semgrep

To use SemGrep in MegaLinter you must define a list of rulesets to use.

Example: REPOSITORY_SEMGREP_RULESETS: ["p/docker-compose","p/owasp-top-ten"]

Exception for standalone and security flavors docker images, that use a list of security rulesets by default.

semgrep documentation

• Version in MegaLinter: 3.12
• Visit Official Web Site
• See How to configure semgrep rules
• See How to disable semgrep rules in files
• See How to ignore files and directories with semgrep
  • You can define a .semgrepignore file to ignore files and folders
• See Index of problems detected by semgrep

Configuration in MegaLinter

• Enable semgrep by adding REPOSITORY_SEMGREP in ENABLE_LINTERS variable
• Disable semgrep by adding REPOSITORY_SEMGREP in DISABLE_LINTERS variable

IDE Integration

Use semgrep in your favorite IDE to catch errors before MegaLinter !

	IDE	Extension Name	Install
	Visual Studio Code	VSCode SemGrep

MegaLinter Flavours

This linter is available in the following flavours

	Flavor	Description	Embedded linters	Info
	all	Default MegaLinter Flavor	125
	c_cpp	Optimized for pure C/C++ projects	56
	cupcake	MegaLinter for the most commonly used languages	84
	documentation	MegaLinter for documentation projects	51
	dotnet	Optimized for C, C++, C# or VB based projects	63
	dotnetweb	Optimized for C, C++, C# or VB based projects with JS/TS	72
	go	Optimized for GO based projects	53
	java	Optimized for JAVA based projects	54
	javascript	Optimized for JAVASCRIPT or TYPESCRIPT based projects	61
	php	Optimized for PHP based projects	56
	python	Optimized for PYTHON based projects	64
	ruby	Optimized for RUBY based projects	52
	rust	Optimized for RUST based projects	52
	salesforce	Optimized for Salesforce based projects	56
	security	Optimized for security	24
	swift	Optimized for SWIFT based projects	52
	terraform	Optimized for TERRAFORM based projects	56

Behind the scenes

How are identified applicable files

• If this linter is active, all files will always be linted

How the linting is performed

semgrep is called once on the whole project directory (project CLI lint mode)

• filtering can not be done using MegaLinter configuration variables,it must be done using semgrep configuration or ignore file (if existing)
• VALIDATE_ALL_CODEBASE: false doesn't make semgrep analyze only updated files

Example calls

semgrep /tmp/lint

semgrep 

Help content

NAME
       semgrep scan - run semgrep rules on files

SYNOPSIS
       semgrep scan [OPTION]… [TARGETS]…

DESCRIPTION
       Searches TARGET paths for matches to rules or patterns. Defaults to
       searching entire current working directory.

       To get started quickly, run

       semgrep --config auto .

       This will automatically fetch rules for your project from the Semgrep
       Registry. NOTE: Using `--config auto` will log in to the Semgrep
       Registry with your project URL.

       For more information about Semgrep, go to https://semgrep.dev.

       NOTE: By default, Semgrep will report pseudonymous usage metrics to
       its server if you pull your configuration from the Semgrep registry.
       To learn more about how and why these metrics are collected, please
       see https://semgrep.dev/docs/metrics. To modify this behavior, see the
       --metrics option below.

ARGUMENTS
       TARGETS
           Files or folders to be scanned by semgrep.

OPTIONS
       -a, --autofix
           Apply autofix patches. WARNING: data loss can occur with this
           flag. Make sure your files are stored in a version control system.
           Note that this mode is experimental and not guaranteed to function
           properly.

       --allow-untrusted-validators
           Allows running rules with validators from origins other than
           semgrep.dev. Avoid running rules from origins you don't trust.

       --baseline-commit=VAL (absent SEMGREP_BASELINE_COMMIT env)
           Only show results that are not found in this commit hash. Aborts
           run if not currently in a git directory, there are unstaged
           changes, or given baseline hash doesn't exist.

       -d, --dump-command-for-core
           <internal, do not use>

       --dataflow-traces
           Explain how non-local values reach the location of a finding (only
           affects text and SARIF output).

       --debug
           All of --verbose, but with additional debugging information.

       --develop
           Living on the edge.

       --diff-depth=VAL (absent=2)
           The depth of the Pro (interfile) differential scan, the number of
           steps (both in the caller and callee sides) from the targets in
           the call graph tracked by the deep preprocessor. Only applied in
           differential scan mode. Default to 2.

