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From: Ajit Awekar <ajitpostgres@gmail.com>
Date: Tue, 31 Mar 2026 19:19:45 +0530
Message-ID: 
 <CAER375MGy1epyu=Lmw-bW9kKPtU5t4fJ2j0kjmZA7wnf1TmRug@mail.gmail.com>
Subject: Re: [OAuth2] Infrastructure for tracking token expiry time
To: Zsolt Parragi <zsolt.parragi@percona.com>
Cc: Daniel Gustafsson <daniel@yesql.se>, VASUKI M <vasukianand0119@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
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Hi All,

 I've added additional test cases to src/test/authentication/t/
008_continuous_validation.pl to improve coverage of the continuous
credential
  validation feature.

Updated the README with:
  - Fixed interval parameter
  - Added a Testing section documenting all 6 test cases

  - Added instructions for running the tests


Thanks & Best Regards,
Ajit

On Fri, 27 Mar 2026 at 16:29, Ajit Awekar <ajitpostgres@gmail.com> wrote:

> Hi All,
>
> I'd like to propose a patch that adds a credential validation framework to
> PostgreSQL, enabling periodic re-validation of authentication
>  credentials during active sessions.
>
> Currently, PostgreSQL validates credentials only at connection time. Once
> authenticated, a session remains valid even if the underlying
> credentials expire (e.g., a user's rolvaliduntil passes, or an OAuth token
> expires). This can be problematic in environments with strict
> security requirements where sessions should be terminated when credentials
> become invalid.
>
> This patch introduces a timer-based credential validation mechanism that
> periodically checks whether a session's authentication credentials are
>  still valid. When credentials are found to be expired, the session is
> terminated with an appropriate error message
>
> *Key Components  *
>
>   1. Core Framework (auth-validate.c, auth-validate.h)
>     - Manages validation callbacks for different authentication methods
>     - Provides a timeout-based scheduler using
> CREDENTIAL_VALIDATION_TIMEOUT
>
>     - Handles validation status (CVS_VALID, CVS_EXPIRED, CVS_ERROR)
>   2. Validation Methods (auth-validate-methods.c)
>
>     - Password validation: checks rolvaliduntil in pg_authid
>
>     - OAuth validation: delegates to the validator module's new expire_cb
> callback
>   3. GUC Parameters
>
>     - credential_validation.enabled (boolean, default: false)
>     - credential_validation.interval (integer, 1-60 minutes, default: 1)
>
> *OAuth Validator Changes  *
>
>
>   The patch extends the OAuth validator API with an optional expire_cb
> callback. To maintain backward compatibility, the magic version has been
>   bumped to PG_OAUTH_VALIDATOR_MAGIC_V2. Existing V1 validators continue
> to work; the server simply skips expiration checking for them.
>
>
> *Example Configuration*
>   credential_validation.enabled = on
>   credential_validation.interval = 5   # minutes
>
> Thanks & Best Regards,
> Ajit
>
>
> On Mon, 16 Mar 2026 at 19:27, Ajit Awekar <ajitpostgres@gmail.com> wrote:
>
>> Hi,
>>
>> Please find the attached first version of the patch providing credential
>> validation framework.
>>
>> The credential validation framework provides a mechanism to continuously
>> validate authentication credentials during an active session. This enables
>> the server to periodically check credential validity and take appropriate
>> action when credentials expire or become invalid.
>>
>>   Currently, Postgres validates credentials only at connection time. Once
>> authenticated, a session remains active even if:
>>
>>   - A user's rolvaliduntil expiration time passes
>>   - An OAuth bearer token expires
>>
>>
>>
>> * Proposed Solution*
>>   The patch introduces a credential validation framework that:
>>
>>   1. Periodically checks credential validity during active sessions
>>   2. Terminates sessions when credentials expire or become invalid
