GitHub - ajinabraham/libsast: Generic SAST Library (original) (raw)

libsast

Generic SAST for Security Engineers. Powered by regex based pattern matcher and semantic aware semgrep.

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Install

pip install semgrep==1.86.0 #For semgrep support pip install libsast

Pattern Matcher is cross-platform, but Semgrep supports only Mac and Linux.

Command Line Options

$ libsast usage: libsast [-h] [-o OUTPUT] [-p PATTERN_FILE] [-s SGREP_PATTERN_FILE] [--sgrep-file-extensions SGREP_FILE_EXTENSIONS [SGREP_FILE_EXTENSIONS ...]] [--file-extensions FILE_EXTENSIONS [FILE_EXTENSIONS ...]] [--ignore-filenames IGNORE_FILENAMES [IGNORE_FILENAMES ...]] [--ignore-extensions IGNORE_EXTENSIONS [IGNORE_EXTENSIONS ...]] [--ignore-paths IGNORE_PATHS [IGNORE_PATHS ...]] [--show-progress] [--cpu-core CPU_CORE] [-v] [path ...]

positional arguments: path Path can be file(s) or directories

options: -h, --help show this help message and exit -o OUTPUT, --output OUTPUT Output filename to save JSON report. -p PATTERN_FILE, --pattern-file PATTERN_FILE YAML pattern file, directory or url -s SGREP_PATTERN_FILE, --sgrep-pattern-file SGREP_PATTERN_FILE sgrep rules directory --sgrep-file-extensions SGREP_FILE_EXTENSIONS [SGREP_FILE_EXTENSIONS ...] File extensions that should be scanned with semantic grep --file-extensions FILE_EXTENSIONS [FILE_EXTENSIONS ...] File extensions that should be scanned with pattern matcher --ignore-filenames IGNORE_FILENAMES [IGNORE_FILENAMES ...] File name(s) to ignore --ignore-extensions IGNORE_EXTENSIONS [IGNORE_EXTENSIONS ...] File extension(s) to ignore in lower case --ignore-paths IGNORE_PATHS [IGNORE_PATHS ...] Path(s) to ignore --show-progress Show scan progress --cpu-core CPU_CORE No of CPU cores to use. Use all cores by default -v, --version Show libsast version

