3 // Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
5 // This program is free software; you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation; version 2 of the License.
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License
15 // along with this program; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include "lib/internal.h"
25 #include "lib_internal/jail.h"
27 #include "linuxcaps.h"
33 #include <sys/socket.h>
38 #define ENSC_WRAPPERS_PREFIX "vcontext: "
39 #define ENSC_WRAPPERS_UNISTD 1
40 #define ENSC_WRAPPERS_VSERVER 1
41 #define ENSC_WRAPPERS_FCNTL 1
42 #define ENSC_WRAPPERS_SOCKET 1
43 #define ENSC_WRAPPERS_IOSOCK 1
46 #define CMD_HELP 0x1000
47 #define CMD_VERSION 0x1001
48 #define CMD_XID 0x4000
49 #define CMD_CREATE 0x4001
50 #define CMD_MIGRATE 0x4003
51 #define CMD_INITPID 0x4002
52 #define CMD_DISCONNECT 0x4004
53 #define CMD_UID 0x4005
54 #define CMD_CHROOT 0x4006
55 #define CMD_SILENT 0x4007
56 #define CMD_SYNCSOCK 0x4008
57 #define CMD_SYNCMSG 0x4009
58 #define CMD_MIGRATESELF 0x400a
59 #define CMD_ENDSETUP 0x400b
60 #define CMD_SILENTEXIST 0x400c
65 { "help", no_argument, 0, CMD_HELP },
66 { "version", no_argument, 0, CMD_VERSION },
67 { "ctx", required_argument, 0, CMD_XID },
68 { "xid", required_argument, 0, CMD_XID },
69 { "create", no_argument, 0, CMD_CREATE },
70 { "migrate", no_argument, 0, CMD_MIGRATE },
71 { "migrate-self", no_argument, 0, CMD_MIGRATESELF },
72 { "initpid", no_argument, 0, CMD_INITPID },
73 { "endsetup", no_argument, 0, CMD_ENDSETUP },
74 { "disconnect", no_argument, 0, CMD_DISCONNECT },
75 { "silent", no_argument, 0, CMD_SILENT },
76 { "silentexist", no_argument, 0, CMD_SILENTEXIST },
77 { "uid", required_argument, 0, CMD_UID },
78 { "chroot", no_argument, 0, CMD_CHROOT },
79 { "syncsock", required_argument, 0, CMD_SYNCSOCK },
80 { "syncmsg", required_argument, 0, CMD_SYNCMSG },
82 { "fakeinit", no_argument, 0, CMD_INITPID }, // compatibility
99 char const * sync_sock;
100 char const * sync_msg;
103 int wrapper_exit_code = 255;
106 showHelp(int fd, char const *cmd, int res)
108 WRITE_MSG(fd, "Usage:\n ");
111 " --create [--xid <xid>] <opts>* [--] <program> <args>*\n ");
114 " [(--migrate --xid <xid>)|--migrate-self] <opts>* [--] <program> <args>*\n"
117 " --chroot ... chroot into current directory\n"
118 " --uid <uid> ... change uid\n"
119 " --initpid ... set current process as general process reaper\n"
120 " for ctx (possible for --migrate only)\n"
121 " --endsetup ... clear the setup flag; usefully for migrate only\n"
122 " --disconnect ... start program in background\n"
123 " --silent ... be silent\n"
124 " --silentexist ... be silent when context exists already; usefully\n"
125 " for '--create' only\n"
126 " --syncsock <file-name>\n"
127 " ... before executing the program, send a message\n"
128 " to the socket and wait until it closes.\n"
129 " <file-name> must be a SOCK_STREAM unix socket\n"
130 " --syncmsg <message>\n"
131 " ... use <message> as synchronization message; by\n"
132 " default, 'ok' will be used\n"
134 "'vcontext --create' exits with code 254 iff the context exists already.\n"
136 "Please report bugs to " PACKAGE_BUGREPORT "\n");
145 "vcontext " VERSION " -- manages the creation of security contexts\n"
146 "This program is part of " PACKAGE_STRING "\n\n"
147 "Copyright (C) 2004 Enrico Scholz\n"
148 VERSION_COPYRIGHT_DISCLAIMER);
152 #include "context-sync.hc"
154 static inline ALWAYSINLINE void
155 tellContext(xid_t ctx, bool do_it)
157 char buf[sizeof(xid_t)*3+2];
162 l = utilvserver_fmt_long(buf,ctx);
164 WRITE_MSG(1, "New security context is ");
170 connectExternalSync(char const *filename)
173 struct sockaddr_un addr;
175 if (filename==0) return -1;
177 ENSC_INIT_UNIX_SOCK(addr, filename);
179 fd = Esocket(PF_UNIX, SOCK_STREAM, 0);
180 Econnect(fd, &addr, sizeof(addr));