>>
>> *Implementation*
>>
>>   The framework consists of:
>>
>>   - Core infrastructure (auth-validate.c/h): Manages validation
>> callbacks, dispatches validation checks based on authentication method
>>   - Method implementations (auth-validate-methods.c/h): Contains
>> validators for password-based auth (checks rolvaliduntil in pg_authid) and
>> OAuth
>>   (delegates to validator's expire_cb)
>>
>>   Validation is triggered during query execution in both simple and
>> extended query protocol paths, using a time-based approach to limit
>> overhead.
>>
>>
>> *  Configuration*
>>   Two new GUC parameters:
>>
>>   credential_validation.enabled = false   # enable/disable validation
>>   credential_validation.interval = 1      # check interval in minutes
>> (1-60)
>>
>>
>> * Extensibility*
>>   New authentication methods can be supported by:
>>   1. Adding an enum value to CredentialValidationType
>>   2. Implementing a validation callback
>>   3. Registering it via RegisterCredentialValidator()
>>
>>
>>  Should there be per-authentication-method enable/disable settings?
>>
>> Thanks & Best Regards,
>> Ajit
>>
>>
>> On Fri, 20 Feb 2026 at 15:12, Ajit Awekar <ajitpostgres@gmail.com> wrote:
>>
>>>
>>> Thanks a lot Daniel, Zslot, Vasuki for your review comments.
>>>
>>> >The mechanism used is however a secondary discussion,
>>> >first thing to get in place is a design for how to handle mid-connection
>>> >credential expiration.
>>>
>>> This patch introduces a generic credential validation framework that
>>> allows
>>>  us to periodically validate authentication credentials during active
>>>  database sessions. When enabled, this feature detects expired
>>>  credentials and terminates sessions that are no longer valid.
>>>
>>>  Added GUCs
>>> Credential_validation.enabled = on   // Enable or Disable Credential
>>> validation
>>> Credential_validation.interval = 120  //Frequency in seconds of running
>>> credential validation
>>>
>>>  The callback mechanism works by:
>>>   - Defining a CredentialValidationCallback function pointer type
>>>   - Maintaining an array of validators indexed by authentication method
>>>   - Allowing other auth mechanisms to register validators via
>>>     RegisterCredentialValidator()
>>>   - Selecting the appropriate validator at runtime based on the session's
>>>     authentication method
>>>
>>> The current implementation primarily supports password-based
>>> authentication methods, verifying that passwords haven't expired. It can be
>>> extended to any authentication method.
>>> This patch is WIP. I am submitting it now to get early feedback on the
>>> overall design and approach.
>>>
>>> Thanks & Best Regards,
>>> Ajit
>>>
>>> On Wed, 18 Feb 2026 at 22:29, Zsolt Parragi <zsolt.parragi@percona.com>
>>> wrote:
>>>
>>>> > but I still think that neither should overload
>>>> > what FATAL error means
>>>>
>>>> I see, I misunderstood what you meant by graceful there. In this case,
>>>> this is also a good comment for the password expiration thread,
>>>> currently that also uses FATAL errors for terminating a connection
>>>> when the password expires.
>>>>
>>>> What other option do you see? Something new for this use case like
>>>> GoAway, and clients not understanding it simply get disconnected after
>>>> some grace period? Or using the recently merged connectionWarning to
>>>> send a warning to the client, and disconnect it shortly if it doesn't
>>>> do anything to fix the situation?
>>>>
>>>> When I tested the password expiration patch I noticed that deleted
>>>> users who still have remaining active connections currently get ERRORs
>>>> for every statement that requires permission checks, so in this regard
>>>> using ERROR/FATAL for the situation seemed fine to me - it's similar
>>>> to what already happens in some edge cases with authentication.
>>>>
>>>

