610 lines
15 KiB
C
610 lines
15 KiB
C
/*
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* Copyright (c) 1997-2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kpasswd_locl.h"
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RCSID("$Id: kpasswdd.c,v 1.52 2001/07/02 16:27:09 assar Exp $");
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#include <kadm5/admin.h>
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#include <hdb.h>
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static krb5_context context;
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static krb5_log_facility *log_facility;
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static sig_atomic_t exit_flag = 0;
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static void
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send_reply (int s,
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struct sockaddr *sa,
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int sa_size,
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krb5_data *ap_rep,
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krb5_data *rest)
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{
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struct msghdr msghdr;
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struct iovec iov[3];
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u_int16_t len, ap_rep_len;
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u_char header[6];
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u_char *p;
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if (ap_rep)
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ap_rep_len = ap_rep->length;
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else
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ap_rep_len = 0;
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len = 6 + ap_rep_len + rest->length;
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p = header;
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*p++ = (len >> 8) & 0xFF;
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*p++ = (len >> 0) & 0xFF;
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*p++ = 0;
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*p++ = 1;
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*p++ = (ap_rep_len >> 8) & 0xFF;
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*p++ = (ap_rep_len >> 0) & 0xFF;
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memset (&msghdr, 0, sizeof(msghdr));
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msghdr.msg_name = (void *)sa;
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msghdr.msg_namelen = sa_size;
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msghdr.msg_iov = iov;
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msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov);
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#if 0
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msghdr.msg_control = NULL;
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msghdr.msg_controllen = 0;
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#endif
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iov[0].iov_base = (char *)header;
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iov[0].iov_len = 6;
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if (ap_rep_len) {
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iov[1].iov_base = ap_rep->data;
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iov[1].iov_len = ap_rep->length;
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} else {
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iov[1].iov_base = NULL;
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iov[1].iov_len = 0;
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}
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iov[2].iov_base = rest->data;
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iov[2].iov_len = rest->length;
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if (sendmsg (s, &msghdr, 0) < 0)
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krb5_warn (context, errno, "sendmsg");
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}
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static int
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make_result (krb5_data *data,
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u_int16_t result_code,
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const char *expl)
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{
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krb5_data_zero (data);
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data->length = asprintf ((char **)&data->data,
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"%c%c%s",
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(result_code >> 8) & 0xFF,
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result_code & 0xFF,
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expl);
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if (data->data == NULL) {
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krb5_warnx (context, "Out of memory generating error reply");
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return 1;
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}
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return 0;
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}
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static void
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reply_error (krb5_principal server,
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int s,
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struct sockaddr *sa,
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int sa_size,
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krb5_error_code error_code,
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u_int16_t result_code,
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const char *expl)
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{
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krb5_error_code ret;
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krb5_data error_data;
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krb5_data e_data;
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if (make_result(&e_data, result_code, expl))
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return;
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ret = krb5_mk_error (context,
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error_code,
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NULL,
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&e_data,
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NULL,
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server,
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NULL,
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NULL,
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&error_data);
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krb5_data_free (&e_data);
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if (ret) {
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krb5_warn (context, ret, "Could not even generate error reply");
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return;
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}
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send_reply (s, sa, sa_size, NULL, &error_data);
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krb5_data_free (&error_data);
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}
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static void
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reply_priv (krb5_auth_context auth_context,
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int s,
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struct sockaddr *sa,
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int sa_size,
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u_int16_t result_code,
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const char *expl)
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{
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krb5_error_code ret;
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krb5_data krb_priv_data;
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krb5_data ap_rep_data;
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krb5_data e_data;
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ret = krb5_mk_rep (context,
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auth_context,
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&ap_rep_data);
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if (ret) {
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krb5_warn (context, ret, "Could not even generate error reply");
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return;
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}
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if (make_result(&e_data, result_code, expl))
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return;
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ret = krb5_mk_priv (context,
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auth_context,
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&e_data,
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&krb_priv_data,
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NULL);
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krb5_data_free (&e_data);
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if (ret) {
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krb5_warn (context, ret, "Could not even generate error reply");
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return;
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}
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send_reply (s, sa, sa_size, &ap_rep_data, &krb_priv_data);
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krb5_data_free (&ap_rep_data);
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krb5_data_free (&krb_priv_data);
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}
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/*
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* Change the password for `principal', sending the reply back on `s'
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* (`sa', `sa_size') to `pwd_data'.
