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samba-mirror/source3/torture/wbc_async.c
Andreas Schneider ba9ad12665 wbclient: Send the client process name talking to winbind
This is for better debugging messages.

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
2018-11-12 09:50:25 +01:00

779 lines
18 KiB
C

/*
Unix SMB/CIFS implementation.
Infrastructure for async winbind requests
Copyright (C) Volker Lendecke 2008
** NOTE! The following LGPL license applies to the wbclient
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "system/filesys.h"
#include "system/network.h"
#include <talloc.h>
#include <tevent.h>
#include "lib/async_req/async_sock.h"
#include "nsswitch/winbind_struct_protocol.h"
#include "nsswitch/libwbclient/wbclient.h"
#include "wbc_async.h"
wbcErr map_wbc_err_from_errno(int error)
{
switch(error) {
case EPERM:
case EACCES:
return WBC_ERR_AUTH_ERROR;
case ENOMEM:
return WBC_ERR_NO_MEMORY;
case EIO:
default:
return WBC_ERR_UNKNOWN_FAILURE;
}
}
bool tevent_req_is_wbcerr(struct tevent_req *req, wbcErr *pwbc_err)
{
enum tevent_req_state state;
uint64_t error;
if (!tevent_req_is_error(req, &state, &error)) {
*pwbc_err = WBC_ERR_SUCCESS;
return false;
}
switch (state) {
case TEVENT_REQ_USER_ERROR:
*pwbc_err = error;
break;
case TEVENT_REQ_TIMED_OUT:
*pwbc_err = WBC_ERR_UNKNOWN_FAILURE;
break;
case TEVENT_REQ_NO_MEMORY:
*pwbc_err = WBC_ERR_NO_MEMORY;
break;
default:
*pwbc_err = WBC_ERR_UNKNOWN_FAILURE;
break;
}
return true;
}
wbcErr tevent_req_simple_recv_wbcerr(struct tevent_req *req)
{
wbcErr wbc_err;
if (tevent_req_is_wbcerr(req, &wbc_err)) {
return wbc_err;
}
return WBC_ERR_SUCCESS;
}
struct wbc_debug_ops {
void (*debug)(void *context, enum wbcDebugLevel level,
const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
void *context;
};
struct wb_context {
struct tevent_queue *queue;
int fd;
bool is_priv;
const char *dir;
struct wbc_debug_ops debug_ops;
};
static int make_nonstd_fd(int fd)
{
size_t i;
int sys_errno = 0;
int fds[3];
size_t 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;
}
/* Just put a prototype to avoid moving the whole function around */
static const char *winbindd_socket_dir(void);
struct wb_context *wb_context_init(TALLOC_CTX *mem_ctx, const char* dir)
{
struct wb_context *result;
result = talloc_zero(mem_ctx, struct wb_context);
if (result == NULL) {
return NULL;
}
result->queue = tevent_queue_create(result, "wb_trans");
if (result->queue == NULL) {
TALLOC_FREE(result);
return NULL;
}
result->fd = -1;
result->is_priv = false;
if (dir != NULL) {
result->dir = talloc_strdup(result, dir);
} else {
result->dir = winbindd_socket_dir();
}
if (result->dir == NULL) {
TALLOC_FREE(result);
return NULL;
}
return result;
}
struct wb_connect_state {
int dummy;
};
static void wbc_connect_connected(struct tevent_req *subreq);
static struct tevent_req *wb_connect_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct wb_context *wb_ctx,
const char *dir)
{
struct tevent_req *result, *subreq;
struct wb_connect_state *state;
struct sockaddr_un sunaddr;
struct stat st;
char *path = NULL;
wbcErr wbc_err;
result = tevent_req_create(mem_ctx, &state, struct wb_connect_state);
if (result == NULL) {
return NULL;
}
if (wb_ctx->fd != -1) {
close(wb_ctx->fd);
wb_ctx->fd = -1;
}
/* Check permissions on unix socket directory */
if (lstat(dir, &st) == -1) {
wbc_err = WBC_ERR_WINBIND_NOT_AVAILABLE;
goto post_status;
}
if (!S_ISDIR(st.st_mode) ||
(st.st_uid != 0 && st.st_uid != geteuid())) {
