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NEWS
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v2.4.0 2025-01-24 Aki Tuomi <[email protected]>
* config: dovecot_config_version must be the first non-comment
line in configuration file.
* config: dovecot_storage_version must be in the configuration
file.
* config: Many configuration options have changed so old configuration
files do not work without rewrite. See
https://doc.dovecot.org/main/installation/upgrade/2.3-to-2.4.html
* config: New variable expansion syntax has been introduced, see
https://doc.dovecot.org/main/core/settings/variables.html
* config: Some default settings have changed.
* config: plugin {} section has been removed.
* *-login: With ssl=required, connections from login_trusted_networks
are now also required to be SSL/TLS encrypted.
* acl: Use ACL settings instead of Global ACL Directories.
* auth-worker: auth_worker_max_count is replaced with
service auth-worker { process_limit }.
* auth: Weak password schemes are disabled by default, use
auth_allow_weak_schemes to enable them.
* auth_debug, mail_debug: Use log_debug filter instead.
* config: All sections require a name, for example passdb/userdb:
passdb static {
password=secret
}
* db2: Remove Berkeley DB support.
* dict-memcached: This is removed, use Redis instead.
* director: Feature has been removed. See potential replacement at
https://github.com/dovecot/tools/blob/main/director.lua
* doveadm: USER environment variable is only supported with
--no-userdb-lookup. One of -u, -F or -A must be used
otherwise.
* doveconf: Option -n is now default when running doveconf.
* dsync: Use doveadm sync instead, legacy symlink has been removed.
* fs-sis: Feature is now deprecated and has been made read-only.
It will be removed in future release.
* fts-lucene, fts-squat: These have been removed, use fts-flatcurve or
fts-solr instead.
* imap-login: IMAP compression is now handled in proxies.
* imap_quota: SETQUOTA / quota_set has been removed.
* imap_zlib: This plugin is no longer needed, it's always enabled.
* imapc: All features are enabled by default, imapc_features can be used
to explicitly disable features that are not wanted.
* lib-storage: mbox driver is now frozen.
* mail_compress: XZ and LZMA algorithm support has been removed.
* mailbox-alias: Plugin has been removed.
* old_stats, auth_stats: These have been removed.
* openssl: Minimum supported version of OpenSSL is now 1.1.1.
* openssl: Add support for OpenSSL 3.x
* quota-dict, quota-dirsize: These have been removed, use quota-count
instead. You can use quota_clone to copy quota usage to some database.
* replicator: Feature has been removed. Use NFS or some other shared
filesystem instead, or run doveadm sync in crontab.
* stats: The bytes_in and bytes_out field in several events have been
renamed as net_in_bytes and net_out_bytes.
* zlib: Renamed to mail_compress plugin.
+ Experimental SMTPUTF8 and IMAP UTF8=ACCEPT support has been added.
Needs --enable-experimental-mail-utf8 configure option and
mail_utf8_extensions=yes setting.
+ Long running mail commands can be aborted with Ctrl-C / doveadm kick.
+ auth: LDAP driver now supports multi-value attributes.
+ auth: Add support for SCRAM-SHA-1-PLUS and SCRAM-SHA-256-PLUS.
+ auth: Add support for TLS channel binding.
+ auth: Support sending JA3 hash to policy server.
+ configure: Detect latest Lua version.
+ *-login: Support for TLS Server Name has been improved to allow pre-login
settings. For example capabilities to be changed based on TLS Server Name.
+ *-login: Support for TLS ALPN has been added, connections with mismatching
application are now refused. Missing ALPN is accepted.
+ fts-flatcurve: New Xapian based FTS plugin has been added.
+ imap: Support for INPROGRESS untagged messages as per RFC 9585.
+ lib-lua: Expose Dovecot DNS client.
+ lib-lua: Expose Dovecot HTTP client.
+ lib-sasl: Support SCRAM-SHA mechanisms.
+ lmtp: SNI support has been added which allows settings to be applied
based on TLS Server Name.
+ sqlite: Support WAL mode.
+ stats: Submetric name size has been increased.
+ submission: Add submission_add_received_header setting to protect
sender identity by suppressing the Received: header.
- Many bugs have been fixed.
v2.3.21.1 2024-08-14 Aki Tuomi< [email protected]>
- CVE-2024-23184: A large number of address headers in email resulted
in excessive CPU usage.
- CVE-2024-23185: Abnormally large email headers are now truncated or
discarded, with a limit of 10MB on a single header and 50MB for all
the headers of all the parts of an email.
- oauth2: Dovecot would send client_id and client_secret as POST parameters
to introspection server. These need to be optionally in Basic auth
instead as required by OIDC specification.
- oauth2: JWT key type check was too strict.
- oauth2: JWT token audience was not validated against client_id as
required by OIDC specification.
- oauth2: XOAUTH2 and OAUTHBEARER mechanisms were not giving out
protocol specific error message on all errors. This broke OIDC discovery.
- oauth2: JWT aud validation was not performed if aud was missing
from token, but was configured on Dovecot.
v2.3.21 2023-09-15 Aki Tuomi <[email protected]>
* lib-oauth2: Allow JWT tokens to be validated with missing typ field.
The typ field is left out by some key issuers to conserve space,
notably kubernetes. Now missing typ is tolerated, but if present, it
still must be "jwt".
+ auth: Auth passdb and userdb reply can contain "event_<name>=value"
which will be added to login event and mail user event respectively.
+ lib-master: Set process title during various initialization stages to
clearly describe what the process is waiting on.
+ lib-storage: The mail_temp_scan_interval is now fuzzed incrementing it
by 0..30% based on username's hash to reduce the chance of load spikes.
+ lib-storage: The temp file scan has been moved from the open of the
mailbox to the close, to reduce the latency perceived by users.
+ stats: If metric has fields specified, all these fields are
exported as counters to prometheus exposition.
See https://doc.dovecot.org/configuration_manual/stats/openmetrics/.
- *-login: Processes might have crashed when a SSL connection disconnects
uncleanly.
- acl: When plugin was loaded \HasChildren and \HasNoChildren flags
were calculated incorrectly for mailboxes containing '*' and '%'
in their names.
- auth: Crash occured if a connection to PostgreSQL database server
failed during startup.
- auth: Logins with invalid passwords (e.g. unknown scheme) in passdb
were failing with "password mismatch" instead of "internal error".
- auth: XOAUTH2 and OAUTHBEARER mechanisms were not giving out protocol
specific error message on all errors. This especially broke OIDC
discovery.
- dbox: When last_temp_file_scan header wasn't set (especially after
dsync migration), the next mailbox open always triggers the temp file
scan. This could have caused a load spike after migrations. Fixed by
using the mailbox directory's atime when the header isn't set, which
usually moves the scan time into the future.
