603 lines
15 KiB
C
603 lines
15 KiB
C
/*
|
|
* Copyright (c) 1997-2001 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 "kpasswd_locl.h"
|
|
RCSID("$Id: kpasswdd.c,v 1.51 2001/05/14 06:18:56 assar Exp $");
|
|
|
|
#include <kadm5/admin.h>
|
|
|
|
#include <hdb.h>
|
|
|
|
static krb5_context context;
|
|
static krb5_log_facility *log_facility;
|
|
|
|
static sig_atomic_t exit_flag = 0;
|
|
|
|
static void
|
|
send_reply (int s,
|
|
struct sockaddr *sa,
|
|
int sa_size,
|
|
krb5_data *ap_rep,
|
|
krb5_data *rest)
|
|
{
|
|
struct msghdr msghdr;
|
|
struct iovec iov[3];
|
|
u_int16_t len, ap_rep_len;
|
|
u_char header[6];
|
|
u_char *p;
|
|
|
|
if (ap_rep)
|
|
ap_rep_len = ap_rep->length;
|
|
else
|
|
ap_rep_len = 0;
|
|
|
|
len = 6 + ap_rep_len + rest->length;
|
|
p = header;
|
|
*p++ = (len >> 8) & 0xFF;
|
|
*p++ = (len >> 0) & 0xFF;
|
|
*p++ = 0;
|
|
*p++ = 1;
|
|
*p++ = (ap_rep_len >> 8) & 0xFF;
|
|
*p++ = (ap_rep_len >> 0) & 0xFF;
|
|
|
|
memset (&msghdr, 0, sizeof(msghdr));
|
|
msghdr.msg_name = (void *)sa;
|
|
msghdr.msg_namelen = sa_size;
|
|
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 = (char *)header;
|
|
iov[0].iov_len = 6;
|
|
if (ap_rep_len) {
|
|
iov[1].iov_base = ap_rep->data;
|
|
iov[1].iov_len = ap_rep->length;
|
|
} else {
|
|
iov[1].iov_base = NULL;
|
|
iov[1].iov_len = 0;
|
|
}
|
|
iov[2].iov_base = rest->data;
|
|
iov[2].iov_len = rest->length;
|
|
|
|
if (sendmsg (s, &msghdr, 0) < 0)
|
|
krb5_warn (context, errno, "sendmsg");
|
|
}
|
|
|
|
static int
|
|
make_result (krb5_data *data,
|
|
u_int16_t result_code,
|
|
const char *expl)
|
|
{
|
|
krb5_data_zero (data);
|
|
|
|
data->length = asprintf ((char **)&data->data,
|
|
"%c%c%s",
|
|
(result_code >> 8) & 0xFF,
|
|
result_code & 0xFF,
|
|
expl);
|
|
|
|
if (data->data == NULL) {
|
|
krb5_warnx (context, "Out of memory generating error reply");
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
reply_error (krb5_principal server,
|
|
int s,
|
|
struct sockaddr *sa,
|
|
int sa_size,
|
|
krb5_error_code error_code,
|
|
u_int16_t result_code,
|
|
const char *expl)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_data error_data;
|
|
krb5_data e_data;
|
|
|
|
if (make_result(&e_data, result_code, expl))
|
|
return;
|
|
|
|
ret = krb5_mk_error (context,
|
|
error_code,
|
|
NULL,
|
|
&e_data,
|
|
NULL,
|
|
server,
|
|
NULL,
|
|
NULL,
|
|
&error_data);
|
|
krb5_data_free (&e_data);
|
|
if (ret) {
|
|
krb5_warn (context, ret, "Could not even generate error reply");
|
|
return;
|
|
}
|
|
send_reply (s, sa, sa_size, NULL, &error_data);
|
|
krb5_data_free (&error_data);
|
|
}
|
|
|
|
static void
|
|
reply_priv (krb5_auth_context auth_context,
|
|
int s,
|
|
struct sockaddr *sa,
|
|
int sa_size,
|
|
u_int16_t result_code,
|
|
const char *expl)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_data krb_priv_data;
|
|
krb5_data ap_rep_data;
|
|
krb5_data e_data;
|
|
|
|
ret = krb5_mk_rep (context,
|
|
auth_context,
|
|
&ap_rep_data);
|
|
if (ret) {
|
|
krb5_warn (context, ret, "Could not even generate error reply");
|
|
return;
|
|
}
|
|
|
|
if (make_result(&e_data, result_code, expl))
|
|
return;
|
|
|
|
ret = krb5_mk_priv (context,
|
|
auth_context,
|
|
&e_data,
|
|
&krb_priv_data,
|
|
NULL);
|
|
krb5_data_free (&e_data);
|
|
if (ret) {
|
|
krb5_warn (context, ret, "Could not even generate error reply");
|
|
return;
|
|
}
|
|
send_reply (s, sa, sa_size, &ap_rep_data, &krb_priv_data);
|
|
krb5_data_free (&ap_rep_data);
|
|
krb5_data_free (&krb_priv_data);
|
|
}
|
|
|
|
/*
|
|
* Change the password for `principal', sending the reply back on `s'
|
|
* (`sa', `sa_size') to `pwd_data'.
