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-*- coding: utf-8 -*-
Changes with Apache 2.4.25
*) Fix some build issues related to various modules.
[Rainer Jung]
Changes with Apache 2.4.24
*) SECURITY: CVE-2016-8740 (cve.mitre.org)
mod_http2: Mitigate DoS memory exhaustion via endless
CONTINUATION frames.
[Naveen Tiwari <naveen.tiwari@asu.edu> and CDF/SEFCOM at Arizona State
University, Stefan Eissing]
*) SECURITY: CVE-2016-5387 (cve.mitre.org)
core: Mitigate [f]cgi "httpoxy" issues.
[Dominic Scheirlinck <dominic vendhq.com>, Yann Ylavic]
*) SECURITY: CVE-2016-2161 (cve.mitre.org)
mod_auth_digest: Prevent segfaults during client entry allocation when
the shared memory space is exhausted.
[Maksim Malyutin <m.malyutin dsec.ru>, Eric Covener, Jacob Champion]
*) SECURITY: CVE-2016-0736 (cve.mitre.org)
mod_session_crypto: Authenticate the session data/cookie with a
MAC (SipHash) to prevent deciphering or tampering with a padding
oracle attack. [Yann Ylavic, Colm MacCarthaigh]
*) SECURITY: CVE-2016-8743 (cve.mitre.org)
Enforce HTTP request grammar corresponding to RFC7230 for request lines
and request headers, to prevent response splitting and cache pollution by
malicious clients or downstream proxies. [William Rowe, Stefan Fritsch]
*) Validate HTTP response header grammar defined by RFC7230, resulting
in a 500 error in the event that invalid response header contents are
detected when serving the response, to avoid response splitting and cache
pollution by malicious clients, upstream servers or faulty modules.
[Stefan Fritsch, Eric Covener, Yann Ylavic]
*) mod_rewrite: Limit runaway memory use by short circuiting some kinds of
looping RewriteRules when the local path significantly exceeds
LimitRequestLine. PR 60478. [Jeff Wheelhouse <apache wheelhouse.org>]
*) mod_ratelimit: Allow for initial "burst" amount at full speed before
throttling: PR 60145 [Andy Valencia <ajv-etradanalhos vsta.org>,
Jim Jagielski]
*) mod_socache_memcache: Provide memcache stats to mod_status.
[Jim Jagielski]
*) http_filters: Fix potential looping in new check_headers() due to new
pattern of ap_die() from http header filter. Explicitly clear the
previous headers and body.
*) core: Drop Content-Length header and message-body from HTTP 204 responses.
PR 51350 [Luca Toscano]
*) mod_proxy: Honor a server scoped ProxyPass exception when ProxyPass is
configured in <Location>, like in 2.2. PR 60458.
[Eric Covener]
*) mod_lua: Fix default value of LuaInherit directive. It should be
'parent-first' instead of 'none', as per documentation. PR 60419
[Christophe Jaillet]
*) core: New directive HttpProtocolOptions to control httpd enforcement
of various RFC7230 requirements. [Stefan Fritsch, William Rowe]
*) core: Permit unencoded ';' characters to appear in proxy requests and
Location: response headers. Corresponds to modern browser behavior.
[William Rowe]
*) core: ap_rgetline_core now pulls from r->proto_input_filters.
*) core: Correctly parse an IPv6 literal host specification in an absolute
URL in the request line. [Stefan Fritsch]
*) core: New directive RegisterHttpMethod for registering non-standard
HTTP methods. [Stefan Fritsch]
*) mod_socache_memcache: Pass expiration time through to memcached.
[Faidon Liambotis <paravoid debian.org>, Joe Orton]
*) mod_cache: Use the actual URI path and query-string for identifying the
cached entity (key), such that rewrites are taken into account when
running afterwards (CacheQuickHandler off). PR 21935. [Yann Ylavic]
*) mod_http2: new directive 'H2EarlyHints' to enable sending of HTTP status
103 interim responses. Disabled by default. [Stefan Eissing]
*) mod_ssl: Fix quick renegotiation (OptRenegotiaton) with no intermediate
in the client certificate chain. PR 55786. [Yann Ylavic]
*) event: Allow to use the whole allocated scoreboard (up to ServerLimit
slots) to avoid scoreboard full errors when some processes are finishing
gracefully. Also, make gracefully finishing processes close all
keep-alive connections. PR 53555. [Stefan Fritsch]
*) mpm_event: Don't take over scoreboard slots from gracefully finishing
threads. [Stefan Fritsch]
*) mpm_event: Free memory earlier when shutting down processes.
[Stefan Fritsch]
*) mod_status: Display the process slot number in the async connection
overview. [Stefan Fritsch]
*) mod_dir: Responses that go through "FallbackResource" might appear to
hang due to unterminated chunked encoding. PR58292. [Eric Covener]
*) mod_dav: Fix a potential cause of unbounded memory usage or incorrect
behavior in a routine that sends <DAV:response>'s to the output filters.
[Evgeny Kotkov]
*) mod_http2: new directive 'H2PushResource' to enable early pushes before
processing of the main request starts. Resources are announced to the
client in Link headers on a 103 early hint response.
All responses with status code <400 are inspected for Link header and
trigger pushes accordingly. 304 still does prevent pushes.
'H2PushResource' can mark resources as 'critical' which gives them higher
priority than the main resource. This leads to preferred scheduling for
processing and, when content is available, will send it first. 'critical'
is also recognized on Link headers. [Stefan Eissing]
*) mod_proxy_http2: uris in Link headers are now mapped back to a suitable
local url when available. Relative uris with an absolute path are mapped
as well. This makes reverse proxy mapping available for resources
announced in this header.