- dict-redis: A crash would occur on transaction rollback.
- dsync: Infinite loop causing out of memory would occur when handling
mailbox deletion from remote end and hierarchy separators would differ.
- dsync: Incremental dsync failed for folder names ending with '%',
unless BROKENCHAR was set. Also folder names with '%' elsewhere in
them caused each incremental dsync to unnecessarily rename the folder
to a temporary name and back. v2.3.19 regression.
- imap-hibernate: If an IMAP client unhibernation timed out with
"(version received)", the unhibernation could still have successfully
finished later on and continued working normally. This was rather
confusing, because imap-hibernate already logged that the client got
disconnected. Avoid this by forcing the connection to shutdown on
unhibernation timeout.
- imapc: Crashed when a folder mapped through the virtual plugin
disappears from the storage.
- imapc: EXPUNGE, EXISTS or FETCH replies from a server for a previously
selected mailbox could have been processed as if they belonged to the
new mailbox currently being selected. This could have caused warnings.
- lib-http: Dovecot HTTP server (doveadm, stats/openmetrics) may have
disconnected HTTP clients before the response is fully sent. This
happened only on busy servers where kernel's socket buffers were
rather full.
- lib-http: Fixed a potential crash on http-server if a client
disconnected early. v2.3.18 regression.
- lib-index: Index file corruption could have caused a crash. Fixes:
Panic: file mail-transaction-log-view.c: line 165 (mail_transaction_log_view_set):
assertion failed: (min_file_seq <= max_file_seq).
- lib-index: Purging an existing >1GB cache file can crash. Now cache
files still above 1GB after purging are removed. Fixes:
Panic: file mail-index-util.c: line 10 (mail_index_uint32_to_offset):
assertion failed: (offset < 0x40000000)
- lib-lua: A HTTP client could not resolve DNS names in mail processes,
because it expected "the dns-client" socket to exist in the current
directory.
- lib-oauth2: Dovecot would send client_id and client_secret as POST
parameters to the introspection server. These need to be optionally in
Basic auth instead.
- lib-oauth2: JWT aud validation was not performed if aud was missing
from a token, but was configured on Dovecot.
- lib-oauth2: JWT key type check was too strict.
- lib-oauth2: JWT token audience was not validated against client_id as
required by the specification.
- lib-ssl-iostream: Using the ssl_require_crl=yes setting may have caused
CRL check failures for outgoing SSL/TLS connections, although it was
supposed to affect checking CRLs only for client-side SSL
certificates. v2.3.17 regression.
- lib-sql: MySQL driver leaked memory when connection failed.
- lib-storage: Various fixes when running into out of disk space.
- master: Service idle_kill setting didn't work properly on busy
servers. It was very unlikely that any process was idling long enough
to become killed. Also the idle_kill handling code was using quite a
lot of CPU on the master process when there were a lot of processes
(e.g. imap). The new behavior is to track the lowest number of idling
processes every idle_kill time interval and then kill that many idling
processes.
- mdbox: Temp file scan was done for always empty directories.
- mdbox: The fdatasync() call was done in wrong parent directory when
writing mails. Also on a failure it crashed instead of logging an error.
- notify_status: The plugin crashes if any user initialization fails.
- pop3: Sending command with the ':' character caused an assert-crash.
v2.3.18 regression. Fixes: Panic: event_reason_code_prefix(): name has ':'
- stats: Fix panic when a nonexistent event exporter was referenced while
adding a new metric dynamically via doveadm stats add. This produces
a proper error now.
- stats: If process exported a lot of events and then exited, some of
the last events may have become lost.
- stats: Invalid Prometheus label names were created with specific
histogram group_by configurations. Prometheus rejected these labels.
- welcome: The plugin didn't execute in some situations that created
INBOX but didn't open it, e.g. if GETMETADATA was used before the
INBOX was opened.
v2.3.20 2022-12-22 Aki Tuomi <[email protected]>
+ Add dsync_features=no-header-hashes. When this setting is enabled and
one dsync side doesn't support mail GUIDs (i.e. imapc), there is no
fallback to using header hashes. Instead, dsync assumes that all mails
with identical IMAP UIDs contains the same mail contents. This can
significantly improve dsync performance with some IMAP servers that
don't support caching Date/Message-ID headers.
+ lua: HTTP client has more settings now, see
https://doc.dovecot.org/admin_manual/lua/#dovecot.http.client
+ replicator: "doveadm replicator status" command now outputs when the
next sync is expected for the user.
- LAYOUT=index: duplicate GUIDs were not cleaned out. Also the list
recovery was not optimal.
- auth: Assert crash would occur when iterating multiple userdb
backends.
- director: Logging into director using master user with
auth_master_user_separator character redirected user to a wrong
backend, unless master_user_separator setting was also set to the same
value. Merged these into auth_master_user_separator.
- dsync: Couldn't always fix folder GUID conflicts automatically with
Maildir format. This resulted in replication repeatedly failing
with "Remote lost mailbox GUID".
- dsync: Failed to migrate INBOX when using namespace prefix=INBOX/,
resulting in "Remote lost mailbox GUID" errors.
- dsync: INBOX was created too early with namespace prefix=INBOX/,
resulting a GUID conflict. This may have been resolved automatically,
but not always.
- dsync: v2.3.18 regression: Wrong imapc password with dsync caused
Panic: file lib-event.c: line 506 (event_pop_global):
assertion failed: (event == current_global_event)
- imapc: Requesting STATUS for a mailbox with imapc and INDEXPVT
configured did not return correct (private) unseen counts.
- lib-dict: Process would crash when committing data to redis without
dict proxy.
- lib-mail: Corrupted cached BODYSTRUCTURE caused panic during FETCH.
Fixes: Panic: file message-part-data.c: line 579 (message_part_is_attachment):
assertion failed: (data != NULL). v2.3.13 regression.
- lib-storage: mail_attribute_dict with dict-sql failed when it tried to
lookup empty dict keys.
- lib: ioloop-kqueue was missing include breaking some BSD builds.
- lua-http: Dovecot Lua HTTP client could not resolve DNS names in mail
processes, because it expected "dns-client" socket to exist in the
current directory.
- oauth2: Using %{oauth2:name} variables could cause useless
introspections.
- pop3: Sending POP3 command with ':' character caused an assert-crash.
v2.3.18 regression.
- replicator: Replication queue had various issues, potentially causing
replication requests to become stuck.
- stats: Invalid Prometheus label names were created with specific
histogram group_by configurations. Prometheus rejected these labels.
v2.3.19.1 2022-06-14 Aki Tuomi <[email protected]>
- doveadm deduplicate: Non-duplicate mails were deleted.
v2.3.19 regression.
