mirror of
https://github.com/samba-team/samba.git
synced 2024-12-23 17:34:34 +03:00
e674581416
(This used to be commit 20c5f042e3
)
395 lines
8.0 KiB
C
395 lines
8.0 KiB
C
/*
|
|
Unix SMB/Netbios implementation.
|
|
Version 2.0
|
|
|
|
winbind client common code
|
|
|
|
Copyright (C) Tim Potter 2000
|
|
Copyright (C) Andrew Tridgell 2000
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 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 Library General Public
|
|
License along with this library; if not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include "winbind_nss_config.h"
|
|
#include "winbindd_nss.h"
|
|
|
|
/* Global variables. These are effectively the client state information */
|
|
|
|
int winbindd_fd = -1; /* fd for winbindd socket */
|
|
static char *excluded_domain;
|
|
|
|
/* Free a response structure */
|
|
|
|
void free_response(struct winbindd_response *response)
|
|
{
|
|
/* Free any allocated extra_data */
|
|
|
|
if (response)
|
|
SAFE_FREE(response->extra_data);
|
|
}
|
|
|
|
/*
|
|
smbd needs to be able to exclude lookups for its own domain
|
|
*/
|
|
void winbind_exclude_domain(const char *domain)
|
|
{
|
|
SAFE_FREE(excluded_domain);
|
|
excluded_domain = strdup(domain);
|
|
}
|
|
|
|
|
|
/* Initialise a request structure */
|
|
|
|
void init_request(struct winbindd_request *request, int request_type)
|
|
{
|
|
static char *domain_env;
|
|
static BOOL initialised;
|
|
|
|
request->cmd = (enum winbindd_cmd)request_type;
|
|
request->pid = getpid();
|
|
request->domain[0] = '\0';
|
|
|
|
if (!initialised) {
|
|
initialised = True;
|
|
domain_env = getenv(WINBINDD_DOMAIN_ENV);
|
|
}
|
|
|
|
if (domain_env) {
|
|
strncpy(request->domain, domain_env,
|
|
sizeof(request->domain) - 1);
|
|
request->domain[sizeof(request->domain) - 1] = '\0';
|
|
}
|
|
}
|
|
|
|
/* Initialise a response structure */
|
|
|
|
void init_response(struct winbindd_response *response)
|
|
{
|
|
/* Initialise return value */
|
|
|
|
response->result = WINBINDD_ERROR;
|
|
}
|
|
|
|
/* Close established socket */
|
|
|
|
void close_sock(void)
|
|
{
|
|
if (winbindd_fd != -1) {
|
|
close(winbindd_fd);
|
|
winbindd_fd = -1;
|
|
}
|
|
}
|
|
|
|
/* Connect to winbindd socket */
|
|
|
|
int winbind_open_pipe_sock(void)
|
|
{
|
|
struct sockaddr_un sunaddr;
|
|
static pid_t our_pid;
|
|
struct stat st;
|
|
pstring path;
|
|
|
|
if (our_pid != getpid()) {
|
|
close_sock();
|
|
our_pid = getpid();
|
|
}
|
|
|
|
if (winbindd_fd != -1) {
|
|
return winbindd_fd;
|
|
}
|
|
|
|
/* Check permissions on unix socket directory */
|
|
|
|
if (lstat(WINBINDD_SOCKET_DIR, &st) == -1) {
|
|
return -1;
|
|
}
|
|
|
|
if (!S_ISDIR(st.st_mode) ||
|
|
(st.st_uid != 0 && st.st_uid != geteuid())) {
|
|
return -1;
|
|
}
|
|
|
|
/* Connect to socket */
|
|
|
|
strncpy(path, WINBINDD_SOCKET_DIR, sizeof(path) - 1);
|
|
path[sizeof(path) - 1] = '\0';
|
|
|
|
strncat(path, "/", sizeof(path) - 1);
|
|
path[sizeof(path) - 1] = '\0';
|
|
|
|
strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1);
|
|
path[sizeof(path) - 1] = '\0';
|
|
|
|
ZERO_STRUCT(sunaddr);
|
|
sunaddr.sun_family = AF_UNIX;
|
|
strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
|
|
|
|
/* 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(path, &st) == -1) {
|
|
return -1;
|
|
}
|
|
|
|
/* Check permissions on unix socket file */
|
|
|
|
if (!S_ISSOCK(st.st_mode) ||
|
|
(st.st_uid != 0 && st.st_uid != geteuid())) {
|
|
return -1;
|
|
}
|
|
|
|
/* Connect to socket */
|
|
|
|
if ((winbindd_fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
|
|
return -1;
|
|
}
|
|
|
|
if (connect(winbindd_fd, (struct sockaddr *)&sunaddr,
|
|
sizeof(sunaddr)) == -1) {
|
|
close_sock();
|
|
return -1;
|
|
}
|
|
|
|
return winbindd_fd;
|
|
}
|
|
|
|
/* Write data to winbindd socket with timeout */
|
|
|
|
int write_sock(void *buffer, int count)
|
|
{
|
|
int result, nwritten;
|
|
|
|
/* Open connection to winbind daemon */
|
|
|
|
restart:
|
|
|
|
if (winbind_open_pipe_sock() == -1) {
|
|
return -1;
|
|
}
|
|
|
|
/* Write data to socket */
|
|
|
|
nwritten = 0;
|
|
|
|
while(nwritten < count) {
|
|
struct timeval tv;
|
|
fd_set r_fds;
|
|
|
|
/* Catch pipe close on other end by checking if a read()
|
|
call would not block by calling select(). */
|
|
|
|
FD_ZERO(&r_fds);
