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04f8c229de
This seems to be the only way to deal with mixed heimdal/MIT setups during merged build. Guenther
840 lines
23 KiB
C
840 lines
23 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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#ifdef HAVE_KRB5
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#define DEFAULT_KPASSWD_PORT 464
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#define KRB5_KPASSWD_VERS_CHANGEPW 1
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#define KRB5_KPASSWD_VERS_SETPW 0xff80
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#define KRB5_KPASSWD_VERS_SETPW_ALT 2
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#define KRB5_KPASSWD_SUCCESS 0
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#define KRB5_KPASSWD_MALFORMED 1
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#define KRB5_KPASSWD_HARDERROR 2
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#define KRB5_KPASSWD_AUTHERROR 3
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#define KRB5_KPASSWD_SOFTERROR 4
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#define KRB5_KPASSWD_ACCESSDENIED 5
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#define KRB5_KPASSWD_BAD_VERSION 6
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#define KRB5_KPASSWD_INITIAL_FLAG_NEEDED 7
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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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#define krb5_is_krb_error(packet) \
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( packet && packet->length && (((char *)packet->data)[0] == 0x7e || ((char *)packet->data)[0] == 0x5e))
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/* This implements kerberos password change protocol as specified in
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* kerb-chg-password-02.txt and kerberos-set-passwd-02.txt
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* as well as microsoft version of the protocol
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* as specified in kerberos-set-passwd-00.txt
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*/
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static DATA_BLOB encode_krb5_setpw(const char *principal, const char *password)
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{
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char* princ_part1 = NULL;
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char* princ_part2 = NULL;
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char* realm = NULL;
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char* c;
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char* princ;
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ASN1_DATA *req;
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DATA_BLOB ret;
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princ = SMB_STRDUP(principal);
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if ((c = strchr_m(princ, '/')) == NULL) {
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c = princ;
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} else {
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*c = '\0';
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c++;
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princ_part1 = princ;
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}
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princ_part2 = c;
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if ((c = strchr_m(c, '@')) != NULL) {
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*c = '\0';
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c++;
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realm = c;
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} else {
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/* We must have a realm component. */
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return data_blob_null;
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}
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req = asn1_init(talloc_tos());
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if (req == NULL) {
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return data_blob_null;
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}
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asn1_push_tag(req, ASN1_SEQUENCE(0));
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asn1_push_tag(req, ASN1_CONTEXT(0));
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asn1_write_OctetString(req, password, strlen(password));
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asn1_pop_tag(req);
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asn1_push_tag(req, ASN1_CONTEXT(1));
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asn1_push_tag(req, ASN1_SEQUENCE(0));
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asn1_push_tag(req, ASN1_CONTEXT(0));
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asn1_write_Integer(req, 1);
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asn1_pop_tag(req);
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asn1_push_tag(req, ASN1_CONTEXT(1));
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asn1_push_tag(req, ASN1_SEQUENCE(0));
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if (princ_part1) {
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asn1_write_GeneralString(req, princ_part1);
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}
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asn1_write_GeneralString(req, princ_part2);
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asn1_pop_tag(req);
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asn1_pop_tag(req);
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asn1_pop_tag(req);
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asn1_pop_tag(req);
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asn1_push_tag(req, ASN1_CONTEXT(2));
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asn1_write_GeneralString(req, realm);
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asn1_pop_tag(req);
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asn1_pop_tag(req);
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ret = data_blob(req->data, req->length);
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asn1_free(req);
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free(princ);
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return ret;
