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/*
Unix SMB/CIFS implementation.
krb5 set password implementation
Copyright (C) Andrew Tridgell 2001
Copyright (C) Remus Koos 2001 (remuskoos@yahoo.com)
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 "smb_krb5.h"
#include "libads/kerberos_proto.h"
#include "../lib/util/asn1.h"
#ifdef HAVE_KRB5
/* Those are defined by kerberos-set-passwd-02.txt and are probably
* not supported by M$ implementation */
#define KRB5_KPASSWD_POLICY_REJECT 8
#define KRB5_KPASSWD_BAD_PRINCIPAL 9
#define KRB5_KPASSWD_ETYPE_NOSUPP 10
/*
* we've got to be able to distinguish KRB_ERRORs from other
* requests - valid response for CHPW v2 replies.
*/
static krb5_error_code kpasswd_err_to_krb5_err(krb5_error_code res_code)
{
switch (res_code) {
case KRB5_KPASSWD_ACCESSDENIED:
return KRB5KDC_ERR_BADOPTION;
case KRB5_KPASSWD_INITIAL_FLAG_NEEDED:
return KRB5KDC_ERR_BADOPTION;
/* return KV5M_ALT_METHOD; MIT-only define */
case KRB5_KPASSWD_ETYPE_NOSUPP:
return KRB5KDC_ERR_ETYPE_NOSUPP;
case KRB5_KPASSWD_BAD_PRINCIPAL:
return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
case KRB5_KPASSWD_POLICY_REJECT:
case KRB5_KPASSWD_SOFTERROR:
return KRB5KDC_ERR_POLICY;
default:
return KRB5KRB_ERR_GENERIC;
}
}
ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *principal,
const char *newpw, int time_offset)
{
ADS_STATUS aret;
krb5_error_code ret = 0;
krb5_context context = NULL;
krb5_principal princ = NULL;
krb5_ccache ccache = NULL;
int result_code;
krb5_data result_code_string = { 0 };
krb5_data result_string = { 0 };
ret = smb_krb5_init_context_common(&context);
if (ret) {
DBG_ERR("kerberos init context failed (%s)\n",
error_message(ret));
return ADS_ERROR_KRB5(ret);
}
if (principal) {
ret = smb_krb5_parse_name(context, principal, &princ);
if (ret) {
krb5_free_context(context);
DEBUG(1, ("Failed to parse %s (%s)\n", principal,
error_message(ret)));
return ADS_ERROR_KRB5(ret);
}
}
if (time_offset != 0) {
krb5_set_real_time(context, time(NULL) + time_offset, 0);
}
ret = krb5_cc_default(context, &ccache);
if (ret) {
krb5_free_principal(context, princ);
krb5_free_context(context);
DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
return ADS_ERROR_KRB5(ret);
}
ret = krb5_set_password_using_ccache(context,
ccache,
discard_const_p(char, newpw),
princ,
&result_code,
&result_code_string,
&result_string);
if (ret) {
DEBUG(1, ("krb5_set_password failed (%s)\n", error_message(ret)));
aret = ADS_ERROR_KRB5(ret);
goto done;
}
if (result_code != KRB5_KPASSWD_SUCCESS) {
ret = kpasswd_err_to_krb5_err(result_code);
DEBUG(1, ("krb5_set_password failed (%s)\n", error_message(ret)));
aret = ADS_ERROR_KRB5(ret);
goto done;
}
aret = ADS_SUCCESS;
done:
smb_krb5_free_data_contents(context, &result_code_string);
smb_krb5_free_data_contents(context, &result_string);
krb5_free_principal(context, princ);
krb5_cc_close(context, ccache);
krb5_free_context(context);
return aret;
}
/*
we use a prompter to avoid a crash bug in the kerberos libs when
dealing with empty passwords
this prompter is just a string copy ...
