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|
/*-
* Copyright 1998 Juniper Networks, Inc.
* All rights reserved.
* Copyright (c) 2002 Networks Associates Technologies, Inc.
* All rights reserved.
*
* Portions of this software was 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.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef YP
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#include <rpcsvc/yppasswd.h>
#endif
#include <login_cap.h>
#include <netdb.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <pw_copy.h>
#include <pw_util.h>
#ifdef YP
#include <pw_yp.h>
#include "yppasswd_private.h"
#endif
#define PAM_SM_AUTH
#define PAM_SM_ACCOUNT
#define PAM_SM_SESSION
#define PAM_SM_PASSWORD
#include <security/pam_modules.h>
#include "pam_mod_misc.h"
#define USER_PROMPT "Username: "
#define PASSWORD_PROMPT "Password:"
#define PASSWORD_PROMPT_EXPIRED "\nPassword expired\nOld Password:"
#define NEW_PASSWORD_PROMPT_1 "New Password:"
#define NEW_PASSWORD_PROMPT_2 "New Password (again):"
#define PASSWORD_HASH "md5"
#define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
#define MAX_TRIES 3
static char password_prompt_def[] = PASSWORD_PROMPT;
static char password_hash[] = PASSWORD_HASH;
enum {
PAM_OPT_AUTH_AS_SELF = PAM_OPT_STD_MAX,
PAM_OPT_NULLOK,
PAM_OPT_LOCAL_PASS,
PAM_OPT_NIS_PASS
};
static struct opttab other_options[] = {
{ "auth_as_self", PAM_OPT_AUTH_AS_SELF },
{ "nullok", PAM_OPT_NULLOK },
{ "local_pass", PAM_OPT_LOCAL_PASS },
{ "nis_pass", PAM_OPT_NIS_PASS },
{ NULL, 0 }
};
#ifdef YP
int pam_use_yp = 0;
int yp_errno = YP_TRUE;
#endif
char *tempname = NULL;
static int local_passwd(const char *user, const char *pass);
#ifdef YP
static int yp_passwd(const char *user, const char *pass);
#endif
/*
* authentication management
*/
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, int argc, const char **argv)
{
login_cap_t *lc;
struct options options;
struct passwd *pwd;
int retval;
const char *pass, *user;
char *encrypted, *password_prompt;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
if (pam_test_option(&options, PAM_OPT_AUTH_AS_SELF, NULL))
pwd = getpwnam(getlogin());
else {
retval = pam_get_user(pamh, &user, NULL);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
pwd = getpwnam(user);
}
PAM_LOG("Got user: %s", user);
lc = login_getclass(NULL);
password_prompt = login_getcapstr(lc, "passwd_prompt",
password_prompt_def, password_prompt_def);
login_close(lc);
lc = NULL;
if (pwd != NULL) {
PAM_LOG("Doing real authentication");
if (pwd->pw_passwd[0] == '\0'
&& pam_test_option(&options, PAM_OPT_NULLOK, NULL)) {
/*
* No password case. XXX Are we giving too much away
* by not prompting for a password?
*/
PAM_LOG("No password, and null password OK");
PAM_RETURN(PAM_SUCCESS);
}
else {
retval = pam_get_pass(pamh, &pass, password_prompt,
&options);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
PAM_LOG("Got password");
}
encrypted = crypt(pass, pwd->pw_passwd);
if (pass[0] == '\0' && pwd->pw_passwd[0] != '\0')
encrypted = strdup(":");
PAM_LOG("Encrypted password 1 is: %s", encrypted);
PAM_LOG("Encrypted password 2 is: %s", pwd->pw_passwd);
retval = strcmp(encrypted, pwd->pw_passwd) == 0 ?
PAM_SUCCESS : PAM_AUTH_ERR;
}
else {
PAM_LOG("Doing dummy authentication");
/*
* User unknown.
* Encrypt a dummy password so as to not give away too much.
