387 lines
9.4 KiB
C
387 lines
9.4 KiB
C
/*
|
|
* Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <krb5_locl.h>
|
|
|
|
RCSID("$Id: changepw.c,v 1.37.2.1 2002/10/21 14:31:58 joda Exp $");
|
|
|
|
static krb5_error_code
|
|
send_request (krb5_context context,
|
|
krb5_auth_context *auth_context,
|
|
krb5_creds *creds,
|
|
int sock,
|
|
char *passwd,
|
|
const char *host)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_data ap_req_data;
|
|
krb5_data krb_priv_data;
|
|
krb5_data passwd_data;
|
|
size_t len;
|
|
u_char header[6];
|
|
u_char *p;
|
|
struct iovec iov[3];
|
|
struct msghdr msghdr;
|
|
|
|
krb5_data_zero (&ap_req_data);
|
|
|
|
ret = krb5_mk_req_extended (context,
|
|
auth_context,
|
|
AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
|
|
NULL, /* in_data */
|
|
creds,
|
|
&ap_req_data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
passwd_data.data = passwd;
|
|
passwd_data.length = strlen(passwd);
|
|
|
|
krb5_data_zero (&krb_priv_data);
|
|
|
|
ret = krb5_mk_priv (context,
|
|
*auth_context,
|
|
&passwd_data,
|
|
&krb_priv_data,
|
|
NULL);
|
|
if (ret)
|
|
goto out2;
|
|
|
|
len = 6 + ap_req_data.length + krb_priv_data.length;
|
|
p = header;
|
|
*p++ = (len >> 8) & 0xFF;
|
|
*p++ = (len >> 0) & 0xFF;
|
|
*p++ = 0;
|
|
*p++ = 1;
|
|
*p++ = (ap_req_data.length >> 8) & 0xFF;
|
|
*p++ = (ap_req_data.length >> 0) & 0xFF;
|
|
|
|
memset(&msghdr, 0, sizeof(msghdr));
|
|
msghdr.msg_name = NULL;
|
|
msghdr.msg_namelen = 0;
|
|
msghdr.msg_iov = iov;
|
|
msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov);
|
|
#if 0
|
|
msghdr.msg_control = NULL;
|
|
msghdr.msg_controllen = 0;
|
|
#endif
|
|
|
|
iov[0].iov_base = (void*)header;
|
|
iov[0].iov_len = 6;
|
|
iov[1].iov_base = ap_req_data.data;
|
|
iov[1].iov_len = ap_req_data.length;
|
|
iov[2].iov_base = krb_priv_data.data;
|
|
iov[2].iov_len = krb_priv_data.length;
|
|
|
|
if (sendmsg (sock, &msghdr, 0) < 0) {
|
|
ret = errno;
|
|
krb5_set_error_string(context, "sendmsg %s: %s", host, strerror(ret));
|
|
}
|
|
|
|
krb5_data_free (&krb_priv_data);
|
|
out2:
|
|
krb5_data_free (&ap_req_data);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
str2data (krb5_data *d,
|
|
const char *fmt,
|
|
...) __attribute__ ((format (printf, 2, 3)));
|
|
|
|
static void
|
|
str2data (krb5_data *d,
|
|
const char *fmt,
|
|
...)
