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samba-mirror/source3/lib/wbclient.c

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17 KiB
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/*
Unix SMB/CIFS implementation.
Infrastructure for async winbind requests
Copyright (C) Volker Lendecke 2008
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "winbindd/winbindd.h"
#include "winbindd/winbindd_proto.h"
static int make_nonstd_fd(int fd)
{
int i;
int sys_errno = 0;
int fds[3];
int num_fds = 0;
if (fd == -1) {
return -1;
}
while (fd < 3) {
fds[num_fds++] = fd;
fd = dup(fd);
if (fd == -1) {
sys_errno = errno;
break;
}
}
for (i=0; i<num_fds; i++) {
close(fds[i]);
}
if (fd == -1) {
errno = sys_errno;
}
return fd;
}
/****************************************************************************
Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
else
if SYSV use O_NDELAY
if BSD use FNDELAY
Set close on exec also.
****************************************************************************/
static int make_safe_fd(int fd)
{
int result, flags;
int new_fd = make_nonstd_fd(fd);
if (new_fd == -1) {
goto fail;
}
/* Socket should be nonblocking. */
#ifdef O_NONBLOCK
#define FLAG_TO_SET O_NONBLOCK
#else
#ifdef SYSV
#define FLAG_TO_SET O_NDELAY
#else /* BSD */
#define FLAG_TO_SET FNDELAY
#endif
#endif
if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
goto fail;
}
flags |= FLAG_TO_SET;
if (fcntl(new_fd, F_SETFL, flags) == -1) {
goto fail;
}
#undef FLAG_TO_SET
/* Socket should be closed on exec() */
#ifdef FD_CLOEXEC
result = flags = fcntl(new_fd, F_GETFD, 0);
if (flags >= 0) {
flags |= FD_CLOEXEC;
result = fcntl( new_fd, F_SETFD, flags );
}
if (result < 0) {
goto fail;
}
#endif
return new_fd;
fail:
if (new_fd != -1) {
int sys_errno = errno;
close(new_fd);
errno = sys_errno;
}
return -1;
}
static bool winbind_closed_fd(int fd)
{
struct timeval tv;
fd_set r_fds;
if (fd == -1) {
return true;
}
FD_ZERO(&r_fds);
FD_SET(fd, &r_fds);
ZERO_STRUCT(tv);
if ((select(fd+1, &r_fds, NULL, NULL, &tv) == -1)
|| FD_ISSET(fd, &r_fds)) {
return true;
}
return false;
}
struct wb_context {
struct async_req_queue *queue;
int fd;
bool is_priv;
};
struct wb_context *wb_context_init(TALLOC_CTX *mem_ctx)
{
struct wb_context *result;
result = talloc(mem_ctx, struct wb_context);
if (result == NULL) {
return NULL;
}
result->queue = async_req_queue_init(result);
if (result->queue == NULL) {
TALLOC_FREE(result);
return NULL;
}
result->fd = -1;
return result;
}
static struct async_req *wb_connect_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct wb_context *wb_ctx,
const char *dir)
{
struct async_req *req;
struct sockaddr_un sunaddr;
struct stat st;
char *path = NULL;
NTSTATUS status;
if (wb_ctx->fd != -1) {
close(wb_ctx->fd);
wb_ctx->fd = -1;
}
/* Check permissions on unix socket directory */
if (lstat(dir, &st) == -1) {
status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
goto post_status;
}
if (!S_ISDIR(st.st_mode) ||
(st.st_uid != 0 && st.st_uid != geteuid())) {
status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
goto post_status;
}
/* Connect to socket */
path = talloc_asprintf(talloc_tos(), "%s/%s", dir,
WINBINDD_SOCKET_NAME);
if (path == NULL) {
goto nomem;
}
sunaddr.sun_family = AF_UNIX;
strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
TALLOC_FREE(path);
/* If socket file doesn't exist, don't bother trying to connect
with retry. This is an attempt to make the system usable when
the winbindd daemon is not running. */
if ((lstat(sunaddr.sun_path, &st) == -1)
|| !S_ISSOCK(st.st_mode)
|| (st.st_uid != 0 && st.st_uid != geteuid())) {
status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
goto post_status;
}
wb_ctx->fd = make_safe_fd(socket(AF_UNIX, SOCK_STREAM, 0));
if (wb_ctx->fd == -1) {
status = map_nt_error_from_unix(errno);
goto post_status;
}
req = async_connect_send(mem_ctx, ev, wb_ctx->fd,
(struct sockaddr *)&sunaddr,
sizeof(sunaddr));
if (req == NULL) {
goto nomem;
}
if (!async_req_set_timeout(req, ev, timeval_set(30, 0))) {
TALLOC_FREE(req);
goto nomem;
}
return req;
nomem:
status = NT_STATUS_NO_MEMORY;
post_status:
req = async_req_new(mem_ctx);
if (req == NULL) {
return NULL;
}
if (async_post_ntstatus(req, ev, status)) {
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return req;
}
TALLOC_FREE(req);
return NULL;
