X-Git-Url: http://git.maemo.org/git/?p=samba;a=blobdiff_plain;f=source%2Fnsswitch%2Fwb_common.c;fp=source%2Fnsswitch%2Fwb_common.c;h=0e2092794116eb2f62e8f96e3666cf11ca65a8e1;hp=0000000000000000000000000000000000000000;hb=6bca4ca307d55b6dc888e56cee47aebcddbce786;hpb=7fd70fa738b636089bcc6c961aa3eaa02f20dda2 diff --git a/source/nsswitch/wb_common.c b/source/nsswitch/wb_common.c new file mode 100644 index 0000000..0e20927 --- /dev/null +++ b/source/nsswitch/wb_common.c @@ -0,0 +1,629 @@ +/* + 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; +}