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<div dir=3D"ltr">Hi All,<div><br></div><div>=C2=A0I&#39;ve added additional=
 test cases to src/test/authentication/t/<a href=3D"http://008_continuous_v=
alidation.pl">008_continuous_validation.pl</a> to improve coverage of the c=
ontinuous credential =C2=A0 =C2=A0 <br>=C2=A0 validation feature.</div><div=
><br></div><div>Updated the README with:<br>=C2=A0 - Fixed interval paramet=
er<br>=C2=A0 - Added a Testing section documenting all 6 test cases =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0<br>=C2=A0 - Added instructions for running the tests<br></div=
><div><br></div><div><br></div><div>Thanks &amp; Best Regards,</div><div>Aj=
it</div></div><br><div class=3D"gmail_quote gmail_quote_container"><div dir=
=3D"ltr" class=3D"gmail_attr">On Fri, 27 Mar 2026 at 16:29, Ajit Awekar &lt=
;<a href=3D"mailto:ajitpostgres@gmail.com">ajitpostgres@gmail.com</a>&gt; w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=
=3D"ltr"><div>Hi All,</div><div><br></div>I&#39;d like to propose a patch t=
hat adds a credential validation framework to PostgreSQL, enabling periodic=
 re-validation of authentication<div>=C2=A0credentials during active sessio=
ns.<div><br></div><div>Currently, PostgreSQL validates credentials only at =
connection time. Once authenticated, a session remains valid even if the un=
derlying =C2=A0 =C2=A0 =C2=A0 =C2=A0 <br>credentials expire (e.g., a user&#=
39;s rolvaliduntil passes, or an OAuth token expires). This can be problema=
tic in environments with strict<br>security requirements where sessions sho=
uld be terminated when credentials become invalid.</div><div><br></div><div=
>This patch introduces a timer-based credential validation mechanism that p=
eriodically checks whether a session&#39;s authentication credentials are</=
div><div>=C2=A0still valid. When credentials are found to be expired, the s=
ession is terminated with an appropriate error message</div><div><br></div>=
<div><b>Key Components =C2=A0</b><br><br>=C2=A0 1. Core Framework (auth-val=
idate.c, auth-validate.h)<br>=C2=A0 =C2=A0 - Manages validation callbacks f=
or different authentication methods<br>=C2=A0 =C2=A0 - Provides a timeout-b=
ased scheduler using CREDENTIAL_VALIDATION_TIMEOUT =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<b=
r>=C2=A0 =C2=A0 - Handles validation status (CVS_VALID, CVS_EXPIRED, CVS_ER=
ROR)<br>=C2=A0 2. Validation Methods (auth-validate-methods.c) =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <br>=C2=A0 =C2=A0 - Password validation: ch=
ecks rolvaliduntil in pg_authid =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<br>=C2=A0 =C2=A0 - OAuth validation:=
 delegates to the validator module&#39;s new expire_cb callback<br>=C2=A0 3=
. GUC Parameters =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 <br>=C2=A0 =C2=A0 - credential_validation.enabled (boolea=
n, default: false)<br>=C2=A0 =C2=A0 - credential_validation.interval (integ=
er, 1-60 minutes, default: 1)=C2=A0=C2=A0</div><div><br></div><div><b>OAuth=
 Validator Changes =C2=A0</b> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <=
br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <br>=C2=
=A0 The patch extends the OAuth validator API with an optional expire_cb ca=
llback. To maintain backward compatibility, the magic version has been<br>=
=C2=A0 bumped to PG_OAUTH_VALIDATOR_MAGIC_V2. Existing V1 validators contin=
ue to work; the server simply skips expiration checking for them.<br></div>=
<div><br></div><div><b>Example Configuration<br></b><br>=C2=A0 credential_v=
alidation.enabled =3D on<br>=C2=A0 credential_validation.interval =3D 5 =C2=
=A0 # minutes=C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0</div><div><br></div><div>Tha=
nks &amp; Best Regards,</div><div>Ajit</div><div><br></div></div></div><br>=
<div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, 16=
 Mar 2026 at 19:27, Ajit Awekar &lt;<a href=3D"mailto:ajitpostgres@gmail.co=
m" target=3D"_blank">ajitpostgres@gmail.com</a>&gt; wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Hi,<div><br></d=
iv><div>Please find the attached first version of the patch providing crede=
ntial validation framework.=C2=A0</div><div><br></div><div>The credential v=
alidation framework provides a mechanism to continuously validate authentic=
ation credentials during an active=C2=A0session. This enables the server to=
 periodically check credential validity and take appropriate action when cr=
edentials expire or become invalid.</div><div><br></div><div>=C2=A0 Current=
ly, Postgres validates credentials only at connection time. Once authentica=
ted, a session remains active even if:<br><br>=C2=A0 - A user&#39;s rolvali=
duntil expiration time passes<br>=C2=A0 - An OAuth bearer token expires<br>=
<br></div><div><br></div><div><b>=C2=A0Proposed Solution<br></b><br>=C2=A0 =
The patch introduces a credential validation framework that:<br><br>=C2=A0 =
1. Periodically checks credential validity during active sessions<br>=C2=A0=