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}
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static krb5_error_code build_kpasswd_request(uint16 pversion,
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krb5_context context,
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krb5_auth_context auth_context,
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krb5_data *ap_req,
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const char *princ,
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const char *passwd,
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bool use_tcp,
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krb5_data *packet)
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{
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krb5_error_code ret;
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krb5_data cipherpw;
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krb5_data encoded_setpw;
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krb5_replay_data replay;
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char *p, *msg_start;
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DATA_BLOB setpw;
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unsigned int msg_length;
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ret = krb5_auth_con_setflags(context,
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auth_context,KRB5_AUTH_CONTEXT_DO_SEQUENCE);
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if (ret) {
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DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
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error_message(ret)));
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return ret;
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}
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/* handle protocol differences in chpw and setpw */
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if (pversion == KRB5_KPASSWD_VERS_CHANGEPW)
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setpw = data_blob(passwd, strlen(passwd));
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else if (pversion == KRB5_KPASSWD_VERS_SETPW ||
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pversion == KRB5_KPASSWD_VERS_SETPW_ALT)
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setpw = encode_krb5_setpw(princ, passwd);
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else
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return EINVAL;
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if (setpw.data == NULL || setpw.length == 0) {
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return EINVAL;
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}
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encoded_setpw.data = (char *)setpw.data;
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encoded_setpw.length = setpw.length;
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ret = krb5_mk_priv(context, auth_context,
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&encoded_setpw, &cipherpw, &replay);
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data_blob_free(&setpw); /*from 'encode_krb5_setpw(...)' */
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if (ret) {
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DEBUG(1,("krb5_mk_priv failed (%s)\n", error_message(ret)));
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return ret;
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}
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packet->data = (char *)SMB_MALLOC(ap_req->length + cipherpw.length + (use_tcp ? 10 : 6 ));
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if (!packet->data)
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return -1;
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/* see the RFC for details */
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msg_start = p = ((char *)packet->data) + (use_tcp ? 4 : 0);
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p += 2;
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RSSVAL(p, 0, pversion);
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p += 2;
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RSSVAL(p, 0, ap_req->length);
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p += 2;
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memcpy(p, ap_req->data, ap_req->length);
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p += ap_req->length;
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memcpy(p, cipherpw.data, cipherpw.length);
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p += cipherpw.length;
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packet->length = PTR_DIFF(p,packet->data);
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msg_length = PTR_DIFF(p,msg_start);
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if (use_tcp) {
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RSIVAL(packet->data, 0, msg_length);
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}
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RSSVAL(msg_start, 0, msg_length);
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free(cipherpw.data); /* from 'krb5_mk_priv(...)' */
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return 0;
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}
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static const struct kpasswd_errors {
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int result_code;
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const char *error_string;
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} kpasswd_errors[] = {
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{KRB5_KPASSWD_MALFORMED, "Malformed request error"},
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{KRB5_KPASSWD_HARDERROR, "Server error"},
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{KRB5_KPASSWD_AUTHERROR, "Authentication error"},
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{KRB5_KPASSWD_SOFTERROR, "Password change rejected"},
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{KRB5_KPASSWD_ACCESSDENIED, "Client does not have proper authorization"},
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{KRB5_KPASSWD_BAD_VERSION, "Protocol version not supported"},
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{KRB5_KPASSWD_INITIAL_FLAG_NEEDED, "Authorization ticket must have initial flag set"},
