/*
* Copyright (c) 2009-2013 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef __TANDEM
# include <floss.h>
#endif
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
# include <memory.h>
# endif
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <grp.h>
#include <pwd.h>
#ifdef TIME_WITH_SYS_TIME
# include <time.h>
#endif
#ifdef HAVE_LOGIN_CAP_H
# include <login_cap.h>
# ifndef LOGIN_SETENV
# define LOGIN_SETENV 0
# endif
#endif
#ifdef HAVE_PROJECT_H
# include <project.h>
# include <sys/task.h>
#endif
#ifdef HAVE_SELINUX
# include <selinux/selinux.h>
#endif
#ifdef HAVE_SETAUTHDB
# include <usersec.h>
#endif /* HAVE_SETAUTHDB */
#if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
# ifdef __hpux
# undef MAXINT
# include <hpsecurity.h>
# else
# include <sys/security.h>
# endif /* __hpux */
# include <prot.h>
#endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
#include <sudo_usage.h>
#include "sudo.h"
#include "sudo_plugin.h"
#include "sudo_plugin_int.h"
/*
* Local variables
*/
struct plugin_container policy_plugin;
struct plugin_container_list io_plugins = TAILQ_HEAD_INITIALIZER(io_plugins);
struct user_details user_details;
const char *list_user; /* extern for parse_args.c */
static struct command_details command_details;
static int sudo_mode;
/*
* Local functions
*/
static void fix_fds(void);
static void disable_coredumps(void);
static void sudo_check_suid(const char *path);
static char **get_user_info(struct user_details *);
static void command_info_to_details(char * const info[],
struct command_details *details);
/* Policy plugin convenience functions. */
static int policy_open(struct plugin_container *plugin, char * const settings[],
char * const user_info[], char * const user_env[]);
static void policy_close(struct plugin_container *plugin, int exit_status,
int error);
static int policy_show_version(struct plugin_container *plugin, int verbose);
static int policy_check(struct plugin_container *plugin, int argc,
char * const argv[], char *env_add[], char **command_info[],
char **argv_out[], char **user_env_out[]);
static int policy_list(struct plugin_container *plugin, int argc,
char * const argv[], int verbose, const char *list_user);
static int policy_validate(struct plugin_container *plugin);
static void policy_invalidate(struct plugin_container *plugin, int remove);
/* I/O log plugin convenience functions. */
static int iolog_open(struct plugin_container *plugin, char * const settings[],
char * const user_info[], char * const command_details[],
int argc, char * const argv[], char * const user_env[]);
static void iolog_close(struct plugin_container *plugin, int exit_status,
int error);
static int iolog_show_version(struct plugin_container *plugin, int verbose);
static void iolog_unlink(struct plugin_container *plugin);
#ifdef RLIMIT_CORE
static struct rlimit corelimit;
#endif
#ifdef __linux__
static struct rlimit nproclimit;
#endif
__dso_public int main(int argc, char *argv[], char *envp[]);
int
main(int argc, char *argv[], char *envp[])
{
int nargc, ok, exitcode = 0;
char **nargv, **settings, **env_add;
char **user_info, **command_info, **argv_out, **user_env_out;
struct plugin_container *plugin, *next;
sigset_t mask;
debug_decl(main, SUDO_DEBUG_MAIN)
os_init(argc, argv, envp);
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE_NAME, LOCALEDIR);
textdomain(PACKAGE_NAME);
#ifdef HAVE_TZSET
(void) tzset();
#endif /* HAVE_TZSET */
/* Must be done before we do any password lookups */
#if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
(void) set_auth_parameters(argc, argv);
# ifdef HAVE_INITPRIVS
initprivs();
# endif
#endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
/* Make sure we are setuid root. */
sudo_check_suid(argv[0]);
/* Reset signal mask, save signal state and make sure fds 0-2 are open. */
(void) sigemptyset(&mask);
(void) sigprocmask(SIG_SETMASK, &mask, NULL);
save_signals();
fix_fds();
/* Read sudo.conf. */
sudo_conf_read(NULL);
/* Fill in user_info with user name, uid, cwd, etc. */
memset(&user_details, 0, sizeof(user_details));
user_info = get_user_info(&user_details);
/* Disable core dumps if not enabled in sudo.conf. */
disable_coredumps();
/* Parse command line arguments. */
sudo_mode = parse_args(argc, argv, &nargc, &nargv, &settings, &env_add);
sudo_debug_printf(SUDO_DEBUG_DEBUG, "sudo_mode %d", sudo_mode);
/* Print sudo version early, in case of plugin init failure. */
if (ISSET(sudo_mode, MODE_VERSION)) {
printf(_("Sudo version %s\n"), PACKAGE_VERSION);