wbc_err = WBC_ERR_WINBIND_NOT_AVAILABLE;
goto post_status;
}
/* Connect to socket */
path = talloc_asprintf(mem_ctx, "%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())) {
wbc_err = WBC_ERR_WINBIND_NOT_AVAILABLE;
goto post_status;
}
wb_ctx->fd = make_safe_fd(socket(AF_UNIX, SOCK_STREAM, 0));
if (wb_ctx->fd == -1) {
wbc_err = map_wbc_err_from_errno(errno);
goto post_status;
}
subreq = async_connect_send(mem_ctx, ev, wb_ctx->fd,
(struct sockaddr *)(void *)&sunaddr,
sizeof(sunaddr), NULL, NULL, NULL);
if (subreq == NULL) {
goto nomem;
}
tevent_req_set_callback(subreq, wbc_connect_connected, result);
return result;
post_status:
tevent_req_error(result, wbc_err);
return tevent_req_post(result, ev);
nomem:
TALLOC_FREE(result);
return NULL;
}
static void wbc_connect_connected(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
int res, err;
res = async_connect_recv(subreq, &err);
TALLOC_FREE(subreq);
if (res == -1) {
tevent_req_error(req, map_wbc_err_from_errno(err));
return;
}
tevent_req_done(req);
}
static wbcErr wb_connect_recv(struct tevent_req *req)
{
return tevent_req_simple_recv_wbcerr(req);
}
static const char *winbindd_socket_dir(void)
{
if (nss_wrapper_enabled()) {
const char *env_dir;
env_dir = getenv("SELFTEST_WINBINDD_SOCKET_DIR");
if (env_dir != NULL) {
return env_dir;
}
}
return WINBINDD_SOCKET_DIR;
}
struct wb_open_pipe_state {
struct wb_context *wb_ctx;
struct tevent_context *ev;
bool need_priv;
struct winbindd_request wb_req;
};
static void wb_open_pipe_connect_nonpriv_done(struct tevent_req *subreq);
static void wb_open_pipe_ping_done(struct tevent_req *subreq);
static void wb_open_pipe_getpriv_done(struct tevent_req *subreq);
static void wb_open_pipe_connect_priv_done(struct tevent_req *subreq);
static struct tevent_req *wb_open_pipe_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct wb_context *wb_ctx,
bool need_priv)
{
struct tevent_req *result, *subreq;
struct wb_open_pipe_state *state;
result = tevent_req_create(mem_ctx, &state, struct wb_open_pipe_state);
if (result == NULL) {
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, wb_ctx->dir);
if (subreq == NULL) {
goto fail;
}
tevent_req_set_callback(subreq, wb_open_pipe_connect_nonpriv_done,
result);
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
static void wb_open_pipe_connect_nonpriv_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct wb_open_pipe_state *state = tevent_req_data(
req, struct wb_open_pipe_state);
wbcErr wbc_err;
wbc_err = wb_connect_recv(subreq);
TALLOC_FREE(subreq);
if (!WBC_ERROR_IS_OK(wbc_err)) {
state->wb_ctx->is_priv = true;
tevent_req_error(req, wbc_err);
return;
}
ZERO_STRUCT(state->wb_req);
state->wb_req.cmd = WINBINDD_INTERFACE_VERSION;
state->wb_req.pid = getpid();
(void)snprintf(state->wb_req.client_name,
sizeof(state->wb_req.client_name),
"%s",
"TORTURE");
subreq = wb_simple_trans_send(state, state->ev, NULL,
state->wb_ctx->fd, &state->wb_req);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, wb_open_pipe_ping_done, req);
}
static void wb_open_pipe_ping_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct wb_open_pipe_state *state = tevent_req_data(
req, struct wb_open_pipe_state);
struct winbindd_response *wb_resp;
int ret, err;
ret = wb_simple_trans_recv(subreq, state, &wb_resp, &err);
TALLOC_FREE(subreq);
if (ret == -1) {
tevent_req_error(req, map_wbc_err_from_errno(err));
return;
}
if (!state->need_priv) {
tevent_req_done(req);
return;
}
state->wb_req.cmd = WINBINDD_PRIV_PIPE_DIR;
