Conditionally disabling auth policy
I've been digging into the auth policy stuff with weakforced lately. There are cases (IP ranges, so could be wrapped up in remote {} blocks) where it'd be nice to skip the auth policy (internal hosts that I can trust, but that are hitting the same servers as the outside world).
Is there any way to disable auth policy, possibly inside a remote{}?
auth_policy_server_url complains that it can't be used inside a remote block, so no dice there. Anything I'm missing?
On 2017-09-27 16:57:44 +0000, Mark Moseley wrote:
I've been digging into the auth policy stuff with weakforced lately. There are cases (IP ranges, so could be wrapped up in remote {} blocks) where it'd be nice to skip the auth policy (internal hosts that I can trust, but that are hitting the same servers as the outside world).
Is there any way to disable auth policy, possibly inside a remote{}?
auth_policy_server_url complains that it can't be used inside a remote block, so no dice there. Anything I'm missing?
From my config:
allowed_subnets=newNetmaskGroup()
allowed_subnets:addMask('fe80::/64')
allowed_subnets:addMask('127.0.0.0/8')
[snip]
if (not(allowed_subnets.match(lt.remote)))
-- do GeoIP check
end
of course could just skip all checks in that case if really wanted. but you probably want to be careful not to skip too many checks otherwise the attack moves from your imap port e.g. to your webmailer.
darix
-- openSUSE - SUSE Linux is my linux openSUSE is good for you www.opensuse.org
On Wed, Sep 27, 2017 at 10:03 AM, Marcus Rueckert <darix@opensu.se> wrote:
On 2017-09-27 16:57:44 +0000, Mark Moseley wrote:
I've been digging into the auth policy stuff with weakforced lately. There are cases (IP ranges, so could be wrapped up in remote {} blocks) where it'd be nice to skip the auth policy (internal hosts that I can trust, but that are hitting the same servers as the outside world).
Is there any way to disable auth policy, possibly inside a remote{}?
auth_policy_server_url complains that it can't be used inside a remote block, so no dice there. Anything I'm missing?
From my config:
allowed_subnets=newNetmaskGroup() allowed_subnets:addMask('fe80::/64') allowed_subnets:addMask('127.0.0.0/8') [snip] if (not(allowed_subnets.match(lt.remote))) -- do GeoIP check endof course could just skip all checks in that case if really wanted. but you probably want to be careful not to skip too many checks otherwise the attack moves from your imap port e.g. to your webmailer.
Hi. Yup, I've got my own whitelisting going on, on the wforce side of things. I'm just looking to forgo the 3 HTTP reqs completely to wforce, from the dovecot side, if possible. I've got some internal services that can generate a significant amount of dovecot logins, but it's kind of silly to keep doing auth policy lookups for those internal servers.
To continue the Lua thread, I was thinking I could also drop a local openresty to do some conditional lookups. I.e. if remote IP is known good, a localhost nginx just sends back the response; if not a known good IP, then proxy the req over to the wforce cluster. That might be a bit overkill though :)
On 27.09.2017 20:14, Mark Moseley wrote:
On Wed, Sep 27, 2017 at 10:03 AM, Marcus Rueckert <darix@opensu.se> wrote:
On 2017-09-27 16:57:44 +0000, Mark Moseley wrote:
I've been digging into the auth policy stuff with weakforced lately. There are cases (IP ranges, so could be wrapped up in remote {} blocks) where it'd be nice to skip the auth policy (internal hosts that I can trust, but that are hitting the same servers as the outside world).
Is there any way to disable auth policy, possibly inside a remote{}?
auth_policy_server_url complains that it can't be used inside a remote block, so no dice there. Anything I'm missing? From my config:
allowed_subnets=newNetmaskGroup() allowed_subnets:addMask('fe80::/64') allowed_subnets:addMask('127.0.0.0/8') [snip] if (not(allowed_subnets.match(lt.remote))) -- do GeoIP check endof course could just skip all checks in that case if really wanted. but you probably want to be careful not to skip too many checks otherwise the attack moves from your imap port e.g. to your webmailer.
Hi. Yup, I've got my own whitelisting going on, on the wforce side of things. I'm just looking to forgo the 3 HTTP reqs completely to wforce, from the dovecot side, if possible. I've got some internal services that can generate a significant amount of dovecot logins, but it's kind of silly to keep doing auth policy lookups for those internal servers.
To continue the Lua thread, I was thinking I could also drop a local openresty to do some conditional lookups. I.e. if remote IP is known good, a localhost nginx just sends back the response; if not a known good IP, then proxy the req over to the wforce cluster. That might be a bit overkill though :) Hi!