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{KRB5_KPASSWD_POLICY_REJECT, "Password rejected due to policy requirements"},
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{KRB5_KPASSWD_BAD_PRINCIPAL, "Target principal does not exist"},
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{KRB5_KPASSWD_ETYPE_NOSUPP, "Unsupported encryption type"},
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{0, NULL}
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};
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static krb5_error_code setpw_result_code_string(krb5_context context,
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int result_code,
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const char **code_string)
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{
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unsigned int idx = 0;
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while (kpasswd_errors[idx].error_string != NULL) {
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if (kpasswd_errors[idx].result_code ==
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result_code) {
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*code_string = kpasswd_errors[idx].error_string;
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return 0;
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}
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idx++;
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}
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*code_string = "Password change failed";
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return (0);
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}
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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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static krb5_error_code parse_setpw_reply(krb5_context context,
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bool use_tcp,
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krb5_auth_context auth_context,
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krb5_data *packet)
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{
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krb5_data ap_rep;
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char *p;
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int vnum, ret, res_code;
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krb5_data cipherresult;
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krb5_data clearresult;
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krb5_ap_rep_enc_part *ap_rep_enc;
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krb5_replay_data replay;
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unsigned int msg_length = packet->length;
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if (packet->length < (use_tcp ? 8 : 4)) {
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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p = (char *)packet->data;
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/*
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** see if it is an error
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*/
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if (krb5_is_krb_error(packet)) {
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ret = handle_krberror_packet(context, packet);
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if (ret) {
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return ret;
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}
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}
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/* tcp... */
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if (use_tcp) {
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msg_length -= 4;
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if (RIVAL(p, 0) != msg_length) {
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DEBUG(1,("Bad TCP packet length (%d/%d) from kpasswd server\n",
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RIVAL(p, 0), msg_length));
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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p += 4;
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}
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if (RSVAL(p, 0) != msg_length) {
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DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n",
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RSVAL(p, 0), msg_length));
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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p += 2;
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vnum = RSVAL(p, 0); p += 2;
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/* FIXME: According to standard there is only one type of reply */
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if (vnum != KRB5_KPASSWD_VERS_SETPW &&
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vnum != KRB5_KPASSWD_VERS_SETPW_ALT &&
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vnum != KRB5_KPASSWD_VERS_CHANGEPW) {
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DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum));
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return KRB5KDC_ERR_BAD_PVNO;
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}
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ap_rep.length = RSVAL(p, 0); p += 2;
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if (p + ap_rep.length >= (char *)packet->data + packet->length) {
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DEBUG(1,("ptr beyond end of packet from kpasswd server\n"));
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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if (ap_rep.length == 0) {
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DEBUG(1,("got unencrypted setpw result?!\n"));
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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/* verify ap_rep */
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ap_rep.data = p;
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p += ap_rep.length;
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ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc);
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if (ret) {
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DEBUG(1,("failed to rd setpw reply (%s)\n", error_message(ret)));
