#define _SUDO_MAIN
#ifdef __TANDEM
# include <floss.h>
#endif
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <sys/socket.h>
#ifdef HAVE_SETRLIMIT
# include <sys/time.h>
# include <sys/resource.h>
#endif
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif
#ifdef HAVE_STRING_H
# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
# include <memory.h>
# endif
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <pwd.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <grp.h>
#if TIME_WITH_SYS_TIME
# include <time.h>
#endif
#ifdef HAVE_SETLOCALE
# include <locale.h>
#endif
#include <netinet/in.h>
#include <netdb.h>
#if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
# ifdef __hpux
# undef MAXINT
# include <hpsecurity.h>
# else
# include <sys/security.h>
# endif
# include <prot.h>
#endif
#ifdef HAVE_LOGIN_CAP_H
# include <login_cap.h>
# ifndef LOGIN_DEFROOTCLASS
# define LOGIN_DEFROOTCLASS "daemon"
# endif
# ifndef LOGIN_SETENV
# define LOGIN_SETENV 0
# endif
#endif
#ifdef HAVE_MBR_CHECK_MEMBERSHIP
# include <membership.h>
#endif
#if defined(HAVE_STRUCT_KINFO_PROC_P_TDEV) || defined (HAVE_STRUCT_KINFO_PROC_KP_EPROC_E_TDEV)
# include <sys/sysctl.h>
#else
# if defined(HAVE_STRUCT_KINFO_PROC_KI_TDEV)
# include <sys/sysctl.h>
# include <sys/user.h>
# endif
#endif
#include "sudo.h"
#include "lbuf.h"
#include "interfaces.h"
#include "secure_path.h"
#include "sudo_usage.h"
#ifdef USING_NONUNIX_GROUPS
# include "nonunix.h"
#endif
#if defined(HAVE_PAM) && !defined(NO_PAM_SESSION)
# define CMND_WAIT TRUE
#else
# define CMND_WAIT FALSE
#endif
static void init_vars __P((char **));
static int set_cmnd __P((int));
static void initial_setup __P((void));
static void set_loginclass __P((struct passwd *));
static void set_runaspw __P((const char *));
static void set_runasgr __P((const char *));
static int cb_runas_default __P((const char *));
static void show_version __P((void));
static void create_admin_success_flag __P((void));
extern int sudo_edit __P((int, char **, char **));
int run_command __P((const char *path, char *argv[], char *envp[], uid_t uid, int dowait));
static void sudo_check_suid __P((const char *path));
int Argc, NewArgc;
char **Argv, **NewArgv;
char *prev_user;
int user_closefrom = -1;
struct sudo_user sudo_user;
struct passwd *list_pw;
struct interface *interfaces;
int num_interfaces;
int tgetpass_flags;
int long_list;
uid_t timestamp_uid;
extern int errorlineno;
extern int parse_error;
extern char *errorfile;
#if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
static struct rlimit corelimit;
#endif
#if defined(__linux__)
static struct rlimit nproclimit;
#endif
#ifdef HAVE_LOGIN_CAP_H
login_cap_t *lc;
#endif
sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
char *runas_user;
char *runas_group;
static struct sudo_nss_list *snl;
int sudo_mode;
extern char *optarg;
extern int optind;
int
main(argc, argv, envp)
int argc;
char *argv[];
char *envp[];
{
int sources = 0, validated;
int fd, cmnd_status, pwflag, rval = TRUE;
sigaction_t sa;
struct sudo_nss *nss;