*/
retval = pam_get_pass(pamh, &pass, password_prompt,
&options);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
PAM_LOG("Got password");
crypt(pass, "xx");
retval = PAM_AUTH_ERR;
}
/*
* The PAM infrastructure will obliterate the cleartext
* password before returning to the application.
*/
if (retval != PAM_SUCCESS)
PAM_VERBOSE_ERROR("UNIX authentication refused");
PAM_RETURN(retval);
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
{
struct options options;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_SUCCESS);
}
/*
* account management
*/
PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused, int argc, const char **argv)
{
struct addrinfo hints, *res;
struct options options;
struct passwd *pwd;
struct timeval tp;
login_cap_t *lc;
time_t warntime;
int retval;
const char *rhost, *tty, *user;
char rhostip[MAXHOSTNAMELEN];
char buf[128];
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
retval = pam_get_item(pamh, PAM_USER, (const void **)&user);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
if (user == NULL || (pwd = getpwnam(user)) == NULL)
PAM_RETURN(PAM_SERVICE_ERR);
PAM_LOG("Got user: %s", user);
retval = pam_get_item(pamh, PAM_RHOST, (const void **)&rhost);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
retval = pam_get_item(pamh, PAM_TTY, (const void **)&tty);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
if (*pwd->pw_passwd == '\0' &&
(flags & PAM_DISALLOW_NULL_AUTHTOK) != 0)
return (PAM_NEW_AUTHTOK_REQD);
lc = login_getpwclass(pwd);
if (lc == NULL) {
PAM_LOG("Unable to get login class for user %s", user);
return (PAM_SERVICE_ERR);
}
PAM_LOG("Got login_cap");
if (pwd->pw_change || pwd->pw_expire)
gettimeofday(&tp, NULL);
/*
* Check pw_expire before pw_change - no point in letting the
* user change the password on an expired account.
*/
if (pwd->pw_expire) {
warntime = login_getcaptime(lc, "warnexpire",
DEFAULT_WARN, DEFAULT_WARN);
if (tp.tv_sec >= pwd->pw_expire) {
login_close(lc);
PAM_RETURN(PAM_ACCT_EXPIRED);
} else if (pwd->pw_expire - tp.tv_sec < warntime &&
(flags & PAM_SILENT) == 0) {
snprintf(buf, sizeof(buf),
"Warning: your account expires on %s",
ctime(&pwd->pw_expire));
pam_prompt(pamh, PAM_ERROR_MSG, buf, NULL);
}
}
retval = PAM_SUCCESS;
if (pwd->pw_change) {
warntime = login_getcaptime(lc, "warnpassword",
DEFAULT_WARN, DEFAULT_WARN);
if (tp.tv_sec >= pwd->pw_change) {
retval = PAM_NEW_AUTHTOK_REQD;
} else if (pwd->pw_change - tp.tv_sec < warntime &&
(flags & PAM_SILENT) == 0) {
snprintf(buf, sizeof(buf),
"Warning: your password expires on %s",
ctime(&pwd->pw_change));
pam_prompt(pamh, PAM_ERROR_MSG, buf, NULL);
}
}
/*
* From here on, we must leave retval untouched (unless we
* know we're going to fail), because we need to remember
* whether we're supposed to return PAM_SUCCESS or
* PAM_NEW_AUTHTOK_REQD.