With 103 interim responses being forwarded to the main client connection,
this effectively allows early pushing of resources by a reverse proxied
backend server. [Stefan Eissing]
*) mod_proxy_http2: adding support for newly proposed 103 status code.
[Stefan Eissing]
*) mpm_unix: Apache fails to start if previously crashed then restarted with
the same PID (e.g. in container). PR 60261.
[Val <valentin.bremond gmail.com>, Yann Ylavic]
*) mod_http2: unannounced and multiple interim responses (status code < 200)
are parsed and forwarded to client until a final response arrives.
[Stefan Eissing]
*) mod_proxy_http2: improved robustness when main connection is closed early
by resetting all ongoing streams against the backend.
[Stefan Eissing]
*) mod_http2: allocators from slave connections are released earlier,
resulting in less overall memory use on busy, long lived connections.
[Stefan Eissing]
*) mod_remoteip: Pick up where we left off during a subrequest rather
than running with the modified XFF but original TCP address.
PR 49839/PR 60251
*) http: Respond with "408 Request Timeout" when a timeout occurs while
reading the request body. [Yann Ylavic]
*) mod_http2: connection shutdown revisited: corrected edge cases on
shutting down ongoing streams, changed log warnings to be less noisy
when waiting on long running tasks. [Stefan Eissing]
*) mod_http2: changed all AP_DEBUG_ASSERT to ap_assert to have them
available also in normal deployments. [Stefan Eissing]
*) mod_http2/mod_proxy_http2: 100-continue handling now properly implemented
up to the backend. Reused HTTP/2 proxy connections with more than a second
not used will block request bodies until a PING answer is received.
Requests headers are not delayed by this, since they are repeatable in
case of failure. This greatly increases robustness, especially with
busy server and/or low keepalive connections. [Stefan Eissing]
*) mod_proxy_http2: fixed duplicate symbols with mod_http2.
[Stefan Eissing]
*) mod_http2: rewrite of how responses and trailers are transferred between
master and slave connection. Reduction of internal states for tasks
and streams, stability. Heuristic id generation for slave connections
to better keep promise of connection ids unique at given point int time.
Fix for mod_cgid interop in high load situtations.
Fix for handling of incoming trailers when no request body is sent.
[Stefan Eissing]
*) mod_http2: fix suspended handling for streams. Output could become
blocked in rare cases. [Stefan Eissing]
*) mpm_winnt: Prevent a denial of service when the 'data' AcceptFilter is in
use by replacing it with the 'connect' filter. PR 59970. [Jacob Champion]
*) mod_cgid: Resolve a case where a short CGI response causes a subsequent
CGI to be killed prematurely, resulting in a truncated subsequent
response. [Eric Covener]
*) mod_proxy_hcheck: Set health check URI and expression correctly for health
check worker. PR 60038 [zdeno <zdeno@scnet.sk>]
*) mod_http2: if configured with nghttp2 1.14.0 and onward, invalid request
headers will immediately reset the stream with a PROTOCOL error. Feature
logged by module on startup as 'INVHD' in info message.
[Stefan Eissing]
*) mod_http2: fixed handling of stream buffers during shutdown.
[Stefan Eissing]
*) mod_reqtimeout: Fix body timeout disabling for CONNECT requests to avoid
triggering mod_proxy_connect's AH01018 once the tunnel is established.
[Yann Ylavic]
*) ab: Set the Server Name Indication (SNI) extension on outgoing TLS
connections (unless -I is specified), according to the Host header (if
any) or the requested URL's hostname otherwise. [Yann Ylavic]
*) mod_proxy_fcgi: avoid loops when ProxyErrorOverride is enabled
and the error documents are proxied. PR 55415. [Luca Toscano]
*) mod_proxy_fcgi: read the whole FCGI response even when the content
has not been modified (HTTP 304) or in case of a precondition failure
(HTTP 412) to avoid subsequent bogus reads and confusing
error messages logged. [Luca Toscano]
*) mod_http2: h2 status resource follows latest draft, see
http://www.ietf.org/id/draft-benfield-http2-debug-state-01.txt
[Stefan Eissing]
*) mod_http2: handling graceful shutdown gracefully, e.g. handling existing
streams to the end. [Stefan Eissing]
*) mod_proxy_{http,ajp,fcgi}: don't reuse backend connections with data
available before the request is sent. PR 57832. [Yann Ylavic]
*) mod_proxy_balancer: Prevent redirect loops between workers within a
balancer by limiting the number of redirects to the number balancer
members. PR 59864 [Ruediger Pluem]
*) mod_proxy: Correctly consider error response codes by the backend when
processing failonstatus. PR 59869 [Ruediger Pluem]
*) mod_dav: Add dav_get_provider_name() function to obtain the name
of the provider from mod_dav. [Graham Leggett]
*) mod_dav: Add support for childtags to dav_error.
[Jari Urpalainen <jari.urpalainen nokia.com>]
*) mod_proxy_fcgi: Fix 2.4.23 breakage for mod_rewrite per-dir and query
string showing up in SCRIPT_FILENAME. PR59815
*) mod_include: Fix a potential memory misuse while evaluating expressions.
PR59844. [Eric Covener]
*) mod_http2: new H2CopyFiles directive that changes treatment of file
handles in responses. Necessary in order to fix broken lifetime handling
in modules such as mod_wsgi.
