-/*
- Copyright (C) Andrew Tridgell 1998
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program 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 General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
-
-/* the socket based protocol for setting up a connection wit rsyncd */
+/* -*- c-file-style: "linux"; -*-
+ *
+ * Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org>
+ * Copyright (C) 2001-2002 by Martin Pool <mbp@samba.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/**
+ * @file
+ *
+ * The socket based protocol for setting up a connection with
+ * rsyncd.
+ **/
#include "rsync.h"
extern int read_only;
extern int verbose;
extern int rsync_port;
-
+char *auth_user;
+extern int sanitize_paths;
+extern int filesfrom_fd;
+
+/**
+ * Run a client connected to an rsyncd. The alternative to this
+ * function for remote-shell connections is do_cmd().
+ *
+ * After negotiating which module to use and reading the server's
+ * motd, this hands over to client_run(). Telling the server the
+ * module will cause it to chroot/setuid/etc.
+ *
+ * Instead of doing a transfer, the client may at this stage instead
+ * get a listing of remote modules and exit.
+ *
+ * @return -1 for error in startup, or the result of client_run().
+ * Either way, it eventually gets passed to exit_cleanup().
+ **/
int start_socket_client(char *host, char *path, int argc, char *argv[])
{
- int fd, i;
- char *sargs[MAX_ARGS];
- int sargc=0;
- char line[MAXPATHLEN];
+ int fd, ret;
char *p, *user=NULL;
- extern int remote_version;
- extern int am_client;
- extern int am_sender;
+ extern char *bind_address;
+ extern int default_af_hint;
+
+ /* this is redundant with code in start_inband_exchange(), but
+ this short-circuits a problem before we open a socket, and
+ the extra check won't hurt */
+ if (*path == '/') {
+ rprintf(FERROR,"ERROR: The remote path must start with a module name not a /\n");
+ return -1;
+ }
p = strchr(host, '@');
if (p) {
*p = 0;
}
- if (!user) user = getenv("USER");
- if (!user) user = getenv("LOGNAME");
+ if (verbose >= 2) {
+ /* FIXME: If we're going to use a socket program for
+ * testing, then this message is wrong. We need to
+ * say something like "(except really using %s)" */
+ rprintf(FINFO, "opening tcp connection to %s port %d\n",
+ host, rsync_port);
+ }
+ fd = open_socket_out_wrapped (host, rsync_port, bind_address,
+ default_af_hint);
+ if (fd == -1) {
+ exit_cleanup(RERR_SOCKETIO);
+ }
- am_client = 1;
+ ret = start_inband_exchange(user, path, fd, fd, argc);
- fd = open_socket_out(host, rsync_port);
- if (fd == -1) {
- exit_cleanup(1);
+ return ret < 0? ret : client_run(fd, fd, -1, argc, argv);
+}
+
+int start_inband_exchange(char *user, char *path, int f_in, int f_out, int argc)
+{
+ int i;
+ char *sargs[MAX_ARGS];
+ int sargc = 0;
+ char line[MAXPATHLEN];
+ char *p;
+ extern int remote_version;
+ extern int kludge_around_eof;
+ extern int am_sender;
+ extern int daemon_over_rsh;
+ extern int list_only;
+
+ if (argc == 0 && !am_sender)
+ list_only = 1;
+
+ if (*path == '/') {
+ rprintf(FERROR, "ERROR: The remote path must start with a module name\n");
+ return -1;
}
-
- server_options(sargs,&sargc);
+
+ if (!user) user = getenv("USER");
+ if (!user) user = getenv("LOGNAME");
+
+ /* set daemon_over_rsh to false since we need to build the
+ true set of args passed through the rsh/ssh connection;
+ this is a no-op for direct-socket-connection mode */
+ daemon_over_rsh = 0;
+ server_options(sargs, &sargc);
sargs[sargc++] = ".";
sargs[sargc] = NULL;
- io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
+ io_printf(f_out, "@RSYNCD: %d\n", PROTOCOL_VERSION);
- if (!read_line(fd, line, sizeof(line)-1)) {
+ if (!read_line(f_in, line, sizeof(line)-1)) {
+ rprintf(FERROR, "rsync: did not see server greeting\n");
return -1;
}
if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
+ /* note that read_line strips of \n or \r */
+ rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n",
+ line);
return -1;
}
p = strchr(path,'/');
if (p) *p = 0;
- io_printf(fd,"%s\n",path);
+ io_printf(f_out, "%s\n", path);
if (p) *p = '/';
+ /* Old servers may just drop the connection here,
+ rather than sending a proper EXIT command. Yuck. */
+ kludge_around_eof = list_only && (remote_version < 25);
+
while (1) {
- if (!read_line(fd, line, sizeof(line)-1)) {
+ if (!read_line(f_in, line, sizeof(line)-1)) {
+ rprintf(FERROR, "rsync: didn't get server startup line\n");
return -1;
}
if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
- auth_client(fd, user, line+18);
+ auth_client(f_out, user, line+18);
continue;
}
if (strcmp(line,"@RSYNCD: OK") == 0) break;
- rprintf(FINFO,"%s\n", line);
+
+ if (strcmp(line,"@RSYNCD: EXIT") == 0) {
+ /* This is sent by recent versions of the
+ * server to terminate the listing of modules.