*/
if (rhost) {
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
if (getaddrinfo(rhost, NULL, &hints, &res) == 0) {
getnameinfo(res->ai_addr, res->ai_addrlen,
rhostip, sizeof(rhostip), NULL, 0,
NI_NUMERICHOST|NI_WITHSCOPEID);
}
if (res != NULL)
freeaddrinfo(res);
}
/*
* Check host / tty / time-of-day restrictions
*/
if (!auth_hostok(lc, rhost, rhostip) ||
!auth_ttyok(lc, tty) ||
!auth_timeok(lc, time(NULL)))
retval = PAM_AUTH_ERR;
login_close(lc);
PAM_RETURN(retval);
}
/*
* session management
*
* logging only
*/
PAM_EXTERN int
pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
{
struct options options;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_SUCCESS);
}
PAM_EXTERN int
pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc, const char **argv)
{
struct options options;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_SUCCESS);
}
/*
* password management
*
* standard Unix and NIS password changing
*/
PAM_EXTERN int
pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
struct options options;
struct passwd *pwd;
int retval, retry, res, got;
const char *user, *pass;
char *new_pass, *new_pass_, *encrypted;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
if (pam_test_option(&options, PAM_OPT_AUTH_AS_SELF, NULL))
pwd = getpwnam(getlogin());
else {
retval = pam_get_user(pamh, &user, NULL);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
pwd = getpwnam(user);
}
PAM_LOG("Got user: %s", user);
if (flags & PAM_PRELIM_CHECK) {
PAM_LOG("PRELIM round; checking user password");
if (pwd->pw_passwd[0] == '\0'
&& pam_test_option(&options, PAM_OPT_NULLOK, NULL)) {
/*
* No password case. XXX Are we giving too much away
* by not prompting for a password?
*/
PAM_LOG("No password, and null password OK");
PAM_RETURN(PAM_SUCCESS);
}
else {
retval = pam_get_pass(pamh, &pass,
PASSWORD_PROMPT_EXPIRED, &options);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
PAM_LOG("Got password: %s", pass);
}
encrypted = crypt(pass, pwd->pw_passwd);
if (pass[0] == '\0' && pwd->pw_passwd[0] != '\0')
encrypted = strdup(":");
PAM_LOG("Encrypted password 1 is: %s", encrypted);
PAM_LOG("Encrypted password 2 is: %s", pwd->pw_passwd);
if (strcmp(encrypted, pwd->pw_passwd) != 0)
PAM_RETURN(PAM_AUTH_ERR);
retval = pam_set_item(pamh, PAM_OLDAUTHTOK, (const void *)pass);
pass = NULL;
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
PAM_LOG("Stashed old password");
retval = pam_set_item(pamh, PAM_AUTHTOK, (const void *)pass);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
PAM_LOG("Voided old password");
PAM_RETURN(PAM_SUCCESS);
}
else if (flags & PAM_UPDATE_AUTHTOK) {
PAM_LOG("UPDATE round; checking user password");
retval = pam_get_item(pamh, PAM_OLDAUTHTOK,
(const void **)&pass);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
PAM_LOG("Got old password: %s", pass);
got = 0;
retry = 0;
while (retry++ < MAX_TRIES) {
new_pass = NULL;
retval = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF,
NEW_PASSWORD_PROMPT_1, &new_pass);
if (new_pass == NULL)
new_pass = strdup("");
if (retval == PAM_SUCCESS) {
new_pass_ = NULL;
retval = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF,
NEW_PASSWORD_PROMPT_2, &new_pass_);
if (new_pass_ == NULL)
new_pass_ = strdup("");
if (retval == PAM_SUCCESS) {
if (strcmp(new_pass, new_pass_) == 0) {
got = 1;
break;
}
else
PAM_VERBOSE_ERROR("Password mismatch");
}
}
}
if (!got) {