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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krb5_free_ap_rep_enc_part(context, ap_rep_enc);
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cipherresult.data = p;
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cipherresult.length = ((char *)packet->data + packet->length) - p;
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ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult,
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&replay);
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if (ret) {
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DEBUG(1,("failed to decrypt setpw reply (%s)\n", error_message(ret)));
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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if (clearresult.length < 2) {
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free(clearresult.data);
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ret = KRB5KRB_AP_ERR_MODIFIED;
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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p = (char *)clearresult.data;
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res_code = RSVAL(p, 0);
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free(clearresult.data);
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if ((res_code < KRB5_KPASSWD_SUCCESS) ||
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(res_code > KRB5_KPASSWD_ETYPE_NOSUPP)) {
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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if (res_code == KRB5_KPASSWD_SUCCESS) {
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return 0;
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} else {
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const char *errstr;
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setpw_result_code_string(context, res_code, &errstr);
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DEBUG(1, ("Error changing password: %s (%d)\n", errstr, res_code));
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return kpasswd_err_to_krb5_err(res_code);
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}
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}
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static ADS_STATUS do_krb5_kpasswd_request(krb5_context context,
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const char *kdc_host,
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uint16 pversion,
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krb5_creds *credsp,
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const char *princ,
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const char *newpw)
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{
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krb5_auth_context auth_context = NULL;
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krb5_data ap_req, chpw_req, chpw_rep;
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int ret, sock;
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socklen_t addr_len;
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struct sockaddr_storage remote_addr, local_addr;
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struct sockaddr_storage addr;
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krb5_address local_kaddr, remote_kaddr;
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bool use_tcp = False;
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if (!interpret_string_addr(&addr, kdc_host, 0)) {
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}
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ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
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NULL, credsp, &ap_req);
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if (ret) {
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DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret)));
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return ADS_ERROR_KRB5(ret);
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}
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do {
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if (!use_tcp) {
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sock = open_udp_socket(kdc_host, DEFAULT_KPASSWD_PORT);
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if (sock == -1) {
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int rc = errno;
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SAFE_FREE(ap_req.data);
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krb5_auth_con_free(context, auth_context);
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DEBUG(1,("failed to open kpasswd socket to %s "
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"(%s)\n", kdc_host, strerror(errno)));
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return ADS_ERROR_SYSTEM(rc);
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}
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} else {
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NTSTATUS status;
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status = open_socket_out(&addr, DEFAULT_KPASSWD_PORT,
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LONG_CONNECT_TIMEOUT, &sock);
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if (!NT_STATUS_IS_OK(status)) {
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SAFE_FREE(ap_req.data);
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krb5_auth_con_free(context, auth_context);
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DEBUG(1,("failed to open kpasswd socket to %s "
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"(%s)\n", kdc_host,
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nt_errstr(status)));
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return ADS_ERROR_NT(status);
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}
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}
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addr_len = sizeof(remote_addr);
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if (getpeername(sock, (struct sockaddr *)&remote_addr, &addr_len) != 0) {
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close(sock);
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SAFE_FREE(ap_req.data);
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krb5_auth_con_free(context, auth_context);
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DEBUG(1,("getpeername() failed (%s)\n", error_message(errno)));
