krb5_error_code smb_krb5_send_and_recv_func(krb5_context context,
void *data,
krb5_krbhst_info *hi,
time_t timeout,
const krb5_data *send_buf,
krb5_data *recv_buf)
{
krb5_error_code ret;
struct addrinfo *ai;
struct tevent_context *ev;
TALLOC_CTX *tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) {
return ENOMEM;
}
if (!data) {
/* If no event context was available, then create one for this loop */
ev = samba_tevent_context_init(tmp_ctx);
if (!ev) {
talloc_free(tmp_ctx);
return ENOMEM;
}
} else {
ev = talloc_get_type_abort(data, struct tevent_context);
}
ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
if (ret) {
talloc_free(tmp_ctx);
return ret;
}
return smb_krb5_send_and_recv_func_int(context, ev, hi, ai, smb_krb5_send_and_recv_func, data, timeout, send_buf, recv_buf);
}
/* Heimdal */
krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
{
krb5_krbhst_handle hnd;
krb5_krbhst_info *hinfo;
krb5_error_code rc;
int num_kdcs, i;
struct sockaddr *sa;
struct addrinfo *ai;
*addr_pp = NULL;
*naddrs = 0;
rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
if (rc) {
DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
return rc;
}
for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
;
krb5_krbhst_reset(ctx, hnd);
if (!num_kdcs) {
DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
krb5_krbhst_free(ctx, hnd);
return -1;
}
sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
if (!sa) {
DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
krb5_krbhst_free(ctx, hnd);
naddrs = 0;
return -1;
}
memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
#if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
if (rc) {
DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
continue;
}
#endif
if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
}
krb5_krbhst_free(ctx, hnd);
*naddrs = num_kdcs;
*addr_pp = sa;
return 0;
}
static krb5_error_code
change_password_loop (krb5_context context,
krb5_creds *creds,
krb5_principal targprinc,
char *newpw,
int *result_code,
krb5_data *result_code_string,
krb5_data *result_string,
struct kpwd_proc *proc)
{
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;
int is_stream;
switch (hi->proto) {
case KRB5_KRBHST_UDP:
if ((proc->flags & SUPPORT_UDP) == 0)
continue;
is_stream = 0;
break;
case KRB5_KRBHST_TCP:
if ((proc->flags & SUPPORT_TCP) == 0)
continue;
is_stream = 1;
break;
default:
continue;
}
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 = (*proc->send_req) (context,
&auth_context,
creds,
targprinc,
is_stream,
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 = (*proc->process_rep) (context,
auth_context,
is_stream,
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);
*result_code = KRB5_KPASSWD_HARDERROR;
}
return ret;
}
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_sendto (krb5_context context,
const krb5_data *send_data,
krb5_krbhst_handle handle,
krb5_data *receive)
{
krb5_error_code ret;
krb5_socket_t fd;
size_t i;
krb5_data_zero(receive);
for (i = 0; i < context->max_retries; ++i) {
krb5_krbhst_info *hi;
while (krb5_krbhst_next(context, handle, &hi) == 0) {
struct addrinfo *ai, *a;
_krb5_debug(context, 2,
"trying to communicate with host %s in realm %s",
hi->hostname, _krb5_krbhst_get_realm(handle));
if (context->send_to_kdc) {
struct send_to_kdc *s = context->send_to_kdc;
ret = (*s->func)(context, s->data, hi,
context->kdc_timeout, send_data, receive);
if (ret == 0 && receive->length != 0)
goto out;
continue;
}
ret = send_via_plugin(context, hi, context->kdc_timeout,
send_data, receive);
if (ret == 0 && receive->length != 0)
goto out;
else if (ret != KRB5_PLUGIN_NO_HANDLE)
continue;
if(hi->proto == KRB5_KRBHST_HTTP && context->http_proxy) {
if (send_via_proxy (context, hi, send_data, receive) == 0) {