*) mod_http2: removing timeouts on master connection while requests are
being processed. Requests may timeout, but the master only times out when
no more requests are active. [Stefan Eissing]
*) mod_http2: fixes connection flush when answering SETTINGS without any
stream open. [Moto Ishizawa <@summerwind>, Stefan Eissing]
Changes with Apache 2.4.23
*) mod_ssl: reset client-verify state of ssl when aborting renegotiations.
[Erki Aring <erki@example.ee>, Stefan Eissing]
*) mod_sed: Fix 'x' command processing. [Christophe Jaillet]
*) configure: Fix ./configure edge-case failures around dependencies
of mod_proxy_hcheck. [William Rowe, Ruediger Pluem, Jeff Trawick]
Changes with Apache 2.4.22
*) mod_http2: fix for request abort when connections drops, introduced in
1.5.8
Changes with Apache 2.4.21
*) ab: Use caseless matching for HTTP tokens (e.g. content-length). PR 59111.
[Yann Ylavic]
*) mod_http2: more rigid error handling in DATA frame assembly, leading
to deterministic connection errors if assembly fails.
[Stefan Eissing, Pal Nilsen <https://github.com/maedox>]
*) abs: Include OPENSSL_Applink when compiling on Windows, to resolve
failures under Visual Studio 2015 and other mismatched MSVCRT flavors.
PR59630 [Jan Ehrhardt <phpdev ehrhardt.nl>]
*) mod_ssl: Add "no_crl_for_cert_ok" flag to SSLCARevocationCheck directive
to opt-in previous behaviour (2.2) with CRLs verification when checking
certificate(s) with no corresponding CRL. [Yann Ylavic]
*) mpm_event, mpm_worker: Fix computation of MinSpareThreads' lower bound
according the number of listeners buckets. [Yann Ylavic]
*) Add ap_cstr_casecmp[n]() - placeholder of apr_cstr_casecmp[n] functions
for case-insensitive C/POSIX-locale token comparison.
[Jim Jagielski, William Rowe, Yann Ylavic, Branko Čibej]
*) mod_userdir: Constify and save a few bytes in the conf pool when
parsing the "UserDir" directive. [Christophe Jaillet]
*) mod_cache: Fix (max-stale with no '=') and enforce (check
integers after '=') Cache-Control header parsing.
[Christophe Jaillet]
*) core: Add -DDUMP_INCLUDES configtest option to show the tree
of Included configuration files.
[Jacob Champion <champion.pxi gmail.com>]
*) mod_proxy_fcgi: Avoid passing a filename of proxy:fcgi:// as
SCRIPT_FILENAME to a FastCGI server. PR59618.
[Jacob Champion <champion.pxi gmail.com>]
*) mod_dav: Add dav_get_provider_name() function to obtain the name
of the provider from mod_dav.
[Jari Urpalainen <jari.urpalainen nokia.com>]
*) mod_proxy_http2: properly care for HTTP2 flow control of the frontend
connection is HTTP/1.1. [Patch supplied by Evgeny Kotkov]
*) mod_http2: improved cleanup of connection/streams/tasks to always
have deterministic order regardless of event initiating it. Addresses
reported crashes due to memory read after free issues.
[Stefan Eissing]
*) mod_ssl: Correct the interaction between SSLProxyCheckPeerCN and newer
SSLProxyCheckPeerName directives since release 2.4.5, such that disabling
either disables both, and that enabling either triggers the new, more
comprehensive SSLProxyCheckPeerName behavior. Only a single configuration
remains to enable the legacy behavior, which is to explicitly disable
SSLProxyCheckPeerName, and enable SSLProxyCheckPeerCN. [William Rowe]
*) mod_include: add the <!--#comment ...> syntax in order to include comments
in a SSI file. [Christophe Jaillet based on a suggestion from Rob]
*) mod_http2: improved event handling for suspended streams, responses
and window updates. [Stefan Eissing]
*) mod_proxy_hcheck: Provide for dynamic background health
checks on reverse proxies associated with BalancerMember
workers. [Jim Jagielski]
*) mod_http2: Fix async write issue that led to selection of wrong timeout
vs. keepalive timeout selection for idle sessions. [Stefan Eissing]
*) mod_http2: checking LimitRequestLine, LimitRequestFields and
LimitRequestFieldSize configurated values for incoming streams. Returning
HTTP status 431 for too long/many headers fields and 414 for a too long
pseudo header. [Stefan Eissing]
*) mod_http2: tracking conn_rec->current_thread on slave connections, so
that mod_lua finds the correct one. Fixes PR 59542. [Stefan Eissing]
*) mod_proxy_http2: new experimental http2 proxy module for h2: and h2c: proxy
urls. Part of the httpd mod_proxy framework, common settings apply.
Requests from the same HTTP/2 frontend connection against the same backend
are aggregated on a single connection.
[Stefan Eissing]
*) mod_http2: slave connections have conn_rec->aborted flag set when a stream
has been reset by the client. [Stefan Eissing]
*) mod_http2: merge of some 2.4.x adaptions re filters on slave connections.
Small fixes in bucket beams when forwarding file buckets. Output handling
on master connection uses less FLUSH and passes automatically when more
than half of H2StreamMaxMemSize bytes have accumulated.
Workaround for http: when forwarding partial file buckets to keep the
output filter from closing these too early. [Stefan Eissing]
*) mod_http2: elimination of fixed master connection buffer for TLS
connections. New scratch bucket handling optimized for TLS write sizes.
