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196edd34b6
Currently, if you download the gosec binary using the commands suggested in the README and you decide to check the checksum of the binary, you just downloaded then your checksum check will fail. As a result, the user can think that your binary is corrupted. The reason for that failure is that the checksums are for the tar.gz files provided in the release notes. This should be documented to avoid future unclarities. Signed-off-by: Martin Vrachev <mvrachev@vmware.com>
257 lines
8 KiB
Markdown
257 lines
8 KiB
Markdown
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# gosec - Golang Security Checker
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Inspects source code for security problems by scanning the Go AST.
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<img src="https://securego.io/img/gosec.png" width="320">
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## License
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License [here](http://www.apache.org/licenses/LICENSE-2.0).
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## Project status
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[](https://travis-ci.org/securego/gosec)
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[](https://codecov.io/gh/securego/gosec)
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[](https://goreportcard.com/badge/github.com/securego/gosec)
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[](https://godoc.org/github.com/securego/gosec)
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[](https://securego.io/)
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[](https://github.com/securego/gosec/releases)
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[](https://hub.docker.com/r/securego/gosec/tags)
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[](http://securego.herokuapp.com)
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## Install
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### CI Installation
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```bash
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# binary will be $GOPATH/bin/gosec
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curl -sfL https://raw.githubusercontent.com/securego/gosec/master/install.sh | sh -s -- -b $GOPATH/bin vX.Y.Z
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# or install it into ./bin/
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curl -sfL https://raw.githubusercontent.com/securego/gosec/master/install.sh | sh -s vX.Y.Z
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# In alpine linux (as it does not come with curl by default)
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wget -O - -q https://raw.githubusercontent.com/securego/gosec/master/install.sh | sh -s vX.Y.Z
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# If you want to use the checksums provided on the "Releases" page
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# then you will have to download a tar.gz file for your operating system instead of a binary file
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wget https://github.com/securego/gosec/releases/download/vX.Y.Z/gosec_vX.Y.Z_OS.tar.gz
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# The file will be in the current folder where you run the command
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# and you can check the checksum like this
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echo "<check sum from the check sum file> gosec_vX.Y.Z_OS.tar.gz" | sha256sum -c -
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gosec --help
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```
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### Local Installation
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```bash
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go get github.com/securego/gosec/cmd/gosec
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```
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## Usage
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Gosec can be configured to only run a subset of rules, to exclude certain file
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paths, and produce reports in different formats. By default all rules will be
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run against the supplied input files. To recursively scan from the current
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directory you can supply './...' as the input argument.
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### Selecting rules
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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,
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or to specify a set of rules to explicitly exclude using the '-exclude=' flag.
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### Available rules
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- G101: Look for hard coded credentials
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- G102: Bind to all interfaces
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- G103: Audit the use of unsafe block
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- G104: Audit errors not checked
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- G105: Audit the use of math/big.Int.Exp
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- G106: Audit the use of ssh.InsecureIgnoreHostKey
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- G107: Url provided to HTTP request as taint input
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- G201: SQL query construction using format string
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- G202: SQL query construction using string concatenation
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- G203: Use of unescaped data in HTML templates
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- G204: Audit use of command execution
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- G301: Poor file permissions used when creating a directory
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- G302: Poor file permissions used with chmod
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- G303: Creating tempfile using a predictable path
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- G304: File path provided as taint input
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- G305: File traversal when extracting zip archive
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- G401: Detect the usage of DES, RC4, MD5 or SHA1
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- G402: Look for bad TLS connection settings
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- G403: Ensure minimum RSA key length of 2048 bits
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- G404: Insecure random number source (rand)
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- G501: Import blacklist: crypto/md5
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- G502: Import blacklist: crypto/des
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- G503: Import blacklist: crypto/rc4
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- G504: Import blacklist: net/http/cgi
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- G505: Import blacklist: crypto/sha1
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```bash
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# Run a specific set of rules
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$ gosec -include=G101,G203,G401 ./...
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# Run everything except for rule G303
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$ gosec -exclude=G303 ./...
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```
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### Configuration
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A number of global settings can be provided in a configuration file as follows:
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```JSON
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{
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"global": {
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"nosec": "enabled",
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"audit": "enabled"
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}
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}
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```
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- `nosec`: this setting will overwrite all `#nosec` directives defined throughout the code base
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- `audit`: runs in audit mode which enables addition checks that for normal code analysis might be too nosy
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```bash
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# Run with a global configuration file
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$ gosec -conf config.json .
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```
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### Excluding files
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gosec will ignore tests files and any dependencies in your vendor directory. The scanning of these artifacts can be enabled with the following flags:
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```bash
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gosec -tests -vendor ./...
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```
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### Annotating code
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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 '#nosec' comment.
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The annotation causes gosec to stop processing any further nodes within the
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AST so can apply to a whole block or more granularly to a single expression.
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```go
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import "md5" // #nosec
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func main(){
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/* #nosec */
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if x > y {
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h := md5.New() // this will also be ignored
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}
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}
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```
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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 `
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In some cases you may also want to revisit places where #nosec annotations
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have been used. To run the scanner and ignore any #nosec annotations you
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can do the following:
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```bash
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gosec -nosec=true ./...
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```
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### Build tags
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gosec is able to pass your [Go build tags](https://golang.org/pkg/go/build/) to the analyzer.
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They can be provided as a comma separated list as follows:
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```bash
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gosec -tag debug,ignore ./...
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```
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### Output formats
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gosec currently supports text, json, yaml, csv, sonarqube and JUnit XML output formats. By default
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results will be reported to stdout, but can also be written to an output
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file. The output format is controlled by the '-fmt' flag, and the output file is controlled by the '-out' flag as follows:
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```bash
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# Write output in json format to results.json
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$ gosec -fmt=json -out=results.json *.go
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```
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## Development
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### Build
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```bash
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make
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```
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### Tests
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```bash
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make test
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```
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### Release Build
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Make sure you have installed the [goreleaser](https://github.com/goreleaser/goreleaser) tool and then you can release gosec as follows:
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```bash
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git tag 1.0.0
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export GITHUB_TOKEN=<YOUR GITHUB TOKEN>
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make release
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```
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The released version of the tool is available in the `dist` folder. The build information should be displayed in the usage text.
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```bash
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./dist/darwin_amd64/gosec -h
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gosec - Golang security checker
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gosec analyzes Go source code to look for common programming mistakes that
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can lead to security problems.
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VERSION: 1.0.0
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GIT TAG: 1.0.0
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BUILD DATE: 2018-04-27T12:41:38Z
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```
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Note that all released archives are also uploaded to GitHub.
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### Docker image
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You can build the docker image as follows:
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```bash
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make image
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```
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You can run the `gosec` tool in a container against your local Go project. You just have to mount the project
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into a volume as follow:
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```bash
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docker run -it -v <YOUR PROJECT PATH>/<PROJECT>:/<PROJECT> securego/gosec /<PROJECT>/...
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```
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### Generate TLS rule
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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).
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First you need to install the generator tool:
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```bash
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go get github.com/securego/gosec/cmd/tlsconfig/...
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```
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You can invoke now the `go generate` in the root of the project:
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```bash
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go generate ./...
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```
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This will generate the `rules/tls_config.go` file with will contain the current ciphers recommendation from Mozilla.
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