state->wb_req.pid = getpid();
subreq = wb_simple_trans_send(state, state->ev, NULL,
state->wb_ctx->fd, &state->wb_req);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, wb_open_pipe_getpriv_done, req);
}
static void wb_open_pipe_getpriv_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct wb_open_pipe_state *state = tevent_req_data(
req, struct wb_open_pipe_state);
struct winbindd_response *wb_resp = NULL;
int ret, err;
ret = wb_simple_trans_recv(subreq, state, &wb_resp, &err);
TALLOC_FREE(subreq);
if (ret == -1) {
tevent_req_error(req, map_wbc_err_from_errno(err));
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 (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, wb_open_pipe_connect_priv_done, req);
}
static void wb_open_pipe_connect_priv_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct wb_open_pipe_state *state = tevent_req_data(
req, struct wb_open_pipe_state);
wbcErr wbc_err;
wbc_err = wb_connect_recv(subreq);
TALLOC_FREE(subreq);
if (!WBC_ERROR_IS_OK(wbc_err)) {
tevent_req_error(req, wbc_err);
return;
}
state->wb_ctx->is_priv = true;
tevent_req_done(req);
}
static wbcErr wb_open_pipe_recv(struct tevent_req *req)
{
return tevent_req_simple_recv_wbcerr(req);
}
struct wb_trans_state {
struct wb_trans_state *prev, *next;
struct wb_context *wb_ctx;
struct tevent_context *ev;
struct winbindd_request *wb_req;
struct winbindd_response *wb_resp;
bool need_priv;
};
static bool closed_fd(int fd)
{
struct timeval tv;
fd_set r_fds;
int selret;
if (fd == -1) {
return true;
}
FD_ZERO(&r_fds);
FD_SET(fd, &r_fds);
ZERO_STRUCT(tv);
selret = select(fd+1, &r_fds, NULL, NULL, &tv);
if (selret == -1) {
return true;
}
if (selret == 0) {
return false;
}
return (FD_ISSET(fd, &r_fds));
}
static void wb_trans_trigger(struct tevent_req *req, void *private_data);
static void wb_trans_connect_done(struct tevent_req *subreq);
static void wb_trans_done(struct tevent_req *subreq);
static void wb_trans_retry_wait_done(struct tevent_req *subreq);
struct tevent_req *wb_trans_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct wb_context *wb_ctx, bool need_priv,
struct winbindd_request *wb_req)
{
struct tevent_req *req;
struct wb_trans_state *state;
req = tevent_req_create(mem_ctx, &state, struct wb_trans_state);
if (req == NULL) {
return NULL;
}
state->wb_ctx = wb_ctx;
state->ev = ev;
state->wb_req = wb_req;
state->need_priv = need_priv;
if (!tevent_queue_add(wb_ctx->queue, ev, req, wb_trans_trigger,
NULL)) {
tevent_req_oom(req);
return tevent_req_post(req, ev);
}
return req;
}
static void wb_trans_trigger(struct tevent_req *req, void *private_data)
{
struct wb_trans_state *state = tevent_req_data(
req, struct wb_trans_state);
struct tevent_req *subreq;
if ((state->wb_ctx->fd != -1) && closed_fd(state->wb_ctx->fd)) {
close(state->wb_ctx->fd);
state->wb_ctx->fd = -1;
}
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 (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, wb_trans_connect_done, req);
return;
}
state->wb_req->pid = getpid();
subreq = wb_simple_trans_send(state, state->ev, NULL,
state->wb_ctx->fd, state->wb_req);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, wb_trans_done, req);
}
static bool wb_trans_retry(struct tevent_req *req,
struct wb_trans_state *state,
wbcErr wbc_err)
{
struct tevent_req *subreq;
if (WBC_ERROR_IS_OK(wbc_err)) {
return false;
}
if (wbc_err == WBC_ERR_WINBIND_NOT_AVAILABLE) {
/*
* Winbind not around or we can't connect to the pipe. Fail
* immediately.