+ * We don't want to go on and transfer
+ * anything; just exit. */
+ exit(0);
+ }
+
+ if (strncmp(line, "@ERROR", 6) == 0) {
+ rprintf(FERROR,"%s\n", line);
+ /* This is always fatal; the server will now
+ * close the socket. */
+ return RERR_STARTCLIENT;
+ } else {
+ rprintf(FINFO,"%s\n", line);
+ }
}
+ kludge_around_eof = False;
- for (i=0;i<sargc;i++) {
- io_printf(fd,"%s\n", sargs[i]);
+ for (i = 0; i < sargc; i++) {
+ io_printf(f_out, "%s\n", sargs[i]);
}
- io_printf(fd,"\n");
+ io_printf(f_out, "\n");
- if (remote_version > 17 && !am_sender)
- io_start_multiplex_in(fd);
+ if (remote_version < 23) {
+ if (remote_version == 22 || (remote_version > 17 && !am_sender))
+ io_start_multiplex_in(f_in);
+ }
- return client_run(fd, fd, -1, argc, argv);
+ return 0;
}
-static int rsync_module(int fd, int i)
+static int rsync_module(int f_in, int f_out, int i)
{
int argc=0;
char *argv[MAX_ARGS];
char **argp;
char line[MAXPATHLEN];
- uid_t uid = (uid_t)-2;
+ uid_t uid = (uid_t)-2; /* canonically "nobody" */
gid_t gid = (gid_t)-2;
char *p;
- char *addr = client_addr(fd);
- char *host = client_name(fd);
+ char *addr = client_addr(f_in);
+ char *host = client_name(f_in);
char *name = lp_name(i);
- char *user;
+ int use_chroot = lp_use_chroot(i);
int start_glob=0;
int ret;
char *request=NULL;
extern int am_sender;
+ extern int am_server;
+ extern int am_daemon;
extern int remote_version;
extern int am_root;
if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
- name, client_name(fd), client_addr(fd));
- io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
- name, client_name(fd), client_addr(fd));
+ name, host, addr);
+ io_printf(f_out, "@ERROR: access denied to %s from %s (%s)\n",
+ name, host, addr);
return -1;
}
- if (!claim_connection(lp_lock_file(), lp_max_connections())) {
+ if (am_daemon && am_server) {
+ rprintf(FINFO, "rsync allowed access on module %s from %s (%s)\n",
+ name, host, addr);
+ }
+
+ if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
if (errno) {
rprintf(FERROR,"failed to open lock file %s : %s\n",
- lp_lock_file(), strerror(errno));
- io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
- lp_lock_file(), strerror(errno));
+ lp_lock_file(i), strerror(errno));
+ io_printf(f_out, "@ERROR: failed to open lock file %s : %s\n",
+ lp_lock_file(i), strerror(errno));
} else {
rprintf(FERROR,"max connections (%d) reached\n",
- lp_max_connections());
- io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections());
+ lp_max_connections(i));
+ io_printf(f_out, "@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i));
}
return -1;
}
- user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
+ auth_user = auth_server(f_in, f_out, i, addr, "@RSYNCD: AUTHREQD ");
- if (!user) {
+ if (!auth_user) {
rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
- name, client_name(fd), client_addr(fd));
- io_printf(fd,"@ERROR: auth failed on module %s\n",name);
+ name, host, addr);
+ io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
return -1;
}
module_id = i;
- if (lp_read_only(i))
- read_only = 1;
+ am_root = (getuid() == 0);
- p = lp_uid(i);
- if (!name_to_uid(p, &uid)) {
- if (!isdigit(*p)) {
- rprintf(FERROR,"Invalid uid %s\n", p);
- io_printf(fd,"@ERROR: invalid uid\n");
