[![Build Status](https://travis-ci.org/EscherAuth/escher.svg?branch=master)](https://travis-ci.org/EscherAuth/escher) Escher - HTTP request signing lib
===================================

Go implementation of the [AWS4](http://docs.aws.amazon.com/general/latest/gr/sigv4_signing.html) compatible [Escher](https://github.com/emartech/escher) HTTP request signing and authentication library.

Prerequisite
------------

this will download the test cases for the escher implementation, and set in the env the required env key(s)

```sh
    source .envrc
```

Run the tests
-------------

in 1.9:

```sh
go test ./...
```

in older go versions:

```sh
go test $(go list ./... | grep -v /vendor/)
```

About Escher
------------

More details are available at our [Escher documentation site](http://escherauth.io/).

Install
-------

```bash
# install dep management tool
go get -u github.com/golang/dep/cmd/dep
# dep ensure the missing dependency packages
dep ensure
```

ENV configuration
-----------------

## Configuration

Everything except the Credential scope is optional.

### ESCHER_CONFIG

JSON string that can include the all the configuration parameters:
* credentialScope
* vendorKey
* algoPrefix
* hashAlgo
* authHeaderName
* dateHeaderName

### ESCHER_ALGO_PREFIX
Set the used Algo prefix when config json not includes it

### ESCHER_HASH_ALGO
set the hashAlgo when config json not includes it

### ESCHER_VENDOR_KEY
set the vendorKey when config json not includes it

### ESCHER_AUTH_HEADER_NAME
set the AUTH_HEADER_name when config json not includes it

### ESCHER_DATE_HEADER_NAME
set the DATE_HEADER_name when config json not includes it

### ESCHER_CREDENTIAL_SCOPE
set the credentialScope when config json not includes it

## KeyPool 

### KEY_POOL

JSON serialized array of map that contains credentials with the following keys definitions:
* keyId
* secret


github.com/EscherAuth/escher

escher

(Experimental) An ambiguous license classifier was found.

What is an ambiguous license classifier?

Ambiguous License Classifier

Source files are encoded using a non-standard text encoding.

What is bad text encoding?

Bad text encoding

Package version is not a valid semantic version (semver).

What is bad semver?

Bad semver

Package has dependencies with an invalid semantic version. This could be a sign of beta, low quality, or unmaintained dependencies.

What is bad dependency semver?

Bad dependency semver

Source files contain bidirectional unicode control characters. This could indicate a Trojan source supply chain attack. See: trojansource.codes for more information.

What are bidirectional unicode control characters?

Bidirectional unicode control characters

This package has multiple bin scripts with the same name. This can cause non-deterministic behavior when installing or could be a sign of a supply chain attack.

What is bin script confusion?

Bin script confusion

This Chrome extension includes a content script '{scriptFile}' that runs on websites matching '{matches}'.

What are Chrome extension content scripts?

Chrome Extension Content Script

This Chrome extension requests access to '{host}'.

What are Chrome extension host permissions?

Chrome Extension Host Permission

This Chrome extension uses the '{permission}' permission.

What are Chrome extension permissions?

Chrome Extension Permission

This Chrome extension requests broad access to websites with the pattern '{host}'.

What are Chrome extension wildcard host permissions?

Chrome Extension Wildcard Host Permission

Semantic versions published out of chronological order.

What is a chronological version anomaly?

Chronological version anomaly

Project maintainer's SSH key has been compromised.

What is a compromised SSH key?

Compromised SSH key

(Experimental) Copyleft license information was found.

What do I need to know about license files?

Copyleft License

Contains a Critical Common Vulnerability and Exposure (CVE).

What is a critical CVE?

Title

Critical CVE

Contains a high severity Common Vulnerability and Exposure (CVE).

What is a CVE?

High CVE

Uses debug, reflection and dynamic code execution features.

What is debug access?

Debug access

The maintainer of the package marked it as deprecated. This could indicate that a single version should not be used, or that the package is no longer maintained and any new vulnerabilities will not be fixed.

