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123584294c
This partially reverts 303b7e59a2
.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14155
Pair-Programmed-With: Isaac Boukris <iboukris@redhat.com>
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Isaac Boukris <iboukris@redhat.com>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Sat Oct 12 17:39:13 UTC 2019 on sn-devel-184
330 lines
9.2 KiB
C
330 lines
9.2 KiB
C
/*
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Unix SMB/CIFS implementation.
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krb5 set password implementation
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Copyright (C) Andrew Tridgell 2001
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Copyright (C) Remus Koos 2001 (remuskoos@yahoo.com)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "smb_krb5.h"
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#include "libads/kerberos_proto.h"
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#include "../lib/util/asn1.h"
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#ifdef HAVE_KRB5
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/* Those are defined by kerberos-set-passwd-02.txt and are probably
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* not supported by M$ implementation */
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#define KRB5_KPASSWD_POLICY_REJECT 8
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#define KRB5_KPASSWD_BAD_PRINCIPAL 9
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#define KRB5_KPASSWD_ETYPE_NOSUPP 10
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/*
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* we've got to be able to distinguish KRB_ERRORs from other
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* requests - valid response for CHPW v2 replies.
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*/
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static krb5_error_code kpasswd_err_to_krb5_err(krb5_error_code res_code)
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{
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switch (res_code) {
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case KRB5_KPASSWD_ACCESSDENIED:
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return KRB5KDC_ERR_BADOPTION;
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case KRB5_KPASSWD_INITIAL_FLAG_NEEDED:
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return KRB5KDC_ERR_BADOPTION;
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/* return KV5M_ALT_METHOD; MIT-only define */
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case KRB5_KPASSWD_ETYPE_NOSUPP:
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return KRB5KDC_ERR_ETYPE_NOSUPP;
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case KRB5_KPASSWD_BAD_PRINCIPAL:
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return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
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case KRB5_KPASSWD_POLICY_REJECT:
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case KRB5_KPASSWD_SOFTERROR:
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return KRB5KDC_ERR_POLICY;
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default:
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return KRB5KRB_ERR_GENERIC;
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}
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}
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ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *principal,
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const char *newpw, int time_offset)
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{
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ADS_STATUS aret;
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krb5_error_code ret = 0;
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krb5_context context = NULL;
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krb5_principal princ = NULL;
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krb5_ccache ccache = NULL;
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int result_code;
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krb5_data result_code_string = { 0 };
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krb5_data result_string = { 0 };
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ret = smb_krb5_init_context_common(&context);
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if (ret) {
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DBG_ERR("kerberos init context failed (%s)\n",
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error_message(ret));
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return ADS_ERROR_KRB5(ret);
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}
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if (principal) {
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ret = smb_krb5_parse_name(context, principal, &princ);
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if (ret) {
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krb5_free_context(context);
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DEBUG(1, ("Failed to parse %s (%s)\n", principal,
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error_message(ret)));
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return ADS_ERROR_KRB5(ret);
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}
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}
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if (time_offset != 0) {
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krb5_set_real_time(context, time(NULL) + time_offset, 0);
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}
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ret = krb5_cc_default(context, &ccache);
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if (ret) {
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krb5_free_principal(context, princ);
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krb5_free_context(context);
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DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
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return ADS_ERROR_KRB5(ret);
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}
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ret = krb5_set_password_using_ccache(context,
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ccache,
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discard_const_p(char, newpw),
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princ,
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&result_code,
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&result_code_string,
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&result_string);
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if (ret) {
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DEBUG(1, ("krb5_set_password failed (%s)\n", error_message(ret)));
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aret = ADS_ERROR_KRB5(ret);
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goto done;
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}
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if (result_code != KRB5_KPASSWD_SUCCESS) {
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ret = kpasswd_err_to_krb5_err(result_code);
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DEBUG(1, ("krb5_set_password failed (%s)\n", error_message(ret)));
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aret = ADS_ERROR_KRB5(ret);
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goto done;
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}
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aret = ADS_SUCCESS;
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done:
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smb_krb5_free_data_contents(context, &result_code_string);
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smb_krb5_free_data_contents(context, &result_string);
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krb5_free_principal(context, princ);
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krb5_cc_close(context, ccache);
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krb5_free_context(context);
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return aret;
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}
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/*
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we use a prompter to avoid a crash bug in the kerberos libs when
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dealing with empty passwords
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this prompter is just a string copy ...