- auth: Crash would occur when iterating multiple backends.
Fixes: Panic: file userdb-blocking.c:
line 125 (userdb_blocking_iter_next): assertion failed: (ctx->conn != NULL)
v2.3.19 2022-05-10 Aki Tuomi <[email protected]>
+ Added mail_user_session_finished event, which is emitted when the mail
user session is finished (e.g. imap, pop3, lmtp). It also includes
fields with some process statistics information.
See https://doc.dovecot.org/admin_manual/list_of_events/ for more
information.
+ Added process_shutdown_filter setting. When an event matches the filter,
the process will be shutdown after the current connection(s) have
finished. This is intended to reduce memory usage of long-running imap
processes that keep a lot of memory allocated instead of freeing it to
the OS.
+ auth: Add cache hit indicator to auth passdb/userdb finished events.
See https://doc.dovecot.org/admin_manual/list_of_events/ for more
information.
+ doveadm deduplicate: Performance is improved significantly.
+ imapc: COPY commands were sent one mail at a time to the remote IMAP
server. Now the copying is buffered, so multiple mails can be copied
with a single COPY command.
+ lib-lua: Add a Lua interface to Dovecot's HTTP client library. See
https://doc.dovecot.org/admin_manual/lua/ for more information.
- auth: Cache lookup would use incorrect cache key after username change.
- auth: Improve handling unexpected LDAP connection errors/hangs.
Try to fix up these cases by reconnecting to the LDAP server and
aborting LDAP requests earlier.
- auth: Process crashed if userdb iteration was attempted while auth-workers
were already full handling auth requests.
- auth: db-oauth2: Using %{oauth2:name} variables caused unnecessary
introspection requests.
- dict: Timeouts may have been leaked at deinit.
- director: Ring may have become unstable if a backend's tag was changed.
It could also have caused director process to crash.
- doveadm kick: Numeric parameter was treated as IP address.
- doveadm: Proxying can panic when flushing print output. Fixes
Panic: file ioloop.c: line 865 (io_loop_destroy): assertion failed:
(ioloop == current_ioloop).
- doveadm sync: BROKENCHAR was wrongly changed to '_' character when
migrating mailboxes. This was set by default to %, so any mailbox
names containing % characters were modified to "_25".
- imapc: Copying or moving mails with doveadm to an imapc mailbox could
have produced "Error: Syncing mailbox '[...]' failed" Errors. The
operation itself succeeded but attempting to sync the destination
mailbox failed.
- imapc: Prevent index log synchronization errors when two or more imapc
sessions are adding messages to the same mailbox index files, i.e.
INDEX=MEMORY is not used.
- indexer: Process was slowly leaking memory for each indexing request.
- lib-fts: fts header filters caused binary content to be sent to the
indexer with non-default configuration.
- doveadm-server: Process could hang in some situations when printing
output to TCP client, e.g. when printing doveadm sync state.
- lib-index: dovecot.index.log files were often read and parsed entirely,
rather than only the parts that were actually necessary. This mainly
increased CPU usage.
- lmtp-proxy: Session ID forwarding would cause same session IDs being
used when delivering same mail to multiple backends.
- log: Log prefix update may have been lost if log process was busy.
This could have caused log prefixes to be empty or in some cases
reused between sessions, i.e. log lines could have been logged for the
wrong user/session.
- mail_crypt: Plugin crashes if it's loaded only for some users. Fixes
Panic: Module context mail_crypt_user_module missing.
- mail_crypt: When LMTP was delivering mails to both recipients with mail
encryption enabled and not enabled, the non-encrypted recipients may
have gotten mails encrypted anyway. This happened when the first
recipient was encrypted (mail_crypt_save_version=2) and the 2nd
recipient was not encrypted (mail_crypt_save_version=0).
- pop3: Session would crash if empty line was sent.
- stats: HTTP server leaked memory.
- submission-login: Long credentials, such as OAUTH2 tokens, were refused
during SASL interactive due to submission server applying line length
limits.
- submission-login: When proxying to remote host, authentication was not
using interactive SASL when logging in using long credentials such as
OAUTH2 tokens. This caused authentication to fail due to line length
constraints in SMTP protocol.
- submission: Terminating the client connection with QUIT command after
mail transaction is started with MAIL command and before it is
finished with DATA/BDAT can cause a segfault crash.
- virtual: doveadm search queries with mailbox-guid as the only parameter
crashes: Panic: file virtual-search.c: line 77 (virtual_search_get_records):
assertion failed: (result != 0)
v2.3.18 2022-02-03 Aki Tuomi <[email protected]>
* Removed mail_cache_lookup_finished event. This event wasn't especially
useful, but it increased CPU usage significantly.
* fts: Don't index inline base64 encoded content in FTS indexes using
the generic tokenizer. This reduces the FTS index sizes by removing
input that is very unlikely to be searched for. See
https://doc.dovecot.org/configuration_manual/fts/tokenization for
details on how base64 is detected. Only applies when using libfts.
* lmtp: Session IDs are now preserved through proxied connections, so
LMTP sessions can be tracked. This slightly changes the LMTP session
ID format by appending ":Tn" (transaction), ":Pn" (proxy connection)
and ":Rn" (recipient) counters after the session ID prefix.
+ Events now have "reason_code" field, which can provide a list of
reasons why the event is happening. See
https://doc.dovecot.org/admin_manual/event_reasons/
+ New events are added. See https://doc.dovecot.org/admin_manual/list_of_events/
+ fts: Added fts_header_excludes and fts_header_includes settings to
specify which headers to index. See
https://doc.dovecot.org/settings/plugin/fts-plugin#plugin-fts-setting-fts-header-excludes
for configuration details.
+ fts: Initialize the textcat language detection library only once per
process. This can reduce CPU usage if fts_languages setting has multiple
languages listed and service indexer-worker { service_count } isn't 1.
Only applies when using libfts.
+ lib-storage: Reduced CPU usage significantly for some operations that
accessed lots of emails (e.g. fetching all flags in a folder, SORT, ...)
+ lib: DOVECOT_PREREQ() - Add micro version which enables compiling
external plugins against different versions of Dovecot.
+ lmtp: Added new lmtp_verbose_replies setting that makes errors sent to
the LMTP client much more verbose with details about why exactly
backend proxy connections or commands are failing.
+ submission: Support implicit SASL EXTERNAL with
submission_client_workarounds=implicit-auth-external. This allows
automatically logging in when SSL client certificate is present.
- *-login: Statistics were disabled if stats process connection was lost.
- auth: Authentication master user login fails with SCRAM-* SASL mechanisms.
- auth: With auth_cache_verify_password_with_worker=yes, passdb extra
fields in the auth cache got lost.
