diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml new file mode 100644 index 0000000..4046711 --- /dev/null +++ b/.github/workflows/release.yml @@ -0,0 +1,41 @@ +name: Release to PyPI +on: + release: + types: [published] + push: + tags: + - v*.*.* + +jobs: + build-and-publish: + runs-on: ubuntu-20.04 + steps: + - uses: actions/checkout@v2 + - name: Set up Python + uses: actions/setup-python@v2 + with: + python-version: 3.8 + - name: Install Poetry + uses: abatilo/actions-poetry@v2.0.0 + with: + poetry-version: 1.2 + - name: Verify versioning + run: | + [ "$(poetry version -s)" == "${GITHUB_REF#refs/tags/v}" ] + - name: Install dependencies + run: poetry install + - name: Run tests + run: poetry run pytest + - name: Build packages + run: poetry build + - name: Configure Poetry + run: | + poetry config repositories.testpypi https://test.pypi.org/legacy/ + poetry config pypi-token.testpypi ${{ secrets.TEST_PYPI_API_TOKEN }} + poetry config pypi-token.pypi "${{ secrets.PYPI_API_TOKEN }}" + - name: Publish to test PyPI + if: ${{ github.event_name == 'push' }} + run: poetry publish -r testpypi + - name: Publish to PyPI + if: ${{ github.event_name == 'release' }} + run: poetry publish \ No newline at end of file diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml new file mode 100644 index 0000000..689abf2 --- /dev/null +++ b/.github/workflows/test.yml @@ -0,0 +1,43 @@ +name: Test +on: + push: + branches: [ "*" ] + pull_request: + branches: [ "*" ] + workflow_dispatch: + +jobs: + test: + strategy: + matrix: + os: [ 'ubuntu-20.04' ] + python-version: [ '3.8', '3.9', '3.10' ] + poetry-version: [ '1.2' ] + runs-on: ${{ matrix.os }} + steps: + - uses: actions/checkout@v2 + - name: Set up Python + uses: actions/setup-python@v2 + with: + python-version: ${{ matrix.python-version }} + - name: Install Poetry + uses: abatilo/actions-poetry@v2.0.0 + with: + poetry-version: ${{ matrix.poetry-version }} + - name: Install dependencies + run: poetry install + - name: Run tests + run: poetry run pytest --cov=sigma --cov-report term --cov-report xml:cov.xml -vv + - name: Store coverage for badge + if: ${{ runner.os == 'Linux' }} + run: poetry run python print-coverage.py >> $GITHUB_ENV + - name: Create coverage badge + if: ${{ github.repository == 'wagga40/pySigma-backend-sqlite' && github.event_name == 'push' && runner.os == 'Linux' }} + uses: schneegans/dynamic-badges-action@v1.1.0 + with: + auth: ${{ secrets.GIST_SECRET }} + gistID: GitHub Gist identifier containing coverage badge JSON expected by shields.io. + filename: wagga40-pySigma-backend-sqlite.json + label: Coverage + message: ${{ env.COVERAGE }} + color: ${{ env.COVERAGE_COLOR }} diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..cbd7ce5 --- /dev/null +++ b/.gitignore @@ -0,0 +1,177 @@ +.coverage* +.vscode/ +**/__pycache__ +.pytest_cache/ +cov.xml +dist/ +docs/_build +.venv/ + +# General +.DS_Store +.AppleDouble +.LSOverride + +# Icon must end with two \r +Icon + +# Thumbnails +._* + +# Files that might appear in the root of a volume +.DocumentRevisions-V100 +.fseventsd +.Spotlight-V100 +.TemporaryItems +.Trashes +.VolumeIcon.icns +.com.apple.timemachine.donotpresent + +# Directories potentially created on remote AFP share +.AppleDB +.AppleDesktop +Network Trash Folder +Temporary Items +.apdisk + +# Byte-compiled / optimized / DLL files +__pycache__/ +*.py[cod] +*$py.class + +# C extensions +*.so + +# Distribution / packaging +.Python +build/ +develop-eggs/ +dist/ +downloads/ +eggs/ +.eggs/ +lib/ +lib64/ +parts/ +sdist/ +var/ +wheels/ +pip-wheel-metadata/ +share/python-wheels/ +*.egg-info/ +.installed.cfg +*.egg +MANIFEST + +# PyInstaller +# Usually these files are written by a python script from a template +# before PyInstaller builds the exe, so as to inject date/other infos into it. +*.manifest +*.spec + +# Installer logs +pip-log.txt +pip-delete-this-directory.txt + +# Unit test / coverage reports +htmlcov/ +.tox/ +.nox/ +.coverage +.coverage.