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*/
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static krb5_error_code
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kerb_prompter(krb5_context ctx, void *data,
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const char *name,
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const char *banner,
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int num_prompts,
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krb5_prompt prompts[])
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{
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if (num_prompts == 0) return 0;
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memset(prompts[0].reply->data, 0, prompts[0].reply->length);
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if (prompts[0].reply->length > 0) {
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if (data) {
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strncpy((char *)prompts[0].reply->data,
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(const char *)data,
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prompts[0].reply->length-1);
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prompts[0].reply->length = strlen((const char *)prompts[0].reply->data);
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} else {
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prompts[0].reply->length = 0;
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}
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}
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return 0;
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}
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static ADS_STATUS ads_krb5_chg_password(const char *kdc_host,
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const char *principal,
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const char *oldpw,
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const char *newpw,
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int time_offset)
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{
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ADS_STATUS aret;
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krb5_error_code ret;
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krb5_context context = NULL;
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krb5_principal princ;
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krb5_get_init_creds_opt *opts = NULL;
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krb5_creds creds;
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char *chpw_princ = NULL, *password;
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char *realm = NULL;
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int result_code;
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krb5_data result_code_string = { 0 };
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krb5_data result_string = { 0 };
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smb_krb5_addresses *addr = NULL;
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ret = smb_krb5_init_context_common(&context);
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if (ret) {
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DBG_ERR("kerberos init context failed (%s)\n",
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error_message(ret));
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return ADS_ERROR_KRB5(ret);
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}
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if ((ret = smb_krb5_parse_name(context, principal, &princ))) {
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krb5_free_context(context);
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DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret)));
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return ADS_ERROR_KRB5(ret);
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}
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ret = krb5_get_init_creds_opt_alloc(context, &opts);
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if (ret != 0) {
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krb5_free_context(context);
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DBG_WARNING("krb5_get_init_creds_opt_alloc failed: %s\n",
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error_message(ret));
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return ADS_ERROR_KRB5(ret);
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}
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krb5_get_init_creds_opt_set_tkt_life(opts, 5 * 60);
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krb5_get_init_creds_opt_set_renew_life(opts, 0);
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krb5_get_init_creds_opt_set_forwardable(opts, 0);
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krb5_get_init_creds_opt_set_proxiable(opts, 0);
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#ifdef SAMBA4_USES_HEIMDAL
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krb5_get_init_creds_opt_set_win2k(context, opts, true);
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krb5_get_init_creds_opt_set_canonicalize(context, opts, true);
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#else /* MIT */
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#if 0
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/*
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* FIXME
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*
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* Due to an upstream MIT Kerberos bug, this feature is not
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* not working. Affection versions (2019-10-09): <= 1.17
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*
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* Reproducer:
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* kinit -C aDmInIsTrAtOr@ACME.COM -S kadmin/changepw@ACME.COM
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*
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* This is NOT a problem if the service is a krbtgt.
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*
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* https://bugzilla.samba.org/show_bug.cgi?id=14155
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*/
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krb5_get_init_creds_opt_set_canonicalize(opts, true);
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#endif
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#endif /* MIT */
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/* note that heimdal will fill in the local addresses if the addresses
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* in the creds_init_opt are all empty and then later fail with invalid
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* address, sending our local netbios krb5 address - just like windows
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* - avoids this - gd */
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ret = smb_krb5_gen_netbios_krb5_address(&addr, lp_netbios_name());
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if (ret) {
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krb5_free_principal(context, princ);
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krb5_get_init_creds_opt_free(context, opts);
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krb5_free_context(context);
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return ADS_ERROR_KRB5(ret);
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}
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krb5_get_init_creds_opt_set_address_list(opts, addr->addrs);
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realm = smb_krb5_principal_get_realm(NULL, context, princ);
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/* We have to obtain an INITIAL changepw ticket for changing password */
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if (asprintf(&chpw_princ, "kadmin/changepw@%s", realm) == -1) {
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krb5_free_principal(context, princ);
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krb5_get_init_creds_opt_free(context, opts);
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smb_krb5_free_addresses(context, addr);
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krb5_free_context(context);
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TALLOC_FREE(realm);
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DEBUG(1, ("ads_krb5_chg_password: asprintf fail\n"));
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return ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
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}
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TALLOC_FREE(realm);
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password = SMB_STRDUP(oldpw);
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ret = krb5_get_init_creds_password(context, &creds, princ, password,
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kerb_prompter, NULL,
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0, chpw_princ, opts);
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krb5_get_init_creds_opt_free(context, opts);
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smb_krb5_free_addresses(context, addr);
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SAFE_FREE(chpw_princ);
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SAFE_FREE(password);
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if (ret) {
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if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) {
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DEBUG(1,("Password incorrect while getting initial ticket"));
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} else {
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DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret)));
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}
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krb5_free_principal(context, princ);
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krb5_free_context(context);
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return ADS_ERROR_KRB5(ret);
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}
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ret = krb5_set_password(context,
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&creds,
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discard_const_p(char, newpw),
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NULL,
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&result_code,
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&result_code_string,
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&result_string);
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if (ret) {
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DEBUG(1, ("krb5_change_password failed (%s)\n", error_message(ret)));
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aret = ADS_ERROR_KRB5(ret);
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goto done;
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}
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if (result_code != KRB5_KPASSWD_SUCCESS) {
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ret = kpasswd_err_to_krb5_err(result_code);
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DEBUG(1, ("krb5_change_password failed (%s)\n", error_message(ret)));
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aret = ADS_ERROR_KRB5(ret);
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goto done;
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}
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aret = ADS_SUCCESS;
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done:
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smb_krb5_free_data_contents(context, &result_code_string);
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smb_krb5_free_data_contents(context, &result_string);
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krb5_free_principal(context, princ);
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krb5_free_context(context);
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return aret;
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}
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ADS_STATUS kerberos_set_password(const char *kpasswd_server,
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const char *auth_principal,
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const char *auth_password,
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const char *target_principal,
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const char *new_password, int time_offset)
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{
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int ret;
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if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset, NULL))) {
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DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret)));
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return ADS_ERROR_KRB5(ret);
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}
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if (!strcmp(auth_principal, target_principal)) {
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return ads_krb5_chg_password(kpasswd_server, target_principal,
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auth_password, new_password,
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time_offset);
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} else {
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return ads_krb5_set_password(kpasswd_server, target_principal,
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new_password, time_offset);
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}
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}
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#endif
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