mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-07-11 04:15:49 +00:00
e7db227810
Take setlocale/gettext error handling pattern from tools/virsh-* and use it for all standalone binaries via a new shared virGettextInitialize routine. The virsh* pattern differed slightly from other callers. All users now consistently: * Ignore setlocale errors. virsh has done this forever, presumably for good reason. This has been partially responsible for some bug reports: https://bugzilla.redhat.com/show_bug.cgi?id=1312688 https://bugzilla.redhat.com/show_bug.cgi?id=1026514 https://bugzilla.redhat.com/show_bug.cgi?id=1016158 * Report the failed function name * Report strerror
356 lines
9.6 KiB
C
356 lines
9.6 KiB
C
/*
|
|
* virt-login-shell.c: a shell to connect to a container
|
|
*
|
|
* Copyright (C) 2013-2014 Red Hat, Inc.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library. If not, see
|
|
* <http://www.gnu.org/licenses/>.
|
|
*
|
|
* Daniel Walsh <dwalsh@redhat.com>
|
|
*/
|
|
#include <config.h>
|
|
|
|
#include <errno.h>
|
|
#include <fnmatch.h>
|
|
#include <getopt.h>
|
|
#include <signal.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#include "internal.h"
|
|
#include "virerror.h"
|
|
#include "virconf.h"
|
|
#include "virutil.h"
|
|
#include "virfile.h"
|
|
#include "virprocess.h"
|
|
#include "configmake.h"
|
|
#include "virstring.h"
|
|
#include "viralloc.h"
|
|
#include "vircommand.h"
|
|
#include "virgettext.h"
|
|
#define VIR_FROM_THIS VIR_FROM_NONE
|
|
|
|
static const char *conf_file = SYSCONFDIR "/libvirt/virt-login-shell.conf";
|
|
|
|
static int virLoginShellAllowedUser(virConfPtr conf,
|
|
const char *name,
|
|
gid_t *groups)
|
|
{
|
|
virConfValuePtr p;
|
|
int ret = -1;
|
|
char *ptr = NULL;
|
|
size_t i;
|
|
char *gname = NULL;
|
|
|
|
p = virConfGetValue(conf, "allowed_users");
|
|
if (p && p->type == VIR_CONF_LIST) {
|
|
virConfValuePtr pp;
|
|
|
|
/* Calc length and check items */
|
|
for (pp = p->list; pp; pp = pp->next) {
|
|
if (pp->type != VIR_CONF_STRING) {
|
|
virReportSystemError(EINVAL, "%s",
|
|
_("shell must be a list of strings"));
|
|
goto cleanup;
|
|
} else {
|
|
/*
|
|
If string begins with a % this indicates a linux group.
|
|
Check to see if the user is in the Linux Group.
|
|
*/
|
|
if (pp->str[0] == '%') {
|
|
ptr = &pp->str[1];
|
|
if (!*ptr)
|
|
continue;
|
|
for (i = 0; groups[i]; i++) {
|
|
if (!(gname = virGetGroupName(groups[i])))
|
|
continue;
|
|
if (fnmatch(ptr, gname, 0) == 0) {
|
|
ret = 0;
|
|
goto cleanup;
|
|
}
|
|
VIR_FREE(gname);
|
|
}
|
|
continue;
|
|
}
|
|
if (fnmatch(pp->str, name, 0) == 0) {
|
|
ret = 0;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
virReportSystemError(EPERM,
|
|
_("%s not matched against 'allowed_users' in %s"),
|
|
name, conf_file);
|
|
cleanup:
|
|
VIR_FREE(gname);
|
|
return ret;
|
|
}
|
|
|
|
static char **virLoginShellGetShellArgv(virConfPtr conf)
|
|
{
|
|
size_t i;
|
|
char **shargv = NULL;
|
|
virConfValuePtr p;
|
|
|
|
