Bitcoin maven repository

Bitcoin Libraries

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There are strictly only two types of repositories: The local repository refers to a copy on your own installation that is a cache of the remote downloads, and also contains the temporary build artifacts that you have not yet released.

Remote repositories refer to any other type of repository, accessed by a variety of protocols such as file: These repositories might be a truly remote repository set up by a third party to provide their artifacts for downloading for example, repo. Other "remote" repositories may be internal repositories set up on a file or HTTP server within your company, used to share private artifacts between development teams and for releases. The local and remote repositories are structured the same way so that scripts can easily be run on either side, or they can be synced for offline used.

In general use, the layout of the repositories is completely transparent to the Maven user, however. Maven tries to promote the notion of a user local repository where JARs, or any project artifacts, can be stored and used for any number of builds.

Many projects have dependencies such as XML parsers and standard utilities that are often replicated in typical builds. With Maven these standard utilities can be stored in your local repository and shared by any number of builds.

In general, you should not need to do anything with the local repository on a regular basis, except clean it out if you are short on disk space or erase it completely if you are willing to download everything again. For the remote repositories, they are used for both downloading and uploading bitcoin maven repository you have the permission to do so. Downloading in Maven is triggered by a project declaring a dependency that is not present in the local repository or for a SNAPSHOTwhen the remote repository contains one that is newer.

Bitcoin maven repository default, Maven will download from the central repository. To override this, you need to specify a bitcoin maven repository as shown in Using Mirrors bitcoin maven repository Repositories. You can set this in your settings. If you find that dependencies bitcoin maven repository not being found, check you bitcoin maven repository not overridden the remote repository. For more information on dependencies, see Bitcoin maven repository Mechanism.

There are several official Central repositories geographically distributed. You can make changes to your settings. Instructions for this can be found in the guide Using Mirrors for Repositories. If you are temporarily disconnected from the internet and you need to build your projects offline you can use the offline switch on the CLI:.

Note that many plugins will honour the offline setting and not perform any operations that would connect to the bitcoin maven repository. Some examples are resolving Javadoc links and link checking the site. While this is possible for any type of remote repository, you must have the permission to do so. To have someone upload to the central Maven repository, see Repository Center.

When using Maven, particularly in a corporate environment, connecting to the internet to download dependencies is not acceptable for security, speed or bandwidth reasons. For that reason, it is desirable to set up an internal repository to house a copy of artifacts, and to publish private artifacts to. Such an internal repository bitcoin maven repository be downloaded from using HTTP or the file system using a file: Note that as far as Maven is concerned, there is nothing special about this repository: Additionally, you may want to share the repository server with your generated project sites.

For more information on creating and deploying sites, see Creating a Site. To set up an internal repository just requires that you have a place to put it, and then start copying required artifacts there using the same layout as in a remote repository such as repo. It is not recommended that you scrape or rsync: You can use a program such as those described on the Repository Management page to run your internal repository's server, to download from the internet as required and then hold the artifacts in your internal repository for faster downloading later.

The other options available are to manually download and vet releases, then copy them to the internal repository, or to have Maven download them for a user, and manually bitcoin maven repository the bitcoin maven repository artifacts to the internal repository which is used for releases. This step is the only one available for artifacts where the license forbids their distribution automatically, such as several J2EE JARs provided by Sun.

It should be noted that Maven intends to include enhanced support for bitcoin maven repository features in the future, including click through licenses on downloading, and verification of signatures.

Using the bitcoin maven repository repository is quite simple. Simply make a change to add a repositories element:. If your internal repository requires authentication, the id element can be used in your settings file to specify login information. One of the most important reasons to have one or more internal repositories is to be able to publish your own private releases to share.

Connectivity is accomplished with the various wagons. Some wagons may need to be added as extension to your build. Introduction to Repositories Artifact Repositories A repository in Maven is used to hold build artifacts and dependencies of varying types. This has the following advantages: It uses less storage - while a repository is typically quite large, because each JAR is only kept in the one place it is actually saving space, even bitcoin maven repository it may not seem that way It makes checking out a project quicker - initial checkout, and to a small degree updating, a project will be faster if there are no large binary files in CVS.

While they may need to be downloaded again afterwards anyway, this only happens once and may not be necessary for some common JARs already in place. No need for versioning - CVS and other source control systems are designed for versioning files, but external dependencies typically don't change, or if they do their filename changes anyway to indicate the new version.