#if defined(SUDO_DEVEL) && defined(__OpenBSD__)
extern char *malloc_options;
malloc_options = "AFGJPR";
#endif
#ifdef HAVE_SETLOCALE
setlocale(LC_ALL, "");
#endif
Argv = argv;
if ((Argc = argc) < 1)
usage(1);
#if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
(void) set_auth_parameters(Argc, Argv);
# ifdef HAVE_INITPRIVS
initprivs();
# endif
#endif
sudo_check_suid(argv[0]);
save_signals();
zero_bytes(&sa, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sa.sa_handler = SIG_IGN;
(void) sigaction(SIGINT, &sa, &saved_sa_int);
(void) sigaction(SIGQUIT, &sa, &saved_sa_quit);
(void) sigaction(SIGTSTP, &sa, &saved_sa_tstp);
env_init(FALSE);
initial_setup();
sudo_setpwent();
sudo_setgrent();
sudo_mode = parse_args(Argc, Argv);
init_defaults();
load_interfaces();
pwflag = 0;
if (ISSET(sudo_mode, MODE_SHELL))
user_cmnd = "shell";
else if (ISSET(sudo_mode, MODE_EDIT))
user_cmnd = "sudoedit";
else {
switch (sudo_mode & MODE_MASK) {
case MODE_VERSION:
show_version();
break;
case MODE_HELP:
help();
break;
case MODE_VALIDATE:
case MODE_VALIDATE|MODE_INVALIDATE:
user_cmnd = "validate";
pwflag = I_VERIFYPW;
break;
case MODE_KILL:
case MODE_INVALIDATE:
user_cmnd = "kill";
pwflag = -1;
break;
case MODE_LISTDEFS:
list_options();
goto done;
break;
case MODE_LIST:
case MODE_LIST|MODE_INVALIDATE:
user_cmnd = "list";
pwflag = I_LISTPW;
break;
case MODE_CHECK:
case MODE_CHECK|MODE_INVALIDATE:
pwflag = I_LISTPW;
break;
}
}
if (user_cmnd == NULL && NewArgc == 0)
usage(1);
init_vars(envp);
#ifdef USING_NONUNIX_GROUPS
sudo_nonunix_groupcheck_init();
#endif
snl = sudo_read_nss();
tq_foreach_fwd(snl, nss) {
if (nss->open(nss) == 0 && nss->parse(nss) == 0) {
sources++;
if (nss->setdefs(nss) != 0)
log_error(NO_STDERR, "problem with defaults entries");
}
}
if (sources == 0)
log_fatal(0, "no valid sudoers sources found, quitting");
if (runas_group != NULL) {
set_runasgr(runas_group);
if (runas_user != NULL)
set_runaspw(runas_user);
} else
set_runaspw(runas_user ? runas_user : def_runas_default);
if (!update_defaults(SETDEF_RUNAS))
log_error(NO_STDERR, "problem with defaults entries");
if (def_fqdn)
set_fqdn();
set_loginclass(runas_pw ? runas_pw : sudo_user.pw);
if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
NewArgv[0] = estrdup(runas_pw->pw_shell);
if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) {
remove_timestamp((sudo_mode == MODE_KILL));
goto done;
}
if (user_uid == 0 && !def_root_sudo) {
(void) fprintf(stderr,
"Sorry, %s has been configured to not allow root to run it.\n",
getprogname());
goto bad;
}
if (user_closefrom >= 0 && user_closefrom != def_closefrom) {
if (!def_closefrom_override) {
warningx("you are not permitted to use the -C option");
goto bad;
}
def_closefrom = user_closefrom;
}
if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
def_preserve_groups = TRUE;
cmnd_status = set_cmnd(sudo_mode);
#ifdef HAVE_SETLOCALE
if (!setlocale(LC_ALL, def_sudoers_locale)) {
warningx("unable to set locale to \"%s\", using \"C\"",
def_sudoers_locale);
setlocale(LC_ALL, "C");
