Re: [exim] Stacking or renaming headers
On 19/03/2023 17:42, Ian Z via Exim-users wrote: X-Original-Foo: the-ur-foo Foo: the-no-longer-ur-foo I am not thinking of a header with addresses here, so Exim's rewrite mechanism doesn't apply. Is there a "best" or "accepted" way to do this? In particular, can I do this in an ACL: add_header = X-Original-Foo: $h_foo: set acl_m_original_foo = $h_foo: remove_header = Foo add_header = Foo: the-no-longer-$acl_m_original_foo Yes. And you don't need the temporary variable. (I am not sure if the last add_header trum^H^H^H^Hoverrides the preceding remove_header.) No. And if not in ACL, can I do something similar in a router or transport? Yes, both. -- Cheers, Jeremy -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
Re: [exim] Single quotes and transport_filter
On 19/03/2023 17:22, Ian Z via Exim-users wrote:
Chapter 24 documents the transport_filter option. An example is given
where the argv vector for the command comes from an expansion:
transport_filter = '/bin/cmd${if eq{$host}{a.b.c}{1}{2}}'
This runs the command /bin/cmd1 if the host name is a.b.c, and
/bin/cmd2 otherwise. If double quotes had been used, they would have
been stripped by Exim when it read the option’s value. When the
value is used, if the single quotes were missing, the line would be
split into two items, /bin/cmd${if and eq{$host}{a.b.c}{1}{2}, and
an error would occur when Exim tried to expand the first one.
I have two problems grokking this:
- I can find no other place in the spec where it is specifically
explained what single quotes do, as opposed to double quotes.
Yup; this could be better.
In the coding I find an explanatory comment:
/* Split the command up into arguments terminated by white space. Lose
trailing space at the start and end. Double-quoted arguments can contain \\ and
\" escapes and so can be handled by the standard function; single-quoted
arguments are verbatim. Copy each argument into a new string. */
- In Section 29.3 on pipe commands (which are supposedly expanded the
same way), there is this example:
command = /some/path ${if eq{$local_part}{postmaster}{xx}{yy}}
will not work, because the expansion item gets split between
several arguments. You have to write
command = /some/path "${if eq{$local_part}{postmaster}{xx}{yy}}"
So why are double quotes OK here?
The difference is an artefact of the option-handling described in
Ch.6 Sec.17 :- if an option value *starts* with a doublequote
then it must end with one (and, implicitly, they get stripped
at that processing phase. The pipe example does not.
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Cheers,
Jeremy
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[exim] Stacking or renaming headers
By "Stacking", I mean the common pattern where Foo: the-ur-foo is rewritten into X-Original-Foo: the-ur-foo Foo: the-no-longer-ur-foo I am not thinking of a header with addresses here, so Exim's rewrite mechanism doesn't apply. Is there a "best" or "accepted" way to do this? In particular, can I do this in an ACL: add_header = X-Original-Foo: $h_foo: set acl_m_original_foo = $h_foo: remove_header = Foo add_header = Foo: the-no-longer-$acl_m_original_foo (I am not sure if the last add_header trum^H^H^H^Hoverrides the preceding remove_header.) And if not in ACL, can I do something similar in a router or transport? -- Ian -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
[exim] Single quotes and transport_filter
Chapter 24 documents the transport_filter option. An example is given
where the argv vector for the command comes from an expansion:
transport_filter = '/bin/cmd${if eq{$host}{a.b.c}{1}{2}}'
This runs the command /bin/cmd1 if the host name is a.b.c, and
/bin/cmd2 otherwise. If double quotes had been used, they would have
been stripped by Exim when it read the option’s value. When the
value is used, if the single quotes were missing, the line would be
split into two items, /bin/cmd${if and eq{$host}{a.b.c}{1}{2}, and
an error would occur when Exim tried to expand the first one.
I have two problems grokking this:
- I can find no other place in the spec where it is specifically
explained what single quotes do, as opposed to double quotes.
- In Section 29.3 on pipe commands (which are supposedly expanded the
same way), there is this example:
command = /some/path ${if eq{$local_part}{postmaster}{xx}{yy}}
will not work, because the expansion item gets split between
several arguments. You have to write
command = /some/path "${if eq{$local_part}{postmaster}{xx}{yy}}"
So why are double quotes OK here?
--
Ian
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Re: [exim] Tainted search query is not properly quoted
On 19/03/2023 10:58, Odhiambo Washington via Exim-users wrote:
warn condition= ${if eq {$acl_m_greyexpiry}{} {1}}
set acl_m_dontcare = ${lookup sqlite {INSERT INTO greylist \
VALUES ( '$acl_m_greyident', \
'${eval10:$tod_epoch+300}', \
'${quote_sqlite:$sender_host_address}', \
'${quote_sqlite:$sender_helo_name}' );}}
It's not obvious to me what I haven't quoted properly.
The only obvious element is your $acl_m_greyindent, since $tod_epoch
shouldn't be derived from wire information. The debug "expand" channel
would show you for definite.
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[exim] Tainted search query is not properly quoted
I am missing a little something in my config for greylisting.
Exim-4.96 here.
2023-03-19 13:53:21 1pdqf6-000LgR-0z tainted search query is not properly
quoted (ACL warn, /etc/exim/exim-greylist.conf.inc 124): INSERT INTO
greylist VALUES ( 'ecpeUlXRs7cHPrkaiW5j', '1679223501', '74.6.132.40', '
sonic306-1.consmr.mail.bf2.yahoo.com' );
The relevant config causing this:
warn condition= ${if eq {$acl_m_greyexpiry}{} {1}}
set acl_m_dontcare = ${lookup sqlite {INSERT INTO greylist \
VALUES ( '$acl_m_greyident', \
'${eval10:$tod_epoch+300}', \
'${quote_sqlite:$sender_host_address}', \
'${quote_sqlite:$sender_helo_name}' );}}
It's not obvious to me what I haven't quoted properly.
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Best regards,
Odhiambo WASHINGTON,
Nairobi,KE
+254 7 3200 0004/+254 7 2274 3223
"Oh, the cruft.", egrep -v '^$|^.*#' ¯\_(ツ)_/¯ :-)
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