ret = 0;
goto out;
}
continue;
}
ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
if (ret)
continue;
for (a = ai; a != NULL; a = a->ai_next) {
fd = socket (a->ai_family, a->ai_socktype | SOCK_CLOEXEC, a->ai_protocol);
if (rk_IS_BAD_SOCKET(fd))
continue;
rk_cloexec(fd);
if (timed_connect (fd, a, context->kdc_timeout) < 0) {
rk_closesocket (fd);
continue;
}
switch (hi->proto) {
case KRB5_KRBHST_HTTP :
ret = send_and_recv_http(fd, context->kdc_timeout,
"", send_data, receive);
break;
case KRB5_KRBHST_TCP :
ret = send_and_recv_tcp (fd, context->kdc_timeout,
send_data, receive);
break;
case KRB5_KRBHST_UDP :
ret = send_and_recv_udp (fd, context->kdc_timeout,
send_data, receive);
break;
}
rk_closesocket (fd);
if(ret == 0 && receive->length != 0)
goto out;
}
}
krb5_krbhst_reset(context, handle);
}
krb5_clear_error_message (context);
ret = KRB5_KDC_UNREACH;
out:
_krb5_debug(context, 2,
"result of trying to talk to realm %s = %d",
_krb5_krbhst_get_realm(handle), ret);
return ret;
}
krb5_error_code smb_krb5_send_and_recv_func(krb5_context context,
void *data,
krb5_krbhst_info *hi,
time_t timeout,
const krb5_data *send_buf,
krb5_data *recv_buf)
{
krb5_error_code ret;
NTSTATUS status;
struct socket_address *remote_addr;
const char *name;
struct addrinfo *ai, *a;
struct smb_krb5_socket *smb_krb5;
struct tevent_context *ev = talloc_get_type(data, struct tevent_context);
DATA_BLOB send_blob = data_blob_const(send_buf->data, send_buf->length);
ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
if (ret) {
return ret;
}
for (a = ai; a; a = ai->ai_next) {
smb_krb5 = talloc(NULL, struct smb_krb5_socket);
if (!smb_krb5) {
return ENOMEM;
}
smb_krb5->hi = hi;
switch (a->ai_family) {
case PF_INET:
name = "ipv4";
break;
#ifdef HAVE_IPV6
case PF_INET6:
name = "ipv6";
break;
#endif
default:
talloc_free(smb_krb5);
return EINVAL;
}
status = NT_STATUS_INVALID_PARAMETER;
switch (hi->proto) {
case KRB5_KRBHST_UDP:
status = socket_create(name, SOCKET_TYPE_DGRAM, &smb_krb5->sock, 0);
break;
case KRB5_KRBHST_TCP:
status = socket_create(name, SOCKET_TYPE_STREAM, &smb_krb5->sock, 0);
break;
case KRB5_KRBHST_HTTP:
talloc_free(smb_krb5);
return EINVAL;
}
if (!NT_STATUS_IS_OK(status)) {
talloc_free(smb_krb5);
continue;
}
talloc_steal(smb_krb5, smb_krb5->sock);
remote_addr = socket_address_from_sockaddr(smb_krb5, a->ai_addr, a->ai_addrlen);
if (!remote_addr) {
talloc_free(smb_krb5);
continue;
}
status = socket_connect_ev(smb_krb5->sock, NULL, remote_addr, 0, ev);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(smb_krb5);
continue;
}
talloc_free(remote_addr);
/* Setup the FDE, start listening for read events
* from the start (otherwise we may miss a socket
* drop) and mark as AUTOCLOSE along with the fde */
/* Ths is equivilant to EVENT_FD_READABLE(smb_krb5->fde) */
smb_krb5->fde = tevent_add_fd(ev, smb_krb5->sock,
socket_get_fd(smb_krb5->sock),
TEVENT_FD_READ,
smb_krb5_socket_handler, smb_krb5);
/* its now the job of the event layer to close the socket */
tevent_fd_set_close_fn(smb_krb5->fde, socket_tevent_fd_close_fn);
socket_set_flags(smb_krb5->sock, SOCKET_FLAG_NOCLOSE);
tevent_add_timer(ev, smb_krb5,
timeval_current_ofs(timeout, 0),
smb_krb5_request_timeout, smb_krb5);
smb_krb5->status = NT_STATUS_OK;
smb_krb5->reply = data_blob(NULL, 0);
switch (hi->proto) {
case KRB5_KRBHST_UDP:
TEVENT_FD_WRITEABLE(smb_krb5->fde);
smb_krb5->request = send_blob;
break;
case KRB5_KRBHST_TCP:
smb_krb5->packet = packet_init(smb_krb5);
if (smb_krb5->packet == NULL) {
talloc_free(smb_krb5);
return ENOMEM;
}
packet_set_private(smb_krb5->packet, smb_krb5);
packet_set_socket(smb_krb5->packet, smb_krb5->sock);
packet_set_callback(smb_krb5->packet, smb_krb5_full_packet);