if (user_details.uid == ROOT_UID)
(void) printf(_("Configure options: %s\n"), CONFIGURE_ARGS);
}
/* Load plugins. */
if (!sudo_load_plugins(&policy_plugin, &io_plugins))
fatalx(U_("fatal error, unable to load plugins"));
/* Open policy plugin. */
ok = policy_open(&policy_plugin, settings, user_info, envp);
if (ok != 1) {
if (ok == -2)
usage(1);
else
fatalx(U_("unable to initialize policy plugin"));
}
init_signals();
switch (sudo_mode & MODE_MASK) {
case MODE_VERSION:
policy_show_version(&policy_plugin, !user_details.uid);
TAILQ_FOREACH(plugin, &io_plugins, entries) {
ok = iolog_open(plugin, settings, user_info, NULL,
nargc, nargv, envp);
if (ok != -1)
iolog_show_version(plugin, !user_details.uid);
}
break;
case MODE_VALIDATE:
case MODE_VALIDATE|MODE_INVALIDATE:
ok = policy_validate(&policy_plugin);
exit(ok != 1);
case MODE_KILL:
case MODE_INVALIDATE:
policy_invalidate(&policy_plugin, sudo_mode == MODE_KILL);
exit(0);
break;
case MODE_CHECK:
case MODE_CHECK|MODE_INVALIDATE:
case MODE_LIST:
case MODE_LIST|MODE_INVALIDATE:
ok = policy_list(&policy_plugin, nargc, nargv,
ISSET(sudo_mode, MODE_LONG_LIST), list_user);
exit(ok != 1);
case MODE_EDIT:
case MODE_RUN:
ok = policy_check(&policy_plugin, nargc, nargv, env_add,
&command_info, &argv_out, &user_env_out);
sudo_debug_printf(SUDO_DEBUG_INFO, "policy plugin returns %d", ok);
if (ok != 1) {
if (ok == -2)
usage(1);
exit(1); /* plugin printed error message */
}
/* Open I/O plugins once policy plugin succeeds. */
TAILQ_FOREACH_SAFE(plugin, &io_plugins, entries, next) {
ok = iolog_open(plugin, settings, user_info,
command_info, nargc, nargv, envp);
switch (ok) {
case 1:
break;
case 0:
/* I/O plugin asked to be disabled, remove and free. */
iolog_unlink(plugin);
break;
case -2:
usage(1);
break;
default:
fatalx(U_("error initializing I/O plugin %s"),
plugin->name);
}
}
/* Setup command details and run command/edit. */
command_info_to_details(command_info, &command_details);
command_details.argv = argv_out;
command_details.envp = user_env_out;
if (ISSET(sudo_mode, MODE_BACKGROUND))
SET(command_details.flags, CD_BACKGROUND);
/* Become full root (not just setuid) so user cannot kill us. */
if (setuid(ROOT_UID) == -1)
warning("setuid(%d)", ROOT_UID);
/* Restore coredumpsize resource limit before running. */
#ifdef RLIMIT_CORE
if (sudo_conf_disable_coredump())
(void) setrlimit(RLIMIT_CORE, &corelimit);
#endif /* RLIMIT_CORE */
if (ISSET(command_details.flags, CD_SUDOEDIT)) {
exitcode = sudo_edit(&command_details);
} else {
exitcode = run_command(&command_details);
}
/* The close method was called by sudo_edit/run_command. */
break;
default:
fatalx(U_("unexpected sudo mode 0x%x"), sudo_mode);
}
sudo_debug_exit_int(__func__, __FILE__, __LINE__, sudo_debug_subsys, exitcode);
exit(exitcode);
}
int
os_init_common(int argc, char *argv[], char *envp[])
{
initprogname(argc > 0 ? argv[0] : "sudo");
#ifdef STATIC_SUDOERS_PLUGIN
preload_static_symbols();
#endif
return 0;
}
/*
* Ensure that stdin, stdout and stderr are open; set to /dev/null if not.
* Some operating systems do this automatically in the kernel or libc.
*/
static void
fix_fds(void)
{
int miss[3], devnull = -1;
debug_decl(fix_fds, SUDO_DEBUG_UTIL)
/*
* stdin, stdout and stderr must be open; set them to /dev/null
* if they are closed.
*/
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)
fatal(U_("unable to open %s"), _PATH_DEVNULL);
if (miss[STDIN_FILENO] && dup2(devnull, STDIN_FILENO) == -1)
fatal("dup2");
if (miss[STDOUT_FILENO] && dup2(devnull, STDOUT_FILENO) == -1)
fatal("dup2");
if (miss[STDERR_FILENO] && dup2(devnull, STDERR_FILENO) == -1)
fatal("dup2");
if (devnull > STDERR_FILENO)
close(devnull);
}
debug_return;
}
/*
* Allocate space for groups and fill in using getgrouplist()
* for when we cannot (or don't want to) use getgroups().
*/
static int
fill_group_list(struct user_details *ud, int system_maxgroups)
{
int tries, rval = -1;
debug_decl(fill_group_list, SUDO_DEBUG_UTIL)
/*
* If user specified a max number of groups, use it, otherwise keep
* trying getgrouplist() until we have enough room in the array.
*/
ud->ngroups = sudo_conf_max_groups();
if (ud->ngroups > 0) {
ud->groups = emalloc2(ud->ngroups, sizeof(GETGROUPS_T));
/* No error on insufficient space if user specified max_groups. */
(void)getgrouplist(ud->username, ud->gid, ud->groups, &ud->ngroups);
rval = 0;
} else {
/*
* It is possible to belong to more groups in the group database
* than NGROUPS_MAX. We start off with NGROUPS_MAX * 4 entries
* and double this as needed.
