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248bae4e564d9fffc22cb422b55b87b4fd21cf95
sudo/plugins/sudoers/sudoers.c
Todd C. Miller 248bae4e56 Add support for -k flag with a command.
2010-03-15 19:41:15 -04:00

1344 lines
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/*
* Copyright (c) 1993-1996, 1998-2010 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.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*
* For a brief history of sudo, please see the HISTORY file included
* with this distribution.
*/
#define _SUDO_MAIN
#ifdef __TANDEM
# include <floss.h>
#endif
#include <config.h>
#include <sys/types.h>
#include <sys/stat.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 /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
# include <memory.h>
# endif
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif /* HAVE_STRING_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <pwd.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 /* __hpux */
# include <prot.h>
#endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
#ifdef HAVE_LOGIN_CAP_H
# include <login_cap.h>
# ifndef LOGIN_DEFROOTCLASS
# define LOGIN_DEFROOTCLASS "daemon"
# endif
#endif
#ifdef HAVE_PROJECT_H
# include <project.h>
# include <sys/task.h>
#endif
#ifdef HAVE_SELINUX
# include <selinux/selinux.h>
#endif
#ifdef HAVE_MBR_CHECK_MEMBERSHIP
# include <membership.h>
#endif
#include <setjmp.h>
#include "sudo_plugin.h"
#include "sudoers.h"
#include "lbuf.h"
#include "interfaces.h"
#include "auth/sudo_auth.h"
#ifdef USING_NONUNIX_GROUPS
# include "nonunix.h"
#endif
/*
* Prototypes
*/
static void init_vars __P((char * const *));
static int set_cmnd __P((int));
static void set_loginclass __P((struct passwd *));
static void set_project __P((struct passwd *));
static void set_runasgr __P((char *));
static void set_runaspw __P((char *));
static int sudoers_policy_version(int verbose);
static struct passwd *get_authpw __P((void));
static int deserialize_info(char * const settings[], char * const user_info[]);
extern int sudo_edit __P((int, char **, char **));
extern int rebuild_env __P((int, int));
extern int env_init __P((char * const envp[]));
void validate_env_vars __P((struct list_member *));
void insert_env_vars __P((struct list_member *));
/* XXX */
char *fmt_string(const char *, const char *);
/*
* Globals
*/
char *prev_user;
struct sudo_user sudo_user;
struct passwd *auth_pw, *list_pw;
struct interface *interfaces;
int num_interfaces;
int long_list;
int debug_level;
uid_t timestamp_uid;
extern int errorlineno;
extern int parse_error;
extern char *errorfile;
#ifdef HAVE_LOGIN_CAP_H
login_cap_t *lc;
#endif /* HAVE_LOGIN_CAP_H */
#ifdef HAVE_BSD_AUTH_H
char *login_style;
#endif /* HAVE_BSD_AUTH_H */
sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
static char *runas_user;
static char *runas_group;
static struct sudo_nss_list *snl;
static int NewArgc;
static char **NewArgv;
/* XXX */
extern int Argc;
extern char **Argv;
extern char **environ;
/* error.c */
extern sigjmp_buf error_jmp;
static int sudo_mode;
static char * const * user_env;
static int
sudoers_policy_open(unsigned int version, sudo_conv_t conversation,
char * const settings[], char * const user_info[],
char * const envp[])
{
int sources = 0;
sigaction_t sa;
struct sudo_nss *nss;
/* 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 */
sudo_conv = conversation; /* XXX, stash elsewhere? */
if (sigsetjmp(error_jmp, 1)) {
/* called via error(), errorx() or log_error() */
return -1;
}
/* XXX - signal setup duplicated in sudo.c */
/*
* Signal setup:
* Ignore keyboard-generated signals so the user cannot interrupt
* us at some point and avoid the logging.
* Install handler to wait for children when they exit.
