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As per RFC 9110, this header SHOULD be removed by a proxy.
Also, as per RFC 9113, this header MUST be removed when proxying to an
HTTP/2 backend.
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The "include" directive should be able to include multiple files if
given a filename mask.
Completes remaining changes introduced in da4ffd8.
Closes: https://github.com/nginx/nginx/issues/1165
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Previously, when alias was used in a location with Dav COPY or MOVE
enabled, and the destination URI was shorter than the alias, integer
underflow could happen in ngx_http_map_uri_to_path(), which could
result in heap buffer overwrite, followed by a possible segfault.
With some implementations of memcpy(), the segfault could be avoided
and the overwrite could result in a change of the source or destination
file names to be outside of the location root.
Reported by Calif.io in collaboration with Claude and Anthropic Research.
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Previously, a 32-bit overflow could happen while validating atom entries
count. This allowed processing of an invalid atom with entrires beyond
its boundaries with reads and writes outside of the allocated mp4 buffer.
Reported by Prabhav Srinath (sprabhav7).
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Previously, data validation checks did not cover the cases when the output
contained empty buffers. Such buffers are considered illegal and produce
"zero size buf in output" alerts. The change rejects the mp4 files which
produce such alerts.
Also, the change fixes possible buffer overread and overwrite that could
happen while processing empty stco and co64 atoms, as reported by
Pavel Kohout (Aisle Research) and Tim Becker.
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Updates the proxy module to use HTTP/1.1 as the default protocol when
communicating with upstream servers. This change unlocks features
such as persistent connections and chunked transfer encoding. Configurations
that require HTTP/1.0 can still override the protocol explicitly.
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Keepalive is now automatically enabled in the "local" mode for upstreams
defined in configuration files. Cached keepalive connections are no longer
shared between different locations referencing the same explicit upstream
unless keepalive is explicitly configured without the "local" parameter.
To disable keepalive entirely, use keepalive 0; inside the upstream block.
To allow sharing cached connections between locations, configure
keepalive <max_cached>; without the "local" parameter.
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The new "local" parameter prevents sharing cached keepalive connections
between location blocks. Connections are now reused only within the same
location.
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Previously, ctx->out was not cleared in ngx_http_grpc_reinit_request(),
which could cause queued HTTP/2 control frames (SETTINGS ACK, PING ACK,
WINDOW_UPDATE) to be sent on next upstream.
Additionally, ctx->in and ctx->busy needs to be cleared to avoid similar
problems with buffered request body fixed in cd12dc4f1.
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Previously, ctx->out was not cleared in ngx_http_proxy_v2_reinit_request(),
which could cause stale HTTP/2 control frames (SETTINGS ACK, PING ACK,
WINDOW_UPDATE) queued for the old upstream connection to be sent to a new
upstream connection during a retry.
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Previously, the expiration timer for learned session was not started
until a new session is created. This could lead to the sessions being
active past the expiration time.
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Adds new options for the "sticky cookie" directive to set
samesite=<strict|lax|none> cookie flags.
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With this parameter set, sessions are learned after receiving upstream headers.
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RFC 6265 defines "Max-Age" cookie attribute in section 5.2.2.
If the "expires" option is passed to the "sticky" directive, "max-age"
attribute will appear in cookies set by the module with corresponding
value in seconds.
For the special "max" value of the "expires" option, corresponding "max-age"
attribute value will be set to 315360000 seconds (10 years, similar to
how its done in headers_filter module for the "Cache-Control" header).
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The attributes are described in RFC6265, sections 4.1.2.5 and 4.1.2.6
respectively.
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In this mode, nginx "learns" which client uses which proxied server by
analyzing headers of client requests and proxied server responses.
For example, a proxied server may start sessions by issuing the "Set-Cookie"
header field to set cookie 'sid' and returning clients will bring the cookie
with the same name.
