axTLS Embedded SSL - changes, notes and errata

changes, notes and errata

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@@bgcolor(#ff0000):color(#ffffff):Changes for 1.5.3@@\n\n!!__SSL Library__\n* Added named unions to ~SHA512 code as some compilers don't support it\n* Some other porting suggesions from Chris Ghormley\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.5.2@@\n\n!!__SSL Library__\n* ~SHA384/~SHA512 support added\n* Security issue fixed where a plain text could be injected before the handshake was completed\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.5.1@@\n\n!!__SSL Library__\n* ~SHA256 support added\n* All padding/separator bytes checked in ~RSA_decrypt()\n* Added check to get_asn1_length() to limit the number of octets and to not allow overflow\n* ~MD2 removed\n* Return code checked for get_random()\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.5.0@@\n\n!!__SSL Library__\n* Fixed array access out of bounds bug in add_cert() (thanks Ole Reinhardt)\n* Fix handling of return values of ~SOCKET_READ in process_sslv23_client_hello() (thanks Ole Reinhardt)\n* added generalized time for certificates\n* added printf changes from Fabian Frank to stop warnings/errors\n* Moved setting encryption flags to after handshake completion (thanks Eric Hu)\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.4.9@@\n\n!!__SSL Library__\n* Fixed issue where the Chrome browser could not connect. This was due to Chrome sending different version numbers in its record header and client hello. ~AxTLS has been modified to use the client hello version as part of ~RFC5246.\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.4.8@@\n\n!!__SSL Library__\n* Fixed issue where the stdint typedefs were not imported by default (stdint.h had to be included explicity) (thanks Anthony G. Basile)\n\n!!__axhttpd__\n* The password hash broke due to an over zealous buffer overflow check. \n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.4.6@@\n\n!!__SSL Library__\n* Fixed issue where the stdint typedefs were not imported by default (stdint.h had to be included explicity) (thanks Anthony G. Basile)\n* Fixed RNG initialization issue where client library was performed incorrectly (thanks Gilles Boccon~-Gibod). \n\n!!__axhttpd__\n* Now compiles properly under TCP/IP v6.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.4.5@@\n\n!!__SSL Library__\n* Fixed possible buffer overflow when doing base64 decoding (thanks Emil Kvarnhammar).\n* Fixed unicode parsing error in certificates (thanks Eric Hu)\n\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.4.4@@\n\n!!__axhttpd__\n* Allow other CGI applications (such as PHP) to call HTML files from their command line.\n\n!!__SSL Library__\n* Fixed memory leak with invalid certificates (thanks Jon Trauntvein)\n* Fixed issue with non-blocking client connections not working properly (thanks Richard Titmuss).\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.4.3@@\n\n!!__SSL Library__\n* axtlswrap compilation error fixed.\n\n!!__axhttpd__\n* added '-w' command-line option to set the webroot directory.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.4.2@@\n\n!!__SSL Library__\n* bi_export could have a buffer overrun with incorrect input (thanks Gilles ~Boccon-Gibod - 3334305)\n\n!!__axhttpd__\n* ~RFC1123 time format used in the headers.\n* Expires heading added (current time + ~CONFIG_HTTP_TIMEOUT)\n* UTC/localtime issue with ~If-Modified-Since header.\n\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.4.1@@\n\n!!__SSL Library__\n* Allow reading of ~PKCS8/12 unencrypted keys in PEM format and mconf will allow the option in server mode (thanks Steve Bennett).\n* Issue where comparing a null and an empty string could return a false positive for cert check (thanks Gilles ~Boccon-Gibod - 3310885).\n* -fPIC added as a Linux compile option.\n\n!!__axhttpd__\n* Killing connections on session timeout is guaranteed.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.4.0@@\n\n!!