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OpenConnect VPN client

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# Changelog

For full changelog entries including the latest development, see gitweb.

- OpenConnect HEAD
  - No changelog entries yet
- OpenConnect v5.03 (PGP signature) — 2014-02-03
  - Fix crash on `--authenticate` due to freeing `--cafile` option in `argv`.
- OpenConnect v5.02 (PGP signature) — 2014-01-01
  - Fix XML POST issues with authgroups by falling back to old style login.
  - Fix `--cookie-on-stdin` with cookies from ocserv.
  - Fix reconnection to wrong host after redirect.
  - Reduce limit of queued packets on DTLS socket, to fix VoIP latency.
  - Fix Solaris build breakage due to missing `<string.h>` includes.
  - Include path in `<group-access>` node.
  - Include supporting CA certificates from PKCS#11 tokens (with GnuTLS 3.2.7+).
  - Fix possible heap overflow if MTU is increased on reconnection (CVE-2013-7098).
- OpenConnect v5.01 (PGP signature) — 2013-06-01
  - Attempt to handle `<client-cert-request>` in aggregate auth mode.
  - Don't include `X-Aggregate-Auth:` header in fallback mode.
  - Enable AES256 mode for DTLS with GnuTLS (RH#955710).
  - Add `--dump-http-traffic` option for debugging.
  - Be more permissive in parsing XML forms.
  - Use original URL when falling back to non-XML POST mode.
  - Add `--no-xmlpost` option to revert to older, compatible behaviour.
  - Close connection before falling back to non-xmlpost mode (RH#964650).
  - Improve error handling when server closes connection (Debian #708928).
- OpenConnect v5.00 (PGP signature) — 2013-05-15
  - Use GnuTLS by default instead of OpenSSL.
  - Avoid using deprecated `gnutls_pubkey_verify_data()` function.
  - Fix compatibility issues with XML POST authentication.
  - Fix memory leaks on `realloc()` failure.
  - Fix certificate validation problem caused by hostname canonicalisation.
  - Add RFC6238 TOTP token support using liboath.
  - Replace `--stoken` option with more generic `--token-mode` and `--token-secret` options.
- OpenConnect v4.99 (PGP signature) — 2013-02-07
  - Add `--os` switch to report a different OS type to the gateway.
  - Support new XML POST format.
  - Add SecurID token support using libstoken.
- OpenConnect v4.08 (PGP signature) — 2013-02-13
  - Fix overflow on HTTP request buffers (CVE-2012-6128)
  - Fix connection to servers with round-robin DNS with two-stage auth/connect.
  - Impose minimum MTU of 1280 bytes.
  - Fix some harmless issues reported by Coverity.
  - Improve `"Attempting to connect..."` message to be explicit when it's connecting to a proxy.
- OpenConnect v4.07 (PGP signature) — 2012-08-31
  - Fix segmentation fault when invoked with `-p` argument.
  - Fix handling of write stalls on CSTP (TCP) socket.
- OpenConnect v4.06 (PGP signature) — 2012-07-23
  - Fix default CA location for non-Fedora systems with old GnuTLS.
  - Improve error handing when `vpnc-script` exits with error.
  - Handle PKCS#11 tokens which won't list keys without login.
- OpenConnect v4.05 (PGP signature) — 2012-07-12
  - Use correct CSD script for Mac OS X.
  - Fix endless loop in PIN cache handling with multiple PKCS#11 tokens.
  - Fix PKCS#11 URI handling to preserve all attributes.
  - Don't forget key password on GUI reconnect.
  - Fix GnuTLS v3 build on OpenBSD.
- OpenConnect v4.04 (PGP signature) — 2012-07-05
  - Fix GnuTLS password handling for PKCS#8 files.
- OpenConnect v4.03 (PGP signature) — 2012-07-02
  - Fix `--no-proxy` option.
  - Fix handling of requested vs. received MTU settings.
  - Fix DTLS MTU for GnuTLS 3.0.21 and newer.
  - Support more ciphers for OpenSSL encrypted PEM keys, with GnuTLS.
  - Fix GnuTLS compatibilty issue with servers that insist on TLSv1.0 or non-AES ciphers (RH#836558).
- OpenConnect v4.02 (PGP signature) — 2012-06-28
  - Fix build failure due to unconditional inclusion of `<gnutls/dtls.h>`.