*/
tevent_req_error(req, wbc_err);
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 = tevent_wakeup_send(state, state->ev,
tevent_timeval_current_ofs(1, 0));
if (tevent_req_nomem(subreq, req)) {
return true;
}
tevent_req_set_callback(subreq, wb_trans_retry_wait_done, req);
return true;
}
static void wb_trans_retry_wait_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct wb_trans_state *state = tevent_req_data(
req, struct wb_trans_state);
bool ret;
ret = tevent_wakeup_recv(subreq);
TALLOC_FREE(subreq);
if (!ret) {
tevent_req_error(req, WBC_ERR_UNKNOWN_FAILURE);
return;
}
subreq = wb_open_pipe_send(state, state->ev, state->wb_ctx,
state->need_priv);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, wb_trans_connect_done, req);
}
static void wb_trans_connect_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct wb_trans_state *state = tevent_req_data(
req, struct wb_trans_state);
wbcErr wbc_err;
wbc_err = wb_open_pipe_recv(subreq);
TALLOC_FREE(subreq);
if (wb_trans_retry(req, state, wbc_err)) {
return;
}
subreq = wb_simple_trans_send(state, state->ev, NULL,
state->wb_ctx->fd, state->wb_req);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, wb_trans_done, req);
}
static void wb_trans_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct wb_trans_state *state = tevent_req_data(
req, struct wb_trans_state);
int ret, err;
ret = wb_simple_trans_recv(subreq, state, &state->wb_resp, &err);
TALLOC_FREE(subreq);
if ((ret == -1)
&& wb_trans_retry(req, state, map_wbc_err_from_errno(err))) {
return;
}
tevent_req_done(req);
}
wbcErr wb_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
struct winbindd_response **presponse)
{
struct wb_trans_state *state = tevent_req_data(
req, struct wb_trans_state);
wbcErr wbc_err;
if (tevent_req_is_wbcerr(req, &wbc_err)) {
return wbc_err;
}
*presponse = talloc_move(mem_ctx, &state->wb_resp);
return WBC_ERR_SUCCESS;
}
/********************************************************************
* Debug wrapper functions, modeled (with lot's of code copied as is)
* after the tevent debug wrapper functions
********************************************************************/
/*
this allows the user to choose their own debug function
*/
int wbcSetDebug(struct wb_context *wb_ctx,
void (*debug)(void *context,
enum wbcDebugLevel level,
const char *fmt,
va_list ap) PRINTF_ATTRIBUTE(3,0),
void *context)
{
wb_ctx->debug_ops.debug = debug;
wb_ctx->debug_ops.context = context;
return 0;
}
/*
debug function for wbcSetDebugStderr
*/
static void wbcDebugStderr(void *private_data,
enum wbcDebugLevel level,
const char *fmt,
va_list ap) PRINTF_ATTRIBUTE(3,0);
static void wbcDebugStderr(void *private_data,
enum wbcDebugLevel level,
const char *fmt, va_list ap)
{
if (level <= WBC_DEBUG_WARNING) {
vfprintf(stderr, fmt, ap);
}
}
/*
convenience function to setup debug messages on stderr
messages of level WBC_DEBUG_WARNING and higher are printed
*/
int wbcSetDebugStderr(struct wb_context *wb_ctx)
{
return wbcSetDebug(wb_ctx, wbcDebugStderr, wb_ctx);
}
/*
* log a message
*
* The default debug action is to ignore debugging messages.
* This is the most appropriate action for a library.
* Applications using the library must decide where to
* redirect debugging messages
*/
void wbcDebug(struct wb_context *wb_ctx, enum wbcDebugLevel level,
const char *fmt, ...)
{
va_list ap;
if (!wb_ctx) {
return;
}
if (wb_ctx->debug_ops.debug == NULL) {
return;
}
va_start(ap, fmt);
wb_ctx->debug_ops.debug(wb_ctx->debug_ops.context, level, fmt, ap);
va_end(ap);
}