htx_replace_blk_value() is buggy when a defrag is performed. It only happens
on data expension. But in that case, because a defragmentation is performed,
the blocks data are moved and old data of the updated block are no longer
accessible.
To fix the bug, we now use a chunk to temporarily copy the new data of the
block. This way we can safely perform the HTX defragmentation and then
recopy the data from the chunk to the HTX message.
It is theorically possible to hit this bug but concretly it is pretty hard.
This patch should be backported to all stable versions.
Check the channels buffers size on release before trying to offer it to
waiting entities. Only normal buffers must be considered. This will be
mandatory when the large buffers support on channels will be added.
When a message payload is parsed, it is possible to swap buffers. We must
only take care both buffers have same size. It will be mandatory when the
large buffers support on channels will be added.
Just like the previous commit, we must take care to never swap buffers of
different size when data are exchanged between an applet and a SC. it will
be mandatory when the large buffers support on channels will be added.
Today, it is useless to check the buffers size before performing a 0-copy in
muxes when data are sent, but it will be mandatory when the large buffers
support on channels will be added. Indeed, muxes will still rely on normal
buffers, so we must take care to never swap buffers of different size.
When the compression is performed, a trash chunk is used. So be sure to
never compression more data than the trash size. Otherwise the commression
could fail. Today, this cannot happen. But with the large buffers support on
channels, it could be an issue.
Note that this part should be reviewed to evaluate if we should use a larger
chunk too to perform the compression, maybe via an option.
It is not a bug fix, because there is no way to hit the issue for now. But
there is nothing preventing a loop of synchronous sends in process_stream().
Indead, when a synchronous send is successfully performed, we restart the
SCs evaluation and at the end another synchronous send is attempted. So with
an endpoint consuming data bit by bit or with a filter fowarding few bytes
at each call, it is possible to loop for a while in process_stream().
Because it is not expected, we now limit the number of synchronous send per
wakeup to two calls. In a nominal case, it should never be more. This commit
is mandatory to be able to handle large buffers on channels
There is no reason to backport this commit except if the large buffers
support on channels are backported.
When the response payload is stored in the cache, we can avoid to use a
trash chunk as temporary space area before copying everything in the cache
in one call. Instead we can directly write each HTX block in the cache, one
by one. It should not be an issue because, most of time, there is only one
DATA block.
This commit depends on "BUG/MEDIUM: shctx: Use the next block when data
exactly filled a block".
The call to init_buffer() during the worker startup may fail. In that case,
an error message is displayed but the error was not properly handled. So
let's add the proper check and exit on error.
At many places, we rely on global.tune.bufsize value instead of using the buffer
size. For now, it is not a problem. But if we want to be able to deal with
buffers of different sizes, it is good to reduce as far as possible dependencies
on the global value. most of time, we can use b_size() or c_size()
functions. The main change is performed on the error snapshot where the buffer
size was added into the error_snapshot structure.
Fix two issues in JWE token processing:
- Replace memcmp() with CRYPTO_memcmp() for authentication tag
verification in build_and_check_tag() to prevent timing
side-channel attacks. Also add a tag length validation check
before the comparison to avoid potential buffer over-read when
the decoded tag length doesn't match the expected HMAC half.
- Remove unreachable break statement after JWE_ALG_A256GCMKW case
in decrypt_cek_aesgcmkw().
sc_have_buff(), sc_need_buff(), sc_have_room() and sc_need_room() are
related to the buffer's channel. So we can move them in sc_strm.h header
file. In addition, this will be mandatory for the next commit.
During the message analysis, we must take care to stop wait for the message
body if an error was reported on client side or an abort was detected with
abort-on-close configured (by default now).
The bug was introduced when the "wait-for-body" action was added. Only the
producer state was tested. So, when we were waiting for the request payload,
there was no issue. But when we were waiting for the response payload, error
or abort on client side was not considered.
This patch should be backported to all stable versions.
When the hot list was removed in 3.0, a regression was introduced.
Theorically, it is possible to override data in a block when new data are
appended. It happens when data are copied. If the data size is a multiple of
the block size, all data are copied and the last used block is full. But
instead of saving a reference on the next block as the restart point for the
next copies, we keep a reference on the last full one. On the next read, we
reuse this block and old data are crushed. To hit the bug, no new blocks
should be reserved between the two data copy attempts.
Concretely, for now, it seems not possible to hit the bug. But with a block
size set to 1024, if more than 1024 bytes are reseved, with a first copy of
1024 bytes and a second one with remaining data, data in the first block
will be crushed.