* +.cache +nosetests.xml +coverage.xml +*.cover +*.py,cover +.hypothesis/ +.pytest_cache/ + +# Translations +*.mo +*.pot + +# Django stuff: +*.log +local_settings.py +db.sqlite3 +db.sqlite3-journal + +# Flask stuff: +instance/ +.webassets-cache + +# Scrapy stuff: +.scrapy + +# Sphinx documentation +docs/_build/ +docs/site +# PyBuilder +target/ + +# Jupyter Notebook +.ipynb_checkpoints + +# IPython +profile_default/ +ipython_config.py + +# pyenv +.python-version + +# pipenv +# According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control. +# However, in case of collaboration, if having platform-specific dependencies or dependencies +# having no cross-platform support, pipenv may install dependencies that don't work, or not +# install all needed dependencies. +#Pipfile.lock + +# PEP 582; used by e.g. github.com/David-OConnor/pyflow +__pypackages__/ + +# Celery stuff +celerybeat-schedule +celerybeat.pid + +# SageMath parsed files +*.sage.py + +# Environments +.env +.venv +env/ +/venv/ +ENV/ +env.bak/ +venv.bak/ + +# Spyder project settings +.spyderproject +.spyproject + +# Rope project settings +.ropeproject + +# mkdocs documentation +/site + +# mypy +.mypy_cache/ +.dmypy.json +dmypy.json + +# Pyre type checker +.pyre/ +.vscode/ +caches/ +.idea/ +__pypackages__ +.pdm.toml +.pdm-python +temp.py + +# Pyannotate generated stubs +type_info.json +.pdm-build/ +src/pdm/models/VERSION \ No newline at end of file diff --git a/LICENSE b/LICENSE index f288702..0adb16c 100644 --- a/LICENSE +++ b/LICENSE @@ -1,674 +1,166 @@ - GNU GENERAL PUBLIC LICENSE - Version 3, 29 June 2007 - - Copyright (C) 2007 Free Software Foundation, Inc. - Everyone is permitted to copy and distribute verbatim copies - of this license document, but changing it is not allowed. - - Preamble - - The GNU General Public License is a free, copyleft license for -software and other kinds of works. - - The licenses for most software and other practical works are designed -to take away your freedom to share and change the works. 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If the Library as you +received it does not specify a version number of the GNU Lesser +General Public License, you may choose any version of the GNU Lesser +General Public License ever published by the Free Software Foundation. + + If the Library as you received it specifies that a proxy can decide +whether future versions of the GNU Lesser General Public License shall +apply, that proxy's public statement of acceptance of any version is +permanent authorization for you to choose that version for the +Library. diff --git a/README.md b/README.md new file mode 100644 index 0000000..2a23b45 --- /dev/null +++ b/README.md @@ -0,0 +1,64 @@ +# pySigma SQLite Backend + +### **PLEASE NOTE THAT THIS IS A WORK IN PROGRESS** + +This is the SQLite backend for pySigma. It provides the package `sigma.backends.sqlite` with the `sqliteBackend` class. +Further, it contains the following processing pipelines in `sigma.pipelines.sqlite` **(which is empty for now)** + +For now, this backend aims to be compatible with [Zircolite](https://github.com/wagga40/Zircolite) which uses pure SQLite queries to perform SIGMA-based detection on EVTX, Auditd, Sysmon for linux, XML or JSONL/NDJSON Logs. + +It supports the following output formats: + +* default: plain SQLite queries +* zircolite : SQLite queries in JSON format for Zircolite + +This backend is currently maintained by: + +* [wagga](https://github.com/wagga40/) + +# Quick Start + +## Example script (default output) with sysmon pipeline + +```python +from sigma.collection import SigmaCollection +from sigma.backends.sqlite import sqlite +from sigma.pipelines.sysmon import sysmon_pipeline +from sigma.pipelines.windows import windows_logsource_pipeline + +from sigma.processing.resolver import ProcessingPipelineResolver + +# Create the pipeline resolver +piperesolver = ProcessingPipelineResolver() +# Add pipelines +piperesolver.add_pipeline_class(sysmon_pipeline()) # Sysmon +piperesolver.add_pipeline_class(windows_logsource_pipeline()) # Windows +# Create a combined pipeline +combined_pipeline = piperesolver.resolve(piperesolver.pipelines) +# Instantiate backend using the combined pipeline +sqlite_backend = sqlite.sqliteBackend(combined_pipeline) +# Change to sqlite_backend.convert_rule(rule, "zircolite")[0] tu use "zircolite" format + +rule = SigmaCollection.from_yaml( +r""" + title: Test + status: test + logsource: + category: test_category + product: test_product + detection: + sel: + fieldA: valueA + fieldB: valueB + condition: sel +""") + +print(sqlite_backend.convert(rule)[0]) +``` + +## Running + +```shell +poetry poetry run python3 example.py + +``` \ No newline at end of file diff --git a/poetry.lock b/poetry.lock new file mode 100644 index 0000000..900620e --- /dev/null +++ b/poetry.lock @@ -0,0 +1,438 @@ +# This file is automatically @generated by Poetry 1.5.1 and should not be changed by hand. + +[[package]] +name = "certifi" +version = "2023.7.22" +description = "Python package for providing Mozilla's CA Bundle." +optional = false +python-versions = ">=3.6" +files = [ + {file = "certifi-2023.7.22-py3-none-any.whl", hash = "sha256:92d6037539857d8206b8f6ae472e8b77db8058fec5937a1ef3f54304089edbb9"}, + {file = "certifi-2023.7.22.tar.gz", hash = "sha256:539cc1d13202e33ca466e88b2807e29f4c13049d6d87031a3c110744495cb082"}, +] + +[[package]] +name = "charset-normalizer" +version = "3.2.0" +description = "The Real First Universal Charset Detector. 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"e79828503be1e39236d05318fa6ff312a4ddd379bf58f57f99397fb24f8ef045" diff --git a/print-coverage.py b/print-coverage.py new file mode 100644 index 0000000..65667a0 --- /dev/null +++ b/print-coverage.py @@ -0,0 +1,15 @@ +# Prints code testing coverage as percentage for badge generation. +import xml.etree.ElementTree as et + +tree = et.parse("cov.xml") +root = tree.getroot() +coverage = float(root.attrib["line-rate"]) * 100 +print(f"COVERAGE={coverage:3.4}%") +if coverage >= 95.0: + print("COVERAGE_COLOR=green") +elif coverage >= 90.0: + print("COVERAGE_COLOR=yellow") +elif coverage >= 85.0: + print("COVERAGE_COLOR=orange") +else: + print("COVERAGE_COLOR=red") \ No newline at end of file diff --git a/pyproject.toml b/pyproject.toml new file mode 100644 index 0000000..e4f12d8 --- /dev/null +++ b/pyproject.toml @@ -0,0 +1,53 @@ +[tool.poetry] +name = "pySigma-backend-sqlite" +version = "0.1.0" +description = "pySigma sqlite backend" +authors = ["wagga "] +license = "LGPL-3.0-only" +repository = "https://github.com/wagga40/pySigma-backend-sqlite" +packages = [ + { include = "sigma" } +] + +[tool.poetry.dependencies] +python = "^3.8" +pysigma = "^0.9.0" +pysigma-pipeline-sysmon = "^1.0.2" +pysigma-pipeline-windows = "^1.1.0" + +[tool.poetry.group.dev.dependencies] +pytest = "^7.4.0" +pytest-cov = "^4.1.0" +coverage = "^7.3.0" + + +[tool.pdm] +[tool.pdm.dev-dependencies] +dev = [] + +[tool.pdm.build] +includes = ["sigma"] +[build-system] +requires = ["poetry-core>=1.0.0"] +build-backend = "poetry.core.masonry.api" + +[project] +authors = [ + {name = "wagga", email = "wagga"}, +] +license = {text = "LGPL-3.0-only"} +requires-python = ">=3.8,<4.0" +dependencies = [ + "pysigma>=0.10.2", +] +name = "pySigma-backend-sqlite" +version = "0.1.0" +description = "pySigma sqlite backend" + +[project.urls] +repository = "https://github.com/wagga40/pySigma-backend-sqlite" + +[project.group.dev.dependencies] +pytest = "^7.4.0" +pytest-cov = "^4.1.0" +coverage = "^7.3.0" diff --git a/sigma/backends/sqlite/__init__.py b/sigma/backends/sqlite/__init__.py new file mode 100644 index 0000000..55c619f --- /dev/null +++ b/sigma/backends/sqlite/__init__.py @@ -0,0 +1,5 @@ +from .sqlite import sqliteBackend + +backends = { # Mapping between backend identifiers and classes. This is used by the pySigma plugin system to recognize backends and expose them with the identifier. + "sqlite": sqliteBackend, +} \ No newline at end of file diff --git a/sigma/backends/sqlite/sqlite.py b/sigma/backends/sqlite/sqlite.py new file mode 100644 index 0000000..5302cb5 --- /dev/null +++ b/sigma/backends/sqlite/sqlite.py @@ -0,0 +1,243 @@ +from sigma.conversion.deferred import DeferredQueryExpression +from sigma.conversion.state import ConversionState +from sigma.exceptions import SigmaFeatureNotSupportedByBackendError, SigmaValueError +from sigma.rule import SigmaRule +from sigma.conversion.base import TextQueryBackend +from sigma.conditions import ConditionItem, ConditionAND, ConditionOR, ConditionNOT, ConditionValueExpression, ConditionFieldEqualsValueExpression +from sigma.types import SigmaCompareExpression, SigmaString, SpecialChars, SigmaRegularExpressionFlag + +import re +import json +from typing import ClassVar, Dict, List, Optional, Pattern, Tuple, Union, Any + +class sqliteBackend(TextQueryBackend): + """SQLite backend.""" + + # Operator precedence: tuple of Condition{AND,OR,NOT} in order of precedence. + # The backend generates grouping if required + name : ClassVar[str] = "SQLite backend" + formats : Dict[str, str] = { + "default": "Plain SQLite queries", + "zircolite": "Zircolite JSON format", + } + requires_pipeline : bool = False # TODO: does the backend requires that a processing pipeline is provided? This information can be used by user interface programs like Sigma CLI to warn users about inappropriate usage of the backend. + + precedence : ClassVar[Tuple[ConditionItem, ConditionItem, ConditionItem]] = (ConditionNOT, ConditionAND, ConditionOR) + parenthesize : bool = True + group_expression : ClassVar[str] = "({expr})" # Expression for precedence override grouping as format string with {expr} placeholder + + # Generated query tokens + token_separator : str = " " # separator inserted between all boolean operators + or_token : ClassVar[str] = "OR" + and_token : ClassVar[str] = "AND" + not_token : ClassVar[str] = "NOT" + eq_token : ClassVar[str] = "=" # Token inserted between field and value (without separator) + + # String output + ## Fields + ### Quoting + + # SQLite correct way to handle field name is detailed here : https://sqlite.org/lang_keywords.html. + # Double-quoting should be the way to go. But since in some case quotes are interpreted as literals we need to find an alternative. + # Obviously, we cannot use "[" and "]", because it is 2 different characters, so we are left with "`" (MySQL). + field_quote : ClassVar[str] = "`" # Character used to quote field characters if field_quote_pattern matches (or not, depending on field_quote_pattern_negation). No field name quoting is done if not set. + field_quote_pattern : ClassVar[Pattern] = re.compile("^[a-zA-Z0-9_]*$") # Quote field names if this pattern (doesn't) matches, depending on field_quote_pattern_negation. Field name is always quoted if pattern is not set. + field_quote_pattern_negation : ClassVar[bool] = True # Negate field_quote_pattern result. Field name is quoted if pattern doesn't matches if set to True (default). + + ### Escaping + #field_escape : ClassVar[str] = "\\" # Character to escape particular parts defined in field_escape_pattern. + #field_escape_quote : ClassVar[bool] = True # Escape quote string defined in field_quote + #field_escape_pattern : ClassVar[Pattern] = re.compile("\\s") # All matches of this pattern are prepended with the string contained in field_escape. + + ## Values + str_quote : ClassVar[str] = "'" # string quoting character (added as escaping character) + #str_quote_pattern: ClassVar[Pattern] = re.compile(r"^.