}
static NTSTATUS wb_connect_recv(struct async_req *req)
{
int dummy;
return async_connect_recv(req, &dummy);
}
static struct winbindd_request *winbindd_request_copy(
TALLOC_CTX *mem_ctx,
const struct winbindd_request *req)
{
struct winbindd_request *result;
result = (struct winbindd_request *)TALLOC_MEMDUP(
mem_ctx, req, sizeof(struct winbindd_request));
if (result == NULL) {
return NULL;
}
if (result->extra_len == 0) {
return result;
}
result->extra_data.data = (char *)TALLOC_MEMDUP(
result, result->extra_data.data, result->extra_len);
if (result->extra_data.data == NULL) {
TALLOC_FREE(result);
return NULL;
}
return result;
}
struct wb_int_trans_state {
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struct tevent_context *ev;
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int fd;
struct winbindd_request *wb_req;
struct winbindd_response *wb_resp;
};
static void wb_int_trans_write_done(struct async_req *subreq);
static void wb_int_trans_read_done(struct async_req *subreq);
static struct async_req *wb_int_trans_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev, int fd,
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struct winbindd_request *wb_req)
{
struct async_req *result;
struct async_req *subreq;
struct wb_int_trans_state *state;
if (!async_req_setup(mem_ctx, &result, &state,
struct wb_int_trans_state)) {
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return NULL;
}
if (winbind_closed_fd(fd)) {
if (!async_post_ntstatus(result, ev,
NT_STATUS_PIPE_DISCONNECTED)) {
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goto fail;
}
return result;
}
state->ev = ev;
state->fd = fd;
state->wb_req = wb_req;
state->wb_req->length = sizeof(struct winbindd_request);
state->wb_req->pid = getpid();
subreq = wb_req_write_send(state, state->ev, state->fd, state->wb_req);
if (subreq == NULL) {
goto fail;
}
subreq->async.fn = wb_int_trans_write_done;
subreq->async.priv = result;
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
static void wb_int_trans_write_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct wb_int_trans_state *state = talloc_get_type_abort(
req->private_data, struct wb_int_trans_state);
NTSTATUS status;
status = wb_req_write_recv(subreq);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
async_req_nterror(req, status);
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return;
}
subreq = wb_resp_read_send(state, state->ev, state->fd);
if (subreq == NULL) {
async_req_nterror(req, NT_STATUS_NO_MEMORY);
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}
subreq->async.fn = wb_int_trans_read_done;
subreq->async.priv = req;
}
static void wb_int_trans_read_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct wb_int_trans_state *state = talloc_get_type_abort(
req->private_data, struct wb_int_trans_state);
NTSTATUS status;
status = wb_resp_read_recv(subreq, state, &state->wb_resp);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
async_req_nterror(req, status);
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return;
}
async_req_done(req);
}
static NTSTATUS wb_int_trans_recv(struct async_req *req,
TALLOC_CTX *mem_ctx,
struct winbindd_response **presponse)
{
struct wb_int_trans_state *state = talloc_get_type_abort(
req->private_data, struct wb_int_trans_state);
NTSTATUS status;
if (async_req_is_nterror(req, &status)) {
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return status;
}
*presponse = talloc_move(mem_ctx, &state->wb_resp);
return NT_STATUS_OK;
}
static const char *winbindd_socket_dir(void)
{
#ifdef SOCKET_WRAPPER
const char *env_dir;
env_dir = getenv(WINBINDD_SOCKET_DIR_ENVVAR);
if (env_dir) {
return env_dir;
}
#endif
return WINBINDD_SOCKET_DIR;
}
struct wb_open_pipe_state {
struct wb_context *wb_ctx;
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struct tevent_context *ev;
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bool need_priv;
struct winbindd_request wb_req;
};
static void wb_open_pipe_connect_nonpriv_done(struct async_req *subreq);
static void wb_open_pipe_ping_done(struct async_req *subreq);
static void wb_open_pipe_getpriv_done(struct async_req *subreq);
static void wb_open_pipe_connect_priv_done(struct async_req *subreq);
static struct async_req *wb_open_pipe_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct wb_context *wb_ctx,
bool need_priv)