|
|
FD_SET(winbindd_fd, &r_fds);
|
|
ZERO_STRUCT(tv);
|
|
|
|
if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
|
|
close_sock();
|
|
return -1; /* Select error */
|
|
}
|
|
|
|
/* Write should be OK if fd not available for reading */
|
|
|
|
if (!FD_ISSET(winbindd_fd, &r_fds)) {
|
|
|
|
/* Do the write */
|
|
|
|
result = write(winbindd_fd,
|
|
(char *)buffer + nwritten,
|
|
count - nwritten);
|
|
|
|
if ((result == -1) || (result == 0)) {
|
|
|
|
/* Write failed */
|
|
|
|
close_sock();
|
|
return -1;
|
|
}
|
|
|
|
nwritten += result;
|
|
|
|
} else {
|
|
|
|
/* Pipe has closed on remote end */
|
|
|
|
close_sock();
|
|
goto restart;
|
|
}
|
|
}
|
|
|
|
return nwritten;
|
|
}
|
|
|
|
/* Read data from winbindd socket with timeout */
|
|
|
|
static int read_sock(void *buffer, int count)
|
|
{
|
|
int result = 0, nread = 0;
|
|
|
|
/* Read data from socket */
|
|
|
|
while(nread < count) {
|
|
|
|
result = read(winbindd_fd, (char *)buffer + nread,
|
|
count - nread);
|
|
|
|
if ((result == -1) || (result == 0)) {
|
|
|
|
/* Read failed. I think the only useful thing we
|
|
can do here is just return -1 and fail since the
|
|
transaction has failed half way through. */
|
|
|
|
close_sock();
|
|
return -1;
|
|
}
|
|
|
|
nread += result;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Read reply */
|
|
|
|
int read_reply(struct winbindd_response *response)
|
|
{
|
|
int result1, result2 = 0;
|
|
|
|
if (!response) {
|
|
return -1;
|
|
}
|
|
|
|
/* Read fixed length response */
|
|
|
|
if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
|
|
== -1) {
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* We actually send the pointer value of the extra_data field from
|
|
the server. This has no meaning in the client's address space
|
|
so we clear it out. */
|
|
|
|
response->extra_data = NULL;
|
|
|
|
/* Read variable length response */
|
|
|
|
if (response->length > sizeof(struct winbindd_response)) {
|
|
int extra_data_len = response->length -
|
|
sizeof(struct winbindd_response);
|
|
|
|
/* Mallocate memory for extra data */
|
|
|
|
if (!(response->extra_data = malloc(extra_data_len))) {
|
|
return -1;
|
|
}
|
|
|
|
if ((result2 = read_sock(response->extra_data, extra_data_len))
|
|
== -1) {
|
|
free_response(response);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Return total amount of data read */
|
|
|
|
return result1 + result2;
|
|
}
|
|
|
|
/*
|
|
* send simple types of requests
|
|
*/
|
|
|
|
NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
|
|
{
|
|
struct winbindd_request lrequest;
|
|
|
|
/* Check for our tricky environment variable */
|
|
|
|
if (getenv(WINBINDD_DONT_ENV)) {
|
|
return NSS_STATUS_NOTFOUND;
|
|
}
|
|
|
|
/* smbd may have excluded this domain */
|
|
if (excluded_domain &&
|
|
strcasecmp(excluded_domain, request->domain) == 0) {
|
|
return NSS_STATUS_NOTFOUND;
|
|
}
|
|
|
|
if (!request) {
|
|
ZERO_STRUCT(lrequest);
|
|
request = &lrequest;
|
|
}
|
|
|
|
/* Fill in request and send down pipe */
|
|
|
|
init_request(request, req_type);
|
|
|
|
if (write_sock(request, sizeof(*request)) == -1) {
|
|
return NSS_STATUS_UNAVAIL;
|
|
}
|
|
|
|
return NSS_STATUS_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Get results from winbindd request
|
|
*/
|
|
|
|
NSS_STATUS winbindd_get_response(struct winbindd_response *response)
|
|
{
|
|
struct winbindd_response lresponse;
|
|
|
|
if (!response) {
|
|
ZERO_STRUCT(lresponse);
|
|
response = &lresponse;
|
|
}
|
|
|
|
init_response(response);
|
|
|
|
/* Wait for reply */
|
|
if (read_reply(response) == -1) {
|
|
return NSS_STATUS_UNAVAIL;
|
|
}
|
|
|
|
/* Throw away extra data if client didn't request it */
|
|
if (response == &lresponse) {
|
|
free_response(response);
|
|
}
|
|
|
|
/* Copy reply data from socket */
|
|
if (response->result != WINBINDD_OK) {
|
|
return NSS_STATUS_NOTFOUND;
|
|
}
|
|
|
|
return NSS_STATUS_SUCCESS;
|
|
}
|
|
|
|
/* Handle simple types of requests */
|
|
|
|
NSS_STATUS winbindd_request(int req_type,
|
|
struct winbindd_request *request,
|
|
struct winbindd_response *response)
|
|
{
|
|
NSS_STATUS status;
|
|
|
|
status = winbindd_send_request(req_type, request);
|
|
if (status != NSS_STATUS_SUCCESS)
|
|
return(status);
|
|
return winbindd_get_response(response);
|
|
}
|