p = virConfGetValue(conf, "shell");
|
|
if (!p)
|
|
return virStringSplit("/bin/sh -l", " ", 3);
|
|
|
|
if (p->type == VIR_CONF_LIST) {
|
|
size_t len;
|
|
virConfValuePtr pp;
|
|
|
|
/* Calc length and check items */
|
|
for (len = 0, pp = p->list; pp; len++, pp = pp->next) {
|
|
if (pp->type != VIR_CONF_STRING) {
|
|
virReportSystemError(EINVAL, "%s",
|
|
_("shell must be a list of strings"));
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
if (VIR_ALLOC_N(shargv, len + 1) < 0)
|
|
goto error;
|
|
for (i = 0, pp = p->list; pp; i++, pp = pp->next) {
|
|
if (VIR_STRDUP(shargv[i], pp->str) < 0)
|
|
goto error;
|
|
}
|
|
}
|
|
return shargv;
|
|
error:
|
|
virStringFreeList(shargv);
|
|
return NULL;
|
|
}
|
|
|
|
static char *progname;
|
|
|
|
/*
|
|
* Print usage
|
|
*/
|
|
static void
|
|
usage(void)
|
|
{
|
|
fprintf(stdout,
|
|
_("\n"
|
|
"Usage:\n"
|
|
" %s [option]\n\n"
|
|
"Options:\n"
|
|
" -h | --help Display program help\n"
|
|
" -V | --version Display program version\n"
|
|
"\n"
|
|
"libvirt login shell\n"),
|
|
progname);
|
|
return;
|
|
}
|
|
|
|
/* Display version information. */
|
|
static void
|
|
show_version(void)
|
|
{
|
|
printf("%s (%s) %s\n", progname, PACKAGE_NAME, PACKAGE_VERSION);
|
|
}
|
|
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
virConfPtr conf = NULL;
|
|
const char *login_shell_path = conf_file;
|
|
pid_t cpid = -1;
|
|
int ret = EXIT_CANCELED;
|
|
int status;
|
|
uid_t uid = getuid();
|
|
gid_t gid = getgid();
|
|
char *name = NULL;
|
|
char **shargv = NULL;
|
|
virSecurityModelPtr secmodel = NULL;
|
|
virSecurityLabelPtr seclabel = NULL;
|
|
virDomainPtr dom = NULL;
|
|
virConnectPtr conn = NULL;
|
|
char *homedir = NULL;
|
|
int arg;
|
|
int longindex = -1;
|
|
int ngroups;
|
|
gid_t *groups = NULL;
|
|
ssize_t nfdlist = 0;
|
|
int *fdlist = NULL;
|
|
int openmax;
|
|
size_t i;
|
|
|
|
struct option opt[] = {
|
|
{"help", no_argument, NULL, 'h'},
|
|
{"version", optional_argument, NULL, 'V'},
|
|
{NULL, 0, NULL, 0}
|
|
};
|
|
if (virInitialize() < 0) {
|
|
fprintf(stderr, _("Failed to initialize libvirt error handling"));
|
|
return EXIT_CANCELED;
|
|
}
|
|
|
|
setenv("PATH", "/bin:/usr/bin", 1);
|
|
|
|
virSetErrorFunc(NULL, NULL);
|
|
virSetErrorLogPriorityFunc(NULL);
|
|
|
|
progname = argv[0];
|
|
if (virGettextInitialize() < 0)
|
|
return ret;
|
|
|
|
while ((arg = getopt_long(argc, argv, "hV", opt, &longindex)) != -1) {
|
|
switch (arg) {
|
|
case 'h':
|
|
usage();
|
|
exit(EXIT_SUCCESS);
|
|
|
|
case 'V':
|
|
show_version();
|
|
exit(EXIT_SUCCESS);
|
|
|
|
case '?':
|
|
default:
|
|
usage();
|
|
exit(EXIT_CANCELED);
|
|
}
|
|
}
|
|
|
|
if (argc > optind) {
|
|
virReportSystemError(EINVAL, _("%s takes no options"), progname);
|
|
goto cleanup;
|
|
}
|
|
|
|
if (uid == 0) {
|
|
virReportSystemError(EPERM, _("%s must be run by non root users"),
|
|
progname);
|
|
goto cleanup;
|
|
}
|
|
|
|
name = virGetUserName(uid);
|
|
if (!name)
|
|
goto cleanup;
|
|
|
|
homedir = virGetUserDirectoryByUID(uid);
|
|