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return ADS_ERROR_SYSTEM(errno);
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}
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addr_len = sizeof(local_addr);
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if (getsockname(sock, (struct sockaddr *)&local_addr, &addr_len) != 0) {
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close(sock);
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SAFE_FREE(ap_req.data);
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krb5_auth_con_free(context, auth_context);
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DEBUG(1,("getsockname() failed (%s)\n", error_message(errno)));
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return ADS_ERROR_SYSTEM(errno);
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}
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if (!setup_kaddr(&remote_kaddr, &remote_addr) ||
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!setup_kaddr(&local_kaddr, &local_addr)) {
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DEBUG(1,("do_krb5_kpasswd_request: "
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"Failed to setup addresses.\n"));
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close(sock);
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SAFE_FREE(ap_req.data);
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krb5_auth_con_free(context, auth_context);
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errno = EINVAL;
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return ADS_ERROR_SYSTEM(EINVAL);
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}
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ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL);
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if (ret) {
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close(sock);
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SAFE_FREE(ap_req.data);
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krb5_auth_con_free(context, auth_context);
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DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret)));
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return ADS_ERROR_KRB5(ret);
|
|
}
|
|
|
|
ret = build_kpasswd_request(pversion, context, auth_context, &ap_req,
|
|
princ, newpw, use_tcp, &chpw_req);
|
|
if (ret) {
|
|
close(sock);
|
|
SAFE_FREE(ap_req.data);
|
|
krb5_auth_con_free(context, auth_context);
|
|
DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret)));
|
|
return ADS_ERROR_KRB5(ret);
|
|
}
|
|
|
|
ret = write(sock, chpw_req.data, chpw_req.length);
|
|
|
|
if (ret != chpw_req.length) {
|
|
close(sock);
|
|
SAFE_FREE(chpw_req.data);
|
|
SAFE_FREE(ap_req.data);
|
|
krb5_auth_con_free(context, auth_context);
|
|
DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
|
|
return ADS_ERROR_SYSTEM(errno);
|
|
}
|
|
|
|
SAFE_FREE(chpw_req.data);
|
|
|
|
chpw_rep.length = 1500;
|
|
chpw_rep.data = (char *) SMB_MALLOC(chpw_rep.length);
|
|
if (!chpw_rep.data) {
|
|
close(sock);
|
|
SAFE_FREE(ap_req.data);
|
|
krb5_auth_con_free(context, auth_context);
|
|
DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
|
|
errno = ENOMEM;
|
|
return ADS_ERROR_SYSTEM(errno);
|
|
}
|
|
|
|
ret = read(sock, chpw_rep.data, chpw_rep.length);
|
|
if (ret < 0) {
|
|
close(sock);
|
|
SAFE_FREE(chpw_rep.data);
|
|
SAFE_FREE(ap_req.data);
|
|
krb5_auth_con_free(context, auth_context);
|
|
DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno)));
|
|
return ADS_ERROR_SYSTEM(errno);
|
|
}
|
|
|
|
close(sock);
|
|
chpw_rep.length = ret;
|
|
|
|
ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr);
|
|
if (ret) {
|
|
SAFE_FREE(chpw_rep.data);
|
|
SAFE_FREE(ap_req.data);
|
|
krb5_auth_con_free(context, auth_context);
|
|
DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n",
|
|
error_message(ret)));
|
|
return ADS_ERROR_KRB5(ret);
|
|
}
|
|
|
|
ret = parse_setpw_reply(context, use_tcp, auth_context, &chpw_rep);
|
|
SAFE_FREE(chpw_rep.data);
|
|
|
|
if (ret) {
|
|
|
|
if (ret == KRB5KRB_ERR_RESPONSE_TOO_BIG && !use_tcp) {
|
|
DEBUG(5, ("Trying setpw with TCP!!!\n"));
|
|
use_tcp = True;
|
|
continue;
|
|
}
|
|
|
|
SAFE_FREE(ap_req.data);
|
|
krb5_auth_con_free(context, auth_context);
|
|
DEBUG(1,("parse_setpw_reply failed (%s)\n",
|
|
error_message(ret)));
|
|
return ADS_ERROR_KRB5(ret);
|
|
}
|
|
|
|
SAFE_FREE(ap_req.data);
|
|
krb5_auth_con_free(context, auth_context);
|
|
} while ( ret );
|
|
|
|
return ADS_SUCCESS;
|
|
}
|
|
|
|
ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *princ,
|
|
const char *newpw, int time_offset)
|
|
{
|
|
|
|
ADS_STATUS aret;
|
|
krb5_error_code ret = 0;
|
|
krb5_context context = NULL;
|
|
krb5_principal principal = NULL;
|
|
char *princ_name = NULL;
|
|
char *realm = NULL;
|
|
krb5_creds creds, *credsp = NULL;
|
|
#if KRB5_PRINC_REALM_RETURNS_REALM
|
|
krb5_realm orig_realm;
|
|
#else
|
|
krb5_data orig_realm;
|
|
#endif
|
|
krb5_ccache ccache = NULL;
|
|
|
|
ZERO_STRUCT(creds);
|
|
|
|
initialize_krb5_error_table();
|
|
ret = krb5_init_context(&context);
|
|
if (ret) {
|
|
DEBUG(1,("Failed to init krb5 context (%s)\n", 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_context(context);
|
|
DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
|
|
return ADS_ERROR_KRB5(ret);
|
|
}
|
|
|
|
realm = strchr_m(princ, '@');
|
|
if (!realm) {
|
|
krb5_cc_close(context, ccache);
|
|
krb5_free_context(context);
|
|
DEBUG(1,("Failed to get realm\n"));
|
|
return ADS_ERROR_KRB5(-1);
|
|
}
|
|
realm++;
|
|
|
|
if (asprintf(&princ_name, "kadmin/changepw@%s", realm) == -1) {
|
|
krb5_cc_close(context, ccache);
|
|
krb5_free_context(context);
|
|
DEBUG(1,("asprintf failed\n"));
|
|
return ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
|
|
}
|
|
|
|
ret = smb_krb5_parse_name(context, princ_name, &creds.server);
|
|
if (ret) {
|
|
krb5_cc_close(context, ccache);
|
|
krb5_free_context(context);
|
|
DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
|
|
return ADS_ERROR_KRB5(ret);
|
|
}
|
|
|
|
/* parse the principal we got as a function argument */
|
|
ret = smb_krb5_parse_name(context, princ, &principal);
|
|
if (ret) {
|
|
krb5_cc_close(context, ccache);
|
|
krb5_free_principal(context, creds.server);
|
|
krb5_free_context(context);
|
|
DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret)));
|
|
free(princ_name);
|
|
return ADS_ERROR_KRB5(ret);
|
|
}
|
|
|
|
free(princ_name);
|
|
|
|
/* The creds.server principal takes ownership of this memory.