*/
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);
sudo_setpwent();
sudo_setgrent();
/* Setup defaults data structures. */
init_defaults();
/* Load the list of local ip addresses and netmasks. */
load_interfaces();
/* Parse settings and user_info */
sudo_mode = deserialize_info(settings, user_info);
#if 0 /* XXX */
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) {
case MODE_VERSION:
show_version();
break;
case MODE_HELP:
usage(0);
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();
exit(0);
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;
}
}
/* Must have a command to run... */
if (user_cmnd == NULL && NewArgc == 0)
usage(1);
#endif
init_vars(envp); /* XXX - move this later? */
#ifdef USING_NONUNIX_GROUPS
sudo_nonunix_groupcheck_init(); /* initialise nonunix groups impl */
#endif /* USING_NONUNIX_GROUPS */
/* Parse nsswitch.conf for sudoers order. */
snl = sudo_read_nss();
/* Open and parse sudoers, set global defaults */
tq_foreach_fwd(snl, nss) {
if (nss->open(nss) == 0 && nss->parse(nss) == 0) {
sources++;
nss->setdefs(nss);
}
}
if (sources == 0) {
warningx("no valid sudoers sources found, quitting");
return -1;
}
/* XXX - collect post-sudoers parse settings into a function */
/*
* Set runas passwd/group entries based on command line or sudoers.
* Note that if runas_group was specified without runas_user we
* defer setting runas_pw so the match routines know to ignore it.
*/
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|NO_EXIT, "problem with defaults entries");
/* Set login class if applicable. */
set_loginclass(sudo_user.pw);
#if 0 /* XXX - later */
/* Update initial shell now that runas is set. */
if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
NewArgv[0] = runas_pw->pw_shell;
#endif
/* XXX */
user_env = envp; /* stash for later */
return TRUE;
}
static void
sudoers_policy_close(int exit_status, int error)
{
/* XXX - fill in */
return;
}
static int
sudoers_policy_main(int argc, char * const argv[], char *env_add[],
char **command_infop[], char **argv_out[], char **user_env_out[])
{
static char *command_info[32]; /* XXX */
struct sudo_nss *nss;
char **old_environ = environ;
int cmnd_status = -1, fd, validated, pwflag = 0;
int info_len = 0;
int rval = FALSE;
/* refactor so list can use it too */
/* Is root even allowed to run sudo? */
if (user_uid == 0 && !def_root_sudo) {
warningx("sudoers specifies that root is not allowed to sudo");
goto done;
}
if (sigsetjmp(error_jmp, 1)) {
/* error recovery via error(), errorx() or log_error() */
return -1;
}
/* Local copy of argv */
NewArgv = emalloc2(argc + 1, sizeof(char *));
memcpy(NewArgv, argv, argc * sizeof(char *));
NewArgv[argc] = NULL;
NewArgc = argc;
/* Set environ to contents of user_env. */
env_init(user_env);
#ifdef USING_NONUNIX_GROUPS
sudo_nonunix_groupcheck_init(); /* initialise nonunix groups impl */
#endif /* USING_NONUNIX_GROUPS */
/* Find command in path */
cmnd_status = set_cmnd(sudo_mode);
if (cmnd_status == -1) {
rval = -1;
goto done;
}
#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
/*
* Check sudoers sources.
*/
validated = FLAG_NO_USER | FLAG_NO_HOST;
tq_foreach_fwd(snl, nss) {
validated = nss->lookup(nss, validated, pwflag);
if (ISSET(validated, VALIDATE_OK)) {
/* Handle "= auth" in netsvc.conf */
if (nss->ret_if_found)
break;
} else {
/* Handle [NOTFOUND=return] */
if (nss->ret_if_notfound)
break;
}
}
#ifdef USING_NONUNIX_GROUPS
/* Finished with the groupcheck code */
sudo_nonunix_groupcheck_cleanup();
#endif
if (safe_cmnd == NULL)
safe_cmnd = estrdup(user_cmnd);
#ifdef HAVE_SETLOCALE
setlocale(LC_ALL, "");
#endif
/* If only a group was specified, set runas_pw based on invoking user. */
if (runas_pw == NULL)
set_runaspw(user_name);
/*
* Look up the timestamp dir owner if one is specified.