{
struct async_req *result;
struct async_req *subreq;
struct wb_open_pipe_state *state;
if (!async_req_setup(mem_ctx, &result, &state,
struct wb_open_pipe_state)) {
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return NULL;
}
state->wb_ctx = wb_ctx;
state->ev = ev;
state->need_priv = need_priv;
if (wb_ctx->fd != -1) {
close(wb_ctx->fd);
wb_ctx->fd = -1;
}
subreq = wb_connect_send(state, ev, wb_ctx, winbindd_socket_dir());
if (subreq == NULL) {
goto fail;
}
subreq->async.fn = wb_open_pipe_connect_nonpriv_done;
subreq->async.priv = result;
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
static void wb_open_pipe_connect_nonpriv_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct wb_open_pipe_state *state = talloc_get_type_abort(
req->private_data, struct wb_open_pipe_state);
NTSTATUS status;
status = wb_connect_recv(subreq);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
state->wb_ctx->is_priv = true;
async_req_nterror(req, status);
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return;
}
ZERO_STRUCT(state->wb_req);
state->wb_req.cmd = WINBINDD_INTERFACE_VERSION;
subreq = wb_int_trans_send(state, state->ev, state->wb_ctx->fd,
&state->wb_req);
if (async_req_nomem(subreq, req)) {
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return;
}
subreq->async.fn = wb_open_pipe_ping_done;
subreq->async.priv = req;
}
static void wb_open_pipe_ping_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct wb_open_pipe_state *state = talloc_get_type_abort(
req->private_data, struct wb_open_pipe_state);
struct winbindd_response *wb_resp;
NTSTATUS status;
status = wb_int_trans_recv(subreq, state, &wb_resp);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
async_req_nterror(req, status);
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return;
}
if (!state->need_priv) {
async_req_done(req);
return;
}
state->wb_req.cmd = WINBINDD_PRIV_PIPE_DIR;
subreq = wb_int_trans_send(state, state->ev, state->wb_ctx->fd,
&state->wb_req);
if (async_req_nomem(subreq, req)) {
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return;
}
subreq->async.fn = wb_open_pipe_getpriv_done;
subreq->async.priv = req;
}
static void wb_open_pipe_getpriv_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct wb_open_pipe_state *state = talloc_get_type_abort(
req->private_data, struct wb_open_pipe_state);
struct winbindd_response *wb_resp = NULL;
NTSTATUS status;
status = wb_int_trans_recv(subreq, state, &wb_resp);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
async_req_nterror(req, status);
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return;
}
close(state->wb_ctx->fd);
state->wb_ctx->fd = -1;
subreq = wb_connect_send(state, state->ev, state->wb_ctx,
(char *)wb_resp->extra_data.data);
TALLOC_FREE(wb_resp);
if (async_req_nomem(subreq, req)) {
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return;
}
subreq->async.fn = wb_open_pipe_connect_priv_done;
subreq->async.priv = req;
}
static void wb_open_pipe_connect_priv_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct wb_open_pipe_state *state = talloc_get_type_abort(
req->private_data, struct wb_open_pipe_state);
NTSTATUS status;
status = wb_connect_recv(subreq);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
async_req_nterror(req, status);
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return;
}
state->wb_ctx->is_priv = true;
async_req_done(req);
}
static NTSTATUS wb_open_pipe_recv(struct async_req *req)
{
return async_req_simple_recv_ntstatus(req);
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}
struct wb_trans_state {
struct wb_trans_state *prev, *next;
struct wb_context *wb_ctx;
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struct tevent_context *ev;
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struct winbindd_request *wb_req;
struct winbindd_response *wb_resp;
int num_retries;
bool need_priv;
};
static void wb_trans_connect_done(struct async_req *subreq);
static void wb_trans_done(struct async_req *subreq);
static void wb_trans_retry_wait_done(struct async_req *subreq);
static void wb_trigger_trans(struct async_req *req)
{
struct wb_trans_state *state = talloc_get_type_abort(
req->private_data, struct wb_trans_state);
struct async_req *subreq;
if ((state->wb_ctx->fd == -1)
|| (state->need_priv && !state->wb_ctx->is_priv)) {