*%{1,}.*|.*_{1,}.*$") + #str_quote_pattern_negation: ClassVar[bool] = True + + escape_char : ClassVar[str] = "\\" # Escaping character for special characters inside string + wildcard_multi : ClassVar[str] = "%" # Character used as multi-character wildcard + wildcard_single : ClassVar[str] = "_" # Character used as single-character wildcard + add_escaped : ClassVar[str] = "\"" # Characters quoted in addition to wildcards and string quote + #filter_chars : ClassVar[str] = "" # Characters filtered + bool_values : ClassVar[Dict[bool, str]] = { # Values to which boolean values are mapped. + True: "true", + False: "false", + } + + # String matching operators. if none is appropriate eq_token is used. + startswith_expression : ClassVar[str] = "{field} LIKE '{value}%'" + endswith_expression : ClassVar[str] = "{field} LIKE '%{value}'" + contains_expression : ClassVar[str] = "{field} LIKE '%{value}%'" + wildcard_match_expression : ClassVar[str] = "{field} LIKE '%{value}%'" # Special expression if wildcards can't be matched with the eq_token operator + + # Special expression if wildcards can't be matched with the eq_token operator + wildcard_match_str_expression: ClassVar[str] = "{field} LIKE '%{value}%'" + #wildcard_match_num_expression: ClassVar[str] = "{field} LIKE '%{value}%'" + + # Regular expressions + # Regular expression query as format string with placeholders {field}, {regex}, {flag_x} where x + # is one of the flags shortcuts supported by Sigma (currently i, m and s) and refers to the + # token stored in the class variable re_flags. + re_expression : ClassVar[str] = "{field} REGEXP '{regex}'" + re_escape_char : ClassVar[str] = r""" \ """ # Character used for escaping in regular expressions + re_escape : ClassVar[Tuple[str]] = () # List of strings that are escaped + re_escape_escape_char : bool = True # If True, the escape character is also escaped + re_flag_prefix : bool = True # If True, the flags are prepended as (?x) group at the beginning of the regular expression, e.g. (?i). If this is not supported by the target, it should be set to False. + + # Mapping from SigmaRegularExpressionFlag values to static string templates that are used in + # flag_x placeholders in re_expression template. + # By default, i, m and s are defined. If a flag is not supported by the target query language, + # remove it from re_flags or don't define it to ensure proper error handling in case of appearance. + # re_flags : Dict[SigmaRegularExpressionFlag, str] = {} + + # Numeric comparison operators + compare_op_expression : ClassVar[str] = "{field} {operator} {value}" # Compare operation query as format string with placeholders {field}, {operator} and {value} + # Mapping between CompareOperators elements and strings used as replacement for {operator} in compare_op_expression + compare_operators : ClassVar[Dict[SigmaCompareExpression.CompareOperators, str]] = { + SigmaCompareExpression.CompareOperators.LT : "<", + SigmaCompareExpression.CompareOperators.LTE : "<=", + SigmaCompareExpression.CompareOperators.GT : ">", + SigmaCompareExpression.CompareOperators.GTE : ">=", + } + + # Expression for comparing two event fields + field_equals_field_expression : ClassVar[Optional[str]] = None # Field comparison