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This bug is created as a clone of upstream ticket:
https://pagure.io/SSSD/sssd/issue/3438
See
if (resp[1].resp == NULL || *(resp[1].resp) == '\0'
|| (pi->pam_service != NULL && strcmp(pi->pam_service, "sshd") == 0
&& strcmp(resp[0].resp, resp[1].resp) == 0)) {
/* Missing second factor, assume first factor contains combined 2FA
* credentials.
* Special handling for SSH with password authentication. Combined
* 2FA credentials are used but SSH puts them in both responses. */
in
https://github.com/SSSD/sssd/blob/818d01b4a0d332fff06db33c0c985b8c0f1417c7/src/sss_client/pam_sss.c
This code allows only SSHD to combine two factors together but other services might be doing that too.
User story:
From my application that uses PAM for authentication (WebApp/Radius/Tacacs) I would like to use SSSD for 2FA authentication against IdM. I would like to combine both factors in one prompt for the service I use so that I do not have to implement double prompting in my application.
Proposed approach:
1. SSSD config
single_prompt = sshd, my_app, another_app
2. Pseudo code
if (resp[1].resp == NULL || *(resp[1].resp) == '\0'
|| (pi->pam_service != NULL && in_single_prompt_list(pi->pam_service, single_prompt_list) == 0
&& strcmp(resp[0].resp, resp[1].resp) == 0)) {
...