|
|
*/
|
|
|
|
static void
|
|
change (krb5_auth_context auth_context,
|
|
krb5_principal principal,
|
|
int s,
|
|
struct sockaddr *sa,
|
|
int sa_size,
|
|
krb5_data *pwd_data)
|
|
{
|
|
krb5_error_code ret;
|
|
char *client;
|
|
const char *pwd_reason;
|
|
kadm5_config_params conf;
|
|
void *kadm5_handle;
|
|
char *tmp;
|
|
|
|
memset (&conf, 0, sizeof(conf));
|
|
|
|
krb5_unparse_name (context, principal, &client);
|
|
|
|
ret = kadm5_init_with_password_ctx(context,
|
|
client,
|
|
NULL,
|
|
KADM5_ADMIN_SERVICE,
|
|
&conf, 0, 0,
|
|
&kadm5_handle);
|
|
if (ret) {
|
|
free (client);
|
|
krb5_warn (context, ret, "kadm5_init_with_password_ctx");
|
|
reply_priv (auth_context, s, sa, sa_size, 2,
|
|
"Internal error");
|
|
return;
|
|
}
|
|
|
|
krb5_warnx (context, "Changing password for %s", client);
|
|
free (client);
|
|
|
|
pwd_reason = kadm5_check_password_quality (context, principal, pwd_data);
|
|
if (pwd_reason != NULL ) {
|
|
krb5_warnx (context, "%s", pwd_reason);
|
|
reply_priv (auth_context, s, sa, sa_size, 4, pwd_reason);
|
|
kadm5_destroy (kadm5_handle);
|
|
return;
|
|
}
|
|
|
|
tmp = malloc (pwd_data->length + 1);
|
|
if (tmp == NULL) {
|
|
krb5_warnx (context, "malloc: out of memory");
|
|
reply_priv (auth_context, s, sa, sa_size, 2,
|
|
"Internal error");
|
|
goto out;
|
|
}
|
|
memcpy (tmp, pwd_data->data, pwd_data->length);
|
|
tmp[pwd_data->length] = '\0';
|
|
|
|
ret = kadm5_s_chpass_principal_cond (kadm5_handle, principal, tmp);
|
|
memset (tmp, 0, pwd_data->length);
|
|
free (tmp);
|
|
if (ret) {
|
|
krb5_warn (context, ret, "kadm5_s_chpass_principal_cond");
|
|
reply_priv (auth_context, s, sa, sa_size, 2,
|
|
"Internal error");
|
|
goto out;
|
|
}
|
|
reply_priv (auth_context, s, sa, sa_size, 0, "Password changed");
|
|
out:
|
|
kadm5_destroy (kadm5_handle);
|
|
}
|
|
|
|
static int
|
|
verify (krb5_auth_context *auth_context,
|
|
krb5_principal server,
|
|
krb5_keytab keytab,
|
|
krb5_ticket **ticket,
|
|
krb5_data *out_data,
|
|
int s,
|
|
struct sockaddr *sa,
|
|
int sa_size,
|
|
u_char *msg,
|
|
size_t len)
|
|
{
|
|
krb5_error_code ret;
|
|
u_int16_t pkt_len, pkt_ver, ap_req_len;
|
|
krb5_data ap_req_data;
|
|
krb5_data krb_priv_data;
|
|
|
|
pkt_len = (msg[0] << 8) | (msg[1]);
|
|
pkt_ver = (msg[2] << 8) | (msg[3]);
|
|
ap_req_len = (msg[4] << 8) | (msg[5]);
|
|
if (pkt_len != len) {
|
|
krb5_warnx (context, "Strange len: %ld != %ld",
|
|
(long)pkt_len, (long)len);
|
|
reply_error (server, s, sa, sa_size, 0, 1, "Bad request");
|
|
return 1;
|
|
}
|
|
if (pkt_ver != 0x0001) {
|
|
krb5_warnx (context, "Bad version (%d)", pkt_ver);
|
|
reply_error (server, s, sa, sa_size, 0, 1, "Wrong program version");