expression with the placeholders {field1} and {field2} corresponding to left field and right value side of Sigma detection item + field_equals_field_escaping_quoting : Tuple[bool, bool] = (True, True) # If regular field-escaping/quoting is applied to field1 and field2. A custom escaping/quoting can be implemented in the convert_condition_field_eq_field_escape_and_quote method. + + # Null/None expressions + field_null_expression : ClassVar[str] = "{field} IS NULL" # Expression for field has null value as format string with {field} placeholder for field name + + # Field existence condition expressions. + #field_exists_expression : ClassVar[str] = "exists({field})" # Expression for field existence as format string with {field} placeholder for field name + #field_not_exists_expression : ClassVar[str] = "notexists({field})" # Expression for field non-existence as format string with {field} placeholder for field name. If not set, field_exists_expression is negated with boolean NOT. + + # Field value in list, e.g. "field in (value list)" or "field containsall (value list)" + convert_or_as_in : ClassVar[bool] = False # Convert OR as in-expression + convert_and_as_in : ClassVar[bool] = False # Convert AND as in-expression + in_expressions_allow_wildcards : ClassVar[bool] = False # Values in list can contain wildcards. If set to False (default) only plain values are converted into in-expressions. + field_in_list_expression : ClassVar[str] = "{field} {op} ({list})" # Expression for field in list of values as format string with placeholders {field}, {op} and {list} + or_in_operator : ClassVar[str] = "IN" # Operator used to convert OR into in-expressions. Must be set if convert_or_as_in is set + #and_in_operator : ClassVar[str] = "contains-all" # Operator used to convert AND into in-expressions. Must be set if convert_and_as_in is set + list_separator : ClassVar[str] = ", " # List element separator + + # Value not bound to a field + + # TODO : SQlite only handles FTS ("MATCH") with virtual tables. Not Handled for now. + #unbound_value_str_expression : ClassVar[str] = "MATCH {value}" # Expression for string value not bound to a field as format string with placeholder {value} + #unbound_value_num_expression : ClassVar[str] = 'MATCH {value}' # Expression for number value not bound to a field as format string with placeholder {value} + + # Query finalization: appending and concatenating deferred query part + deferred_start : ClassVar[str] = "" # String used as separator between main query and deferred parts + deferred_separator : ClassVar[str] = "" # String used to join multiple deferred query parts + deferred_only_query : ClassVar[str] = "" # String used as query if final query only contains deferred expression + + table = '' + + def convert_value_str(self, s: SigmaString, state: ConversionState, no_quote: bool=False) -> str: + """Convert a SigmaString into a plain string which can be used in query.""" + converted = s.convert( + self.escape_char, + self.wildcard_multi, + self.wildcard_single, + self.str_quote + self.add_escaped, + self.filter_chars, + ) + if self.decide_string_quoting(s) and not no_quote: + return self.quote_string(converted) + else: + return converted + + def convert_condition_field_eq_val_str( + self, cond: ConditionFieldEqualsValueExpression, state: ConversionState + ) -> Union[str, DeferredQueryExpression]: + """Conversion of field = string value expressions""" + try: + remove_quote = True # Expressions that use "LIKE" (starswith, endswith, ...) don't need supplemental quotes + + if ( # Check conditions for usage of 'startswith' operator + self.startswith_expression is not None # 'startswith' operator is defined in backend + and cond.value.endswith(SpecialChars.WILDCARD_MULTI) # String