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From 5b9bc0a1a6116e6fb001c7dce7497854fcdd40c4 Mon Sep 17 00:00:00 2001
From: Sumit Bose <sbose@redhat.com>
Date: Thu, 14 Mar 2024 09:18:45 +0100
Subject: [PATCH 09/12] krb5: add OTP to krb5 response selection
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Originally where there was only password and OTP authentication we
checked for password authentication and used OTP as a fallback. This was
continued as other (pre)-authentication types were added. But so far
only one authentication type was returned.
This changed recently to allow the user a better selection and as a
result OTP cannot be handled as a fallback anymore but has to be added
to the selection. In case there are no types (questions) available now
password is used as a fallback.
Resolves: https://github.com/SSSD/sssd/issues/7152
Reviewed-by: Alejandro López <allopez@redhat.com>
Reviewed-by: Justin Stephenson <jstephen@redhat.com>
(cherry picked from commit bf6cb6dcdd94d9f47e4e74acd51e30f86b488943)
---
src/providers/krb5/krb5_child.c | 107 ++++++++++++++++++++++----------
1 file changed, 75 insertions(+), 32 deletions(-)
diff --git a/src/providers/krb5/krb5_child.c b/src/providers/krb5/krb5_child.c
index b8acae7d7..116f2adda 100644
--- a/src/providers/krb5/krb5_child.c
+++ b/src/providers/krb5/krb5_child.c
@@ -1200,6 +1200,44 @@ done:
#endif /* BUILD_PASSKEY */
}
+static krb5_error_code answer_password(krb5_context kctx,
+ struct krb5_req *kr,
+ krb5_responder_context rctx)
+{
+ krb5_error_code kerr;
+ int ret;
+ const char *pwd;
+
+ kr->password_prompting = true;
+
+ if ((kr->pd->cmd == SSS_PAM_AUTHENTICATE
+ || kr->pd->cmd == SSS_PAM_CHAUTHTOK_PRELIM
+ || kr->pd->cmd == SSS_PAM_CHAUTHTOK)
+ && sss_authtok_get_type(kr->pd->authtok)
+ == SSS_AUTHTOK_TYPE_PASSWORD) {
+ ret = sss_authtok_get_password(kr->pd->authtok, &pwd, NULL);
+ if (ret != EOK) {
+ DEBUG(SSSDBG_OP_FAILURE,
+ "sss_authtok_get_password failed.\n");
+ return ret;
+ }
+
+ kerr = krb5_responder_set_answer(kctx, rctx,
+ KRB5_RESPONDER_QUESTION_PASSWORD,
+ pwd);
+ if (kerr != 0) {
+ DEBUG(SSSDBG_OP_FAILURE,
+ "krb5_responder_set_answer failed.\n");
+ }
+
+ return kerr;
+ }
+
+ /* For SSS_PAM_PREAUTH and the other remaining commands the caller should
+ * continue to iterate over the available authentication methods. */
+ return EAGAIN;
+}
+
static krb5_error_code sss_krb5_responder(krb5_context ctx,
void *data,
krb5_responder_context rctx)
@@ -1207,9 +1245,7 @@ static krb5_error_code sss_krb5_responder(krb5_context ctx,
struct krb5_req *kr = talloc_get_type(data, struct krb5_req);
const char * const *question_list;
size_t c;
- const char *pwd;
- int ret;
- krb5_error_code kerr;
+ krb5_error_code kerr = EINVAL;
if (kr == NULL) {
return EINVAL;
@@ -1221,34 +1257,18 @@ static krb5_error_code sss_krb5_responder(krb5_context ctx,
for (c = 0; question_list[c] != NULL; c++) {
DEBUG(SSSDBG_TRACE_ALL, "Got question [%s].\n", question_list[c]);
+ /* It is expected that the answer_*() functions only return EOK
+ * (success) if the authentication was successful, i.e. during
+ * SSS_PAM_AUTHENTICATE. In all other cases, e.g. during
+ * SSS_PAM_PREAUTH either EAGAIN should be returned to indicate
+ * that the other available authentication methods should be
+ * checked as well. Or some other error code to indicate a fatal
+ * error where no other methods should be tried.