- return -1;
- }
- uid = atoi(p);
- }
+ if (am_root) {
+ p = lp_uid(i);
+ if (!name_to_uid(p, &uid)) {
+ if (!isdigit(* (unsigned char *) p)) {
+ rprintf(FERROR,"Invalid uid %s\n", p);
+ io_printf(f_out, "@ERROR: invalid uid %s\n", p);
+ return -1;
+ }
+ uid = atoi(p);
+ }
- p = lp_gid(i);
- if (!name_to_gid(p, &gid)) {
- if (!isdigit(*p)) {
- rprintf(FERROR,"Invalid gid %s\n", p);
- io_printf(fd,"@ERROR: invalid gid\n");
- return -1;
- }
- gid = atoi(p);
+ p = lp_gid(i);
+ if (!name_to_gid(p, &gid)) {
+ if (!isdigit(* (unsigned char *) p)) {
+ rprintf(FERROR,"Invalid gid %s\n", p);
+ io_printf(f_out, "@ERROR: invalid gid %s\n", p);
+ return -1;
+ }
+ gid = atoi(p);
+ }
}
+
+ /* TODO: If we're not root, but the configuration requests
+ * that we change to some uid other than the current one, then
+ * log a warning. */
+
+ /* TODO: Perhaps take a list of gids, and make them into the
+ * supplementary groups. */
+
+ p = lp_include_from(i);
+ add_exclude_file(p, 1, 1);
+
+ p = lp_include(i);
+ add_include_line(p);
p = lp_exclude_from(i);
add_exclude_file(p, 1, 0);
p = lp_exclude(i);
add_exclude_line(p);
- log_open();
+ log_init();
+
+ if (use_chroot) {
+ /*
+ * XXX: The 'use chroot' flag is a fairly reliable
+ * source of confusion, because it fails under two
+ * important circumstances: running as non-root,
+ * running on Win32 (or possibly others). On the
+ * other hand, if you are running as root, then it
+ * might be better to always use chroot.
+ *
+ * So, perhaps if we can't chroot we should just issue
+ * a warning, unless a "require chroot" flag is set,
+ * in which case we fail.
+ */
+ if (chroot(lp_path(i))) {
+ rsyserr(FERROR, errno, "chroot %s failed", lp_path(i));
+ io_printf(f_out, "@ERROR: chroot failed\n");
+ return -1;
+ }
- if (chroot(lp_path(i))) {
- rprintf(FERROR,"chroot %s failed\n", lp_path(i));
- io_printf(fd,"@ERROR: chroot failed\n");
- return -1;
- }
+ if (!push_dir("/", 0)) {
+ rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
+ io_printf(f_out, "@ERROR: chdir failed\n");
+ return -1;
+ }
- if (chdir("/")) {
- rprintf(FERROR,"chdir %s failed\n", lp_path(i));
- io_printf(fd,"@ERROR: chdir failed\n");
- return -1;
+ } else {
+ if (!push_dir(lp_path(i), 0)) {
+ rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
+ io_printf(f_out, "@ERROR: chdir failed\n");
+ return -1;
+ }
+ sanitize_paths = 1;
}
- if (setgid(gid) || getgid() != gid) {
- rprintf(FERROR,"setgid %d failed\n", gid);
- io_printf(fd,"@ERROR: setgid failed\n");
- return -1;
- }
+ if (am_root) {
+#ifdef HAVE_SETGROUPS
+ /* Get rid of any supplementary groups this process
+ * might have inheristed. */
+ if (setgroups(0, NULL)) {
+ rsyserr(FERROR, errno, "setgroups failed");
+ io_printf(f_out, "@ERROR: setgroups failed\n");
+ return -1;
+ }
+#endif
- if (setuid(uid) || getuid() != uid) {
- rprintf(FERROR,"setuid %d failed\n", uid);
- io_printf(fd,"@ERROR: setuid failed\n");
- return -1;
- }
+ /* XXXX: You could argue that if the daemon is started
+ * by a non-root user and they explicitly specify a
+ * gid, then we should try to change to that gid --
+ * this could be possible if it's already in their
+ * supplementary groups. */
- am_root = (getuid() == 0);
