2966d28c32
setenv(3) by tracking the size of the memory allocated instead of using strlen() on the current value. Convert all calls to POSIX from historic BSD API: - unsetenv returns an int. - putenv takes a char * instead of const char *. - putenv no longer makes a copy of the input string. - errno is set appropriately for POSIX. Exceptions involve bad environ variable and internal initialization code. These both set errno to EFAULT. Several patches to base utilities to handle the POSIX changes from Andrey Chernov's previous commit. A few I re-wrote to use setenv() instead of putenv(). New regression module for tools/regression/environ to test these functions. It also can be used to test the performance. Bump __FreeBSD_version to 700050 due to API change. PR: kern/99826 Approved by: wes Approved by: re (kensmith)
645 lines
17 KiB
C
645 lines
17 KiB
C
/*
|
|
* Copyright (c) 2002, 2005 Networks Associates Technologies, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Portions of this software were developed for the FreeBSD Project by
|
|
* ThinkSec AS and NAI Labs, the Security Research Division of Network
|
|
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
|
|
* ("CBOSS"), as part of the DARPA CHATS research program.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
/*-
|
|
* Copyright (c) 1988, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char copyright[] =
|
|
"@(#) Copyright (c) 1988, 1993, 1994\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#if 0
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)su.c 8.3 (Berkeley) 4/2/94";
|
|
#endif /* not lint */
|
|
#endif
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/wait.h>
|
|
|
|
#ifdef USE_BSM_AUDIT
|
|
#include <bsm/libbsm.h>
|
|
#include <bsm/audit_uevents.h>
|
|
#endif
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <grp.h>
|
|
#include <login_cap.h>
|
|
#include <paths.h>
|
|
#include <pwd.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <unistd.h>
|
|
#include <stdarg.h>
|
|
|
|
#include <security/pam_appl.h>
|
|
#include <security/openpam.h>
|
|
|
|
#define PAM_END() do { \
|
|
int local_ret; \
|
|
if (pamh != NULL) { \
|
|
local_ret = pam_setcred(pamh, PAM_DELETE_CRED); \
|
|
if (local_ret != PAM_SUCCESS) \
|
|
syslog(LOG_ERR, "pam_setcred: %s", \
|
|
pam_strerror(pamh, local_ret)); \
|
|
if (asthem) { \
|
|
local_ret = pam_close_session(pamh, 0); \
|
|
if (local_ret != PAM_SUCCESS) \
|
|
syslog(LOG_ERR, "pam_close_session: %s",\
|
|
pam_strerror(pamh, local_ret)); \
|
|
} \
|
|
local_ret = pam_end(pamh, local_ret); \
|
|
if (local_ret != PAM_SUCCESS) \
|
|
syslog(LOG_ERR, "pam_end: %s", \
|
|
pam_strerror(pamh, local_ret)); \
|
|
} \
|
|
} while (0)
|
|
|
|
|
|
#define PAM_SET_ITEM(what, item) do { \
|
|
int local_ret; \
|
|
local_ret = pam_set_item(pamh, what, item); \
|
|
if (local_ret != PAM_SUCCESS) { \
|
|
syslog(LOG_ERR, "pam_set_item(" #what "): %s", \
|
|
pam_strerror(pamh, local_ret)); \
|
|
errx(1, "pam_set_item(" #what "): %s", \
|
|
pam_strerror(pamh, local_ret)); \
|
|
/* NOTREACHED */ \
|
|
} \
|
|
} while (0)
|
|
|
|
enum tristate { UNSET, YES, NO };
|
|
|
|
static pam_handle_t *pamh = NULL;
|
|
static char **environ_pam;
|
|
|
|
static char *ontty(void);
|
|
static int chshell(const char *);
|
|
static void usage(void) __dead2;
|
|
static void export_pam_environment(void);
|
|
static int ok_to_export(const char *);
|
|
|
|
extern char **environ;
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
static char *cleanenv;
|
|
struct passwd *pwd;
|
|
struct pam_conv conv = { openpam_ttyconv, NULL };
|
|
enum tristate iscsh;
|
|
login_cap_t *lc;
|
|
union {
|
|
const char **a;
|
|
char * const *b;
|
|
} np;
|
|
uid_t ruid;
|
|
pid_t child_pid, child_pgrp, pid;
|
|
int asme, ch, asthem, fastlogin, prio, i, retcode,
|
|
statusp, setmaclabel;
|
|
u_int setwhat;
|
|
char *username, *class, shellbuf[MAXPATHLEN];
|
|
const char *p, *user, *shell, *mytty, **nargv;
|
|
struct sigaction sa, sa_int, sa_quit, sa_pipe;
|
|
int temp, fds[2];
|
|
#ifdef USE_BSM_AUDIT
|
|
const char *aerr;
|
|
au_id_t auid;
|
|
#endif
|
|
|
|
shell = class = cleanenv = NULL;
|
|
asme = asthem = fastlogin = statusp = 0;
|
|
user = "root";
|
|
iscsh = UNSET;
|
|
setmaclabel = 0;
|
|
|
|
while ((ch = getopt(argc, argv, "-flmsc:")) != -1)
|
|
switch ((char)ch) {
|
|
case 'f':
|
|
fastlogin = 1;
|
|
break;
|
|
case '-':
|
|
case 'l':
|
|
asme = 0;
|
|
asthem = 1;
|
|
break;
|
|
case 'm':
|
|
asme = 1;
|
|
asthem = 0;
|
|
break;
|
|
case 's':
|
|
setmaclabel = 1;
|
|
break;
|
|
case 'c':
|
|
class = optarg;
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
if (optind < argc)
|
|
user = argv[optind++];
|
|
|
|
if (user == NULL)
|
|
usage();
|
|
/* NOTREACHED */
|
|
|
|
/*
|
|
* Try to provide more helpful debugging output if su(1) is running
|
|
* non-setuid, or was run from a file system not mounted setuid.
