Willy Tarreau 44c5ff69ac MEDIUM: vars: make the var() sample fetch function really return type ANY ... A long-standing issue was reported in issue #1215. In short, var() was initially internally declared as returning a string because it was not possible by then to return "any type". As such, users regularly get trapped thinking that when they're storing an integer there, then the integer matching method automatically applies. Except that this is not possible since this is related to the config parser and is decided at boot time where the variable's type is not known yet. As such, what is done is that the output being declared as type string, the string match will automatically apply, and any value will first be converted to a string. This results in several issues like: http-request set-var(txn.foo) int(-1) http-request deny if { var(txn.foo) lt 0 } not working. This is because the string match on the second line will in fact compare the string representation of the variable against strings "lt" and "0", none of which matches. The doc says that the matching method is mandatory, though that's not the case in the code due to that default string type being permissive. There's not even a warning when no explicit match is placed, because this happens very deep in the expression evaluator and making a special case just for "var" can reveal very complicated. The set-var() converter already mandates a matching method, as the following will be rejected: ... if { int(12),set-var(txn.truc) 12 } while this one will work: ... if { int(12),set-var(txn.truc) -m int 12 } As such, this patch this modifies var() to match the doc, returning the type "any", and mandating the matching method, implying that this bogus config which does not work: http-request set-var(txn.foo) int(-1) http-request deny if { var(txn.foo) lt 0 } will need to be written like this: http-request set-var(txn.foo) int(-1) http-request deny if { var(txn.foo) -m int lt 0 } This *will* break some configs (and even 3 of our regtests relied on this), but except those which already match string exclusively, all other ones are already broken and silently fail (and one of the 3 regtests, the one on FIX, was bogus regarding this). In order to fix existing configs, one can simply append "-m str" after a "var()" in an ACL or "if" expression: http-request deny unless { var(txn.jwt_alg) "ES" } must become: http-request deny unless { var(txn.jwt_alg) -m str "ES" } Most commonly, patterns such as "le", "lt", "ge", "gt", "eq", "ne" in front of a number indicate that the intent was to match an integer, and in this case "-m int" would be desired: tcp-response content reject if ! { var(res.size) gt 3800 } ought to become: tcp-response content reject if ! { var(res.size) -m int gt 3800 } This must not be backported, but if a solution is found to at least detect this exact condition in the generic expression parser and emit a warning, this could probably help spot configuration bugs. Link: https://www.mail-archive.com/haproxy@formilux.org/msg41341.html Cc: Christopher Faulet <cfaulet@haproxy.com> Cc: Tim Düsterhus <tim@bastelstu.be>		2021-11-02 17:28:43 +01:00
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es256-public.pem
es384-public.pem
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jws_verify.vtc	MEDIUM: vars: make the var() sample fetch function really return type ANY	2021-11-02 17:28:43 +01:00
rsa-public.pem