File bucket data read directly into scratch buffers, avoiding one
copy. Non-TLS connections continue to pass buckets unchanged to the core
filters to allow sendfile() usage. [Stefan Eissing]
*) mod_http2/mod_proxy_http2: h2_request.c is no longer shared between these
modules. This simplifies building on platforms such as Windows, as module
reference used in logging is now clear. [Stefan Eissing]
*) Scoreboard: Fix a regression in 2.4.20 that causes wrong request data
to be displayed on the status page. PR 59333. [Yann Ylavic, William Rowe]
*) mod_http2: fixed a bug that caused mod_proxy_http2 to be called for window
updates on requests it had already reported done. Added synchronization
on early connection/stream close that lets ongoing requests safely drain
their input filters.
[Stefan Eissing]
*) mod_http2: scoreboard updates that summarize the h2 session (and replace
the last request information) will only happen when the session is idle or
in shutdown/done phase. [Stefan Eissing]
*) mod_http2: new "bucket beam" technology to transport buckets across
threads without buffer copy. Delaying response start until flush or
enough body data has been accumulated. Overall significantly smaller
memory footprint. [Stefan Eissing]
*) core: New CGIVar directive can configure REQUEST_URI to represent the
current URI being processed instead of always the original request.
[Jeff Trawick]
*) scoreboard/status: Restore behavior of showing workers' previous Client,
VHost and Request values when idle, like in 2.4.18 and earlier.
*) mod_http2: r->protocol changed to "HTTP/2.0" (was "HTTP/2") as this will
give expected syntax in CGI's SERVER_PROTOCOL is more compatible with
existing major/minor handling. Fixes PR 59313.
*) mod_http2: disabling mmap for file buckets transport due to segmenation
faults when files change on the fly.
Changes with Apache 2.4.20
*) SECURITY: CVE-2016-1546 (cve.mitre.org)
mod_http2: restricting number of concurrent stream workers per connection
if client is slow.
*) core: Do not read .htaccess if AllowOverride and AllowOverrideList
are "None". PR 58528.
[Michael Schlenker <msc contact.de, Ruediger Pluem, Daniel Ruggeri]
*) mod_proxy_express: Fix possible use of DB handle after close. PR 59230.
[Petr <pgajdos suse.cz>]
*) core/util_script: relax alphanumeric filter of environment variable names
on Windows to allow '(' and ')' for passing PROGRAMFILES(X86) et.al.
unadulterated in 64 bit versions of Windows. PR 46751.
[John <john leineweb de>]
*) mod_http2: incrementing keepalives on each request started so that logging
%k gives increasing numbers per master http2 connection.
New documented variables in env, usable in custom log formats: H2_PUSH,
H2_PUSHED, H2_PUSHED_ON, H2_STREAM_ID and H2_STREAM_TAG.
[Stefan Eissing]
*) mod_http2: more efficient passing of response bodies with less contention
and file bucket forwarding. [Stefan Eissing]
*) mod_http2: fix for missing score board updates on request count, fix for
memory leak on slave connection reuse. [Stefan Eissing]
*) mod_http2: Fix build on Windows from dsp files.
[Stefan Eissing]
Changes with Apache 2.4.19
*) mod_include: Add variable DOCUMENT_ARGS, with the arguments to the
request for the SSI document. [Jeff Trawick]
*) mod_authz_host: Add a new "forward-dns" authorization type, not relying on
reverse DNS lookups. [Fabien]
*) mod_proxy_http2: new experimental http2 proxy module for h2: and h2c: proxy
urls. Uses backend connections for concurrent requests if frontend
connection is http2 as well.
[Stefan Eissing]
*) mod_ssl: Add hooks to allow other modules to perform processing at
several stages of initialization and connection handling. See
mod_ssl_openssl.h. [Jeff Trawick]
*) mod_http2: disabling PUSH when client sends GOAWAY. Slave connections are
reused for several requests, improved performance and better memory use.
[Stefan Eissing]
*) mod_rewrite: Don't implicitly URL-escape the original query string
when no substitution has changed it (like PR50447 but server context)
[Evgeny Kotkov <evgeny.kotkov visualsvn.com>]
*) mod_http2: fixes problem with wrong lifetime of file buckets on main
connection. [Stefan Eissing]
*) mod_http2: fixes incorrect denial of requests without :authority header.
[Stefan Eissing]
*) mod_reqtimeout: Prevent long response times from triggering a timeout once
the request has been fully read. PR 59045. [Yann Ylavic]
*) ap_expr: expression support for variable HTTP2=on|off. [Stefan Eissing]
*) mod_http2: give control to async mpm for keepalive timeouts only when
no streams are open and even if only after 1 sec delay. Under load, event
mpm discards connections otherwise too quickly. [Stefan Eissing]
*) mod_ssl: Don't lose track of the SSL context if an unlikely failure occurs
in ssl_init_ssl_connection(). [Graham Leggett]
*) mod_rewrite: Add QSL|qslast flag to allow rewrites to files with
literal question marks in their names. PR 58777. [Eric Covener]
*) event: use pre_connection hook to properly initialize connection state for
slave connections. use protocol_switch hook to initialize server config
early based on SNI selected vhost.
[Stefan Eissing]
*) hostname: Test and log useragent_host per-request across various modules,
including the scoreboard, expression and rewrite engines, setenvif,
authz_host, access_compat, custom logging, ssl and REMOTE_HOST variables.
PR55348 [William Rowe]
*) core: Track the useragent_host per-request when mod_remoteip or similar
modules track a per-request useragent_ip. Modules should be updated
to inquire for ap_get_useragent_host() in place of ap_get_remote_host().