Storing these in CVS doesn't have any added benefit over keeping them in a local artifact cache. Using Repositories In general, you should not need to do anything with the local repository on a regular basis, except clean it out if you are short on disk space or erase it completely if you are willing to download everything again.

Downloading from a Remote Repository Downloading in Maven is triggered by a project declaring a dependency that is not present in the local repository or for a SNAPSHOTwhen the remote repository contains one that is newer.

To override this, you need to specify bitcoin maven repository mirror as shown bitcoin maven repository Using Mirrors for Repositories You can set this in your settings. Using Mirrors for the Central Repository There are several official Central repositories geographically distributed.

Building Offline If you are temporarily disconnected from the internet and you need to build your projects offline you can use bitcoin maven repository offline switch on the CLI: Uploading to a Remote Repository While this is possible for any type of remote repository, you must have the permission to do so.

Internal Repositories When using Maven, particularly in a corporate environment, connecting to the internet to download dependencies is not acceptable for security, speed or bandwidth reasons.

Setting up the Internal Repository To set up an internal repository just requires that you have a place to put it, and then start copying required artifacts there using the same layout as in a remote repository such as repo. Using the Internal Repository Using the internal repository is quite simple. Simply make a change to add a repositories element: Deploying to the Internal Repository One of the most important reasons to have one bitcoin maven repository more internal repositories is to be able to publish your own private releases to share.

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As regular readers will be aware, I do a lot of work within the Bitcoin community contributing code wherever I can.

Recently an interesting problem came up with the Bitcoinj library which has highlighted a particular weakness within Maven that I feel more developers should be aware of: Imagine that some malicious developer, Mallory, was able to gain write access to a Maven repository that you used as part of your development. Mallory knows from examining your pom.

In the case of the Bitcoinj library this could be to copy the unencrypted private keys back to his server. Mallory deletes the original artifact and replaces it with his own which has the same version number as the original but a different SHA1 and does not contain a valid signature. The short answer is that you can't. You might get lucky in that you won't download the artifact since you have a local copy of the release, but if you move to another machine then you'll be pulling down the malicious code.

By obtaining a list of known good artifacts and their SHA1 signatures it is possible to build up a list of "approved" artifacts and detect when any have changed from expectations. As long as you remain in control of your source code repository then you can be sure that your whitelist has not been tampered with.

Obviously, if Mallory got control of your source code then all bets are off. I have released a simple DigestRule for use with the Maven Enforcer Plugin to provide such a whitelist. You can choose how detailed you want it to be depending on your own security requirements, but bear in mind that every unchecked dependency is a way in for an attacker through the back door.

The configuration below shows how you would use the DigestRule in your own projects. Of course the values used below should be treated only as examples. In production you would get the list of URNs as a GPG signed configuration from the developers of the project that you were depending on. Clearly trying to manually create the list of URNs would be a painful process, particularly in a large project with many layers of transitive dependencies to explore.

Fortunately, the buildSnapshot flag will cause the plugin to examine all the resolved dependencies within your project and build a list of URNs that you can copy-paste with caution into your build. For maximum effect, the rules should be triggered during the verify phase so that all the dependencies that could affect the build will have been pulled in.

This has the useful side effect that as a developer you're not continuously checking yourself for every build - only when you're about to perform an install or deploy. You can try it out on itself by checking out the source code from GitHub:. The reactor will first build the Digest Enforcer Rules and then go on to build another artifact that depends on them working the Rule Tester project. This second project demonstrates how you would include Digest Enforcer Rules in your projects.

One of the design goals was to allow Bitcoinj to be deployed into Maven Central with sufficient support that any compromise to either it or its supporting libraries could be detected. Now your projects that include Bitcoinj will be able to build through Travis or your own equivalent once Bitcoinj arrives in Maven Central or another controlled repo. Trust has to begin somewhere so I'm going to provide some signed declarations for each version in the GitHub repo. These can be validated against my public key 59A81D7B.

Obviously, you can also compile this code yourself and obtain the same result. Why not try to verify the certificate for version 0. If you are at all concerned about dependency-chain attacks, or just want to be that little bit safer when building, then please take a look at the project and offer up some critique if it doesn't meet your standards.

The project is not tied to Bitcoinj so developers in secure environments such as research, military or government establishments may also want to consider this as an additional layer of protection to those already in place. It may even allow you to start using open source where once you were unable due to the dependency-chain risk saving your department vast amounts of money otherwise spent on validation fees.

Consider a small donation: Preventing Dependency Chain Attacks in Maven. July 3, Comments Tags:

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