__SSL Library__\n* TLS v1.1 implemented and is enabled by default.\n* Closure alerts implemented correctly.\n* Fixed issue with ~SSLv23 hello versioning. \n \n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.3.4@@\n\n!!__SSL Library__\n* SSL 2.0 client hello is turned off by default as per RFC 4346 Appendix E.\n* Client determines the cipher suite selected rather than the server as per RFC 4346 7.4.1.2.\n* Guard against timing HMAC timing attacks as per RFC 4346 6.2.3.2.\n* Fixed ~SOCKET_WRITE buffer issue (thanks Hardy Griech - 3177419)\n* Fixed variable length MAC issue as used by gnutls.\n* Fixed version issue when TLS >=1.1 is used.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.3.2@@\n\n!!__SSL Library__\n* Loading of PEM certificate bundles now loads CA certs properly.\n* ssl_client_new() can now be broken up into an ssl_client_new() and successive ssl_read()'s now by setting the ~SSL_CONNECT_IN_PARTS as an option in ssl_ctx_new().\n* Non-blocked mode is now not a requirement but calls may still be blocked.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.3.1@@\n\n!!__SSL Library__\n* Certificate bundles which contain "invalid" certificates (i.e. invalid digests types etc) are ignored rather than cause failure.\n\n!!__axhttpd__\n* ~HTTPv1.0 packets close a connection upon completion.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.3.0@@\n\n!!__SSL Library__\n* Close notify is now sent as an error code from ssl_read(). Server code should be modified to check for ~SSL_CLOSE_NOTIFY (thanks to Eric Hu - 3132700).\n* regular_square() issue fixed (3078672)\n* partial_multiply() removed and merged with regular_multiply() (3078372).\n* Invalid session id size now returns ~SSL_ERROR_INVALID_SESSION (thanks to Hardy Griech - 3072881)\n* q-dash issue with Barrett reduction fixed (thanks to Hardy Griech - 3079291).\n* PEM file detection now looks for "-BEGIN" in any part of the file rather than at the start (3123838).\n* 8/16/32 bit native int sizes can be selected in configuration.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.2.7@@\n\n!!__SSL Library__\n* A fix to find_max_exp_index() (thanks to Hardy Griech).\n* Check is made to get_cipher_info() if the appropriate cipher is not found (thanks to Hardy Griech).\n* Extra x509_free() removed from do_client_connect().\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.2.5@@\n\n!!__SSL Library__\n* The custom RNG updated to use an entropy pool (with better hooks to use counters).\n\n!!__axhttpd__\n* Headers are case insensitive (thanks to Joe Pruett for this and the following).\n* Child zombie issue fixed.\n* EOF on ~POSTs fixed.\n* Expect is ignored.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.2.4@@\n\n!!__SSL Library__\n* Client renegotiation now results in an error. This is the result of a security flaw described in this paper http://extendedsubset.com/Renegotiating_TLS.pdf, and also is explained in detail here http://www.cupfighter.net/index.php/2009/11/tls-renegotiation-attack/.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.2.3@@\n\n!!__SSL Library__\n* v3 certificates with ~SANs now supports (thanks to Carsten Sørensen).\n* axtlswrap added - a port of sslwrap (thanks to Steve Bennett)\n\n!!__axhttpd__\n* shutdown() called before socket close in CGI (thanks to Tom Brown)\n* command-line parameters to specify the http/https port.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.2.2@@\n\n!!__axhttpd__\n* File uploads over 1kB (but under MAXPOSTDATASIZE) are now supported.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.2.1@@\n\n!!__SSL Library__\n* Certificate verification now works for Firefox.\n* Extended the openssl API.\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.2.0@@\n\n!!__SSL Library__\n* A self-signed certificate will be verified as ok provided that that it is on the certificate authority list.\n* Certificates are not verified when added as certificate authorities (since self-signed and expired certificates can be added to browsers etc)\n\n@@bgcolor(#ff0000):color(#ffffff):Changes for 1.1.9@@\n\n!!