On 4/20/23 13:14, Alexeyяр Gruzdov wrote:
Tell me please If I right understood I could to get answer like
"name=value" from my ACL ext script, instead of "OK" or "ERR", right?
Not "instead", but in addition to either OK or ERR.
Unfortunately, our documentation of the external ACL helper protocol has
been hidden in a transition to GitHub Pages (or I cannot find it), but
you can use the old wiki sources at the URL below to learn about that
protocol:
https://github.com/squid-cache/squid-cache.github.io/blob/fa00274/Features/AddonHelpers.md#access-control-acl
General information about from-helper annotations:
https://github.com/squid-cache/squid-cache.github.io/blob/fa00274/Features/AddonHelpers.md#keyvalue-pairs-kv-pairs-format
And does it means - I could to get answer depends from what users
authorises in to proxy.
For example:
If user "Jon" - the my ACL will check the policy in the DB and send
answer like "proxy=g1" to squid, or if user is "Jack" - answer will be
like "proxy=all"
Yes, what annotation(s) the helper script sends to Squid (and why) is up
to you. Please note, however, that annotation _names_ not ending with an
underscore (_) are officially reserved for Squid use. I would be
especially worried about using single, simple, generic words like "proxy"!
and I will have ACL for this
acl proxy_g1_marked.acl note proxy g1
acl proxy_all_marked.acl note proxy all
will that correct ?
Yes. An no transaction_annotation ACLs.
HTH,
Alex.
чт, 20 апр. 2023 г. в 19:50, Alex Rousskov
<rousskov@xxxxxxxxxxxxxxxxxxxxxxx
<mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx>>:
On 4/20/23 10:54, Alexeyяр Gruzdov wrote:
> The cpu is around 100% even no any requests is going....
Then the problem is most likely in your script. Foe example, the script
actively doing something while there are no Squid requests to work on
(instead of blocking while waiting for the next Squid request).
> For now I left just one cache_peer in configuration and got the
new error:
>
> commBind Cannot bind socket FD 28 to [::]: (13) Permission denied
Could be one of the misconfigurations discussed at
https://wiki.squid-cache.org/Features/SmpScale#cannot-bind-socket-fd-nn-to--13-permission-denied <https://wiki.squid-cache.org/Features/SmpScale#cannot-bind-socket-fd-nn-to--13-permission-denied>
HTH,
Alex.
> чт, 20 апр. 2023 г. в 17:21, Alex Rousskov:
>
> On 4/20/23 04:23, Alexeyяр Gruzdov wrote:
>
> > cache_peer peerG1.com parent 40001 0 no-query no-digest
name=peerG1
> >
> > external_acl_type ext_proxy_g1_type %LOGIN %DST
/usr/local/bin/g1.py
> >
> > acl proxy_g1_ext_mark_acl ext_proxy_g1_type
> >
> > acl proxy_g1_ext_marked_acl annotate_transaction proxy=g1
> >
> > acl proxy_peerG1_acl note proxy g1
> >
> > http_access deny
proxy_g1_ext_mark_acl proxy_g1_ext_marked_acl !all
> > .....
> > others http_access rules
> >
> > And this above works.
>
> Glad to hear that. ( If others are going to use the above as
a guiding
> example, I would recommend naming these ACLs very
differently, but that
> is not important to Squid. )
>
>
> > BUT
> > I am worried about why this my external script for ACL type
> loads the
> > one of core of CPU to 100%.....???
>
> External ACL caching aside, the script will be contacted once
for every
> Squid transaction. Does your script CPU usage go down to zero
when
> there
> is no traffic? If not, then there is a bug in the script itself.
>
> If you use the script from the command line, without Squid,
does it
> consume a lot of CPU and/or take a lot of time per fake
query? You can
> adjust the script to log the real query (when the script is
used by
> Squid), so that you can easily replicate that query when
running the
> script without Squid...
