UnrealIRCd 4.0.16 released

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Hi everyone,

UnrealIRCd 4.0.16 (stable) is now available for download. This release
consists of a huge amount of enhancements and other changes.

Thanks to everyone who previously tested the release candidate.

*Changes between version 4.0.15 and 4.0.16
*Improvements

  * There's now an easy method to remove spamfilters. '/SPAMFILTER del'
    will show a list of spamfilters along with the appropriate command
    to remove them (by id).
  * CAP v3.2 support.
  * CAP 'cap-notify': notify users of any CAP changes.
  * CAP 'extended-join': show account and gecos in JOIN.
  * CAP 'chghost': notify on user/host changes. Note that if you use
    set::allow-userhost-change force-rejoin then clients which support
    CAP 'chghost' will not see the PART+JOIN+MODE sequence as it is
    unnecessary. They already receive a "CHGHOST" message as part of CAP
    'chghost' instead.
  * Updated CAP 'sasl' to specification 3.2 (includes mechlist).
  * Automatically discover SASL server if saslmechlist is sent by
    services and set::sasl-server is not set by the administrator. This
    should help to get more networks to support SASL automatically (if
    you run up to date services, of course)
  * We send "CAP DEL sasl" if set::sasl-server squits and a "CAP NEW"
    message when the server returns (to cap-notify and CAPv3.2 clients).
  * Added password::type 'spkifp'. It's similar to 'sslclientcertfp' but
    is a hash based on the public TLS key rather than the certificate.
    The benefit of this is that the 'spkifp' can stay the same even if
    you get a new certificate from Let's Encrypt. Note that 'certbot'
    does not re-use keys by default so you will still get a different
    spkifp every 60-90 days. Consider using another (3rd party) client
    or tell the certbot guys to finally implement --reuse-key at
    https://github.com/certbot/certbot/issues/3788
  * The command './unrealircd spkifp' will output the SPKI fingerprint
    (this is now used in the updated Linking servers tutorial
    <https://www.unrealircd.org/docs/Tutorial:_Linking_servers>)
  * New option set::handshake-delay will delay the handshake (when a
    user is connecting) up to this amount of time.
  * If you have any blacklist { } block then UnrealIRCd will set an
    set::handshake-delay of 2 seconds by default. This will allow (most)
    DNSBL checking to be finished before the user comes online (and thus
    get bad users killed before they appear), while still allowing a
    smooth user experience. If your DNS(BL) is slow then you could raise
    this setting slightly.
  * You can now have multiple webirc { } blocks with the same mask. This
    permits multiple blocks like..
    webirc {  
        mask *;
        password "....." { sslclientcertfp; };
    };
    ..should you need it. In other words: we don't stop matching upon an
    authentication failure.
  * Move CONNECTTIMEOUT to set::handshake-timeout
    <https://www.unrealircd.org/docs/Set_block#set::handshake-timeout>.
  * Move MAXUNKNOWNCONNECTIONSPERIP to
    set::max-unknown-connections-per-ip
    <https://www.unrealircd.org/docs/Set_block#set::max-unknown-connections-per-ip>.
  * Add set { cloak-method ip; }; which will make cloaking only be done
    on the IP and thus result in an XX.YY.ZZ.IP cloaked host.
    This so you can have "IP cloaking" without disabling DNS lookups.
    GLINES on hosts still work and IRCOps (and yourself) can still see
    the host in /WHOIS.
  * New option set { ban-include-username yes; }; which will make bans
    placed by spamfilters (and some other systems) to be placed not on
    *@ip but on user@ip. Note that this won't work for ZLINE/GZLINE
    since no no ident/username lookups are done in such cases.

Major issues fixed

  * None

Minor issues fixed

  * Gracefully handle incorrect server-to-server messages. These no
    longer cause UnrealIRCd to crash. Note that this does not mean you
    can now go send random RAW messages from a trusted server
    connection. Doing so can cause desynchs, KILLs and SQUITs. We just
    try not to crash anymore.
  * A small memory leak upon 'DNS i' (IRCOp only command)

*Removed*

  * Various old config.h settings that didn't have any effect.
  * A few config.h settings that should never be turned off have been
    removed altogether (eg: NO_FLOOD_AWAY is now always on).
  * The deprecated and unused commands "CAP CLEAR" and "CAP ACK".

*Other changes
*

  * When linking servers and not having any certificate validation,
    UnrealIRCd will give you specific instructions on how to use
    password::spkifp or verify-certificate. This to fix a possible
    Man-in-the-Middle attack. Note that you'll only see this message
    when linking two servers that are 4.0.16+.
  * When a user does a nick change from a registered nick you will now
    see the user mode -r. Previously this happened invisibly.
  * The default oper snomask now includes 'S' (spamfilter notices).

*For module coders*

  * API change for HOOKTYPE_PRE_INVITE:
    int hook_pre_invite(aClient *sptr, aClient *target, aChannel *chptr,
    int *override)
    Modules must now send the error message instead of only returning
    HOOK_DENY. Also check for operoverride and set *override=1.
  * Please use the following procedure in case of an user/host change:
    userhost_save_current(acptr);
    /* now do what you need to do: like change username or hostname */
    userhost_changed(acptr);
    This function will take care of notifying other clients about the
    userhost change, such as doing PART+JOIN+MODE if force-rejoin is
    enabled, and sending :xx CHGHOST user host messages to "CAP chghost"
    capable clients.

*For services coders:*

  * If you provide SASL then please send the mechlist like this:
    MD client your.services.server saslmechlist :EXTERNAL,PLAIN
  * Don't forget to send an EOS (End Of Synch) at the end of the
    handshake, if you are not doing so already. It's important:
    :your.services.server EOS

*Download*
As always, you can download UnrealIRCd from https://www.unrealircd.org/
All releases are signed with our PGP key (key id 0xA7A21B0A108FF4A9)

*Bug reports and feature enhancements
*Please report all bugs and feature suggestions at
https://bugs.unrealircd.org/
Our GitHub repository is available on
https://github.com/unrealircd/unrealircd/

-- 
Bram Matthys
Security researcher                     sy...@vu...
Website:                                  www.vulnscan.org
PGP key:                       www.vulnscan.org/pubkey.asc
PGP fp: EBCA 8977 FCA6 0AB0 6EDB  04A7 6E67 6D45 7FE1 99A6