}
#endif
validated = FLAG_NO_USER | FLAG_NO_HOST;
tq_foreach_fwd(snl, nss) {
validated = nss->lookup(nss, validated, pwflag);
if (ISSET(validated, VALIDATE_OK)) {
if (nss->ret_if_found)
break;
} else {
if (nss->ret_if_notfound)
break;
}
}
if (safe_cmnd == NULL)
safe_cmnd = estrdup(user_cmnd);
#ifdef HAVE_SETLOCALE
setlocale(LC_ALL, "");
#endif
if (runas_pw == NULL)
set_runaspw(user_name);
if (def_timestampowner) {
struct passwd *pw;
if (*def_timestampowner == '#')
pw = sudo_getpwuid(atoi(def_timestampowner + 1));
else
pw = sudo_getpwnam(def_timestampowner);
if (pw != NULL) {
timestamp_uid = pw->pw_uid;
pw_delref(pw);
} else {
log_error(0, "timestamp owner (%s): No such user",
def_timestampowner);
timestamp_uid = ROOT_UID;
}
}
if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs)
usage(1);
if (def_requiretty) {
if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
audit_failure(NewArgv, "no tty");
log_fatal(NO_MAIL, "sorry, you must have a tty to run sudo");
} else
(void) close(fd);
}
if (def_askpass && !user_askpass)
user_askpass = def_askpass;
if (ISSET(sudo_mode, MODE_EDIT) ||
(ISSET(sudo_mode, MODE_PRESERVE_ENV) && def_setenv))
def_env_reset = FALSE;
rebuild_env(def_noexec);
rval = check_user(validated, sudo_mode);
if (rval != TRUE) {
if (!ISSET(validated, VALIDATE_OK))
log_denial(validated, FALSE);
goto done;
}
if (sudo_mode & (MODE_RUN | MODE_EDIT) && prev_user != NULL) {
if (user_uid == 0 && strcmp(prev_user, "root") != 0) {
struct passwd *pw;
if ((pw = sudo_getpwnam(prev_user)) != NULL) {
if (sudo_user.pw != NULL)
pw_delref(sudo_user.pw);
sudo_user.pw = pw;
#ifdef HAVE_MBR_CHECK_MEMBERSHIP
mbr_uid_to_uuid(user_uid, user_uuid);
#endif
}
}
}
if (!ISSET(validated, VALIDATE_OK)) {
log_failure(validated, cmnd_status);
goto bad;
}
create_admin_success_flag();
if (cmnd_status == NOT_FOUND_DOT) {
audit_failure(NewArgv, "command in current directory");
warningx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
goto bad;
} else if (cmnd_status == NOT_FOUND) {
audit_failure(NewArgv, "%s: command not found", user_cmnd);
warningx("%s: command not found", user_cmnd);
goto bad;
}
if (ISSET(sudo_mode, MODE_RUN) && !def_setenv) {
if (ISSET(sudo_mode, MODE_PRESERVE_ENV)) {
warningx("sorry, you are not allowed to preserve the environment");
goto bad;
} else
validate_env_vars(sudo_user.env_vars);
}
#ifdef _PATH_SUDO_IO_LOGDIR
if (ISSET(sudo_mode, (MODE_RUN | MODE_EDIT)) && (def_log_input || def_log_output))
io_nextid();
#endif
log_allowed(validated);
if (ISSET(sudo_mode, MODE_CHECK))
rval = display_cmnd(snl, list_pw ? list_pw : sudo_user.pw);
else if (ISSET(sudo_mode, MODE_LIST))
display_privs(snl, list_pw ? list_pw : sudo_user.pw);
tq_foreach_fwd(snl, nss) {
nss->close(nss);
}
#ifdef USING_NONUNIX_GROUPS
sudo_nonunix_groupcheck_cleanup();
#endif
if (ISSET(sudo_mode, (MODE_VALIDATE|MODE_CHECK|MODE_LIST))) {
goto done;
}
audit_success(NewArgv);
if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
char *p;
if ((p = strrchr(NewArgv[0], '/')) == NULL)
p = NewArgv[0];
