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From 00f8ddbfd2795228b343e1c39c1944b44d482c18 Mon Sep 17 00:00:00 2001
From: Alexander Bokovoy <abokovoy@redhat.com>
Date: Fri, 24 Nov 2023 11:46:19 +0200
Subject: [PATCH 1/4] ipa-kdb: add better detection of allowed user auth type
If default user authentication type is set to a list that does not
include a password or a hardened credential, the resulting configuration
might be incorrect for special service principals, including a krbtgt/..
one.
Add detection of special principals to avoid these situations and always
allow password or hardened for services.
Special handling is needed for the following principals:
- krbtgt/.. -- TGT service principals
- K/M -- master key principal
- kadmin/changepw -- service for changing passwords
- kadmin/kadmin -- kadmin service principal
- kadmin/history -- key used to encrypt history
Additionally, implicitly allow password or hardened credential use for
IPA services and IPA hosts since applications typically use keytabs for
that purpose.
Fixes: https://pagure.io/freeipa/issue/9485
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Francisco Trivino <ftrivino@redhat.com>
---
daemons/ipa-kdb/ipa_kdb.c | 62 ++++++++++++++++++++++++++++++++++-----
1 file changed, 54 insertions(+), 8 deletions(-)
diff --git a/daemons/ipa-kdb/ipa_kdb.c b/daemons/ipa-kdb/ipa_kdb.c
index 06d511c76..dbb98dba6 100644
--- a/daemons/ipa-kdb/ipa_kdb.c
+++ b/daemons/ipa-kdb/ipa_kdb.c
@@ -26,6 +26,7 @@
#include "ipa_kdb.h"
#include "ipa_krb5.h"
#include "ipa_hostname.h"
+#include <kadm5/admin.h>
#define IPADB_GLOBAL_CONFIG_CACHE_TIME 60
@@ -207,6 +208,19 @@ static const struct {
{ "idp", IPADB_USER_AUTH_IDP },
{ "passkey", IPADB_USER_AUTH_PASSKEY },
{ }
+},
+ objclass_table[] = {
+ { "ipaservice", IPADB_USER_AUTH_PASSWORD },
+ { "ipahost", IPADB_USER_AUTH_PASSWORD },
+ { }
+},
+ princname_table[] = {
+ { KRB5_TGS_NAME, IPADB_USER_AUTH_PASSWORD },
+ { KRB5_KDB_M_NAME, IPADB_USER_AUTH_PASSWORD },
+ { KADM5_ADMIN_SERVICE, IPADB_USER_AUTH_PASSWORD },
+ { KADM5_CHANGEPW_SERVICE, IPADB_USER_AUTH_PASSWORD },
+ { KADM5_HIST_PRINCIPAL, IPADB_USER_AUTH_PASSWORD },
+ { }
};
void ipadb_parse_user_auth(LDAP *lcontext, LDAPMessage *le,
@@ -217,17 +231,49 @@ void ipadb_parse_user_auth(LDAP *lcontext, LDAPMessage *le,
*userauth = IPADB_USER_AUTH_NONE;
vals = ldap_get_values_len(lcontext, le, IPA_USER_AUTH_TYPE);
- if (!vals)
- return;
-
- for (i = 0; vals[i]; i++) {
- for (j = 0; userauth_table[j].name; j++) {
- if (strcasecmp(vals[i]->bv_val, userauth_table[j].name) == 0) {
- *userauth |= userauth_table[j].flag;
- break;
+ if (!vals) {
+ /* if there is no explicit ipaUserAuthType set, use objectclass */
+ vals = ldap_get_values_len(lcontext, le, "objectclass");
+ if (!vals)
+ return;
+
+ for (i = 0; vals[i]; i++) {
+ for (j = 0; objclass_table[j].name; j++) {
+ if (strcasecmp(vals[i]->bv_val, objclass_table[j].name) == 0) {
+ *userauth |= objclass_table[j].flag;
+ break;
+ }
+ }
+ }
+ } else {
+ for (i = 0; vals[i]; i++) {
+ for (j = 0; userauth_table[j].name; j++) {
+ if (strcasecmp(vals[i]->bv_val, userauth_table[j].name) == 0) {
+ *userauth |= userauth_table[j].flag;
+ break;
+ }
}
}
}
+
+ /* If neither ipaUserAuthType nor objectClass were definitive,
+ * check the krbPrincipalName to see if it is krbtgt/ or K/M one */
+ if (*userauth == IPADB_USER_AUTH_NONE) {
+ ldap_value_free_len(vals);
+ vals = ldap_get_values_len(lcontext, le, "krbprincipalname");
+ if (!vals)
+ return;
+ for (i = 0; vals[i]; i++) {
+ for (j = 0; princname_table[j].name; j++) {
+ if (strncmp(vals[i]->bv_val, princname_table[j].name,
+ strlen(princname_table[j].name)) == 0) {
+ *userauth |= princname_table[j].flag;
+ break;
+ }
+ }
+ }
+
+ }
/* If password auth is enabled, enable hardened policy too. */
if (*userauth & IPADB_USER_AUTH_PASSWORD) {
*userauth |= IPADB_USER_AUTH_HARDENED;
--
2.43.0
From 69ae9febfb4462766b3bfe3e07e76550ece97b42 Mon Sep 17 00:00:00 2001
From: Alexander Bokovoy <abokovoy@redhat.com>
Date: Fri, 24 Nov 2023 11:54:04 +0200
Subject: [PATCH 2/4] ipa-kdb: when applying ticket policy, do not deny PKINIT
PKINIT differs from other pre-authentication methods by the fact that it
can be matched indepedently of the user authentication types via certmap
plugin in KDC.