[William Rowe]
*) core: fix a bug in <UnDefine ...> directive processing. When used, the last
<Define...>'ed variable was also withdrawn. PR 59019
[Christophe Jaillet]
*) mod_http2: Accept-Encoding is, when present on the initiating request,
added to push promises. This lets compressed content work in pushes.
by the client. [Stefan Eissing]
*) mod_http2: fixed possible read after free when streams were cancelled early
by the client. [Stefan Eissing]
*) mod_http2: fixed possible deadlock during connection shutdown. Thanks to
@FrankStolle for reporting and getting the necessary data.
[Stefan Eissing]
*) mod_http2: fixed apr_uint64_t formatting in a log statement to user proper
APR def, thanks to @Sp1l.
*) mod_http2: number of worker threads allowed to a connection is adjusting
dynamically. Starting with 4, the number is doubled when streams can be
served without block on http/2 connection flow. The number is halfed, when
the server has to wait on client flow control grants.
This can happen with a maximum frequency of 5 times per second.
When a connection occupies too many workers, repeatable requests
(GET/HEAD/OPTIONS) are cancelled and placed back in the queue. Should that
not suffice and a stream is busy longer than the server timeout, the
connection will be aborted with error code ENHANCE_YOUR_CALM.
This does *not* limit the number of streams a client may open, rather the
number of server threads a connection might use.
[Stefan Eissing]
*) mod_http2: allowing link header to specify multiple "rel" values,
space-separated inside a quoted string. Prohibiting push when Link
parameter "nopush" is present.
[Stefan Eissing]
*) mod_http2: reworked connection state handling. Idle connections accept a
GOAWAY from the client without further reply. Otherwise the
module makes a best effort to send one last GOAWAY to the client.
*) mod_http2: the values from standard directives Timeout and KeepAliveTimeout
properly are applied to http/2 connections.
[Stefan Eissing]
*) mod_http2: idle connections are returned to async mpms. new hook
"pre_close_connection" used to send GOAWAY frame when not already done.
Setting event mpm server config "by hand" for the main connection to
the correct negotiated server.
[Stefan Eissing]
*) mod_http2: keep-alive blocking reads are done with 1 second timeouts to
check for MPM stopping. Will announce early GOAWAY and finish processing
open streams, then close.
[Stefan Eissing]
*) mod_http2: bytes read/written on slave connections are reported via the
optional mod_logio functions. Fixes PR 58871.
*) prefork: Initialize the POD when running in ONE_PROCESS (or -X) mode to
avoid a crash. [Jan Kaluza, Yann Ylavic]
*) mod_ssl: When SSLVerify is disabled (NONE), don't force a renegotiation if
the SSLVerifyDepth applied with the default/handshaken vhost differs from
the one applicable with the finally selected vhost. [Yann Ylavic]
*) core: Ensure that httpd exits with an error status when the MPM fails
to run. [Yann Ylavic]
*) mod_ssl: Fix a possible memory leak on restart for custom [EC]DH params.
[Jan Kaluza, Yann Ylavic]
*) mod_ssl: Add SSLOCSPProxyURL to add the possibility to do all queries
to OCSP responders through a HTTP proxy. [Ruediger Pluem]
*) mod_proxy: Play/restore the TLS-SNI on new backend connections which
had to be issued because the remote closed the previous/reusable one
during idle (keep-alive) time. [Yann Ylavic]
*) mod_cache_socache: Fix a possible cached entity body corruption when it
is received from an origin server in multiple batches and forwarded by
mod_proxy. [Yann Ylavic]
*) core: Add expression support to SetHandler.
[Eric Covener]
*) mod_remoteip: Prevent an external proxy from presenting an internal
proxy. PR 55962. [Mike Rumph]
*) core: Prevent a server crash in case of an invalid CONNECT request with
a custom error page for status code 400 that uses server side includes.
PR 58929 [Ruediger Pluem]
*) mod_ssl: handle TIMEOUT on empty SSL input as non-fatal, returning
APR_TIMEUP and preserving connection state for later retry.
[Stefan Eissing]
*) mod_ssl: Save some TLS record (application data) fragmentations by
including the last and subsequent suitable buckets when coalescing.
[Yann Ylavic]
*) mod_proxy_fcgi: Suppress HTTP error 503 and message 01075,
"Error dispatching request", when the cause appears to be
due to the client closing the connection.
PR58118. [Tobias Adolph <adolph lrz.de>]
*) mod_cgid: Message AH02550, failure to flush a response to the client,
is now logged at TRACE1 level to match the underlying core output filter
severity. [Eric Covener]
*) mime.types: add common extension "m4a" for MPEG 4 Audio.
PR 57895 [Dylan Millikin <dylan.millikin gmail.com>]
*) Added many log numbers to log statements that had none.
[Rainer Jung]
*) mod_log_config: Add GlobalLog to allow a globally defined log to
be inherited by virtual hosts that define a CustomLog.
[Edward Lu]
*) mod_http2: connections how keep a "push diary" where hashes of already
pushed resources are kept. See directive H2PushDiarySize for managing this.
Push diaries can be initialized by clients via the "Cache-Digest" request
header. This carries a base64url encoded. compressed Golomb set as described
in https://datatracker.ietf.org/doc/draft-kazuho-h2-cache-digest/
Introduced a status handler for HTTP/2 connections, giving various counters
and statistics about the current connection, plus its cache digest value
in a JSON record. Not a replacement for more HTTP/2 in the server status.
Configured as
<Location "/http2-status">
SetHandler http2-status
</Location>
[Stefan Eissing]
*) mod_http2: Fixed flushing of last GOAWAY frame. Previously, that frame
did not always reach the client, causing some to fail the next request.