- OpenConnect v4.01 (PGP signature) — 2012-06-28
  - Fix DTLS MTU issue with GnuTLS.
  - Fix reconnect crash when compression is disabled.
  - Fix build on systems like FreeBSD 8 without `O_CLOEXEC`.
  - Add `--dtls-local-port` option.
  - Print correct error when `/dev/net/tun` cannot be opened.
  - Fix `openconnect.pc` pkg-config file not to require `zlib.pc` on systems which lack it (like RHEL5).
- OpenConnect v4.00 (PGP signature) — 2012-06-20
  - Add support for OpenSSL's odd encrypted PKCS#1 files, for GnuTLS.
  - Fix repeated passphrase retry for OpenSSL.
  - Add keystore support for Android.
  - Support TPM, and also additional checks on PKCS#11 certs, even with GnuTLS 2.12.
  - Fix library references to OpenSSL's `ERR_print_errors_cb()` when built against GnuTLS v2.12.
- OpenConnect v3.99 (PGP signature) — 2012-06-13
  - Enable native TPM support when built with GnuTLS.
  - Enable PKCS#11 token support when built with GnuTLS.
  - Eliminate all SSL library exposure through `libopenconnect`.
  - Parse split DNS information, provide `$CISCO_SPLIT_DNS` environment variable to `vpnc-script`.
  - Attempt to provide new-style MTU information to server (on Linux only, unless specified on command line).
  - Allow building against GnuTLS, including DTLS support.
  - Add `--with-pkgconfigdir=` option to `configure` for FreeBSD's benefit (fd#48743).
- OpenConnect v3.20 (PGP signature) — 2012-05-18
  - Cope with non-keepalive HTTP response on authentication success.
  - Fix progress callback with incorrect `cbdata` which caused KDE crash.
- OpenConnect v3.19 (PGP signature) — 2012-05-17
  - Add `--config` option for reading options from file.
  - Improve OpenSSL DTLS compatibility to work on Ubuntu 10.04.
  - Flush progress logging output promptly after each message.
  - Add symbol versioning for shared library (on sane platforms).
  - Add `openconnect_set_cancel_fd()` function to allow clean cancellation.
  - Fix corruption of URL in `openconnect_parse_url()` if it specifies a port number.
  - Fix inappropriate `exit()` calls from library code.
  - Library namespace cleanup — all symbols now have the prefix `openconnect_` on platforms where symbol versioning works.
  - Fix `--non-inter` option so it still uses login information from command line.
- OpenConnect v3.18 (PGP signature) — 2012-04-25
  - Fix autohate breakage with `--disable-nls`... hopefully.
  - Fix buffer overflow in banner handling.
- OpenConnect v3.17 (PGP signature) — 2012-04-20
  - Work around `time()` brokenness on Solaris.
  - Fix interface plumbing on Solaris 10.
  - Provide `asprintf()` function for (unpatched) Solaris 10.
  - Make `vpnc-script` mandatory, like it is for `vpnc`
  - Don't set Legacy IP address on tun device; let `vpnc-script` do it.
  - Detect OpenSSL even without pkg-config.
  - Stop building static library by default.
  - Invoke `vpnc-script` with "pre-init" reason to load tun module if necessary.
- OpenConnect v3.16 (PGP signature) — 2012-04-08
  - Fix build failure on Debian/kFreeBSD and Hurd.
  - Fix memory leak of deflated packets.
  - Fix memory leak of zlib state on CSTP reconnect.
  - Eliminate `memcpy()` calls on packets from DTLS and tunnel device.
  - Use `I_LINK` instead of `I_PLINK` on Solaris to plumb interface for Legacy IP.
  - Plumb interface for IPv6 on Solaris, instead of expecting `vpnc-script` to do it.
  - Refer to vpnc-script and help web pages in openconnect output.
  - Fix potential crash when processing libproxy results.
  - Be more conservative in detecting libproxy without pkg-config.
- OpenConnect v3.15 (PGP signature) — 2011-11-25
  - Fix for reading multiple packets from Solaris tun device.
  - Call `bindtextdomain()` to ensure that translations are found in install path.
- OpenConnect v3.14 (PGP signature) — 2011-11-08
  - Move executable to `$prefix/sbin`.
