/*
- Unix SMB/Netbios implementation.
- Version 2.0
+ 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
Boston, MA 02111-1307, USA.
*/
-#include "winbind_nss_config.h"
-#include "winbindd_nss.h"
+#include "winbind_client.h"
/* Global variables. These are effectively the client state information */
-static int established_socket = -1; /* fd for winbindd socket */
+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)
{
- static char *domain_env;
- static BOOL initialised;
+ request->length = sizeof(struct winbindd_request);
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 */
{
/* Initialise return value */
- response->result = (enum winbindd_result)NSS_STATUS_UNAVAIL;
+ response->result = WINBINDD_ERROR;
}
/* Close established socket */
void close_sock(void)
{
- if (established_socket != -1) {
- close(established_socket);
- established_socket = -1;
+ if (winbindd_fd != -1) {
+ close(winbindd_fd);
+ winbindd_fd = -1;
}
}
-/* Connect to winbindd socket */
+/* Make sure socket handle isn't stdin, stdout or stderr */
+#define RECURSION_LIMIT 3
-static int open_pipe_sock(void)
+static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
{
- struct sockaddr_un sunaddr;
- static pid_t our_pid;
- struct stat st;
- pstring path;
-
- if (our_pid != getpid()) {
- if (established_socket != -1) {
- close(established_socket);
+ int new_fd;
+ if (fd >= 0 && fd <= 2) {
+#ifdef F_DUPFD
+ if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
+ return -1;
}
- established_socket = -1;
- our_pid = getpid();
+ /* 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;
+}
+
+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 closed on exec() */
- if (established_socket != -1) {
- return established_socket;
+#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;
/* Check permissions on unix socket directory */
- if (lstat(WINBINDD_SOCKET_DIR, &st) == -1) {
+ if (lstat(dir, &st) == -1) {
return -1;
}
- if (!S_ISDIR(st.st_mode) || (st.st_uid != 0)) {
+ 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);
+ strncpy(path, dir, sizeof(path) - 1);
path[sizeof(path) - 1] = '\0';
- strncat(path, "/", sizeof(path) - 1);
+ strncat(path, "/", sizeof(path) - 1 - strlen(path));
path[sizeof(path) - 1] = '\0';
- strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1);
+ strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1 - strlen(path));
path[sizeof(path) - 1] = '\0';
ZERO_STRUCT(sunaddr);
/* Check permissions on unix socket file */
- if (!S_ISSOCK(st.st_mode) || (st.st_uid != 0)) {
+ if (!S_ISSOCK(st.st_mode) ||
+ (st.st_uid != 0 && st.st_uid != geteuid())) {
return -1;
}
/* Connect to socket */
- if ((established_socket = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
+ if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
return -1;
}
+
+ if ((fd = make_safe_fd( fd)) == -1) {
+ return fd;
+ }
- if (connect(established_socket, (struct sockaddr *)&sunaddr,
+ if (connect(fd, (struct sockaddr *)&sunaddr,
sizeof(sunaddr)) == -1) {
- close_sock();
+ close(fd);
return -1;
}
- return established_socket;
+ return fd;
+}
+
+/* Connect to winbindd socket */
+
+int winbind_open_pipe_sock(void)
+{
+#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 ((winbindd_fd = winbind_named_pipe_sock(WINBINDD_SOCKET_DIR)) == -1) {
+ return -1;
+ }
+
+ /* version-check the socket */
+
+ if ((winbindd_request(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
+ close_sock();
+ return -1;
+ }
+
+ /* try and get priv pipe */
+
+ if (winbindd_request(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 with timeout */
+/* Write data to winbindd socket */
int write_sock(void *buffer, int count)
{
restart:
- if (open_pipe_sock() == -1) {
+ if (winbind_open_pipe_sock() == -1) {
return -1;
}
while(nwritten < count) {
struct timeval tv;
fd_set r_fds;
- int selret;
/* Catch pipe close on other end by checking if a read()
call would not block by calling select(). */
FD_ZERO(&r_fds);
- FD_SET(established_socket, &r_fds);
+ FD_SET(winbindd_fd, &r_fds);
ZERO_STRUCT(tv);
- if ((selret = select(established_socket + 1, &r_fds,
- NULL, NULL, &tv)) == -1) {
+ 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(established_socket, &r_fds)) {
+ if (!FD_ISSET(winbindd_fd, &r_fds)) {
/* Do the write */
- result = write(established_socket,
+ result = write(winbindd_fd,
(char *)buffer + nwritten,
count - nwritten);
return nwritten;
}
-/* Read data from winbindd socket with timeout */
+/* Read data from winbindd socket */
static int read_sock(void *buffer, int count)
{
while(nread < count) {
- result = read(established_socket, (char *)buffer + nread,
+ result = read(winbindd_fd, (char *)buffer + nread,
count - nread);
if ((result == -1) || (result == 0)) {
if ((result2 = read_sock(response->extra_data, extra_data_len))
== -1) {
+ free_response(response);
return -1;
}
}
return result1 + result2;
}
-/* Free a response structure */
-
-void free_response(struct winbindd_response *response)
-{
- /* Free any allocated extra_data */
-
- if (response && response->extra_data) {
- free(response->extra_data);
- response->extra_data = NULL;
- }
-}
-
-/* Handle simple types of requests */
+/*
+ * send simple types of requests
+ */
-enum nss_status winbindd_request(int req_type,
- struct winbindd_request *request,
- struct winbindd_response *response)
+NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
{
struct winbindd_request lrequest;
- struct winbindd_response lresponse;
-
+ char *env;
+ int value;
+
/* Check for our tricky environment variable */
- if (getenv(WINBINDD_DONT_ENV)) {
- return NSS_STATUS_NOTFOUND;
- }
-
- if (!response) {
- ZERO_STRUCT(lresponse);
- response = &lresponse;
+ if ( (env = getenv(WINBINDD_DONT_ENV)) != NULL ) {
+ value = atoi(env);
+ if ( value == 1 )
+ return NSS_STATUS_NOTFOUND;
}
if (!request) {
/* Fill in request and send down pipe */
init_request(request, req_type);
- init_response(response);
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;
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);
+}
+
+/*************************************************************************
+ A couple of simple jfunctions to disable winbindd lookups and re-
+ enable them
+ ************************************************************************/
+
+BOOL winbind_off( void )
+{
+ return (setenv( WINBINDD_DONT_ENV, "1", 1 ) != -1);
+}
+
+BOOL winbind_on( void )
+{
+ return (setenv( WINBINDD_DONT_ENV, "0", 1 ) != -1);
+}
+
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