- doveadm: Fixed crash if zlib_save_level setting was specified,
but zlib_save was unset. v2.3.15 regression.
- doveadm: Proxying can panic when flushing print output. v2.3.17
regression. Fixes:
Panic: file ioloop.c: line 865 (io_loop_destroy): assertion failed:
(ioloop == current_ioloop)
- doveadm: stats add --group-by parameter didn't work.
- fts: Using email-address fts tokenizer could result in excessive memory
usage with garbage email input. This could cause the indexer-worker
processes to fail due to reaching the VSZ memory size limit.
Only applies when using libfts.
- imap: A SEARCH command timing out while fts returns indexes may timeout
returning "NO [SERVERBUG]", while it should return "NO [INUSE]" instead.
- imap: LIST-EXTENDED doesn't return STATUS for all folders. Sending
LIST .. RETURN (SUBSCRIBED STATUS (...)) did not return STATUS for
folders that are not subscribed when they have a child folder that is
subscribed as mandated by IMAP RFCs.
- imapc: Mailbox vsize calculation crashed with
Panic: file index-mailbox-size.c: line 344 (index_mailbox_vsize_hdr_add_missing):
assertion failed: (mails_left > 0)
- indexer: If indexer-worker crashes, the request it was processing gets
stuck in the indexer process. This stops indexing for the folder until
indexer process is restarted. v2.3.14 regression.
- indexer: Process was slowly leaking memory for each indexing request.
- lib-event: Unnamed events were wrongly filtered out for event/metric
filters like "event=abc OR something_independent_of_event_name".
- lib-index: 64-bit big endian CPUs handle last_used field in
dovecot.index.cache wrong.
- lib-ssl-iostream: Fix buggy OpenSSL error handling without assert-crashing.
If there is no error available, log it as an error instead of crashing.
The previous fix for this in v2.3.11 was incomplete. Fixes
Panic: file istream-openssl.c: line 51 (i_stream_ssl_read_real):
assertion failed: (errno != 0)
- lmtp: Out-of-memory issues can happen when proxying large messages to
LMTP backend servers that accept the message data too slow.
- master: HAProxy header parsing has read buffer overflow if provided
header size is invalid. This happens only if inet_listener
{ haproxy=yes } is configured and only if the remote IP address is in
haproxy_trusted_networks.
- old_stats: Plugin kept increasing memory usage, which became
noticeable with long-running imap sessions.
- stats: Dynamically adding same metric multiple times causes multiple stats.
- submission-login: Authentication does not accept OAUTH2 token (or
other very long credentials) because it considers the line to be too long.
- submission-login: Process can crash if HELO is pipelined with an
invalid domain.
- submission-proxy: Don't use SASL-IR if it would make the AUTH command
line longer than 512 bytes.
- submission: Service would crash if relay server authentication failed.
- virtual: FTS search in a virtual folder could crash if there are
duplicate mailbox GUIDs. This mainly happened when user had both INBOX
and INBOX/INBOX folders and the namespace prefix was INBOX/. Fixes
Panic: file hash.c: line 252 (hash_table_insert_node):
assertion failed: (opcode == HASH_TABLE_OP_UPDATE)
- virtual: If mailbox opening fails, the backend mailbox is leaked and
process crashes when client disconnects. Fixes
Panic: file mail-user.c: line 232 (mail_user_deinit):
assertion failed: ((*user)->refcount == 1)
- virtual: Searching headers in virtual folders didn't always use
full-text search indexes, if fts_enforced=no or body.
v2.3.17.1 2021-12-07 Aki Tuomi <[email protected]>
- dsync: Add back accidentically removed parameters.
- lib-ssl-iostream: Fix assert-crash when OpenSSL returned syscall error
without errno.
- master: Dovecot failed to start if ssl_ca was too large.
v2.3.17 2021-10-28 Aki Tuomi <[email protected]>
* Dovecot now logs a warning if time seems to jump forward at least
100 milliseconds.
* dict: Lines logged by the dict process now contain the dict name as
the prefix.
* lib-index: mail_cache_fields, mail_always_cache_fields and
mail_never_cache_fields now verifies that the listed header names are
valid. Especially the UTF8 "–" character has sometimes been wrongly
used instead of the ASCII "-".
+ *-login: Added login_proxy_rawlog_dir setting to capture
rawlogs between proxy and backend.
+ dict: The server process now keeps the last 10 idle dict backends
cached for maximum of 30 seconds. Practically this acts as a
connection pool for dict-redis and dict-ldap. Note that this doesn't
affect dict-sql, because it already had its own internal cache.
+ doveadm: New stats add/remove commands added to support changing the
metrics configuration on runtime.
+ lazy_expunge: Added lazy_expunge_exclude settings to disable
lazy_expunge for specific folders. \Special-use flags can be used as
folder names.
+ lib-lua: Added a new helper function dovecot.restrict_global_variables()
to disable or enable defining new global variables.
- LAYOUT=index List index rebuild was missing.
- LAYOUT=index: Duplicate GUIDs were not detected.
- acl: When using acl_ignore_namespace Dovecot attempted to access or
create dovecot-acl-list even when the namespace should have been
ignored. For virtual namespaces this could have yielded errors about
"Read-only file system" or "Permission denied".
- auth: Setting the "master" passdb field to empty value would
cause proxying to fail with an authentication error.
Now an empty "master" field is ignored.
- doveadm-server: Duplicate error lines were sent for failed commands.
This didn't normally cause visible problems, except when using
wildcards in usernames or -A parameter to go through multiple users.
- doveadm-server: Logs written by doveadm-server were often missing log
prefixes, especially mail_log_prefix for mail commands. Logs sent to
doveadm TCP client were also missing log prefixes.
- doveadm: v2.3 regression: batch command always crashes.
- doveadm: v2.3.11 regression: Commands failed if ssl_cert or
ssl_key files weren't readable by the user running doveadm, even
though doveadm didn't actually use these settings
- imap-hibernate: Process may crash at deinit:
Panic: file ioloop.c: line 928 (io_loop_destroy): assertion failed:
(ioloop->cur_ctx == NULL).
- imap: Using imap_fetch_failure=no-after can cause assert-crash
with some IMAP commands if reading the mail fails (e.g. wrong cached
mail size). Fixes:
Panic: file index-mail-headers.c: line 198 (index_mail_parse_header_init):
assertion failed: (!mail->data.header_parser_initialized)
- imap: v2.3.10 regression: When using INDEXPVT to enable private
\Seen flags (for shared or public namespaces) the STORE command did
not send untagged replies for the \Seen flag changes.
- imap: v2.3.15 regression: If PREVIEW/SNIPPET is not the final FETCH
option in the command, the IMAP FETCH response is broken.