packet_set_full_request(smb_krb5->packet, packet_full_request_u32);
packet_set_error_handler(smb_krb5->packet, smb_krb5_error_handler);
packet_set_event_context(smb_krb5->packet, ev);
packet_set_fde(smb_krb5->packet, smb_krb5->fde);
smb_krb5->request = data_blob_talloc(smb_krb5, NULL, send_blob.length + 4);
RSIVAL(smb_krb5->request.data, 0, send_blob.length);
memcpy(smb_krb5->request.data+4, send_blob.data, send_blob.length);
packet_send(smb_krb5->packet, smb_krb5->request);
break;
case KRB5_KRBHST_HTTP:
talloc_free(smb_krb5);
return EINVAL;
}
while ((NT_STATUS_IS_OK(smb_krb5->status)) && !smb_krb5->reply.length) {
if (tevent_loop_once(ev) != 0) {
talloc_free(smb_krb5);
return EINVAL;
}
}
if (NT_STATUS_EQUAL(smb_krb5->status, NT_STATUS_IO_TIMEOUT)) {
talloc_free(smb_krb5);
continue;
}
if (!NT_STATUS_IS_OK(smb_krb5->status)) {
DEBUG(2,("Error reading smb_krb5 reply packet: %s\n", nt_errstr(smb_krb5->status)));
talloc_free(smb_krb5);
continue;
}
ret = krb5_data_copy(recv_buf, smb_krb5->reply.data, smb_krb5->reply.length);
if (ret) {
talloc_free(smb_krb5);
return ret;
}
talloc_free(smb_krb5);
break;
}
if (a) {
return 0;
}
return KRB5_KDC_UNREACH;
}
krb5_error_code smb_krb5_send_and_recv_func(krb5_context context,
void *data,
krb5_krbhst_info *hi,
time_t timeout,
const krb5_data *send_buf,
krb5_data *recv_buf)
{
krb5_error_code ret;
NTSTATUS status;
const char *name;
struct addrinfo *ai, *a;
struct smb_krb5_socket *smb_krb5;
DATA_BLOB send_blob;
struct tevent_context *ev;
TALLOC_CTX *tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) {
return ENOMEM;
}
if (!data) {
/* If no event context was available, then create one for this loop */
ev = samba_tevent_context_init(tmp_ctx);
if (!ev) {
talloc_free(tmp_ctx);
return ENOMEM;
}
} else {
ev = talloc_get_type_abort(data, struct tevent_context);
}
send_blob = data_blob_const(send_buf->data, send_buf->length);
ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
if (ret) {
talloc_free(tmp_ctx);
return ret;
}
for (a = ai; a; a = a->ai_next) {
struct socket_address *remote_addr;
smb_krb5 = talloc(tmp_ctx, struct smb_krb5_socket);
if (!smb_krb5) {
talloc_free(tmp_ctx);
return ENOMEM;
}
smb_krb5->hi = hi;
switch (a->ai_family) {
case PF_INET:
name = "ipv4";
break;
#ifdef HAVE_IPV6
case PF_INET6:
name = "ipv6";
break;
#endif
default:
talloc_free(tmp_ctx);
return EINVAL;
}
status = NT_STATUS_INVALID_PARAMETER;
switch (hi->proto) {
case KRB5_KRBHST_UDP:
status = socket_create(name, SOCKET_TYPE_DGRAM, &smb_krb5->sock, 0);
break;
case KRB5_KRBHST_TCP:
status = socket_create(name, SOCKET_TYPE_STREAM, &smb_krb5->sock, 0);
break;
case KRB5_KRBHST_HTTP:
talloc_free(tmp_ctx);
return EINVAL;
}
if (!NT_STATUS_IS_OK(status)) {
talloc_free(smb_krb5);
continue;
}
talloc_steal(smb_krb5, smb_krb5->sock);
remote_addr = socket_address_from_sockaddr(smb_krb5, a->ai_addr, a->ai_addrlen);
if (!remote_addr) {
talloc_free(smb_krb5);
continue;
}
status = socket_connect_ev(smb_krb5->sock, NULL, remote_addr, 0, ev);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(smb_krb5);
continue;
}
/* Setup the FDE, start listening for read events
* from the start (otherwise we may miss a socket
* drop) and mark as AUTOCLOSE along with the fde */
/* Ths is equivilant to EVENT_FD_READABLE(smb_krb5->fde) */
smb_krb5->fde = tevent_add_fd(ev, smb_krb5->sock,
socket_get_fd(smb_krb5->sock),
TEVENT_FD_READ,
smb_krb5_socket_handler, smb_krb5);
/* its now the job of the event layer to close the socket */
tevent_fd_set_close_fn(smb_krb5->fde, socket_tevent_fd_close_fn);
socket_set_flags(smb_krb5->sock, SOCKET_FLAG_NOCLOSE);
tevent_add_timer(ev, smb_krb5,
timeval_current_ofs(timeout, 0),
smb_krb5_request_timeout, smb_krb5);
smb_krb5->status = NT_STATUS_OK;