Currently it's not possible to disable auth_policy conditionally, although it does sound like a good idea.
You should probably see also if your webmail supports passing the original IP to dovecot using
a01 ID ("X-Original-IP" "1.2.3.4")
before login, which would let you use weakforced in more meaningful way. There are few other fields too that can be used
Aki
On Wed, Sep 27, 2017 at 10:06 PM, Aki Tuomi <aki.tuomi@dovecot.fi> wrote:
On 27.09.2017 20:14, Mark Moseley wrote:
On Wed, Sep 27, 2017 at 10:03 AM, Marcus Rueckert <darix@opensu.se> wrote:
On 2017-09-27 16:57:44 +0000, Mark Moseley wrote:
I've been digging into the auth policy stuff with weakforced lately. There are cases (IP ranges, so could be wrapped up in remote {} blocks) where it'd be nice to skip the auth policy (internal hosts that I can trust, but that are hitting the same servers as the outside world).
Is there any way to disable auth policy, possibly inside a remote{}?
auth_policy_server_url complains that it can't be used inside a remote block, so no dice there. Anything I'm missing? From my config:
allowed_subnets=newNetmaskGroup() allowed_subnets:addMask('fe80::/64') allowed_subnets:addMask('127.0.0.0/8') [snip] if (not(allowed_subnets.match(lt.remote))) -- do GeoIP check endof course could just skip all checks in that case if really wanted. but you probably want to be careful not to skip too many checks otherwise the attack moves from your imap port e.g. to your webmailer.
Hi. Yup, I've got my own whitelisting going on, on the wforce side of things. I'm just looking to forgo the 3 HTTP reqs completely to wforce, from the dovecot side, if possible. I've got some internal services that can generate a significant amount of dovecot logins, but it's kind of silly to keep doing auth policy lookups for those internal servers.
To continue the Lua thread, I was thinking I could also drop a local openresty to do some conditional lookups. I.e. if remote IP is known good, a localhost nginx just sends back the response; if not a known good IP, then proxy the req over to the wforce cluster. That might be a bit overkill though :) Hi!
Currently it's not possible to disable auth_policy conditionally, although it does sound like a good idea.
You should probably see also if your webmail supports passing the original IP to dovecot using
a01 ID ("X-Original-IP" "1.2.3.4")
before login, which would let you use weakforced in more meaningful way. There are few other fields too that can be used
Aki
Yup, I've got that set up. I've got no problems with short-circuiting the request on the weakforce side quickly, in case of known good ips. Just hoping to avoid some unnecessary auth policy lookups.
Out of curiosity (and I've googled this before), what other fields can be used there?
On September 28, 2017 at 7:20 PM Mark Moseley <moseleymark@gmail.com> wrote:
On Wed, Sep 27, 2017 at 10:06 PM, Aki Tuomi <aki.tuomi@dovecot.fi> wrote:
On 27.09.2017 20:14, Mark Moseley wrote:
On Wed, Sep 27, 2017 at 10:03 AM, Marcus Rueckert <darix@opensu.se> wrote:
On 2017-09-27 16:57:44 +0000, Mark Moseley wrote:
I've been digging into the auth policy stuff with weakforced lately. There are cases (IP ranges, so could be wrapped up in remote {} blocks) where it'd be nice to skip the auth policy (internal hosts that I can trust, but that are hitting the same servers as the outside world).
Is there any way to disable auth policy, possibly inside a remote{}?
auth_policy_server_url complains that it can't be used inside a remote block, so no dice there. Anything I'm missing? From my config:
allowed_subnets=newNetmaskGroup() allowed_subnets:addMask('fe80::/64') allowed_subnets:addMask('127.0.0.0/8') [snip] if (not(allowed_subnets.match(lt.remote))) -- do GeoIP check endof course could just skip all checks in that case if really wanted. but you probably want to be careful not to skip too many checks otherwise the attack moves from your imap port e.g. to your webmailer.
Hi. Yup, I've got my own whitelisting going on, on the wforce side of things. I'm just looking to forgo the 3 HTTP reqs completely to wforce, from the dovecot side, if possible. I've got some internal services that can generate a significant amount of dovecot logins, but it's kind of silly to keep doing auth policy lookups for those internal servers.
To continue the Lua thread, I was thinking I could also drop a local openresty to do some conditional lookups. I.e. if remote IP is known good, a localhost nginx just sends back the response; if not a known good IP, then proxy the req over to the wforce cluster. That might be a bit overkill though :) Hi!