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Deprecated

(Experimental) Contains a known deprecated SPDX license exception.

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Deprecated SPDX exception

(Experimental) License is deprecated which may have legal implications regarding the package's use.

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Deprecated license

Package name is similar to other popular packages and may not be the package you want.

What is a typosquat?

Possible typosquat attack

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What is dynamic require?

Dynamic require

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What is an empty package?

Empty package

Package accesses environment variables, which may be a sign of credential stuffing or data theft.

What is environment variable access?

Environment variable access

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Package optionally loads a dependency which is not specified within any of the package.json dependency fields. It may inadvertently be importing dependencies specified by other packages.

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Name

Extraneous dependency

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File dependency

Accesses the file system, and could potentially read sensitive data.

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Filesystem access

Package has a dependency with a floating version range. This can cause issues if the dependency publishes a new major version.

What are wildcard dependencies?

Wildcard dependency

Contains a dependency which resolves to a remote git URL. Dependencies fetched from git URLs are not immutable and can be used to inject untrusted code or reduce the likelihood of a reproducible install.

What are git dependencies?

Git dependency

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What are GitHub dependencies?

GitHub dependency

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AI-detected potential code anomaly

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AI-detected possible typosquat

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AI-detected potential malware

AI has determined that this package may contain potential security issues or vulnerabilities.

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AI-detected potential security risk

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Why is native code a concern?

Native code

Contains high entropy strings. This could be a sign of encrypted data, leaked secrets or obfuscated code.

What are high entropy strings?

High entropy strings

Contains unicode homoglyphs which can be used in supply chain confusion attacks.

What are unicode homoglyphs?

Unicode homoglyphs

Contains a dependency which resolves to a remote HTTP URL which could be used to inject untrusted code and reduce overall package reliability.

What are http dependencies?

HTTP dependency

Install scripts are run when the package is installed. The majority of malware in npm is hidden in install scripts.

What is an install script?

Install scripts

Package has an invalid manifest file and can cause installation problems if you try to use it.

What is an invalid manifest file?

Invalid manifest file

Source files contain invisible characters. This could indicate source obfuscation or a supply chain attack.

What are invisible characters?

Invisible chars

(Experimental) Package license has recently changed.

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License change

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License exception

This package is not allowed per your license policy. Review the package's license to ensure compliance.

What is a license policy violation?

License Policy Violation

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What's wrong with long strings?

Long strings

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

What is a major refactor?

Major refactor

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Known malware

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Manifest confusion

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Medium CVE

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Low CVE

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Minified code

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Misc. License Issues

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Non-existent author

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Missing dependency

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Missing license

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Mixed license

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Modified license exception

(Experimental) Package contains a modified version of an SPDX license. Please read carefully before using this code.

What is a modified license?

Modified license

What is network access?

Network access

A new npm collaborator published a version of the package for the first time. New collaborators are usually benign additions to a project, but do indicate a change to the security surface area of a package.

What is new author?

New author

Package does not specify a list of contributors or an author in package.json.

Why is contributor and author data important?

No contributors or author data

Package does not have a linked bug tracker in package.json.

Why are bug trackers important?

No bug tracker

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Why are READMEs important?

No README

Package does not have a linked source code repository. Without this field, a package will have no reference to the location of the source code use to generate the package.

Why are missing repositories important?

No repository

Package does not have any tests. This is a strong signal of a poorly maintained or low quality package.

github.com/EscherAuth/escher

Prerequisite

Run the tests

About Escher

Install

ENV configuration

Configuration

ESCHER_CONFIG

ESCHER_ALGO_PREFIX

ESCHER_HASH_ALGO

ESCHER_VENDOR_KEY

ESCHER_AUTH_HEADER_NAME

ESCHER_DATE_HEADER_NAME

ESCHER_CREDENTIAL_SCOPE

KeyPool

KEY_POOL

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