*/
ud->groups = NULL;
ud->ngroups = system_maxgroups << 1;
for (tries = 0; tries < 10 && rval == -1; tries++) {
ud->ngroups <<= 1;
efree(ud->groups);
ud->groups = emalloc2(ud->ngroups, sizeof(GETGROUPS_T));
rval = getgrouplist(ud->username, ud->gid, ud->groups, &ud->ngroups);
}
}
debug_return_int(rval);
}
static char *
get_user_groups(struct user_details *ud)
{
char *cp, *gid_list = NULL;
size_t glsize;
int i, len, maxgroups, group_source;
debug_decl(get_user_groups, SUDO_DEBUG_UTIL)
#if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
maxgroups = (int)sysconf(_SC_NGROUPS_MAX);
if (maxgroups < 0)
#endif
maxgroups = NGROUPS_MAX;
ud->groups = NULL;
group_source = sudo_conf_group_source();
if (group_source != GROUP_SOURCE_DYNAMIC) {
if ((ud->ngroups = getgroups(0, NULL)) > 0) {
/* Use groups from kernel if not too many or source is static. */
if (ud->ngroups < maxgroups || group_source == GROUP_SOURCE_STATIC) {
ud->groups = emalloc2(ud->ngroups, sizeof(GETGROUPS_T));
if (getgroups(ud->ngroups, ud->groups) < 0) {
efree(ud->groups);
ud->groups = NULL;
}
}
}
}
if (ud->groups == NULL) {
/*
* Query group database if kernel list is too small or disabled.
* Typically, this is because NFS can only support up to 16 groups.
*/
if (fill_group_list(ud, maxgroups) == -1)
fatal(U_("unable to get group vector"));
}
/*
* Format group list as a comma-separated string of gids.
*/
glsize = sizeof("groups=") - 1 + (ud->ngroups * (MAX_UID_T_LEN + 1));
gid_list = emalloc(glsize);
memcpy(gid_list, "groups=", sizeof("groups=") - 1);
cp = gid_list + sizeof("groups=") - 1;
for (i = 0; i < ud->ngroups; i++) {
/* XXX - check rval */
len = snprintf(cp, glsize - (cp - gid_list), "%s%u",
i ? "," : "", (unsigned int)ud->groups[i]);
cp += len;
}
debug_return_str(gid_list);
}
/*
* Return user information as an array of name=value pairs.
* and fill in struct user_details (which shares the same strings).
*/
static char **
get_user_info(struct user_details *ud)
{
char *cp, **user_info, cwd[PATH_MAX], host[HOST_NAME_MAX + 1];
struct passwd *pw;
int fd, i = 0;
debug_decl(get_user_info, SUDO_DEBUG_UTIL)
/* XXX - bound check number of entries */
user_info = emalloc2(32, sizeof(char *));
ud->pid = getpid();
ud->ppid = getppid();
ud->pgid = getpgid(0);
ud->tcpgid = (pid_t)-1;
fd = open(_PATH_TTY, O_RDWR|O_NOCTTY|O_NONBLOCK, 0);
if (fd != -1) {
ud->tcpgid = tcgetpgrp(fd);
close(fd);
}
ud->sid = getsid(0);
ud->uid = getuid();
ud->euid = geteuid();
ud->gid = getgid();
ud->egid = getegid();
pw = getpwuid(ud->uid);
if (pw == NULL)
fatalx(U_("unknown uid %u: who are you?"), (unsigned int)ud->uid);
user_info[i] = fmt_string("user", pw->pw_name);
if (user_info[i] == NULL)
fatal(NULL);
ud->username = user_info[i] + sizeof("user=") - 1;
/* Stash user's shell for use with the -s flag; don't pass to plugin. */
if ((ud->shell = getenv("SHELL")) == NULL || ud->shell[0] == '\0') {
ud->shell = pw->pw_shell[0] ? pw->pw_shell : _PATH_BSHELL;
}
ud->shell = estrdup(ud->shell);
easprintf(&user_info[++i], "pid=%d", (int)ud->pid);
easprintf(&user_info[++i], "ppid=%d", (int)ud->ppid);
easprintf(&user_info[++i], "pgid=%d", (int)ud->pgid);
easprintf(&user_info[++i], "tcpgid=%d", (int)ud->tcpgid);
easprintf(&user_info[++i], "sid=%d", (int)ud->sid);
easprintf(&user_info[++i], "uid=%u", (unsigned int)ud->uid);
easprintf(&user_info[++i], "euid=%u", (unsigned int)ud->euid);
easprintf(&user_info[++i], "gid=%u", (unsigned int)ud->gid);
easprintf(&user_info[++i], "egid=%u", (unsigned int)ud->egid);
if ((cp = get_user_groups(ud)) != NULL)
user_info[++i] = cp;
if (getcwd(cwd, sizeof(cwd)) != NULL) {
user_info[++i] = fmt_string("cwd", cwd);
if (user_info[i] == NULL)
fatal(NULL);
ud->cwd = user_info[i] + sizeof("cwd=") - 1;
}
if ((cp = get_process_ttyname()) != NULL) {
user_info[++i] = fmt_string("tty", cp);
if (user_info[i] == NULL)
fatal(NULL);
ud->tty = user_info[i] + sizeof("tty=") - 1;
efree(cp);
}
if (gethostname(host, sizeof(host)) == 0)
host[sizeof(host) - 1] = '\0';
else
strlcpy(host, "localhost", sizeof(host));
user_info[++i] = fmt_string("host", host);
if (user_info[i] == NULL)
fatal(NULL);
ud->host = user_info[i] + sizeof("host=") - 1;
get_ttysize(&ud->ts_lines, &ud->ts_cols);
easprintf(&user_info[++i], "lines=%d", ud->ts_lines);
easprintf(&user_info[++i], "cols=%d", ud->ts_cols);
user_info[++i] = NULL;
debug_return_ptr(user_info);
}
/*
* Convert a command_info array into a command_details structure.
