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>
37 #define ENSC_WRAPPERS_PREFIX "vcontext: "
38 #define ENSC_WRAPPERS_UNISTD 1
39 #define ENSC_WRAPPERS_VSERVER 1
40 #define ENSC_WRAPPERS_FCNTL 1
41 #define ENSC_WRAPPERS_SOCKET 1
42 #define ENSC_WRAPPERS_IOSOCK 1
45 #define CMD_HELP 0x1000
46 #define CMD_VERSION 0x1001
47 #define CMD_XID 0x4000
48 #define CMD_CREATE 0x4001
49 #define CMD_MIGRATE 0x4003
50 #define CMD_FAKEINIT 0x4002
51 #define CMD_DISCONNECT 0x4004
52 #define CMD_UID 0x4005
53 #define CMD_CHROOT 0x4006
54 #define CMD_SILENT 0x4007
55 #define CMD_SYNCSOCK 0x4008
56 #define CMD_SYNCMSG 0x4009
57 #define CMD_MIGRATESELF 0x400a
58 #define CMD_ENDSETUP 0x400b
59 #define CMD_SILENTEXIST 0x400c
63 { "help", no_argument, 0, CMD_HELP },
64 { "version", no_argument, 0, CMD_VERSION },
65 { "ctx", required_argument, 0, CMD_XID },
66 { "xid", required_argument, 0, CMD_XID },
67 { "create", no_argument, 0, CMD_CREATE },
68 { "migrate", no_argument, 0, CMD_MIGRATE },
69 { "migrate-self", no_argument, 0, CMD_MIGRATESELF },
70 { "fakeinit", no_argument, 0, CMD_FAKEINIT },
71 { "endsetup", no_argument, 0, CMD_ENDSETUP },
72 { "disconnect", no_argument, 0, CMD_DISCONNECT },
73 { "silent", no_argument, 0, CMD_SILENT },
74 { "silentexist", no_argument, 0, CMD_SILENTEXIST },
75 { "uid", required_argument, 0, CMD_UID },
76 { "chroot", no_argument, 0, CMD_CHROOT },
77 { "syncsock", required_argument, 0, CMD_SYNCSOCK },
78 { "syncmsg", required_argument, 0, CMD_SYNCMSG },
94 char const * sync_sock;
95 char const * sync_msg;
98 int wrapper_exit_code = 255;
101 showHelp(int fd, char const *cmd, int res)
103 WRITE_MSG(fd, "Usage:\n ");
106 " --create [--xid <xid>] <opts>* [--] <program> <args>*\n ");
109 " [(--migrate --xid <xid>)|--migrate-self] <opts>* [--] <program> <args>*\n"
112 " --chroot ... chroot into current directory\n"
113 " --uid <uid> ... change uid\n"
114 " --fakeinit ... set current process as general process reaper\n"
115 " for ctx (possible for --migrate only)\n"
116 " --endsetup ... clear the setup flag; usefully for migrate only\n"
117 " --disconnect ... start program in background\n"
118 " --silent ... be silent\n"
119 " --silentexist ... be silent when context exists already; usefully\n"
120 " for '--create' only\n"
121 " --syncsock <file-name>\n"
122 " ... before executing the program, send a message\n"
123 " to the socket and wait until it closes.\n"
124 " <file-name> must be a SOCK_STREAM unix socket\n"
125 " --syncmsg <message>\n"
126 " ... use <message> as synchronization message; by\n"
127 " default, 'ok' will be used\n"
129 "'vcontext --create' exits with code 254 iff the context exists already.\n"
131 "Please report bugs to " PACKAGE_BUGREPORT "\n");
140 "vcontext " VERSION " -- manages the creation of security contexts\n"
141 "This program is part of " PACKAGE_STRING "\n\n"
142 "Copyright (C) 2004 Enrico Scholz\n"
143 VERSION_COPYRIGHT_DISCLAIMER);
147 #include "context-sync.hc"
149 static inline ALWAYSINLINE void
150 tellContext(xid_t ctx, bool do_it)
152 char buf[sizeof(xid_t)*3+2];
157 l = utilvserver_fmt_long(buf,ctx);
159 WRITE_MSG(1, "New security context is ");
165 connectExternalSync(char const *filename)
168 struct sockaddr_un addr;
170 if (filename==0) return -1;
172 ENSC_INIT_UNIX_SOCK(addr, filename);
174 fd = Esocket(PF_UNIX, SOCK_STREAM, 0);
175 Econnect(fd, &addr, sizeof(addr));
181 setFlags(struct Arguments const *args, xid_t xid)
183 struct vc_ctx_flags flags = { 0,0 };
185 if (args->is_fakeinit)
186 flags.mask |= VC_VXF_STATE_INIT;