- imap: v2.3.15 regression: MOVE command leaks mailbox if it can't be
opened and crashes at deinit:
Panic: file mail-user.c: line 229 (mail_user_deinit): assertion failed:
((*user)->refcount == 1).
- imapc: Copying nonexistent mail via imapc could have crashed. Fixes:
Panic: file mail-storage.c: line 2385 (mailbox_transaction_commit_get_changes):
assertion failed: (ret < 0 || seq_range_count(&changes_r->saved_uids) == save_count ||
array_count(&changes_r->saved_uids) == 0).
- indexer: v2.3.15 regression: Process crashes if indexer-client
disconnects while it's waiting for command reply. This happened for
example if IMAP SEARCH triggered long fts indexing and the IMAP
client disconnected while waiting for the reply.
- indexer: v2.3.15 regression: Process may have crashed in some situations.
- indexer: v2.3.15 regression: indexer-worker processes may not have
reached the process_limit in some situations, possibly even using just
one indexer-worker process even though there were many indexing
requests queued.
- lib-compression: Reading lz4 compressed mdbox mails may crash. Fixes:
Panic: file istream.c: line 345 (i_stream_read_memarea):
assertion failed: (!stream->blocking).
- lib-compression: bench-compress crashes due to xz being read-only.
- lib-lua: Fix linking libdict_lua for non-GNU linkers when Lua support
is disabled.
- lib-mail: There was no limit on how large an email header name could be.
Processable header names are now limited to 1000 bytes.
- lib-oauth2: Dovecot disallowed JWT tokens if their validity time was
older than token creation time (nbf < iat).
- lib-storage: Reduce memory footprint of certain storage operations.
- lib-storage: When listing mailboxes with storage name escape
characters (^ or .) as part of the mailbox name, the listing could
show corrupted mailbox names. Due to an issue in handling escaped
parent folders, the listing of other mailbox names would become
corrupted by prepending parts of the previously listed mailboxes
parent folder as prefix to the actual mailbox names. The corruption
can occur when using LAYOUT=INDEX and maildir or obox, or when using
the listescape plugin.
- mail-crypt: Fix "-O" argument for "doveadm mailbox cryptokey password"
command to be a boolean, and not expect a string.
- submission-login: Add support for not authenticating to next hop in
submission proxying.
- submission-login: EHLO was not sent again after XCLIENT when doing
submission proxying.
- virtual: Mailboxes do not correctly detect underlying mailboxes
getting re-created even though they have a different UIDVALIDITY or
GUID.
v2.3.16 2021-08-06 Timo Sirainen <[email protected]>
* Any unexpected exit() will now result in a core dump. This can
especially help notice problems when a Lua script causes exit(0).
* auth-worker process is now restarted when the number of auth
requests reaches service auth-worker { service_count }. The default
is still unlimited.
+ Event improvements: Added data_stack_grow event and http-client
category. See https://doc.dovecot.org/admin_manual/list_of_events/
+ oauth2: Support RFC 7628 openid-configuration element. This allows
clients to support OAUTH2 for any server, not just a few hardcoded
servers like they do now. See openid_configuration_url setting in
dovecot-oauth2.conf.ext.
+ mysql: Single statements are no longer enclosed with BEGIN/COMMIT.
+ dovecot-sysreport --core supports multiple core files now and does
not require specifying the binary path.
+ imapc: When imap_acl plugin is loaded and imapc_features=acl is used,
IMAP ACL commands are proxied to the remote server. See
https://doc.dovecot.org/configuration_manual/mail_location/imapc/
+ dict-sql now supports the "UPSERT" syntax for SQLite and PostgreSQL.
+ imap: If IMAP client disconnects during a COPY command, the copying
is aborted, and changes are reverted. This may help to avoid many
email duplicates if client disconnects during COPY and retries it
after reconnecting.
- master process was using 100% CPU if service attempted to create more
processes due to process_min_avail, but process_limit was already
reached. v2.3.15 regression.
- Using attachment detection flags wrongly logged unnecessary "Failed
to add attachment keywords" errors. v2.3.13 regression.
- IMAP QRESYNC: Expunging UID 1 mail resulted in broken VANISHED
response, which could have confused IMAP clients. v2.3.13 regression.
- imap: STORE didn't send untagged replies for \Seen changes for
(shared) mailboxes using INDEXPVT. v2.3.10 regression.
- rawlog_dir setting would not log input that was pipelined after
authentication command.
- Fixed potential infinite looping with autoexpunging.
- Log event exporter: Truncate long fields to 1000 bytes
- LAYOUT=index: ACL inheritance didn't work when creating mailboxes
- Event filters: Unquoted '?' wildcard caused a crash at startup
- fs-metawrap: Fix to handling zero sized files
- imap-hibernate: Fixed potential crash at deinit.
- acl: dovecot-acl-list files were written for acl_ignore_namespaces
- program-client (used by Sieve extprograms, director_flush_socket)
may have missed status response from UNIX and network sockets,
resulting in unexpected failures.
v2.3.15 2021-06-21 Aki Tuomi <[email protected]>
* CVE-2021-29157: Dovecot does not correctly escape kid and azp fields in
JWT tokens. This may be used to supply attacker controlled keys to
validate tokens, if attacker has local access.
* CVE-2021-33515: On-path attacker could have injected plaintext commands
before STARTTLS negotiation that would be executed after STARTTLS
finished with the client.
* Disconnection log messages are now more standardized across services.
They also always now start with "Disconnected" prefix.
* Dovecot now depends on libsystemd for systemd integration.
* Removed support for Lua 5.2. Use version 5.1 or 5.3 instead.
* config: Some settings are now marked as "hidden". It's discouraged to
change these settings. They will no longer be visible in doveconf
output, except if they have been changed or if doveconf -s parameter
is used. See https://doc.dovecot.org/settings/advanced/ for details.
* imap-compress: Compression level is now algorithm specific.
See https://doc.dovecot.org/settings/plugin/compress-plugin/
* indexer-worker: Convert "Indexed" info logs to an event named
"indexer_worker_indexing_finished". See
https://doc.dovecot.org/admin_manual/list_of_events/#indexer-worker-indexing-finished
+ Add TSLv1.3 support to min_protocols.
+ Allow configuring ssl_cipher_suites. (for TLSv1.3+)
+ acl: Add acl_ignore_namespace setting which allows to entirely ignore
ACLs for the listed namespaces.
+ imap: Support official RFC8970 preview/snippet syntax. Old methods of
retrieving preview information via IMAP commands ("SNIPPET and PREVIEW
with explicit algorithm selection") have been deprecated.
+ imapc: Support INDEXPVT for imapc storage to enable private
message flags for cluster wide shared mailboxes.
