('[', ' [ ').replace(';',
                                                                                                   ' ; ').replace(
        '/*', ' /* ')
    sql_reserved = {'SELECT', 'FROM', 'WHERE', 'AND', 'OR', 'NOT', 'IN', 'LIKE', 'ORDER', 'BY', 'GROUP', 'HAVING',
                    'LIMIT', 'BETWEEN', 'IS', 'NULL', '%', 'LIKE', 'MIN', 'MAX', 'AS', 'UPPER', 'LOWER', 'TO_DATE',
                    '=', '>', '<', '>=', '<=', '!=', '<>', 'BETWEEN', 'LIKE', 'EXISTS', 'JOIN', 'UNION', 'ALL',
                    'ASC', 'DESC', '||', 'AVG', 'LIMIT', 'EXCEPT', 'INTERSECT', 'CASE', 'WHEN', 'THEN', 'IF',
                    'IF', 'ANY', 'CAST', 'CONVERT', 'COALESCE', 'NULLIF', 'INNER', 'OUTER', 'LEFT', 'RIGHT', 'FULL',
                    'CROSS', 'OVER', 'PARTITION', 'SUM', 'COUNT', 'WITH', 'INTERVAL', 'WINDOW', 'OVER',
                    'ROW_NUMBER', 'RANK',
                    'DENSE_RANK', 'NTILE', 'FIRST_VALUE', 'LAST_VALUE', 'LAG', 'LEAD', 'DISTINCT', 'COMMENT',
                    'INSERT',
                    'UPDATE', 'DELETED', 'MERGE', '*', 'generate_series', 'char', 'chr', 'substr', 'lpad',
                    'extract',
                    'year', 'month', 'day', 'timestamp', 'number', 'string', 'concat', 'INFORMATION_SCHEMA',
                    "SQLITE_MASTER", 'TABLES', 'COLUMNS', 'CUBE', 'ROLLUP', 'RECURSIVE', 'FILTER', 'EXCLUDE',
                    'AUTOINCREMENT', 'WITHOUT', 'ROWID', 'VIRTUAL', 'INDEXED', 'UNINDEXED', 'SERIAL',
                    'DO', 'RETURNING', 'ILIKE', 'ARRAY', 'ANYARRAY', 'JSONB', 'TSQUERY', 'SEQUENCE',
                    'SYNONYM', 'CONNECT', 'START', 'LEVEL', 'ROWNUM', 'NOCOPY', 'MINUS', 'AUTO_INCREMENT', 'BINARY',
                    'ENUM', 'REPLACE', 'SET', 'SHOW', 'DESCRIBE', 'USE', 'EXPLAIN', 'STORED', 'VIRTUAL', 'RLIKE',
                    'MD5', 'SLEEP', 'BENCHMARK', '@@VERSION', 'VERSION', '@VERSION', 'CONVERT', 'NVARCHAR', '#',
                    '##', 'INJECTX',
                    'DELAY', 'WAITFOR', 'RAND',
                    }

    tokens = sql_query.split()
    tokens = [re.sub(r"""[^*\w\s.=\-><_|()!"']""", '', token) for token in tokens]
    for i, token in enumerate(tokens):
        if token.strip().upper() in sql_reserved:
            continue
        if token.strip().isnumeric():
            tokens[i] = '#NUMBER#'
        elif re.match(r'^[a-zA-Z_.|][a-zA-Z0-9_.|]*$', token.strip()):
            tokens[i] = '#IDENTIFIER#'
        elif re.match(r'^[\d:]*$', token.strip()):
            tokens[i] = '#TIMESTAMP#'
        elif '%' in token.strip():
            tokens[i] = ' '.join(
                [j.strip() if j.strip() in ('%', "'", "'") else '#IDENTIFIER#' for j in token.strip().split('%')])
    return ' '.join(tokens)


def add_features(x):
    x['Query'] = x['Query'].copy().parallel_apply(lambda a: sql_tokenize(a))
    x['num_tables'] = x['Query'].str.lower().str.count(r'FROM\s+#IDENTIFIER#', flags=re.I)
    x['num_columns'] = x['Query'].str.lower().str.count(r'SELECT\s+#IDENTIFIER#', flags=re.I)
    x['num_literals'] = x['Query'].str.lower().str.count("'[^']*'", flags=re.I) + x['Query'].str.lower().str.count(
        '"[^"]"', flags=re.I)
    x['num_parentheses'] = x['Query'].str.lower().str.count("\\(", flags=re.I) + x['Query'].str.lower().str.count(
        '\\)',
        flags=re.I)
    x['has_union'] = x['Query'].str.lower().str.count(" union |union all", flags=re.I) > 0
    x['has_union'] = x['has_union'].astype(int64)
    x['depth_nested_queries'] = x['Query'].str.lower().str.count("\\(", flags=re.I)
    x['num_join'] = x['Query'].str.lower().str.count(
        " join |inner join|outer join|full outer join|full inner join|cross join|left join|right join",
        flags=re.I)
    x['num_sp_chars'] = x['Query'].parallel_apply(lambda a: len(re.findall(r'[\'";\-*/%=><|#]', a)))
    x['has_mismatched_quotes'] = x['Query'].parallel_apply(
        lambda sql_query: 1 if re.search(r"'.*[^']$|\".*[^\"]$", sql_query) else 0)
    x['has_tautology'] = x['Query'].parallel_apply(lambda sql_query: 1 if re.search(r"'[\s]*=[\s]*'", sql_query) else 0)
    return x


def is_malicious_sql(sql, threshold):
    input_df = pd.DataFrame([sql], columns=['Query'])
    input_df = add_features(input_df)
    numeric_features = ["num_tables", "num_columns", "num_literals", "num_parentheses", "has_union",
                        "depth_nested_queries", "num_join", "num_sp_chars", "has_mismatched_quotes", "has_tautology"]
    scaler = RobustScaler()
    x_in = scaler.fit_transform(input_df[numeric_features])

    preds = model.predict([input_df['Query'], x_in]).tolist()[0][0]
    if preds > float(threshold):
        return 'Malicious'
    return 'Safe'


def respond(
    message,
    history,
        threshold
):
    if len(history) > 5:
        history = history[1:]
    for val in history:
        if val[0].lower().strip() == message.lower().strip():
            return val[1]

    val = (message.lower().strip(), is_malicious_sql(message, threshold))
    print(val)
    return val[1]



"""
For information on how to customize the ChatInterface, peruse the gradio docs: https://www.gradio.app/docs/chatinterface
"""
demo = gr.ChatInterface(
    respond,
    additional_inputs=[
        gr.Slider(minimum=0.01, maximum=0.99, value=0.75, step=0.01, label="Detection Probability Threshold "),
    ],
)


if __name__ == "__main__":
    demo.launch()