|
|
*/
|
|
if (geteuid() != 0)
|
|
errx(1, "not running setuid");
|
|
|
|
#ifdef USE_BSM_AUDIT
|
|
if (getauid(&auid) < 0 && errno != ENOSYS) {
|
|
syslog(LOG_AUTH | LOG_ERR, "getauid: %s", strerror(errno));
|
|
errx(1, "Permission denied");
|
|
}
|
|
#endif
|
|
if (strlen(user) > MAXLOGNAME - 1) {
|
|
#ifdef USE_BSM_AUDIT
|
|
if (audit_submit(AUE_su, auid,
|
|
1, EPERM, "username too long: '%s'", user))
|
|
errx(1, "Permission denied");
|
|
#endif
|
|
errx(1, "username too long");
|
|
}
|
|
|
|
nargv = malloc(sizeof(char *) * (size_t)(argc + 4));
|
|
if (nargv == NULL)
|
|
errx(1, "malloc failure");
|
|
|
|
nargv[argc + 3] = NULL;
|
|
for (i = argc; i >= optind; i--)
|
|
nargv[i + 3] = argv[i];
|
|
np.a = &nargv[i + 3];
|
|
|
|
argv += optind;
|
|
|
|
errno = 0;
|
|
prio = getpriority(PRIO_PROCESS, 0);
|
|
if (errno)
|
|
prio = 0;
|
|
|
|
setpriority(PRIO_PROCESS, 0, -2);
|
|
openlog("su", LOG_CONS, LOG_AUTH);
|
|
|
|
/* get current login name, real uid and shell */
|
|
ruid = getuid();
|
|
username = getlogin();
|
|
pwd = getpwnam(username);
|
|
if (username == NULL || pwd == NULL || pwd->pw_uid != ruid)
|
|
pwd = getpwuid(ruid);
|
|
if (pwd == NULL) {
|
|
#ifdef USE_BSM_AUDIT
|
|
if (audit_submit(AUE_su, auid, 1, EPERM,
|
|
"unable to determine invoking subject: '%s'", username))
|
|
errx(1, "Permission denied");
|
|
#endif
|
|
errx(1, "who are you?");
|
|
}
|
|
|
|
username = strdup(pwd->pw_name);
|
|
if (username == NULL)
|
|
err(1, "strdup failure");
|
|
|
|
if (asme) {
|
|
if (pwd->pw_shell != NULL && *pwd->pw_shell != '\0') {
|
|
/* must copy - pwd memory is recycled */
|
|
shell = strncpy(shellbuf, pwd->pw_shell,
|
|
sizeof(shellbuf));
|
|
shellbuf[sizeof(shellbuf) - 1] = '\0';
|
|
}
|
|
else {
|
|
shell = _PATH_BSHELL;
|
|
iscsh = NO;
|
|
}
|
|
}
|
|
|
|
/* Do the whole PAM startup thing */
|
|
retcode = pam_start("su", user, &conv, &pamh);
|
|
if (retcode != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, retcode));
|
|
errx(1, "pam_start: %s", pam_strerror(pamh, retcode));
|
|
}
|
|
|
|
PAM_SET_ITEM(PAM_RUSER, username);
|
|
|
|
mytty = ttyname(STDERR_FILENO);
|
|
if (!mytty)
|
|
mytty = "tty";
|
|
PAM_SET_ITEM(PAM_TTY, mytty);
|
|
|
|
retcode = pam_authenticate(pamh, 0);
|
|
if (retcode != PAM_SUCCESS) {
|
|
#ifdef USE_BSM_AUDIT
|
|
if (audit_submit(AUE_su, auid, 1, EPERM, "bad su %s to %s on %s",
|
|
username, user, mytty))
|
|
errx(1, "Permission denied");
|
|
#endif
|
|
syslog(LOG_AUTH|LOG_WARNING, "BAD SU %s to %s on %s",
|
|
username, user, mytty);
|
|
errx(1, "Sorry");
|
|
}
|
|
#ifdef USE_BSM_AUDIT
