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| -rw-r--r-- | doc/wiki/Upgrading.2.3.txt | 212 |
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diff --git a/doc/wiki/Upgrading.2.3.txt b/doc/wiki/Upgrading.2.3.txt new file mode 100644 index 0000000..8cda65f --- /dev/null +++ b/doc/wiki/Upgrading.2.3.txt @@ -0,0 +1,212 @@ +Upgrading Dovecot v2.2 to v2.3 +============================== + +Downgrading is possible to v2.2.27 and later. (v2.2.27 accidentally broke +dovecot.index* backwards compatibility a bit.) + +Settings Changes +---------------- + + * 'director_consistent_hashing' setting removed. It's always assumed to be + "yes" now. + * *WARNING*: You can't run a director ring with mixed + 'director_consistent_hashing' settings. If you already didn't have it set + to "yes", upgrading to v2.3 will require you to shutdown the entire + director ring. It may be safer to first do this setting change in v2.2 + before the upgrade. + * If you really don't wish to shutdown the ring, an alternative would be + to set up a whole new director ring. Then start moving users to the + new ring in the Dovecot proxy. To avoid the same user having + connections to both rings at the same time (-> two backends at the + same time), this would need to be done so that passdb moves the user + to the new ring and old connections are kicked. See + <PasswordDatabase/ExtraFields/Proxy#moving> + [PasswordDatabase.ExtraFields.Proxy.txt] + * 'director_doveadm_port' setting removed. Name the 'inet_listener doveadm { + .. }' instead. + * 'mdbox_purge_preserve_alt' setting removed. It's always assumed to be "yes" + now. + * 'recipient_delimiter' setting used to be treated as a separator string. Now + it's instead treated as a list of alternative delimiter characters. + * Time interval based settings no longer default to "seconds". All numbers + must explicitly be followed by the time unit (except 0). This is important, + because some settings now support milliseconds as well. + * fs-posix: prefix=path parameter no longer automatically appends '/' to the + path if it's not there. This allows using it properly as a prefix, instead + of only a directory prefix. Make sure you have the '/' appended to the + prefix, or the "dir/filename" will be accessed just as "dirnamename". + * 'ssl_protocols' setting was replaced by 'ssl_min_protocol'. Now you only + specify the minimum ssl protocol version Dovecot accepts, defaulting to + TLSv1. + * 'ssl_parameters' was replaced with 'ssl_dh'. See <Diffie-Hellman Parameters + for SSL> [Upgrading.2.3.txt]. + * 'SSLv2' is no longer supported in 'ssl_protocols'. + +Statistics Redesign +------------------- + +The statistics code was redesigned. + + * Statistics is no longer optional - it is always there. + * The old "stats" plugin was renamed to "old_stats". + * The "doveadm stats" command was renamed to "doveadm oldstats". + * There's a new "doveadm stats" command that isn't compatible with the old + one. + * The new stats code doesn't require a plugin, so make sure you remove 'stats' + from 'mail_plugin' setting. For more details see <Statistics.txt>. + +Config changes required to 2.2.x config to keep using the "old" stats: + + * 'mail_plugins = stats' -> 'mail_plugins = old_stats' + * 'mail_plugins = imap_stats' -> 'mail_plugins = imap_old_stats' + * 'service stats' -> 'service old-stats' + * 'executable = stats' -> 'executable = old-stats' + * 'fifo_listener stats-mail' -> 'fifo_listener old-stats-mail' + * 'fifo_listener stats-user' -> 'fifo_listener old-stats-user' + * 'unix_listener stats' -> 'unix_listener old-stats' + * 'plugin { stats_refresh }' -> 'plugin { old_stats_refresh }' + * 'plugin { stats_notify_path }' -> 'plugin { old_stats_notify_path }' + * 'plugin { stats_track_cmds }' -> 'plugin { old_stats_track_cmds }' + * 'auth_stats' -> keep as 'auth_stats' + * 'stats_*' settings -> 'old_stats_*' + +Submission Service (new) +------------------------ + +Dovecot can now act as a submission service. See <Submission.txt> for more +information. + +Localhost Auth Penalty +---------------------- + +Dovecot no longer disables auth penalty waits for clients connecting from +localhost (or 'login_trusted_networks' in general). The previous idea was that +it would likely be a webmail that would have its own delays, but there are no +guarantees about this. + +If the old behavior is still wanted, it's possible to do nowadays even more +generically with e.g. setting following as the first passdb: + +---%<------------------------------------------------------------------------- +passdb { + driver = passwd-file + args = username_format=%{rip} /etc/dovecot/passdb + default_fields = noauthenticate=y +} +---%<------------------------------------------------------------------------- + +/etc/dovecot/passdb: + +---%<------------------------------------------------------------------------- +127.0.0.1:::::::nodelay=yes +192.168.10.124:::::::nodelay=yes +---%<------------------------------------------------------------------------- + +Changed Setting Defaults +------------------------ + ++--------------------------+-----------------------------+----------------------------------------------------------------------------------------------+ +| *Setting* | *Old Default Value* | *New Default Value* | ++--------------------------+-----------------------------+----------------------------------------------------------------------------------------------+ +| 'mdbox_rotate_size' | 2M | 10M | ++--------------------------+-----------------------------+----------------------------------------------------------------------------------------------+ +| 'mailbox_list_index' | no | yes | ++--------------------------+-----------------------------+----------------------------------------------------------------------------------------------+ +| 'imap_logout_format' | n=%i out=%o | in=%i out=%o deleted=%{deleted} expunged=%{expunged} trashed=%{trashed} | +| | | hdr_count=%{fetch_hdr_count} hdr_bytes=%{fetch_hdr_bytes} body_count=%{fetch_body_count} | +| | | body_bytes=%{fetch_body_bytes} | ++--------------------------+-----------------------------+----------------------------------------------------------------------------------------------+ +| 'ssl_cipher_list' | ALL:!LOW:!SSLv2:!EXP:!aNULL | ALL:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH | ++--------------------------+-----------------------------+----------------------------------------------------------------------------------------------+ +| 'mail_log_prefix' | "%s(%u): " | "%s(%u)<%{pid}><%{session}>: " | ++--------------------------+-----------------------------+----------------------------------------------------------------------------------------------+ +| mysql: | no | yes | +| 'ssl_verify_server_cert' | | | ++--------------------------+-----------------------------+----------------------------------------------------------------------------------------------+ +| 'ssl_options' | | no_compression is now the default, and a new compression option is introduced for enabling | +| | | compression | ++--------------------------+-----------------------------+----------------------------------------------------------------------------------------------+ + +Diffie-Hellman Parameters for SSL +--------------------------------- + + * ssl-parameters.dat file is now obsolete. You should use ssl_dh setting + instead:'ssl_dh=</etc/dovecot/dh.pem' + * You can convert an existing ssl-parameters.dat to dh.pem: + + ---%<------------------------------------------------------------------- + dd if=/var/lib/dovecot/ssl-parameters.dat bs=1 skip=88 | openssl dhparam + -inform der > /etc/dovecot/dh.pem + ---%<------------------------------------------------------------------- + + * ssl-params process has also been removed, as it is no longer used to + generate these parameters. + * You are encouraged to create at least 2048 bit parameters. 4096 is industry + recommendation. + * Note that it will take LONG TIME to generate the parameters, and it should + be done with a machine that has GOOD SOURCE OF ENTROPY. Running it on a + virtual machine is not recommended, unless there is some entropy + helper/driver installed. Running this on your production proxy can starve + connections due to lack of entropy. + * Since v2.3.3+ DH parameter usage is *optional* and can be omitted. You are + invited to amend ciphers to disallow non-ECC based DH algorithms, but if you + don't and someone does try to use them, error will be emitted. + * Example: + 'ssl_cipher_list=ALL:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW:!DH@STRENGTH' + +Other Changes +------------- + + * Invalid 'postmaster_address' now causes a failure early on with + sieve/imap_sieve plugin enabled. It still defaults to 'postmaster@%d', which + expands to invalid 'postmaster@' address if your usernames do not contain a + domain, or are converted into domainless usernames by passdb/userdb. See + <DomainLost.txt>. + * Linux: Dovecot no longer enables core dumping for "setuid processes", which + most of them are. + * To enable them with Linux kernel v3.6+: Make sure core dumps get written + to a globally shared directory and enable them with:'sysctl -w + fs.suid_dumpable=2' + * With older Linux kernel versions you can set it to 1, but that's not + good for security of your system. + * You can also revert to old behavior with: 'import_environment = + $import_environment PR_SET_DUMPABLE' + * However, this also may have some security implications depending on + the setup. Mainly if you have system users and you've enabled + chrooting or mail_access_groups, this could allow the system users to + gain unintentional access. + * userdb nss was removed. Use userdb passwd instead. + * doveadm: table formatter prints the header now to stdout, not stderr + * doveadm: Removed mount commands + * OpenSSL version is required to be at least 1.0.1 for Dovecot to build + * subscriptions file is written in a new version 2 format. Dovecot v2.2.17 and + newer can read this file. + * mail_log plugin: Headers are logged as UTF-8 (instead of MIME-encoded) + * auth: When iterating users in userdb passwd, skip users that aren't in the + first/last_valid_gid range + * auth protocol has changed some error fields: + * temp -> code=temp_fail + * authz -> code=authz_fail + * user_disabled -> code=user_disabled + * pass_expired -> code=pass_expired + * auth now supports bcrypt algorithm by default. + * Some API changes have been made, if you have your own plugins please be + aware that they might require change(s) to be compatible again. + * Due to the new stats environment, for now some environments may get harmless + errors about not being able to connect to stats-writer socket. To avoid + these errors, give enough permissions for the processes to connect to the + stats-writer, for example: + +---%<------------------------------------------------------------------------- +service stats { + client_limit = 10000 # make this large enough so all Dovecot processes +(especially imap, pop3, lmtp) can connect to it + unix_listener stats-writer { + user = vmail + #mode = 0666 # Use only if nothing else works. It's a bit insecure, since +it allows any user in the system to mess up with the statistics. + } +} +---%<------------------------------------------------------------------------- + +(This file was created from the wiki on 2019-06-19 12:42) |