Example Usage

$ libsast -s tests/assets/rules/semantic_grep/ -p tests/assets/rules/pattern_matcher/ tests/assets/files/ { "pattern_matcher": { "test_regex": { "files": [ { "file_path": "tests/assets/files/test_matcher.test", "match_lines": [ 28, 28 ], "match_position": [ 1141, 1149 ], "match_string": ".close()" } ], "metadata": {} }, "test_regex_and": { "files": [ { "file_path": "tests/assets/files/test_matcher.test", "match_lines": [ 3, 3 ], "match_position": [ 52, 66 ], "match_string": "webkit.WebView" }, { "file_path": "tests/assets/files/test_matcher.test", "match_lines": [ 7, 7 ], "match_position": [ 194, 254 ], "match_string": ".loadUrl("file:/" + Environment.getExternalStorageDirectory(" } ], "metadata": {} }, "test_regex_and_not": { "files": [ { "file_path": "tests/assets/files/test_matcher.test", "match_lines": [ 42, 42 ], "match_position": [ 1415, 1424 ], "match_string": "WKWebView" }, { "file_path": "tests/assets/files/test_matcher.test", "match_lines": [ 40, 40 ], "match_position": [ 1363, 1372 ], "match_string": "WKWebView" } ], "metadata": {} }, "test_regex_and_or": { "files": [ { "file_path": "tests/assets/files/test_matcher.test", "match_lines": [ 50, 50 ], "match_position": [ 1551, 1571 ], "match_string": "telephony.SmsManager" }, { "file_path": "tests/assets/files/test_matcher.test", "match_lines": [ 58, 58 ], "match_position": [ 1973, 1988 ], "match_string": "sendTextMessage" } ], "metadata": {} }, "test_regex_multiline_and_metadata": { "files": [ { "file_path": "tests/assets/files/test_matcher.test", "match_lines": [ 52, 52 ], "match_position": [ 1586, 1684 ], "match_string": "public void onRequestPermissionsResult(int requestCode,String permissions[], int[] grantResults) {" }, { "file_path": "tests/assets/files/test_matcher.test", "match_lines": [ 10, 11 ], "match_position": [ 297, 368 ], "match_string": "public static ForgeAccount add(Context context, ForgeAccount account) {" } ], "metadata": { "cwe": "CWE-1051 Initialization with Hard-Coded Network Resource Configuration Data", "description": "This is a rule to test regex", "foo": "bar", "masvs": "MSTG-STORAGE-3", "owasp-mobile": "M1: Improper Platform Usage", "owasp-web": "A10: Insufficient Logging & Monitoring", "severity": "info" } }, "test_regex_or": { "files": [ { "file_path": "tests/assets/files/test_matcher.test", "match_lines": [ 26, 26 ], "match_position": [ 1040, 1067 ], "match_string": "Context.MODE_WORLD_READABLE" } ], "metadata": {} } }, "semantic_grep": { "errors": [ { "code": 3, "level": "warn", "message": "Semgrep Core WARN - Lexical error in file tests/assets/files/test_matcher.test:40\n\tunrecognized symbols: !", "path": "tests/assets/files/test_matcher.test", "type": "Lexical error" }, ], "matches": { "boto-client-ip": { "files": [ { "file_path": "tests/assets/files/example_file.py", "match_lines": [ 4, 4 ], "match_position": [ 24, 31 ], "match_string": "c = boto3.client(host='8.8.8.8')" } ], "metadata": { "cwe": "CWE-1050 Excessive Platform Resource Consumption within a Loop", "description": "boto client using IP address", "owasp-web": "A8: Insecure Deserialization", "severity": "ERROR" } } } } }