  - Fix build issues on OSX, OpenIndiana, DragonFlyBSD, OpenBSD, FreeBSD & NetBSD.
  - Fix non-portable `(void *)` arithmetic.
  - Make more messages translatable.
  - Attempt to make NLS support more portable (with fewer dependencies).
- OpenConnect v3.13 (PGP signature) — 2011-09-30
  - Add `--cert-expire-warning` option.
  - Give visible warning when server dislikes client SSL certificate.
  - Add localisation support.
  - Fix build on Debian systems where `dtls1_stop_timer()` is not available.
  - Fix libproxy detection.
  - Enable a useful set of compiler warnings by default.
  - Fix various minor compiler warnings.
- OpenConnect v3.12 — 2011-09-12
  - Fix DTLS compatibility with ASA firmware 8.4.1(11) and above.
  - Fix build failures on GNU Hurd, on systems with ancient OpenSSL, and on Debian.
  - Add `--pid-file` option.
  - Print SHA1 fingerprint with server certificate details.
- OpenConnect v3.11 — 2011-07-20
  - Add `Android.mk` file for Android build support
  - Add logging support for Android, in place of standard `syslog()`.
  - Switch back to using TLSv1, but without extensions.
  - Make TPM support optional, dependent on OpenSSL ENGINE support.
- OpenConnect v3.10 — 2011-06-30
  - Switch to using GNU autoconf/automake/libtool.
  - Produce shared library for authentication.
  - Improve library API to make life easier for C++ users.
  - Be more explicit about requiring `pkg-config`.
  - Invoke script with `reason=reconnect` on CSTP reconnect.
  - Add `--non-inter` option to avoid all user input.
- OpenConnect v3.02 — 2011-04-19
  - Install man page in `make install` target.
  - Add `openconnect_vpninfo_free()` to libopenconnect.
  - Clear cached `peer_addr` to avoid reconnecting to wrong host.
- OpenConnect v3.01 — 2011-03-09
  - Add libxml2 to pkg-config requirements.
- OpenConnect v3.00 — 2011-03-09
  - Create libopenconnect.a for GUI authentication dialog to use.
  - Remove auth-dialog, which now lives in the network-manager-openconnect package.
  - Cope with more entries in authentication forms.
  - Add `--csd-wrapper` option to wrap CSD trojan.
  - Report error and abort if CA file cannot be opened.
- OpenConnect v2.26 — 2010-09-22
  - Fix potential crash on relative HTTP redirect.
  - Use correct TUN/TAP device node on Android.
  - Check client certificate expiry date.
  - Implement CSTP and DTLS rekeying (both by reconnecting CSTP).
  - Add `--force-dpd` option to set minimum DPD interval.
  - Don't print `webvpn` cookie in debug output.
  - Fix host selection in NetworkManager auth dialog.
  - Use SSLv3 instead of TLSv1; some servers (or their firewalls) don't accept any `ClientHello` options.
  - Never include address family prefix on `script-tun` connections.
- OpenConnect v2.25 — 2010-05-15
  - Always validate server certificate, even when no extra `--cafile` is provided.
  - Add `--no-cert-check` option to avoid certificate validation.
  - Check server hostname against its certificate.
  - Provide text-mode function for reviewing and accepting "invalid" certificates.
  - Fix libproxy detection on NetBSD.
- OpenConnect v2.24 — 2010-05-07
  - Forget preconfigured password after a single attempt; don't retry infinitely if it's failing.
  - Set `$CISCO_BANNER` environment variable when running script.
  - Better handling of passphrase failure on certificate files.
  - Fix NetBSD build (thanks to Pouya D. Tafti).
  - Fix DragonFly BSD build.
- OpenConnect v2.23 — 2010-04-09
  - Support "Cisco Secure Desktop" trojan in NetworkManager auth-dialog.
  - Support proxy in NetworkManager auth-dialog.
  - Add `--no-http-keepalive` option to work around Cisco's incompetence.
  - Fix build on Debian/kFreeBSD.
  - Fix crash on receiving HTTP 404 error.
  - Improve workaround for server certificates lacking SSL_SERVER purpose, so that it also works with OpenSSL older than 0.9.8k.