PAM_VERBOSE_ERROR("Unable to get valid password");
PAM_RETURN(PAM_PERM_DENIED);
}
PAM_LOG("Got new password: %s", new_pass);
#ifdef YP
/* If NIS is set in the passwd database, use it */
res = use_yp(user, 0, 0);
if (res == USER_YP_ONLY) {
if (!pam_test_option(&options, PAM_OPT_LOCAL_PASS,
NULL))
retval = yp_passwd(user, new_pass);
else {
/* Reject 'local' flag if NIS is on and the user
* is not local
*/
retval = PAM_PERM_DENIED;
PAM_LOG("Unknown local user: %s", user);
}
}
else if (res == USER_LOCAL_ONLY) {
if (!pam_test_option(&options, PAM_OPT_NIS_PASS, NULL))
retval = local_passwd(user, new_pass);
else {
/* Reject 'nis' flag if user is only local */
retval = PAM_PERM_DENIED;
PAM_LOG("Unknown NIS user: %s", user);
}
}
else if (res == USER_YP_AND_LOCAL) {
if (pam_test_option(&options, PAM_OPT_NIS_PASS, NULL))
retval = yp_passwd(user, new_pass);
else
retval = local_passwd(user, new_pass);
}
else
retval = PAM_ABORT; /* Bad juju */
#else
retval = local_passwd(user, new_pass);
#endif
/* XXX wipe the mem as well */
pass = NULL;
new_pass = NULL;
}
else {
/* Very bad juju */
retval = PAM_ABORT;
PAM_LOG("Illegal 'flags'");
}
PAM_RETURN(retval);
}
/* Mostly stolen from passwd(1)'s local_passwd.c - markm */
static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
static void
to64(char *s, long v, int n)
{
while (--n >= 0) {
*s++ = itoa64[v&0x3f];
v >>= 6;
}
}
static int
local_passwd(const char *user, const char *pass)
{
login_cap_t * lc;
struct passwd *pwd;
struct timeval tv;
int pfd, tfd;
char *crypt_type, salt[32];
pwd = getpwnam(user);
if (pwd == NULL)
return(PAM_ABORT); /* Really bad things */
#ifdef YP
pwd = (struct passwd *)&local_password;
#endif
pw_init();
pwd->pw_change = 0;
lc = login_getclass(NULL);
crypt_type = login_getcapstr(lc, "passwd_format",
password_hash, password_hash);
if (login_setcryptfmt(lc, crypt_type, NULL) == NULL)
syslog(LOG_ERR, "cannot set password cipher");
login_close(lc);
/* Salt suitable for anything */
gettimeofday(&tv, 0);
to64(&salt[0], (tv.tv_sec ^ random()) * tv.tv_usec, 3);
to64(&salt[3], (getpid() ^ random()) * tv.tv_usec, 2);
to64(&salt[5], (getppid() ^ random()) * tv.tv_usec, 3);
to64(&salt[8], (getuid() ^ random()) * tv.tv_usec, 5);
to64(&salt[13], (getgid() ^ random()) * tv.tv_usec, 5);
to64(&salt[17], random() * tv.tv_usec, 5);
to64(&salt[22], random() * tv.tv_usec, 5);
salt[27] = '\0';
pwd->pw_passwd = crypt(pass, salt);
pfd = pw_lock();
tfd = pw_tmp();
pw_copy(pfd, tfd, pwd);
if (!pw_mkdb(user))
pw_error((char *)NULL, 0, 1);
return PAM_SUCCESS;
}
#ifdef YP
/* Stolen from src/usr.bin/passwd/yp_passwd.c, carrying copyrights of:
* Copyright (c) 1992/3 Theo de Raadt <deraadt@fsa.ca>
* Copyright (c) 1994 Olaf Kirch <okir@monad.swb.de>
* Copyright (c) 1995 Bill Paul <wpaul@ctr.columbia.edu>
*/
int
yp_passwd(const char *user, const char *pass)
{
struct master_yppasswd master_yppasswd;
struct passwd *pwd;
struct rpc_err err;
struct timeval tv;
struct yppasswd yppasswd;
CLIENT *clnt;
login_cap_t *lc;
int *status;
uid_t uid;
char *master, sockname[] = YP_SOCKNAME, salt[32];
_use_yp = 1;
uid = getuid();
master = get_yp_master(1);
if (master == NULL)
return PAM_ABORT; /* Major disaster */
/*
* It is presumed that by the time we get here, use_yp()
* has been called and that we have verified that the user
* actually exists. This being the case, the yp_password
* stucture has already been filled in for us.
