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108 lines
4.8 KiB
Plaintext
108 lines
4.8 KiB
Plaintext
SYNOPSIS
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This Apache module provides strong cryptography for the Apache 2 webserver
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via the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS
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v1) protocols by the help of the SSL/TLS implementation library OpenSSL which
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is based on SSLeay from Eric A. Young and Tim J. Hudson.
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The mod_ssl package was created in April 1998 by Ralf S. Engelschall
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and was originally derived from software developed by Ben Laurie for
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use in the Apache-SSL HTTP server project. The mod_ssl implementation
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for Apache 1.3 continues to be supported by the modssl project
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<http://www.modssl.org/>.
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SOURCES
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See the top-level LAYOUT file in httpd-2.1 for file descriptions.
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The source files are written in clean ANSI C and pass the ``gcc -O -g
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-ggdb3 -Wall -Wshadow -Wpointer-arith -Wcast-align -Wmissing-prototypes
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-Wmissing-declarations -Wnested-externs -Winline'' compiler test
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(assuming `gcc' is GCC 2.95.2 or newer) without any complains. When
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you make changes or additions make sure the source still passes this
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compiler test.
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FUNCTIONS
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Inside the source code you will be confronted with the following types of
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functions which can be identified by their prefixes:
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ap_xxxx() ............... Apache API function
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ssl_xxxx() .............. mod_ssl function
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SSL_xxxx() .............. OpenSSL function (SSL library)
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OpenSSL_xxxx() .......... OpenSSL function (SSL library)
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X509_xxxx() ............. OpenSSL function (Crypto library)
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PEM_xxxx() .............. OpenSSL function (Crypto library)
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EVP_xxxx() .............. OpenSSL function (Crypto library)
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RSA_xxxx() .............. OpenSSL function (Crypto library)
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DATA STRUCTURES
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Inside the source code you will be confronted with the following
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data structures:
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server_rec .............. Apache (Virtual) Server
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conn_rec ................ Apache Connection
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request_rec ............. Apache Request
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SSLModConfig ............ mod_ssl (Global) Module Configuration
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SSLSrvConfig ............ mod_ssl (Virtual) Server Configuration
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SSLDirConfig ............ mod_ssl Directory Configuration
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SSLConnConfig ........... mod_ssl Connection Configuration
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SSLFilterRec ............ mod_ssl Filter Context
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SSL_CTX ................. OpenSSL Context
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SSL_METHOD .............. OpenSSL Protocol Method
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SSL_CIPHER .............. OpenSSL Cipher
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SSL_SESSION ............. OpenSSL Session
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SSL ..................... OpenSSL Connection
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BIO ..................... OpenSSL Connection Buffer
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For an overview how these are related and chained together have a look at the
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page in README.dsov.{fig,ps}. It contains overview diagrams for those data
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structures. It's designed for DIN A4 paper size, but you can easily generate
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a smaller version inside XFig by specifing a magnification on the Export
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panel.
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INCOMPATIBILITIES
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The following intentional incompatibilities exist between mod_ssl 2.x
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from Apache 1.3 and this mod_ssl version for Apache 2:
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o The complete EAPI-based SSL_VENDOR stuff was removed.
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o The complete EAPI-based SSL_COMPAT stuff was removed.
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o The <IfDefine> variable MOD_SSL is no longer provided automatically
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MAJOR CHANGES
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For a complete history of changes for Apache 2 mod_ssl, see the
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CHANGES file in the top-level httpd-2.1 directory. The following
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is a condensed summary of the major changes were made between
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mod_ssl 2.x from Apache 1.3 and this mod_ssl version for Apache 2:
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o The DBM based session cache is now based on APR's DBM API only.
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o The shared memory based session cache is now based on APR's APIs.
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o SSL I/O is now implemented in terms of filters rather than BUFF
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o Eliminated ap_global_ctx. Storing Persistant information in
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process_rec->pool->user_data. The ssl_pphrase_Handle_CB() and
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ssl_config_global_* () functions have an extra parameter now -
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"server_rec *" - which is used to retrieve the SSLModConfigRec.
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o Properly support restarts, allowing mod_ssl to be added to a server
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that is already running and to change server certs/keys on restart
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o Various performance enhancements
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o proxy support is no longer an "extension", much of the mod_ssl core
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was re-written (ssl_engine_{init,kernel,config}.c) to be generic so
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it could be re-used in proxy mode.
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- the optional function ssl_proxy_enable is provide for mod_proxy
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to enable proxy support
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- proxy support now requires 'SSLProxyEngine on' to be configured
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- proxy now supports SSLProxyCARevocation{Path,File} in addition to
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the original SSLProxy* directives
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o per-directory SSLCACertificate{File,Path} is now thread-safe but
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requires SSL_set_cert_store patch to OpenSSL
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o RSA sslc is supported via ssl_toolkit_compat.h
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o the ssl_engine_{ds,ext}.c source files are obsolete and no longer
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exist
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TODO
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See the top-level STATUS file in httpd-2.1 for current efforts and goals.
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