1
0
mirror of https://github.com/samba-team/samba.git synced 2024-12-23 17:34:34 +03:00
samba-mirror/source3/libads/authdata.c
Andreas Schneider bc2a2399e5 s3:gse: Implement gensec_gse_security_by_oid()
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
2024-05-14 10:18:31 +00:00

348 lines
8.9 KiB
C

/*
Unix SMB/CIFS implementation.
kerberos authorization data (PAC) utility library
Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
Copyright (C) Andrew Tridgell 2001
Copyright (C) Luke Howard 2002-2003
Copyright (C) Stefan Metzmacher 2004-2005
Copyright (C) Guenther Deschner 2005,2007,2008
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 "includes.h"
#include "librpc/gen_ndr/ndr_krb5pac.h"
#include "smb_krb5.h"
#include "libads/kerberos_proto.h"
#include "auth/common_auth.h"
#include "lib/param/param.h"
#include "librpc/crypto/gse.h"
#include "auth/gensec/gensec.h"
#include "../libcli/auth/spnego.h"
#include "lib/util/asn1.h"
#ifdef HAVE_KRB5
#include "auth/kerberos/pac_utils.h"
struct smb_krb5_context;
/*
generate a krb5 GSS-API wrapper packet given a ticket
*/
static DATA_BLOB spnego_gen_krb5_wrap(
TALLOC_CTX *ctx, const DATA_BLOB ticket, const uint8_t tok_id[2])
{
ASN1_DATA *data;
DATA_BLOB ret = data_blob_null;
data = asn1_init(talloc_tos(), ASN1_MAX_TREE_DEPTH);
if (data == NULL) {
return data_blob_null;
}
if (!asn1_push_tag(data, ASN1_APPLICATION(0))) goto err;
if (!asn1_write_OID(data, OID_KERBEROS5)) goto err;
if (!asn1_write(data, tok_id, 2)) goto err;
if (!asn1_write(data, ticket.data, ticket.length)) goto err;
if (!asn1_pop_tag(data)) goto err;
if (!asn1_extract_blob(data, ctx, &ret)) {
goto err;
}
asn1_free(data);
data = NULL;
err:
if (data != NULL) {
if (asn1_has_error(data)) {
DEBUG(1, ("Failed to build krb5 wrapper at offset %d\n",
(int)asn1_current_ofs(data)));
}
asn1_free(data);
}
return ret;
}
/*
* Given the username/password, do a kinit, store the ticket in
* cache_name if specified, and return the PAC_LOGON_INFO (the
* structure containing the important user information such as
* groups).
*/
NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
const char *name,
const char *pass,
time_t time_offset,
time_t *expire_time,
time_t *renew_till_time,
const char *cache_name,
bool request_pac,
bool add_netbios_addr,
time_t renewable_time,
const char *impersonate_princ_s,
const char *local_service,
char **_canon_principal,
char **_canon_realm,
struct PAC_DATA_CTR **_pac_data_ctr)
{
krb5_error_code ret;
NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
DATA_BLOB tkt = data_blob_null;
DATA_BLOB tkt_wrapped = data_blob_null;
DATA_BLOB ap_rep = data_blob_null;
DATA_BLOB sesskey1 = data_blob_null;
const char *auth_princ = NULL;
const char *cc = NULL;
struct auth_session_info *session_info;
struct gensec_security *gensec_server_context;
const struct gensec_security_ops **backends;
struct gensec_settings *gensec_settings;
size_t idx = 0;
struct auth4_context *auth_context;
struct loadparm_context *lp_ctx;
struct PAC_DATA_CTR *pac_data_ctr = NULL;
char *canon_principal = NULL;
char *canon_realm = NULL;
krb5_context ctx = NULL;
krb5_ccache ccid = NULL;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
ZERO_STRUCT(tkt);
ZERO_STRUCT(ap_rep);
ZERO_STRUCT(sesskey1);
if (!name || !pass) {
status = NT_STATUS_INVALID_PARAMETER;
goto out;
}
if (_canon_principal != NULL) {
*_canon_principal = NULL;
}
if (_canon_realm != NULL) {
*_canon_realm = NULL;
}
if (cache_name) {
cc = cache_name;
} else {
char *ccname = NULL;
ret = smb_krb5_init_context_common(&ctx);
if (ret != 0) {
status = krb5_to_nt_status(ret);
goto out;
}
ret = smb_krb5_cc_new_unique_memory(ctx,
tmp_ctx,
&ccname,
&ccid);
if (ret != 0) {
status = krb5_to_nt_status(ret);
goto out;
}
cc = ccname;
}
if (!strchr_m(name, '@')) {
auth_princ = talloc_asprintf(mem_ctx, "%s@%s", name,
lp_realm());
} else {
auth_princ = name;
}
NT_STATUS_HAVE_NO_MEMORY(auth_princ);
ret = kerberos_kinit_password_ext(auth_princ,
pass,
time_offset,
expire_time,
renew_till_time,
cc,
request_pac,
add_netbios_addr,
renewable_time,