>
> The cache key in your case is (the expansion of) "%LOGIN
%DST". It is
> enabled by default IIRC. Look for "cache" related options at
> http://www.squid-cache.org/Doc/config/external_acl_type/
<http://www.squid-cache.org/Doc/config/external_acl_type/>
> <http://www.squid-cache.org/Doc/config/external_acl_type/
<http://www.squid-cache.org/Doc/config/external_acl_type/>>
>
>
> > ( I used three of workers in config,
> > but I can see a six process called like my external helper
> script, looks
> > like squid runs x2 process for external ACL )
>
> See external_acl_type children-* options:
> http://www.squid-cache.org/Doc/config/external_acl_type/
<http://www.squid-cache.org/Doc/config/external_acl_type/>
> <http://www.squid-cache.org/Doc/config/external_acl_type/
<http://www.squid-cache.org/Doc/config/external_acl_type/>>
>
> In most environments, I recommend setting all three of them
to the same
> value. Please note that these options are not SMP-aware
(yet), so Squid
> will _not_ divide their values by the number of workers and
give each
> worker as many children as you state in squid.conf.
>
>
> > Because if I will put the one more group of users (that
must to use
> > another cache_peer ) - I will need to create one more external
> script
> > that will making to check an existed users from an
other DB table
>
> Once you get the basic setup above working for one group to your
> satisfaction, I would recommend migrating from (one script
and one
> matching annotate_transaction ACL) per group to a single
script for all
> groups. That single external ACL script will send the right
> annotation(s) to Squid.
>
>
> HTH,
>
> Alex.
>
>
> > ср, 19 апр. 2023 г. в 22:39, Alex Rousskov:
> >
> > On 4/19/23 13:30, Alexeyяр Gruzdov wrote:
> >
> > > cache_peer peerG1.com parent 40001 0 no-query no-digest
> name=peerG1
> >
> > > external_acl_type ext_proxy_g1_type %LOGIN %DST
> /usr/local/bin/g1.py
> >
> > > acl proxy_g1_ext_acl ext_proxy_g1_type
> >
> > OK. I assume that /usr/local/bin/g1.py will only match
users that
> > should
> > go to cache_peer called peerG1.
> >
> >
> > > acl proxy_g1_ext_acl_mark annotate_transaction
proxy=g1
> >
> > Please note that the name of this annotate_transaction
ACL --
> > "proxy_g1_ext_acl_mark" -- implies a relationship to the
> external ACL
> > named "proxy_g1_ext_acl", but there is no such
relationship.
> Squid does
> > not care about ACL names, but this naming problem may
indicate a
> > misunderstanding. To follow your naming scheme, this ACL
> should be
> > called something like "proxy_g1_mark_acl" or
> "mark_for_proxy_g1_acl".
> >
> >
> > > acl proxy_peerG1_acl note proxy g1
> >
> > OK. FWIW, a more consistent ACL name would have been
> > "proxy_g1_marked_acl" or "marked_for_proxy_g1_acl". Again,
> Squid does
> > not really care about these names, so use whatever you
think is
> > consistent/meaningful/etc.
> >
> >
> > > http_access deny proxy_g1_ext_acl !all
> >
> > This line has no (positive) effect. Squid will
evaluate the
> external
> > ACL, but since the rule, as a whole, will never match
due to
> "!all",
> > and
> > since the external ACL has no (relevant) side effects, you
> can just
> > delete this line from your configuration.
> >
> > Needless to say, if you delete this line, then
> proxy_g1_ext_acl will be
> > unused, which should tell you that this configuration
is not
> doing what
> > you want. See below for a fix recommendation.
> >
> >
> > > http_access deny proxy_g1_ext_acl_mark !all
> >
> > This line will mark _all_ transactions. You only want
to mark
> > transactions that also matched proxy_g1_ext_acl. That
"b only
> if a"
> > logic is accomplished by using _both_ ACLs in the same
rule:
> >
> > http_access deny proxy_g1_ext_acl
proxy_g1_ext_acl_mark !all
> >
> > With the above http_access rule (instead of the
earlier two),
> Squid
> > will
> > evaluate the external ACL, and, if it matches, Squid will
> also evaluate
> > the annotation-setting ACL. The whole rule will then be
> rejected due to
> > "!all", but not until it annotates the transaction (if the
> external ACL
> > matches). Again, in this sketch, we are using this
rule for its
> > annotation side effect only.
> >
> >
> > > And this works like I need now....
> >
> > AFAICT, if the tests indicate that this configuration
works,
> then the
> > tests are broken. IMHO, you should fix the tests
(while you
> have a
> > broken configuration that can be used to test the
tests) before
> > proceeding with the configuration fix.
