--- /dev/null
+// $Id: vcontext.c,v 1.18 2005/04/28 18:08:12 ensc Exp $ --*- c -*--
+
+// Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//
+// 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; version 2 of the License.
+//
+// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "util.h"
+#include "lib/internal.h"
+#include "lib_internal/jail.h"
+#include "lib_internal/sys_personality.h"
+
+#include <vserver.h>
+#include <getopt.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <assert.h>
+#include <signal.h>
+
+#include <linux/personality.h>
+
+#define ENSC_WRAPPERS_PREFIX "vcontext: "
+#define ENSC_WRAPPERS_UNISTD 1
+#define ENSC_WRAPPERS_VSERVER 1
+#define ENSC_WRAPPERS_FCNTL 1
+#define ENSC_WRAPPERS_SOCKET 1
+#define ENSC_WRAPPERS_IOSOCK 1
+#include <wrappers.h>
+
+#define CMD_HELP 0x1000
+#define CMD_VERSION 0x1001
+#define CMD_XID 0x4000
+#define CMD_CREATE 0x4001
+#define CMD_MIGRATE 0x4003
+#define CMD_INITPID 0x4002
+#define CMD_DISCONNECT 0x4004
+#define CMD_UID 0x4005
+#define CMD_CHROOT 0x4006
+#define CMD_SILENT 0x4007
+#define CMD_SYNCSOCK 0x4008
+#define CMD_SYNCMSG 0x4009
+#define CMD_MIGRATESELF 0x400a
+#define CMD_ENDSETUP 0x400b
+#define CMD_SILENTEXIST 0x400c
+#define CMD_NAMESPACE 0x400d
+#define CMD_PERSTYPE 0x400e
+#define CMD_PERSFLAG 0x400f
+
+
+struct option const
+CMDLINE_OPTIONS[] = {
+ { "help", no_argument, 0, CMD_HELP },
+ { "version", no_argument, 0, CMD_VERSION },
+ { "ctx", required_argument, 0, CMD_XID },
+ { "xid", required_argument, 0, CMD_XID },
+ { "create", no_argument, 0, CMD_CREATE },
+ { "migrate", no_argument, 0, CMD_MIGRATE },
+ { "migrate-self", no_argument, 0, CMD_MIGRATESELF },
+ { "initpid", no_argument, 0, CMD_INITPID },
+ { "endsetup", no_argument, 0, CMD_ENDSETUP },
+ { "disconnect", no_argument, 0, CMD_DISCONNECT },
+ { "silent", no_argument, 0, CMD_SILENT },
+ { "silentexist", no_argument, 0, CMD_SILENTEXIST },
+ { "uid", required_argument, 0, CMD_UID },
+ { "chroot", no_argument, 0, CMD_CHROOT },
+ { "namespace", no_argument, 0, CMD_NAMESPACE },
+ { "syncsock", required_argument, 0, CMD_SYNCSOCK },
+ { "syncmsg", required_argument, 0, CMD_SYNCMSG },
+ { "personality-type", required_argument, 0, CMD_PERSTYPE },
+ { "personality-flags", required_argument, 0, CMD_PERSFLAG },
+#if 1
+ { "fakeinit", no_argument, 0, CMD_INITPID }, // compatibility
+#endif
+ { 0,0,0,0 },
+};
+
+struct Arguments {
+ bool do_create;
+ bool do_migrate;
+ bool do_migrateself;
+ bool do_disconnect;
+ bool do_endsetup;
+ bool is_initpid;
+ bool is_silentexist;
+ bool set_namespace;
+ uint_least32_t personality_flags;
+ uint_least32_t personality_type;
+ int verbosity;
+ bool do_chroot;
+ uid_t uid;
+ xid_t xid;
+ char const * sync_sock;
+ char const * sync_msg;
+};
+
+int wrapper_exit_code = 255;
+
+static void
+showHelp(int fd, char const *cmd, int res)
+{
+ WRITE_MSG(fd, "Usage:\n ");
+ WRITE_STR(fd, cmd);
+ WRITE_MSG(fd,
+ " --create [--xid <xid>] <opts>* [--] <program> <args>*\n ");
+ WRITE_STR(fd, cmd);
+ WRITE_MSG(fd,
+ " [(--migrate --xid <xid>)|--migrate-self] <opts>* [--] <program> <args>*\n"
+ "\n"
+ "<opts> can be:\n"
+ " --chroot ... chroot into current directory\n"
+ " --namespace ... execute namespace management operations\n"
+ " --uid <uid> ... change uid\n"
+ " --initpid ... set current process as general process reaper\n"
+ " for ctx (possible for --migrate only)\n"
+ " --endsetup ... clear the setup flag; usefully for migrate only\n"
+ " --disconnect ... start program in background\n"
+ " --personality-type <type>\n"
+ " ... execute <program> in the given execution domain\n"
+ " --personality-flags <flags>+\n"
+ " ... set special flags for the given execution domain\n"