|
|
return 1;
|
|
}
|
|
|
|
ap_req_data.data = msg + 6;
|
|
ap_req_data.length = ap_req_len;
|
|
|
|
ret = krb5_rd_req (context,
|
|
auth_context,
|
|
&ap_req_data,
|
|
server,
|
|
keytab,
|
|
NULL,
|
|
ticket);
|
|
if (ret) {
|
|
if(ret == KRB5_KT_NOTFOUND) {
|
|
char *name;
|
|
krb5_unparse_name(context, server, &name);
|
|
krb5_warnx (context, "krb5_rd_req: %s (%s)",
|
|
krb5_get_err_text(context, ret), name);
|
|
free(name);
|
|
} else
|
|
krb5_warn (context, ret, "krb5_rd_req");
|
|
reply_error (server, s, sa, sa_size, ret, 3, "Authentication failed");
|
|
return 1;
|
|
}
|
|
|
|
if (!(*ticket)->ticket.flags.initial) {
|
|
krb5_warnx (context, "initial flag not set");
|
|
reply_error (server, s, sa, sa_size, ret, 1,
|
|
"Bad request");
|
|
goto out;
|
|
}
|
|
krb_priv_data.data = msg + 6 + ap_req_len;
|
|
krb_priv_data.length = len - 6 - ap_req_len;
|
|
|
|
ret = krb5_rd_priv (context,
|
|
*auth_context,
|
|
&krb_priv_data,
|
|
out_data,
|
|
NULL);
|
|
|
|
if (ret) {
|
|
krb5_warn (context, ret, "krb5_rd_priv");
|
|
reply_error (server, s, sa, sa_size, ret, 3, "Bad request");
|
|
goto out;
|
|
}
|
|
return 0;
|
|
out:
|
|
krb5_free_ticket (context, *ticket);
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
process (krb5_principal server,
|
|
krb5_keytab keytab,
|
|
int s,
|
|
krb5_address *this_addr,
|
|
struct sockaddr *sa,
|
|
int sa_size,
|
|
u_char *msg,
|
|
int len)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_auth_context auth_context = NULL;
|
|
krb5_data out_data;
|
|
krb5_ticket *ticket;
|
|
krb5_address other_addr;
|
|
|
|
krb5_data_zero (&out_data);
|
|
|
|
ret = krb5_auth_con_init (context, &auth_context);
|
|
if (ret) {
|
|
krb5_warn (context, ret, "krb5_auth_con_init");
|
|
return;
|
|
}
|
|
|
|
krb5_auth_con_setflags (context, auth_context,
|
|
KRB5_AUTH_CONTEXT_DO_SEQUENCE);
|
|
|
|
ret = krb5_sockaddr2address (context, sa, &other_addr);
|
|
if (ret) {
|
|
krb5_warn (context, ret, "krb5_sockaddr2address");
|
|
goto out;
|
|
}
|
|
|
|
ret = krb5_auth_con_setaddrs (context,
|
|
auth_context,
|
|
this_addr,
|
|
&other_addr);
|
|
krb5_free_address (context, &other_addr);
|
|
if (ret) {
|
|
krb5_warn (context, ret, "krb5_auth_con_setaddr");
|
|
goto out;
|
|
}
|
|
|
|
if (verify (&auth_context, server, keytab, &ticket, &out_data,
|
|
s, sa, sa_size, msg, len) == 0) {
|
|
change (auth_context,
|
|
ticket->client,
|
|
s,
|
|
sa, sa_size,
|
|
&out_data);
|
|
memset (out_data.data, 0, out_data.length);
|
|
krb5_free_ticket (context, ticket);
|
|
free (ticket);
|
|
}
|
|
|
|
out:
|
|
krb5_data_free (&out_data);
|
|
krb5_auth_con_free (context, auth_context);
|
|
}
|
|
|
|
static int
|
