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b5666e2874
// -> /* */
(This used to be commit a308abbab7
)
470 lines
13 KiB
C
470 lines
13 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 3.0
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.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_ACCESSDENIED 5
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#define KRB5_KPASSWD_BAD_VERSION 6
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/* This implements the Kerb password change protocol as specifed in
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* kerb-chg-password-02.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 = strdup(principal);
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if ((c = strchr(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(c, '@')) != NULL) {
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*c = '\0';
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c++;
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realm = c;
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}
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memset(&req, 0, sizeof(req));
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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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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_setpw_request(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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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;
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DATA_BLOB setpw;
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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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setpw = encode_krb5_setpw(princ, passwd);
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encoded_setpw.data = 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 *)malloc(ap_req->length + cipherpw.length + 6);
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/* see the RFC for details */
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p = packet->data + 2;
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RSSVAL(p, 0, 0xff80); p += 2;
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RSSVAL(p, 0, ap_req->length); p += 2;
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memcpy(p, ap_req->data, ap_req->length); p += ap_req->length;
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memcpy(p, cipherpw.data, cipherpw.length); p += cipherpw.length;
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packet->length = PTR_DIFF(p,packet->data);
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RSSVAL(packet->data, 0, packet->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 krb5_error_code parse_setpw_reply(krb5_context context,
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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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if (packet->length < 4) {
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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p = packet->data;
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if (packet->data[0] == 0x7e || packet->data[0] == 0x5e) {
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/* it's an error packet. We should parse it ... */
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DEBUG(1,("Got error packet 0x%x from kpasswd server\n",
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packet->data[0]));
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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if (RSVAL(p, 0) != packet->length) {
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DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n",
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RSVAL(p, 0), packet->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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if (vnum != KRB5_KPASSWD_VERS_SETPW && 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 >= 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 = (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 = 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_ACCESSDENIED)) {
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return KRB5KRB_AP_ERR_MODIFIED;
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}
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return 0;
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}
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ADS_STATUS krb5_set_password(const char *kdc_host, const char *princ, const char *newpw)
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{
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krb5_context context;
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krb5_auth_context auth_context = NULL;
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krb5_principal principal;
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char *princ_name;
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char *realm;
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krb5_creds creds, *credsp;
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krb5_ccache ccache;
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krb5_data ap_req, chpw_req, chpw_rep;
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int ret, sock, addr_len;
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struct sockaddr remote_addr, local_addr;
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krb5_address local_kaddr, remote_kaddr;
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ret = krb5_init_context(&context);
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if (ret) {
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DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
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return ADS_ERROR_KRB5(ret);
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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_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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ZERO_STRUCT(creds);
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realm = strchr(princ, '@');
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realm++;
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asprintf(&princ_name, "kadmin/changepw@%s", realm);
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ret = krb5_parse_name(context, princ_name, &creds.server);
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if (ret) {
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krb5_free_context(context);
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DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
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return ADS_ERROR_KRB5(ret);
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}
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free(princ_name);
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/* parse the principal we got as a function argument */
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ret = krb5_parse_name(context, princ, &principal);
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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", princ_name, error_message(ret)));
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return ADS_ERROR_KRB5(ret);
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}
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krb5_princ_set_realm(context, creds.server,
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krb5_princ_realm(context, principal));
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ret = krb5_cc_get_principal(context, ccache, &creds.client);
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if (ret) {
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krb5_free_principal(context, principal);
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krb5_free_context(context);
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DEBUG(1,("Failed to get principal from ccache (%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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ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
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if (ret) {
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krb5_free_principal(context, creds.client);
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krb5_free_principal(context, principal);
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krb5_free_context(context);
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DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
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return ADS_ERROR_KRB5(ret);
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}
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/* we might have to call krb5_free_creds(...) from now on ... */
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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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krb5_free_creds(context, credsp);
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krb5_free_principal(context, creds.client);