*/
if (def_timestampowner) {
struct passwd *pw;
if (*def_timestampowner == '#')
pw = sudo_getpwuid(atoi(def_timestampowner + 1));
else
pw = sudo_getpwnam(def_timestampowner);
if (!pw)
log_error(0, "timestamp owner (%s): No such user",
def_timestampowner);
timestamp_uid = pw->pw_uid;
}
/* If given the -P option, set the "preserve_groups" flag. */
if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
def_preserve_groups = TRUE;
/* If no command line args and "set_home" is not set, error out. */
if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs) {
/* XXX - error message */
goto done;
}
/* Bail if a tty is required and we don't have one. */
if (def_requiretty) {
if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
//audit_failure(NewArgv, "no tty");
warningx("sorry, you must have a tty to run sudo");
goto done;
} else
(void) close(fd);
}
/* User may have overridden environment resetting via the -E flag. */
if (ISSET(sudo_mode, MODE_PRESERVE_ENV) && def_setenv)
def_env_reset = FALSE;
/* Build a new environment that avoids any nasty bits. */
rebuild_env(sudo_mode, def_noexec);
/* Fill in passwd struct based on user we are authenticating as. */
auth_pw = get_authpw();
/* Require a password if sudoers says so. */
if (def_authenticate) {
rval = check_user(validated, sudo_mode);
if (rval != TRUE)
goto done;
}
/* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
/* XXX - causes confusion when root is not listed in sudoers */
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) {
sudo_user.pw = pw;
#ifdef HAVE_MBR_CHECK_MEMBERSHIP
mbr_uid_to_uuid(user_uid, user_uuid);
#endif
}
}
}
if (!ISSET(validated, VALIDATE_OK)) {
/* XXX - error message */
goto done;
}
/* Finally tell the user if the command did not exist. */
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 done;
} else if (cmnd_status == NOT_FOUND) {
//audit_failure(NewArgv, "%s: command not found", user_cmnd);
warningx("command not found", user_cmnd);
goto done;
}
/* If user specified env vars make sure sudoers allows it. */
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 done;
} else
validate_env_vars(sudo_user.env_vars);
}
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); /* XXX - return val */
/* Cleanup sudoers sources */
tq_foreach_fwd(snl, nss) {
nss->close(nss);
}
if (ISSET(sudo_mode, (MODE_VALIDATE|MODE_CHECK|MODE_LIST)))
goto done;
/*
* Set umask based on sudoers.
* If user's umask is more restrictive, OR in those bits too
* unless umask_override is set.
*/
if (def_umask != 0777) {
mode_t mask = def_umask;
if (!def_umask_override) {
mode_t omask = umask(mask);
mask |= omask;
umask(omask);
}
easprintf(&command_info[info_len++], "umask=0%o", mask);
}
if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
char *p;
/* Convert /bin/sh -> -sh so shell knows it is a login shell */
if ((p = strrchr(NewArgv[0], '/')) == NULL)
p = NewArgv[0];
*p = '-';
NewArgv[0] = p;
/* Set cwd to run user's homedir. */
command_info[info_len++] = fmt_string("cwd", runas_pw->pw_dir);
#if defined(__linux__) || defined(_AIX)
/* Insert system-wide environment variables. */
/* XXX */
read_env_file(_PATH_ENVIRONMENT, TRUE);
#endif
}
/* Insert system-wide environment variables. */
#if 0 /* XXX - add back */
if (def_env_file) {
read_env_file(def_env_file, FALSE);
}
/* Insert user-specified environment variables. */
insert_env_vars(sudo_user.env_vars);
#endif
/* Restore signal handlers before we exec. */
(void) sigaction(SIGINT, &saved_sa_int, NULL);
(void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