smb_krb5->reply = data_blob(NULL, 0);
switch (hi->proto) {
case KRB5_KRBHST_UDP:
TEVENT_FD_WRITEABLE(smb_krb5->fde);
smb_krb5->request = send_blob;
break;
case KRB5_KRBHST_TCP:
smb_krb5->packet = packet_init(smb_krb5);
if (smb_krb5->packet == NULL) {
talloc_free(smb_krb5);
return ENOMEM;
}
packet_set_private(smb_krb5->packet, smb_krb5);
packet_set_socket(smb_krb5->packet, smb_krb5->sock);
packet_set_callback(smb_krb5->packet, smb_krb5_full_packet);
packet_set_full_request(smb_krb5->packet, packet_full_request_u32);
packet_set_error_handler(smb_krb5->packet, smb_krb5_error_handler);
packet_set_event_context(smb_krb5->packet, ev);
packet_set_fde(smb_krb5->packet, smb_krb5->fde);
smb_krb5->request = data_blob_talloc(smb_krb5, NULL, send_blob.length + 4);
RSIVAL(smb_krb5->request.data, 0, send_blob.length);
memcpy(smb_krb5->request.data+4, send_blob.data, send_blob.length);
packet_send(smb_krb5->packet, smb_krb5->request);
break;
case KRB5_KRBHST_HTTP:
talloc_free(tmp_ctx);
return EINVAL;
}
while ((NT_STATUS_IS_OK(smb_krb5->status)) && !smb_krb5->reply.length) {
if (tevent_loop_once(ev) != 0) {
talloc_free(tmp_ctx);
return EINVAL;
}
/* After each and every event loop, reset the
* send_to_kdc pointers to what they were when
* we entered this loop. That way, if a
* nested event has invalidated them, we put
* it back before we return to the heimdal
* code */
ret = krb5_set_send_to_kdc_func(context,
smb_krb5_send_and_recv_func,
data);
if (ret != 0) {
talloc_free(tmp_ctx);
return ret;
}
}
if (NT_STATUS_EQUAL(smb_krb5->status, NT_STATUS_IO_TIMEOUT)) {
talloc_free(smb_krb5);
continue;
}
if (!NT_STATUS_IS_OK(smb_krb5->status)) {
struct tsocket_address *addr = socket_address_to_tsocket_address(smb_krb5, remote_addr);
const char *addr_string = NULL;
if (addr) {
addr_string = tsocket_address_inet_addr_string(addr, smb_krb5);
} else {
addr_string = NULL;
}
DEBUG(2,("Error reading smb_krb5 reply packet: %s from %s\n", nt_errstr(smb_krb5->status),
addr_string));
talloc_free(smb_krb5);
continue;
}
ret = krb5_data_copy(recv_buf, smb_krb5->reply.data, smb_krb5->reply.length);
if (ret) {
talloc_free(tmp_ctx);
return ret;
}
talloc_free(smb_krb5);
break;
}
talloc_free(tmp_ctx);
if (a) {
return 0;
}
return KRB5_KDC_UNREACH;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_sendto (krb5_context context,
const krb5_data *send_data,
krb5_krbhst_handle handle,
krb5_data *receive)
{
krb5_error_code ret;
int fd;
int i;
krb5_data_zero(receive);
for (i = 0; i < context->max_retries; ++i) {
krb5_krbhst_info *hi;
while (krb5_krbhst_next(context, handle, &hi) == 0) {
struct addrinfo *ai, *a;
if (context->send_to_kdc) {
struct send_to_kdc *s = context->send_to_kdc;
ret = (*s->func)(context, s->data,
hi, send_data, receive);
if (ret == 0 && receive->length != 0)
goto out;
continue;
}
if(hi->proto == KRB5_KRBHST_HTTP && context->http_proxy) {
if (send_via_proxy (context, hi, send_data, receive) == 0) {
ret = 0;
goto out;
}
continue;
}
ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
if (ret)
continue;
for (a = ai; a != NULL; a = a->ai_next) {
fd = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
if (fd < 0)
continue;
if (connect (fd, a->ai_addr, a->ai_addrlen) < 0) {
close (fd);
continue;
}
switch (hi->proto) {
case KRB5_KRBHST_HTTP :
ret = send_and_recv_http(fd, context->kdc_timeout,
"", send_data, receive);
break;
case KRB5_KRBHST_TCP :
ret = send_and_recv_tcp (fd, context->kdc_timeout,
send_data, receive);
break;
case KRB5_KRBHST_UDP :
ret = send_and_recv_udp (fd, context->kdc_timeout,
send_data, receive);
break;
}
close (fd);
if(ret == 0 && receive->length != 0)
goto out;
}
}
krb5_krbhst_reset(context, handle);
}
krb5_clear_error_string (context);
ret = KRB5_KDC_UNREACH;
out:
return ret;
}