The following configuration may be used to handle this case:
upstream u1 {
server 127.0.0.1:8080;
server 127.0.0.1:8081;
sticky learn timeout=10m zone=sess:1m
create=$upstream_cookie_sid
lookup=$cookie_sid;
}
Co-authored-by: Ruslan Ermilov <ru@nginx.com>
Co-authored-by: Maxim Dounin <mdounin@mdounin.ru>
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Sticky sessions allow to route the same client to the same upstream server.
- upstream structures are extended to keep session-related information
- existing balancing modules are updated to provide an id of the selected
server (SID) in pc->sid, and to select the server, given it's SID.
- other balancing modules are allowed to set the pc->hint value to choose
the desired peer. The sticky module will not change the hint if it's
already set.
- the feature is enabled by default and can be disabled with the
"--without-http_upstream_sticky" switch of the configure script.
The following configuration can be used to enable sticky sessions for
supported balancing modules:
upstream u1 {
server 127.0.0.1:8080;
server 127.0.0.1:8081;
sticky cookie server_id expires=1h domain=.example.com path=/;
}
Co-authored-by: Ruslan Ermilov <ru@nginx.com>
Co-authored-by: Roman Arutyunyan <arut@nginx.com>
Co-authored-by: Maxim Dounin <mdounin@mdounin.ru>
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Per ISO 14496-12 Section 8.6.2, sync sample numbers must be 1-based.
A zero-valued stss entry caused ngx_http_mp4_seek_key_frame() to
return a key_prefix exceeding the samples consumed in the forward
stts pass, which led the backward loop in ngx_http_mp4_crop_stts_data()
to walk past the beginning of the stts data buffer.
The fix validates each stss entry in ngx_http_mp4_seek_key_frame()
and returns an error if a zero sync sample is encountered. The
function signature is changed to return ngx_int_t so it can signal
errors to the caller.
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Passing requests to SCGI uses a recalculated size of a request body
as per changes made in d60b8d10f (1.3.9) to support CONTENT_LENGTH
with chunked body requests. This, however, is not compatible with
unbuffered mode introduced later in 7ec559df5 (1.7.11), where such
an approach may not always represent complete request body.
The fix is to use r->headers_in.content_length_n representing either
original Content-Length, if any, or a recalculated value from request
body filters, such as chunked body filter.
Reported by Mufeed VH.
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In case "Cookie" header is sent by client, multiple cookie pairs were
incorrectly split by a semicolon and comma.
Now they are split by a semicolon only.
For example, next variables will be found for "Cookie: a=b, c=d; e=f":
- $cookie_a: "b, c=d"
- $cookie_e: "f"
Closes #1042 on GitHub.
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Previously, when proxy_cache and keepalive were both enabled with an
HTTP/2 upstream, the second request for a cached resource could fail with
"upstream sent frame for unknown stream" error followed by "cache file
contains invalid header".
This happened because ctx->id was set to 1 in the case when no upstream
connection exists (e.g. cache hit), making the stream id check fail when
the cached response contained frames from a different stream.
The fix is to set ctx->id to 0 when there is no upstream connection,
indicating that no real stream exists, and skip the stream id validation
in this case. Also, ctx->id = 1 is now set only for new connections,
not in the shared done label.
Closes: https://github.com/nginx/nginx/issues/1101
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If a buffered request body wasn't fully sent, such as on early upstream
response or limited by flow control, unsent buffers could remain in the
input or busy chains when switching to the next upstream server. This
resulted either in the invalid request sent or a stalled connection.
The fix is to reset chains similar to ngx_http_upstream_reinit().
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A total response length with multiple ranges can be larger than the
source response size due to multipart boundary headers. This change
extends max ranges limit imposed in c2c3e3105 (1.1.2) by accounting
boundary headers. Notably, this covers suspicious requests with a
lot of small ranges that have an increased processing overhead and
are susceptible to range based amplification attacks.
The limit disables ranges as long as a total response length comes
close to the source size, additionally penalizing small size ranges
on a large source size where a processing overhead prevails, while
leaving a room for more ranges on a small source size, such that it
should not affect well-behaving applications. The limit can be
altered with the "max_ranges" directive.
Closes #988 on GitHub.