(void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
/* Close the password and group files and free up memory. */
sudo_endpwent();
sudo_endgrent();
command_info[info_len++] = fmt_string("command", safe_cmnd);
if (def_stay_setuid) {
easprintf(&command_info[info_len++], "runas_uid=%u", user_uid);
easprintf(&command_info[info_len++], "runas_gid=%u", user_gid);
easprintf(&command_info[info_len++], "runas_euid=%u", runas_pw->pw_uid);
easprintf(&command_info[info_len++], "runas_egid=%u", runas_pw->pw_gid);
} else {
easprintf(&command_info[info_len++], "runas_uid=%u", runas_pw->pw_uid);
easprintf(&command_info[info_len++], "runas_gid=%u", runas_pw->pw_gid);
}
/* Must audit before uid change. */
//audit_success(NewArgv); /* XXX */
*command_infop = command_info;
*argv_out = NewArgv;
*user_env_out = environ; /* actually our local copy */
rval = TRUE;
done:
environ = old_environ;
return rval;
}
static int
sudoers_policy_check(int argc, char * const argv[], char *env_add[],
char **command_infop[], char **argv_out[], char **user_env_out[])
{
SET(sudo_mode, MODE_RUN);
return sudoers_policy_main(argc, argv, env_add, command_infop,
argv_out, user_env_out);
}
static int
sudoers_policy_list(int argc, char * const argv[], int verbose,
const char *list_user)
{
user_cmnd = "list";
if (argc)
SET(sudo_mode, MODE_CHECK);
else
SET(sudo_mode, MODE_LIST);
if (verbose)
long_list = 1;
if (list_user) {
list_pw = sudo_getpwnam(list_user);
warningx("unknown user: %s", optarg);
return -1;
}
return sudoers_policy_main(argc, argv, NULL, NULL, NULL, NULL);
}
/*
* Initialize timezone, set umask, fill in ``sudo_user'' struct and
* load the ``interfaces'' array.
*/
static void
init_vars(char * const envp[])
{
char * const * ep;
#if 0
/* Sanity check command from user. */
if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX)
errorx(1, "%s: File name too long", NewArgv[0]);
#endif
#ifdef HAVE_TZSET
(void) tzset(); /* set the timezone if applicable */
#endif /* HAVE_TZSET */
#if 0
/* Default value for cmnd and cwd, overridden later. */
if (user_cmnd == NULL)
user_cmnd = NewArgv[0];
#endif
for (ep = envp; *ep; ep++) {
/* XXX - don't fill in if empty string */
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;
}
}
/*
* Get a local copy of the user's struct passwd with the shadow password
* if necessary. It is assumed that euid is 0 at this point so we
* can read the shadow passwd file if necessary.
*/
if ((sudo_user.pw = sudo_getpwnam(user_name)) == NULL) {
/* Need to make a fake struct passwd for logging to work. */
/* XXX - really needed now? */
struct passwd pw;
char pw_name[MAX_UID_T_LEN + 1];
pw.pw_uid = getuid();
(void) snprintf(pw_name, sizeof(pw_name), "%lu",
(unsigned long) pw.pw_uid);
pw.pw_name = pw_name;
sudo_user.pw = &pw;
#if 0
/*
* If we are in -k/-K mode, just spew to stderr. It is not unusual for
* users to place "sudo -k" in a .logout file which can cause sudo to
* be run during reboot after the YP/NIS/NIS+/LDAP/etc daemon has died.
*/
if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE)
errorx(1, "unknown uid: %s", pw_name);
log_error(0, "unknown uid: %s", pw_name);
#endif
}
#ifdef HAVE_MBR_CHECK_MEMBERSHIP
mbr_uid_to_uuid(user_uid, user_uuid);
#endif
if (user_shell == NULL || *user_shell == '\0')
user_shell = estrdup(sudo_user.pw->pw_shell);
/* It is now safe to use log_error() and set_perms() */
if (def_fqdn) {
/* may call log_error() */
set_fqdn();
}
#if 0 /* XXX need to adapt this in sudo.c */
/*
* If we were given the '-e', '-i' or '-s' options we need to redo
* NewArgv and NewArgc.