Fixed calculation of last stream id accepted as described in rfc7540.
Reading in KEEPALIVE state now correctly shown in scoreboard.
Fixed possible race in connection shutdown after review by Ylavic.
Fixed segfault on connection shutdown, callback ran into a semi dismantled session.
[Stefan Eissing]
*) mod_http2: Added support for experimental accept-push-policy draft
(https://tools.ietf.org/html/draft-ruellan-http-accept-push-policy-00). Clients
may now influence server pushes by sending accept-push-policy headers.
[Stefan Eissing]
*) mod_http2: new r->subprocess_env variables HTTP2 and H2PUSH, set to "on"
when available for request.
[Stefan Eissing]
*) mod_http2: fixed bug in input window size calculation by moving chunked
request body encoding into later stage of processing. Fixes PR 58825.
[Stefan Eissing]
*) core: new hook "pre_close_connection" which is run before the lingering
close of connections is started. This gives protocol handlers one last
chance to use a connection before it goes down.
[Stefan Eissing]
*) mod_status/scoreboard: showing connection protocol in new column, new
ap_update_child_status methods for updating server/description. mod_ssl
sets vhost negotiated by servername directly.
[Stefan Eissing]
Changes with Apache 2.4.18
*) mod_ssl: for all ssl_engine_vars.c lookups, fall back to master connection
if conn_rec itself holds no valid SSLConnRec*. Fixes PR58666.
[Stefan Eissing]
*) mod_http2: connection level window for flow control is set to protocol
maximum of 2GB-1, preventing window exhaustion when sending data on many
streams with higher cumulative window size.
Reducing write frequency unless push promises need to be flushed.
[Stefan Eissing]
*) mod_http2: required minimum version of libnghttp2 is 1.2.1
[Stefan Eissing]
*) mod_proxy_fdpass: Fix AH01153 error when using the default configuration.
In earlier version of httpd, you can explicitelly set the 'flusher' parameter
to 'flush' as a workaround. (i.e. flusher=flush)
Add documentation for the 'flusher' parameter when defining a proxy worker.
[Christophe Jaillet]
*) mod_ssl: For the "SSLStaplingReturnResponderErrors off" case, make sure
to only staple responses with certificate status "good". [Kaspar Brand]
*) mod_http2: new directive 'H2PushPriority' to allow priority specifications
on server pushed streams according to their content-type.
[Stefan Eissing]
*) mod_http2: fixes crash on connection abort for a busy connection.
fixes crash on a request that did not produce any response.
[Stefan Eissing]
*) mod_http2: trailers are sent after response body if set in request_rec
trailers_out before the end-of-request bucket is sent through the
output filters. [Stefan Eissing]
*) mod_http2: incoming trailers (headers after request body) are properly
forwarded to the processing engine. [Stefan Eissing]
*) mod_http2: new directive 'H2Push' to en-/disable HTTP/2 server
pushes a server/virtual host. Pushes are initiated by the presence
of 'Link:' headers with relation 'preload' on a response. [Stefan Eissing]
*) mod_http2: write performance of http2 improved for larger resources,
especially static files. [Stefan Eissing]
*) core: if the first HTTP/1.1 request on a connection goes to a server that
prefers different protocols, these protocols are announced in a Upgrade:
header on the response, mentioning the preferred protocols.
[Stefan Eissing]
*) mod_http2: new directives 'H2TLSWarmUpSize' and 'H2TLSCoolDownSecs'
to control TLS record sizes during connection lifetime.
[Stefan Eissing]
*) mod_http2: new directive 'H2ModernTLSOnly' to enforce security
requirements of RFC 7540 on TLS connections. [Stefan Eissing]
*) core: add ap_get_protocol_upgrades() to retrieve the list of protocols
that a client could possibly upgrade to. Use in first request on a
connection to announce protocol choices. [Stefan Eissing]
*) mod_http2: reworked deallocation on connection shutdown and worker
abort. Separate parent pool for all workers. worker threads are joined
on planned worker shutdown. [Yann Ylavic, Stefan Eissing]
*) mod_ssl: when receiving requests for other virtual hosts than the handshake
server, the SSL parameters are checked for equality. With equal
configuration, requests are passed for processing. Any change will trigger
the old behaviour of "421 Misdirected Request".
SSL now remembers the cipher suite that was used for the last handshake.
This is compared against for any vhost/directory cipher specification.
Detailed examination of renegotiation is only done when these do not
match.
Renegotiation is 403ed when a master connection is present. Exact reason
is given additionally in a request note. [Stefan Eissing]
*) mod_ssl: Make the output filter more friendly with deferred write and
response pipelining. [Yann Ylavic, Joe Orton]
*) core: Fix scoreboard crash (SIGBUS) on hardware requiring strict 64bit
alignment (SPARC64, PPC64). [Yann Ylavic]
*) mod_cache: Accept HT (Horizontal Tab) when parsing cache related header
fields as described in RFC7230. [Christophe Jaillet]
*) core/util_script: making REDIRECT_URL a full URL is now opt-in
via new 'QualifyRedirectURL' directive.