Since PKINIT is a strong authentication method, allow its authentication
indicator and only apply the ticket policy.
Fixes: https://pagure.io/freeipa/issue/9485
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Francisco Trivino <ftrivino@redhat.com>
---
daemons/ipa-kdb/ipa_kdb_kdcpolicy.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/daemons/ipa-kdb/ipa_kdb_kdcpolicy.c b/daemons/ipa-kdb/ipa_kdb_kdcpolicy.c
index 436ee0e62..2802221c7 100644
--- a/daemons/ipa-kdb/ipa_kdb_kdcpolicy.c
+++ b/daemons/ipa-kdb/ipa_kdb_kdcpolicy.c
@@ -119,11 +119,8 @@ ipa_kdcpolicy_check_as(krb5_context context, krb5_kdcpolicy_moddata moddata,
pol_limits = &(ied->pol_limits[IPADB_USER_AUTH_IDX_RADIUS]);
} else if (strcmp(auth_indicator, "pkinit") == 0) {
valid_auth_indicators++;
- if (!(ua & IPADB_USER_AUTH_PKINIT)) {
- *status = "PKINIT pre-authentication not allowed for this user.";
- kerr = KRB5KDC_ERR_POLICY;
- goto done;
- }
+ /* allow PKINIT unconditionally -- it has passed already at this
+ * point so some certificate was useful, only apply the limits */
pol_limits = &(ied->pol_limits[IPADB_USER_AUTH_IDX_PKINIT]);
} else if (strcmp(auth_indicator, "hardened") == 0) {
valid_auth_indicators++;
--
2.43.0
From 62c44c9e69aa2721990ca3628434713e1af6f59b Mon Sep 17 00:00:00 2001
From: Alexander Bokovoy <abokovoy@redhat.com>
Date: Fri, 24 Nov 2023 12:20:55 +0200
Subject: [PATCH 3/4] ipa-kdb: clarify user auth table mapping use of
_AUTH_PASSWORD
Related: https://pagure.io/freeipa/issue/9485
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Francisco Trivino <ftrivino@redhat.com>
---
daemons/ipa-kdb/ipa_kdb.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/daemons/ipa-kdb/ipa_kdb.c b/daemons/ipa-kdb/ipa_kdb.c
index dbb98dba6..4e6cacf24 100644
--- a/daemons/ipa-kdb/ipa_kdb.c
+++ b/daemons/ipa-kdb/ipa_kdb.c
@@ -195,6 +195,9 @@ done:
return base;
}
+/* In this table all _AUTH_PASSWORD entries will be
+ * expanded to include _AUTH_HARDENED in ipadb_parse_user_auth()
+ * which means there is no need to explicitly add it here */
static const struct {
const char *name;
enum ipadb_user_auth flag;
--
2.43.0
From c3bc938650b19a51706d8ccd98cdf8deaa26dc28 Mon Sep 17 00:00:00 2001
From: Alexander Bokovoy <abokovoy@redhat.com>
Date: Fri, 24 Nov 2023 13:00:48 +0200
Subject: [PATCH 4/4] ipatests: make sure PKINIT enrollment works with a strict
policy
Previously, for a global policy which does not include
'password', krb5kdc restart was failing. Now it should succeed.
We set admin user authentication type to PASSWORD to simplify
configuration in the test.
What matters here is that global policy does not include PKINIT and that
means a code in the ticket policy check will allow PKINIT implicitly
rather than explicitly.
Related: https://pagure.io/freeipa/issue/9485
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Francisco Trivino <ftrivino@redhat.com>
---
.../test_integration/test_pkinit_install.py | 26 +++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/ipatests/test_integration/test_pkinit_install.py b/ipatests/test_integration/test_pkinit_install.py
index caa0e6a34..5c2e7af02 100644
--- a/ipatests/test_integration/test_pkinit_install.py
+++ b/ipatests/test_integration/test_pkinit_install.py
@@ -23,6 +23,24 @@ class TestPkinitClientInstall(IntegrationTest):
def install(cls, mh):
tasks.install_master(cls.master)
+ def enforce_password_and_otp(self):
+ """enforce otp by default and password for admin """
+ self.master.run_command(
+ [
+ "ipa",
+ "config-mod",
+ "--user-auth-type=otp",
+ ]
+ )
+ self.master.run_command(
+ [
+ "ipa",
+ "user-mod",
+ "admin",
+ "--user-auth-type=password",
+ ]
+ )
+
def add_certmaperule(self):
"""add certmap rule to map SAN dNSName to host entry"""
self.master.run_command(
@@ -86,6 +104,14 @@ class TestPkinitClientInstall(IntegrationTest):
cabundle = self.master.get_file_contents(paths.KDC_CA_BUNDLE_PEM)
client.put_file_contents(self.tmpbundle, cabundle)
+ def test_restart_krb5kdc(self):
+ tasks.kinit_admin(self.master)
+ self.enforce_password_and_otp()
+ self.master.run_command(['systemctl', 'stop', 'krb5kdc.service'])
+ self.master.run_command(['systemctl', 'start', 'krb5kdc.service'])
+ self.master.run_command(['systemctl', 'stop', 'kadmin.service'])
+ self.master.run_command(['systemctl', 'start', 'kadmin.service'])
+
def test_client_install_pkinit(self):
tasks.kinit_admin(self.master)
self.add_certmaperule()
--
2.43.0
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