+ /* TODO: Perhaps we need to document that if rsyncd is
+ * started by somebody other than root it will inherit
+ * all their supplementary groups. */
+
+ if (setgid(gid)) {
+ rsyserr(FERROR, errno, "setgid %d failed", (int) gid);
+ io_printf(f_out, "@ERROR: setgid failed\n");
+ return -1;
+ }
+
+ if (setuid(uid)) {
+ rsyserr(FERROR, errno, "setuid %d failed", (int) uid);
+ io_printf(f_out, "@ERROR: setuid failed\n");
+ return -1;
+ }
+
+ am_root = (getuid() == 0);
+ }
- io_printf(fd,"@RSYNCD: OK\n");
+ io_printf(f_out, "@RSYNCD: OK\n");
argv[argc++] = "rsyncd";
while (1) {
- if (!read_line(fd, line, sizeof(line)-1)) {
+ if (!read_line(f_in, line, sizeof(line)-1)) {
return -1;
}
}
}
- ret = parse_arguments(argc, argv);
+ if (sanitize_paths) {
+ /*
+ * Note that this is applied to all parameters, whether or not
+ * they are filenames, but no other legal parameters contain
+ * the forms that need to be sanitized so it doesn't hurt;
+ * it is not known at this point which parameters are files
+ * and which aren't.
+ */
+ for (i = 1; i < argc; i++) {
+ sanitize_path(argv[i], NULL);
+ }
+ }
+
+ argp = argv;
+ ret = parse_arguments(&argc, (const char ***) &argp, 0);
+
+ if (filesfrom_fd == 0)
+ filesfrom_fd = f_in;
if (request) {
- if (*user) {
+ if (*auth_user) {
rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
am_sender?"on":"to",
- request, user, host, addr);
+ request, auth_user, host, addr);
} else {
rprintf(FINFO,"rsync %s %s from %s (%s)\n",
am_sender?"on":"to",
free(request);
}
+#ifndef DEBUG
/* don't allow the logs to be flooded too fast */
if (verbose > 1) verbose = 1;
+#endif
- argc -= optind;
- argp = argv + optind;
- optind = 0;
-
- if (remote_version > 17 && am_sender)
- io_start_multiplex_out(fd);
-
+ if (remote_version < 23) {
+ if (remote_version == 22 || (remote_version > 17 && am_sender))
+ io_start_multiplex_out(f_out);
+ }
+
+ /* For later protocol versions, we don't start multiplexing
+ * until we've configured nonblocking in start_server. That
+ * means we're in a sticky situation now: there's no way to
+ * convey errors to the client. */
+
+ /* FIXME: Hold off on reporting option processing errors until
+ * we've set up nonblocking and multiplexed IO and can get the
+ * message back to them. */
if (!ret) {
- rprintf(FERROR,"Error parsing options (unsupported option?) - aborting\n");
- exit_cleanup(1);
+ option_error();
+ exit_cleanup(RERR_UNSUPPORTED);
+ }
+
+ if (lp_timeout(i)) {
+ extern int io_timeout;
+ io_timeout = lp_timeout(i);
}
- start_server(fd, fd, argc, argp);
+ start_server(f_in, f_out, argc, argp);
return 0;
}
{
int n = lp_numservices();
int i;
-
+ extern int remote_version;
+
for (i=0;i<n;i++)
if (lp_list(i))
io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
+
+ if (remote_version >= 25)
+ io_printf(fd,"@RSYNCD: EXIT\n");
}
-/* this is called when a socket connection is established to a client
+/* this is called when a connection is established to a client
and we want to start talking. The setup of the system is done from
here */
-static int start_daemon(int fd)
+int start_daemon(int f_in, int f_out)
{
char line[200];
char *motd;
int i = -1;
extern char *config_file;
extern int remote_version;
+ extern int am_server;
if (!lp_load(config_file, 0)) {