|
|
if (audit_submit(AUE_su, auid, 0, 0, "successful authentication"))
|
|
errx(1, "Permission denied");
|
|
#endif
|
|
retcode = pam_get_item(pamh, PAM_USER, (const void **)&p);
|
|
if (retcode == PAM_SUCCESS)
|
|
user = p;
|
|
else
|
|
syslog(LOG_ERR, "pam_get_item(PAM_USER): %s",
|
|
pam_strerror(pamh, retcode));
|
|
pwd = getpwnam(user);
|
|
if (pwd == NULL) {
|
|
#ifdef USE_BSM_AUDIT
|
|
if (audit_submit(AUE_su, auid, 1, EPERM,
|
|
"unknown subject: %s", user))
|
|
errx(1, "Permission denied");
|
|
#endif
|
|
errx(1, "unknown login: %s", user);
|
|
}
|
|
|
|
retcode = pam_acct_mgmt(pamh, 0);
|
|
if (retcode == PAM_NEW_AUTHTOK_REQD) {
|
|
retcode = pam_chauthtok(pamh,
|
|
PAM_CHANGE_EXPIRED_AUTHTOK);
|
|
if (retcode != PAM_SUCCESS) {
|
|
#ifdef USE_BSM_AUDIT
|
|
aerr = pam_strerror(pamh, retcode);
|
|
if (aerr == NULL)
|
|
aerr = "Unknown PAM error";
|
|
if (audit_submit(AUE_su, auid, 1, EPERM,
|
|
"pam_chauthtok: %s", aerr))
|
|
errx(1, "Permission denied");
|
|
#endif
|
|
syslog(LOG_ERR, "pam_chauthtok: %s",
|
|
pam_strerror(pamh, retcode));
|
|
errx(1, "Sorry");
|
|
}
|
|
}
|
|
if (retcode != PAM_SUCCESS) {
|
|
#ifdef USE_BSM_AUDIT
|
|
if (audit_submit(AUE_su, auid, 1, EPERM, "pam_acct_mgmt: %s",
|
|
pam_strerror(pamh, retcode)))
|
|
errx(1, "Permission denied");
|
|
#endif
|
|
syslog(LOG_ERR, "pam_acct_mgmt: %s",
|
|
pam_strerror(pamh, retcode));
|
|
errx(1, "Sorry");
|
|
}
|
|
|
|
/* get target login information */
|
|
if (class == NULL)
|
|
lc = login_getpwclass(pwd);
|
|
else {
|
|
if (ruid != 0) {
|
|
#ifdef USE_BSM_AUDIT
|
|
if (audit_submit(AUE_su, auid, 1, EPERM,
|
|
"only root may use -c"))
|
|
errx(1, "Permission denied");
|
|
#endif
|
|
errx(1, "only root may use -c");
|
|
}
|
|
lc = login_getclass(class);
|
|
if (lc == NULL)
|
|
errx(1, "unknown class: %s", class);
|
|
}
|
|
|
|
/* if asme and non-standard target shell, must be root */
|
|
if (asme) {
|
|
if (ruid != 0 && !chshell(pwd->pw_shell))
|
|
errx(1, "permission denied (shell)");
|
|
}
|
|
else if (pwd->pw_shell && *pwd->pw_shell) {
|
|
shell = pwd->pw_shell;
|
|
iscsh = UNSET;
|
|
}
|
|
else {
|
|
shell = _PATH_BSHELL;
|
|
iscsh = NO;
|
|
}
|
|
|
|
/* if we're forking a csh, we want to slightly muck the args */
|
|
if (iscsh == UNSET) {
|
|
p = strrchr(shell, '/');
|
|
if (p)
|
|
++p;
|
|
else
|
|
p = shell;
|
|
iscsh = strcmp(p, "csh") ? (strcmp(p, "tcsh") ? NO : YES) : YES;
|
|
}
|
|
setpriority(PRIO_PROCESS, 0, prio);
|
|
|
|
/*
|
|
* PAM modules might add supplementary groups in pam_setcred(), so
|
|
* initialize them first.
