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Code

s4:kdc: Add helper function to determine whether authentication to a server is allowed

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Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This commit is contained in:
Joseph Sutton 2023-06-16 11:20:04 +12:00 committed by Andrew Bartlett
parent af95ec0b3f
commit 071ad174d9
3 changed files with 93 additions and 1 deletions
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82
source4/kdc/pac-glue.c
View File

@ -31,6 +31,7 @@
#include "auth/auth_sam_reply.h"
#include "auth/kerberos/kerberos.h"
#include "auth/kerberos/pac_utils.h"
#include "auth/authn_policy.h"
#include "libcli/security/security.h"
#include "libds/common/flags.h"
#include "librpc/gen_ndr/ndr_krb5pac.h"
@ -38,6 +39,7 @@
#include "source4/auth/auth.h"
#include "source4/dsdb/common/util.h"
#include "source4/dsdb/samdb/samdb.h"
#include "source4/kdc/authn_policy_util.h"
#include "source4/kdc/samba_kdc.h"
#include "source4/kdc/pac-glue.h"
#include "source4/kdc/ad_claims.h"
@ -1633,6 +1635,86 @@ WERROR samba_rodc_confirm_user_is_allowed(uint32_t num_object_sids,
return werr;
}
/*
* Perform an access check for the client attempting to authenticate to the
* server. ‘client_info’ must be talloc-allocated so that we can make a
* reference to it.
*/
krb5_error_code samba_kdc_allowed_to_authenticate_to(TALLOC_CTX *mem_ctx,
struct ldb_context *samdb,
struct loadparm_context *lp_ctx,
const struct samba_kdc_entry *client,
const struct auth_user_info_dc *client_info,
const struct samba_kdc_entry *server,
struct authn_audit_info **server_audit_info_out,
NTSTATUS *status_out)
{
krb5_error_code ret = 0;
NTSTATUS status;
_UNUSED_ NTSTATUS _status;
struct dom_sid server_sid = {};
const struct authn_server_policy *server_policy = server->server_policy;
if (status_out != NULL) {
*status_out = NT_STATUS_OK;
}
ret = samdb_result_dom_sid_buf(server->msg, "objectSid", &server_sid);
if (ret) {
/*
* Ignore the return status — we are already in an error path,
* and overwriting the real error code with the audit info
* status is unhelpful.
*/
_status = authn_server_policy_audit_info(mem_ctx,
server_policy,
client_info,
AUTHN_AUDIT_EVENT_OTHER_ERROR,
AUTHN_AUDIT_REASON_NONE,
dsdb_ldb_err_to_ntstatus(ret),
server_audit_info_out);
goto out;
}
if (dom_sid_equal(&client_info->sids[PRIMARY_USER_SID_INDEX].sid, &server_sid)) {
/* Authenticating to ourselves is always allowed. */
status = authn_server_policy_audit_info(mem_ctx,
server_policy,
client_info,
AUTHN_AUDIT_EVENT_OK,
AUTHN_AUDIT_REASON_NONE,
NT_STATUS_OK,
server_audit_info_out);
if (!NT_STATUS_IS_OK(status)) {
ret = KRB5KRB_ERR_GENERIC;
}
goto out;
}
status = authn_policy_authenticate_to_service(mem_ctx,
samdb,
lp_ctx,
AUTHN_POLICY_AUTH_TYPE_KERBEROS,
client_info,
server_policy,
server_audit_info_out);
if (!NT_STATUS_IS_OK(status)) {
if (status_out != NULL) {
*status_out = status;
}
if (NT_STATUS_EQUAL(status, NT_STATUS_AUTHENTICATION_FIREWALL_FAILED)) {
ret = KRB5KDC_ERR_POLICY;
} else if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
ret = KRB5KDC_ERR_POLICY;
} else {
ret = KRB5KRB_ERR_GENERIC;
}
}
out:
return ret;
}
static krb5_error_code samba_kdc_add_domain_group_sid(TALLOC_CTX *mem_ctx,
struct PAC_DEVICE_INFO *info,
const struct netr_SidAttr *sid)

10
source4/kdc/pac-glue.h
View File

@ -128,6 +128,7 @@ krb5_error_code samba_kdc_verify_pac(TALLOC_CTX *mem_ctx,
const krb5_const_pac *device_pac,
krb5_const_pac pac);
struct authn_audit_info;
krb5_error_code samba_kdc_update_pac(TALLOC_CTX *mem_ctx,
krb5_context context,
struct ldb_context *samdb,
@ -160,3 +161,12 @@ NTSTATUS samba_kdc_get_requester_sid_blob(TALLOC_CTX *mem_ctx,
NTSTATUS samba_kdc_get_claims_blob(TALLOC_CTX *mem_ctx,
const struct samba_kdc_entry *p,
DATA_BLOB **_claims_blob);
krb5_error_code samba_kdc_allowed_to_authenticate_to(TALLOC_CTX *mem_ctx,
struct ldb_context *samdb,
struct loadparm_context *lp_ctx,
const struct samba_kdc_entry *client,
const struct auth_user_info_dc *client_info,
const struct samba_kdc_entry *server,
struct authn_audit_info **server_audit_info_out,
NTSTATUS *status_out);

2
source4/kdc/wscript_build
View File

@ -123,7 +123,7 @@ bld.SAMBA_SUBSYSTEM('sdb_kdb',
bld.SAMBA_SUBSYSTEM('PAC_GLUE',
source='pac-glue.c pac-blobs.c',
deps='ldb auth4_sam common_auth samba-credentials samba-hostconfig com_err ad_claims'
deps='ldb auth4_sam common_auth samba-credentials samba-hostconfig com_err ad_claims authn_policy authn_policy_util'
)
bld.SAMBA_LIBRARY('pac',