*) core: Limit to ten the number of tolerated empty lines between request,
and consume them before the pipelining check to avoid possible response
delay when reading the next request without flushing. [Yann Ylavic]
*) mod_ssl: Extend expression parser registration to support ssl variables
in any expression using mod_rewrite syntax "%{SSL:VARNAME}" or function
syntax "ssl(VARNAME)". [Rainer Jung]
Changes with Apache 2.4.17
*) mod_http2: added donated HTTP/2 implementation via core module. Similar
configuration options to mod_ssl. [Stefan Eissing]
*) mod_proxy: don't recyle backend announced "Connection: close" connections
to avoid reusing it should the close be effective after some new request
is ready to be sent. [Yann Ylavic]
*) mod_substitute: Allow to configure the patterns merge order with the new
SubstituteInheritBefore on|off directive. PR 57641
[Marc.Stern <Marc.Stern approach.be>, Yann Ylavic, William Rowe]
*) mod_proxy: Fix ProxySourceAddress binding failure with AH00938.
PR 56687. [Arne de Bruijn <apache arbruijn.dds.nl>
*) mod_ssl: Support compilation against libssl built with OPENSSL_NO_SSL3,
and change the compiled-in default for SSL[Proxy]Protocol to "all -SSLv3",
in accordance with RFC 7568. PR 58349, PR 57120. [Kaspar Brand]
*) mod_ssl: append :!aNULL:!eNULL:!EXP to the cipher string settings,
instead of prepending !aNULL:!eNULL:!EXP: (as was the case in 2.4.7
and later). Enables support for configuring the SUITEB* cipher
strings introduced in OpenSSL 1.0.2. PR 58213. [Kaspar Brand]
*) mod_ssl: Add support for extracting the msUPN and dnsSRV forms
of subjectAltName entries of type "otherName" into
SSL_{CLIENT,SERVER}_SAN_OTHER_{msUPN,dnsSRV}_n environment
variables. Addresses PR 58020. [Jan Pazdziora <jpazdziora redhat.com>,
Kaspar Brand]
*) mod_logio: Fix logging of %^FB (time to first byte) on the first request on
an SSL connection. PR 58454.
[Konstantin J. Chernov <k.j.chernov gmail.com>]
*) mod_cache: r->err_headers_out is not merged into
r->headers when mod_cache is enabled and the response
is cached for the first time. [Edward Lu]
*) mod_slotmem_shm: Fix slots/SHM files names on restart for systems that
can't create new (clear) slots while previous children gracefully stopping
still use the old ones (e.g. Windows, OS2). mod_proxy_balancer failed to
restart whenever the number of configured balancers/members changed during
restart. PR 58024. [Yann Ylavic]
*) core/util_script: make REDIRECT_URL a full URL. PR 57785. [Nick Kew]
*) MPMs: Support SO_REUSEPORT to create multiple duplicated listener
records for scalability. [Yingqi Lu <yingqi.lu@intel.com>,
Jeff Trawick, Jim Jagielski, Yann Ylavic]
*) mod_alias: Introduce expression parser support for Alias, ScriptAlias
and Redirect. Limit Redirect expressions to directory (Location) context
and redirect statuses (implicit or explicit).
[Graham Leggett, Yann Ylavic, Ruediger Pluem]
*) mod_proxy: Fix a race condition that caused a failed worker to be retried
before the retry period is over. [Ruediger Pluem]
*) mod_autoindex: Allow autoindexes when neither mod_dir nor mod_mime are
loaded. [Eric Covener]
*) mod_rewrite: Allow cookies set by mod_rewrite to contain ':' by accepting
';' as an alternate separator. PR47241.
[<bugzilla schermesser com>, Eric Covener]
*) apxs: Add HTTPD_VERSION and HTTPD_MMN to the variables available with
apxs -q. PR58202. [Daniel Shahaf <danielsh apache.org>]
*) mod_rewrite: Avoid a crash when lacking correct DB access permissions
when using RewriteMap with MapType dbd or fastdbd. [Christophe Jaillet]
*) mod_authz_dbd: Avoid a crash when lacking correct DB access permissions.
PR 57868. [Jose Kahan <jose w3.org>, Yann Ylavic]
*) mod_socache_memcache: Add the 'MemcacheConnTTL' directive to control how
long to keep idle connections with the memcache server(s).
Change default value from 600 usec (!) to 15 sec. PR 58091
[Christophe Jaillet]
*) mod_dir: Prevent the internal identifier "httpd/unix-directory" from
appearing as a Content-Type response header when requests for a directory
are rewritten by mod_rewrite. [Eric Covener]
Changes with Apache 2.4.16
*) http: Fix LimitRequestBody checks when there is no more bytes to read.
[Michael Kaufmann <mail michael-kaufmann.ch>]
*) mod_alias: Revert expression parser support for Alias, ScriptAlias
and Redirect due to a regression (introduced in 2.4.13, not released).
*) mod_reqtimeout: Don't let pipelining checks and keep-alive times interfere
with the timeouts computed for subsequent requests. PR 56729.
[Eric Covener, Yann Ylavic]
*) core: Avoid a possible truncation of the faulty header included in the
HTML response when LimitRequestFieldSize is reached. [Yann Ylavic]
*) mod_ldap: In some case, LDAP_NO_SUCH_ATTRIBUTE could be returned instead
of an error during a compare operation. [Eric Covener]
Changes with Apache 2.4.15 (not released)
*) mod_ext_filter, mod_charset_lite: Avoid inadvertent filtering of protocol
data during read of chunked request bodies. PR 58049.
[Edward Lu <Chaosed0 gmail.com>]
*) mod_ldap: Stop leaking LDAP connections when 'LDAPConnectionPoolTTL 0'
is configured. PR 58037. [Ted Phelps <phelps gnusto.com>]
*) core: Allow spaces after chunk-size for compatibility with implementations
using a pre-filled buffer. [Yann Ylavic, Jeff Trawick]
*) mod_ssl: Remove deprecated SSLCertificateChainFile warning.