__SSL Library__\n* Now support MS IIS resource kit certificates (thanks to Carsten Sørensen).\n* Fixed a memory leak when freeing more than one CA certificate.\n* The bigint library had a problem with squaring which affected classical reduction (thanks to Manuel Klimek).\n\n!!__axhttpd__\n* Brought back setuid()/setgid() as an option.\n\n!@@bgcolor(#ff0000):color(#ffffff):Changes for 1.1.8@@\n\n!!__SSL Library__\n* Now using a BSD style license.\n* Self-signed certificates can now be automatically generated (the keys still need to be provided).\n* A new API call //ssl_x509_create()// can be used to programatically create the certificate.\n* Certificate/keys can be loaded automatically given a file location.\n\n!@@bgcolor(#ff0000):color(#ffffff):Changes for 1.1.7@@\n\n!!__SSL Library__\n\n* Variable sized session id's is now better handled for session caching. It has meant a new API call //ssl_get_session_id_size()// and a change to //ssl_client_new()// to define the session id size.\n* Muliple records with a single header are now better supported (thanks to Hervé Sibert).\n* ~MD2 added for Verisign root cert verification (thanks to Byron Rakitzis).\n* The ~MD5/~SHA1 digests are calculated incrementally to reduce memory (thanks to Byron Rakitzis).\n* The bigint cache is now cleared regularly to reduce memory.\n\n!!__axhttpd__\n\n* Improved the POST handling (thanks to Christian Melki).\n* CSS files now work properly.\n* Lua's CGI launcher location is configurable.\n* //vfork()// is now used for CGI for performance reasons.\n\n!@@bgcolor(#ff0000):color(#ffffff):Changes for 1.1.6@@\n\n!!__SSL Library__\n\n* ~RC4 speed improvements\n* Lua samples/bindings now work properly\n\n!@@bgcolor(#ff0000):color(#ffffff):Changes for 1.1.5@@\n\n!!__SSL Library__\n\n* Session id's can now be variable lengths in server hello messages.\n* 0 length client certificates are now supported.\n* ssl_version() now returns just the version and not the date.\n* ssl_write() was not sending complete packets under load.\n\n!!__axhttpd__\n\n* Completely updated the CGI code.\n* Lua now integrated - Lua scripts and Lua Pages now run.\n\n!@@bgcolor(#ff0000):color(#ffffff):Changes for 1.1.4@@\n\n!!__SSL Library__\n\n* Fixed a Win32 crypto library issue with non-Administrator users\n* Removed compiler warnings that showed up in ~FC6.\n* GNU TLS certificates are now accepted.\n* Separated the send/receive headers for HMAC calculations.\n* Fixed a compilation problem with swig/perl/~FC6.\n* Fixed an issue with loading PEM CA certificates.\n\n!!__axhttpd__\n\n* Made //setuid()/setgid()// call an mconf option.\n* Made //chroot()// an mconf option. Default to //chdir()// instead.\n* Removed optional permissions checking.\n\n!@@bgcolor(#ff0000):color(#ffffff):Changes for 1.1.1@@\n\n!!__SSL Library__\n\n* AES should now work on 16bit processors (there was an alignment problem).\n* Various freed objects are cleared before freeing.\n* Header files now installed in ///usr/local/include/axTLS//.\n* -DCYGWIN replaced with -~DCONFIG_PLATFORM_CYGWIN (and the same for Solaris).\n* removed "-noextern" option in Swig. Fixed some other warnings in Win32.\n* SSLCTX changed to ~SSL_CTX (to be consistent with openssl). SSLCTX still exists for backwards compatibility.\n* malloc() and friends call abort() on failure.\n* Fixed a memory leak in directory listings.\n* Added openssl() compatibility functions.\n* Fixed Cygwin 'make install' issue.\n\n!!__axhttpd__\n\n* main.c now becomes axhttpd.c.\n* Header file issue fixed (in mime_types.c).\n* //chroot()// now used for better security.\n* Basic authentication implemented (via .htpasswd).\n* SSL access/denial protection implemented (via .htaccess).\n* Directory access protection implemented (via .htaccess).\n* Can now have more than one CGI file extension in mconf.\n* "~If-Modified-Since" request now handled properly.\n* Performance tweaks to remove //ssl_find()//.