*/
static void
command_info_to_details(char * const info[], struct command_details *details)
{
int i;
id_t id;
char *cp;
const char *errstr;
debug_decl(command_info_to_details, SUDO_DEBUG_PCOMM)
memset(details, 0, sizeof(*details));
details->closefrom = -1;
TAILQ_INIT(&details->preserved_fds);
#define SET_STRING(s, n) \
if (strncmp(s, info[i], sizeof(s) - 1) == 0 && info[i][sizeof(s) - 1]) { \
details->n = info[i] + sizeof(s) - 1; \
break; \
}
sudo_debug_printf(SUDO_DEBUG_INFO, "command info from plugin:");
for (i = 0; info[i] != NULL; i++) {
sudo_debug_printf(SUDO_DEBUG_INFO, " %d: %s", i, info[i]);
switch (info[i][0]) {
case 'c':
SET_STRING("chroot=", chroot)
SET_STRING("command=", command)
SET_STRING("cwd=", cwd)
if (strncmp("closefrom=", info[i], sizeof("closefrom=") - 1) == 0) {
cp = info[i] + sizeof("closefrom=") - 1;
details->closefrom = strtonum(cp, 0, INT_MAX, &errstr);
if (errstr != NULL)
fatalx(U_("%s: %s"), info[i], U_(errstr));
break;
}
break;
case 'e':
if (strncmp("exec_background=", info[i], sizeof("exec_background=") - 1) == 0) {
if (atobool(info[i] + sizeof("exec_background=") - 1) == true)
SET(details->flags, CD_EXEC_BG);
break;
}
break;
case 'l':
SET_STRING("login_class=", login_class)
break;
case 'n':
if (strncmp("nice=", info[i], sizeof("nice=") - 1) == 0) {
cp = info[i] + sizeof("nice=") - 1;
details->priority = strtonum(cp, INT_MIN, INT_MAX, &errstr);
if (errstr != NULL)
fatalx(U_("%s: %s"), info[i], U_(errstr));
SET(details->flags, CD_SET_PRIORITY);
break;
}
if (strncmp("noexec=", info[i], sizeof("noexec=") - 1) == 0) {
if (atobool(info[i] + sizeof("noexec=") - 1) == true)
SET(details->flags, CD_NOEXEC);
break;
}
break;
case 'p':
if (strncmp("preserve_groups=", info[i], sizeof("preserve_groups=") - 1) == 0) {
if (atobool(info[i] + sizeof("preserve_groups=") - 1) == true)
SET(details->flags, CD_PRESERVE_GROUPS);
break;
}
if (strncmp("preserve_fds=", info[i], sizeof("preserve_fds=") - 1) == 0) {
parse_preserved_fds(&details->preserved_fds,
info[i] + sizeof("preserve_fds=") - 1);
break;
}
break;
case 'r':
if (strncmp("runas_egid=", info[i], sizeof("runas_egid=") - 1) == 0) {
cp = info[i] + sizeof("runas_egid=") - 1;
id = atoid(cp, NULL, NULL, &errstr);
if (errstr != NULL)
fatalx(U_("%s: %s"), info[i], U_(errstr));
details->egid = (gid_t)id;
SET(details->flags, CD_SET_EGID);
break;
}
if (strncmp("runas_euid=", info[i], sizeof("runas_euid=") - 1) == 0) {
cp = info[i] + sizeof("runas_euid=") - 1;
id = atoid(cp, NULL, NULL, &errstr);
if (errstr != NULL)
fatalx(U_("%s: %s"), info[i], U_(errstr));
details->euid = (uid_t)id;
SET(details->flags, CD_SET_EUID);
break;
}
if (strncmp("runas_gid=", info[i], sizeof("runas_gid=") - 1) == 0) {
cp = info[i] + sizeof("runas_gid=") - 1;
id = atoid(cp, NULL, NULL, &errstr);
if (errstr != NULL)
fatalx(U_("%s: %s"), info[i], U_(errstr));
details->gid = (gid_t)id;
SET(details->flags, CD_SET_GID);
break;
}
if (strncmp("runas_groups=", info[i], sizeof("runas_groups=") - 1) == 0) {
/* parse_gid_list() will call fatalx() on error. */
cp = info[i] + sizeof("runas_groups=") - 1;
details->ngroups = parse_gid_list(cp, NULL, &details->groups);
break;
}
if (strncmp("runas_uid=", info[i], sizeof("runas_uid=") - 1) == 0) {
cp = info[i] + sizeof("runas_uid=") - 1;
id = atoid(cp, NULL, NULL, &errstr);
if (errstr != NULL)
fatalx(U_("%s: %s"), info[i], U_(errstr));
details->uid = (uid_t)id;
SET(details->flags, CD_SET_UID);
break;
}
#ifdef HAVE_PRIV_SET
