390 lines
9.4 KiB
C
390 lines
9.4 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 <krb5_locl.h>
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RCSID("$Id: changepw.c,v 1.32 2001/05/14 22:49:55 assar Exp $");
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static krb5_error_code
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get_kdc_address (krb5_context context,
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krb5_realm realm,
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struct addrinfo **ai,
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char **ret_host)
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{
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krb5_error_code ret;
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char **hostlist;
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int port = 0;
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int error;
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char *host;
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int save_errno;
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ret = krb5_get_krb_changepw_hst (context,
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&realm,
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&hostlist);
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if (ret)
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return ret;
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host = strdup(*hostlist);
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krb5_free_krbhst(context, hostlist);
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if (host == NULL) {
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krb5_set_error_string (context, "malloc: out of memory");
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return ENOMEM;
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}
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port = ntohs(krb5_getportbyname (context, "kpasswd", "udp", KPASSWD_PORT));
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error = roken_getaddrinfo_hostspec2(host, SOCK_DGRAM, port, ai);
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if(error) {
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save_errno = errno;
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krb5_set_error_string(context, "resolving %s: %s",
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host, gai_strerror(error));
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return krb5_eai_to_heim_errno(error, save_errno);
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}
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*ret_host = host;
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return 0;
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}
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static krb5_error_code
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send_request (krb5_context context,
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krb5_auth_context *auth_context,
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krb5_creds *creds,
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int sock,
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struct sockaddr *sa,
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int sa_size,
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char *passwd,
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const char *host)
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{
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krb5_error_code ret;
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krb5_data ap_req_data;
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krb5_data krb_priv_data;
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krb5_data passwd_data;
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size_t len;
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u_char header[6];
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u_char *p;
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struct iovec iov[3];
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struct msghdr msghdr;
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krb5_data_zero (&ap_req_data);
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ret = krb5_mk_req_extended (context,
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auth_context,
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AP_OPTS_MUTUAL_REQUIRED,
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NULL, /* in_data */
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creds,
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&ap_req_data);
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if (ret)
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return ret;
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passwd_data.data = passwd;
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passwd_data.length = strlen(passwd);
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krb5_data_zero (&krb_priv_data);
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ret = krb5_mk_priv (context,
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*auth_context,
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&passwd_data,
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&krb_priv_data,
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NULL);
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if (ret)
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goto out2;
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len = 6 + ap_req_data.length + krb_priv_data.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_req_data.length >> 8) & 0xFF;
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*p++ = (ap_req_data.length >> 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 = (void*)header;
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iov[0].iov_len = 6;
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iov[1].iov_base = ap_req_data.data;
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iov[1].iov_len = ap_req_data.length;
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iov[2].iov_base = krb_priv_data.data;
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iov[2].iov_len = krb_priv_data.length;
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if (sendmsg (sock, &msghdr, 0) < 0) {
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ret = errno;
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krb5_set_error_string(context, "sendmsg %s: %s", host, strerror(ret));
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}
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krb5_data_free (&krb_priv_data);
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out2:
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krb5_data_free (&ap_req_data);
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return ret;
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}
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static void
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str2data (krb5_data *d,
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const char *fmt,
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...) __attribute__ ((format (printf, 2, 3)));
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static void
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str2data (krb5_data *d,
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const char *fmt,
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...)