*p = '-';
NewArgv[0] = p;
if (NewArgc > 1 && strcmp(NewArgv[0], "-bash") == 0) {
NewArgv--;
NewArgc++;
NewArgv[0] = NewArgv[1];
NewArgv[1] = "--login";
}
#if defined(_AIX) || (defined(__linux__) && !defined(HAVE_PAM))
read_env_file(_PATH_ENVIRONMENT, TRUE);
#endif
#ifdef HAVE_LOGIN_CAP_H
if (login_class) {
login_cap_t *lc = login_getclass(login_class);
if (lc != NULL) {
setusercontext(lc, runas_pw, runas_pw->pw_uid,
LOGIN_SETPATH|LOGIN_SETENV);
login_close(lc);
}
}
#endif
}
if (ISSET(sudo_mode, MODE_RUN)) {
if (def_env_file)
read_env_file(def_env_file, FALSE);
insert_env_vars(sudo_user.env_vars);
}
(void) sigaction(SIGINT, &saved_sa_int, NULL);
(void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
(void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
if (ISSET(sudo_mode, MODE_EDIT)) {
exit(sudo_edit(NewArgc, NewArgv, envp));
} else {
exit(run_command(safe_cmnd, NewArgv, env_get(), runas_pw->pw_uid,
CMND_WAIT));
}
bad:
rval = FALSE;
done:
cleanup(0);
exit(!rval);
}
static void
init_vars(envp)
char **envp;
{
char *p, **ep, thost[MAXHOSTNAMELEN + 1];
int nohostname;
if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX) {
audit_failure(NULL, "pathname too long");
errorx(1, "%s: File name too long", NewArgv[0]);
}
#ifdef HAVE_TZSET
(void) tzset();
#endif
if (user_cmnd == NULL)
user_cmnd = NewArgv[0];
(void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
nohostname = gethostname(thost, sizeof(thost));
if (nohostname) {
user_host = user_shost = "localhost";
} else {
thost[sizeof(thost) - 1] = '\0';
user_host = estrdup(thost);
if ((p = strchr(user_host, '.'))) {
*p = '\0';
user_shost = estrdup(user_host);
*p = '.';
} else {
user_shost = user_host;
}
}
if ((p = get_process_ttyname()) != NULL) {
user_tty = user_ttypath = p;
if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
user_tty += sizeof(_PATH_DEV) - 1;
} else
user_tty = "unknown";
for (ep = envp; *ep; ep++) {
switch (**ep) {
case 'D':
if (strncmp("DISPLAY=", *ep, 8) == 0)
user_display = *ep + 8;
break;
case 'K':
if (strncmp("KRB5CCNAME=", *ep, 11) == 0)
user_ccname = *ep + 11;
break;
case 'P':
if (strncmp("PATH=", *ep, 5) == 0)
user_path = *ep + 5;
break;
case 'S':
if (strncmp("SHELL=", *ep, 6) == 0)
user_shell = *ep + 6;
else if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0)
user_prompt = *ep + 12;
else if (strncmp("SUDO_USER=", *ep, 10) == 0)
prev_user = *ep + 10;
else if (strncmp("SUDO_ASKPASS=", *ep, 13) == 0)
user_askpass = *ep + 13;
break;
}
}
if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL) {
uid_t uid = getuid();
gid_t gid = getgid();
if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE)
errorx(1, "unknown uid: %u", (unsigned int) uid);
sudo_user.pw = sudo_fakepwuid(uid, gid);
log_fatal(0, "unknown uid: %u", (unsigned int) uid);
}
#ifdef HAVE_MBR_CHECK_MEMBERSHIP
mbr_uid_to_uuid(user_uid, user_uuid);
#endif
#ifdef HAVE_GETSID
user_sid = getsid(0);
#endif
if (user_shell == NULL || *user_shell == '\0')
user_shell = estrdup(sudo_user.pw->pw_shell);
#ifdef HAVE_GETGROUPS