So to fix the bug, the reference of the last block used to write data (which
is in fact the next one to use to perform the next copy) is only updated
when a block is full. In that case the next block is used.
This patch should be backported as far as 3.0 after a period of observation.
Since the legacy HTTP code was removed, the global and thread-local buffers,
tmpbuf and zbuf, are no longer used. So let's removed them.
This could be backported, theorically to all supported versions. But at
least it could be good to do so as far as 3.2 as it saves 2 buffers
per-thread.
This bug is quite old. When the length of the first DATA block is computed,
the offset is used instead of the block length minus the offset. It is only
used with random forwarding and there is a test just after to prevent any
issue, so there is no effect.
It could be backported to all stable versions.
Handshakes events were not properly decoded. Only send errors were decoded
as expected, other events were reported with a '-'. It is now fixes.
This patch could be backported as far as 3.2.
The previous fix was wrong. When shut flags are tested for legacy applets,
to know if the I/O handler can be called or not, we must be sure shut for
reads and for writes are both set to skip the applet I/O handler.
This bug introduced regression, at least for the peer applet and for the DNS
applet.
This patch must be backported with abc1947e1 ("BUG/MEDIUM: applet: Fix test
on shut flags for legacy applets"), so as far as 3.0.
If a producer tries to send data via the fast-forward mechanism while the
message is in an unexpected state from the consumer point of view, the
fast-forward is now disabled. Concretely, we now take care that the message
is in its data/tunnel stage to proceed in h1_nego_ff().
By disabling fast-forward in that case, we will automatically fall back on
the regular sending path and be able to handle the error in h1_snd_buf().
This patch should be backported as far as 3.0
If is illegal to send data if the stream is already closed. The case is
properly handled when data are sent via snd_buf(), by draining the data. But
it was still possible to process these data via nego_ff().
So, in this patch, both for the H2 and QUIC multiplexers, the fast-forward
is disabled if the stream is closed and nothing is performed. Doing so, we
will automatically fall back on the regular sending path and be able to
drain data in snd_buf().
Thanks to Mike Walker for his investigation on the subject.
This patch should be backported as far as 3.0.
Remove extra quote in feature cmd used to test SSL compatibility with
set_ssl_cafile QUIC regtest. Due to this syntax error, the test was
never executed.
No need to backport.
HTTP/3 CONNECT transcoding is not properly implemented on the frontend
side. Neither tunnel mode of application nor extended connect are
currently functional.
Clarify this situation by rejecting any CONNETC attempts on the frontend
side. The stream is thus now closed via a RESET_STREAM with error code
REQUEST_REJECTED.
This should be backported to every stable versions.
This reverts commit 235e8f1afd.
Prior to the above commit, snd_buf callback for QUIC MUX was able to
deal with data even after stream closure. The excess was simply
discarded, as no STREAM frame can be emitted after FIN/RESET_STREAM.
This code was later removed and replaced by a BUG_ON() to ensure snd_buf
is never called after stream closure.
However, this approach is too strict. Indeed, there is nothing in the
haproxy stream architecture which forbids this scheduling, in part
because QUIC MUX is the sole responsible of the stream closure. As such,
it is preferable to revert to the old code to prevent any triggering of
a BUG_ON() failure.
Note that nego_ff does not implement data draining if called after
stream closure. This will be done in a future patch.
Thanks to Mike Walker for his investigation on the subject.
This must be backported up to 2.8.
This is a follow up to b6bdb2553 ("MEDIUM: backend: make "balance random"
consider req rate when loads are equal")
In the above patch, we used the global sess_per_sec metric to choose which
server we should be using. But the original intent was to use the per
thread group statistic.
No backport needed, the previous patch already improved the situation in
3.3, so let's not take the risk of breaking that.
ssl-f-use lines tries to load a crt file, but the "crt" keyword is not
mandatory. That could lead to crtlist_load_crt() being called with a
NULL path, and trying to do a stat.
In this particular case we don't need to try anything and it's better to
leave with an actual error.
Must be backported as far as 3.2.
crtlist_load_crt() in post_section_frontend_crt_init() won't give
details about the line being parsed, this should be done by the caller.
Modify post_section_frontend_crt_init() to ouput the right error format.
Must be backported to 3.2.
In post_section_frontend_crt_init(), the crt_entry is populated by the
ssl_conf fromt the cfg_crt_node. On error path, the crt_list is
completely freed, including the ssl_conf structure. But the ssl_conf
structure was already freed when freeing the cfg_crt_node.