> >
> >
> > HTH,
> >
> > Alex.
> > P.S. Please keep this email thread on squid-users
instead of
> responding
> > to me personally.
> >
> >
> >
> >
> > > ср, 19 апр. 2023 г. в 21:01, Alexeyяр Gruzdov:
> > >
> > > so, ok - Lets limit just to one cache peer and
one single
> > ACL (just
> > > to understand the logic):
> > >
> > > cache_peer peerG1.com parent 40001 0 no-query
no-digest
> > name=peerG1
> > >
> > > external_acl_type ext_proxy_g1_type %LOGIN %DST
> > > /usr/local/bin/g1.py (this will answer "OK"
or "ERR",
> > depends if
> > > user consists in DB)
> > >
> > > acl proxy_g1_ext_acl
> ext_proxy_g1_type annotate_transaction
> > > proxy=g1 (If I right understood here is a key
point
> of how
> > to add
> > > the tag to transaction related with user)
> > > acl proxy_peerG1_acl note proxy g1 (here we
create
> the ACL
> > based
> > > on the tag and this is fast ACL yet and we
should to
> use it in
> > > cache_peer_access)
> > >
> > >
> > > http_access deny proxy_g1_ext_acl !all
> > > ......<others http access rules>
> > >
> > >
> > > cache_peer_access peerG1 allow proxy_peerG1_acl
> > > cache_peer_access peerG1 deny all
> > >
> > > Is that correct ?
> > >
> > > вт, 18 апр. 2023 г. в 23:44, Alex Rousskov
> > > <rousskov@xxxxxxxxxxxxxxxxxxxxxxx
<mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx>
> <mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx
<mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx>>
> > <mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx
<mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx>
> <mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx
<mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx>>>
> > > <mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx
<mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx>
> <mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx
<mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx>>
> > <mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx
<mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx>
> <mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx
<mailto:rousskov@xxxxxxxxxxxxxxxxxxxxxxx>>>>>:
> > >
> > > On 4/18/23 11:41, Alexeyяр Gruzdov wrote:
> > >
> > > > Could you explain me how the annotation
transaction
> > works and
> > > how it
> > > > related to acl that I could to use with
cache_peers
> > >
> > > Transactions have a (possibly empty) set of
name=value
> > annotations.
> > >
> > > During Squid configuration time, Squid
parses all ACL
> > > declarations in
> > > your configuration file. When Squid parses an
> > > annotation_transaction ACL
> > > declaration, Squid remembers what transaction
> annotation
> > to add
> > > in the
> > > future, [every time] when that ACL is
evaluated (e.g.,
> > used in
> > > http_access rule that Squid reaches during
transaction
> > processing).
> > >
> > > When evaluated, an "annotation_transaction"
ACL simply
> > adds the
> > > previously configured annotation to the current
> > transaction and
> > > returns
> > > a "yes, this transaction matches" result.
> > >
> > > When evaluated, a "note" ACL returns a
"yes, this
> transaction
> > > matches"
> > > result if and only if the current transaction
> already has the
> > > matching
> > > annotation. This ACL does not modify the set of
> transaction
> > > annotations.
> > >
> > > The combination of annotate_transaction and
note ACLs
> > allows you to
> > > annotate a transaction at one time and check
> previously set
> > > transaction
> > > annotations at another time. The timing and
> meaning of those
> > > annotations
> > > are up to you.
> > >
> > >
> > > > ok! Lets look to my case example:
> > >
> > > > cache_peer peerG1.com parent 40001 0
no-query
> no-digest
> > > name=peerG1 round-robin
> > >
> > > > cache_peer_access peerG1 allow
proxy_peerG1_acl
> > > > cache_peer_access peerG1 allow
proxy_all_acl
> > > > cache_peer_access peerG1 deny all
> > >
> > > > acl proxy_peerG1_acl proxy_auth
> "../users.peerG1.txt"
> > > > acl proxy_all_acl proxy_auth
"../users.all.txt"
> > >
> > > [ I added the missing "acl " directive to the
> above ACL
> > > declarations and
> > > stripped rules for two out of three
cache_peers ]
> > >
> > > As you know, the above cache_peer_access
> configuration is not
> > > supported
> > > because it uses "slow" proxy_auth ACLs in
> cache_peer_access
> > > directives
> > > that only support "fast" ACLs. It does not
matter
> (to me),
> > > whether the
> > > above appears to "work" in some
environments. YMMV.