Python API

from libsast import Scanner options = {'match_rules': '/Users/ajinabraham/Code/njsscan/njsscan/rules/pattern_matcher', 'sgrep_rules': '/Users/ajinabraham/Code/njsscan/njsscan/rules/semantic_grep', 'sgrep_extensions': {'', '.js'}, 'match_extensions': {'.hbs', '.sh', '.ejs', '.toml', '.mustache', '.tmpl', '.jade', '.json', '.ect', '.vue', '.yml', '.hdbs', '.tl', '.html', '.haml', '.dust', '.pug', '.tpl'}, 'ignore_filenames': {'bootstrap.min.js', '.DS_Store', 'bootstrap-tour.js', 'd3.min.js', 'tinymce.js', 'codemirror.js', 'tinymce.min.js', 'react-dom.production.min.js', 'react.js', 'jquery.min.js', 'react.production.min.js', 'codemirror-compressed.js', 'axios.min.js', 'angular.min.js', 'raphael-min.js', 'vue.min.js'}, 'ignore_extensions': {'.7z', '.exe', '.rar', '.zip', '.a', '.o', '.tz'}, 'ignore_paths': {'__MACOSX', 'jquery', 'fixtures', 'node_modules', 'bower_components', 'example', 'spec'}, 'show_progress': False} paths = ['../njsscan/tests/assets/dot_njsscan/'] scanner = Scanner(options, paths) scanner.scan() {'pattern_matcher': {'handlebar_mustache_template': {'files': [{'file_path': '../njsscan/tests/assets/dot_njsscan/ignore_ext.hbs', 'match_string': '{{{html}}}', 'match_position': (52, 62), 'match_lines': (1, 1)}], 'metadata': {'id': 'handlebar_mustache_template', 'description': 'The Handlebar.js/Mustache.js template has an unescaped variable. Untrusted user input passed to this variable results in Cross Site Scripting (XSS).', 'type': 'Regex', 'pattern': '{{{.+}}}|{{[ ]&[\w]+.}}', 'severity': 'ERROR', 'input_case': 'exact', 'cwe': "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", 'owasp': 'A1: Injection'}}}, 'semantic_grep': {'matches': {'node_aes_ecb': {'files': [{'file_path': '../njsscan/tests/assets/dot_njsscan/lorem_scan.js', 'match_position': (16, 87), 'match_lines': (14, 14), 'match_string': "let decipher = crypto.createDecipheriv('aes-128-ecb', Buffer.from(ENCRYPTION_KEY), iv);"}], 'metadata': {'owasp': 'A9: Using Components with Known Vulnerabilities', 'cwe': 'CWE-327: Use of a Broken or Risky Cryptographic Algorithm', 'description': 'AES with ECB mode is deterministic in nature and not suitable for encrypting large amount of repetitive data.', 'severity': 'ERROR'}}, 'node_tls_reject': {'files': [{'file_path': '../njsscan/tests/assets/dot_njsscan/skip_dir/skip_me.js', 'match_position': (9, 58), 'match_lines': (9, 9), 'match_string': " process.env['NODE_TLS_REJECT_UNAUTHORIZED'] = '0';"}, {'file_path': '../njsscan/tests/assets/dot_njsscan/skip_dir/skip_me.js', 'match_position': (9, 55), 'match_lines': (18, 18), 'match_string': ' process.env.NODE_TLS_REJECT_UNAUTHORIZED = "0";'}], 'metadata': {'owasp': 'A6: Security Misconfiguration', 'cwe': 'CWE-295: Improper Certificate Validation', 'description': "Setting 'NODE_TLS_REJECT_UNAUTHORIZED' to 0 will allow node server to accept self signed certificates and is not a secure behaviour.", 'severity': 'ERROR'}}, 'node_curl_ssl_verify_disable': {'files': [{'file_path': '../njsscan/tests/assets/dot_njsscan/skip_dir/skip_me.js', 'match_position': (5, 11), 'match_lines': (45, 51), 'match_string': ' curl(url,\n\n {\n\n SSL_VERIFYPEER: 0\n\n },\n\n function (err) {\n\n response.end(this.body);\n\n })'}], 'metadata': {'owasp': 'A6: Security Misconfiguration', 'cwe': 'CWE-599: Missing Validation of OpenSSL Certificate', 'description': 'SSL Certificate verification for node-curl is disabled.', 'severity': 'ERROR'}}, 'regex_injection_dos': {'files': [{'file_path': '../njsscan/tests/assets/dot_njsscan/lorem_scan.js', 'match_position': (5, 37), 'match_lines': (25, 27), 'match_string': ' var key = req.param("key");\n\n // Regex created from user input\n\n var re = new RegExp("\\b" + key);'}], 'metadata': {'owasp': 'A1: Injection', 'cwe': 'CWE-400: Uncontrolled Resource Consumption', 'description': 'User controlled data in RegExp() can make the application vulnerable to layer 7 DoS.', 'severity': 'ERROR'}}, 'express_xss': {'files': [{'file_path': '../njsscan/tests/assets/dot_njsscan/skip.js', 'match_position': (9, 55), 'match_lines': (7, 10), 'match_string': ' var str = new Buffer(req.cookies.profile, 'base64').toString();\n\n var obj = serialize.unserialize(str);\n\n if (obj.username) {\n\n res.send("Hello " + escape(obj.username));'}], 'metadata': {'owasp': 'A1: Injection', 'cwe': "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", 'description': 'Untrusted User Input in Response will result in Reflected Cross Site Scripting Vulnerability.', 'severity': 'ERROR'}}, 'generic_path_traversal': {'files': [{'file_path': '../njsscan/tests/assets/dot_njsscan/lorem_scan.js', 'match_position': (5, 35), 'match_lines': (36, 37), 'match_string': " var filePath = path.join(__dirname, '/' + req.query.load);\n\n fileSystem.readFile(filePath); // ignore: generic_path_traversal"}, {'file_path': '../njsscan/tests/assets/dot_njsscan/lorem_scan.js', 'match_position': (5, 35), 'match_lines': (42, 43), 'match_string': " var filePath = path.join(__dirname, '/' + req.query.load);\n\n fileSystem.readFile(filePath); // detect this"}], 'metadata': {'owasp': 'A5: Broken Access Control', 'cwe': 'CWE-23: Relative Path Traversal', 'description': 'Untrusted user input in readFile()/readFileSync() can endup in Directory Traversal Attacks.', 'severity': 'ERROR'}}, 'express_open_redirect': {'files': [{'file_path': '../njsscan/tests/assets/dot_njsscan/lorem_scan.js', 'match_position': (5, 26), 'match_lines': (49, 51), 'match_string': ' var target = req.param("target");\n\n // BAD: sanitization doesn't apply here\n\n res.redirect(target); //ignore: express_open_redirect'}], 'metadata': {'owasp': 'A1: Injection', 'cwe': "CWE-601: URL Redirection to Untrusted Site ('Open Redirect')", 'description': 'Untrusted user input in redirect() can result in Open Redirect vulnerability.', 'severity': 'ERROR'}}, 'node_deserialize': {'files': [{'file_path': '../njsscan/tests/assets/dot_njsscan/skip.js', 'match_position': (19, 45), 'match_lines': (8, 8), 'match_string': ' var obj = serialize.unserialize(str);'}], 'metadata': {'owasp': 'A8: Insecure Deserialization', 'cwe': 'CWE-502: Deserialization of Untrusted Data', 'description': "User controlled data in 'unserialize()' or 'deserialize()' function can result in Object Injection or Remote Code Injection.", 'severity': 'ERROR'}}}, 'errors': [{'type': 'SourceParseError', 'code': 3, 'short_msg': 'parse error', 'long_msg': 'Could not parse .njsscan as javascript', 'level': 'warn', 'spans': [{'start': {'line': 2, 'col': 20}, 'end': {'line': 2, 'col': 21}, 'source_hash': 'c60298be568bfb1325d92cbb3c0bc1450a25b85bb2e4000bdc3267c05f1c8c73', 'file': '.njsscan', 'context_start': None, 'context_end': None}], 'help': 'If the code appears to be valid, this may be a semgrep bug.'}, {'type': 'SourceParseError', 'code': 3, 'short_msg': 'parse error', 'long_msg': 'Could not parse no_ext_scan as javascript', 'level': 'warn', 'spans': [{'start': {'line': 1, 'col': 3}, 'end': {'line': 1, 'col': 5}, 'source_hash': 'f002e2a715be216987dd1b134e7b9fa6eef28e3caa82dead0109c4cdc489e089', 'file': 'no_ext_scan', 'context_start': None, 'context_end': None}], 'help': 'If the code appears to be valid, this may be a semgrep bug.'}]}}