+ lib-storage: Add new events: mail_opened, mail_expunge_requested,
mail_expunged, mail_cache_lookup_finished. See
https://doc.dovecot.org/admin_manual/list_of_events/#mail
+ zlib, imap-compression, fs-compress: Support compression levels that
the algorithm supports. Before, we would allow hardcoded value between
1 to 9 and would default to 6. Now we allow using per-algorithm value
range and default to whatever default the algorithm specifies.
- *-login: Commands pipelined together with and just after the authenticate
command cause these commands to be executed twice. This applies to all
protocols that involve user login, which currently comprises of imap,
pop3, submisision and managesieve.
- *-login: Processes are supposed to disconnect the oldest non-logged in
connection when process_limit was reached. This didn't actually happen
with the default "high-security mode" (with service_count=1) where each
connection is handled by a separate process.
- *-login: When login process reaches client/process limits, oldest
client connections are disconnected. If one of these was still doing
anvil lookup, this caused a crash. This could happen only if the login
process limits were very low or if the server was overloaded.
- Fixed building with link time optimizations (-flto).
- auth: Userdb iteration with passwd driver does not always return all
users with some nss drivers.
- dsync: Shared INBOX not synced when "mail_shared_explicit_inbox" was
disabled. If a user has a shared mailbox which is another user's INBOX,
dsync didn't include the mailbox in syncing unless explicit naming is
enabled with "mail_shared_explicit_inbox" set to "yes".
- dsync: Shared namespaces were not synced with "-n" flag.
- dsync: Syncing shared INBOX failed if mail_attribute_dict was not set.
If a user has a shared mailbox that is another user's INBOX, dsync
failed to export the mailbox if mail attributes are disabled.
- fts-solr, fts-tika: Using both Solr FTS and Tika may have caused HTTP
requests to assert-crash: Panic: file http-client-request.c: line 1232
(http_client_request_send_more): assertion failed: (req->payload_input != NULL)
- fts-tika: 5xx errors returned by Tika server as indexing failures.
However, Tika can return 5xx for some attachments every time.
So the 5xx error should be retried once, but treated as success if it
happens on the retry as well. v2.3 regression.
- fts-tika: v2.3.11 regression: Indexing messages with fts-tika may have
resulted in Panic: file message-parser.c: line 802 (message_parser_deinit_from_parts):
assertion failed: (ctx->nested_parts_count == 0 || i_stream_have_bytes_left(ctx->input))
- imap: SETMETADATA could not be used to unset metadata values.
Instead NIL was handled as a "NIL" string. v2.3.14 regression.
- imap: IMAP BINARY FETCH crashes at least on empty base64 body:
Panic: file index-mail-binary.c: line 358 (blocks_count_lines):
assertion failed: (block_count == 0 || block_idx+1 == block_count)
- imap: If IMAP client using the NOTIFY command was disconnected while
sending FETCH notifications to the client, imap could crash with
Panic: Trying to close mailbox INBOX with open transactions.
- imap: Using IMAP COMPRESS extension can cause IMAP connection to hang
when IMAP commands are >8 kB long.
- imapc: If remote server sent BYE but didn't immediately disconnect, it
could cause infinite busy-loop.
- lib-index: Corrupted cache record size in dovecot.index.cache file
could have caused a crash (segfault) when accessing it.
- lib-oauth2: JWT token time validation now works correctly with
32-bit systems.
- lib-ssl-iostream: Checking hostnames against an SSL certificate was
case-sensitive.
- lib-storage: Corrupted mime.parts in dovecot.index.cache may have
resulted in Panic: file imap-bodystructure.c: line 206 (part_write_body):
assertion failed: (text == ((part->flags & MESSAGE_PART_FLAG_TEXT) != 0))
- lib-storage: Index rebuilding (e.g. via doveadm force-resync) didn't
preserve the "hdr-pop3-uidl" header. Because of this, the next pop3
session could have accessed all of the emails' metadata to read their
POP3 UIDL (opening dbox files).
- listescape: When using the listescape plugin and a shared namespace
the plugin didn't work properly anymore resulting in errors like:
"Invalid mailbox name: Name must not have '/' character."
- lmtp: Connection crashes if connection gets disconnected due to
multiple bad commands and the last bad command is BDAT.
- lmtp: The Dovecot-specific LMTP parameter XRCPTFORWARD was blindly
forwarded by LMTP proxy without checking that the backend has support.
This caused a command parameter error from the backend if it was
running an older Dovecot release. This could only occur in more complex
setups where the message was proxied twice; when the proxy generated
the XRCPTFORWARD parameter itself the problem did not occur, so this
only happened when it was forwarded.
- lmtp: The LMTP proxy crashes with a panic when the remote server
replies with an error while the mail is still being forwarded through
a DATA/BDAT command.
- lmtp: Username may have been missing from lmtp log line prefixes when
it was performing autoexpunging.
- master: Dovecot would incorrectly fail with haproxy 2.0.14 service
checks.
- master: Systemd service: Dovecot announces readiness for accepting
connections earlier than it should. The following environment variables
are now imported automatically and can be omitted from
import_environment setting: NOTIFY_SOCKET LISTEN_FDS LISTEN_PID.
- master: service { process_min_avail } was launching processes too
slowly when master was forking a lot of processes.
- util: Make the health-check.sh example script POSIX shell compatible.
v2.3.14.1 2021-06-21 Aki Tuomi <[email protected]>
* CVE-2021-29157: Dovecot does not correctly escape kid and azp fields in
JWT tokens. This may be used to supply attacker controlled keys to
validate tokens, if attacker has local access.
* CVE-2021-33515: On-path attacker could have injected plaintext commands
before STARTTLS negotiation that would be executed after STARTTLS
finished with the client.
- lib-index: Corrupted mime.parts in dovecot.index.cache may have
resulted in Panic: file imap-bodystructure.c: line 206 (part_write_body):
assertion failed: (text == ((part->flags & MESSAGE_PART_FLAG_TEXT) != 0))
- imap: SETMETADATA could not be used to unset metadata values.
Instead NIL was handled as a "NIL" string. v2.3.14 regression.
V2.3.14 2021-03-04 Aki Tuomi <[email protected]>
* Added new aliases for some variables. Usage of the old ones is possible,
but discouraged. (These were partially added already to v2.3.13.)
See https://doc.dovecot.org/configuration_manual/config_file/config_variables/
for more information.
* Optimize imap/pop3/submission/managesieve proxies to use less CPU at
the cost of extra memory usage.
* Remove autocreate, expire, snarf and mail-filter plugins.
* Remove cydir storage driver.
* Remove XZ/LZMA write support. Read support will be removed in future release.
* doveadm -D: Add timestamps to debug output even when LOG_STDERR_TIMESTAMP
environment variable is not set. Timestamp format is taken from
log_timestamp setting.