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krb5_free_principal(context, principal);
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krb5_free_context(context);
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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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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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free(ap_req.data);
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krb5_free_creds(context, credsp);
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krb5_free_principal(context, creds.client);
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krb5_free_principal(context, principal);
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krb5_free_context(context);
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DEBUG(1,("failed to open kpasswd socket to %s (%s)\n",
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kdc_host, strerror(errno)));
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return ADS_ERROR_SYSTEM(rc);
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}
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addr_len = sizeof(remote_addr);
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getpeername(sock, &remote_addr, &addr_len);
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addr_len = sizeof(local_addr);
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getsockname(sock, &local_addr, &addr_len);
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remote_kaddr.addrtype = ADDRTYPE_INET;
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remote_kaddr.length = sizeof(((struct sockaddr_in *)&remote_addr)->sin_addr);
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remote_kaddr.contents = (char *)&(((struct sockaddr_in *)&remote_addr)->sin_addr);
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local_kaddr.addrtype = ADDRTYPE_INET;
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local_kaddr.length = sizeof(((struct sockaddr_in *)&local_addr)->sin_addr);
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local_kaddr.contents = (char *)&(((struct sockaddr_in *)&local_addr)->sin_addr);
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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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free(ap_req.data);
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krb5_free_creds(context, credsp);
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krb5_free_principal(context, creds.client);
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krb5_free_principal(context, principal);
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krb5_free_context(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);
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}
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ret = build_setpw_request(context, auth_context, &ap_req,
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princ, newpw, &chpw_req);
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if (ret) {
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close(sock);
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free(ap_req.data);
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krb5_free_creds(context, credsp);
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krb5_free_principal(context, creds.client);
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krb5_free_principal(context, principal);
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krb5_free_context(context);
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DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret)));
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return ADS_ERROR_KRB5(ret);
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}
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if (write(sock, chpw_req.data, chpw_req.length) != chpw_req.length) {
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close(sock);
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free(chpw_req.data);
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free(ap_req.data);
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krb5_free_creds(context, credsp);
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krb5_free_principal(context, creds.client);
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krb5_free_principal(context, principal);
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krb5_free_context(context);
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DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
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return ADS_ERROR_SYSTEM(errno);
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}
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free(chpw_req.data);
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chpw_rep.length = 1500;
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chpw_rep.data = (char *) malloc(chpw_rep.length);
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ret = read(sock, chpw_rep.data, chpw_rep.length);
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if (ret < 0) {
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close(sock);
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free(chpw_rep.data);
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free(ap_req.data);
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krb5_free_creds(context, credsp);
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krb5_free_principal(context, creds.client);
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krb5_free_principal(context, principal);
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krb5_free_context(context);
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DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno)));
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return ADS_ERROR_SYSTEM(errno);
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}
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close(sock);
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chpw_rep.length = ret;
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ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr);
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if (ret) {
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free(chpw_rep.data);
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free(ap_req.data);
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krb5_free_creds(context, credsp);
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krb5_free_principal(context, creds.client);
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krb5_free_principal(context, principal);
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krb5_free_context(context);
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DEBUG(1,("krb5_auth_con_setaddrs on reply 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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ret = parse_setpw_reply(context, auth_context, &chpw_rep);
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free(chpw_rep.data);
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if (ret) {
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free(ap_req.data);
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krb5_free_creds(context, credsp);
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krb5_free_principal(context, creds.client);
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krb5_free_principal(context, principal);
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krb5_free_context(context);
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DEBUG(1,("parse_setpw_reply 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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free(ap_req.data);
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krb5_free_creds(context, credsp);
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krb5_free_principal(context, creds.client);
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krb5_free_principal(context, principal);
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krb5_free_context(context);
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return ADS_SUCCESS;
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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, const char *auth_password,
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const char *target_principal, const char *new_password)
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{
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int ret;
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if ((ret = kerberos_kinit_password(auth_principal, auth_password))) {
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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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return krb5_set_password(kpasswd_server, target_principal, new_password);
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}
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#endif
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