SafeSQL-v1 (Playground)

Model Meta

Feedback: aakash.howlader@gmail.com
Model type: Language model
Language(s) (NLP): English
License: Apache 2.0
Playground: SafeSQL-v1-Demo

Overview

This is a Keras 3.x model trained specifically to detect malicious SQLs. It is able to detect various SQL injection vectors such as Error-based, Union-based, Blind, Boolean-based ,Time-based, Out-of-band, Stacked queries. This was trained on ~167K SQLs containing an almost even distribution of malicious and benign SQLs. Its training involved preprocessing specifically for SQL with special masking tokens. 28 additional numeric features were also generated and the top 10 among them were selected for training using Recursive Feature Elimination. The training consisted of a warm-up period with a smaller, sinusoidally decaying learning rate followed by a higher learning rate with cosine decay. A special callback was used to monitor for and protect against gradient explosions and automatically adjust the learning rate and model weights based on the scale of the explosion. Weight and kernel constraints are applied to help prevent overfitting and achieve better generalization. For faster model loading and inference, mixed precision has been used.

The best checkpoint has been saved and made available for use.

CONTEXT WINDOW: 1200 tokens
PARAMETERS: 30.7M (Trainable: 7.7M, Frozen: 2K, Optimizer: 23M)
NUMBER OF INPUTS: 2 - The SQL queries as string and extra numeric features.
NUMBER OF OUTPUTS: 1 - Probability that the given SQL is malicious (the output layer uses a sigmoid activation).

Checkpointed Epoch

823/823 ━━━━━━━━━━━━━━━━━━━━ 99s 120ms/step - AUPR: 0.9979 - f1_score: 0.5782 - fn: 64.0947 - fp: 8.2500 - loss: 0.0236 - precision: 0.9987 - recall: 0.9889 - val_AUPR: 0.9970 - val_f1_score: 0.5775 - val_fn: 34.0000 - val_fp: 4.0000 - val_loss: 0.0298 - val_precision: 0.9985 - val_recall: 0.9873 - learning_rate: 7.0911e-04

Benchmark Results

Total SQLs: 30919
Total Negatives: 11382
Total Positives: 19537
Total hits: 30844/30919 with accuracy of 99.76%.
False Negatives: 69 - 0.61%
False Positives: 6 - 0.03%

Training Data

The training data is made available here and the benchmark data is made available here. The data was curated from the following sources -

Benchmark Data

https://www.kaggle.com/datasets/sajid576/sql-injection-dataset?select=Modified_SQL_Dataset.csv

How to Use

Based on your hardware (whether using GPU or not), please download the corresponding requiremnts-[cpu/gpu].txt file and install it (pip install -r requirements.txt)
Download the model file sqid.keras.
The model expects certain numerical features along with the SQL query. As of v1, some boiler-plate code needs to be written in order to add the numeric features. Please use the below code snippet to load the model, add the expected numeric features and run an inference. Future iterations of the model will have the numeric features baked into the network's layers.

import re
from multiprocessing import cpu_count

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

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


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):
    s = ["num_tables", "num_columns", "num_literals", "num_parentheses", "has_union", "depth_nested_queries", "num_join", "num_sp_chars", "has_mismatched_quotes", "has_tautology"]
    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


input_sqls = ['SELECT roomName ,  RoomId FROM Rooms WHERE basePrice  >  160 AND maxOccupancy  >  2;', # Not malicious
              "ORDER BY 1,SLEEP(5),BENCHMARK(1000000,MD5('A')),4,5,6,7,8,9,10,11,12,13,14,15,16,17,18#", # Malicious
              "; desc users; --", # Malicious
              "ORDER BY 1,SLEEP(5),BENCHMARK(1000000,MD5('A')),4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27", # Malicious
              "SELECT DISTINCT t2.datasetid FROM paperdataset AS t3 JOIN dataset AS t2 ON t3.datasetid  =  t2.datasetid JOIN paperkeyphrase AS t1 ON t1.paperid  =  t3.paperid JOIN keyphrase AS t4 ON t1.keyphraseid  =  t4.keyphraseid WHERE t4.keyphrasename  =  ""semantic parsing"";" # Not malicious
              ]

