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112 lines
3.5 KiB
Markdown
112 lines
3.5 KiB
Markdown
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## GAS - Go AST Scanner
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Inspects source code for security problems by scanning the Go AST.
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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/HewlettPackard/gas)
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Gas is still in alpha and accepting feedback from early adopters. We do
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not consider it production ready at this time.
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### Usage
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Gas 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 Gas 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 hardcoded 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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- 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 permisions used with chmod
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- G303: Creating tempfile using a predictable path
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- G401: Detect the usage of DES, RC4, or MD5
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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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```
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# Run a specific set of rules
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$ gas -include=G101,G203,G401 ./...
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# Run everything except for rule G303
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$ gas -exclude=G303 ./...
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```
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#### Excluding files:
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Gas can be told to \ignore paths that match a supplied pattern using the 'skip' command line option. This accomplished via
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[filepath.Match](https://golang.org/pkg/path/filepath/#Match). Multiple patterns can be specified as follows:
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```
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$ gas -skip=tests* -skip=*_example.go ./...
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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 Gas 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 Gas 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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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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```
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$ gas -nosec=true ./...
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```
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### Output formats
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Gas currently supports text, json and csv 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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```
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# Write output in json format to results.json
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$ gas -fmt=json -out=results.json *.go
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```
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