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https://github.com/securego/gosec

Go security checker
https://github.com/securego/gosec

golang security security-automation security-tools static-analysis static-code-analysis

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Go security checker

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# gosec - Go Security Checker



Inspects source code for security problems by scanning the Go AST and SSA code representation.






## License



Licensed under the Apache License, Version 2.0 (the "License").

You may not use this file except in compliance with the License.

You may obtain a copy of the License [here](http://www.apache.org/licenses/LICENSE-2.0).



## Project status



[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/3218/badge)](https://bestpractices.coreinfrastructure.org/projects/3218)

[![Build Status](https://github.com/securego/gosec/workflows/CI/badge.svg)](https://github.com/securego/gosec/actions?query=workflows%3ACI)

[![Coverage Status](https://codecov.io/gh/securego/gosec/branch/master/graph/badge.svg)](https://codecov.io/gh/securego/gosec)

[![GoReport](https://goreportcard.com/badge/github.com/securego/gosec)](https://goreportcard.com/report/github.com/securego/gosec)

[![GoDoc](https://pkg.go.dev/badge/github.com/securego/gosec/v2)](https://pkg.go.dev/github.com/securego/gosec/v2)

[![Docs](https://readthedocs.org/projects/docs/badge/?version=latest)](https://securego.io/)

[![Downloads](https://img.shields.io/github/downloads/securego/gosec/total.svg)](https://github.com/securego/gosec/releases)

[![Docker Pulls](https://img.shields.io/docker/pulls/securego/gosec.svg)](https://hub.docker.com/r/securego/gosec/tags)

[![Slack](https://img.shields.io/badge/Slack-4A154B?style=for-the-badge&logo=slack&logoColor=white)](http://securego.slack.com)



## Install



### CI Installation



```bash

# binary will be $(go env GOPATH)/bin/gosec

curl -sfL https://raw.githubusercontent.com/securego/gosec/master/install.sh | sh -s -- -b $(go env GOPATH)/bin vX.Y.Z



# or install it into ./bin/

curl -sfL https://raw.githubusercontent.com/securego/gosec/master/install.sh | sh -s vX.Y.Z



# In alpine linux (as it does not come with curl by default)

wget -O - -q https://raw.githubusercontent.com/securego/gosec/master/install.sh | sh -s vX.Y.Z



# If you want to use the checksums provided on the "Releases" page

# then you will have to download a tar.gz file for your operating system instead of a binary file

wget https://github.com/securego/gosec/releases/download/vX.Y.Z/gosec_vX.Y.Z_OS.tar.gz



# The file will be in the current folder where you run the command

# and you can check the checksum like this

echo "  gosec_vX.Y.Z_OS.tar.gz" | sha256sum -c -



gosec --help

```



### GitHub Action



You can run `gosec` as a GitHub action as follows:



```yaml

name: Run Gosec

on:

  push:

    branches:

      - master

  pull_request:

    branches:

      - master

jobs:

  tests:

    runs-on: ubuntu-latest

    env:

      GO111MODULE: on

    steps:

      - name: Checkout Source

        uses: actions/checkout@v3

      - name: Run Gosec Security Scanner

        uses: securego/gosec@master

        with:

          args: ./...

```



### Integrating with code scanning



You can [integrate third-party code analysis tools](https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/integrating-with-code-scanning) with GitHub code scanning by uploading data as SARIF files.