tmp_ctx,
&canon_principal,
&canon_realm,
&status);
if (ret) {
DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
auth_princ, error_message(ret), ret));
/* status already set */
goto out;
}
DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
if (expire_time) {
DEBUGADD(10,("\tvalid until: %s (%d)\n",
http_timestring(talloc_tos(), *expire_time),
(int)*expire_time));
}
if (renew_till_time) {
DEBUGADD(10,("\trenewable till: %s (%d)\n",
http_timestring(talloc_tos(), *renew_till_time),
(int)*renew_till_time));
}
/* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
* in that case fallback to NTLM - gd */
if (expire_time && renew_till_time &&
(*expire_time == 0) && (*renew_till_time == 0)) {
status = NT_STATUS_INVALID_LOGON_TYPE;
goto out;
}
ret = ads_krb5_cli_get_ticket(mem_ctx,
local_service,
time_offset,
&tkt,
&sesskey1,
0,
cc,
NULL,
impersonate_princ_s);
if (ret) {
DEBUG(1,("failed to get ticket for %s: %s\n",
local_service, error_message(ret)));
if (impersonate_princ_s) {
DEBUGADD(1,("tried S4U2SELF impersonation as: %s\n",
impersonate_princ_s));
}
status = krb5_to_nt_status(ret);
goto out;
}
/* wrap that up in a nice GSS-API wrapping */
tkt_wrapped = spnego_gen_krb5_wrap(tmp_ctx, tkt, TOK_ID_KRB_AP_REQ);
if (tkt_wrapped.data == NULL) {
status = NT_STATUS_NO_MEMORY;
goto out;
}
auth_context = auth4_context_for_PAC_DATA_CTR(tmp_ctx);
if (auth_context == NULL) {
status = NT_STATUS_NO_MEMORY;
goto out;
}
lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
if (lp_ctx == NULL) {
status = NT_STATUS_INVALID_SERVER_STATE;
DEBUG(10, ("loadparm_init_s3 failed\n"));
goto out;
}
gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
if (gensec_settings == NULL) {
status = NT_STATUS_NO_MEMORY;
DEBUG(10, ("lpcfg_gensec_settings failed\n"));
goto out;
}
backends = talloc_zero_array(gensec_settings,
const struct gensec_security_ops *, 2);
if (backends == NULL) {
status = NT_STATUS_NO_MEMORY;
goto out;
}
gensec_settings->backends = backends;
gensec_init();
backends[idx++] = gensec_gse_security_by_oid(GENSEC_OID_KERBEROS5);
status = gensec_server_start(tmp_ctx, gensec_settings,
auth_context, &gensec_server_context);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, (__location__ "Failed to start server-side GENSEC to validate a Kerberos ticket: %s\n", nt_errstr(status)));
goto out;
}
talloc_unlink(tmp_ctx, lp_ctx);
talloc_unlink(tmp_ctx, gensec_settings);
talloc_unlink(tmp_ctx, auth_context);
/* Session info is not complete, do not pass to auth log */
gensec_want_feature(gensec_server_context, GENSEC_FEATURE_NO_AUTHZ_LOG);
status = gensec_start_mech_by_oid(gensec_server_context, GENSEC_OID_KERBEROS5);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, (__location__ "Failed to start server-side GENSEC krb5 to validate a Kerberos ticket: %s\n", nt_errstr(status)));
goto out;
}
/* Do a client-server update dance */
status = gensec_update(gensec_server_context, tmp_ctx, tkt_wrapped, &ap_rep);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("gensec_update() failed: %s\n", nt_errstr(status)));
goto out;
}
/* Now return the PAC information to the callers. We ignore
* the session_info and instead pick out the PAC via the
* private_data on the auth_context */
status = gensec_session_info(gensec_server_context, tmp_ctx, &session_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Unable to obtain PAC via gensec_session_info\n"));
goto out;
}
pac_data_ctr = auth4_context_get_PAC_DATA_CTR(auth_context, mem_ctx);
if (pac_data_ctr == NULL) {
DEBUG(1,("no PAC\n"));
status = NT_STATUS_INVALID_PARAMETER;
goto out;
}
*_pac_data_ctr = talloc_move(mem_ctx, &pac_data_ctr);
if (_canon_principal != NULL) {
*_canon_principal = talloc_move(mem_ctx, &canon_principal);
}
if (_canon_realm != NULL) {
*_canon_realm = talloc_move(mem_ctx, &canon_realm);
}
out:
if (ccid != NULL) {
krb5_cc_destroy(ctx, ccid);
ccid = NULL;
}
if (ctx != NULL) {
krb5_free_context(ctx);
ctx = NULL;
}
talloc_free(tmp_ctx);
data_blob_free(&tkt);
data_blob_free(&ap_rep);
data_blob_free(&sesskey1);
return status;
}
#endif