- OpenConnect v2.22 — 2010-03-07
  - Fix bug handling port numbers above 9999.
  - Ignore "`Connection: Keep-Alive`" in HTTP/1.0 to work around server bug with certificate authentication.
  - Handle non-standard port (and full URLs) when used with NetworkManager.
  - Cope with relative redirect and form URLs.
  - Allocate HTTP receive buffer dynamically, to cope with arbitrary size of content.
  - Fix server cert SHA1 comparison to be case-insensitive.
  - Fix build on Solaris and OSX (`strndup()`, `AI_NUMERICSERV`).
  - Fix exit code with `--background` option.
- OpenConnect v2.21 — 2010-01-10
  - Fix handling of HTTP 1.0 responses with keepalive (RH#553817).
  - Fix case sensitivity in HTTP headers and hostname comparison on redirect.
- OpenConnect v2.20 — 2010-01-04
  - Fix use-after-free bug in NetworkManager authentication dialog (RH#551665).
  - Allow server to be specified with `https://` URL, including port and pathname (which Cisco calls 'UserGroup')
  - Support connection through HTTP and SOCKS proxies.
  - Handle HTTP redirection with port numbers.
  - Handle HTTP redirection with IPv6 literal addresses.
- OpenConnect v2.12 — 2009-12-07
  - Fix buffer overflow when generating useragent string.
  - Cope with idiotic schizoDNS configurations by not repeating DNS lookup for VPN server on reconnects.
  - Support DragonFlyBSD. Probably.
- OpenConnect v2.11 — 2009-11-17
  - Add IPv6 support for FreeBSD.
  - Support "split tunnel" mode for IPv6 routing.
  - Fix bug where client certificate's MD5 was only given to the CSD trojan if a PKCS#12 certificate was used.
- OpenConnect v2.10 — 2009-11-04
  - OpenSolaris support.
  - Preliminary support for IPv6 connectivity.
  - Fix session shutdown on exit.
  - Fix reconnection when TCP connection is closed.
  - Support for "Cisco Secure Desktop" idiocy.
  - Allow `User-Agent:` to be specified on command line.
  - Fix session termination on disconnect.
  - Fix recognition of certificates from OpenSSL 1.0.0.
- OpenConnect v2.01 — 2009-06-24
  - Fix bug causing loss of DTLS (and lots of syslog spam about it) after a CSTP reconnection.
  - Don't apply OpenSSL certificate chain workaround if we already have "extra" certificates loaded (e.g. from a PKCS#12 file).
  - Load "extra" certificates from `.pem` files too.
  - Fix SEGV caused by freeing certificates after processing cert chain.
- OpenConnect v2.00 — 2009-06-03
  - Add OpenBSD and FreeBSD support.
  - Build with OpenSSL-0.9.7 (Mac OS X, OpenBSD, etc.)
  - Support PKCS#12 certificates.
  - Automatic detection of certificate type (PKCS#12, PEM, TPM).
  - Work around OpenSSL trust chain issues (RT#1942).
  - Allow PEM passphrase to be specified on command line.
  - Allow PEM passphrase automatically generated from the `fsid` of the file system on which the certificate is stored.
  - Fix certificate comparisons (in NM auth-dialog and `--servercert` option) to use SHA1 fingerprint, not signature.
  - Fix segfault in NM auth-dialog when changing hosts.
- OpenConnect v1.40 — 2009-05-27
  - Fix validation of server's SSL certificate when NetworkManager runs openconnect as an unprivileged user (which can't read the real user's trust chain file).
  - Fix double-free of DTLS Cipher option on reconnect.
  - Reconnect on SSL write errors
  - Fix reporting of SSL errors through syslog/UI.
- OpenConnect v1.30 — 2009-05-13
  - NetworkManager auth-dialog will now cache authentication form options.
- OpenConnect v1.20 — 2009-05-08
  - DTLS cipher choice fixes.
  - Improve handling of authentication group selection.
  - Export more information to connection script.
  - Add `--background` option to dæmonize after connection.
  - Detect TCP connection closure.
- OpenConnect v1.10 — 2009-04-01
  - NetworkManager UI rewrite with many improvements.
  - Support for "UserGroups" where a single server offers multiple configurations according to the URL used to connect.
- OpenConnect v1.00 — 2009-03-18
  - First non-beta release.