[[Read Me]]

axTLS uses a BSD style license:\n\nCopyright (c) 2008, Cameron Rich All rights reserved.\n\nRedistribution and use in source and binary forms, with or without\nmodification, are permitted provided that the following conditions are met:\n\nRedistributions of source code must retain the above copyright notice, this\nlist of conditions and the following disclaimer. Redistributions in binary\nform must reproduce the above copyright notice, this list of conditions and\nthe following disclaimer in the documentation and/or other materials\nprovided with the distribution. Neither the name of the axTLS Project nor\nthe names of its contributors may be used to endorse or promote products\nderived from this software without specific prior written permission. \n\nTHIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"\nAND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\nIMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\nARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR\nANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\nDAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR\nSERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER\nCAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\nLIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\nOUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH\nDAMAGE.

[[Read Me]] \n[[Changelog]]\n[[axhttpd]]\n[[License]]

!@@bgcolor(#ff0000):color(#ffffff):axTLS Quick Start Guide@@\n\nThis is a guide to get a small SSL web-server up and running quickly.\n\n!!__Introduction__\n\nThe axTLS project is an SSL client/server library using the ~TLSv1 protocol. It is designed to be small and fast, and is suited to embedded projects. A web server is included.\n\nThe basic web server + SSL library is around 60-70kB and is configurable for features or size.\n\n!!__Compilation__\n\nAll platforms require GNU make. This means on Win32 that Cygwin needs to be installed with "make" and various developer options selected.\n\nConfiguration now uses a tool called "mconf" which gives a nice way to configure options (similar to what is used in ~BusyBox and the Linux kernel).\n\nYou should be able to compile axTLS simply by extracting it, change into the extracted directory and typing:\n\n{{indent{{{{> make}}}\n\nSelect your platform type, save the configuration, exit, and then type "make" again.\n\nIf all goes well, you should end up with an executable called "axhttpd" (or axhttpd.exe) in the //_stage// directory.\n\nTo play with all the various axTLS options, type:\n\n{{indent{{{{> make menuconfig}}}\n\nSave the new configuration and rebuild.\n\n!!__Running it__\n\nTo run it, go to the //_stage// directory, and type (as superuser):\n\n{{indent{{{{> axhttpd}}}\n\nNote: you may have to set your ~LD_LIBRARY_PATH - e.g. go to //_stage// and type //export ~LD_LIBRARY_PATH=`pwd`//\n\nAnd then point your browser at https://127.0.0.1 And you should see a this html page with a padlock appearing on your browser. or type http://127.0.0.1 to see the same page unencrypted.\n\n!!__The axssl utilities__\n\nThe axssl suite of tools are the SSL test tools in the various language bindings. They are:\n\n* axssl - C sample\n* axssl.csharp - C# sample\n* axssl.vbnet - VB.NET sample\n* axtls.jar - Java sample\n* axssl.pl - Perl sample\n* axssl.lua - Lua sample\n\nAll the tools have identical command-line parameters. e.g. to run something interesting:\n\n{{indent{{{{> axssl s_server -verify -CAfile ../ssl/test/axTLS.ca_x509}}}\n\nand\n\n{{indent{{{{> axssl s_client -cert ../ssl/test/axTLS.x509_1024 -key ../ssl/test/axTLS.key_1024 -reconnect}}}\n\n!!!!C#\n\nIf building under Linux or other non-Win32 platforms, Mono must be installed and the executable is run as:\n\n{{indent{{{{> mono axssl.csharp.exe ...}}}\n\n!!!!Java\n\nThe java version is run as:\n\n{{indent{{{{> java -jar axtls.jar <options>}}}\n\n!!!!Perl\n\n{{indent{{{{> [perl] ./axssl.pl <options>}}}\n\nIf running under Win32, be sure to use the correct version of Perl (i.e. ~ActiveState's version works ok).\n\n!!!!Lua\n\n{{indent{{{{> [lua] ./axssl.lua <options>}}}\n\n!__Known Issues__\n\n* Firefox doesn't handle legacy ~SSLv2 at all well. Disabling ~SSLv2 still initiates a ~SSLv23 handshake (v1.5). And continuous pressing of the "Reload" page instigates a change to ~SSLv3 for some reason (even though the TLS 1.0 option is selected). This will cause a "Firefox and <server> cannot communicate securely because they have no common encryption algorithms" (v1.5), or "Firefox can't connect to <server> because the site uses a security protocol which isn't enabled" (v2.0). See bugzilla issues 343543 and 359484 (Comment #7). It's all broken (hopefully fixed soon).\n* Perl/Java bindings don't work on 64 bit Linux machines. I can't even compile the latest version of Perl on an ~AMD64 box (using ~FC3).\n* Java 1.4 or better is required for the Java interfaces.\n* Processes that fork can't use session resumption unless some form of IPC is used.\n* Ensure libperl.so and libaxtls.so are in the shared library path when running with the perl bindings. A way to do this is with:\n\n{{indent{{{{> export LD_LIBRARY_PATH=`perl -e 'use Config; print $Config{archlib};'`/CORE:.}}}\n* The lua sample requires the luabit library from http://luaforge.net/projects/bit.\n\n!!!!Win32 issues\n\n* Be careful about doing .NET executions on network drives - .NET complains with security exceptions on the binary. //TODO: Add a manifest file to prevent this.//\n* CGI has been removed from Win32 - it needs a lot more work to get it right.\n* The default Microsoft .NET SDK is v2.0.50727. Download from: http://msdn.microsoft.com/netframework/downloads/updates/default.aspx.\n\n!!!!Solaris issues\n\n* mconf doesn't work well - some manual tweaking is required for string values.\n* GNU make is required and needs to be in $PATH.\n* To get swig's library dependencies to work (and for the C library to be found), I needed to type:\n\n{{indent{{{{> export LD_LIBRARY_PATH=/usr/local/gcc-3.3.1/lib:.}}}\n\n!!!!Cygwin issues\n\n* The bindings all compile but don't run under Cygwin with the exception of Perl. This is due to win32 executables being incompatible with Cygwin libraries.\n\n