|
|
*/
|
|
if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) < 0)
|
|
err(1, "setusercontext");
|
|
|
|
retcode = pam_setcred(pamh, PAM_ESTABLISH_CRED);
|
|
if (retcode != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_setcred: %s",
|
|
pam_strerror(pamh, retcode));
|
|
errx(1, "failed to establish credentials.");
|
|
}
|
|
if (asthem) {
|
|
retcode = pam_open_session(pamh, 0);
|
|
if (retcode != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_open_session: %s",
|
|
pam_strerror(pamh, retcode));
|
|
errx(1, "failed to open session.");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We must fork() before setuid() because we need to call
|
|
* pam_setcred(pamh, PAM_DELETE_CRED) as root.
|
|
*/
|
|
sa.sa_flags = SA_RESTART;
|
|
sa.sa_handler = SIG_IGN;
|
|
sigemptyset(&sa.sa_mask);
|
|
sigaction(SIGINT, &sa, &sa_int);
|
|
sigaction(SIGQUIT, &sa, &sa_quit);
|
|
sigaction(SIGPIPE, &sa, &sa_pipe);
|
|
sa.sa_handler = SIG_DFL;
|
|
sigaction(SIGTSTP, &sa, NULL);
|
|
statusp = 1;
|
|
if (pipe(fds) == -1) {
|
|
PAM_END();
|
|
err(1, "pipe");
|
|
}
|
|
child_pid = fork();
|
|
switch (child_pid) {
|
|
default:
|
|
sa.sa_handler = SIG_IGN;
|
|
sigaction(SIGTTOU, &sa, NULL);
|
|
close(fds[0]);
|
|
setpgid(child_pid, child_pid);
|
|
if (tcgetpgrp(STDERR_FILENO) == getpgrp())
|
|
tcsetpgrp(STDERR_FILENO, child_pid);
|
|
close(fds[1]);
|
|
sigaction(SIGPIPE, &sa_pipe, NULL);
|
|
while ((pid = waitpid(child_pid, &statusp, WUNTRACED)) != -1) {
|
|
if (WIFSTOPPED(statusp)) {
|
|
child_pgrp = getpgid(child_pid);
|
|
if (tcgetpgrp(STDERR_FILENO) == child_pgrp)
|
|
tcsetpgrp(STDERR_FILENO, getpgrp());
|
|
kill(getpid(), SIGSTOP);
|
|
if (tcgetpgrp(STDERR_FILENO) == getpgrp()) {
|
|
child_pgrp = getpgid(child_pid);
|
|
tcsetpgrp(STDERR_FILENO, child_pgrp);
|
|
}
|
|
kill(child_pid, SIGCONT);
|
|
statusp = 1;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
child_pgrp = getpgid(child_pid);
|
|
if (tcgetpgrp(STDERR_FILENO) == child_pgrp)
|
|
tcsetpgrp(STDERR_FILENO, getpgrp());
|
|
if (pid == -1)
|
|
err(1, "waitpid");
|
|
PAM_END();
|
|
exit(WEXITSTATUS(statusp));
|
|
case -1:
|
|
PAM_END();
|
|
err(1, "fork");
|
|
case 0:
|
|
close(fds[1]);
|
|
read(fds[0], &temp, 1);
|
|
close(fds[0]);
|
|
sigaction(SIGPIPE, &sa_pipe, NULL);
|
|
sigaction(SIGINT, &sa_int, NULL);
|
|
sigaction(SIGQUIT, &sa_quit, NULL);
|
|
|
|
/*
|
|
* Set all user context except for: Environmental variables
|
|
* Umask Login records (wtmp, etc) Path
|
|
*/
|
|
setwhat = LOGIN_SETALL & ~(LOGIN_SETENV | LOGIN_SETUMASK |
|
|
LOGIN_SETLOGIN | LOGIN_SETPATH | LOGIN_SETGROUP |
|
|
LOGIN_SETMAC);
|
|
/*
|
|
* If -s is present, also set the MAC label.
|
|
*/
|
|
if (setmaclabel)
|
|
setwhat |= LOGIN_SETMAC;
|
|
/*
|
|
* Don't touch resource/priority settings if -m has been used
|
|
* or -l and -c hasn't, and we're not su'ing to root.
|
|
*/
|
|
if ((asme || (!asthem && class == NULL)) && pwd->pw_uid)
|
|
setwhat &= ~(LOGIN_SETPRIORITY | LOGIN_SETRESOURCES);
|
|
if (setusercontext(lc, pwd, pwd->pw_uid, setwhat) < 0)
|
|
err(1, "setusercontext");
|
|
|
|
if (!asme) {
|
|
if (asthem) {
|
|
p = getenv("TERM");
|
|
environ = &cleanenv;
|
|
}
|
|
|
|
if (asthem || pwd->pw_uid)
|
|
setenv("USER", pwd->pw_name, 1);
|
|
setenv("HOME", pwd->pw_dir, 1);
|
|
setenv("SHELL", shell, 1);
|
|
|
|
if (asthem) {
|
|
/*
|
|
* Add any environmental variables that the
|
|
* PAM modules may have set.
|
|
*/
|
|
environ_pam = pam_getenvlist(pamh);
|
|
if (environ_pam)
|
|
export_pam_environment();
|
|
|
|
/* set the su'd user's environment & umask */
|
|
setusercontext(lc, pwd, pwd->pw_uid,
|
|
LOGIN_SETPATH | LOGIN_SETUMASK |
|
|
LOGIN_SETENV);
|
|
if (p)
|
|
setenv("TERM", p, 1);
|
|
|
|
p = pam_getenv(pamh, "HOME");
|
|
if (chdir(p ? p : pwd->pw_dir) < 0)
|
|
errx(1, "no directory");
|
|
}
|
|
}
|
|
login_close(lc);
|
|
|
|
if (iscsh == YES) {
|
|
if (fastlogin)
|
|
*np.a-- = "-f";
|
|
if (asme)
|
|
*np.a-- = "-m";
|
|
}
|
|
/* csh strips the first character... */
|
|
*np.a = asthem ? "-su" : iscsh == YES ? "_su" : "su";
|
|
|
|
if (ruid != 0)
|
|
syslog(LOG_NOTICE, "%s to %s%s", username, user,
|
|
ontty());
|
|
|
|
execv(shell, np.b);
|
|
err(1, "%s", shell);
|
|
}
|
|
}
|
|
|
|
static void
|
|
export_pam_environment(void)
|
|
{
|
|
char **pp;
|
|
char *p;
|
|
|
|
for (pp = environ_pam; *pp != NULL; pp++) {
|
|
if (ok_to_export(*pp)) {
|
|
p = strchr(*pp, '=');
|
|
*p = '\0';
|
|
setenv(*pp, p + 1, 1);
|
|
}
|
|
free(*pp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Sanity checks on PAM environmental variables:
|
|
* - Make sure there is an '=' in the string.
|
|
* - Make sure the string doesn't run on too long.
|
|
* - Do not export certain variables. This list was taken from the
|
|
* Solaris pam_putenv(3) man page.
|
|
* Note that if the user is chrooted, PAM may have a better idea than we
|
|
* do of where her home directory is.
|
|
*/
|
|
static int
|
|
ok_to_export(const char *s)
|
|
{
|
|
static const char *noexport[] = {
|
|
"SHELL", /* "HOME", */ "LOGNAME", "MAIL", "CDPATH",
|
|
"IFS", "PATH", NULL
|
|
};
|
|
const char **pp;
|
|
size_t n;
|
|
|
|
if (strlen(s) > 1024 || strchr(s, '=') == NULL)
|
|
return 0;
|
|
if (strncmp(s, "LD_", 3) == 0)
|
|
return 0;
|
|
for (pp = noexport; *pp != NULL; pp++) {
|
|
n = strlen(*pp);
|
|
if (s[n] == '=' && strncmp(s, *pp, n) == 0)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
|
|
fprintf(stderr, "usage: su [-] [-flms] [-c class] [login [args]]\n");
|
|
exit(1);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static int
|
|
chshell(const char *sh)
|
|
{
|
|
int r;
|
|
char *cp;
|
|
|
|
r = 0;
|
|
setusershell();
|
|
while ((cp = getusershell()) != NULL && !r)
|
|
r = (strcmp(cp, sh) == 0);
|
|
endusershell();
|
|
return r;
|
|
}
|
|
|
|
static char *
|
|
ontty(void)
|
|
{
|
|
char *p;
|
|
static char buf[MAXPATHLEN + 4];
|
|
|
|
buf[0] = 0;
|
|
p = ttyname(STDERR_FILENO);
|
|
if (p)
|
|
snprintf(buf, sizeof(buf), " on %s", p);
|
|
return buf;
|
|
}
|