Currently it's not possible to disable auth_policy conditionally, although it does sound like a good idea.
You should probably see also if your webmail supports passing the original IP to dovecot using
a01 ID ("X-Original-IP" "1.2.3.4")
before login, which would let you use weakforced in more meaningful way. There are few other fields too that can be used
Aki
Yup, I've got that set up. I've got no problems with short-circuiting the request on the weakforce side quickly, in case of known good ips. Just hoping to avoid some unnecessary auth policy lookups.
Out of curiosity (and I've googled this before), what other fields can be used there?
- x-originating-ip - client IP
- x-originating-port - client port
- x-connected-ip - server IP (like, on proxy)
- x-connected-port - server port
- x-proxy-ttl - non-negative integer, decremented on each hop, used for loop detection.
- x-session-id - session ID, if you want to provide one
- x-session-ext-id - session prefix
- x-forward-<any_field_name> - field to import into passdb during authentication, comes prefixed with forward_. e.g if you set x-forward-username, it comes as forward_username, and can be used like
username=%{forward_username}
Aki
On Thu, Sep 28, 2017 at 9:34 AM, Aki Tuomi <aki.tuomi@dovecot.fi> wrote:
On September 28, 2017 at 7:20 PM Mark Moseley <moseleymark@gmail.com> wrote:
On Wed, Sep 27, 2017 at 10:06 PM, Aki Tuomi <aki.tuomi@dovecot.fi> wrote:
On 27.09.2017 20:14, Mark Moseley wrote:
On Wed, Sep 27, 2017 at 10:03 AM, Marcus Rueckert <darix@opensu.se> wrote:
On 2017-09-27 16:57:44 +0000, Mark Moseley wrote:
I've been digging into the auth policy stuff with weakforced
There
are cases (IP ranges, so could be wrapped up in remote {} blocks) where it'd be nice to skip the auth policy (internal hosts that I can
but
that are hitting the same servers as the outside world).
Is there any way to disable auth policy, possibly inside a remote{}?
auth_policy_server_url complains that it can't be used inside a remote block, so no dice there. Anything I'm missing? From my config:
allowed_subnets=newNetmaskGroup() allowed_subnets:addMask('fe80::/64') allowed_subnets:addMask('127.0.0.0/8') [snip] if (not(allowed_subnets.match(lt.remote))) -- do GeoIP check endof course could just skip all checks in that case if really wanted. but you probably want to be careful not to skip too many checks otherwise the attack moves from your imap port e.g. to your webmailer.
Hi. Yup, I've got my own whitelisting going on, on the wforce side of things. I'm just looking to forgo the 3 HTTP reqs completely to wforce, from the dovecot side, if possible. I've got some internal services
lately. trust, that
can generate a significant amount of dovecot logins, but it's kind of silly to keep doing auth policy lookups for those internal servers.
To continue the Lua thread, I was thinking I could also drop a local openresty to do some conditional lookups. I.e. if remote IP is known good, a localhost nginx just sends back the response; if not a known good IP, then proxy the req over to the wforce cluster. That might be a bit overkill though :) Hi!
Currently it's not possible to disable auth_policy conditionally, although it does sound like a good idea.
You should probably see also if your webmail supports passing the original IP to dovecot using
a01 ID ("X-Original-IP" "1.2.3.4")
before login, which would let you use weakforced in more meaningful way. There are few other fields too that can be used
Aki
Yup, I've got that set up. I've got no problems with short-circuiting the request on the weakforce side quickly, in case of known good ips. Just hoping to avoid some unnecessary auth policy lookups.
Out of curiosity (and I've googled this before), what other fields can be used there?
- x-originating-ip - client IP
- x-originating-port - client port
- x-connected-ip - server IP (like, on proxy)
- x-connected-port - server port
- x-proxy-ttl - non-negative integer, decremented on each hop, used for loop detection.
- x-session-id - session ID, if you want to provide one
- x-session-ext-id - session prefix
- x-forward-<any_field_name> - field to import into passdb during authentication, comes prefixed with forward_. e.g if you set x-forward-username, it comes as forward_username, and can be used like
username=%{forward_username}
The 'forward' stuff is gold. I found that I had to access it like this: %{passwd:forward_<name>}
Is that the right way to use it?