The workflow shows an example of running the `gosec` as a step in a GitHub action workflow which outputs the `results.sarif` file. The workflow then uploads the `results.sarif` file to GitHub using the `upload-sarif` action.



```yaml

name: "Security Scan"



# Run workflow each time code is pushed to your repository and on a schedule.

# The scheduled workflow runs every at 00:00 on Sunday UTC time.

on:

  push:

  schedule:

  - cron: '0 0 * * 0'



jobs:

  tests:

    runs-on: ubuntu-latest

    env:

      GO111MODULE: on

    steps:

      - name: Checkout Source

        uses: actions/checkout@v3

      - name: Run Gosec Security Scanner

        uses: securego/gosec@master

        with:

          # we let the report trigger content trigger a failure using the GitHub Security features.

          args: '-no-fail -fmt sarif -out results.sarif ./...'

      - name: Upload SARIF file

        uses: github/codeql-action/upload-sarif@v2

        with:

          # Path to SARIF file relative to the root of the repository

          sarif_file: results.sarif

```



### Local Installation



```bash

go install github.com/securego/gosec/v2/cmd/gosec@latest

```



## Usage



Gosec can be configured to only run a subset of rules, to exclude certain file

paths, and produce reports in different formats. By default all rules will be

run against the supplied input files. To recursively scan from the current

directory you can supply `./...` as the input argument.



### Available rules



- G101: Look for hard coded credentials

- G102: Bind to all interfaces

- G103: Audit the use of unsafe block

- G104: Audit errors not checked

- G106: Audit the use of ssh.InsecureIgnoreHostKey

- G107: Url provided to HTTP request as taint input

- G108: Profiling endpoint automatically exposed on /debug/pprof

- G109: Potential Integer overflow made by strconv.Atoi result conversion to int16/32

- G110: Potential DoS vulnerability via decompression bomb

- G111: Potential directory traversal

- G112: Potential slowloris attack

- G113: Usage of Rat.SetString in math/big with an overflow (CVE-2022-23772)

- G114: Use of net/http serve function that has no support for setting timeouts

- G201: SQL query construction using format string

- G202: SQL query construction using string concatenation

- G203: Use of unescaped data in HTML templates

- G204: Audit use of command execution

- G301: Poor file permissions used when creating a directory

- G302: Poor file permissions used with chmod

- G303: Creating tempfile using a predictable path

- G304: File path provided as taint input

- G305: File traversal when extracting zip/tar archive

- G306: Poor file permissions used when writing to a new file

- G307: Poor file permissions used when creating a file with os.Create

- G401: Detect the usage of DES, RC4, MD5 or SHA1

- G402: Look for bad TLS connection settings

- G403: Ensure minimum RSA key length of 2048 bits

- G404: Insecure random number source (rand)

- G501: Import blocklist: crypto/md5

- G502: Import blocklist: crypto/des

- G503: Import blocklist: crypto/rc4

- G504: Import blocklist: net/http/cgi

- G505: Import blocklist: crypto/sha1

- G601: Implicit memory aliasing of items from a range statement (only for Go 1.21 or lower)

- G602: Slice access out of bounds



### Retired rules



- G105: Audit the use of math/big.Int.Exp - [CVE is fixed](https://github.com/golang/go/issues/15184)

- G307: Deferring a method which returns an error - causing more inconvenience than fixing a security issue, despite the details from this [blog post](https://www.joeshaw.org/dont-defer-close-on-writable-files/)



### Selecting rules



By default, gosec will run all rules against the supplied file paths. It is however possible to select a subset of rules to run via the `-include=` flag,

or to specify a set of rules to explicitly exclude using the `-exclude=` flag.



```bash

# Run a specific set of rules

$ gosec -include=G101,G203,G401 ./...



# Run everything except for rule G303

$ gosec -exclude=G303 ./...

```



### CWE Mapping



Every issue detected by `gosec` is mapped to a [CWE (Common Weakness Enumeration)](http://cwe.mitre.org/data/index.html) which describes in more generic terms the vulnerability. The exact mapping can be found  [here](https://github.com/securego/gosec/blob/master/issue/issue.go#L50).



### Configuration



A number of global settings can be provided in a configuration file as follows:



```JSON

{

    "global": {

        "nosec": "enabled",

        "audit": "enabled"

    }

}

```



- `nosec`: this setting will overwrite all `#nosec` directives defined throughout the code base

- `audit`: runs in audit mode which enables addition checks that for normal code analysis might be too nosy



```bash

# Run with a global configuration file

$ gosec -conf config.json .