if ((user_ngroups = getgroups(0, NULL)) > 0) {
user_groups = emalloc2(user_ngroups, sizeof(GETGROUPS_T));
if (getgroups(user_ngroups, user_groups) < 0)
log_fatal(USE_ERRNO|MSG_ONLY, "can't get group vector");
}
#endif
if (nohostname)
log_fatal(USE_ERRNO|MSG_ONLY, "can't get hostname");
set_perms(PERM_USER);
if (!getcwd(user_cwd, sizeof(user_cwd))) {
set_perms(PERM_ROOT);
if (!getcwd(user_cwd, sizeof(user_cwd))) {
warningx("cannot get working directory");
(void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
}
} else
set_perms(PERM_ROOT);
if (ISSET(sudo_mode, MODE_SHELL)) {
char **av, *cmnd = NULL;
int ac = 1;
if (NewArgc > 0) {
char *src, *dst;
size_t cmnd_size = (size_t) (NewArgv[NewArgc - 1] - NewArgv[0]);
for (av = NewArgv; *av != NULL; av++)
cmnd_size += strlen(*av);
cmnd = dst = emalloc2(cmnd_size, 2);
for (av = NewArgv; *av != NULL; av++) {
for (src = *av; *src != '\0'; src++) {
*dst++ = *src;
}
*dst++ = ' ';
}
if (cmnd != dst)
dst--;
*dst = '\0';
ac += 2;
}
av = (char **) emalloc2(ac + 3, sizeof(char *));
av += 2;
av[0] = user_shell;
if (cmnd != NULL) {
av[1] = "-c";
av[2] = cmnd;
}
av[ac] = NULL;
NewArgv = av;
NewArgc = ac;
} else if (ISSET(sudo_mode, MODE_EDIT) || NewArgc == 0) {
NewArgv--;
NewArgc++;
NewArgv[0] = user_cmnd;
}
sudo_defs_table[I_RUNAS_DEFAULT].callback = cb_runas_default;
}
static int
set_cmnd(sudo_mode)
int sudo_mode;
{
int rval;
char *path = user_path;
rval = FOUND;
user_stat = ecalloc(1, sizeof(struct stat));
if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) {
if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) {
if (def_secure_path && !user_is_exempt())
path = def_secure_path;
set_perms(PERM_RUNAS);
rval = find_path(NewArgv[0], &user_cmnd, user_stat, path,
def_ignore_dot);
set_perms(PERM_ROOT);
if (rval != FOUND) {
set_perms(PERM_USER);
rval = find_path(NewArgv[0], &user_cmnd, user_stat, path,
def_ignore_dot);
set_perms(PERM_ROOT);
}
}
if (NewArgc > 1) {
char *to, *from, **av;
size_t size, n;
if (ISSET(sudo_mode, MODE_SHELL)) {
for (size = 0, av = NewArgv + 1; *av; av++)
size += strlen(*av) + 1;
user_args = emalloc(size);
for (to = user_args, av = NewArgv + 1; (from = *av); av++) {
while (*from) {
if (from[0] == '\\' && !isspace((unsigned char)from[1]))
from++;
*to++ = *from++;
}
*to++ = ' ';
}
*--to = '\0';
} else {
size = (size_t) (NewArgv[NewArgc - 1] - NewArgv[1]) +
strlen(NewArgv[NewArgc - 1]) + 1;
user_args = emalloc(size);
for (to = user_args, av = NewArgv + 1; *av; av++) {
n = strlcpy(to, *av, size - (to - user_args));
if (n >= size - (to - user_args))
errorx(1, "internal error, init_vars() overflow");
to += n;
*to++ = ' ';
}
*--to = '\0';
}
}
}
if ((user_base = strrchr(user_cmnd, '/')) != NULL)
user_base++;
else
user_base = user_cmnd;
if (!update_defaults(SETDEF_CMND))
log_error(NO_STDERR, "problem with defaults entries");
return rval;
}
int
exec_setup(rbac_enabled, ttyname, ttyfd)
int rbac_enabled;
const char *ttyname;
int ttyfd;
{
int rval = FALSE;
#ifdef HAVE_SELINUX
if (rbac_enabled) {