* If BROKENCHAR or listescape plugin is used, the escaped folder names
may be slightly different from before in some situations. This is
unlikely to cause issues, although caching clients may redownload the
folders.
* imapc: It now enables BROKENCHAR=~ by default to escape remote folder
names if necessary. This also means that if there are any '~'
characters in the remote folder names, they will be visible as "~7e".
* imapc: When using local index files folder names were escaped on
filesystem a bit differently. This affects only if there are folder
names that actually require escaping, which isn't so common. The old
style folders will be automatically deleted from filesystem.
* stats: Update exported metrics to be compliant with OpenMetrics standard.
+ doveadm: Add an optional '-p' parameter to metadata list command. If
enabled, "/private", and "/shared" metadata prefixes will be prepended
to the keys in the list output.
+ doveconf: Support environment variables in config files. See
https://doc.dovecot.org/configuration_manual/config_file/config_file_syntax/#environment-variables
for more details.
+ indexer-worker: Change indexer to disconnect from indexer-worker
after each request. This allows service indexer-worker's service_count &
idle_kill settings to work. These can be used to restart indexer-worker
processes once in a while to reduce their memory usage.
- auth: "nodelay" with various authentication mechanisms such as apop
and digest-md5 crashed AUTH process if authentication failed.
- auth: Auth lua script generating an error triggered an assertion
failure: Panic: file db-lua.c: line 630 (auth_lua_call_password_verify):
assertion failed: (lua_gettop(script->L) == 0).
- configure: Fix libunwind detection to work on other than x86_64 systems.
- doveadm-server: Process could crash if logging was done outside command
handling. For example http-client could have done debug logging
afterwards, resulting in either segfault or Panic:
file http-client.c: line 642 (http_client_context_close):
assertion failed: (cctx->clients_list == NULL).
- dsync: Folder name escaping with BROKENCHAR didn't work completely
correctly. This especially caused problems with dsync-migrations using
imapc where some of the remote folder names may not have been accessible.
- dsync: doveadm sync + imapc doesn't always sync all mails when doing
an incremental sync (-1), which could lead to mail loss when it's used
for migration. This happens only when GUIDs aren't used (i.e.
imapc without imapc_features=guid-forced).
- fts-tika: When tika server returns error, some mails cause Panic:
file message-parser.c: line 802 (message_parser_deinit_from_parts):
assertion failed: (ctx->nested_parts_count == 0 || i_stream_have_bytes_left(ctx->input))
- lib-imap: imapc parsing illegal BODYSTRUCTUREs with NILs could have
resulted in crashes. This exposed that Dovecot was wrongly accepting
atoms in "nstring" handling. Changed the IMAP parsing to be more
strict about this now.
- lib-index: If dovecot.index.cache has corrupted message size, fetching
BODY/BODYSTRUCTURE may cause assert-crash:
Panic: file index-mail.c: line 1140 (index_mail_parse_body_finish):
assertion failed: (mail->data.parts != NULL).
- lib-index: Minor error handling and race condition fixes related to
rotating dovecot.index.log. These didn't usually cause problems,
unless the log files were rotated rapidly.
- lib-lua: Lua scripts using coroutines or lua libraries using coroutines
(e.g., cqueues) panicked.
- Message PREVIEW handled whitespace wrong so first space would get
eaten from between words.
- FTS and message PREVIEW (snippet) parsed HTML &entities case-sensitively.
- lib-mail: When max nested MIME parts were reached, IMAP BODYSTRUCTURE
was written in a way that may have caused confusion for IMAP clients
and also Dovecot itself when parsing it. The truncated part is now
written out using application/octet-stream MIME type.
- lib-oauth2: HS512 and HS384 JWT token algorithms crash when you try to
use them: Panic: file hmac.c: line 26 (hmac_init): assertion failed:
(meth->context_size <= MAC_MAX_CONTEXT_SIZE).
- event filters: NOT keyword did not have the correct associativity.
NOT a AND b were getting parsed as NOT (a AND b) instead of
(NOT a) AND b.
- Ignore ECONNRESET when closing socket. This avoids logging useless
errors on systems like FreeBSD.
- event filters: event filter syntax error may lead to Panic:
file event-filter.c: line 137 (event_filter_parse): assertion failed:
(state.output == NULL)
- lib: timeval_cmp_margin() was broken on 32-bit systems. This could
potentially have caused HTTP timeouts to be handled incorrectly.
- log: instance_name wasn't used as syslog ident by the log process.
- master: After a service reached process_limit and client_limit, it
could have taken up to 1 second to realize that more client connections
became available. During this time client connections could have been
unnecessarily rejected and a warning logged:
Warning: service(...): process_limit (...) reached, client connections are being dropped
- stats: Crash would occur when generating openmetrics data for metrics
using aggregating functions.
- stats: Event filters comparing against empty strings crash the stats
process.
v2.3.13 2021-01-04 Aki Tuomi <[email protected]>
* CVE-2020-24386: Specially crafted command can cause IMAP hibernate to
allow logged in user to access other people's emails and filesystem
information.
* Metric filter and global event filter variable syntax changed to a
SQL-like format. See https://doc.dovecot.org/configuration_manual/event_filter/
* auth: Added new aliases for %{variables}. Usage of the old ones is
possible, but discouraged.
* auth: Removed RPA auth mechanism, SKEY auth mechanism, NTLM auth
mechanism and related password schemes.
* auth: Removed passdb-sia, passdb-vpopmail and userdb-vpopmail.
* auth: Removed postfix postmap socket
+ auth: Added new fields for auth server events. These fields are now
also available for all auth events. See
https://doc.dovecot.org/admin_manual/list_of_events/#authentication-server
for details.
+ imap-hibernate: Added imap_client_hibernated, imap_client_unhibernated
and imap_client_unhibernate_retried events. See
https://doc.dovecot.org/admin_manual/list_of_events/ for details.
+ lib-index: Added new mail_index_recreated event. See
https://doc.dovecot.org/admin_manual/list_of_events/#mail-index-recreated
+ lib-sql: Support TLS options for cassandra driver. This requires
cpp-driver v2.15 (or later) to work reliably.
+ lib-storage: Missing $HasAttachment / $HasNoAttachment flags are now
added to existing mails if mail_attachment_detection_option=add-flags
and it can be done inexpensively.
+ login proxy: Added login_proxy_max_reconnects setting (default 3) to
control how many reconnections are attempted.
+ login proxy: imap/pop3/submission/managesieve proxying now supports
reconnection retrying on more than just connect() failure. Any error
except a non-temporary authentication failure will result in reconnect
attempts.