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*/
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static void
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change (krb5_auth_context auth_context,
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krb5_principal principal,
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int s,
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struct sockaddr *sa,
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int sa_size,
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krb5_data *pwd_data)
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{
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krb5_error_code ret;
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char *client;
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const char *pwd_reason;
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kadm5_config_params conf;
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void *kadm5_handle;
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char *tmp;
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memset (&conf, 0, sizeof(conf));
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krb5_unparse_name (context, principal, &client);
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ret = kadm5_init_with_password_ctx(context,
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client,
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NULL,
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KADM5_ADMIN_SERVICE,
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&conf, 0, 0,
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&kadm5_handle);
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if (ret) {
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free (client);
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krb5_warn (context, ret, "kadm5_init_with_password_ctx");
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reply_priv (auth_context, s, sa, sa_size, 2,
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"Internal error");
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return;
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}
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krb5_warnx (context, "Changing password for %s", client);
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free (client);
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pwd_reason = kadm5_check_password_quality (context, principal, pwd_data);
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if (pwd_reason != NULL ) {
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krb5_warnx (context, "%s", pwd_reason);
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reply_priv (auth_context, s, sa, sa_size, 4, pwd_reason);
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kadm5_destroy (kadm5_handle);
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return;
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}
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tmp = malloc (pwd_data->length + 1);
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if (tmp == NULL) {
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krb5_warnx (context, "malloc: out of memory");
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reply_priv (auth_context, s, sa, sa_size, 2,
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"Internal error");
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goto out;
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}
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memcpy (tmp, pwd_data->data, pwd_data->length);
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tmp[pwd_data->length] = '\0';
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ret = kadm5_s_chpass_principal_cond (kadm5_handle, principal, tmp);
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memset (tmp, 0, pwd_data->length);
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free (tmp);
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if (ret) {
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krb5_warn (context, ret, "kadm5_s_chpass_principal_cond");
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reply_priv (auth_context, s, sa, sa_size, 2,
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"Internal error");
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goto out;
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}
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reply_priv (auth_context, s, sa, sa_size, 0, "Password changed");
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out:
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kadm5_destroy (kadm5_handle);
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}
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static int
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verify (krb5_auth_context *auth_context,
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krb5_principal server,
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krb5_keytab keytab,
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krb5_ticket **ticket,
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krb5_data *out_data,
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int s,
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struct sockaddr *sa,
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int sa_size,
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u_char *msg,
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size_t len)
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{
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krb5_error_code ret;
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u_int16_t pkt_len, pkt_ver, ap_req_len;
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krb5_data ap_req_data;
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krb5_data krb_priv_data;
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pkt_len = (msg[0] << 8) | (msg[1]);
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pkt_ver = (msg[2] << 8) | (msg[3]);
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ap_req_len = (msg[4] << 8) | (msg[5]);
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if (pkt_len != len) {
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krb5_warnx (context, "Strange len: %ld != %ld",
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(long)pkt_len, (long)len);
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reply_error (server, s, sa, sa_size, 0, 1, "Bad request");
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return 1;
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}
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if (pkt_ver != 0x0001) {
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krb5_warnx (context, "Bad version (%d)", pkt_ver);
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reply_error (server, s, sa, sa_size, 0, 1, "Wrong program version");
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return 1;
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}
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ap_req_data.data = msg + 6;
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ap_req_data.length = ap_req_len;
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ret = krb5_rd_req (context,
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auth_context,
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&ap_req_data,
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server,
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keytab,
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NULL,
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ticket);
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if (ret) {
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if(ret == KRB5_KT_NOTFOUND) {
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char *name;
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krb5_unparse_name(context, server, &name);
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krb5_warnx (context, "krb5_rd_req: %s (%s)",