ends with wildcard + and not cond.value[:-1].contains_special() # Remainder of string doesn't contains special characters + ): + expr = (self.startswith_expression) # If all conditions are fulfilled, use 'startswith' operartor instead of equal token + value = cond.value[:-1] + elif ( # Same as above but for 'endswith' operator: string starts with wildcard and doesn't contains further special characters + self.endswith_expression is not None + and cond.value.startswith(SpecialChars.WILDCARD_MULTI) + and not cond.value[1:].contains_special() + ): + expr = self.endswith_expression + value = cond.value[1:] + elif ( # contains: string starts and ends with wildcard + self.contains_expression is not None + and cond.value.startswith(SpecialChars.WILDCARD_MULTI) + and cond.value.endswith(SpecialChars.WILDCARD_MULTI) + and not cond.value[1:-1].contains_special() + ): + expr = self.contains_expression + value = cond.value[1:-1] + elif ( # wildcard match expression: string contains wildcard + self.wildcard_match_expression is not None and cond.value.contains_special() + ): + expr = self.wildcard_match_expression + value = cond.value + else: + expr = "{field}" + self.eq_token + "{value}" + value = cond.value + remove_quote = False + + if remove_quote: + return expr.format( + field=self.escape_and_quote_field(cond.field), + value=self.convert_value_str(value, state, remove_quote), + ) + else: + return expr.format( + field=self.escape_and_quote_field(cond.field), + value=self.convert_value_str(value, state), + ) + except TypeError: # pragma: no cover + raise NotImplementedError( + "Field equals string value expressions with strings are not supported by the backend." + ) + + def finalize_query_default(self, rule: SigmaRule, query: str, index: int, state: ConversionState) -> Any: + + # TODO : fields support will be handled with a backend option (all fields by default) + #fields = "*" if len(rule.fields) == 0 else f"*, {', '.join(rule.fields)}" + + # TODO : table name will be handled with a backend option + sqlite_query = f'SELECT * FROM {self.table} WHERE {query}' + + return sqlite_query + + + def finalize_query_zircolite(self, rule: SigmaRule, query: str, index: int, state: ConversionState) -> Any: + + sqlite_query = f'SELECT * FROM logs WHERE {query}' + + rule_as_dict = rule.to_dict() + + zircolite_rule = { + "title": rule_as_dict["title"], + "id": rule_as_dict["id"] if "id" in rule_as_dict else "", + "status": rule_as_dict["status"] if "status" in rule_as_dict else "", + "description": rule_as_dict["description"] if "description" in rule_as_dict else "", + "author": rule_as_dict["author"] if "author" in rule_as_dict else "", + "tags": rule_as_dict["tags"] if "tags" in rule_as_dict else [], + "falsepositives": rule_as_dict["falsepositives"] if "falsepositives" in rule_as_dict else [], + "level": rule_as_dict["level"] if "level" in rule_as_dict else "", + "rule": [sqlite_query], + "filename": "" + } + + return json.dumps(zircolite_rule) + + # TODO : SQlite only handles FTS ("MATCH") with virtual tables. Not Handled for now. + def convert_condition_val_str(self, cond : ConditionValueExpression, state : ConversionState) -> Union[str, DeferredQueryExpression]: + """Conversion of value-only strings.""" + raise NotImplementedError("Value-only string expressions (i.e Full Text Search or 'keywords' search) are not supported by the backend.") + + def convert_condition_val_num(self, cond : ConditionValueExpression, state : ConversionState) -> Union[str, DeferredQueryExpression]: + """Conversion of value-only numbers.""" + raise NotImplementedError("Value-only number expressions (i.e Full Text Search or 'keywords' search) are not supported by the backend.") \ No newline at end of file diff --git