*/
/* Use the correct password */
pwd = (struct passwd *)&yp_password;
pwd->pw_change = 0;
/* Initialize password information */
if (suser_override) {
master_yppasswd.newpw.pw_passwd = strdup(pwd->pw_passwd);
master_yppasswd.newpw.pw_name = strdup(pwd->pw_name);
master_yppasswd.newpw.pw_uid = pwd->pw_uid;
master_yppasswd.newpw.pw_gid = pwd->pw_gid;
master_yppasswd.newpw.pw_expire = pwd->pw_expire;
master_yppasswd.newpw.pw_change = pwd->pw_change;
master_yppasswd.newpw.pw_fields = pwd->pw_fields;
master_yppasswd.newpw.pw_gecos = strdup(pwd->pw_gecos);
master_yppasswd.newpw.pw_dir = strdup(pwd->pw_dir);
master_yppasswd.newpw.pw_shell = strdup(pwd->pw_shell);
master_yppasswd.newpw.pw_class = pwd->pw_class != NULL ?
strdup(pwd->pw_class) : strdup("");
master_yppasswd.oldpass = strdup("");
master_yppasswd.domain = yp_domain;
} else {
yppasswd.newpw.pw_passwd = strdup(pwd->pw_passwd);
yppasswd.newpw.pw_name = strdup(pwd->pw_name);
yppasswd.newpw.pw_uid = pwd->pw_uid;
yppasswd.newpw.pw_gid = pwd->pw_gid;
yppasswd.newpw.pw_gecos = strdup(pwd->pw_gecos);
yppasswd.newpw.pw_dir = strdup(pwd->pw_dir);
yppasswd.newpw.pw_shell = strdup(pwd->pw_shell);
yppasswd.oldpass = strdup("");
}
if (login_setcryptfmt(lc, "md5", NULL) == NULL)
syslog(LOG_ERR, "cannot set password cipher");
login_close(lc);
/* Salt suitable for anything */
srandomdev();
gettimeofday(&tv, 0);
to64(&salt[0], random(), 3);
to64(&salt[3], tv.tv_usec, 3);
to64(&salt[6], tv.tv_sec, 2);
to64(&salt[8], random(), 5);
to64(&salt[13], random(), 5);
to64(&salt[17], random(), 5);
to64(&salt[22], random(), 5);
salt[27] = '\0';
if (suser_override)
master_yppasswd.newpw.pw_passwd = crypt(pass, salt);
else
yppasswd.newpw.pw_passwd = crypt(pass, salt);
if (suser_override) {
if ((clnt = clnt_create(sockname, MASTER_YPPASSWDPROG,
MASTER_YPPASSWDVERS, "unix")) == NULL) {
syslog(LOG_ERR,
"Cannot contact rpc.yppasswdd on host %s: %s",
master, clnt_spcreateerror(""));
return PAM_ABORT;
}
}
else {
if ((clnt = clnt_create(master, YPPASSWDPROG,
YPPASSWDVERS, "udp")) == NULL) {
syslog(LOG_ERR,
"Cannot contact rpc.yppasswdd on host %s: %s",
master, clnt_spcreateerror(""));
return PAM_ABORT;
}
}
/*
* The yppasswd.x file said `unix authentication required',
* so I added it. This is the only reason it is in here.
* My yppasswdd doesn't use it, but maybe some others out there
* do. --okir
*/
clnt->cl_auth = authunix_create_default();
if (suser_override)
status = yppasswdproc_update_master_1(&master_yppasswd, clnt);
else
status = yppasswdproc_update_1(&yppasswd, clnt);
clnt_geterr(clnt, &err);
auth_destroy(clnt->cl_auth);
clnt_destroy(clnt);
if (err.re_status != RPC_SUCCESS || status == NULL || *status)
return PAM_ABORT;
return (err.re_status || status == NULL || *status)
? PAM_ABORT : PAM_SUCCESS;
}
#endif /* YP */
PAM_MODULE_ENTRY("pam_unix");
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