 2. Terminates sessions when credentials expire or become invalid<br><br><b=
>Implementation</b><br><br>=C2=A0 The framework consists of:<br><br>=C2=A0 =
- Core infrastructure (auth-validate.c/h): Manages validation callbacks, di=
spatches validation checks based on authentication method<br>=C2=A0 - Metho=
d implementations (auth-validate-methods.c/h): Contains validators for pass=
word-based auth (checks rolvaliduntil in pg_authid) and OAuth<br>=C2=A0 (de=
legates to validator&#39;s expire_cb)<br><br>=C2=A0 Validation is triggered=
 during query execution in both simple and extended query protocol paths, u=
sing a time-based approach to limit overhead.<br><br><b>=C2=A0 Configuratio=
n<br></b><br>=C2=A0 Two new GUC parameters:<br><br>=C2=A0 credential_valida=
tion.enabled =3D false =C2=A0 # enable/disable validation<br>=C2=A0 credent=
ial_validation.interval =3D 1 =C2=A0 =C2=A0 =C2=A0# check interval in minut=
es (1-60)<br></div><div><br></div><div><b>=C2=A0Extensibility<br></b><br>=
=C2=A0 New authentication methods can be supported by:<br>=C2=A0 1. Adding =
an enum value to CredentialValidationType<br>=C2=A0 2. Implementing a valid=
ation callback<br>=C2=A0 3. Registering it via RegisterCredentialValidator(=
)</div><div><br></div><div><br></div><div>=C2=A0Should there be per-authent=
ication-method enable/disable settings?</div><div><br></div><div>Thanks &am=
p; Best Regards,</div><div>Ajit</div><div><br></div><div></div></div><br><d=
iv class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, 20 F=
eb 2026 at 15:12, Ajit Awekar &lt;<a href=3D"mailto:ajitpostgres@gmail.com"=
 target=3D"_blank">ajitpostgres@gmail.com</a>&gt; wrote:<br></div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px =
solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><br><div>Thanks a=
 lot Daniel, Zslot, Vasuki for your review=C2=A0comments.</div><div><br></d=
iv><div>&gt;The mechanism used is however a secondary discussion,<br>&gt;fi=
rst thing to get in place is a design for how to handle mid-connection<br><=
div>&gt;credential expiration.</div><div><br>This patch introduces a generi=
c credential validation framework that allows =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <br>=C2=A0us=
 to periodically validate authentication credentials during active<br>=C2=
=A0database sessions. When enabled, this feature detects expired=C2=A0<br>=
=C2=A0credentials and terminates sessions that are no longer valid.<br>=C2=
=A0 <br>=C2=A0Added GUCs<br>Credential_validation.enabled =3D on =C2=A0 // =
Enable or Disable Credential validation<br>Credential_validation.interval =
=3D 120 =C2=A0//Frequency in seconds of running credential validation<br><b=
r>=C2=A0The callback mechanism works by:<br>=C2=A0 - Defining a CredentialV=
alidationCallback function pointer type<br>=C2=A0 - Maintaining an array of=
 validators indexed by authentication method<br>=C2=A0 - Allowing other aut=
h mechanisms to register validators via<br>=C2=A0 =C2=A0 RegisterCredential=
Validator()<br>=C2=A0 - Selecting the appropriate validator at runtime base=
d on the session&#39;s<br>=C2=A0 =C2=A0 authentication method<br><br>The cu=
rrent implementation primarily supports password-based authentication metho=
ds, verifying that passwords haven&#39;t expired. It can be extended to any=
 authentication method.<br>This patch is WIP. I am submitting it now to get=
 early feedback on the overall design and approach.<br>=C2=A0=C2=A0</div><d=
iv>Thanks &amp; Best Regards,</div><div>Ajit</div></div><div></div></div><b=
r><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, =
18 Feb 2026 at 22:29, Zsolt Parragi &lt;<a href=3D"mailto:zsolt.parragi@per=
cona.com" target=3D"_blank">zsolt.parragi@percona.com</a>&gt; wrote:<br></d=
iv><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bord=
er-left:1px solid rgb(204,204,204);padding-left:1ex">&gt; but I still think=
 that neither should overload<br>
&gt; what FATAL error means<br>
<br>
I see, I misunderstood what you meant by graceful there. In this case,<br>
this is also a good comment for the password expiration thread,<br>
currently that also uses FATAL errors for terminating a connection<br>
when the password expires.<br>
<br>
What other option do you see? Something new for this use case like<br>
GoAway, and clients not understanding it simply get disconnected after<br>
some grace period? Or using the recently merged connectionWarning to<br>
send a warning to the client, and disconnect it shortly if it doesn&#39;t<b=
r>
do anything to fix the situation?<br>
<br>
When I tested the password expiration patch I noticed that deleted<br>
users who still have remaining active connections currently get ERRORs<br>
for every statement that requires permission checks, so in this regard<br>
using ERROR/FATAL for the situation seemed fine to me - it&#39;s similar<br=
>
to what already happens in some edge cases with authentication.<br>
</blockquote></div>
</blockquote></div>
</blockquote></div>
</blockquote></div>

--000000000000249894064e523ecd--

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