subreq = wb_open_pipe_send(state, state->ev, state->wb_ctx,
state->need_priv);
if (async_req_nomem(subreq, req)) {
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return;
}
subreq->async.fn = wb_trans_connect_done;
subreq->async.priv = req;
return;
}
subreq = wb_int_trans_send(state, state->ev, state->wb_ctx->fd,
state->wb_req);
if (async_req_nomem(subreq, req)) {
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return;
}
subreq->async.fn = wb_trans_done;
subreq->async.priv = req;
}
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struct async_req *wb_trans_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
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struct wb_context *wb_ctx, bool need_priv,
const struct winbindd_request *wb_req)
{
struct async_req *result;
struct wb_trans_state *state;
if (!async_req_setup(mem_ctx, &result, &state,
struct wb_trans_state)) {
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return NULL;
}
state->wb_ctx = wb_ctx;
state->ev = ev;
state->wb_req = winbindd_request_copy(state, wb_req);
if (state->wb_req == NULL) {
goto fail;
}
state->num_retries = 10;
state->need_priv = need_priv;
if (!async_req_enqueue(wb_ctx->queue, ev, result, wb_trigger_trans)) {
goto fail;
}
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
static bool wb_trans_retry(struct async_req *req,
struct wb_trans_state *state,
NTSTATUS status)
{
struct async_req *subreq;
if (NT_STATUS_IS_OK(status)) {
return false;
}
if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)
|| NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
/*
* Winbind not around or we can't connect to the pipe. Fail
* immediately.
*/
async_req_nterror(req, status);
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return true;
}
state->num_retries -= 1;
if (state->num_retries == 0) {
async_req_nterror(req, status);
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return true;
}
/*
* The transfer as such failed, retry after one second
*/
if (state->wb_ctx->fd != -1) {
close(state->wb_ctx->fd);
state->wb_ctx->fd = -1;
}
subreq = async_wait_send(state, state->ev, timeval_set(1, 0));
if (async_req_nomem(subreq, req)) {
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return true;
}
subreq->async.fn = wb_trans_retry_wait_done;
subreq->async.priv = req;
return true;
}
static void wb_trans_retry_wait_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct wb_trans_state *state = talloc_get_type_abort(
req->private_data, struct wb_trans_state);
bool ret;
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ret = async_wait_recv(subreq);
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TALLOC_FREE(subreq);
if (ret) {
async_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
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return;
}
subreq = wb_open_pipe_send(state, state->ev, state->wb_ctx,
state->need_priv);
if (async_req_nomem(subreq, req)) {
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return;
}
subreq->async.fn = wb_trans_connect_done;
subreq->async.priv = req;
}
static void wb_trans_connect_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct wb_trans_state *state = talloc_get_type_abort(
req->private_data, struct wb_trans_state);
NTSTATUS status;
status = wb_open_pipe_recv(subreq);
TALLOC_FREE(subreq);
if (wb_trans_retry(req, state, status)) {
return;
}
subreq = wb_int_trans_send(state, state->ev, state->wb_ctx->fd,
state->wb_req);
if (async_req_nomem(subreq, req)) {
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return;
}
subreq->async.fn = wb_trans_done;
subreq->async.priv = req;
}
static void wb_trans_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct wb_trans_state *state = talloc_get_type_abort(
req->private_data, struct wb_trans_state);
NTSTATUS status;
status = wb_int_trans_recv(subreq, state, &state->wb_resp);
TALLOC_FREE(subreq);
if (wb_trans_retry(req, state, status)) {
return;
}
async_req_done(req);
}
NTSTATUS wb_trans_recv(struct async_req *req, TALLOC_CTX *mem_ctx,
struct winbindd_response **presponse)
{
struct wb_trans_state *state = talloc_get_type_abort(
req->private_data, struct wb_trans_state);
NTSTATUS status;
if (async_req_is_nterror(req, &status)) {
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return status;
}
*presponse = talloc_move(mem_ctx, &state->wb_resp);
return NT_STATUS_OK;
}