- auth: Lua passdb/userdb leaks stack elements per call, eventually
causing the stack to become too deep and crashing the auth or
auth-worker process.
- auth: SASL authentication PLAIN mechanism could be used to trigger
read buffer overflow. However, this doesn't seem to be exploitable in
any way.
- auth: v2.3.11 regression: GSSAPI authentication fails because dovecot
disallows NUL bytes for it.
- dict: Process used too much CPU when iterating keys, because each key
used a separate write() syscall.
- doveadm-server: Crash could occur if logging was done outside command
handling. For example http-client could have done debug logging
afterwards, resulting in either segfault or
Panic: file http-client.c: line 642 (http_client_context_close):
assertion failed: (cctx->clients_list == NULL).
- doveadm-server: v2.3.11 regression: Trying to connect to doveadm server
process via starttls assert-crashed if there were no ssl=yes listeners:
Panic: file master-service-ssl.c: line 22 (master_service_ssl_init):
assertion failed: (service->ssl_ctx_initialized).
- fts-solr: HTTP requests may have assert-crashed:
Panic: file http-client-request.c: line 1232 (http_client_request_send_more):
assertion failed: (req->payload_input != NULL)
- imap: IMAP NOTIFY could crash with a segmentation fault due to a bad
configuration that causes errors. Sending the error responses to the
client can cause the segmentation fault. This can for example happen
when several namespaces use the same mail storage location.
- imap: IMAP NOTIFY used on a shared namespace that doesn't actually
exist (e.g. public namespace for a nonexistent user) can crash with a panic:
Panic: Leaked view for index /tmp/home/asdf/mdbox/dovecot.list.index: Opened in (null):0
- imap: IMAP session can crash with QRESYNC extension if many changes
are done before asking for expunged mails since last sync.
- imap: Process might hang indefinitely if client disconnects after
sending some long-running commands pipelined, for example FETCH+LOGOUT.
- lib-compress: Mitigate crashes when configuring a not compiled in
compression. Errors with compression configuration now distinguish
between not supported and unknown.
- lib-compression: Using xz/lzma compression in v2.3.11 could have
written truncated output in some situations. This would result in
"Broken pipe" read errors when trying to read it back.
- lib-compression: zstd compression could have crashed in some situations:
Panic: file ostream.c: line 287 (o_stream_sendv_int): assertion failed: (!stream->blocking)
- lib-dict: dict client could have crashed in some rare situations when
iterating keys.
- lib-http: Fix several assert-crashes in HTTP client.
- lib-index: v2.3.11 regression: When mails were expunged at the same
time as lots of new content was being saved to the cache (e.g. cache
file was lost and is being re-filled) a deadlock could occur with
dovecot.index.cache / dovecot.index.log.
- lib-index: v2.3.11 regression: dovecot.index.cache file was being
purged (rewritten) too often when it had a field that hadn't been
accessed for over 1 month, but less than 2 months. Every cache file
change caused a purging in this situation.
- lib-mail: MIME parts were not returned correctly by Dovecot MIME parser.
Regression caused by fixing CVE-2020-12100.
- lib-mail: When max nested MIME parts were reached, IMAP BODYSTRUCTURE
was written in a way that may have caused confusion for both IMAP
clients and Dovecot itself when parsing it. The truncated part is now
written out using application/octet-stream MIME type.
- lib-mail: v2.3.11 regression: Mail delivery / parsing crashed when the
10000th MIME part was message/rfc822 (or if parent was multipart/digest):
Panic: file message-parser.c: line 167 (message_part_append):
assertion failed: (ctx->total_parts_count <= ctx->max_total_mime_parts).
- lib-oauth2: Dovecot incorrectly required oauth2 server introspection
reply to contain username with invalid token.
- lib-ssl-iostream, lib-dcrypt: Fix building with OpenSSL that has
deprecated APIs disabled.
- lib-storage: When mail's size is different from the cached one (in
dovecot.index.cache or Maildir S=size in the filename), this is
handled by logging "Cached message size smaller/larger than expected"
error. However, in some situations this also ended up crashing with:
Panic: file istream.c: line 315 (i_stream_read_memarea):
assertion failed: (old_size <= _stream->pos - _stream->skip).
- lib-storage: v2.3 regression: Copying/moving mails was taking much more
memory than before. This was mainly visible when copying/moving
thousands of mails in a single transaction.
- lib-storage: v2.3.11 regression: Searching messages assert-crashed
(without FTS): Panic: file message-parser.c: line 174 (message_part_finish):
assertion failed: (ctx->nested_parts_count > 0).
- lib: Dovecot v2.3 moved signal handlers around in ioloops,
causing more CPU usage than in v2.2.
- lib: Fixed JSON parsing: '\' escape sequence may have wrongly resulted
in error if it happened to be at read boundary. Any NUL characters and
'\u0000' will now result in parsing error instead of silently
truncating the data.
- lmtp, submission: Server may hang if SSL client connection disconnects
during the delivery. If this happened repeated, it could have ended
up reaching process_limit and preventing any further lmtp/submission
deliveries.
- lmtp: Proxy does not always properly log TLS connection problems as
errors; in some cases, only a debug message is logged if enabled.
- lmtp: The LMTP service can hang when commands are pipelined. This can
particularly occur when one command in the middle of the pipeline fails.
One example of this occurs for proxied LMTP transactions in which the
final DATA or BDAT command is pipelined after a failing RCPT command.
- login-proxy: The login_source_ips setting has no effect, and therefore
the proxy source IPs are not cycled through as they should be.
- master: Process was using 100% CPU in some situations when a broken
service was being throttled.
- pop3-login: POP3 login would fail with "Input buffer full" if the
initial response for SASL was too long.
- stats: Crash would occur when generating openmetrics data for metrics
using aggregating functions.
v2.3.11.3 2020-07-29 Aki Tuomi <[email protected]>
- pop3-login: Login didn't handle commands in multiple IP packets properly.
This mainly affected large XCLIENT commands or a large SASL initial
response parameter in the AUTH command.
- pop3: pop3_deleted_flag setting was broken, causing:
Panic: file seq-range-array.c: line 472 (seq_range_array_invert):
assertion failed: (range[count-1].seq2 <= max_seq)
v2.3.11.2 2020-07-13 Aki Tuomi <[email protected]>
- auth: Lua passdb/userdb leaks stack elements per call, eventually
causing the stack to become too deep and crashing the auth or
auth-worker process.
- lib-mail: v2.3.11 regression: MIME parts not returned correctly by
Dovecot MIME parser.
- pop3-login: Login would fail with "Input buffer full" if the initial
response for SASL was too long.
v2.3.11 2020-06-17 Aki Tuomi <[email protected]>
* CVE-2020-12100: Parsing mails with a large number of MIME parts could