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/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Copyright (C) 2021 Red Hat
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <krb5/clpreauth_plugin.h>
#include "krb5_plugin/common/radius_clpreauth.h"
#include "idp.h"
static krb5_pa_data **
sss_idpcl_encode_padata(void)
{
krb5_pa_data **padata;
padata = calloc(2, sizeof(krb5_pa_data *));
if (padata == NULL) {
return NULL;
}
padata[0] = malloc(sizeof(krb5_pa_data));
if (padata[0] == NULL) {
free(padata);
return NULL;
}
padata[0]->pa_type = SSSD_IDP_OAUTH2_PADATA;
padata[0]->contents = NULL;
padata[0]->length = 0;
padata[1] = NULL;
return padata;
}
static krb5_error_code
sss_idpcl_prompt(krb5_context context,
krb5_prompter_fct prompter,
void *prompter_data,
struct sss_idp_oauth2 *data,
krb5_data *_reply)
{
krb5_error_code ret;
krb5_prompt prompt;
char *prompt_str;
int aret;
if (data->verification_uri_complete != NULL) {
aret = asprintf(&prompt_str,
"Authenticate at %1$s and press ENTER.",
data->verification_uri_complete);
} else {
aret = asprintf(&prompt_str,
"Authenticate with PIN %1$s at %2$s and press ENTER.",
data->user_code, data->verification_uri);
}
if (aret < 0) {
return ENOMEM;
}
prompt.reply = _reply;
prompt.prompt = prompt_str;
prompt.hidden = 1;
ret = (*prompter)(context, prompter_data, NULL, NULL, 1, &prompt);
free(prompt_str);
return ret;
}
static krb5_error_code
sss_idpcl_prep_questions(krb5_context context,
krb5_clpreauth_moddata moddata,
krb5_clpreauth_modreq modreq,
krb5_get_init_creds_opt *opt,
krb5_clpreauth_callbacks cb,
krb5_clpreauth_rock rock,
krb5_kdc_req *request,
krb5_data *encoded_request_body,
krb5_data *encoded_previous_request,
krb5_pa_data *pa_data)
{
struct sss_idp_oauth2 *data;
char *challenge = NULL;
krb5_error_code ret;
data = sss_idp_oauth2_decode_padata(pa_data);
if (data == NULL) {
ret = ENOMEM;
goto done;
}
challenge = sss_idp_oauth2_encode_challenge(data);
if (challenge == NULL) {
ret = ENOMEM;
goto done;
}
ret = cb->ask_responder_question(context, rock, SSSD_IDP_OAUTH2_QUESTION,
challenge);
done:
sss_idp_oauth2_free(data);
free(challenge);
return ret;
}
static krb5_error_code
sss_idpcl_process(krb5_context context,
krb5_clpreauth_moddata moddata,
krb5_clpreauth_modreq modreq,
krb5_get_init_creds_opt *opt,
krb5_clpreauth_callbacks cb,
krb5_clpreauth_rock rock,
krb5_kdc_req *request,
krb5_data *encoded_request_body,
krb5_data *encoded_previous_request,
krb5_pa_data *pa_data,
krb5_prompter_fct prompter,
void *prompter_data,
krb5_pa_data ***_pa_data_out)
{
krb5_keyblock *as_key;
krb5_pa_data **padata;
krb5_error_code ret;
krb5_data reply;
struct sss_idp_oauth2 *data = NULL;
char prompt_answer[255] = {0};
const char *answer;
data = sss_idp_oauth2_decode_padata(pa_data);
if (data == NULL) {
ret = ENOMEM;
goto done;
}
/* Get FAST armor key. */
as_key = cb->fast_armor(context, rock);
if (as_key == NULL) {
ret = ENOENT;
goto done;
}
answer = cb->get_responder_answer(context, rock, SSSD_IDP_OAUTH2_QUESTION);
/* Call prompter if we have no answer. We don't really require any answer,
* but we need to present a prompt to the user and wait until the user has
* finished authentication via an idp provider. */
if (answer == NULL) {
reply.magic = 0;
reply.length = sizeof(prompt_answer) / sizeof(char);
reply.data = prompt_answer;
ret = sss_idpcl_prompt(context, prompter, prompter_data, data, &reply);
if (ret != 0) {
goto done;
}
}
/* Use FAST armor key as response key. */
ret = cb->set_as_key(context, rock, as_key);
if (ret != 0) {
goto done;
}
/* Encode the request into the pa_data output. */
padata = sss_idpcl_encode_padata();
if (padata == NULL) {
ret = ENOMEM;
goto done;
}
cb->disable_fallback(context, rock);
*_pa_data_out = padata;
ret = 0;
done:
sss_idp_oauth2_free(data);
return ret;
}
krb5_error_code
clpreauth_idp_initvt(krb5_context context,
int maj_ver,
int min_ver,
krb5_plugin_vtable vtable)
{
static krb5_preauthtype pa_type_list[] = { SSSD_IDP_OAUTH2_PADATA, 0 };
krb5_clpreauth_vtable vt;
if (maj_ver != 1) {
return KRB5_PLUGIN_VER_NOTSUPP;
}
vt = (krb5_clpreauth_vtable)vtable;
vt->name = discard_const(SSSD_IDP_PLUGIN);
vt->pa_type_list = pa_type_list;
vt->request_init = sss_radiuscl_init;
vt->prep_questions = sss_idpcl_prep_questions;
vt->process = sss_idpcl_process;
vt->request_fini = sss_radiuscl_fini;
vt->gic_opts = NULL;
return 0;
}
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