+/*
+ Unix SMB/CIFS implementation.
+
+ winbind client common code
+
+ Copyright (C) Tim Potter 2000
+ Copyright (C) Andrew Tridgell 2000
+ Copyright (C) Andrew Bartlett 2002
+
+
+ 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_client.h"
+
+/* Global variables. These are effectively the client state information */
+
+int winbindd_fd = -1; /* fd for winbindd socket */
+
+/* Free a response structure */
+
+void free_response(struct winbindd_response *response)
+{
+ /* Free any allocated extra_data */
+
+ if (response)
+ SAFE_FREE(response->extra_data);
+}
+
+/* Initialise a request structure */
+
+void init_request(struct winbindd_request *request, int request_type)
+{
+ request->length = sizeof(struct winbindd_request);
+
+ request->cmd = (enum winbindd_cmd)request_type;
+ request->pid = getpid();
+
+}
+
+/* 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;
+ }
+}
+
+#define CONNECT_TIMEOUT 30
+#define WRITE_TIMEOUT CONNECT_TIMEOUT
+#define READ_TIMEOUT CONNECT_TIMEOUT
+
+/* Make sure socket handle isn't stdin, stdout or stderr */
+#define RECURSION_LIMIT 3
+
+static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
+{
+ int new_fd;
+ if (fd >= 0 && fd <= 2) {
+#ifdef F_DUPFD
+ if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
+ return -1;
+ }
+ /* Paranoia */
+ if (new_fd < 3) {
+ close(new_fd);
+ return -1;
+ }
+ close(fd);
+ return new_fd;
+#else
+ if (limit <= 0)
+ return -1;
+
+ new_fd = dup(fd);
+ if (new_fd == -1)
+ return -1;
+
+ /* use the program stack to hold our list of FDs to close */
+ new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
+ close(fd);
+ return new_fd;
+#endif
+ }
+ 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_internals(fd, RECURSION_LIMIT);
+ if (new_fd == -1) {
+ close(fd);
+ return -1;
+ }
+
+ /* 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) {
+ close(new_fd);
+ return -1;
+ }
+
+ flags |= FLAG_TO_SET;
+ if (fcntl(new_fd, F_SETFL, flags) == -1) {
+ close(new_fd);
+ return -1;
+ }
+
+#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) {
+ close(new_fd);
+ return -1;
+ }
+#endif
+ return new_fd;
+}
+
+/* Connect to winbindd socket */
+
+static int winbind_named_pipe_sock(const char *dir)
+{
+ struct sockaddr_un sunaddr;
+ struct stat st;
+ pstring path;
+ int fd;
+ int wait_time;
+ int slept;
+
+ /* Check permissions on unix socket directory */
+
+ if (lstat(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, dir, sizeof(path) - 1);
+ path[sizeof(path) - 1] = '\0';
+
+ strncat(path, "/", sizeof(path) - 1 - strlen(path));
+ path[sizeof(path) - 1] = '\0';
+
+ strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1 - strlen(path));
+ 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 ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
+ return -1;
+ }
+
+ /* Set socket non-blocking and close on exec. */
+
+ if ((fd = make_safe_fd( fd)) == -1) {
+ return fd;
+ }
+
+ for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
+ wait_time += slept) {
+ struct timeval tv;
+ fd_set w_fds;
+ int ret;
+ int connect_errno = 0;
+ socklen_t errnosize;
+
+ if (wait_time >= CONNECT_TIMEOUT)
+ goto error_out;
+
+ switch (errno) {
+ case EINPROGRESS:
+ FD_ZERO(&w_fds);
+ FD_SET(fd, &w_fds);
+ tv.tv_sec = CONNECT_TIMEOUT - wait_time;
+ tv.tv_usec = 0;
+
+ ret = select(fd + 1, NULL, &w_fds, NULL, &tv);
+
+ if (ret > 0) {
+ errnosize = sizeof(connect_errno);
+
+ ret = getsockopt(fd, SOL_SOCKET,
+ SO_ERROR, &connect_errno, &errnosize);
+
+ if (ret >= 0 && connect_errno == 0) {
+ /* Connect succeed */
+ goto out;
+ }
+ }
+
+ slept = CONNECT_TIMEOUT;
+ break;
+ case EAGAIN:
+ slept = rand() % 3 + 1;
+ sleep(slept);
+ break;
+ default:
+ goto error_out;