```



Also some rules accept configuration. For instance on rule `G104`, it is possible to define packages along with a list

of functions which will be skipped when auditing the not checked errors:



```JSON

{

    "G104": {

        "ioutil": ["WriteFile"]

    }

}

```



You can also configure the hard-coded credentials rule `G101` with additional patterns, or adjust the entropy threshold:



```JSON

{

    "G101": {

        "pattern": "(?i)passwd|pass|password|pwd|secret|private_key|token",

         "ignore_entropy": false,

         "entropy_threshold": "80.0",

         "per_char_threshold": "3.0",

         "truncate": "32"

    }

}

```



#### Go version



Some rules require a specific Go version which is retrieved from the Go module file present in the project. If this version cannot be found, it will fallback to Go runtime version.



The Go module version is parsed using the `go list` command which in some cases might lead to performance degradation. In this situation, the go module version can be easily provided by setting the environment variable `GOSECGOVERSION=go1.21.1`.



### Dependencies



gosec will fetch automatically the dependencies of the code which is being analyzed when go module is turned on (e.g.`GO111MODULE=on`). If this is not the case,

the dependencies need to be explicitly downloaded by running the `go get -d` command before the scan.



### Excluding test files and folders



gosec will ignore test files across all packages and any dependencies in your vendor directory.



The scanning of test files can be enabled with the following flag:



```bash

gosec -tests ./...

```



Also additional folders can be excluded as follows:



```bash

 gosec -exclude-dir=rules -exclude-dir=cmd ./...

```



### Excluding generated files



gosec can ignore generated go files with default generated code comment.



```

// Code generated by some generator DO NOT EDIT.

```



```bash

gosec -exclude-generated ./...

```



### Annotating code



As with all automated detection tools, there will be cases of false positives.

In cases where gosec reports a failure that has been manually verified as being safe,

it is possible to annotate the code with a comment that starts with `#nosec`.



The `#nosec` comment should have the format `#nosec [RuleList] [-- Justification]`.



The `#nosec` comment needs to be placed on the line where the warning is reported.



```go

func main() {

	tr := &http.Transport{

		TLSClientConfig: &tls.Config{

			InsecureSkipVerify: true, // #nosec G402

		},

	}



	client := &http.Client{Transport: tr}

	_, err := client.Get("https://golang.org/")

	if err != nil {

		fmt.Println(err)

	}

}

```



When a specific false positive has been identified and verified as safe, you may

wish to suppress only that single rule (or a specific set of rules) within a section of code,

while continuing to scan for other problems. To do this, you can list the rule(s) to be suppressed within

the `#nosec` annotation, e.g: `/* #nosec G401 */` or `//#nosec G201 G202 G203`



You could put the description or justification text for the annotation. The

justification should be after the rule(s) to suppress and start with two or

more dashes, e.g: `//#nosec G101 G102 -- This is a false positive`



In some cases you may also want to revisit places where `#nosec` annotations

have been used. To run the scanner and ignore any `#nosec` annotations you

can do the following:



```bash

gosec -nosec=true ./...

```



### Tracking suppressions



As described above, we could suppress violations externally (using `-include`/

`-exclude`) or inline (using `#nosec` annotations) in gosec. This suppression

inflammation can be used to generate corresponding signals for auditing

purposes.



We could track suppressions by the `-track-suppressions` flag as follows:



```bash

gosec -track-suppressions -exclude=G101 -fmt=sarif -out=results.sarif ./...

```



- For external suppressions, gosec records suppression info where `kind` is

`external` and `justification` is a certain sentence "Globally suppressed".

- For inline suppressions, gosec records suppression info where `kind` is

`inSource` and `justification` is the text after two or more dashes in the

comment.