if (selinux_setup(user_role, user_type, ttyname, ttyfd) == -1)
goto done;
}
#endif
if (ISSET(sudo_mode, MODE_EDIT)) {
set_perms(PERM_FULL_USER);
rval = TRUE;
goto done;
}
if (def_umask != 0777) {
if (def_umask_override) {
umask(def_umask);
} else {
mode_t mask = umask(def_umask);
mask |= def_umask;
if (mask != def_umask)
umask(mask);
}
}
#if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
(void) setrlimit(RLIMIT_CORE, &corelimit);
#endif
if (ISSET(sudo_mode, MODE_RUN))
set_perms(PERM_FULL_RUNAS);
if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
if (chdir(runas_pw->pw_dir) == -1) {
warning("unable to change directory to %s", runas_pw->pw_dir);
goto done;
}
}
#if defined(__linux__)
{
struct rlimit rl;
if (getrlimit(RLIMIT_NPROC, &rl) == 0) {
if (rl.rlim_cur == RLIM_INFINITY && rl.rlim_max == RLIM_INFINITY)
(void) setrlimit(RLIMIT_NPROC, &nproclimit);
}
}
#endif
sudo_endpwent();
sudo_endgrent();
pw_delref(sudo_user.pw);
pw_delref(runas_pw);
if (runas_gr != NULL)
gr_delref(runas_gr);
rval = TRUE;
done:
return rval;
}
int
run_command(path, argv, envp, uid, dowait)
const char *path;
char *argv[];
char *envp[];
uid_t uid;
int dowait;
{
struct command_status cstat;
int exitcode = 1;
#ifdef PROFILING
exit(0);
#endif
cstat.type = CMD_INVALID;
cstat.val = 0;
sudo_execve(path, argv, envp, uid, &cstat, dowait,
ISSET(sudo_mode, MODE_BACKGROUND));
switch (cstat.type) {
case CMD_ERRNO:
warningx("unable to execute %s: %s", path, strerror(cstat.val));
exitcode = 127;
break;
case CMD_WSTATUS:
if (WIFEXITED(cstat.val))
exitcode = WEXITSTATUS(cstat.val);
else if (WIFSIGNALED(cstat.val))
exitcode = WTERMSIG(cstat.val) | 128;
break;
default:
warningx("unexpected child termination condition: %d", cstat.type);
break;
}
#ifdef HAVE_PAM
pam_end_session(runas_pw);
#endif
#ifdef _PATH_SUDO_IO_LOGDIR
io_log_close();
#endif
sudo_endpwent();
sudo_endgrent();
pw_delref(sudo_user.pw);
pw_delref(runas_pw);
if (runas_gr != NULL)
gr_delref(runas_gr);
return exitcode;
}
FILE *
open_sudoers(sudoers, doedit, keepopen)
const char *sudoers;
int doedit;
int *keepopen;
{
struct stat sb;
FILE *fp = NULL;
set_perms(PERM_SUDOERS);
switch (sudo_secure_file(sudoers, SUDOERS_UID, SUDOERS_GID, &sb)) {
case SUDO_PATH_SECURE:
if (SUDOERS_UID == ROOT_UID && (SUDOERS_MODE & S_IRGRP)) {
if ((sb.st_mode & S_IRGRP) == 0)
set_perms(PERM_ROOT);
}
if ((fp = fopen(sudoers, "r")) == NULL) {
log_error(USE_ERRNO, "unable to open %s", sudoers);
} else {
if (sb.st_size != 0 && fgetc(fp) == EOF) {
log_error(USE_ERRNO, "unable to read %s",
sudoers);
fclose(fp);
fp = NULL;
} else {
rewind(fp);
(void) fcntl(fileno(fp), F_SETFD, 1);
}
}
break;
case SUDO_PATH_MISSING:
log_error(USE_ERRNO, "unable to stat %s", sudoers);
break;
case SUDO_PATH_BAD_TYPE:
log_error(0, "%s is not a regular file", sudoers);
break;
case SUDO_PATH_WRONG_OWNER:
log_error(0, "%s is owned by uid %u, should be %u",
sudoers, (unsigned int) sb.st_uid, (unsigned int) SUDOERS_UID);
break;
case SUDO_PATH_WORLD_WRITABLE:
log_error(0, "%s is world writable", sudoers);
break;
case SUDO_PATH_GROUP_WRITABLE:
log_error(0, "%s is owned by gid %u, should be %u",
sudoers, (unsigned int) sb.st_gid, (unsigned int) SUDOERS_GID);
break;
default:
break;
}
set_perms(PERM_ROOT);
return fp;
}
static void
sudo_check_suid(path)
const char *path;
{
struct stat sb;
if (geteuid() != 0) {
if (strchr(path, '/') != NULL && stat(path, &sb) == 0) {
if (sb.st_uid != ROOT_UID || !ISSET(sb.st_mode, S_ISUID)) {
errorx(1,
"%s must be owned by uid %d and have the setuid bit set",
path, ROOT_UID);
} else {
errorx(1, "effective uid is not %d, is %s on a file system with the 'nosuid' option set or an NFS file system without root privileges?", ROOT_UID, path);
}
} else {
errorx(1, "effective uid is not %d, is sudo installed setuid root?",
ROOT_UID);
}
}
}
static void
initial_setup()
{
int miss[3], devnull = -1;
sigset_t mask;
#if defined(__linux__) || (defined(RLIMIT_CORE) && !defined(SUDO_DEVEL))
struct rlimit rl;
#endif
(void) sigemptyset(&mask);
(void) sigprocmask(SIG_SETMASK, &mask, NULL);
#if defined(__linux__)
(void) getrlimit(RLIMIT_NPROC, &nproclimit);
rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
if (setrlimit(RLIMIT_NPROC, &rl)) {
memcpy(&rl, &nproclimit, sizeof(struct rlimit));
rl.rlim_cur = rl.rlim_max;
(void)setrlimit(RLIMIT_NPROC, &rl);
}
#endif
#if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
(void) getrlimit(RLIMIT_CORE, &corelimit);
memcpy(&rl, &corelimit, sizeof(struct rlimit));
rl.rlim_cur = 0;
(void) setrlimit(RLIMIT_CORE, &rl);
#endif
miss[STDIN_FILENO] = fcntl(STDIN_FILENO, F_GETFL, 0) == -1;
miss[STDOUT_FILENO] = fcntl(STDOUT_FILENO, F_GETFL, 0) == -1;
miss[STDERR_FILENO] = fcntl(STDERR_FILENO, F_GETFL, 0) == -1;
if (miss[STDIN_FILENO] || miss[STDOUT_FILENO] || miss[STDERR_FILENO]) {
if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0644)) == -1)
error(1, "unable to open %s", _PATH_DEVNULL);
if (miss[STDIN_FILENO] && dup2(devnull, STDIN_FILENO) == -1)
error(1, "dup2");
if (miss[STDOUT_FILENO] && dup2(devnull, STDOUT_FILENO) == -1)
error(1, "dup2");
if (miss[STDERR_FILENO] && dup2(devnull, STDERR_FILENO) == -1)
error(1, "dup2");
if (devnull > STDERR_FILENO)
close(devnull);
}
}
#ifdef HAVE_LOGIN_CAP_H
static void
set_loginclass(pw)
struct passwd *pw;
{
const int errflags = NO_MAIL|MSG_ONLY;
if (!def_use_loginclass)
return;
if (login_class && strcmp(login_class, "-") != 0) {
if (user_uid != 0 &&
strcmp(runas_user ? runas_user : def_runas_default, "root") != 0)
errorx(1, "only root can use -c %s", login_class);
} else {
login_class = pw->pw_class;
if (!login_class || !*login_class)
login_class =
(pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
}
lc = login_getclass(login_class);
if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
if (login_class)
log_fatal(errflags, "unknown login class: %s", login_class);
else
log_error(errflags, "unknown login class: %s", login_class);
def_use_loginclass = FALSE;
}
}
#else
static void
set_loginclass(pw)
struct passwd *pw;
{
}
#endif
#ifndef AI_FQDN
# define AI_FQDN AI_CANONNAME
#endif
void
set_fqdn()
{