if (strncmp("runas_privs=", info[i], sizeof("runas_privs=") - 1) == 0) {
const char *endp;
cp = info[i] + sizeof("runas_privs=") - 1;
if (*cp != '\0') {
details->privs = priv_str_to_set(cp, ",", &endp);
if (details->privs == NULL)
warning("invalid runas_privs %s", endp);
}
break;
}
if (strncmp("runas_limitprivs=", info[i], sizeof("runas_limitprivs=") - 1) == 0) {
const char *endp;
cp = info[i] + sizeof("runas_limitprivs=") - 1;
if (*cp != '\0') {
details->limitprivs = priv_str_to_set(cp, ",", &endp);
if (details->limitprivs == NULL)
warning("invalid runas_limitprivs %s", endp);
}
break;
}
#endif /* HAVE_PRIV_SET */
break;
case 's':
SET_STRING("selinux_role=", selinux_role)
SET_STRING("selinux_type=", selinux_type)
if (strncmp("set_utmp=", info[i], sizeof("set_utmp=") - 1) == 0) {
if (atobool(info[i] + sizeof("set_utmp=") - 1) == true)
SET(details->flags, CD_SET_UTMP);
break;
}
if (strncmp("sudoedit=", info[i], sizeof("sudoedit=") - 1) == 0) {
if (atobool(info[i] + sizeof("sudoedit=") - 1) == true)
SET(details->flags, CD_SUDOEDIT);
break;
}
break;
case 't':
if (strncmp("timeout=", info[i], sizeof("timeout=") - 1) == 0) {
cp = info[i] + sizeof("timeout=") - 1;
details->timeout = strtonum(cp, 0, INT_MAX, &errstr);
if (errstr != NULL)
fatalx(U_("%s: %s"), info[i], U_(errstr));
SET(details->flags, CD_SET_TIMEOUT);
break;
}
break;
case 'u':
if (strncmp("umask=", info[i], sizeof("umask=") - 1) == 0) {
cp = info[i] + sizeof("umask=") - 1;
details->umask = atomode(cp, &errstr);
if (errstr != NULL)
fatalx(U_("%s: %s"), info[i], U_(errstr));
SET(details->flags, CD_SET_UMASK);
break;
}
if (strncmp("use_pty=", info[i], sizeof("use_pty=") - 1) == 0) {
if (atobool(info[i] + sizeof("use_pty=") - 1) == true)
SET(details->flags, CD_USE_PTY);
break;
}
SET_STRING("utmp_user=", utmp_user)
break;
}
}
if (!ISSET(details->flags, CD_SET_EUID))
details->euid = details->uid;
#ifdef HAVE_SETAUTHDB
aix_setauthdb(IDtouser(details->euid));
#endif
details->pw = getpwuid(details->euid);
if (details->pw != NULL && (details->pw = pw_dup(details->pw)) == NULL)
fatal(NULL);
#ifdef HAVE_SETAUTHDB
aix_restoreauthdb();
#endif
#ifdef HAVE_SELINUX
if (details->selinux_role != NULL && is_selinux_enabled() > 0)
SET(details->flags, CD_RBAC_ENABLED);
#endif
debug_return;
}
static void
sudo_check_suid(const char *sudo)
{
char pathbuf[PATH_MAX];
struct stat sb;
bool qualified;
debug_decl(sudo_check_suid, SUDO_DEBUG_PCOMM)
if (geteuid() != 0) {
/* Search for sudo binary in PATH if not fully qualified. */
qualified = strchr(sudo, '/') != NULL;
if (!qualified) {
char *path = getenv_unhooked("PATH");
if (path != NULL) {
int len;
char *cp, *colon;
cp = path = estrdup(path);
do {
if ((colon = strchr(cp, ':')))
*colon = '\0';
len = snprintf(pathbuf, sizeof(pathbuf), "%s/%s", cp, sudo);
if (len <= 0 || (size_t)len >= sizeof(pathbuf))
continue;
if (access(pathbuf, X_OK) == 0) {
sudo = pathbuf;
qualified = true;
break;
}
cp = colon + 1;
} while (colon);
efree(path);
}
}
if (qualified && stat(sudo, &sb) == 0) {
/* Try to determine why sudo was not running as root. */
if (sb.st_uid != ROOT_UID || !ISSET(sb.st_mode, S_ISUID)) {
fatalx(
U_("%s must be owned by uid %d and have the setuid bit set"),
sudo, ROOT_UID);
} else {
fatalx(U_("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, sudo);
}
} else {
fatalx(
U_("effective uid is not %d, is sudo installed setuid root?"),
ROOT_UID);
}
}
debug_return;
}
/*
* Disable core dumps to avoid dropping a core with user password in it.