**Note:** Only SARIF and JSON formats support tracking suppressions.



### Build tags



gosec is able to pass your [Go build tags](https://golang.org/pkg/go/build/) to the analyzer.

They can be provided as a comma separated list as follows:



```bash

gosec -tags debug,ignore ./...

```



### Output formats



gosec currently supports `text`, `json`, `yaml`, `csv`, `sonarqube`, `JUnit XML`, `html` and `golint` output formats. By default

results will be reported to stdout, but can also be written to an output

file. The output format is controlled by the `-fmt` flag, and the output file is controlled by the `-out` flag as follows:



```bash

# Write output in json format to results.json

$ gosec -fmt=json -out=results.json *.go

```



Results will be reported to stdout as well as to the provided output file by `-stdout` flag. The `-verbose` flag overrides the 

output format when stdout the results while saving them in the output file

```bash

# Write output in json format to results.json as well as stdout

$ gosec -fmt=json -out=results.json -stdout *.go



# Overrides the output format to 'text' when stdout the results, while writing it to results.json

$ gosec -fmt=json -out=results.json -stdout -verbose=text *.go

```



**Note:** gosec generates the [generic issue import format](https://docs.sonarqube.org/latest/analysis/generic-issue/) for SonarQube, and a report has to be imported into SonarQube using `sonar.externalIssuesReportPaths=path/to/gosec-report.json`.



## Development



### Build



You can build the binary with:



```bash

make

```



### Note on Sarif Types Generation



Install the tool with :



```bash

go get -u github.com/a-h/generate/cmd/schema-generate

```



Then generate the types with :



```bash

schema-generate -i sarif-schema-2.1.0.json -o mypath/types.go

```



Most of the MarshallJSON/UnmarshalJSON are removed except the one for PropertyBag which is handy to inline the additional properties. The rest can be removed.

The URI,ID, UUID, GUID were renamed so it fits the Go convention defined [here](https://github.com/golang/lint/blob/master/lint.go#L700)



### Tests



You can run all unit tests using:



```bash

make test

```



### Release



You can create a release by tagging the version as follows:



``` bash

git tag v1.0.0 -m "Release version v1.0.0"

git push origin v1.0.0

```



The GitHub [release workflow](.github/workflows/release.yml) triggers immediately after the tag is pushed upstream. This flow will

release the binaries using the [goreleaser](https://goreleaser.com/actions/) action and then it will build and publish the docker image into Docker Hub.



The released artifacts are signed using [cosign](https://docs.sigstore.dev/). You can use the public key from [cosign.pub](cosign.pub) 

file to verify the signature of docker image and binaries files.



The docker image signature can be verified with the following command:

```

cosign verify --key cosign.pub securego/gosec:

```

 

The binary files signature can be verified with the following command:

```

cosign verify-blob --key cosign.pub --signature gosec__darwin_amd64.tar.gz.sig  gosec__darwin_amd64.tar.gz

```



### Docker image



You can also build locally the docker image by using the command:



```bash

make image

```



You can run the `gosec` tool in a container against your local Go project. You only have to mount the project

into a volume as follows:



```bash

docker run --rm -it -w // -v /:/ securego/gosec //...

```



**Note:** the current working directory needs to be set with `-w` option in order to get successfully resolved the dependencies from go module file



### Generate TLS rule



The configuration of TLS rule can be generated from [Mozilla's TLS ciphers recommendation](https://statics.tls.security.mozilla.org/server-side-tls-conf.json).



First you need to install the generator tool:



```bash

go get github.com/securego/gosec/v2/cmd/tlsconfig/...

```



You can invoke now the `go generate` in the root of the project:



```bash

go generate ./...

```



This will generate the `rules/tls_config.go` file which will contain the current ciphers recommendation from Mozilla.



## Who is using gosec?



This is a [list](USERS.md) with some of the gosec's users.



## Sponsors



Support this project by becoming a sponsor. Your logo will show up here with a link to your website