|
|
{
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
d->length = vasprintf ((char **)&d->data, fmt, args);
|
|
va_end(args);
|
|
}
|
|
|
|
static krb5_error_code
|
|
process_reply (krb5_context context,
|
|
krb5_auth_context auth_context,
|
|
int sock,
|
|
int *result_code,
|
|
krb5_data *result_code_string,
|
|
krb5_data *result_string,
|
|
const char *host)
|
|
{
|
|
krb5_error_code ret;
|
|
u_char reply[BUFSIZ];
|
|
size_t len;
|
|
u_int16_t pkt_len, pkt_ver;
|
|
krb5_data ap_rep_data, priv_data;
|
|
int save_errno;
|
|
|
|
ret = recvfrom (sock, reply, sizeof(reply), 0, NULL, NULL);
|
|
if (ret < 0) {
|
|
save_errno = errno;
|
|
krb5_set_error_string(context, "recvfrom %s: %s",
|
|
host, strerror(save_errno));
|
|
return save_errno;
|
|
}
|
|
|
|
len = ret;
|
|
pkt_len = (reply[0] << 8) | (reply[1]);
|
|
pkt_ver = (reply[2] << 8) | (reply[3]);
|
|
|
|
if (pkt_len != len) {
|
|
str2data (result_string, "client: wrong len in reply");
|
|
*result_code = KRB5_KPASSWD_MALFORMED;
|
|
return 0;
|
|
}
|
|
if (pkt_ver != 0x0001) {
|
|
str2data (result_string,
|
|
"client: wrong version number (%d)", pkt_ver);
|
|
*result_code = KRB5_KPASSWD_MALFORMED;
|
|
return 0;
|
|
}
|
|
|
|
ap_rep_data.data = reply + 6;
|
|
ap_rep_data.length = (reply[4] << 8) | (reply[5]);
|
|
priv_data.data = (u_char*)ap_rep_data.data + ap_rep_data.length;
|
|
priv_data.length = len - ap_rep_data.length - 6;
|
|
if ((u_char *)priv_data.data + priv_data.length > reply + len)
|
|
return KRB5_KPASSWD_MALFORMED;
|
|
|
|
if (ap_rep_data.length) {
|
|
krb5_ap_rep_enc_part *ap_rep;
|
|
u_char *p;
|
|
|
|
ret = krb5_rd_rep (context,
|
|
auth_context,
|
|
&ap_rep_data,
|
|
&ap_rep);
|
|
if (ret)
|
|
return ret;
|
|
|
|
krb5_free_ap_rep_enc_part (context, ap_rep);
|
|
|
|
ret = krb5_rd_priv (context,
|
|
auth_context,
|
|
&priv_data,
|
|
result_code_string,
|
|
NULL);
|
|
if (ret) {
|
|
krb5_data_free (result_code_string);
|
|
return ret;
|
|
}
|
|
|
|
if (result_code_string->length < 2) {
|
|
*result_code = KRB5_KPASSWD_MALFORMED;
|
|
str2data (result_string,
|
|
"client: bad length in result");
|
|
return 0;
|
|
}
|
|
p = result_code_string->data;
|
|
|
|
*result_code = (p[0] << 8) | p[1];
|
|
krb5_data_copy (result_string,
|
|
(unsigned char*)result_code_string->data + 2,
|
|
result_code_string->length - 2);
|
|
return 0;
|
|
} else {
|
|
KRB_ERROR error;
|
|
size_t size;
|
|
u_char *p;
|
|
|
|
ret = decode_KRB_ERROR(reply + 6, len - 6, &error, &size);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
if (error.e_data->length < 2) {
|
|
krb5_warnx (context, "too short e_data to print anything usable");
|
|
return 1; /* XXX */
|
|
}
|
|
|
|
p = error.e_data->data;
|
|
*result_code = (p[0] << 8) | p[1];
|
|
krb5_data_copy (result_string,
|
|
p + 2,
|
|
error.e_data->length - 2);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* change the password using the credentials in `creds' (for the
|
|
* principal indicated in them) to `newpw', storing the result of
|
|
* the operation in `result_*' and an error code or 0.
