mirror of
https://github.com/samba-team/samba.git
synced 2024-12-23 17:34:34 +03:00
1d8cd8faf6
we now have to check the value for _NO_WINBINDD.
"1" enables, and != "1" disables (use "0" by convention).
(This used to be commit 11eccaef1d
)
471 lines
9.4 KiB
C
471 lines
9.4 KiB
C
/*
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Unix SMB/CIFS implementation.
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winbind client common code
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Copyright (C) Tim Potter 2000
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Copyright (C) Andrew Tridgell 2000
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Copyright (C) Andrew Bartlett 2002
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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*/
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#include "winbind_client.h"
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/* Global variables. These are effectively the client state information */
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int winbindd_fd = -1; /* fd for winbindd socket */
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/* Free a response structure */
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void free_response(struct winbindd_response *response)
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{
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/* Free any allocated extra_data */
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if (response)
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SAFE_FREE(response->extra_data);
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}
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/* Initialise a request structure */
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void init_request(struct winbindd_request *request, int request_type)
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{
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request->length = sizeof(struct winbindd_request);
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request->cmd = (enum winbindd_cmd)request_type;
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request->pid = getpid();
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}
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/* Initialise a response structure */
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void init_response(struct winbindd_response *response)
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{
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/* Initialise return value */
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response->result = WINBINDD_ERROR;
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}
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/* Close established socket */
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void close_sock(void)
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{
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if (winbindd_fd != -1) {
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close(winbindd_fd);
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winbindd_fd = -1;
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}
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}
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/* Make sure socket handle isn't stdin, stdout or stderr */
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#define RECURSION_LIMIT 3
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static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
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{
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int new_fd;
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if (fd >= 0 && fd <= 2) {
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#ifdef F_DUPFD
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if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
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return -1;
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}
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/* Parinoia */
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if (new_fd < 3) {
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close(new_fd);
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return -1;
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}
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close(fd);
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return new_fd;
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#else
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if (limit <= 0)
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return -1;
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new_fd = dup(fd);
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if (new_fd == -1)
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return -1;
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/* use the program stack to hold our list of FDs to close */
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new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
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close(fd);
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return new_fd;
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#endif
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}
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return fd;
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}
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static int make_safe_fd(int fd)
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{
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int result, flags;
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int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
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if (new_fd == -1) {
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close(fd);
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return -1;
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}
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/* Socket should be closed on exec() */
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#ifdef FD_CLOEXEC
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result = flags = fcntl(new_fd, F_GETFD, 0);
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if (flags >= 0) {
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flags |= FD_CLOEXEC;
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result = fcntl( new_fd, F_SETFD, flags );
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}
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if (result < 0) {
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close(new_fd);
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return -1;
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}
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#endif
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return new_fd;
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}
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/* Connect to winbindd socket */
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static int winbind_named_pipe_sock(const char *dir)
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{
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struct sockaddr_un sunaddr;
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struct stat st;
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pstring path;
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int fd;
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/* Check permissions on unix socket directory */
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if (lstat(dir, &st) == -1) {
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return -1;
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}
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if (!S_ISDIR(st.st_mode) ||
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(st.st_uid != 0 && st.st_uid != geteuid())) {
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return -1;
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}
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/* Connect to socket */
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strncpy(path, dir, sizeof(path) - 1);
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path[sizeof(path) - 1] = '\0';
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strncat(path, "/", sizeof(path) - 1 - strlen(path));
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path[sizeof(path) - 1] = '\0';
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strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1 - strlen(path));
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path[sizeof(path) - 1] = '\0';
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ZERO_STRUCT(sunaddr);
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sunaddr.sun_family = AF_UNIX;
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strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
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/* If socket file doesn't exist, don't bother trying to connect
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with retry. This is an attempt to make the system usable when
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the winbindd daemon is not running. */
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if (lstat(path, &st) == -1) {
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return -1;
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}
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/* Check permissions on unix socket file */
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if (!S_ISSOCK(st.st_mode) ||
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(st.st_uid != 0 && st.st_uid != geteuid())) {
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return -1;
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}
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/* Connect to socket */
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if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
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return -1;
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}
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if ((fd = make_safe_fd( fd)) == -1) {
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return fd;
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}
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if (connect(fd, (struct sockaddr *)&sunaddr,
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sizeof(sunaddr)) == -1) {
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close(fd);
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return -1;
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}
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return fd;
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}
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/* Connect to winbindd socket */
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int winbind_open_pipe_sock(void)
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{
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#ifdef HAVE_UNIXSOCKET
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static pid_t our_pid;
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struct winbindd_request request;
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struct winbindd_response response;
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ZERO_STRUCT(request);
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ZERO_STRUCT(response);
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if (our_pid != getpid()) {
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close_sock();
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our_pid = getpid();
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}
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if (winbindd_fd != -1) {
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return winbindd_fd;
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}
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if ((winbindd_fd = winbind_named_pipe_sock(WINBINDD_SOCKET_DIR)) == -1) {
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return -1;
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}
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/* version-check the socket */
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if ((winbindd_request(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
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close_sock();
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return -1;
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}
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/* try and get priv pipe */