[Yann Ylavic]
Changes with Apache 2.4.14 (not released)
*) SECURITY: CVE-2015-3183 (cve.mitre.org)
core: Fix chunk header parsing defect.
Remove apr_brigade_flatten(), buffering and duplicated code from
the HTTP_IN filter, parse chunks in a single pass with zero copy.
Limit accepted chunk-size to 2^63-1 and be strict about chunk-ext
authorized characters. [Graham Leggett, Yann Ylavic]
*) SECURITY: CVE-2015-3185 (cve.mitre.org)
Replacement of ap_some_auth_required (unusable in Apache httpd 2.4)
with new ap_some_authn_required and ap_force_authn hook. [Ben Reser]
Changes with Apache 2.4.13 (not released)
*) SECURITY: CVE-2015-0253 (cve.mitre.org)
core: Fix a crash with ErrorDocument 400 pointing to a local URL-path
with the INCLUDES filter active, introduced in 2.4.11. PR 57531.
[Yann Ylavic]
*) SECURITY: CVE-2015-0228 (cve.mitre.org)
mod_lua: A maliciously crafted websockets PING after a script
calls r:wsupgrade() can cause a child process crash.
[Edward Lu <Chaosed0 gmail.com>]
*) mod_proxy: Don't put the worker in error state for 500 or 503 errors
returned by the backend unless failonstatus is configured to. PR 56925.
[Yann Ylavic]
*) core: Don't lowercase the argument to SetHandler if it begins with
"proxy:unix". PR 57968. [Eric Covener]
*) mod_ssl OCSP Stapling: Don't block initial handshakes while refreshing
the OCSP response for a different certificate. mod_ssl has an additional
global mutex, "ssl-stapling-refresh". PR 57131 (partial fix).
[Jeff Trawick]
*) mod_authz_dbm: Fix crashes when "dbm-file-group" is used and
authz modules were loaded in the "wrong" order. [Joe Orton]
*) mod_authn_dbd, mod_authz_dbd, mod_session_dbd, mod_rewrite: Fix lifetime
of DB lookup entries independently of the selected DB engine. PR 46421.
[Steven whitson <steven.whitson gmail com>, Jan Kaluza, Yann Ylavic].
*) In alignment with RFC 7525, the default recommended SSLCipherSuite
and SSLProxyCipherSuite now exclude RC4 as well as MD5. Also, the
default recommended SSLProtocol and SSLProxyProtocol directives now
exclude SSLv3. Existing configurations must be adjusted by the
administrator. [William Rowe]
*) mod_ssl: Add support for extracting subjectAltName entries of type
rfc822Name and dNSName into SSL_{CLIENT,SERVER}_SAN_{Email,DNS}_n
environment variables. Also addresses PR 57207. [Kaspar Brand]
*) dav_validate_request: avoid validating locks and ETags when there are
no If headers providing them on a resource we aren't modifying.
[Ben Reser]
*) mod_proxy_scgi: ProxySCGIInternalRedirect now allows an alternate
response header to be used by the application, for when the application
or framework is unable to return Location in the internal-redirect
form. [Jeff Trawick]
*) core: Cleanup the request soon/even if some output filter fails to
handle the EOR bucket. [Yann Ylavic]
*) mpm_event: Allow for timer events duplicates. [Jim Jagielski, Yann Ylavic]
*) mod_proxy, mod_ssl, mod_cache_socache, mod_socache_*: Support machine
readable server-status produced when using the "?auto" query string.
[Rainer Jung]
*) mod_status: Add more data to machine readable server-status produced
when using the "?auto" query string. [Rainer Jung]
*) mod_ssl: Check for the Entropy Gathering Daemon (EGD) availability at
configure time (RAND_egd), and complain if SSLRandomSeed requires using
it otherwise. [Bernard Spil <pil.oss gmail com>, Stefan Sperling,
Kaspar Brand]
*) mod_ssl: make sure to consistently output SSLCertificateChainFile
deprecation warnings, when encountered in a VirtualHost block.
[Falco Schwarz <hiding falco.me>]
*) mod_log_config: Add "%{UNIT}T" format to output request duration in
seconds, milliseconds or microseconds depending on UNIT ("s", "ms", "us").
[Ben Reser, Rainer Jung]
*) Allow FallbackResource to work when a directory is requested and
there is no autoindex nor DirectoryIndex.
[Jack <tjerk.meesters gmail.com>, Eric Covener]
*) mod_proxy_wstunnel: Bypass the handler while the connection is not
upgraded to WebSocket, so that other modules can possibly take over
the leading HTTP requests. [Yann Ylavic]
*) mod_http: Fix incorrect If-Match handling. PR 57358
[Kunihiko Sakamoto <ksakamoto google.com>]
*) mod_ssl: Add a warning if protocol given in SSLProtocol or SSLProxyProtocol
will override other parameters given in the same directive. This could be
a missing + or - prefix. PR 52820 [Christophe Jaillet]
*) core, modules: Avoid error response/document handling by the core if some
handler or input filter already did it while reading the request (causing
a double response body). [Yann Ylavic]
*) mod_proxy_ajp: Fix client connection errors handling and logged status
when it occurs. PR 56823. [Yann Ylavic]
*) mod_proxy: Use the correct server name for SNI in case the backend
SSL connection itself is established via a proxy server.
PR 57139 [Szabolcs Gyurko <szabolcs gyurko.org>]
*) mod_ssl: Fix possible crash when loading server certificate constraints.