Hi,

int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
X509_STORE *st, unsigned long flags);

https://github.com/SSSD/sssd/blob/ca684cd156debbdf3d95776271e7020b883b1e81/src/p11_child/p11_child_openssl.c#L458 :

```

status = OCSP_basic_verify(ocsp_basic, NULL, p11_ctx->x509_store, 0);

```

-- 'p11_child' doesn't supply neither 'certs' nor 'flags' (like OCSP_TRUSTOTHER etc)

So IIUC the only case when a response signature is considered valid is when the signer's certificate can be validated using the store.

On Fri, May 10, 2024 at 2:43 PM Rob Crittenden <rcritten@redhat.com> wrote:

Cross posting this to sssd-users.

rob

Alvarez, Angelo CIV USN JOINT TYPHOON WARCEN (USA) via FreeIPA-users wrote:
> Aloha. We are trying to get OCSP verification working with RHEL 8 SSSD.
> The OCSP responder CA is not in the trust chain of the CA that issued
> the smart card certificates. I was able to get openssl ocsp
> verification to work using “-verify_other” and “-trust_other” options.
>
> [root@c27nmgmtjtprlh1 PKI]# openssl ocsp -issuer DOD_ID_CA-63.pem
> -verify_other NAWEPRLHRD12.pem -trust_other -cert ~alvareza/alvarez.pem
> -url http://repeater1.xxxxx.xxxxx.xxxx.xxxx.xxxx -respout -text
> WARNING: no nonce in response
> Response verify OK
> /home/alvareza/alvarez.pem: good
> This Update: May 9 00:00:00 2024 GMT
> Next Update: May 15 06:16:18 2024 GMT
>
>
>
> I tried to perform OCSP verification with the SSSD p11_child helper, but
> it does not work. Does anyone know if the “Direct Trust” model for OCSP
> works with RHEL 8 SSSD?
> [root@c27nmgmtjtprlh1 pki]# /usr/libexec/sssd/p11_child --dumpable=1
> --debug-microseconds=0 --debug-timestamps=1 --debug-fd=22
> --debug-level=9 --verification --verify
> ocsp_dgst=sha1,ocsp_default_responder=http://repeater1.xxxxx.xxxxx.xxxx.xxxx.xxxx
> --ca_db=/etc/sssd/pki/sssd_auth_ca_db.pem --certificate=$(cat
> /home/alvareza/alvarez.pem | grep -v BEGIN | grep -v END | tr -d "\n")
> set_debug_file_from_fd failed.
> (2024-05-09 8:07:24): [p11_child[2817468]] [main] (0x0400): p11_child
> started.
> (2024-05-09 8:07:24): [p11_child[2817468]] [main] (0x2000): Running in
> [verify] mode.
> (2024-05-09 8:07:24): [p11_child[2817468]] [main] (0x2000): Running
> with effective IDs: [0][0].
> (2024-05-09 8:07:24): [p11_child[2817468]] [main] (0x2000): Running
> with real IDs [0][0].
> (2024-05-09 8:07:24): [p11_child[2817468]] [parse_cert_verify_opts]
> (0x4000): Using sha1 for OCSP.
> (2024-05-09 8:07:24): [p11_child[2817468]] [parse_cert_verify_opts]
> (0x4000): Using OCSP default responder
> [http://repeater1.prlh.nadsuswe.nads.navy.mil]
> (2024-05-09 8:07:24): [p11_child[2817468]] [do_ocsp] (0x4000): Using
> OCSP URL [http://repeater1.prlh.nadsuswe.nads.navy.mil].
> (2024-05-09 8:07:24): [p11_child[2817468]] [do_ocsp] (0x0020): No nonce
> in OCSP response. This might indicate a replay attack or an OCSP
> responder which does not support nonces. Accepting response.
> (2024-05-09 8:07:24): [p11_child[2817468]] [do_ocsp] (0x0020):
> OCSP_basic_verify() failed to verify OCSP response.
> (2024-05-09 8:07:24): [p11_child[2817468]] [do_verification] (0x0040):
> do_ocsp failed.
> (2024-05-09 8:07:24): [p11_child[2817468]] [do_work] (0x0400):
> Certificate is NOT valid.
> 22
> (2024-05-09 8:07:24): [p11_child[2817468]] [main] (0x0020): p11_child
> failed (22)
>
>
>
> v/r
>
>
>
> Angelo Alvarez, CISSP
>
> N6
>
> Joint Typhoon Warning Center
>
> Work: 808.471.3645
>
> Mobile: 808.389.9474
>
> Email: angelo.alvarez@navy.mil <mailto:angelo.alvarez@navy.mil>
>
> SiPR Email: angelo.alvarez@navy.smil.mil
> <mailto:angelo.alvarez@navy.smil.mil>
>
>
>
> “!No contaban on mi astucia!” – El Chapulin Colorado
>
>
>
>
>
>
> --
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