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Previously, the HTTP_HOST environment variable was constructed from the
Host request header field, which doesn't work well with HTTP/2 and
HTTP/3 where Host may be supplanted by the ":authority" pseudo-header
field per RFC 9110, section 7.2. Also, it might give an incorrect
HTTP_HOST value from HTTP/1.x requests given in the absolute form, in
which case the Host header must be ignored by the server, per RFC 9112,
section 3.2.2.
The fix is to redefine the HTTP_HOST default from a protocol-specific
value given in the $host variable. This will now use the Host request
header field, ":authority" pseudo-header field, or request line target
URI depending on request HTTP version.
Also the CGI specification (RFC 3875, 4.1.18) notes
The server SHOULD set meta-variables specific to the protocol and
scheme for the request. Interpretation of protocol-specific
variables depends on the protocol version in SERVER_PROTOCOL.
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Previously, the HTTP_HOST environment variable was constructed from the
Host request header field, which doesn't work well with HTTP/2 and
HTTP/3 where Host may be supplanted by the ":authority" pseudo-header
field per RFC 9110, section 7.2. Also, it might give an incorrect
HTTP_HOST value from HTTP/1.x requests given in the absolute form, in
which case the Host header must be ignored by the server, per RFC 9112,
section 3.2.2.
The fix is to redefine the HTTP_HOST default from a protocol-specific
value given in the $host variable. This will now use the Host request
header field, ":authority" pseudo-header field, or request line target
URI depending on request HTTP version.
Also the CGI specification (RFC 3875, 4.1.18) notes
The server SHOULD set meta-variables specific to the protocol and
scheme for the request. Interpretation of protocol-specific
variables depends on the protocol version in SERVER_PROTOCOL.
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Previously, the HTTP_HOST environment variable was constructed from the
Host request header field, which doesn't work well with HTTP/2 and
HTTP/3 where Host may be supplanted by the ":authority" pseudo-header
field per RFC 9110, section 7.2. Also, it might give an incorrect
HTTP_HOST value from HTTP/1.x requests given in the absolute form, in
which case the Host header must be ignored by the server, per RFC 9112,
section 3.2.2.
The fix is to redefine the HTTP_HOST default from a protocol-specific
value given in the $host variable. This will now use the Host request
header field, ":authority" pseudo-header field, or request line target
URI depending on request HTTP version.
Also the CGI specification (RFC 3875, 4.1.18) notes
The server SHOULD set meta-variables specific to the protocol and
scheme for the request. Interpretation of protocol-specific
variables depends on the protocol version in SERVER_PROTOCOL.
Closes: https://github.com/nginx/nginx/issues/256
Closes: https://github.com/nginx/nginx/issues/455
Closes: https://github.com/nginx/nginx/issues/912
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The module allows to use HTTP/2 protocol for proxying.
HTTP/2 proxying is enabled by specifying "proxy_http_version 2".
Example:
server {
listen 8000;
location / {
proxy_http_version 2;
proxy_pass https://127.0.0.1:8443;
}
}
server {
listen 8443 ssl;
http2 on;
ssl_certificate certs/example.com.crt;
ssl_certificate_key certs/example.com.key;
location / {
return 200 foo;
}
}
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Chunked transfer encoding, since originally introduced in HTTP/1.1
in RFC 2068, is specified to use CRLF as the only line terminator.
Although tolerant applications may recognize a single LF, formally
this covers the start line and fields, and doesn't apply to chunks.
Strict chunked parsing is reaffirmed as intentional in RFC errata
ID 7633, notably "because it does not have to retain backwards
compatibility with 1.0 parsers".
A general RFC 2616 recommendation to tolerate deviations whenever
interpreted unambiguously doesn't apply here, because chunked body
is used to determine HTTP message framing; a relaxed parsing may
cause various security problems due to a broken delimitation.
For instance, this is possible when receiving chunked body from
intermediates that blindly parse chunk-ext or a trailer section
until CRLF, and pass it further without re-coding.
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If request URI was shorter than location prefix, as after replacement
with try_files, location length was used to copy the remaining URI part
leading to buffer overread.