Fix the issue by doing a crtlist_dup_ssl_conf(n->ssl_conf) in the
crtlist_entry instead of an assignation.
Fix issue #3268.
Need to be backported as far as 3.2. The previous patch which adds the
crtlist_dup_ssl_conf() declaration is needed.
The pools memory usage calculation was done using ints by default, making
it harder to identify large ones. Let's switch to unsigned long for the
size calculations.
Add unlikely() hints on error paths in init, conv and fetch functions.
Remove unnecessary zero-initialization of local buffers that are
always written before use. Fix indentation in da_haproxy_checkinst()
and remove unused loop variable initialization.
Precompute the maximum header name length from the atlas evidence
headers at init and hot-reload time. Use it in da_haproxy_fetch() to
skip headers early that cannot match any known DeviceAtlas evidence
header, avoiding unnecessary string copies and comparisons.
Add the struct header_evidence_entry definition to the dummy dac.h
to accommodate the ongoing deviceatlas module update which now
iterates over atlas header_priorities to precompute maxhdrlen.
The struct was already referenced by struct da_atlas but lacked
a definition in the dummy header.
Increase DA_MAX_HEADERS from 24 to 32 and hbuf from 24 to 64 to
accommodate current DeviceAtlas data files which may use more headers
and longer header names.
Check the return value of da_atlas_getproptype() and skip the property
on failure instead of using an uninitialized proptype. Also remove the
unnecessary pprop pointer indirection, using prop directly.
When hot-reloading the atlas in da_haproxy_checkinst(), the configured
cache_size was not applied to the new instance, causing it to use the
default value.
This should be backported to lower branches.
da_fini() was called unconditionally in deinit_deviceatlas() even when
da_init() was never called. Move it inside the daset check. Also remove
the erroneous shm_unlink() call which could affect the dadwsch shared
memory used by the scheduling process.
This should be backported to lower branches.
In da_haproxy_checkinst(), when da_atlas_compile() failed, the cnew
buffer was leaked. Add a free(cnew) in the else branch.
This should be backported to lower branches.
In da_haproxy_checkinst(), base[0] was checked before acquiring the
lock but not re-checked after. Another thread could have already
processed the reload between the initial check and the lock
acquisition, leading to a race condition.
This should be backported to lower branches.
In da_haproxy_fetch(), vlen was set from v.len (the raw header value
length) instead of the truncated copy length. Also the cookie-specific
vlen calculation used an incorrect subtraction instead of the actual
extracted cookie value length (pl) returned by
http_extract_cookie_value().
This should be backported to lower branches.
The user-agent string copy had an off-by-one error: the buffer size
limit did not account for the null terminator, and the memcpy length
used i-1 which truncated the last character of the user-agent string.
This should be backported to lower branches.
When da_atlas_compile() or da_atlas_open() failed in init_deviceatlas(),
atlasimgptr was leaked and da_fini() was never called. Also add a NULL
check on strdup() for the default cookie name with proper cleanup of
the atlas and image pointer on failure.
This should be backported to lower branches.
Add missing NULL checks after strdup() for the json file path in
da_json_file() and the cookie name in da_properties_cookie().
This should be backported to lower branches.
da_log_level() and da_cache_size() were missing a return -1 on error,
causing fall-through to the normal return 0 path when invalid values
were provided.
This should be backported to lower branches.
More and more often, core dumps retrieved on systems that build with
-fPIE by default are becoming unexploitable. Even functions and global
symbols get relocated and gdb cannot figure their final position.
Ironically the post_mortem struct lying in its own section that was
meant to ease its finding is not exempt from this problem.
The only remaining way is to inspect the core to search for the
post-mortem magic, figure its offset from the file and look up the
corresponding virtual address with objdump. This is quite a hassle.
This patch implements a simple utility that opens a 64-bit core dump,
scans the program headers looking for a data segment which contains
the post-mortem magic, and prints it on stdout. It also places the
"pm_init" command alone on its own line to ease copy-pasting into the
gdb console. With this, at least the other commands in this directory
work again and allow to inspect the program's state. E.g:
$ ./getpm core.57612
Found post-mortem magic in segment 5:
Core File Offset: 0xfc600 (0xd5000 + 0x27600)
Runtime VAddr: 0x5613e52b6600 (0x5613e528f000 + 0x27600)
Segment Size: 0x28000
In gdb, copy-paste this line:
pm_init 0x5613e52b6600
It's worth noting that the program has so few dependencies that it even
builds with nolibc, allowing to upload a static executable into containers
being debugged and lacking development tools and compilers. The build
procedure is indicated inthe source code.