186 setFlags(struct Arguments const *args, xid_t xid)
188 struct vc_ctx_flags flags = { 0,0 };
190 if (args->is_initpid)
191 flags.mask |= VC_VXF_STATE_INIT;
193 if (args->do_endsetup)
194 flags.mask |= VC_VXF_STATE_SETUP;
197 DPRINTF("set_flags: mask=%08llx, flag=%08llx\n", flags.mask, flags.flagword);
198 Evc_set_cflags(xid, &flags);
203 doExternalSync(int fd, char const *msg)
209 if (msg) EsendAll(fd, msg, strlen(msg));
210 Eshutdown(fd, SHUT_WR);
212 if (TEMP_FAILURE_RETRY(recv(fd, &c, 1, MSG_NOSIGNAL))!=0) {
213 WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "unexpected external synchronization event\n");
220 static inline ALWAYSINLINE int
221 doit(struct Arguments const *args, char *argv[])
224 pid_t pid = initSync(p, args->do_disconnect);
228 int ext_sync_fd = connectExternalSync(args->sync_sock);
230 doSyncStage0(p, args->do_disconnect);
232 if (args->do_create) {
233 xid = vc_ctx_create(args->xid);
237 if (!args->is_silentexist)
238 perror(ENSC_WRAPPERS_PREFIX "vc_create_context()");
241 perror(ENSC_WRAPPERS_PREFIX "vc_create_context()");
242 return wrapper_exit_code;
245 tellContext(xid, args->verbosity>=1);
255 if (args->do_migrate && !args->do_migrateself)
256 Evc_ctx_migrate(xid);
258 if (args->uid!=(uid_t)(-1) && getuid()!=args->uid) {
260 if (getuid()!=args->uid) {
261 WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "Something went wrong while changing the UID\n");
266 doExternalSync(ext_sync_fd, args->sync_msg);
267 doSyncStage1(p, args->do_disconnect);
268 DPRINTF("doit: pid=%u, ppid=%u\n", getpid(), getppid());
269 execvp (argv[optind],argv+optind);
270 doSyncStage2(p, args->do_disconnect);
272 PERROR_Q(ENSC_WRAPPERS_PREFIX "execvp", argv[optind]);
276 assert(args->do_disconnect);
278 waitOnSync(pid, p, args->xid!=VC_DYNAMIC_XID && args->do_migrate);
282 int main (int argc, char *argv[])
284 struct Arguments args = {
287 .do_migrateself = false,
288 .do_disconnect = false,
289 .do_endsetup = false,
291 .is_silentexist = false,
294 .xid = VC_DYNAMIC_XID,
299 int c = getopt_long(argc, argv, "+", CMDLINE_OPTIONS, 0);
303 case CMD_HELP : showHelp(1, argv[0], 0);
304 case CMD_VERSION : showVersion();
305 case CMD_CREATE : args.do_create = true; break;
306 case CMD_MIGRATE : args.do_migrate = true; break;
307 case CMD_DISCONNECT : args.do_disconnect = true; break;
308 case CMD_ENDSETUP : args.do_endsetup = true; break;
309 case CMD_INITPID : args.is_initpid = true; break;
310 case CMD_CHROOT : args.do_chroot = true; break;
311 case CMD_SILENTEXIST : args.is_silentexist = true; break;
312 case CMD_SYNCSOCK : args.sync_sock = optarg; break;
313 case CMD_SYNCMSG : args.sync_msg = optarg; break;
314 case CMD_UID : args.uid = atol(optarg); break;
315 case CMD_XID : args.xid = Evc_xidopt2xid(optarg,true); break;
316 case CMD_SILENT : --args.verbosity; break;
317 case CMD_MIGRATESELF :
318 args.do_migrate = true;
319 args.do_migrateself = true;
323 WRITE_MSG(2, "Try '");
324 WRITE_STR(2, argv[0]);
325 WRITE_MSG(2, " --help\" for more information.\n");
331 signal(SIGCHLD, SIG_DFL);
333 if (args.do_migrateself)
334 args.xid = Evc_get_task_xid(0);
336 if (!args.do_create && !args.do_migrate)
337 WRITE_MSG(2, "Neither '--create' nor '--migrate specified; try '--help' for more information\n");
338 else if (args.do_create && args.do_migrate)
339 WRITE_MSG(2, "Can not specify '--create' and '--migrate' at the same time; try '--help' for more information\n");
340 else if (!args.do_migrate && args.is_initpid)
341 WRITE_MSG(2, "'--initpid' is possible in combination with '--migrate' only\n");
342 else if (!args.do_create && args.xid==VC_DYNAMIC_XID)
343 WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "Can not migrate to an unknown context\n");
344 else if (optind>=argc)
345 WRITE_MSG(2, "No command given; use '--help' for more information.\n");
347 return doit(&args, argv);