BUG/MAJOR: h2: verify early that non-http/https schemes match the valid syntax
While we do explicitly check for strict character sets in the scheme,
this is only done when extracting URL components from an assembled one,
and we have special handling for "http" and "https" schemes directly in
the H2-to-HTX conversion. Sadly, this lets all other ones pass through
if they start exactly with "http://" or "https://", allowing the
reconstructed URI to start with a different looking authority if it was
part of the scheme.
It's interesting to note that in this case the valid authority is in
the Host hedaer and that the request will only be wrong if emitted over
H2 on the backend side, since H1 will not emit an absolute URI by
default and will drop the scheme. So in essence, this is a variant of
the scheme-based attack described below in that it only affects H2-H2
and not H2-H1 forwarding:
https://portswigger.net/research/http2
As such, a simple workaround consists in just adding the following
rule in the frontend or backend, which will have for effect to
renormalize the authority in the request line according to the
concatenated version:
http-request set-uri %[url]
This patch simply adds the missing syntax checks for non-http/https
schemes before the concatenation in the H2 code. An improvement may
consist in the future in splitting these ones apart in the start
line so that only the "url" sample fetch function requires to access
them together and that all other places continue to access them
separately. This will then allow the core code to perform such checks
itself.
The patch needs to be backported as far as 2.2. Before 2.2 the full
URI was not being reconstructed so the scheme and authority part were
always dropped from H2 requests to leave only origin requests. Note
for backporters: this depends on this previous patch:
MINOR: http: add a new function http_validate_scheme() to validate a scheme
Many thanks to Tim Düsterhus for figuring that one and providing a
reproducer.
(cherry picked from commit
d2b179db54846aee11356f033dfc490978147593)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit
2ac4f553cc1ea7a8a4ff28db18fa01f04b9d84ce)
[wt: no rfc8441 in 2.3]
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit
e618d9bf5f6b48bb45aceb8e7a886c43d62b3ed5)
Signed-off-by: Willy Tarreau <w@1wt.eu>
Gbp-Pq: Name 2.2-0002-BUG-MAJOR-h2-verify-early-that-non-http-https-scheme.patch
MINOR: http: add a new function http_validate_scheme() to validate a scheme
While http_parse_scheme() extracts a scheme from a URI by extracting
exactly the valid characters and stopping on delimiters, this new
function performs the same on a fixed-size string.
(cherry picked from commit
adfc08e717db600c3ac44ca8f3178d861699b67c)
[wt: context adj]
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit
073e9c9c10897a05117f29cb9d3ebdbc13ff03b5)
[wt: context adj]
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit
0fb53c3c025fb158c51c515532f3f52bb2abcdea)
Signed-off-by: Willy Tarreau <w@1wt.eu>
Gbp-Pq: Name 2.2-0001-MINOR-http-add-a-new-function-http_validate_scheme-t.patch
[PATCH] BUG/MINOR: tcpcheck: Update .health threshold of agent inside an agent-check
If an agent-check is configured for a server, When the response is parsed,
the .health threshold of the agent must be updated on up/down/stopped/fail
command and not the threshold of the health-check. Otherwise, the
agent-check will compete with the health-check and may mark a DOWN server as
UP.
This patch should fix the issue #1176. It must be backported as far as 2.2.
(cherry picked from commit
24ec9434271345857b42cc5bd9c6b497ab01a7e4)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit
789bbdc88d7ffe8f520532efb18148ea52ede4ca)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
Gbp-Pq: Name 0001-BUG-MINOR-tcpcheck-Update-.health-threshold-of-agent.patch
haproxy (2.2.9-2+deb11u6) bullseye-security; urgency=high
* Non-maintainer upload by the Security Team.
* BUG/MAJOR: http: reject any empty content-length header value
(CVE-2023-40225) (Closes: #
1043502)
* MINOR: ist: add new function ist_find_range() to find a character range
* MINOR: ist: Add istend() function to return a pointer to the end of the
string
* MINOR: http: add new function http_path_has_forbidden_char()
* MINOR: h2: pass accept-invalid-http-request down the request parser
* BUG/MINOR: h1: do not accept '#' as part of the URI component
(CVE-2023-45539)
* BUG/MINOR: h2: reject more chars from the :path pseudo header
* REGTESTS: http-rules: verify that we block '#' by default for
normalize-uri
* DOC: clarify the handling of URL fragments in requests
[dgit import unpatched haproxy 2.2.9-2+deb11u6]