The fix is to replace full request URI in this case. In the following
configuration, request "/123" is changed to "/" when sent to backend.
location /1234 {
try_files /123 =404;
proxy_pass http://127.0.0.1:8080/;
}
Closes #983 on GitHub.
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The function interface is changed to follow a common approach
to other functions used to setup SSL_CTX, with an exception of
"ngx_conf_t *cf" since it is not bound to nginx configuration.
This is required to report and propagate SSL_CTX_set_ex_data()
errors, as reminded by Coverity (CID 1668589).
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The new directives add_header_inherit and add_trailer_inherit allow
to alter inheritance rules for the values specified in the add_header
and add_trailer directives in a convenient way.
The "merge" parameter enables appending the values from the previous level
to the current level values.
The "off" parameter cancels inheritance of the values from the previous
configuration level, similar to add_header "" (2194e75bb).
The "on" parameter (default) enables the standard inheritance behaviour,
which is to inherit values from the previous level only if there are no
directives on the current level.
The inheritance rules themselves are inherited in a standard way. Thus,
for example, "add_header_inherit merge;" specified at the top level will
be inherited in all nested levels recursively unless redefined below.
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Similar to map's volatile parameter, creates a non-cacheable geo variable.
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Variables contain the IANA name of the signature scheme[1] used to sign
the TLS handshake.
Variables are only meaningful when using OpenSSL 3.5 and above, with older
versions they are empty. Moreover, since this data isn't stored in a
serialized session, variables are only available for new sessions.
[1] https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml
Requested by willmafh.
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The change allows modules to use the CONNECT method with HTTP/1.1 requests.
To do so, they need to set the "allow_connect" flag in the core server
configuration.
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OCSP response in TLSv1.3 is sent in the Certificate message. This
is incompatible with pre-compression of the configured certificates.
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The change introduces an SNI based virtual server selection during
early ClientHello processing. The callback is available since
OpenSSL 1.1.1; for older OpenSSL versions, the previous behaviour
is kept.
Using the ClientHello callback sets a reasonable processing order
for the "server_name" TLS extension. Notably, session resumption
decision now happens after applying server configuration chosen by
SNI, useful with enabled verification of client certificates, which
brings consistency with BoringSSL behaviour. The change supersedes
and reverts a fix made in 46b9f5d38 for TLSv1.3 resumed sessions.
In addition, since the callback is invoked prior to the protocol
version negotiation, this makes it possible to set "ssl_protocols"
on a per-virtual server basis.
To keep the $ssl_server_name variable working with TLSv1.2 resumed
sessions, as previously fixed in fd97b2a80, a limited server name
callback is preserved in order to acknowledge the extension.
Note that to allow third-party modules to properly chain the call to
ngx_ssl_client_hello_callback(), the servername callback function is
passed through exdata.
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Found by Coverity (CID 1662016).
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The ssl_certificate_compression directive allows to send compressed
server certificates. In OpenSSL, they are pre-compressed on startup.
To simplify configuration, the SSL_OP_NO_TX_CERTIFICATE_COMPRESSION
option is automatically cleared if certificates were pre-compressed.
SSL_CTX_compress_certs() may return an error in legitimate cases,
e.g., when none of compression algorithms is available or if the
resulting compressed size is larger than the original one, thus it
is silently ignored.
Certificate compression is supported in Chrome with brotli only,
in Safari with zlib only, and in Firefox with all listed algorithms.
It is supported since Ubuntu 24.10, which has OpenSSL with enabled
zlib and zstd support.
The actual list of algorithms supported in OpenSSL depends on how
the library was configured; it can be brotli, zlib, zstd as listed
in RFC 8879.
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The gRPC module context has connection specific state, which can be lost
after request reinitialization when it comes to processing early hints.
The fix is to do only a portion of u->reinit_request() implementation
required after processing early hints, now inlined in modules.
Now NGX_HTTP_UPSTREAM_EARLY_HINTS is returned from u->process_header()
for early hints. When reading a cached response, this code is mapped
to NGX_HTTP_UPSTREAM_INVALID_HEADER to indicate invalid header format.
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