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{
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va_list args;
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va_start(args, fmt);
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d->length = vasprintf ((char **)&d->data, fmt, args);
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va_end(args);
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}
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static krb5_error_code
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process_reply (krb5_context context,
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krb5_auth_context auth_context,
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int sock,
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int *result_code,
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krb5_data *result_code_string,
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krb5_data *result_string,
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const char *host)
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{
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krb5_error_code ret;
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u_char reply[BUFSIZ];
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size_t len;
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u_int16_t pkt_len, pkt_ver;
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krb5_data ap_rep_data;
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int save_errno;
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ret = recvfrom (sock, reply, sizeof(reply), 0, NULL, NULL);
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if (ret < 0) {
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save_errno = errno;
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krb5_set_error_string(context, "recvfrom %s: %s",
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host, strerror(save_errno));
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return save_errno;
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}
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len = ret;
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pkt_len = (reply[0] << 8) | (reply[1]);
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pkt_ver = (reply[2] << 8) | (reply[3]);
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if (pkt_len != len) {
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str2data (result_string, "client: wrong len in reply");
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*result_code = KRB5_KPASSWD_MALFORMED;
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return 0;
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}
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if (pkt_ver != 0x0001) {
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str2data (result_string,
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"client: wrong version number (%d)", pkt_ver);
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*result_code = KRB5_KPASSWD_MALFORMED;
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return 0;
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}
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ap_rep_data.data = reply + 6;
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ap_rep_data.length = (reply[4] << 8) | (reply[5]);
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if (ap_rep_data.length) {
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krb5_ap_rep_enc_part *ap_rep;
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krb5_data priv_data;
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u_char *p;
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ret = krb5_rd_rep (context,
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auth_context,
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&ap_rep_data,
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&ap_rep);
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if (ret)
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return ret;
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krb5_free_ap_rep_enc_part (context, ap_rep);
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priv_data.data = (u_char*)ap_rep_data.data + ap_rep_data.length;
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priv_data.length = len - ap_rep_data.length - 6;
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ret = krb5_rd_priv (context,
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auth_context,
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&priv_data,
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result_code_string,
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NULL);
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if (ret) {
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krb5_data_free (result_code_string);
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return ret;
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}
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if (result_code_string->length < 2) {
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*result_code = KRB5_KPASSWD_MALFORMED;
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str2data (result_string,
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"client: bad length in result");
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return 0;
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}
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p = result_code_string->data;
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*result_code = (p[0] << 8) | p[1];
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krb5_data_copy (result_string,
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(unsigned char*)result_code_string->data + 2,
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result_code_string->length - 2);
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return 0;
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} else {
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KRB_ERROR error;
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size_t size;
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u_char *p;
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ret = decode_KRB_ERROR(reply + 6, len - 6, &error, &size);
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if (ret) {
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return ret;
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}
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if (error.e_data->length < 2) {
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krb5_warnx (context, "too short e_data to print anything usable");
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return 1; /* XXX */
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}
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p = error.e_data->data;
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*result_code = (p[0] << 8) | p[1];
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krb5_data_copy (result_string,
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p + 2,
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error.e_data->length - 2);
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return 0;
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}
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}
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/*
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* change the password using the credentials in `creds' (for the
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* principal indicated in them) to `newpw', storing the result of
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* the operation in `result_*' and an error code or 0.
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*/
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krb5_error_code
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krb5_change_password (krb5_context context,
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krb5_creds *creds,
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char *newpw,
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int *result_code,
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krb5_data *result_code_string,
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krb5_data *result_string)
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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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int sock;
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int i;
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struct addrinfo *ai, *a;
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int done = 0;
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char *host = NULL;
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ret = krb5_auth_con_init (context, &auth_context);
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if (ret)
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return ret;
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ret = get_kdc_address (context, creds->client->realm, &ai, &host);
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if (ret)
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goto out;
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for (a = ai; !done && a != NULL; a = a->ai_next) {
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int replied = 0;
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sock = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
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if (sock < 0)
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continue;
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for (i = 0; !done && i < 5; ++i) {
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fd_set fdset;
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struct timeval tv;
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if (!replied) {
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replied = 0;
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ret = send_request (context,
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&auth_context,
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creds,
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sock,
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a->ai_addr,
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a->ai_addrlen,
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newpw,
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host);
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if (ret) {
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close(sock);
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goto out;
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}
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}
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if (sock >= FD_SETSIZE) {
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krb5_set_error_string(context, "fd %d too large", sock);
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ret = ERANGE;
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close (sock);
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goto out;
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}
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FD_ZERO(&fdset);
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FD_SET(sock, &fdset);
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tv.tv_usec = 0;
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tv.tv_sec = 1 + (1 << i);
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ret = select (sock + 1, &fdset, NULL, NULL, &tv);
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if (ret < 0 && errno != EINTR) {
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close(sock);
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goto out;
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}
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if (ret == 1) {
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ret = process_reply (context,
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auth_context,
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sock,
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result_code,
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result_code_string,
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result_string,
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host);
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if (ret == 0)
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done = 1;
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else if (i > 0 && ret == KRB5KRB_AP_ERR_MUT_FAIL)
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replied = 1;
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} else {
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ret = KRB5_KDC_UNREACH;
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}
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}
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close (sock);
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}
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freeaddrinfo (ai);
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out:
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krb5_auth_con_free (context, auth_context);
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free (host);
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if (done)
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return 0;
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else {
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if (ret == KRB5_KDC_UNREACH)
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krb5_set_error_string(context,
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"failed to reach kpasswd server %s "
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"in realm %s",
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host, creds->client->realm);
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return ret;
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}
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}
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