> > >
> > > To fix this problem, we can use http_access
rules to
> > essentially
> > > remember proxy_auth evaluation results (at
http_access
> > > evaluation time)
> > > as transaction annotations. Here is an untested
> sketch that
> > > omits other
> > > (important but irrelevant here) http_access
rules
> and assumes
> > > that these
> > > sketched http_access rules _are_ evaluated:
> > >
> > > # if proxy_peerG1_acl matches, evaluate
> mark_for_peerG1
> > > http_access deny proxy_peerG1_acl
> mark_for_peerG1 !all
> > >
> > > # if proxy_all_acl matches, evaluate
> mark_for_all_peers
> > > http_access deny proxy_all_acl
> mark_for_all_peers !all
> > >
> > >
> > > Now we can use those remembered proxy_... acl
> evaluation
> > results
> > > (i.e.
> > > we can check for the matching annotations) in
> > cache_peer_access
> > > rules:
> > >
> > > cache_peer_access peerG1 allow
marked_for_peerG1
> > > cache_peer_access peerG1 allow
> marked_for_all_peers
> > > cache_peer_access peerG1 deny all
> > >
> > >
> > > where the new ACLs mentioned above are
declared along
> > these lines:
> > >
> > > acl mark_for_peerG1 annotate_transaction
> for_peer_=G1
> > > acl mark_for_all_peers annotate_transaction
> > for_all_peers_=true
> > >
> > > acl marked_for_peerG1 note for_peer_ G1
> > > acl marked_for_all_peers note
for_all_peers_ true
> > >
> > > This can probably be simplified further by
using
> > for_peer_=ALL
> > > instead
> > > of for_all_peers_=true annotation, but I
wanted to
> > preserve the
> > > symmetry
> > > with your original configuration.
> > >
> > >
> > > > And these all works like I need, But -
once I am
> > changing a
> > > list of
> > > > users (add or remove) - I need to use
"squid -k
> > > reconfigure"...... but
> > > > of course better to go without this
reconfigure
> > >
> > > One can avoid reconfiguration using an
external ACL
> > script that
> > > gives
> > > Squid the right for_peer_=... annotations
(instead
> of using
> > > "constant"
> > > or "hard-coded" annotate_transaction ACLs
to store
> the same
> > > annotations).
> > >
> > > However, it may be better to make the above
sketch
> to work
> > > _before_ you
> > > replace mark_for_peerG1 ACLs/rules with an
external
> > > mark_for_the_right_peer ACL.
> > >
> > >
> > > HTH,
> > >
> > > Alex.
> > > P.S. This thread continues the discussion
started at
> > > https://bugs.squid-cache.org/show_bug.cgi?id=5268
<https://bugs.squid-cache.org/show_bug.cgi?id=5268>
> <https://bugs.squid-cache.org/show_bug.cgi?id=5268
<https://bugs.squid-cache.org/show_bug.cgi?id=5268>>
> > <https://bugs.squid-cache.org/show_bug.cgi?id=5268
<https://bugs.squid-cache.org/show_bug.cgi?id=5268>
> <https://bugs.squid-cache.org/show_bug.cgi?id=5268
<https://bugs.squid-cache.org/show_bug.cgi?id=5268>>>
> > >
<https://bugs.squid-cache.org/show_bug.cgi?id=5268
<https://bugs.squid-cache.org/show_bug.cgi?id=5268>
> <https://bugs.squid-cache.org/show_bug.cgi?id=5268
<https://bugs.squid-cache.org/show_bug.cgi?id=5268>>
> > <https://bugs.squid-cache.org/show_bug.cgi?id=5268
<https://bugs.squid-cache.org/show_bug.cgi?id=5268>
> <https://bugs.squid-cache.org/show_bug.cgi?id=5268
<https://bugs.squid-cache.org/show_bug.cgi?id=5268>>>>
> > >
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> > >
> > >
> > >
> > > --
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> > > Алексей
> > > +79043828661
> > > 620000 г.Екатеринбург 2022
> > >
> > >
> > >
> > > --
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> > > Алексей
> > > +79043828661
> > > 620000 г.Екатеринбург 2022
> > >
> >
> >
> >
> > --
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> >
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