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krb5_get_err_text(context, ret), name);
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free(name);
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} else
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krb5_warn (context, ret, "krb5_rd_req");
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reply_error (server, s, sa, sa_size, ret, 3, "Authentication failed");
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return 1;
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}
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if (!(*ticket)->ticket.flags.initial) {
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krb5_warnx (context, "initial flag not set");
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reply_error (server, s, sa, sa_size, ret, 1,
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"Bad request");
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goto out;
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}
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krb_priv_data.data = msg + 6 + ap_req_len;
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krb_priv_data.length = len - 6 - ap_req_len;
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ret = krb5_rd_priv (context,
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*auth_context,
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&krb_priv_data,
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out_data,
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NULL);
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if (ret) {
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krb5_warn (context, ret, "krb5_rd_priv");
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reply_error (server, s, sa, sa_size, ret, 3, "Bad request");
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goto out;
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}
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return 0;
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out:
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krb5_free_ticket (context, *ticket);
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return 1;
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}
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static void
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process (krb5_principal server,
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krb5_keytab keytab,
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int s,
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krb5_address *this_addr,
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struct sockaddr *sa,
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int sa_size,
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u_char *msg,
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int len)
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{
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krb5_error_code ret;
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krb5_auth_context auth_context = NULL;
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krb5_data out_data;
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krb5_ticket *ticket;
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krb5_address other_addr;
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krb5_data_zero (&out_data);
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ret = krb5_auth_con_init (context, &auth_context);
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if (ret) {
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krb5_warn (context, ret, "krb5_auth_con_init");
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return;
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}
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krb5_auth_con_setflags (context, auth_context,
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KRB5_AUTH_CONTEXT_DO_SEQUENCE);
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ret = krb5_sockaddr2address (context, sa, &other_addr);
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if (ret) {
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krb5_warn (context, ret, "krb5_sockaddr2address");
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goto out;
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}
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ret = krb5_auth_con_setaddrs (context,
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auth_context,
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this_addr,
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&other_addr);
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krb5_free_address (context, &other_addr);
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if (ret) {
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krb5_warn (context, ret, "krb5_auth_con_setaddr");
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goto out;
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}
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if (verify (&auth_context, server, keytab, &ticket, &out_data,
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s, sa, sa_size, msg, len) == 0) {
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change (auth_context,
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ticket->client,
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s,
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sa, sa_size,
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&out_data);
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memset (out_data.data, 0, out_data.length);
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krb5_free_ticket (context, ticket);
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free (ticket);
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}
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out:
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krb5_data_free (&out_data);
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krb5_auth_con_free (context, auth_context);
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}
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static int
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doit (krb5_keytab keytab, int port)
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{
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krb5_error_code ret;
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krb5_principal server;
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int *sockets;
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int maxfd;
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char *realm;
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krb5_addresses addrs;
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unsigned n, i;
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fd_set real_fdset;
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struct sockaddr_storage __ss;
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struct sockaddr *sa = (struct sockaddr *)&__ss;
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ret = krb5_get_default_realm (context, &realm);
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if (ret)
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krb5_err (context, 1, ret, "krb5_get_default_realm");
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ret = krb5_build_principal (context,
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&server,
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strlen(realm),
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realm,
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"kadmin",
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"changepw",
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NULL);
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if (ret)
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krb5_err (context, 1, ret, "krb5_build_principal");