* We will reset this limit before executing the command.
* Not all operating systems disable core dumps for setuid processes.
*/
static void
disable_coredumps(void)
{
#if defined(RLIMIT_CORE)
struct rlimit rl;
debug_decl(disable_coredumps, SUDO_DEBUG_UTIL)
/*
* Turn off core dumps?
*/
if (sudo_conf_disable_coredump()) {
(void) getrlimit(RLIMIT_CORE, &corelimit);
memcpy(&rl, &corelimit, sizeof(struct rlimit));
rl.rlim_cur = 0;
(void) setrlimit(RLIMIT_CORE, &rl);
}
debug_return;
#endif /* RLIMIT_CORE */
}
/*
* Unlimit the number of processes since Linux's setuid() will
* apply resource limits when changing uid and return EAGAIN if
* nproc would be exceeded by the uid switch.
*/
static void
unlimit_nproc(void)
{
#ifdef __linux__
struct rlimit rl;
debug_decl(unlimit_nproc, SUDO_DEBUG_UTIL)
(void) getrlimit(RLIMIT_NPROC, &nproclimit);
rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
if (setrlimit(RLIMIT_NPROC, &rl) != 0) {
memcpy(&rl, &nproclimit, sizeof(struct rlimit));
rl.rlim_cur = rl.rlim_max;
(void)setrlimit(RLIMIT_NPROC, &rl);
}
debug_return;
#endif /* __linux__ */
}
/*
* Restore saved value of RLIMIT_NPROC.
*/
static void
restore_nproc(void)
{
#ifdef __linux__
debug_decl(restore_nproc, SUDO_DEBUG_UTIL)
(void) setrlimit(RLIMIT_NPROC, &nproclimit);
debug_return;
#endif /* __linux__ */
}
/*
* Setup the execution environment immediately prior to the call to execve()
* Returns true on success and false on failure.
*/
bool
exec_setup(struct command_details *details, const char *ptyname, int ptyfd)
{
bool rval = false;
debug_decl(exec_setup, SUDO_DEBUG_EXEC)
#ifdef HAVE_SELINUX
if (ISSET(details->flags, CD_RBAC_ENABLED)) {
if (selinux_setup(details->selinux_role, details->selinux_type,
ptyname ? ptyname : user_details.tty, ptyfd) == -1)
goto done;
}
#endif
if (details->pw != NULL) {
#ifdef HAVE_PROJECT_H
set_project(details->pw);
#endif
#ifdef HAVE_PRIV_SET
if (details->privs != NULL) {
if (setppriv(PRIV_SET, PRIV_INHERITABLE, details->privs) != 0) {
warning("unable to set privileges");
goto done;
}
}
if (details->limitprivs != NULL) {
if (setppriv(PRIV_SET, PRIV_LIMIT, details->limitprivs) != 0) {
warning("unable to set limit privileges");
goto done;
}
} else if (details->privs != NULL) {
if (setppriv(PRIV_SET, PRIV_LIMIT, details->privs) != 0) {
warning("unable to set limit privileges");
goto done;
}
}
#endif /* HAVE_PRIV_SET */
#ifdef HAVE_GETUSERATTR
aix_prep_user(details->pw->pw_name, ptyname ? ptyname : user_details.tty);
#endif
#ifdef HAVE_LOGIN_CAP_H
if (details->login_class) {
int flags;
login_cap_t *lc;
/*
* We only use setusercontext() to set the nice value and rlimits
* unless this is a login shell (sudo -i).
*/
lc = login_getclass((char *)details->login_class);
if (!lc) {
warningx(U_("unknown login class %s"), details->login_class);
errno = ENOENT;
goto done;
}
if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
/* Set everything except user, group and login name. */
flags = LOGIN_SETALL;
CLR(flags, LOGIN_SETGROUP|LOGIN_SETLOGIN|LOGIN_SETUSER|LOGIN_SETENV|LOGIN_SETPATH);
CLR(details->flags, CD_SET_UMASK); /* LOGIN_UMASK instead */
} else {
flags = LOGIN_SETRESOURCES|LOGIN_SETPRIORITY;
}
if (setusercontext(lc, details->pw, details->pw->pw_uid, flags)) {
warning(U_("unable to set user context"));
if (details->pw->pw_uid != ROOT_UID)
goto done;
}
}
#endif /* HAVE_LOGIN_CAP_H */
}
/*
* Set groups, including supplementary group vector.