+ }
+
+ }
+
+ out:
+
+ return fd;
+
+ error_out:
+
+ close(fd);
+ return -1;
+}
+
+/* Connect to winbindd socket */
+
+static int winbind_open_pipe_sock(int recursing)
+{
+#ifdef HAVE_UNIXSOCKET
+ static pid_t our_pid;
+ struct winbindd_request request;
+ struct winbindd_response response;
+ ZERO_STRUCT(request);
+ ZERO_STRUCT(response);
+
+ if (our_pid != getpid()) {
+ close_sock();
+ our_pid = getpid();
+ }
+
+ if (winbindd_fd != -1) {
+ return winbindd_fd;
+ }
+
+ if (recursing) {
+ return -1;
+ }
+
+ if ((winbindd_fd = winbind_named_pipe_sock(WINBINDD_SOCKET_DIR)) == -1) {
+ return -1;
+ }
+
+ /* version-check the socket */
+
+ request.flags = WBFLAG_RECURSE;
+ if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
+ close_sock();
+ return -1;
+ }
+
+ /* try and get priv pipe */
+
+ request.flags = WBFLAG_RECURSE;
+ if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
+ int fd;
+ if ((fd = winbind_named_pipe_sock(response.extra_data)) != -1) {
+ close(winbindd_fd);
+ winbindd_fd = fd;
+ }
+ }
+
+ SAFE_FREE(response.extra_data);
+
+ return winbindd_fd;
+#else
+ return -1;
+#endif /* HAVE_UNIXSOCKET */
+}
+
+/* Write data to winbindd socket */
+
+int write_sock(void *buffer, int count, int recursing)
+{
+ int result, nwritten;
+
+ /* Open connection to winbind daemon */
+
+ restart:
+
+ if (winbind_open_pipe_sock(recursing) == -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 */
+
+static int read_sock(void *buffer, int count)
+{
+ int result = 0, nread = 0;
+ int total_time = 0, selret;
+
+ /* Read data from socket */
+ while(nread < 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);
+ /* Wait for 5 seconds for a reply. May need to parameterise this... */
+ tv.tv_sec = 5;
+
+ if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
+ close_sock();
+ return -1; /* Select error */
+ }
+
+ if (selret == 0) {
+ /* Not ready for read yet... */
+ if (total_time >= 30) {
+ /* Timeout */
+ close_sock();
+ return -1;
+ }
+ total_time += 5;
+ continue;
+ }
+
+ if (FD_ISSET(winbindd_fd, &r_fds)) {
+
+ /* Do the Read */
+
+ 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;
+ char *env;
+ int value;
+
+ /* Check for our tricky environment variable */
+
+ if ( (env = getenv(WINBINDD_DONT_ENV)) != NULL ) {
+ value = atoi(env);
+ if ( value == 1 )
+ 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), request->flags & WBFLAG_RECURSE) == -1) {
+ return NSS_STATUS_UNAVAIL;
+ }
+
+ if ((request->extra_len != 0) &&
+ (write_sock(request->extra_data, request->extra_len, request->flags & WBFLAG_RECURSE) == -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_response(int req_type,
+ struct winbindd_request *request,
+ struct winbindd_response *response)
+{
+ NSS_STATUS status = NSS_STATUS_UNAVAIL;
+ int count = 0;
+
+ while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
+ status = winbindd_send_request(req_type, request);
+ if (status != NSS_STATUS_SUCCESS)
+ return(status);
+ status = winbindd_get_response(response);
+ count += 1;
+ }
+
+ return status;
+}
+
+/*************************************************************************
+ A couple of simple functions to disable winbindd lookups and re-
+ enable them
+ ************************************************************************/
+
+/* Use putenv() instead of setenv() in these functions as not all
+ environments have the latter. */
+
+BOOL winbind_off( void )
+{
+ static char *s = CONST_DISCARD(char *, WINBINDD_DONT_ENV "=1");
+
+ return putenv(s) != -1;
+}
+
+BOOL winbind_on( void )
+{
+ static char *s = CONST_DISCARD(char *, WINBINDD_DONT_ENV "=0");
+
+ return putenv(s) != -1;
+}
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