sssd/0005-ldap_child-do-not-try-PKINIT.patch

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From 580d61884b6c0a81357d8f9fa69fe69d1f017185 Mon Sep 17 00:00:00 2001
From: Sumit Bose <sbose@redhat.com>
Date: Fri, 6 Dec 2019 12:29:49 +0100
Subject: [PATCH] ldap_child: do not try PKINIT
if the PKINIT plugin is installed and pkinit_identities is set in
/etc/krb5.conf libkrb5 will try to do PKINIT although ldap_child only
wants to authenticate with a keytab. As a result ldap_child might try to
access a Smartcard which is either not allowed at all or might cause
unexpected delays.
To avoid this the current patch sets pkinit_identities for LDAP child
explicitly to make the PKINIT plugin fail because if installed libkrb5
will always use it.
It turned out the setting pre-authentication options requires some
internal flags to be set and krb5_get_init_creds_opt_alloc() must be
used to initialize the options struct.
Related to https://pagure.io/SSSD/sssd/issue/4126
Reviewed-by: Alexey Tikhonov <atikhono@redhat.com>
---
src/providers/ldap/ldap_child.c | 30 ++++++++++++++++++++++--------
1 file changed, 22 insertions(+), 8 deletions(-)
diff --git a/src/providers/ldap/ldap_child.c b/src/providers/ldap/ldap_child.c
index 408d64db4..b081df90f 100644
--- a/src/providers/ldap/ldap_child.c
+++ b/src/providers/ldap/ldap_child.c
@@ -277,7 +277,7 @@ static krb5_error_code ldap_child_get_tgt_sync(TALLOC_CTX *memctx,
krb5_ccache ccache = NULL;
krb5_principal kprinc;
krb5_creds my_creds;
- krb5_get_init_creds_opt options;
+ krb5_get_init_creds_opt *options = NULL;
krb5_error_code krberr;
krb5_timestamp kdc_time_offset;
int canonicalize = 0;
@@ -392,19 +392,32 @@ static krb5_error_code ldap_child_get_tgt_sync(TALLOC_CTX *memctx,
}
memset(&my_creds, 0, sizeof(my_creds));
- memset(&options, 0, sizeof(options));
- krb5_get_init_creds_opt_set_address_list(&options, NULL);
- krb5_get_init_creds_opt_set_forwardable(&options, 0);
- krb5_get_init_creds_opt_set_proxiable(&options, 0);
- krb5_get_init_creds_opt_set_tkt_life(&options, lifetime);
+ krberr = krb5_get_init_creds_opt_alloc(context, &options);
+ if (krberr != 0) {
+ DEBUG(SSSDBG_OP_FAILURE, "krb5_get_init_creds_opt_alloc failed.\n");
+ goto done;
+ }
+
+ krb5_get_init_creds_opt_set_address_list(options, NULL);
+ krb5_get_init_creds_opt_set_forwardable(options, 0);
+ krb5_get_init_creds_opt_set_proxiable(options, 0);
+ krb5_get_init_creds_opt_set_tkt_life(options, lifetime);
+ krberr = krb5_get_init_creds_opt_set_pa(context, options,
+ "X509_user_identity", "");
+ if (krberr != 0) {
+ DEBUG(SSSDBG_OP_FAILURE,
+ "krb5_get_init_creds_opt_set_pa failed [%d], ignored.\n",
+ krberr);
+ }
+
tmp_str = getenv("KRB5_CANONICALIZE");
if (tmp_str != NULL && strcasecmp(tmp_str, "true") == 0) {
DEBUG(SSSDBG_CONF_SETTINGS, "Will canonicalize principals\n");
canonicalize = 1;
}
- sss_krb5_get_init_creds_opt_set_canonicalize(&options, canonicalize);
+ sss_krb5_get_init_creds_opt_set_canonicalize(options, canonicalize);
ccname_file = talloc_asprintf(tmp_ctx, "%s/ccache_%s",
DB_PATH, realm_name);
@@ -433,7 +446,7 @@ static krb5_error_code ldap_child_get_tgt_sync(TALLOC_CTX *memctx,
}
krberr = krb5_get_init_creds_keytab(context, &my_creds, kprinc,
- keytab, 0, NULL, &options);
+ keytab, 0, NULL, options);
if (krberr != 0) {
DEBUG(SSSDBG_OP_FAILURE,
"krb5_get_init_creds_keytab() failed: %d\n", krberr);
@@ -513,6 +526,7 @@ static krb5_error_code ldap_child_get_tgt_sync(TALLOC_CTX *memctx,
*expire_time_out = my_creds.times.endtime - kdc_time_offset;
done:
+ krb5_get_init_creds_opt_free(context, options);
if (krberr != 0) {
if (*_krb5_msg == NULL) {
/* no custom error message provided hence get one from libkrb5 */
--
2.20.1