if (!homedir)
|
|
goto cleanup;
|
|
|
|
if (!(conf = virConfReadFile(login_shell_path, 0)))
|
|
goto cleanup;
|
|
|
|
if ((ngroups = virGetGroupList(uid, gid, &groups)) < 0)
|
|
goto cleanup;
|
|
|
|
if (virLoginShellAllowedUser(conf, name, groups) < 0)
|
|
goto cleanup;
|
|
|
|
if (!(shargv = virLoginShellGetShellArgv(conf)))
|
|
goto cleanup;
|
|
|
|
conn = virConnectOpen("lxc:///");
|
|
if (!conn)
|
|
goto cleanup;
|
|
|
|
dom = virDomainLookupByName(conn, name);
|
|
if (!dom)
|
|
goto cleanup;
|
|
|
|
if (!virDomainIsActive(dom) && virDomainCreate(dom) < 0) {
|
|
virErrorPtr last_error;
|
|
last_error = virGetLastError();
|
|
if (last_error->code != VIR_ERR_OPERATION_INVALID) {
|
|
virReportSystemError(last_error->code,
|
|
_("Can't create %s container: %s"),
|
|
name, last_error->message);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
openmax = sysconf(_SC_OPEN_MAX);
|
|
if (openmax < 0) {
|
|
virReportSystemError(errno, "%s",
|
|
_("sysconf(_SC_OPEN_MAX) failed"));
|
|
goto cleanup;
|
|
}
|
|
|
|
if ((nfdlist = virDomainLxcOpenNamespace(dom, &fdlist, 0)) < 0)
|
|
goto cleanup;
|
|
if (VIR_ALLOC(secmodel) < 0)
|
|
goto cleanup;
|
|
if (VIR_ALLOC(seclabel) < 0)
|
|
goto cleanup;
|
|
if (virNodeGetSecurityModel(conn, secmodel) < 0)
|
|
goto cleanup;
|
|
if (virDomainGetSecurityLabel(dom, seclabel) < 0)
|
|
goto cleanup;
|
|
if (virSetUIDGID(0, 0, NULL, 0) < 0)
|
|
goto cleanup;
|
|
if (virDomainLxcEnterSecurityLabel(secmodel, seclabel, NULL, 0) < 0)
|
|
goto cleanup;
|
|
if (nfdlist > 0 &&
|
|
virDomainLxcEnterNamespace(dom, nfdlist, fdlist, NULL, NULL, 0) < 0)
|
|
goto cleanup;
|
|
if (virSetUIDGID(uid, gid, groups, ngroups) < 0)
|
|
goto cleanup;
|
|
if (chdir(homedir) < 0) {
|
|
virReportSystemError(errno, _("Unable to chdir(%s)"), homedir);
|
|
goto cleanup;
|
|
}
|
|
|
|
/* A fork is required to create new process in correct pid namespace. */
|
|
if ((cpid = virFork()) < 0)
|
|
goto cleanup;
|
|
|
|
if (cpid == 0) {
|
|
int tmpfd;
|
|
|
|
for (i = 3; i < openmax; i++) {
|
|
tmpfd = i;
|
|
VIR_MASS_CLOSE(tmpfd);
|
|
}
|
|
if (execv(shargv[0], (char *const*) shargv) < 0) {
|
|
virReportSystemError(errno, _("Unable to exec shell %s"),
|
|
shargv[0]);
|
|
virDispatchError(NULL);
|
|
return errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE;
|
|
}
|
|
}
|
|
|
|
/* At this point, the parent is now waiting for the child to exit,
|
|
* but as that may take a long time, we release resources now. */
|
|
cleanup:
|
|
if (nfdlist > 0)
|
|
for (i = 0; i < nfdlist; i++)
|
|
VIR_FORCE_CLOSE(fdlist[i]);
|
|
VIR_FREE(fdlist);
|
|
virConfFree(conf);
|
|
if (dom)
|
|
virDomainFree(dom);
|
|
if (conn)
|
|
virConnectClose(conn);
|
|
virStringFreeList(shargv);
|
|
VIR_FREE(name);
|
|
VIR_FREE(homedir);
|
|
VIR_FREE(seclabel);
|
|
VIR_FREE(secmodel);
|
|
VIR_FREE(groups);
|
|
|
|
if (virProcessWait(cpid, &status, true) == 0)
|
|
virProcessExitWithStatus(status);
|
|
|
|
if (virGetLastError())
|
|
virDispatchError(NULL);
|
|
return ret;
|
|
}
|