*/
if (!ISSET(details->flags, CD_PRESERVE_GROUPS)) {
if (details->ngroups >= 0) {
if (sudo_setgroups(details->ngroups, details->groups) < 0) {
warning(U_("unable to set supplementary group IDs"));
goto done;
}
}
}
#ifdef HAVE_SETEUID
if (ISSET(details->flags, CD_SET_EGID) && setegid(details->egid)) {
warning(U_("unable to set effective gid to runas gid %u"),
(unsigned int)details->egid);
goto done;
}
#endif
if (ISSET(details->flags, CD_SET_GID) && setgid(details->gid)) {
warning(U_("unable to set gid to runas gid %u"),
(unsigned int)details->gid);
goto done;
}
if (ISSET(details->flags, CD_SET_PRIORITY)) {
if (setpriority(PRIO_PROCESS, 0, details->priority) != 0) {
warning(U_("unable to set process priority"));
goto done;
}
}
if (ISSET(details->flags, CD_SET_UMASK))
(void) umask(details->umask);
if (details->chroot) {
if (chroot(details->chroot) != 0 || chdir("/") != 0) {
warning(U_("unable to change root to %s"), details->chroot);
goto done;
}
}
/*
* Unlimit the number of processes since Linux's setuid() will
* return EAGAIN if RLIMIT_NPROC would be exceeded by the uid switch.
*/
unlimit_nproc();
#ifdef HAVE_SETRESUID
if (setresuid(details->uid, details->euid, details->euid) != 0) {
warning(U_("unable to change to runas uid (%u, %u)"), details->uid,
details->euid);
goto done;
}
#elif defined(HAVE_SETREUID)
if (setreuid(details->uid, details->euid) != 0) {
warning(U_("unable to change to runas uid (%u, %u)"),
(unsigned int)details->uid, (unsigned int)details->euid);
goto done;
}
#else
if (seteuid(details->euid) != 0 || setuid(details->euid) != 0) {
warning(U_("unable to change to runas uid (%u, %u)"), details->uid,
details->euid);
goto done;
}
#endif /* !HAVE_SETRESUID && !HAVE_SETREUID */
/* Restore previous value of RLIMIT_NPROC. */
restore_nproc();
/*
* Only change cwd if we have chroot()ed or the policy modules
* specifies a different cwd. Must be done after uid change.
*/
if (details->cwd) {
if (details->chroot || strcmp(details->cwd, user_details.cwd) != 0) {
/* Note: cwd is relative to the new root, if any. */
if (chdir(details->cwd) != 0) {
warning(U_("unable to change directory to %s"), details->cwd);
goto done;
}
}
}
rval = true;
done:
debug_return_bool(rval);
}
/*
* Run the command and wait for it to complete.
*/
int
run_command(struct command_details *details)
{
struct plugin_container *plugin;
struct command_status cstat;
int exitcode = 1;
debug_decl(run_command, SUDO_DEBUG_EXEC)
cstat.type = CMD_INVALID;
cstat.val = 0;
sudo_execute(details, &cstat);
switch (cstat.type) {
case CMD_ERRNO:
/* exec_setup() or execve() returned an error. */
sudo_debug_printf(SUDO_DEBUG_DEBUG,
"calling policy close with errno %d", cstat.val);
policy_close(&policy_plugin, 0, cstat.val);
TAILQ_FOREACH(plugin, &io_plugins, entries) {
sudo_debug_printf(SUDO_DEBUG_DEBUG,
"calling I/O close with errno %d", cstat.val);
iolog_close(plugin, 0, cstat.val);
}
exitcode = 1;
break;
case CMD_WSTATUS:
/* Command ran, exited or was killed. */
sudo_debug_printf(SUDO_DEBUG_DEBUG,
"calling policy close with wait status %d", cstat.val);
policy_close(&policy_plugin, cstat.val, 0);
TAILQ_FOREACH(plugin, &io_plugins, entries) {
sudo_debug_printf(SUDO_DEBUG_DEBUG,
"calling I/O close with wait status %d", cstat.val);
iolog_close(plugin, cstat.val, 0);
}
if (WIFEXITED(cstat.val))
exitcode = WEXITSTATUS(cstat.val);
else if (WIFSIGNALED(cstat.val))
exitcode = WTERMSIG(cstat.val) | 128;
break;
default:
warningx(U_("unexpected child termination condition: %d"), cstat.type);
break;
}
debug_return_int(exitcode);
}
static int
policy_open(struct plugin_container *plugin, char * const settings[],
char * const user_info[], char * const user_env[])
{
int rval;
debug_decl(policy_open, SUDO_DEBUG_PCOMM)
/*
* Backwards compatibility for older API versions
*/
switch (plugin->u.generic->version) {
case SUDO_API_MKVERSION(1, 0):
case SUDO_API_MKVERSION(1, 1):
rval = plugin->u.policy_1_0->open(plugin->u.io_1_0->version,
sudo_conversation, _sudo_printf, settings, user_info, user_env);
break;
default:
rval = plugin->u.policy->open(SUDO_API_VERSION, sudo_conversation,
_sudo_printf, settings, user_info, user_env, plugin->options);
}
debug_return_bool(rval);
}
static void
policy_close(struct plugin_container *plugin, int exit_status, int error)
{
debug_decl(policy_close, SUDO_DEBUG_PCOMM)
if (plugin->u.policy->close != NULL)
plugin->u.policy->close(exit_status, error);