+ * Especially if setting the answer failed neither EOK nor EAGAIN
+ * should be returned. */
if (strcmp(question_list[c],
KRB5_RESPONDER_QUESTION_PASSWORD) == 0) {
- kr->password_prompting = true;
-
- if ((kr->pd->cmd == SSS_PAM_AUTHENTICATE
- || kr->pd->cmd == SSS_PAM_CHAUTHTOK_PRELIM
- || kr->pd->cmd == SSS_PAM_CHAUTHTOK)
- && sss_authtok_get_type(kr->pd->authtok)
- == SSS_AUTHTOK_TYPE_PASSWORD) {
- ret = sss_authtok_get_password(kr->pd->authtok, &pwd, NULL);
- if (ret != EOK) {
- DEBUG(SSSDBG_OP_FAILURE,
- "sss_authtok_get_password failed.\n");
- return ret;
- }
-
- kerr = krb5_responder_set_answer(ctx, rctx,
- KRB5_RESPONDER_QUESTION_PASSWORD,
- pwd);
- if (kerr != 0) {
- DEBUG(SSSDBG_OP_FAILURE,
- "krb5_responder_set_answer failed.\n");
- }
-
- return kerr;
- }
-
- kerr = EOK;
+ kerr = answer_password(ctx, kr, rctx);
} else if (strcmp(question_list[c],
KRB5_RESPONDER_QUESTION_PKINIT) == 0
&& (sss_authtok_get_type(kr->pd->authtok)
@@ -1265,6 +1285,8 @@ static krb5_error_code sss_krb5_responder(krb5_context ctx,
continue;
}
kerr = answer_passkey(ctx, kr, rctx);
+ } else if (strcmp(question_list[c], KRB5_RESPONDER_QUESTION_OTP) == 0) {
+ kerr = answer_otp(ctx, kr, rctx);
} else {
DEBUG(SSSDBG_MINOR_FAILURE, "Unknown question type [%s]\n", question_list[c]);
kerr = EINVAL;
@@ -1274,16 +1296,37 @@ static krb5_error_code sss_krb5_responder(krb5_context ctx,
* handled by the answer_* function. This allows fallback between auth
* types, such as passkey -> password. */
if (kerr == EAGAIN) {
- DEBUG(SSSDBG_TRACE_ALL, "Auth type [%s] could not be handled by answer function, "
- "continuing to next question.\n", question_list[c]);
+ /* During pre-auth iterating over all authentication methods
+ * is expected and no message will be displayed. */
+ if (kr->pd->cmd == SSS_PAM_AUTHENTICATE) {
+ DEBUG(SSSDBG_TRACE_ALL,
+ "Auth type [%s] could not be handled by answer "
+ "function, continuing to next question.\n",
+ question_list[c]);
+ }
continue;
} else {
return kerr;
}
}
+ } else {
+ kerr = answer_password(ctx, kr, rctx);
}
- return answer_otp(ctx, kr, rctx);
+ /* During SSS_PAM_PREAUTH 'EAGAIN' is expected because we will run
+ * through all offered authentication methods and all are expect to return
+ * 'EAGAIN' in the positive case to indicate that the other methods should
+ * be checked as well. If all methods are checked we are done and should
+ * return success.
+ * In the other steps, especially SSS_PAM_AUTHENTICATE, having 'EAGAIN' at
+ * this stage would mean that no method feels responsible for the provided
+ * credentials i.e. authentication failed and we should return an error.
+ */
+ if (kr->pd->cmd == SSS_PAM_PREAUTH) {
+ return kerr == EAGAIN ? 0 : kerr;
+ } else {
+ return kerr;
+ }
}
#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_RESPONDER */
--
2.42.0
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