changes, notes and errata

axTLS Embedded SSL

http://axtls.cerocclub.com.au

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axhttpd is a small embedded web server using the axTLS library. It is based originally on the web server written by Doug Currie which is at http://www.hcsw.org/awhttpd.\n\n!@@bgcolor(#ff0000):color(#ffffff):axhttpd Features@@ \n\n!!__Basic Authentication__\n\nBasic Authentication uses a password file called ".htpasswd", in the directory to be protected. This file is formatted as the familiar colon-separated username/encrypted-password pair, records delimited by newlines. The protection does not carry over to subdirectories. The utility program htpasswd is included to help manually edit .htpasswd files.\n\nThe encryption of this password uses a proprietary algorithm due to the dependency of many crypt libraries on DES. An example is in [[/test_dir/no_http|https://localhost/test_dir/no_http]] (username 'abcd', password is '1234').\n\n//Note: This is an mconf enabled configuration option.//\n\n!!__SSL Protection__\n\nDirectories/files can be accessed using the 'http' or 'https' uri prefix. If normal http access for a directory needs to be disabled, then put "~SSLRequireSSL" into a '.htaccess' file in the directory to be protected. \n\nConversely, use "~SSLDenySSL" to deny access to directories via SSL.\n\nAn example is in [[/test_dir/no_http|http://localhost/test_dir/no_http]] and [[/test_dir/no_ssl|https://localhost/test_dir/no_ssl]].\n\nEntire directories can be denied access with a "Deny all" directive (regardless of SSL or authentication). An example is in [[/test_dir/bin|http://localhost/test_dir/bin]]\n\n!!__CGI__\n\nMost of the CGI 1.1 variables are now placed into the script environment and should work as normal.\n\n!!__Lua and Lua Pages__\n\nThis is a small scripting language gaining popularity in embedded applications due to its small footprint and fast speed.\n\nLua has been incorporated into the build, so simply select it and it will automatically install. Try pointing your browser at [[test_main.html|http://localhost/lua/test_main.html]] to see an example of Lua Pages.\n\n//Note: This is an mconf enabled configuration option.//\n\nThe readline development library may have to be downloaded: //yum install readline-devel//\n\n!!__Directory Listing__\n\nAn mconf option. Allow the files in directories to be displayed. An example is in [[/test_dir|http://localhost/test_dir]]\n\n!!__Other Features__\n\n* Timeout - HTTP 1.1 allows for persistent connections. This is the time allowed for this connection in seconds.\n* Daemon - Puts the process in daemon mode. \n* SSL session cache size - The size of the session cache (a heavily loaded server should maintain many sessions). A session will save on expensive SSL handshaking.\n\n