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"]

input_df = pd.DataFrame(input_sqls, columns=['Query'])
input_df = add_features(input_df)

scaler = RobustScaler()
x_in = scaler.fit_transform(input_df[numeric_features])

preds = model.predict([input_df['Query'], x_in]).tolist()


for i, pred in enumerate(preds):
    print()
    print(f'Query: {input_sqls[i]}')
    print(f'Malicious? {pred[0] >= 0.50} ({pred[0]})')
    print()

# Run the benchmark

input_df = pd.read_csv('benchmark.csv')
hits = 0
data_size = input_df.shape[0]
miss_pos, miss_neg = [], []
total_negs = input_df[input_df['Label'] == 1.0].shape[0]
total_pos = input_df[input_df['Label'] == 0.0].shape[0]
pred_trans = ['Benign', 'Malicious']
false_metrics = {0: 0, 1: 0}
x_in = scaler.transform(input_df[numeric_features])
print('Running benchmark')
preds = model.predict([input_df['Query'], x_in])
miss_q = []

actuals = input_df['Label'].tolist()
for i, pred in enumerate(preds):
    pred = int(pred[0] > .95)
    if pred == actuals[i]:
        hits += 1
    else:
        false_metrics[int(pred)] += 1

print('Finished benchmark.')
print('printing results.')
acc = round((hits / data_size) * 100, 2)
f_neg = round((false_metrics[0] / total_negs) * 100, 2)
f_pos = round((false_metrics[1] / total_pos) * 100, 2)
print(f'Total data: {data_size}')
print(f'Total Negatives: {total_negs} \t Total Positives: {total_pos}')
print()
print(f'Total hits: {hits}/{data_size} with accuracy of {acc}%.')
print(f'False Negatives: {false_metrics[0]}({f_neg}%) \t False Positives: {false_metrics[1]}({f_pos}%)', false_metrics[0], f_neg, false_metrics[1], f_pos)

Output

2024-06-16 17:34:54.587073: I tensorflow/core/util/port.cc:113] oneDNN custom operations are on. You may see slightly different numerical results due to floating-point round-off errors from different computation orders. To turn them off, set the environment variable `TF_ENABLE_ONEDNN_OPTS=0`.
...
2024-06-16 17:36:11.762174: I external/local_xla/xla/stream_executor/cuda/cuda_dnn.cc:465] Loaded cuDNN version 8902
1/1 ━━━━━━━━━━━━━━━━━━━━ 14s 14s/step

Query: SELECT roomName ,  RoomId FROM Rooms WHERE basePrice  >  160 AND maxOccupancy  >  2;
Malicious? False (7.727547199465334e-05)


Query: ORDER BY 1,SLEEP(5),BENCHMARK(1000000,MD5('A')),4,5,6,7,8,9,10,11,12,13,14,15,16,17,18#
Malicious? True (1.0)


Query: ; desc users; --
Malicious? True (0.9999552965164185)


Query: ORDER BY 1,SLEEP(5),BENCHMARK(1000000,MD5('A')),4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27
Malicious? True (1.0)


Query: SELECT DISTINCT t2.datasetid FROM paperdataset AS t3 JOIN dataset AS t2 ON t3.datasetid  =  t2.datasetid JOIN paperkeyphrase AS t1 ON t1.paperid  =  t3.paperid JOIN keyphrase AS t4 ON t1.keyphraseid  =  t4.keyphraseid WHERE t4.keyphrasename  =  semantic parsing;
Malicious? False (6.156865989259686e-11)

Running benchmark
967/967 ━━━━━━━━━━━━━━━━━━━━ 37s 37ms/step
Finished benchmark.
printing results.
Total data: 30919
Total Negatives: 11382   Total Positives: 19537

Total hits: 30844/30919 with accuracy of 99.76%.
False Negatives: 69(0.61%)       False Positives: 6(0.03%)

deathsaber93
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SafeSQL-v1