|
doit (krb5_keytab keytab, int port)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_principal server;
|
|
int *sockets;
|
|
int maxfd;
|
|
char *realm;
|
|
krb5_addresses addrs;
|
|
unsigned n, i;
|
|
fd_set real_fdset;
|
|
struct sockaddr_storage __ss;
|
|
struct sockaddr *sa = (struct sockaddr *)&__ss;
|
|
|
|
ret = krb5_get_default_realm (context, &realm);
|
|
if (ret)
|
|
krb5_err (context, 1, ret, "krb5_get_default_realm");
|
|
|
|
ret = krb5_build_principal (context,
|
|
&server,
|
|
strlen(realm),
|
|
realm,
|
|
"kadmin",
|
|
"changepw",
|
|
NULL);
|
|
if (ret)
|
|
krb5_err (context, 1, ret, "krb5_build_principal");
|
|
|
|
free (realm);
|
|
|
|
ret = krb5_get_all_server_addrs (context, &addrs);
|
|
if (ret)
|
|
krb5_err (context, 1, ret, "krb5_get_all_server_addrs");
|
|
|
|
n = addrs.len;
|
|
|
|
sockets = malloc (n * sizeof(*sockets));
|
|
if (sockets == NULL)
|
|
krb5_errx (context, 1, "out of memory");
|
|
maxfd = 0;
|
|
FD_ZERO(&real_fdset);
|
|
for (i = 0; i < n; ++i) {
|
|
int sa_size;
|
|
|
|
krb5_addr2sockaddr (context, &addrs.val[i], sa, &sa_size, port);
|
|
|
|
sockets[i] = socket (sa->sa_family, SOCK_DGRAM, 0);
|
|
if (sockets[i] < 0)
|
|
krb5_err (context, 1, errno, "socket");
|
|
if (bind (sockets[i], sa, sa_size) < 0) {
|
|
char str[128];
|
|
size_t len;
|
|
ret = krb5_print_address (&addrs.val[i], str, sizeof(str), &len);
|
|
krb5_err (context, 1, errno, "bind(%s)", str);
|
|
}
|
|
maxfd = max (maxfd, sockets[i]);
|
|
if (maxfd >= FD_SETSIZE)
|
|
krb5_errx (context, 1, "fd too large");
|
|
FD_SET(sockets[i], &real_fdset);
|
|
}
|
|
|
|
while(exit_flag == 0) {
|
|
int ret;
|
|
fd_set fdset = real_fdset;
|
|
|
|
ret = select (maxfd + 1, &fdset, NULL, NULL, NULL);
|
|
if (ret < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
else
|
|
krb5_err (context, 1, errno, "select");
|
|
}
|
|
for (i = 0; i < n; ++i)
|
|
if (FD_ISSET(sockets[i], &fdset)) {
|
|
u_char buf[BUFSIZ];
|
|
socklen_t addrlen = sizeof(__ss);
|
|
|
|
ret = recvfrom (sockets[i], buf, sizeof(buf), 0,
|
|
sa, &addrlen);
|
|
if (ret < 0) {
|
|
if(errno == EINTR)
|
|
break;
|
|
else
|
|
krb5_err (context, 1, errno, "recvfrom");
|
|
}
|
|
|
|
process (server, keytab, sockets[i],
|
|
&addrs.val[i],
|
|
sa, addrlen,
|
|
buf, ret);
|
|
}
|
|
}
|
|
krb5_free_addresses (context, &addrs);
|
|
krb5_free_principal (context, server);
|
|
krb5_free_context (context);
|
|
return 0;
|
|
}
|
|
|
|
static RETSIGTYPE
|
|
sigterm(int sig)
|
|
{
|
|
exit_flag = 1;
|
|
}
|
|
|
|
const char *check_library = NULL;
|
|
const char *check_function = NULL;
|
|
char *keytab_str = "HDB:";
|
|
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);
|
|
}
|