else
warning(U_("unable to execute %s"), command_details.command);
debug_return;
}
static int
policy_show_version(struct plugin_container *plugin, int verbose)
{
debug_decl(policy_show_version, SUDO_DEBUG_PCOMM)
if (plugin->u.policy->show_version == NULL)
debug_return_bool(true);
debug_return_bool(plugin->u.policy->show_version(verbose));
}
static int
policy_check(struct plugin_container *plugin, int argc, char * const argv[],
char *env_add[], char **command_info[], char **argv_out[],
char **user_env_out[])
{
debug_decl(policy_check, SUDO_DEBUG_PCOMM)
if (plugin->u.policy->check_policy == NULL) {
fatalx(U_("policy plugin %s is missing the `check_policy' method"),
plugin->name);
}
debug_return_bool(plugin->u.policy->check_policy(argc, argv, env_add,
command_info, argv_out, user_env_out));
}
static int
policy_list(struct plugin_container *plugin, int argc, char * const argv[],
int verbose, const char *list_user)
{
debug_decl(policy_list, SUDO_DEBUG_PCOMM)
if (plugin->u.policy->list == NULL) {
warningx(U_("policy plugin %s does not support listing privileges"),
plugin->name);
debug_return_bool(false);
}
debug_return_bool(plugin->u.policy->list(argc, argv, verbose, list_user));
}
static int
policy_validate(struct plugin_container *plugin)
{
debug_decl(policy_validate, SUDO_DEBUG_PCOMM)
if (plugin->u.policy->validate == NULL) {
warningx(U_("policy plugin %s does not support the -v option"),
plugin->name);
debug_return_bool(false);
}
debug_return_bool(plugin->u.policy->validate());
}
static void
policy_invalidate(struct plugin_container *plugin, int remove)
{
debug_decl(policy_invalidate, SUDO_DEBUG_PCOMM)
if (plugin->u.policy->invalidate == NULL) {
fatalx(U_("policy plugin %s does not support the -k/-K options"),
plugin->name);
}
plugin->u.policy->invalidate(remove);
debug_return;
}
int
policy_init_session(struct command_details *details)
{
int rval = true;
debug_decl(policy_init_session, SUDO_DEBUG_PCOMM)
if (policy_plugin.u.policy->init_session) {
/*
* Backwards compatibility for older API versions
*/
switch (policy_plugin.u.generic->version) {
case SUDO_API_MKVERSION(1, 0):
case SUDO_API_MKVERSION(1, 1):
rval = policy_plugin.u.policy_1_0->init_session(details->pw);
break;
default:
rval = policy_plugin.u.policy->init_session(details->pw,
&details->envp);
}
}
debug_return_bool(rval);
}
static int
iolog_open(struct plugin_container *plugin, char * const settings[],
char * const user_info[], char * const command_info[],
int argc, char * const argv[], char * const user_env[])
{
int rval;
debug_decl(iolog_open, SUDO_DEBUG_PCOMM)
/*
* Backwards compatibility for older API versions
*/
switch (plugin->u.generic->version) {
case SUDO_API_MKVERSION(1, 0):
rval = plugin->u.io_1_0->open(plugin->u.io_1_0->version,
sudo_conversation, _sudo_printf, settings, user_info, argc, argv,
user_env);
break;
case SUDO_API_MKVERSION(1, 1):
rval = plugin->u.io_1_1->open(plugin->u.io_1_1->version,
sudo_conversation, _sudo_printf, settings, user_info,
command_info, argc, argv, user_env);
break;
default:
rval = plugin->u.io->open(SUDO_API_VERSION, sudo_conversation,
_sudo_printf, settings, user_info, command_info,
argc, argv, user_env, plugin->options);
}
debug_return_bool(rval);
}
static void
iolog_close(struct plugin_container *plugin, int exit_status, int error)
{
debug_decl(iolog_close, SUDO_DEBUG_PCOMM)
if (plugin->u.io->close != NULL)
plugin->u.io->close(exit_status, error);
debug_return;
}
static int
iolog_show_version(struct plugin_container *plugin, int verbose)
{
debug_decl(iolog_show_version, SUDO_DEBUG_PCOMM)
if (plugin->u.io->show_version == NULL)
debug_return_bool(true);
debug_return_bool(plugin->u.io->show_version(verbose));
}
/*
* Remove the specified I/O logging plugin from the io_plugins list.
* Deregisters any hooks before unlinking, then frees the container.
*/
static void
iolog_unlink(struct plugin_container *plugin)
{
debug_decl(iolog_unlink, SUDO_DEBUG_PCOMM)
/* Deregister hooks, if any. */
if (plugin->u.io->version >= SUDO_API_MKVERSION(1, 2)) {
if (plugin->u.io->deregister_hooks != NULL)
plugin->u.io->deregister_hooks(SUDO_HOOK_VERSION,
deregister_hook);
}
/* Remove from io_plugins list and free. */
TAILQ_REMOVE(&io_plugins, plugin, entries);
efree(plugin);
debug_return;
}
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to sudo.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / sudo / src