*/
if (ISSET(sudo_mode, MODE_EDIT)) {
NewArgv--;
NewArgc++;
NewArgv[0] = "sudoedit";
} else if (ISSET(sudo_mode, MODE_SHELL)) {
char **av;
/* Allocate an extra slot for execve() failure (ENOEXEC). */
av = (char **) emalloc2(5, sizeof(char *));
av++;
av[0] = user_shell; /* may be updated later */
if (NewArgc > 0) {
size_t size;
char *cmnd, *src, *dst, *end;
size = (size_t) (NewArgv[NewArgc - 1] - NewArgv[0]) +
strlen(NewArgv[NewArgc - 1]) + 1;
cmnd = emalloc(size);
src = NewArgv[0];
dst = cmnd;
for (end = src + size - 1; src < end; src++, dst++)
*dst = *src == 0 ? ' ' : *src;
*dst = '\0';
av[1] = "-c";
av[2] = cmnd;
NewArgc = 2;
}
av[++NewArgc] = NULL;
NewArgv = av;
}
#endif
}
/*
* Fill in user_cmnd, user_args, user_base and user_stat variables
* and apply any command-specific defaults entries.
*/
static int
set_cmnd(sudo_mode)
int sudo_mode;
{
int rval;
/* Set project if applicable. */
set_project(runas_pw);
/* Resolve the path and return. */
rval = FOUND;
user_stat = emalloc(sizeof(struct stat));
if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) {
if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) {
set_perms(PERM_RUNAS);
rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
set_perms(PERM_ROOT);
if (rval != FOUND) {
/* Failed as root, try as invoking user. */
set_perms(PERM_USER);
rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
set_perms(PERM_ROOT);
}
}
/* set user_args */
if (NewArgc > 1) {
char *to, **from;
size_t size, n;
/* If we didn't realloc NewArgv it is contiguous so just count. */
if (!ISSET(sudo_mode, MODE_SHELL)) {
size = (size_t) (NewArgv[NewArgc-1] - NewArgv[1]) +
strlen(NewArgv[NewArgc-1]) + 1;
} else {
for (size = 0, from = NewArgv + 1; *from; from++)
size += strlen(*from) + 1;
}
/* Alloc and build up user_args. */
user_args = emalloc(size);
for (to = user_args, from = NewArgv + 1; *from; from++) {
n = strlcpy(to, *from, 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|NO_EXIT, "problem with defaults entries");
if (!runas_user && !runas_group)
set_runaspw(def_runas_default); /* may have been updated above */
return(rval);
}
/*
* Open sudoers and sanity check mode/owner/type.
* Returns a handle to the sudoers file or NULL on error.
*/
FILE *
open_sudoers(sudoers, doedit, keepopen)
const char *sudoers;
int doedit;
int *keepopen;
{
struct stat statbuf;
FILE *fp = NULL;
int rootstat;
/*
* Fix the mode and group on sudoers file from old default.
* Only works if file system is readable/writable by root.
*/
if ((rootstat = stat_sudoers(sudoers, &statbuf)) == 0 &&
SUDOERS_UID == statbuf.st_uid && SUDOERS_MODE != 0400 &&
(statbuf.st_mode & 0007777) == 0400) {
if (chmod(sudoers, SUDOERS_MODE) == 0) {
warningx("fixed mode on %s", sudoers);
SET(statbuf.st_mode, SUDOERS_MODE);
if (statbuf.st_gid != SUDOERS_GID) {
if (chown(sudoers, (uid_t) -1, SUDOERS_GID) == 0) {
warningx("set group on %s", sudoers);
statbuf.st_gid = SUDOERS_GID;
} else
warning("unable to set group on %s", sudoers);
}
} else
warning("unable to fix mode on %s", sudoers);
}
/*
* Sanity checks on sudoers file. Must be done as sudoers
* file owner. We already did a stat as root, so use that
* data if we can't stat as sudoers file owner.
*/
set_perms(PERM_SUDOERS);
if (rootstat != 0 && stat_sudoers(sudoers, &statbuf) != 0)
log_error(USE_ERRNO|NO_EXIT, "can't stat %s", sudoers);
else if (!S_ISREG(statbuf.st_mode))
log_error(NO_EXIT, "%s is not a regular file", sudoers);
else if ((statbuf.st_mode & 07777) != SUDOERS_MODE)
log_error(NO_EXIT, "%s is mode 0%o, should be 0%o", sudoers,
(unsigned int) (statbuf.st_mode & 07777),
(unsigned int) SUDOERS_MODE);
else if (statbuf.st_uid != SUDOERS_UID)
log_error(NO_EXIT, "%s is owned by uid %lu, should be %lu", sudoers,
(unsigned long) statbuf.st_uid, (unsigned long) SUDOERS_UID);
else if (statbuf.st_gid != SUDOERS_GID)
log_error(NO_EXIT, "%s is owned by gid %lu, should be %lu", sudoers,
(unsigned long) statbuf.st_gid, (unsigned long) SUDOERS_GID);
else if ((fp = fopen(sudoers, "r")) == NULL)
log_error(USE_ERRNO|NO_EXIT, "can't open %s", sudoers);
else {
/*
* Make sure we can actually read sudoers so we can present the
* user with a reasonable error message (unlike the lexer).
*/
if (statbuf.st_size != 0 && fgetc(fp) == EOF) {
log_error(USE_ERRNO|NO_EXIT, "can't read %s", sudoers);
fclose(fp);
fp = NULL;
}
}
if (fp != NULL) {
rewind(fp);
(void) fcntl(fileno(fp), F_SETFD, 1);
}
set_perms(PERM_ROOT); /* change back to root */
return(fp);
}
#ifdef HAVE_LOGIN_CAP_H
static void
set_loginclass(pw)
struct passwd *pw;
{
int errflags;
/*
* Don't make it a fatal error if the user didn't specify the login
* class themselves. We do this because if login.conf gets
* corrupted we want the admin to be able to use sudo to fix it.
*/
if (login_class)
errflags = NO_MAIL|MSG_ONLY;
else
errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
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) {
log_error(errflags, "unknown login class: %s", login_class);
if (!lc)
lc = login_getclass(NULL); /* needed for login_getstyle() later */
}
}
#else
static void
set_loginclass(pw)
struct passwd *pw;
{
}
#endif /* HAVE_LOGIN_CAP_H */
#ifdef HAVE_PROJECT_H
static void
set_project(pw)
struct passwd *pw;
{
int errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
int errval;
struct project proj;
struct project *resultp = '\0';
char buf[1024];
/*
* Collect the default project for the user and settaskid
*/
setprojent();
if (resultp = getdefaultproj(pw->pw_name, &proj, buf, sizeof(buf))) {
errval = setproject(resultp->pj_name, pw->pw_name, TASK_NORMAL);
if (errval != 0) {
switch(errval) {
case SETPROJ_ERR_TASK:
if (errno == EAGAIN)
log_error(errflags, "resource control limit has been reached");
else if (errno == ESRCH)
log_error(errflags, "user \"%s\" is not a member of "
"project \"%s\"", pw->pw_name, resultp->pj_name);
else if (errno == EACCES)
log_error(errflags, "the invoking task is final");
else
log_error(errflags, "could not join project \"%s\"",
resultp->pj_name);
break;
case SETPROJ_ERR_POOL:
if (errno == EACCES)
log_error(errflags, "no resource pool accepting "
"default bindings exists for project \"%s\"",
resultp->pj_name);
else if (errno == ESRCH)
log_error(errflags, "specified resource pool does "
"not exist for project \"%s\"", resultp->pj_name);
else
log_error(errflags, "could not bind to default "
"resource pool for project \"%s\"", resultp->pj_name);
break;
default:
if (errval <= 0) {
log_error(errflags, "setproject failed for project \"%s\"",
resultp->pj_name);
} else {
log_error(errflags, "warning, resource control assignment "
"failed for project \"%s\"", resultp->pj_name);
}
}
}
} else {
log_error(errflags, "getdefaultproj() error: %s", strerror(errno));
}
endprojent();
}
#else
static void
set_project(pw)
struct passwd *pw;
{
}
#endif /* HAVE_PROJECT_H */
/*
* Look up the fully qualified domain name and set user_host and user_shost.