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if (winbindd_request(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
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int fd;
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if ((fd = winbind_named_pipe_sock(response.extra_data)) != -1) {
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close(winbindd_fd);
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winbindd_fd = fd;
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}
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}
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return winbindd_fd;
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#else
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return -1;
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#endif /* HAVE_UNIXSOCKET */
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}
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/* Write data to winbindd socket */
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int write_sock(void *buffer, int count)
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{
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int result, nwritten;
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/* Open connection to winbind daemon */
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restart:
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if (winbind_open_pipe_sock() == -1) {
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return -1;
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}
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/* Write data to socket */
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nwritten = 0;
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while(nwritten < count) {
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struct timeval tv;
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fd_set r_fds;
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/* Catch pipe close on other end by checking if a read()
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call would not block by calling select(). */
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FD_ZERO(&r_fds);
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FD_SET(winbindd_fd, &r_fds);
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ZERO_STRUCT(tv);
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if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
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close_sock();
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return -1; /* Select error */
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}
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/* Write should be OK if fd not available for reading */
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if (!FD_ISSET(winbindd_fd, &r_fds)) {
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/* Do the write */
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result = write(winbindd_fd,
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(char *)buffer + nwritten,
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count - nwritten);
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if ((result == -1) || (result == 0)) {
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/* Write failed */
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close_sock();
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return -1;
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}
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nwritten += result;
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} else {
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/* Pipe has closed on remote end */
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close_sock();
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goto restart;
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}
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}
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return nwritten;
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}
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/* Read data from winbindd socket */
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static int read_sock(void *buffer, int count)
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{
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int result = 0, nread = 0;
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/* Read data from socket */
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while(nread < count) {
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result = read(winbindd_fd, (char *)buffer + nread,
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count - nread);
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if ((result == -1) || (result == 0)) {
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/* Read failed. I think the only useful thing we
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can do here is just return -1 and fail since the
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transaction has failed half way through. */
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close_sock();
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return -1;
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}
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nread += result;
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}
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return result;
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}
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/* Read reply */
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int read_reply(struct winbindd_response *response)
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{
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int result1, result2 = 0;
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if (!response) {
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return -1;
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}
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/* Read fixed length response */
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if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
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== -1) {
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return -1;
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}
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/* We actually send the pointer value of the extra_data field from
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the server. This has no meaning in the client's address space
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so we clear it out. */
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response->extra_data = NULL;
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/* Read variable length response */
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if (response->length > sizeof(struct winbindd_response)) {
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int extra_data_len = response->length -
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sizeof(struct winbindd_response);
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/* Mallocate memory for extra data */
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if (!(response->extra_data = malloc(extra_data_len))) {
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return -1;
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}
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if ((result2 = read_sock(response->extra_data, extra_data_len))
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== -1) {
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free_response(response);
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return -1;
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}
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}
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/* Return total amount of data read */
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return result1 + result2;
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}
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/*
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* send simple types of requests
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*/
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NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
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{
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struct winbindd_request lrequest;
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char *env;
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int value;
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/* Check for our tricky environment variable */
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if ( (env = getenv(WINBINDD_DONT_ENV)) != NULL ) {
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value = atoi(env);
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if ( value == 1 )
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return NSS_STATUS_NOTFOUND;
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}
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if (!request) {
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ZERO_STRUCT(lrequest);
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request = &lrequest;
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}
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/* Fill in request and send down pipe */
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init_request(request, req_type);
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if (write_sock(request, sizeof(*request)) == -1) {
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return NSS_STATUS_UNAVAIL;
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}
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return NSS_STATUS_SUCCESS;
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}
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/*
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* Get results from winbindd request
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*/
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NSS_STATUS winbindd_get_response(struct winbindd_response *response)
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{
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struct winbindd_response lresponse;
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if (!response) {
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ZERO_STRUCT(lresponse);
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response = &lresponse;
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}
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init_response(response);
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/* Wait for reply */
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if (read_reply(response) == -1) {
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return NSS_STATUS_UNAVAIL;
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}
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/* Throw away extra data if client didn't request it */
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if (response == &lresponse) {
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free_response(response);
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}
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/* Copy reply data from socket */
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if (response->result != WINBINDD_OK) {
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return NSS_STATUS_NOTFOUND;
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}
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return NSS_STATUS_SUCCESS;
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}
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/* Handle simple types of requests */
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NSS_STATUS winbindd_request(int req_type,
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struct winbindd_request *request,
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struct winbindd_response *response)
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{
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NSS_STATUS status;
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status = winbindd_send_request(req_type, request);
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if (status != NSS_STATUS_SUCCESS)
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return(status);
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return winbindd_get_response(response);
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}
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