- exit_cleanup(1);
+ exit_cleanup(RERR_SYNTAX);
}
- set_socket_options(fd,"SO_KEEPALIVE");
- set_socket_options(fd,lp_socket_options());
-
+ log_init();
+
+ if (!am_server) {
+ set_socket_options(f_in, "SO_KEEPALIVE");
+ set_socket_options(f_in, lp_socket_options());
+ set_nonblocking(f_in);
+ }
- io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
+ io_printf(f_out, "@RSYNCD: %d\n", PROTOCOL_VERSION);
motd = lp_motd_file();
- if (*motd) {
+ if (motd && *motd) {
FILE *f = fopen(motd,"r");
while (f && !feof(f)) {
int len = fread(line, 1, sizeof(line)-1, f);
if (len > 0) {
line[len] = 0;
- io_printf(fd,"%s", line);
+ io_printf(f_out, "%s", line);
}
}
if (f) fclose(f);
- io_printf(fd,"\n");
+ io_printf(f_out, "\n");
}
- if (!read_line(fd, line, sizeof(line)-1)) {
+ if (!read_line(f_in, line, sizeof(line)-1)) {
return -1;
}
if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
- io_printf(fd,"@ERROR: protocol startup error\n");
+ io_printf(f_out, "@ERROR: protocol startup error\n");
return -1;
}
while (i == -1) {
line[0] = 0;
- if (!read_line(fd, line, sizeof(line)-1)) {
+ if (!read_line(f_in, line, sizeof(line)-1)) {
return -1;
}
if (!*line || strcmp(line,"#list")==0) {
- send_listing(fd);
+ send_listing(f_out);
return -1;
}
if (*line == '#') {
/* it's some sort of command that I don't understand */
- io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
+ io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
return -1;
}
i = lp_number(line);
if (i == -1) {
- io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
+ io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
return -1;
}
}
- return rsync_module(fd, i);
+ return rsync_module(f_in, f_out, i);
}
int daemon_main(void)
{
extern char *config_file;
-
- /* this ensures that we don't call getcwd after the chroot,
- which doesn't work on platforms that use popen("pwd","r")
- for getcwd */
- push_dir("/", 0);
+ extern int orig_umask;
+ char *pid_file;
+ extern int no_detach;
if (is_a_socket(STDIN_FILENO)) {
int i;
close(i);
open("/dev/null", O_RDWR);
}
- return start_daemon(STDIN_FILENO);
+
+ return start_daemon(STDIN_FILENO, STDIN_FILENO);
}
- become_daemon();
+ if (!no_detach)
+ become_daemon();
if (!lp_load(config_file, 1)) {
- fprintf(stderr,"failed to load config file %s\n", config_file);
- exit_cleanup(1);
+ exit_cleanup(RERR_SYNTAX);
}
- log_open();
-
- rprintf(FINFO,"rsyncd version %s starting\n",VERSION);
+ log_init();
+
+ rprintf(FINFO, "rsyncd version %s starting, listening on port %d\n",
+ RSYNC_VERSION,
+ rsync_port);
+ /* TODO: If listening on a particular address, then show that
+ * address too. In fact, why not just do inet_ntop on the
+ * local address??? */
+
+ if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
+ char pidbuf[16];
+ int fd;
+ int pid = (int) getpid();
+ cleanup_set_pid(pid);
+ if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
+ 0666 & ~orig_umask)) == -1) {
+ cleanup_set_pid(0);
+ rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
+ exit_cleanup(RERR_FILEIO);
+ }
+ snprintf(pidbuf, sizeof(pidbuf), "%d\n", pid);
+ write(fd, pidbuf, strlen(pidbuf));
+ close(fd);
+ }
start_accept_loop(rsync_port, start_daemon);
return -1;
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff