19f97fe6f1
Both at API and at CLI level (for the CMP app only, so far) there is a new parameter/option: keep_alive. * 0 means HTTP connections are not kept open after receiving a response, which is the default behavior for HTTP 1.0. * 1 means that persistent connections are requested. * 2 means that persistent connections are required, i.e., in case the server does not grant them an error occurs. For the CMP app the default value is 1, which means preferring to keep the connection open. For all other internal uses of the HTTP client (fetching an OCSP response, a cert, or a CRL) it does not matter because these operations just take one round trip. If the client application requested or required a persistent connection and this was granted by the server, it can keep the OSSL_HTTP_REQ_CTX * as long as it wants to send further requests and OSSL_HTTP_is_alive() returns nonzero, else it should call OSSL_HTTP_REQ_CTX_free() or OSSL_HTTP_close(). In case the client application keeps the OSSL_HTTP_REQ_CTX * but the connection then dies for any reason at the server side, it will notice this obtaining an I/O error when trying to send the next request. This requires extending the HTTP header parsing and rearranging the high-level HTTP client API. In particular: * Split the monolithic OSSL_HTTP_transfer() into OSSL_HTTP_open(), OSSL_HTTP_set_request(), a lean OSSL_HTTP_transfer(), and OSSL_HTTP_close(). * Split the timeout functionality accordingly and improve default behavior. * Extract part of OSSL_HTTP_REQ_CTX_new() to OSSL_HTTP_REQ_CTX_set_expected(). * Extend struct ossl_http_req_ctx_st accordingly. Use the new feature for the CMP client, which requires extending related transaction management of CMP client and test server. Update the documentation and extend the tests accordingly. Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/15053)
Welcome to the OpenSSL Project
OpenSSL is a robust, commercial-grade, full-featured Open Source Toolkit for the Transport Layer Security (TLS) protocol formerly known as the Secure Sockets Layer (SSL) protocol. The protocol implementation is based on a full-strength general purpose cryptographic library, which can also be used stand-alone.
OpenSSL is descended from the SSLeay library developed by Eric A. Young and Tim J. Hudson.
The official Home Page of the OpenSSL Project is www.openssl.org.
Table of Contents
Overview
The OpenSSL toolkit includes:
-
libssl an implementation of all TLS protocol versions up to TLSv1.3 (RFC 8446).
-
libcrypto a full-strength general purpose cryptographic library. It constitutes the basis of the TLS implementation, but can also be used independently.
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openssl the OpenSSL command line tool, a swiss army knife for cryptographic tasks, testing and analyzing. It can be used for
- creation of key parameters
- creation of X.509 certificates, CSRs and CRLs
- calculation of message digests
- encryption and decryption
- SSL/TLS client and server tests
- handling of S/MIME signed or encrypted mail
- and more...
Download
For Production Use
Source code tarballs of the official releases can be downloaded from www.openssl.org/source. The OpenSSL project does not distribute the toolkit in binary form.
However, for a large variety of operating systems precompiled versions of the OpenSSL toolkit are available. In particular on Linux and other Unix operating systems it is normally recommended to link against the precompiled shared libraries provided by the distributor or vendor.
For Testing and Development
Although testing and development could in theory also be done using the source tarballs, having a local copy of the git repository with the entire project history gives you much more insight into the code base.
The official OpenSSL Git Repository is located at git.openssl.org. There is a GitHub mirror of the repository at github.com/openssl/openssl, which is updated automatically from the former on every commit.
A local copy of the Git Repository can be obtained by cloning it from the original OpenSSL repository using
git clone git://git.openssl.org/openssl.git
or from the GitHub mirror using
git clone https://github.com/openssl/openssl.git
If you intend to contribute to OpenSSL, either to fix bugs or contribute new features, you need to fork the OpenSSL repository openssl/openssl on GitHub and clone your public fork instead.
git clone https://github.com/yourname/openssl.git
This is necessary, because all development of OpenSSL nowadays is done via GitHub pull requests. For more details, see Contributing.
Build and Install
After obtaining the Source, have a look at the INSTALL file for detailed instructions about building and installing OpenSSL. For some platforms, the installation instructions are amended by a platform specific document.
- Notes for UNIX-like platforms
- Notes for Android platforms
- Notes for Windows platforms
- Notes for the DOS platform with DJGPP
- Notes for the OpenVMS platform
- Notes on Perl
- Notes on Valgrind
Specific notes on upgrading to OpenSSL 3.0 from previous versions, as well as known issues are available on the OpenSSL 3.0 Wiki page.
Documentation
Manual Pages
The manual pages for the master branch and all current stable releases are available online.
Wiki
There is a Wiki at wiki.openssl.org which is currently not very active. It contains a lot of useful information, not all of which is up to date.
License
OpenSSL is licensed under the Apache License 2.0, which means that you are free to get and use it for commercial and non-commercial purposes as long as you fulfill its conditions.
See the LICENSE.txt file for more details.
Support
There are various ways to get in touch. The correct channel depends on your requirement. see the SUPPORT file for more details.
Contributing
If you are interested and willing to contribute to the OpenSSL project, please take a look at the CONTRIBUTING file.
Legalities
A number of nations restrict the use or export of cryptography. If you are potentially subject to such restrictions you should seek legal advice before attempting to develop or distribute cryptographic code.
Copyright
Copyright (c) 1998-2021 The OpenSSL Project
Copyright (c) 1995-1998 Eric A. Young, Tim J. Hudson
All rights reserved.