+ " --silent ... be silent\n"
+ " --silentexist ... be silent when context exists already; usefully\n"
+ " for '--create' only\n"
+ " --syncsock <file-name>\n"
+ " ... before executing the program, send a message\n"
+ " to the socket and wait until it closes.\n"
+ " <file-name> must be a SOCK_STREAM unix socket\n"
+ " --syncmsg <message>\n"
+ " ... use <message> as synchronization message; by\n"
+ " default, 'ok' will be used\n"
+ "\n"
+ "'vcontext --create' exits with code 254 iff the context exists already.\n"
+ "\n"
+ "Please report bugs to " PACKAGE_BUGREPORT "\n");
+
+ exit(res);
+}
+
+static void
+showVersion()
+{
+ WRITE_MSG(1,
+ "vcontext " VERSION " -- manages the creation of security contexts\n"
+ "This program is part of " PACKAGE_STRING "\n\n"
+ "Copyright (C) 2004 Enrico Scholz\n"
+ VERSION_COPYRIGHT_DISCLAIMER);
+ exit(0);
+}
+
+#include "context-sync.hc"
+
+static inline ALWAYSINLINE void
+tellContext(xid_t ctx, bool do_it)
+{
+ char buf[sizeof(xid_t)*3+2];
+ size_t l;
+
+ if (!do_it) return;
+
+ l = utilvserver_fmt_long(buf,ctx);
+
+ WRITE_MSG(1, "New security context is ");
+ Vwrite (1, buf, l);
+ WRITE_MSG(1, "\n");
+}
+
+static int
+connectExternalSync(char const *filename)
+{
+ int fd;
+ struct sockaddr_un addr;
+
+ if (filename==0) return -1;
+
+ ENSC_INIT_UNIX_SOCK(addr, filename);
+
+ fd = Esocket(PF_UNIX, SOCK_STREAM, 0);
+ Econnect(fd, &addr, sizeof(addr));
+
+ return fd;
+}
+
+static void
+setFlags(struct Arguments const *args, xid_t xid)
+{
+ struct vc_ctx_flags flags = { 0,0 };
+
+ if (args->is_initpid)
+ flags.mask |= VC_VXF_STATE_INIT;
+
+ if (args->do_endsetup)
+ flags.mask |= VC_VXF_STATE_SETUP;
+
+ if (flags.mask!=0) {
+ DPRINTF("set_flags: mask=%08llx, flag=%08llx\n", flags.mask, flags.flagword);
+ Evc_set_cflags(xid, &flags);
+ }
+}
+
+static void
+doExternalSync(int fd, char const *msg)
+{
+ char c;
+
+ if (fd==-1) return;
+
+ if (msg) EsendAll(fd, msg, strlen(msg));
+ Eshutdown(fd, SHUT_WR);
+
+ if (TEMP_FAILURE_RETRY(recv(fd, &c, 1, MSG_NOSIGNAL))!=0) {
+ WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "unexpected external synchronization event\n");
+ exit(wrapper_exit_code);
+ }
+
+ Eclose(fd);
+}
+
+static inline ALWAYSINLINE int
+doit(struct Arguments const *args, char *argv[])
+{
+ int p[2][2];
+ pid_t pid = initSync(p, args->do_disconnect);
+
+ if (pid==0) {
+ xid_t xid;
+ int ext_sync_fd = connectExternalSync(args->sync_sock);
+
+ doSyncStage0(p, args->do_disconnect);
+
+ if (args->do_create) {
+ xid = vc_ctx_create(args->xid);
+ if (xid==VC_NOCTX) {
+ switch (errno) {
+ case EEXIST :
+ if (!args->is_silentexist)
+ perror(ENSC_WRAPPERS_PREFIX "vc_create_context()");
+ return 254;
+ default :
+ perror(ENSC_WRAPPERS_PREFIX "vc_create_context()");
+ return wrapper_exit_code;
+ }
+ }
+ tellContext(xid, args->verbosity>=1);
+ }
+ else
+ xid = args->xid;
+
+ if (args->do_chroot) {
+ Echroot(".");
+ if (args->set_namespace) {
+ if (args->do_migrateself) Evc_set_namespace();
+ else if (args->do_migrate) Evc_enter_namespace(xid);
+ }
+ }
+
+ setFlags(args, xid);
+
+ if (args->do_migrate && !args->do_migrateself)
+ Evc_ctx_migrate(xid);
+
+ if (args->uid!=(uid_t)(-1) && getuid()!=args->uid) {
+ Esetuid(args->uid);
+ if (getuid()!=args->uid) {
+ WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "Something went wrong while changing the UID\n");
+ exit(wrapper_exit_code);
+ }
+ }
+
+ if (args->personality_type!=VC_BAD_PERSONALITY &&
+ sys_personality(args->personality_type | args->personality_flags)==-1) {
+ perror(ENSC_WRAPPERS_PREFIX "personality()");
+ exit(wrapper_exit_code);
+ }
+
+ doExternalSync(ext_sync_fd, args->sync_msg);