Write you own Static Analysis tool

With libsast, you can write your own static analysis tools. libsast provides two matching engines:

  1. Pattern Matcher
  2. Semantic Grep

Pattern Matcher

Currently Pattern Matcher supports any language.

Use Regex 101 to write simple Python Regex rule patterns.

A sample rule looks like

A rule consist of

  1. Regex - if regex1 in input
  2. RegexAnd - if regex1 in input and regex2 in input
  3. RegexOr - if regex1 in input or regex2 in input
  4. RegexAndOr - if regex1 in input and (regex2 in input or regex3 in input)
  5. RegexAndNot - if regex1 in input and not regex2 in input

Example: Pattern Matcher Rule

Test your pattern matcher rules

$ libsast -p tests/assets/rules/pattern_matcher/patterns.yaml tests/assets/files/

Inbuilt Standard Mapping Support

Metadata fields also support libsast standard mapping.

For example, the metadata field owasp-web: a1 will get expanded at runtime as owasp-web: 'A1: Injection'.

Currently Supports

Semantic Grep

Semantic Grep uses semgrep, a fast and syntax-aware semantic code pattern search for many languages: like grep but for code.

Currently it supports Python, Java, JavaScript, Go and C.

Use semgrep.dev to write semantic grep rule patterns.

A sample rule for Python code looks like

rules:

See semgrep documentation here.

Example: Semantic Grep Rule

Test your semgrep rules

$ libsast -s tests/assets/rules/semantic_grep/sgrep.yaml tests/assets/files/

Realworld Implementations