#ifdef HAVE_GETADDRINFO
struct addrinfo *res0, hint;
#else
struct hostent *hp;
#endif
char *p;
#ifdef HAVE_GETADDRINFO
zero_bytes(&hint, sizeof(hint));
hint.ai_family = PF_UNSPEC;
hint.ai_flags = AI_FQDN;
if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
#else
if (!(hp = gethostbyname(user_host))) {
#endif
log_error(MSG_ONLY, "unable to resolve host %s", user_host);
} else {
if (user_shost != user_host)
efree(user_shost);
efree(user_host);
#ifdef HAVE_GETADDRINFO
user_host = estrdup(res0->ai_canonname);
freeaddrinfo(res0);
#else
user_host = estrdup(hp->h_name);
#endif
if ((p = strchr(user_host, '.'))) {
*p = '\0';
user_shost = estrdup(user_host);
*p = '.';
} else {
user_shost = user_host;
}
}
}
void
set_runaspw(user)
const char *user;
{
if (runas_pw != NULL)
pw_delref(runas_pw);
if (*user == '#') {
if ((runas_pw = sudo_getpwuid(atoi(user + 1))) == NULL)
runas_pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0);
} else {
if ((runas_pw = sudo_getpwnam(user)) == NULL) {
audit_failure(NewArgv, "unknown user: %s", user);
log_fatal(NO_MAIL|MSG_ONLY, "unknown user: %s", user);
}
}
}
static void
set_runasgr(group)
const char *group;
{
if (runas_gr != NULL)
gr_delref(runas_gr);
if (*group == '#') {
if ((runas_gr = sudo_getgrgid(atoi(group + 1))) == NULL)
runas_gr = sudo_fakegrnam(group);
} else {
if ((runas_gr = sudo_getgrnam(group)) == NULL)
log_fatal(NO_MAIL|MSG_ONLY, "unknown group: %s", group);
}
}
static int
cb_runas_default(user)
const char *user;
{
if (!runas_user && !runas_group)
set_runaspw(user);
return TRUE;
}
void
cleanup(gotsignal)
int gotsignal;
{
struct sudo_nss *nss;
if (!gotsignal) {
if (snl != NULL) {
tq_foreach_fwd(snl, nss)
nss->close(nss);
}
#ifdef USING_NONUNIX_GROUPS
sudo_nonunix_groupcheck_cleanup();
#endif
sudo_endpwent();
sudo_endgrent();
#ifdef _PATH_SUDO_IO_LOGDIR
io_log_close();
#endif
}
#ifdef _PATH_SUDO_IO_LOGDIR
cleanup_pty(gotsignal);
#endif
#ifdef HAVE_SELINUX
selinux_restore_tty();
#endif
}
static void
show_version()
{
(void) printf("Sudo version %s\n", PACKAGE_VERSION);
if (getuid() == 0) {
putchar('\n');
(void) printf("Configure args: %s\n", CONFIGURE_ARGS);
(void) printf("Sudoers path: %s\n", _PATH_SUDOERS);
#ifdef HAVE_LDAP
# ifdef _PATH_NSSWITCH_CONF
(void) printf("nsswitch path: %s\n", _PATH_NSSWITCH_CONF);
# endif
(void) printf("ldap.conf path: %s\n", _PATH_LDAP_CONF);
(void) printf("ldap.secret path: %s\n", _PATH_LDAP_SECRET);
#endif
dump_auth_methods();
dump_defaults();
dump_interfaces();
}
exit(0);
}
#ifdef USE_ADMIN_FLAG
static void
create_admin_success_flag()
{
struct stat statbuf;
char flagfile[PATH_MAX];
int fd, n;
if (!user_in_group(sudo_user.pw, "admin"))
return;
n = snprintf(flagfile, sizeof(flagfile), "%s/.sudo_as_admin_successful",
user_dir);
if (n <= 0 || n >= sizeof(flagfile))
return;
set_perms(PERM_USER);
if (stat(flagfile, &statbuf) == 0) {
set_perms(PERM_ROOT);
return;
}
fd = open(flagfile, O_CREAT|O_WRONLY|O_EXCL, 0644);
close(fd);
set_perms(PERM_ROOT);
}
#else
static void
create_admin_success_flag()
{
}
#endif