+ doSyncStage1(p, args->do_disconnect);
+ DPRINTF("doit: pid=%u, ppid=%u\n", getpid(), getppid());
+ execvp (argv[optind],argv+optind);
+ doSyncStage2(p, args->do_disconnect);
+
+ PERROR_Q(ENSC_WRAPPERS_PREFIX "execvp", argv[optind]);
+ exit(wrapper_exit_code);
+ }
+
+ assert(args->do_disconnect);
+
+ waitOnSync(pid, p, args->xid!=VC_DYNAMIC_XID && args->do_migrate);
+ return EXIT_SUCCESS;
+}
+
+static uint_least32_t
+parsePersonalityType(char const *str)
+{
+ uint_least32_t res = vc_str2personalitytype(str, 0);
+ if (res==VC_BAD_PERSONALITY) {
+ WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "bad personality type\n");
+ exit(wrapper_exit_code);
+ }
+
+ return res;
+}
+
+static uint_least32_t
+parsePersonalityFlags(char const *str)
+{
+ struct vc_err_listparser err;
+ uint_least32_t res;
+
+ if (vc_list2personalityflag(str, 0, &res, &err)==-1) {
+ WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "bad personality flag '");
+ Vwrite(2, err.ptr, err.len);
+ WRITE_MSG(2, "'\n");
+ exit(wrapper_exit_code);
+ }
+
+ return res;
+}
+
+int main (int argc, char *argv[])
+{
+ struct Arguments args = {
+ .do_create = false,
+ .do_migrate = false,
+ .do_migrateself = false,
+ .do_disconnect = false,
+ .do_endsetup = false,
+ .is_initpid = false,
+ .is_silentexist = false,
+ .set_namespace = false,
+ .verbosity = 1,
+ .uid = -1,
+ .xid = VC_DYNAMIC_XID,
+ .personality_type = VC_BAD_PERSONALITY,
+ .personality_flags = 0,
+ .sync_msg = "ok",
+ };
+
+ while (1) {
+ int c = getopt_long(argc, argv, "+", CMDLINE_OPTIONS, 0);
+ if (c==-1) break;
+
+ switch (c) {
+ case CMD_HELP : showHelp(1, argv[0], 0);
+ case CMD_VERSION : showVersion();
+ case CMD_CREATE : args.do_create = true; break;
+ case CMD_MIGRATE : args.do_migrate = true; break;
+ case CMD_DISCONNECT : args.do_disconnect = true; break;
+ case CMD_ENDSETUP : args.do_endsetup = true; break;
+ case CMD_INITPID : args.is_initpid = true; break;
+ case CMD_CHROOT : args.do_chroot = true; break;
+ case CMD_NAMESPACE : args.set_namespace = true; break;
+ case CMD_SILENTEXIST : args.is_silentexist = true; break;
+ case CMD_SYNCSOCK : args.sync_sock = optarg; break;
+ case CMD_SYNCMSG : args.sync_msg = optarg; break;
+ case CMD_UID : args.uid = atol(optarg); break;
+ case CMD_XID : args.xid = Evc_xidopt2xid(optarg,true); break;
+ case CMD_SILENT : --args.verbosity; break;
+ case CMD_PERSTYPE :
+ args.personality_type = parsePersonalityType(optarg);
+ break;
+ case CMD_PERSFLAG :
+ args.personality_flags |= parsePersonalityFlags(optarg);
+ break;
+ case CMD_MIGRATESELF :
+ args.do_migrate = true;
+ args.do_migrateself = true;
+ break;
+
+ default :
+ WRITE_MSG(2, "Try '");
+ WRITE_STR(2, argv[0]);
+ WRITE_MSG(2, " --help\" for more information.\n");
+ return wrapper_exit_code;
+ break;
+ }
+ }
+
+ signal(SIGCHLD, SIG_DFL);
+
+ if (args.do_migrateself)
+ args.xid = Evc_get_task_xid(0);
+
+ if (!args.do_create && !args.do_migrate)
+ WRITE_MSG(2, "Neither '--create' nor '--migrate specified; try '--help' for more information\n");
+ else if (args.do_create && args.do_migrate)
+ WRITE_MSG(2, "Can not specify '--create' and '--migrate' at the same time; try '--help' for more information\n");
+ else if (!args.do_migrate && args.is_initpid)
+ WRITE_MSG(2, "'--initpid' is possible in combination with '--migrate' only\n");
+ else if (!args.do_create && args.xid==VC_DYNAMIC_XID)
+ WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "Can not migrate to an unknown context\n");
+ else if (optind>=argc)
+ WRITE_MSG(2, "No command given; use '--help' for more information.\n");
+ else
+ return doit(&args, argv);
+
+ return wrapper_exit_code;
+}
git://git.onelab.eu / util-vserver.git / blobdiff