*/
void
set_fqdn(void)
{
#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_CANONNAME;
if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
#else
if (!(hp = gethostbyname(user_host))) {
#endif
log_error(MSG_ONLY|NO_EXIT,
"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, '.')) != NULL)
user_shost = estrndup(user_host, (size_t)(p - user_host));
else
user_shost = user_host;
}
/*
* Get passwd entry for the user we are going to run commands as.
* By default, this is "root". Updates runas_pw as a side effect.
*/
static void
set_runaspw(user)
char *user;
{
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_error(NO_MAIL|MSG_ONLY, "unknown user: %s", user);
}
}
}
/*
* Get group entry for the group we are going to run commands as.
* Updates runas_pw as a side effect.
*/
static void
set_runasgr(group)
char *group;
{
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_error(NO_MAIL|MSG_ONLY, "unknown group: %s", group);
}
}
/*
* Get passwd entry for the user we are going to authenticate as.
* By default, this is the user invoking sudo. In the most common
* case, this matches sudo_user.pw or runas_pw.
*/
static struct passwd *
get_authpw()
{
struct passwd *pw;
if (def_rootpw) {
if ((pw = sudo_getpwuid(0)) == NULL)
log_error(0, "unknown uid: 0");
} else if (def_runaspw) {
if ((pw = sudo_getpwnam(def_runas_default)) == NULL)
log_error(0, "unknown user: %s", def_runas_default);
} else if (def_targetpw) {
if (runas_pw->pw_name == NULL)
log_error(NO_MAIL|MSG_ONLY, "unknown uid: %lu",
(unsigned long) runas_pw->pw_uid);
pw = runas_pw;
} else
pw = sudo_user.pw;
return(pw);
}
/*
* Cleanup hook for error()/errorx()
*/
void
cleanup(gotsignal)
int gotsignal;
{
struct sudo_nss *nss;
if (!gotsignal) {
if (snl != NULL) {
tq_foreach_fwd(snl, nss)
nss->close(nss);
}
sudo_endpwent();
sudo_endgrent();
}
#ifdef notyet
/* XXX */
if (def_transcript)
term_restore(STDIN_FILENO, 0);
#endif
}
static int
sudoers_policy_version(int verbose)
{
struct sudo_conv_message msg;
struct sudo_conv_reply repl;
char *str;
easprintf(&str, "Sudoers plugin version %s\n", PACKAGE_VERSION);
/* Call conversation function */
memset(&msg, 0, sizeof(msg));
msg.msg_type = SUDO_CONV_INFO_MSG;
msg.msg = str;
memset(&repl, 0, sizeof(repl));
sudo_conv(1, &msg, &repl);
#ifdef notyet
if (verbose) {
putchar('\n');
(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();
}
#endif
return TRUE;
}
static int
deserialize_info(char * const settings[], char * const user_info[])
{
char * const *cur;
const char *p;
int flags = 0;
#define MATCHES(s, v) (strncmp(s, v, sizeof(v) - 1) == 0)
/* Parse command line settings. */
for (cur = settings; *cur != NULL; cur++) {
if (MATCHES(*cur, "debug_level=")) {
debug_level = atoi(*cur + sizeof("debug_level=") - 1);
continue;
}
if (MATCHES(*cur, "runas_user=")) {
runas_user = *cur + sizeof("runas_user=") - 1;
continue;
}
if (MATCHES(*cur, "runas_group=")) {
runas_group = *cur + sizeof("runas_group=") - 1;
continue;
}
if (MATCHES(*cur, "prompt=")) {