       --disable-nosem
           negates --enable-nosem

       --disable-version-check
           negates --enable-version-check

       --dryrun
           If --dryrun, does not write autofixes to a file. This will print
           the changes to the console. This lets you see the changes before
           you commit to them. Only works with the --autofix flag. Otherwise
           does nothing.

       --dump-ast
           If --dump-ast, shows AST of the input file or passed expression
           and then exit (can use --json).

       --dump-engine-path
           <internal, do not use>

       -e VAL, --pattern=VAL
           Code search pattern. See
           https://semgrep.dev/docs/writing-rules/pattern-syntax for
           information on pattern features.

       --emacs
           Output results in Emacs single-line format.

       --emacs-output=VAL
           Write a copy of the emacs output to a file or post to or post to
           URL.

       --enable-nosem
           Enables 'nosem'. Findings will not be reported on lines containing
           a 'nosem' comment at the end. Enabled by default.

       --enable-version-check (absent SEMGREP_ENABLE_VERSION_CHECK env)
           Checks Semgrep servers to see if the latest version is run;
           disabling this may reduce exit time after returning results.

       --error
           Exit 1 if there are findings. Useful for CI and scripts.

       --exclude=PATTERN
           Skip any file or directory whose path that matches PATTERN.
           '--exclude=*.py' will ignore the following: 'foo.py',
           'src/foo.py', 'foo.py/bar.sh'. '--exclude=tests' will ignore
           'tests/foo.py' as well as 'a/b/tests/c/foo.py'. Multiple
           '--exclude' options may be specified. PATTERN is a glob-style
           pattern that uses the same syntax as gitignore and semgrepignore,
           which is documented at
           https://git-scm.com/docs/gitignore#_pattern_format

       --exclude-rule=VAL
           Skip any rule with the given id. Can add multiple times.

       --experimental
           Enable experimental features.

       -f VAL, -c VAL, --config=VAL (absent SEMGREP_RULES env)
           YAML configuration file, directory of YAML files ending in
           .yml|.yaml, URL of a configuration file, or Semgrep registry entry
           name. Use --config auto to automatically obtain rules tailored to
           this project; your project URL will be used to log in to the
           Semgrep registry. To run multiple rule files simultaneously, use
           --config before every YAML, URL, or Semgrep registry entry name.
           For example `semgrep --config p/python --config
           myrules/myrule.yaml` See
           https://semgrep.dev/docs/writing-rules/rule-syntax for information
           on configuration file format.

       --files-with-matches
           Output only the names of files containing matches

       --force-color (absent SEMGREP_FORCE_COLOR env)
           Always include ANSI color in the output, even if not writing to a
           TTY; defaults to using the TTY status

       --gitlab-sast
           Output results in GitLab SAST format.

       --gitlab-sast-output=VAL
           Write a copy of the GitLab SAST output to a file or post to or
           post to URL.

       --gitlab-secrets
           Output results in GitLab Secrets format.

       --gitlab-secrets-output=VAL
           Write a copy of the GitLab Secrets output to a file or post to or
           post to URL.

       --historical-secrets
           Scans git history using Secrets rules.

       --include=PATTERN
           Specify files or directories that should be scanned by semgrep,
           excluding other files. This filter is applied after these other
           filters: '--exclude' options, any filtering done by git (or other
           SCM), and filtering by '.semgrepignore' files. Multiple
           '--include' options can be specified. A file path is selected if
           it matches at least one of the include patterns. PATTERN is a
           glob-style pattern such as 'foo.*' that must match the path. For
           example, specifying the language with '-l javascript' might
           preselect files 'src/foo.jsx' and 'lib/bar.js'. Specifying one of
           '--include=src', '--include=*.jsx', or '--include=src/foo.*' will
           restrict the selection to the single file 'src/foo.jsx'. A choice
           of multiple '--include' patterns can be specified. For example,
           '--include=foo.* --include=bar.*' will select both 'src/foo.jsx'
           and 'lib/bar.js'. Glob-style patterns follow the syntax supported
           by gitignore and semgrepignore, which is documented at
           https://git-scm.com/docs/gitignore#_pattern_format

       --incremental-output
           Output results incrementally.

       --interfile-timeout=VAL (absent=0)
           Maximum time to spend on interfile analysis. If set to 0 will not
           have time limit. Defaults to 0 s for all CLI scans. For CI scans,
           it defaults to 3 hours.