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free (realm);
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ret = krb5_get_all_server_addrs (context, &addrs);
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if (ret)
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krb5_err (context, 1, ret, "krb5_get_all_server_addrs");
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n = addrs.len;
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sockets = malloc (n * sizeof(*sockets));
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if (sockets == NULL)
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krb5_errx (context, 1, "out of memory");
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maxfd = -1;
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FD_ZERO(&real_fdset);
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for (i = 0; i < n; ++i) {
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int sa_size;
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krb5_addr2sockaddr (context, &addrs.val[i], sa, &sa_size, port);
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sockets[i] = socket (sa->sa_family, SOCK_DGRAM, 0);
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if (sockets[i] < 0)
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krb5_err (context, 1, errno, "socket");
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if (bind (sockets[i], sa, sa_size) < 0) {
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char str[128];
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size_t len;
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int save_errno = errno;
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ret = krb5_print_address (&addrs.val[i], str, sizeof(str), &len);
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if (ret)
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strlcpy(str, "unknown address", sizeof(str));
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krb5_warn (context, save_errno, "bind(%s)", str);
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continue;
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}
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maxfd = max (maxfd, sockets[i]);
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if (maxfd >= FD_SETSIZE)
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krb5_errx (context, 1, "fd too large");
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FD_SET(sockets[i], &real_fdset);
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}
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if (maxfd == -1)
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krb5_errx (context, 1, "No sockets!");
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while(exit_flag == 0) {
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int ret;
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fd_set fdset = real_fdset;
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ret = select (maxfd + 1, &fdset, NULL, NULL, NULL);
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if (ret < 0) {
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if (errno == EINTR)
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continue;
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else
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krb5_err (context, 1, errno, "select");
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}
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for (i = 0; i < n; ++i)
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if (FD_ISSET(sockets[i], &fdset)) {
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u_char buf[BUFSIZ];
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socklen_t addrlen = sizeof(__ss);
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ret = recvfrom (sockets[i], buf, sizeof(buf), 0,
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sa, &addrlen);
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if (ret < 0) {
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if(errno == EINTR)
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break;
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else
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krb5_err (context, 1, errno, "recvfrom");
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}
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process (server, keytab, sockets[i],
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&addrs.val[i],
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sa, addrlen,
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buf, ret);
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}
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}
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krb5_free_addresses (context, &addrs);
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krb5_free_principal (context, server);
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krb5_free_context (context);
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return 0;
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}
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static RETSIGTYPE
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sigterm(int sig)
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{
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exit_flag = 1;
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}
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const char *check_library = NULL;
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const char *check_function = NULL;
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char *keytab_str = "HDB:";
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char *realm_str;
|
|
int version_flag;
|
|
int help_flag;
|
|
char *port_str;
|
|
|
|
struct getargs args[] = {
|
|
#ifdef HAVE_DLOPEN
|
|
{ "check-library", 0, arg_string, &check_library,
|
|
"library to load password check function from", "library" },
|
|
{ "check-function", 0, arg_string, &check_function,
|
|
"password check function to load", "function" },
|
|
#endif
|
|
{ "keytab", 'k', arg_string, &keytab_str,
|
|
"keytab to get authentication key from", "kspec" },
|
|
{ "realm", 'r', arg_string, &realm_str, "default realm", "realm" },
|
|
{ "port", 'p', arg_string, &port_str, "port" },
|
|
{ "version", 0, arg_flag, &version_flag },
|
|
{ "help", 0, arg_flag, &help_flag }
|
|
};
|
|
int num_args = sizeof(args) / sizeof(args[0]);
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
int optind;
|
|
krb5_keytab keytab;
|
|
krb5_error_code ret;
|
|
int port;
|
|
|
|
optind = krb5_program_setup(&context, argc, argv, args, num_args, NULL);
|
|
|
|
if(help_flag)
|
|
krb5_std_usage(0, args, num_args);
|
|
if(version_flag) {
|
|
print_version(NULL);
|
|
exit(0);
|
|
}
|
|
|
|
if(realm_str)
|
|
krb5_set_default_realm(context, realm_str);
|
|
|
|
krb5_openlog (context, "kpasswdd", &log_facility);
|
|
krb5_set_warn_dest(context, log_facility);
|
|
|
|
if (port_str != NULL) {
|
|
struct servent *s = roken_getservbyname (port_str, "udp");
|
|
|
|
if (s != NULL)
|
|
port = s->s_port;
|
|
else {
|
|
char *ptr;
|
|
|
|
port = strtol (port_str, &ptr, 10);
|
|
if (port == 0 && ptr == port_str)
|
|
krb5_errx (context, 1, "bad port `%s'", port_str);
|
|
port = htons(port);
|
|
}
|
|
} else
|
|
port = krb5_getportbyname (context, "kpasswd", "udp", KPASSWD_PORT);
|
|
|
|
ret = krb5_kt_register(context, &hdb_kt_ops);
|
|
if(ret)
|
|
krb5_err(context, 1, ret, "krb5_kt_register");
|
|
|
|
ret = krb5_kt_resolve(context, keytab_str, &keytab);
|
|
if(ret)
|
|
krb5_err(context, 1, ret, "%s", keytab_str);
|
|
|
|
kadm5_setup_passwd_quality_check (context, check_library, check_function);
|
|
|
|
#ifdef HAVE_SIGACTION
|
|
{
|
|
struct sigaction sa;
|
|
|
|
sa.sa_flags = 0;
|
|
sa.sa_handler = sigterm;
|
|
sigemptyset(&sa.sa_mask);
|
|
|
|
sigaction(SIGINT, &sa, NULL);
|
|
sigaction(SIGTERM, &sa, NULL);
|
|
}
|
|
#else
|
|
signal(SIGINT, sigterm);
|
|
signal(SIGTERM, sigterm);
|
|
#endif
|
|
|
|
pidfile(NULL);
|
|
|
|
return doit (keytab, port);
|
|
}
|