188 if (args->do_endsetup)
189 flags.mask |= VC_VXF_STATE_SETUP;
192 Evc_set_flags(xid, &flags);
196 doExternalSync(int fd, char const *msg)
202 if (msg) EsendAll(fd, msg, strlen(msg));
203 Eshutdown(fd, SHUT_WR);
205 if (TEMP_FAILURE_RETRY(recv(fd, &c, 1, MSG_NOSIGNAL))!=0) {
206 WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "unexpected external synchronization event\n");
213 static inline ALWAYSINLINE int
214 doit(struct Arguments const *args, char *argv[])
217 pid_t pid = initSync(p, args->do_disconnect);
221 int ext_sync_fd = connectExternalSync(args->sync_sock);
223 doSyncStage0(p, args->do_disconnect);
225 if (args->do_create) {
226 xid = vc_create_context(args->xid);
230 if (!args->is_silentexist)
231 perror(ENSC_WRAPPERS_PREFIX "vc_create_context()");
234 perror(ENSC_WRAPPERS_PREFIX "vc_create_context()");
235 return wrapper_exit_code;
238 tellContext(xid, args->verbosity>=1);
248 if (args->do_migrate && !args->do_migrateself)
249 Evc_migrate_context(xid);
251 if (args->uid!=(uid_t)(-1) && getuid()!=args->uid) {
253 if (getuid()!=args->uid) {
254 WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "Something went wrong while changing the UID\n");
259 doExternalSync(ext_sync_fd, args->sync_msg);
260 doSyncStage1(p, args->do_disconnect);
261 execvp (argv[optind],argv+optind);
262 doSyncStage2(p, args->do_disconnect);
264 PERROR_Q(ENSC_WRAPPERS_PREFIX "execvp", argv[optind]);
268 assert(args->do_disconnect);
270 waitOnSync(pid, p, args->xid!=VC_DYNAMIC_XID && args->do_migrate);
274 int main (int argc, char *argv[])
276 struct Arguments args = {
279 .do_migrateself = false,
280 .do_disconnect = false,
281 .do_endsetup = false,
282 .is_fakeinit = false,
283 .is_silentexist = false,
286 .xid = VC_DYNAMIC_XID,
291 int c = getopt_long(argc, argv, "+", CMDLINE_OPTIONS, 0);
295 case CMD_HELP : showHelp(1, argv[0], 0);
296 case CMD_VERSION : showVersion();
297 case CMD_CREATE : args.do_create = true; break;
298 case CMD_MIGRATE : args.do_migrate = true; break;
299 case CMD_DISCONNECT : args.do_disconnect = true; break;
300 case CMD_ENDSETUP : args.do_endsetup = true; break;
301 case CMD_FAKEINIT : args.is_fakeinit = true; break;
302 case CMD_CHROOT : args.do_chroot = true; break;
303 case CMD_SILENTEXIST : args.is_silentexist = true; break;
304 case CMD_SYNCSOCK : args.sync_sock = optarg; break;
305 case CMD_SYNCMSG : args.sync_msg = optarg; break;
306 case CMD_UID : args.uid = atol(optarg); break;
307 case CMD_XID : args.xid = Evc_xidopt2xid(optarg,true); break;
308 case CMD_SILENT : --args.verbosity; break;
309 case CMD_MIGRATESELF :
310 args.do_migrate = true;
311 args.do_migrateself = true;
315 WRITE_MSG(2, "Try '");
316 WRITE_STR(2, argv[0]);
317 WRITE_MSG(2, " --help\" for more information.\n");
323 if (args.do_migrateself)
324 args.xid = Evc_get_task_xid(0);
326 if (!args.do_create && !args.do_migrate)
327 WRITE_MSG(2, "Neither '--create' nor '--migrate specified; try '--help' for more information\n");
328 else if (args.do_create && args.do_migrate)
329 WRITE_MSG(2, "Can not specify '--create' and '--migrate' at the same time; try '--help' for more information\n");
330 else if (!args.do_migrate && args.is_fakeinit)
331 WRITE_MSG(2, "'--fakeinit' is possible in combination with '--migrate' only\n");
332 else if (!args.do_create && args.xid==VC_DYNAMIC_XID)
333 WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "Can not migrate to an unknown context\n");
334 else if (optind>=argc)
335 WRITE_MSG(2, "No command given; use '--help' for more information.\n");
337 return doit(&args, argv);