       -j VAL, --jobs=VAL (absent=4)
           Number of subprocesses to use to run checks in parallel. Defaults
           to the number of cores detected on the system (1 if using --pro).

       --json
           Output results in Semgrep's JSON format.

       --json-output=VAL
           Write a copy of the json output to a file or post to or post to
           URL.

       --junit-xml
           Output results in JUnit XML format.

       --junit-xml-output=VAL
           Write a copy of the JUnit XML output to a file or post to or post
           to URL.

       -l VAL, --lang=VAL
           Parse pattern and all files in specified language. Must be used
           with -e/--pattern.

       --legacy
           Prefer old (legacy) behavior.

       --matching-explanations
           Add debugging information in the JSON output to trace how
           different parts of a rule are matched (a.k.a., "Inspect Rule" in
           the Semgrep playground)

       --max-chars-per-line=VAL (absent=160)
           Maximum number of characters to show per line.

       --max-lines-per-finding=VAL (absent=10)
           Maximum number of lines of code that will be shown for each match
           before trimming (set to 0 for unlimited).

       --max-memory=VAL (absent=0)
           Maximum system memory in MiB to use during the interfile
           pre-processing phase, or when running a rule on a single file. If
           set to 0, will not have memory limit. Defaults to 0. For CI scans
           that use the Pro Engine, defaults to 5000 MiB.

       --max-target-bytes=VAL (absent=1000000)
           Maximum size for a file to be scanned by Semgrep, e.g '1.5MB'. Any
           input program larger than this will be ignored. A zero or negative
           value disables this filter. Defaults to 1000000 bytes

       --metrics=VAL (absent=auto or SEMGREP_SEND_METRICS env)
           Configures how usage metrics are sent to the Semgrep server. If
           'auto', metrics are sent whenever the --config value pulls from
           the Semgrep server. If 'on', metrics are always sent. If 'off',
           metrics are disabled altogether and not sent. If absent, the
           SEMGREP_SEND_METRICS environment variable value will be used. If
           no environment variable, defaults to 'auto'.

       --no-autofix
           negates -a/--autofix

       --no-dryrun
           negates --dryrun

       --no-error
           negates --error

       --no-force-color
           negates --force-color

       --no-git-ignore
           negates --use-git-ignore

       --no-rewrite-rule-ids
           negates --rewrite-rule-ids

       --no-secrets-validation
           Disables secret validation.

       --no-strict
           negates --strict

       --no-test-ignore-todo
           negates --test-ignore-todo

       --no-time
           negates --time

       --no-trace
           negates --trace

       -o VAL, --output=VAL
           Save search results to a file or post to URL. Default is to print
           to stdout.

       --optimizations=VAL (absent=all)
           Turn on/off optimizations. Default = 'all'. Use 'none' to turn all
           optimizations off.

       --oss-only
           Run using only OSS features, even if the Semgrep Pro toggle is on.

       --pro
           Inter-file analysis and Pro languages (currently Apex and Elixir).
           Requires Semgrep Pro Engine. See
           https://semgrep.dev/products/pro-engine/ for more.

       --pro-intrafile
           Intra-file inter-procedural taint analysis. Implies
           --pro-languages. Requires Semgrep Pro Engine. See
           https://semgrep.dev/products/pro-engine/ for more.

       --pro-languages
           Enable Pro languages (currently Apex and Elixir). Requires Semgrep
           Pro Engine. See https://semgrep.dev/products/pro-engine/ for more.

       --profile
           <undocumented>

       --project-root=VAL
           The project root for gitignore and semgrepignore purposes is
           detected automatically from the presence of a .git/ directory in
           the current directory or one of its parents. If not found, the
           current directory is used as the project root. This option forces
           a specific directory to be the project root. This is useful for
           testing or for restoring compatibility with older semgrep
           implementations that only looked for a .semgrepignore file in the
           current directory.

       -q, --quiet
           Only output findings.

       --remote=VAL
           Remote will quickly checkout and scan a remote git repository of
           the format "http[s]://<WEBSITE>/.../<REPO>.git". Must be run with
           --pro Incompatible with --project-root. Note this requires an
           empty CWD as this command will clone the repository into the CWD

       --replacement=VAL
           An autofix expression that will be applied to any matches found
           with --pattern. Only valid with a command-line specified pattern.

       --rewrite-rule-ids
           Rewrite rule ids when they appear in nested sub-directories (Rule
           'foo' in test/rules.yaml will be renamed 'test.foo').

       --sarif
           Output results in SARIF format.