user_prompt = *cur + sizeof("prompt=") - 1;
def_passprompt_override = TRUE;
continue;
}
if (MATCHES(*cur, "set_home=")) {
if (atobool(*cur + sizeof("set_home=") - 1) == TRUE)
SET(flags, MODE_RESET_HOME);
continue;
}
if (MATCHES(*cur, "preserve_environment=")) {
if (atobool(*cur + sizeof("preserve_environment=") - 1) == TRUE)
SET(flags, MODE_PRESERVE_ENV);
continue;
}
if (MATCHES(*cur, "login_shell=")) {
if (atobool(*cur + sizeof("login_shell=") - 1) == TRUE) {
SET(flags, MODE_LOGIN_SHELL);
def_env_reset = TRUE;
}
continue;
}
if (MATCHES(*cur, "preserve_groups=")) {
SET(flags, MODE_PRESERVE_GROUPS);
continue;
}
if (MATCHES(*cur, "ignore_ticket=")) {
SET(flags, MODE_IGNORE_TICKET);
continue;
}
if (MATCHES(*cur, "login_class=")) {
login_class = *cur + sizeof("login_class=") - 1;
def_use_loginclass = TRUE;
continue;
}
#ifdef HAVE_SELINUX
if (MATCHES(*cur, "selinux_role=")) {
user_role = *cur + sizeof("selinux_role=") - 1;
continue;
}
if (MATCHES(*cur, "selinux_type=")) {
user_role = *cur + sizeof("selinux_type=") - 1;
continue;
}
#endif /* HAVE_SELINUX */
#ifdef HAVE_BSD_AUTH_H
if (MATCHES(*cur, "bsdauth_type=")) {
login_style = *cur + sizeof("bsdauth_type=") - 1;
continue;
}
#endif /* HAVE_BSD_AUTH_H */
}
for (cur = user_info; *cur != NULL; cur++) {
if (MATCHES(*cur, "user=")) {
user_name = estrdup(*cur + sizeof("user=") - 1);
continue;
}
if (MATCHES(*cur, "uid=")) {
user_uid = atoi(*cur + sizeof("uid=") - 1);
continue;
}
if (MATCHES(*cur, "gid=")) {
user_gid = atoi(*cur + sizeof("gid=") - 1);
continue;
}
if (MATCHES(*cur, "groups=")) {
/* Count number of groups */
const char *val = *cur + sizeof("groups=") - 1;
const char *cp;
for (cp = val; *cp != '\0'; cp++) {
if (*cp == ',')
user_ngroups++;
}
if (user_ngroups) {
user_groups = emalloc2(user_ngroups, sizeof(gid_t));
user_ngroups = 0;
cp = val;
for (;;) {
/* XXX - strtol would be better here */
user_groups[user_ngroups++] = atoi(cp);
cp = strchr(cp, ',');
if (cp == NULL)
break;
cp++; /* skip over comma */
}
}
continue;
}
if (MATCHES(*cur, "cwd=")) {
user_cwd = estrdup(*cur + sizeof("cwd=") - 1);
continue;
}
if (MATCHES(*cur, "tty=")) {
user_tty = user_ttypath = estrdup(*cur + sizeof("tty=") - 1);
if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
user_tty += sizeof(_PATH_DEV) - 1;
continue;
}
if (MATCHES(*cur, "host=")) {
user_host = user_shost = estrdup(*cur + sizeof("host=") - 1);
if ((p = strchr(user_host, '.')))
user_shost = estrndup(user_host, (size_t)(p - user_host));
continue;
}
}
#undef MATCHES
return flags;
}
struct policy_plugin sudoers_policy = {
SUDO_POLICY_PLUGIN,
SUDO_API_VERSION,
sudoers_policy_open,
sudoers_policy_close,
sudoers_policy_version,
sudoers_policy_check,
sudoers_policy_list,
#ifdef notyet
sudoers_policy_validate,
sudoers_policy_invalidate
#endif
};
#ifdef notyet
struct io_plugin sudoers_io = {
SUDO_IO_PLUGIN,
SUDO_API_VERSION,
io_open,
io_close,
io_version,
io_log_input,
io_log_output
};
#endif
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