|
|
*/
|
|
|
|
krb5_error_code
|
|
krb5_change_password (krb5_context context,
|
|
krb5_creds *creds,
|
|
char *newpw,
|
|
int *result_code,
|
|
krb5_data *result_code_string,
|
|
krb5_data *result_string)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_auth_context auth_context = NULL;
|
|
krb5_krbhst_handle handle = NULL;
|
|
krb5_krbhst_info *hi;
|
|
int sock;
|
|
int i;
|
|
int done = 0;
|
|
krb5_realm realm = creds->client->realm;
|
|
|
|
ret = krb5_auth_con_init (context, &auth_context);
|
|
if (ret)
|
|
return ret;
|
|
|
|
krb5_auth_con_setflags (context, auth_context,
|
|
KRB5_AUTH_CONTEXT_DO_SEQUENCE);
|
|
|
|
ret = krb5_krbhst_init (context, realm, KRB5_KRBHST_CHANGEPW, &handle);
|
|
if (ret)
|
|
goto out;
|
|
|
|
while (!done && (ret = krb5_krbhst_next(context, handle, &hi)) == 0) {
|
|
struct addrinfo *ai, *a;
|
|
|
|
ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
|
|
if (ret)
|
|
continue;
|
|
|
|
for (a = ai; !done && a != NULL; a = a->ai_next) {
|
|
int replied = 0;
|
|
|
|
sock = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
|
|
if (sock < 0)
|
|
continue;
|
|
|
|
ret = connect(sock, a->ai_addr, a->ai_addrlen);
|
|
if (ret < 0) {
|
|
close (sock);
|
|
goto out;
|
|
}
|
|
|
|
ret = krb5_auth_con_genaddrs (context, auth_context, sock,
|
|
KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR);
|
|
if (ret) {
|
|
close (sock);
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; !done && i < 5; ++i) {
|
|
fd_set fdset;
|
|
struct timeval tv;
|
|
|
|
if (!replied) {
|
|
replied = 0;
|
|
ret = send_request (context,
|
|
&auth_context,
|
|
creds,
|
|
sock,
|
|
newpw,
|
|
hi->hostname);
|
|
if (ret) {
|
|
close(sock);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (sock >= FD_SETSIZE) {
|
|
krb5_set_error_string(context, "fd %d too large", sock);
|
|
ret = ERANGE;
|
|
close (sock);
|
|
goto out;
|
|
}
|
|
|
|
FD_ZERO(&fdset);
|
|
FD_SET(sock, &fdset);
|
|
tv.tv_usec = 0;
|
|
tv.tv_sec = 1 + (1 << i);
|
|
|
|
ret = select (sock + 1, &fdset, NULL, NULL, &tv);
|
|
if (ret < 0 && errno != EINTR) {
|
|
close(sock);
|
|
goto out;
|
|
}
|
|
if (ret == 1) {
|
|
ret = process_reply (context,
|
|
auth_context,
|
|
sock,
|
|
result_code,
|
|
result_code_string,
|
|
result_string,
|
|
hi->hostname);
|
|
if (ret == 0)
|
|
done = 1;
|
|
else if (i > 0 && ret == KRB5KRB_AP_ERR_MUT_FAIL)
|
|
replied = 1;
|
|
} else {
|
|
ret = KRB5_KDC_UNREACH;
|
|
}
|
|
}
|
|
close (sock);
|
|
}
|
|
}
|
|
|
|
out:
|
|
krb5_krbhst_free (context, handle);
|
|
krb5_auth_con_free (context, auth_context);
|
|
if (done)
|
|
return 0;
|
|
else {
|
|
if (ret == KRB5_KDC_UNREACH)
|
|
krb5_set_error_string(context,
|
|
"unable to reach any changepw server "
|
|
" in realm %s", realm);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
const char *
|
|
krb5_passwd_result_to_string (krb5_context context,
|
|
int result)
|
|
{
|
|
static const char *strings[] = {
|
|
"Success",
|
|
"Malformed",
|
|
"Hard error",
|
|
"Auth error",
|
|
"Soft error"
|
|
};
|
|
|
|
if (result < 0 || result > KRB5_KPASSWD_SOFTERROR)
|
|
return "unknown result code";
|
|
else
|
|
return strings[result];
|
|
}
|