a/tests/test_backend_sqlite.py b/tests/test_backend_sqlite.py new file mode 100644 index 0000000..16ae23c --- /dev/null +++ b/tests/test_backend_sqlite.py @@ -0,0 +1,149 @@ +import pytest +from sigma.collection import SigmaCollection +from sigma.backends.sqlite import sqliteBackend + +@pytest.fixture +def sqlite_backend(): + return sqliteBackend() + +# TODO: implement tests for some basic queries and their expected results. +def test_sqlite_and_expression(sqlite_backend : sqliteBackend): + assert sqlite_backend.convert( + SigmaCollection.from_yaml(""" + title: Test + status: test + logsource: + category: test_category + product: test_product + detection: + sel: + fieldA: valueA + fieldB: valueB + condition: sel + """) + ) == ["SELECT * FROM WHERE fieldA='valueA' AND fieldB='valueB'"] + +def test_sqlite_or_expression(sqlite_backend : sqliteBackend): + assert sqlite_backend.convert( + SigmaCollection.from_yaml(""" + title: Test + status: test + logsource: + category: test_category + product: test_product + detection: + sel1: + fieldA: valueA + sel2: + fieldB: valueB + condition: 1 of sel* + """) + ) == ["SELECT * FROM WHERE fieldA='valueA' OR fieldB='valueB'"] + +def test_sqlite_and_or_expression(sqlite_backend : sqliteBackend): + assert sqlite_backend.convert( + SigmaCollection.from_yaml(""" + title: Test + status: test + logsource: + category: test_category + product: test_product + detection: + sel: + fieldA: + - valueA1 + - valueA2 + fieldB: + - valueB1 + - valueB2 + condition: sel + """) + ) == ["SELECT * FROM WHERE (fieldA='valueA1' OR fieldA='valueA2') AND (fieldB='valueB1' OR fieldB='valueB2')"] + +def test_sqlite_or_and_expression(sqlite_backend : sqliteBackend): + assert sqlite_backend.convert( + SigmaCollection.from_yaml(""" + title: Test + status: test + logsource: + category: test_category + product: test_product + detection: + sel1: + fieldA: valueA1 + fieldB: valueB1 + sel2: + fieldA: valueA2 + fieldB: valueB2 + condition: 1 of sel* + """) + ) == ["SELECT * FROM WHERE (fieldA='valueA1' AND fieldB='valueB1') OR (fieldA='valueA2' AND fieldB='valueB2')"] + +def test_sqlite_in_expression(sqlite_backend : sqliteBackend): + assert sqlite_backend.convert( + SigmaCollection.from_yaml(""" + title: Test + status: test + logsource: + category: test_category + product: test_product + detection: + sel: + fieldA: + - valueA + - valueB + - valueC* + condition: sel + """) + ) == ["SELECT * FROM WHERE fieldA='valueA' OR fieldA='valueB' OR fieldA LIKE 'valueC%'"] + +def test_sqlite_regex_query(sqlite_backend : sqliteBackend): + assert sqlite_backend.convert( + SigmaCollection.from_yaml(""" + title: Test + status: test + logsource: + category: test_category + product: test_product + detection: + sel: + fieldA|re: foo.*bar + fieldB: foo + condition: sel + """) + ) == ["SELECT * FROM WHERE fieldA REGEXP 'foo.*bar' AND fieldB='foo'"] + +def test_sqlite_cidr_query(sqlite_backend : sqliteBackend): + assert sqlite_backend.convert( + SigmaCollection.from_yaml(""" + title: Test + status: test + logsource: + category: test_category + product: test_product + detection: + sel: + field|cidr: 192.168.0.0/16 + condition: sel + """) + ) == ["SELECT * FROM WHERE field='192.168.\%'"] + +def test_sqlite_field_name_with_whitespace(sqlite_backend : sqliteBackend): + assert sqlite_backend.convert( + SigmaCollection.from_yaml(""" + title: Test + status: test + logsource: + category: test_category + product: test_product + detection: + sel: + field name: value + condition: sel + """) + ) == ["SELECT * FROM WHERE `field name`='value'"] + +# TODO: implement tests for all backend features that don't belong to the base class defaults, e.g. features that were +# implemented with custom code, deferred expressions etc. + +