       --sarif-output=VAL
           Write a copy of the SARIF output to a file or post to or post to
           URL.

       --scan-unknown-extensions
           If true, target files specified directly on the command line will
           bypass normal language detection. They will be analyzed according
           to the value of --lang if applicable, or otherwise with the
           analyzers/languages specified in the Semgrep rule(s) regardless of
           file extension or file type. This setting doesn't apply to target
           files discovered by scanning folders. Defaults to false.

       --secrets
           Run Semgrep Secrets product, including support for secret
           validation. Requires access to Secrets, contact
           support@semgrep.com for more information.

       --severity=VAL
           Report findings only from rules matching the supplied severity
           level. By default all applicable rules are run. Can add multiple
           times. Each should be one of INFO, WARNING, or ERROR.

       --show-supported-languages
           Print a list of languages that are currently supported by Semgrep.

       --skip-unknown-extensions
           negates --scan-unknown-extensions

       --strict
           Return a nonzero exit code when WARN level errors are encountered.
           Fails early if invalid configuration files are present. Defaults
           to --no-strict.

       --test
           Run test suite.

       --test-ignore-todo
           If --test-ignore-todo, ignores rules marked as '#todoruleid:' in
           test files.

       --text
           Output results in text format.

       --text-output=VAL
           Write a copy of the text output to a file or post to or post to
           URL.

       --time
           Include a timing summary with the results. If output format is
           json, provides times for each pair (rule, target).

       --timeout=VAL (absent=5.)
           Maximum time to spend running a rule on a single file in seconds.
           If set to 0 will not have time limit. Defaults to 5.0 s.

       --timeout-threshold=VAL (absent=3)
           Maximum number of rules that can time out on a file before the
           file is skipped. If set to 0 will not have limit. Defaults to 3.

       --trace
           Record traces from Semgrep scans to help debugging. This feature
           is meant for internal use and may be changed or removed without
           warning.

       --trace-endpoint=VAL
           Endpoint to send OpenTelemetry traces to, if `--trace` is present.
           The value may be `semgrep-prod` (default), `semgrep-dev`,
           `semgrep-local`, or any valid URL. This feature is meant for
           internal use and may be changed or removed wihtout warning.

       --use-git-ignore
           Skip files ignored by git. Scanning starts from the root folder
           specified on the Semgrep command line. Normally, if the scanning
           root is within a git repository, only the tracked files and the
           new files would be scanned. Git submodules and git- ignored files
           would normally be skipped. --no-git-ignore will disable git-aware
           filtering. Setting this flag does nothing if the scanning root is
           not in a git repository.

       --use-osemgrep-sarif
           Output results using osemgrep.

       -v, --verbose
           Show more details about what rules are running, which files failed
           to parse, etc.

       --validate
           Validate configuration file(s). This will check YAML files for
           errors and run 'p/semgrep-rule-lints' on the YAML files. No search
           is performed.

       --version
           Show the version and exit.

       --vim
           Output results in vim single-line format.

       --vim-output=VAL
           Write a copy of the vim output to a file or post to or post to
           URL.

       --x-ls
           [INTERNAL] List the selected target files and the skipped target
           files before any rule-specific or language-specific filtering.
           Then exit. The output format is unspecified. THIS OPTION IS NOT
           PART OF THE SEMGREP API AND MAY CHANGE OR DISAPPEAR WITHOUT
           NOTICE.

COMMON OPTIONS
       --help[=FMT] (default=auto)
           Show this help in format FMT. The value FMT must be one of auto,
           pager, groff or plain. With auto, the format is pager or plain
           whenever the TERM env var is dumb or undefined.

EXIT STATUS
       semgrep scan exits with:

       0   on success.

       123 on indiscriminate errors reported on standard error.

       124 on command line parsing errors.

       125 on unexpected internal errors (bugs).

ENVIRONMENT
       These environment variables affect the execution of semgrep scan:

       SEMGREP_BASELINE_COMMIT
           See option --baseline-commit.

       SEMGREP_ENABLE_VERSION_CHECK
           See option --enable-version-check.

       SEMGREP_FORCE_COLOR
           See option --force-color.

       SEMGREP_RULES
           See option --config.

       SEMGREP_SEND_METRICS
           See option --metrics.

AUTHORS
       Semgrep Inc. <support@semgrep.com>

BUGS
       If you encounter an issue, please report it at
       https://github.com/semgrep/semgrep/issues

Installation on mega-linter Docker image

• PIP packages (Python):
  • semgrep