*/
static krb5_error_code
kerb_prompter(krb5_context ctx, void *data,
const char *name,
const char *banner,
int num_prompts,
krb5_prompt prompts[])
{
if (num_prompts == 0) return 0;
memset(prompts[0].reply->data, 0, prompts[0].reply->length);
if (prompts[0].reply->length > 0) {
if (data) {
strncpy((char *)prompts[0].reply->data,
(const char *)data,
prompts[0].reply->length-1);
prompts[0].reply->length = strlen((const char *)prompts[0].reply->data);
} else {
prompts[0].reply->length = 0;
}
}
return 0;
}
static ADS_STATUS ads_krb5_chg_password(const char *kdc_host,
const char *principal,
const char *oldpw,
const char *newpw,
int time_offset)
{
ADS_STATUS aret;
krb5_error_code ret;
krb5_context context = NULL;
krb5_principal princ;
krb5_get_init_creds_opt *opts = NULL;
krb5_creds creds;
char *chpw_princ = NULL, *password;
char *realm = NULL;
int result_code;
krb5_data result_code_string = { 0 };
krb5_data result_string = { 0 };
smb_krb5_addresses *addr = NULL;
ret = smb_krb5_init_context_common(&context);
if (ret) {
DBG_ERR("kerberos init context failed (%s)\n",
error_message(ret));
return ADS_ERROR_KRB5(ret);
}
if ((ret = smb_krb5_parse_name(context, principal, &princ))) {
krb5_free_context(context);
DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret)));
return ADS_ERROR_KRB5(ret);
}
ret = krb5_get_init_creds_opt_alloc(context, &opts);
if (ret != 0) {
krb5_free_context(context);
DBG_WARNING("krb5_get_init_creds_opt_alloc failed: %s\n",
error_message(ret));
return ADS_ERROR_KRB5(ret);
}
krb5_get_init_creds_opt_set_tkt_life(opts, 5 * 60);
krb5_get_init_creds_opt_set_renew_life(opts, 0);
krb5_get_init_creds_opt_set_forwardable(opts, 0);
krb5_get_init_creds_opt_set_proxiable(opts, 0);
#ifdef SAMBA4_USES_HEIMDAL
krb5_get_init_creds_opt_set_win2k(context, opts, true);
krb5_get_init_creds_opt_set_canonicalize(context, opts, true);
#else /* MIT */
#if 0
/*
* FIXME
*
* Due to an upstream MIT Kerberos bug, this feature is not
* not working. Affection versions (2019-10-09): <= 1.17
*
* Reproducer:
* kinit -C aDmInIsTrAtOr@ACME.COM -S kadmin/changepw@ACME.COM
*
* This is NOT a problem if the service is a krbtgt.
*
* https://bugzilla.samba.org/show_bug.cgi?id=14155
*/
krb5_get_init_creds_opt_set_canonicalize(opts, true);
#endif
#endif /* MIT */
/* note that heimdal will fill in the local addresses if the addresses
* in the creds_init_opt are all empty and then later fail with invalid
* address, sending our local netbios krb5 address - just like windows
* - avoids this - gd */
ret = smb_krb5_gen_netbios_krb5_address(&addr, lp_netbios_name());
if (ret) {
krb5_free_principal(context, princ);
krb5_get_init_creds_opt_free(context, opts);
krb5_free_context(context);
return ADS_ERROR_KRB5(ret);
}
krb5_get_init_creds_opt_set_address_list(opts, addr->addrs);
realm = smb_krb5_principal_get_realm(NULL, context, princ);
/* We have to obtain an INITIAL changepw ticket for changing password */
if (asprintf(&chpw_princ, "kadmin/changepw@%s", realm) == -1) {
krb5_free_principal(context, princ);
krb5_get_init_creds_opt_free(context, opts);
smb_krb5_free_addresses(context, addr);
krb5_free_context(context);
TALLOC_FREE(realm);
DEBUG(1, ("ads_krb5_chg_password: asprintf fail\n"));
return ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
}
TALLOC_FREE(realm);
password = SMB_STRDUP(oldpw);
ret = krb5_get_init_creds_password(context, &creds, princ, password,
kerb_prompter, NULL,
0, chpw_princ, opts);
krb5_get_init_creds_opt_free(context, opts);
smb_krb5_free_addresses(context, addr);
SAFE_FREE(chpw_princ);
SAFE_FREE(password);
if (ret) {
if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) {
DEBUG(1,("Password incorrect while getting initial ticket\n"));
} else {
DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret)));
}
krb5_free_principal(context, princ);
krb5_free_context(context);
return ADS_ERROR_KRB5(ret);
}
ret = krb5_set_password(context,
&creds,
discard_const_p(char, newpw),
NULL,
&result_code,
&result_code_string,
&result_string);
if (ret) {
DEBUG(1, ("krb5_change_password failed (%s)\n", error_message(ret)));
aret = ADS_ERROR_KRB5(ret);
goto done;
}
if (result_code != KRB5_KPASSWD_SUCCESS) {
ret = kpasswd_err_to_krb5_err(result_code);
DEBUG(1, ("krb5_change_password failed (%s)\n", error_message(ret)));
aret = ADS_ERROR_KRB5(ret);
goto done;
}
aret = ADS_SUCCESS;
done:
smb_krb5_free_data_contents(context, &result_code_string);
smb_krb5_free_data_contents(context, &result_string);
krb5_free_principal(context, princ);
krb5_free_context(context);
return aret;
}
ADS_STATUS kerberos_set_password(const char *kpasswd_server,
const char *auth_principal,
const char *auth_password,
const char *target_principal,
const char *new_password, int time_offset)
{
int ret;
if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset, NULL))) {
DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret)));
return ADS_ERROR_KRB5(ret);
}
if (!strcmp(auth_principal, target_principal)) {
return ads_krb5_chg_password(kpasswd_server, target_principal,
auth_password, new_password,
time_offset);
} else {
return ads_krb5_set_password(kpasswd_server, target_principal,
new_password, time_offset);
}
}
#endif
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