|
|
Remember to set back to original value before freeing. */
|
|
orig_realm = *krb5_princ_realm(context, creds.server);
|
|
krb5_princ_set_realm(context, creds.server, krb5_princ_realm(context, principal));
|
|
|
|
ret = krb5_cc_get_principal(context, ccache, &creds.client);
|
|
if (ret) {
|
|
krb5_cc_close(context, ccache);
|
|
krb5_princ_set_realm(context, creds.server, &orig_realm);
|
|
krb5_free_principal(context, creds.server);
|
|
krb5_free_principal(context, principal);
|
|
krb5_free_context(context);
|
|
DEBUG(1,("Failed to get principal from ccache (%s)\n",
|
|
error_message(ret)));
|
|
return ADS_ERROR_KRB5(ret);
|
|
}
|
|
|
|
ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
|
|
if (ret) {
|
|
krb5_cc_close(context, ccache);
|
|
krb5_free_principal(context, creds.client);
|
|
krb5_princ_set_realm(context, creds.server, &orig_realm);
|
|
krb5_free_principal(context, creds.server);
|
|
krb5_free_principal(context, principal);
|
|
krb5_free_context(context);
|
|
DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
|
|
return ADS_ERROR_KRB5(ret);
|
|
}
|
|
|
|
/* we might have to call krb5_free_creds(...) from now on ... */
|
|
|
|
aret = do_krb5_kpasswd_request(context, kdc_host,
|
|
KRB5_KPASSWD_VERS_SETPW,
|
|
credsp, princ, newpw);
|
|
|
|
krb5_free_creds(context, credsp);
|
|
krb5_free_principal(context, creds.client);
|
|
krb5_princ_set_realm(context, creds.server, &orig_realm);
|
|
krb5_free_principal(context, creds.server);
|
|
krb5_free_principal(context, principal);
|
|
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;
|
|
krb5_creds creds;
|
|
char *chpw_princ = NULL, *password;
|
|
|
|
initialize_krb5_error_table();
|
|
ret = krb5_init_context(&context);
|
|
if (ret) {
|
|
DEBUG(1,("Failed to init krb5 context (%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);
|
|
}
|
|
|
|
krb5_get_init_creds_opt_init(&opts);
|
|
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);
|
|
|
|
/* We have to obtain an INITIAL changepw ticket for changing password */
|
|
if (asprintf(&chpw_princ, "kadmin/changepw@%s",
|
|
(char *) krb5_princ_realm(context, princ)) == -1) {
|
|
krb5_free_context(context);
|
|
DEBUG(1,("ads_krb5_chg_password: asprintf fail\n"));
|
|
return ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
|
|
}
|
|
|
|
password = SMB_STRDUP(oldpw);
|
|
ret = krb5_get_init_creds_password(context, &creds, princ, password,
|
|
kerb_prompter, NULL,
|
|
0, chpw_princ, &opts);
|
|
SAFE_FREE(chpw_princ);
|
|
SAFE_FREE(password);
|
|
|
|
if (ret) {
|
|
if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
|
|
DEBUG(1,("Password incorrect while getting initial ticket"));
|
|
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);
|
|
}
|
|
|
|
aret = do_krb5_kpasswd_request(context, kdc_host,
|
|
KRB5_KPASSWD_VERS_CHANGEPW,
|
|
&creds, principal, newpw);
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
/**
|
|
* Set the machine account password
|
|
* @param ads connection to ads server
|
|
* @param hostname machine whose password is being set
|
|
* @param password new password
|
|
* @return status of password change
|
|
**/
|
|
ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads,
|
|
const char *machine_account,
|
|
const char *password)
|
|
{
|
|
ADS_STATUS status;
|
|
char *principal = NULL;
|
|
|
|
/*
|
|
we need to use the '$' form of the name here (the machine account name),
|
|
as otherwise the server might end up setting the password for a user
|
|
instead
|
|
*/
|
|
if (asprintf(&principal, "%s@%s", machine_account, ads->config.realm) < 0) {
|
|
return ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
|
|
}
|
|
|
|
status = ads_krb5_set_password(ads->auth.kdc_server, principal,
|
|
password, ads->auth.time_offset);
|
|
|
|
SAFE_FREE(principal);
|
|
return status;
|
|
}
|
|
#endif
|