Also (unrelated), I noticed this in the wiki but it's not in the release notes for 2.2.32 (and it sounds super useful):
"Since v2.2.32 it's possible to use conditionals in variable expansion"
On 28.09.2017 22:32, Mark Moseley wrote:
On Thu, Sep 28, 2017 at 9:34 AM, Aki Tuomi <aki.tuomi@dovecot.fi <mailto:aki.tuomi@dovecot.fi>> wrote:
> On September 28, 2017 at 7:20 PM Mark Moseley <moseleymark@gmail.com <mailto:moseleymark@gmail.com>> wrote: > > > On Wed, Sep 27, 2017 at 10:06 PM, Aki Tuomi <aki.tuomi@dovecot.fi <mailto:aki.tuomi@dovecot.fi>> wrote: > > > > > > > On 27.09.2017 20 <tel:27.09.2017%2020>:14, Mark Moseley wrote: > > > On Wed, Sep 27, 2017 at 10:03 AM, Marcus Rueckert <darix@opensu.se <mailto:darix@opensu.se>> > > wrote: > > > > > >> On 2017-09-27 16:57:44 +0000, Mark Moseley wrote: > > >>> I've been digging into the auth policy stuff with weakforced lately. > > >> There > > >>> are cases (IP ranges, so could be wrapped up in remote {} blocks) where > > >>> it'd be nice to skip the auth policy (internal hosts that I can trust, > > >> but > > >>> that are hitting the same servers as the outside world). > > >>> > > >>> Is there any way to disable auth policy, possibly inside a remote{}? > > >>> > > >>> auth_policy_server_url complains that it can't be used inside a remote > > >>> block, so no dice there. Anything I'm missing? > > >> From my config: > > >> ``` > > >> allowed_subnets=newNetmaskGroup() > > >> allowed_subnets:addMask('fe80::/64') > > >> allowed_subnets:addMask('127.0.0.0/8 <http://127.0.0.0/8>') > > >> [snip] > > >> if (not(allowed_subnets.match(lt.remote))) > > >> -- do GeoIP check > > >> end > > >> ``` > > >> > > >> of course could just skip all checks in that case if really wanted. but > > >> you probably want to be careful not to skip too many checks otherwise > > >> the attack moves from your imap port e.g. to your webmailer. > > >> > > >> > > >> > > > Hi. Yup, I've got my own whitelisting going on, on the wforce side of > > > things. I'm just looking to forgo the 3 HTTP reqs completely to wforce, > > > from the dovecot side, if possible. I've got some internal services that > > > can generate a significant amount of dovecot logins, but it's kind of > > silly > > > to keep doing auth policy lookups for those internal servers. > > > > > > To continue the Lua thread, I was thinking I could also drop a local > > > openresty to do some conditional lookups. I.e. if remote IP is known > > good, > > > a localhost nginx just sends back the response; if not a known good IP, > > > then proxy the req over to the wforce cluster. That might be a bit > > overkill > > > though :) > > Hi! > > > > Currently it's not possible to disable auth_policy conditionally, > > although it does sound like a good idea. > > > > You should probably see also if your webmail supports passing the > > original IP to dovecot using > > > > a01 ID ("X-Original-IP" "1.2.3.4") > > > > before login, which would let you use weakforced in more meaningful way. > > There are few other fields too that can be used > > > > Aki > > > > Yup, I've got that set up. I've got no problems with short-circuiting the > request on the weakforce side quickly, in case of known good ips. Just > hoping to avoid some unnecessary auth policy lookups. > > Out of curiosity (and I've googled this before), what other fields can be > used there? * x-originating-ip - client IP * x-originating-port - client port * x-connected-ip - server IP (like, on proxy) * x-connected-port - server port * x-proxy-ttl - non-negative integer, decremented on each hop, used for loop detection. * x-session-id - session ID, if you want to provide one * x-session-ext-id - session prefix * x-forward-<any_field_name> - field to import into passdb during authentication, comes prefixed with forward_. e.g if you set x-forward-username, it comes as forward_username, and can be used like username=%{forward_username}The 'forward' stuff is gold. I found that I had to access it like this: %{passwd:forward_<name>}
Is that the right way to use it?
Also (unrelated), I noticed this in the wiki but it's not in the release notes for 2.2.32 (and it sounds super useful):
"Since v2.2.32 it's possible to use conditionals in variable expansion"
Depends where you use it. In passdb expansion, you can use %{forward_name}. You should use userdb_something=%{forward_something} to move it properly into userdb, you can drop the forward, too. We use this to forward stuff from proxy=>backend.
Conditionals were probably forgotten from release notes.
Aki
participants (3)
-
Aki Tuomi
-
Marcus Rueckert
-
Mark Moseley