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openldap/servers/slapd/overlays/ppolicy.c

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/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2004-2005 The OpenLDAP Foundation.
* Portions Copyright 2004 Howard Chu, Symas Corporation.
* Portions Copyright 2004 Hewlett-Packard Company.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* ACKNOWLEDGEMENTS:
* This work was developed by Howard Chu for inclusion in
* OpenLDAP Software, based on prior work by Neil Dunbar (HP).
* This work was sponsored by the Hewlett-Packard Company.
*/
#include "portable.h"
/* This file implements "Password Policy for LDAP Directories",
* based on draft behera-ldap-password-policy-07
*/
#ifdef SLAPD_OVER_PPOLICY
#if SLAPD_OVER_PPOLICY == SLAPD_MOD_DYNAMIC
#define SLAPD_IMPORT
#endif
#include <ldap.h>
#include "lutil.h"
#include "slap.h"
#if SLAPD_MODULES
#include <ltdl.h>
#endif
#include <ac/errno.h>
#include <ac/time.h>
#include <ac/string.h>
#include <ac/ctype.h>
#ifndef MODULE_NAME_SZ
#define MODULE_NAME_SZ 256
#endif
/* Per-instance configuration information */
typedef struct pp_info {
struct berval def_policy; /* DN of default policy subentry */
int use_lockout; /* send AccountLocked result? */
int hash_passwords; /* transparently hash cleartext pwds */
} pp_info;
/* Our per-connection info - note, it is not per-instance, it is
* used by all instances
*/
typedef struct pw_conn {
int restrict; /* TRUE if connection is restricted */
} pw_conn;
static pw_conn *pwcons;
static int ppolicy_cid;
typedef struct pass_policy {
AttributeDescription *ad; /* attribute to which the policy applies */
int pwdMinAge; /* minimum time (seconds) until passwd can change */
int pwdMaxAge; /* time in seconds until pwd will expire after change */
int pwdInHistory; /* number of previous passwords kept */
int pwdCheckQuality; /* 0 = don't check quality, 1 = check if possible,
2 = check mandatory; fail if not possible */
int pwdMinLength; /* minimum number of chars in password */
int pwdExpireWarning; /* number of seconds that warning controls are
sent before a password expires */
int pwdGraceLoginLimit; /* number of times you can log in with an
expired password */
int pwdLockout; /* 0 = do not lockout passwords, 1 = lock them out */
int pwdLockoutDuration; /* time in seconds a password is locked out for */
int pwdMaxFailure; /* number of failed binds allowed before lockout */
int pwdFailureCountInterval; /* number of seconds before failure
counts are zeroed */
int pwdMustChange; /* 0 = users can use admin set password
1 = users must change password after admin set */
int pwdAllowUserChange; /* 0 = users cannot change their passwords
1 = users can change them */
int pwdSafeModify; /* 0 = old password doesn't need to come
with password change request
1 = password change must supply existing pwd */
char pwdCheckModule[MODULE_NAME_SZ]; /* name of module to dynamically
load to check password */
} PassPolicy;
typedef struct pw_hist {
time_t t; /* timestamp of history entry */
struct berval pw; /* old password hash */
struct berval bv; /* text of entire entry */
struct pw_hist *next;
} pw_hist;
/* Operational attributes */
static AttributeDescription *ad_pwdChangedTime, *ad_pwdAccountLockedTime,
*ad_pwdExpirationWarned, *ad_pwdFailureTime, *ad_pwdHistory,
*ad_pwdGraceUseTime, *ad_pwdReset, *ad_pwdPolicySubentry;
static struct schema_info {
char *def;
AttributeDescription **ad;
} pwd_OpSchema[] = {
{ "( 1.3.6.1.4.1.42.2.27.8.1.16 "
"NAME ( 'pwdChangedTime' ) "
"DESC 'The time the password was last changed' "
"EQUALITY generalizedTimeMatch "
"ORDERING generalizedTimeOrderingMatch "
"SYNTAX 1.3.6.1.4.1.1466.115.121.1.24 "
"SINGLE-VALUE USAGE directoryOperation )",
&ad_pwdChangedTime },
{ "( 1.3.6.1.4.1.42.2.27.8.1.17 "
"NAME ( 'pwdAccountLockedTime' ) "
"DESC 'The time an user account was locked' "
"EQUALITY generalizedTimeMatch "
"ORDERING generalizedTimeOrderingMatch "
"SYNTAX 1.3.6.1.4.1.1466.115.121.1.24 "
"SINGLE-VALUE USAGE directoryOperation )",
&ad_pwdAccountLockedTime },
{ "( 1.3.6.1.4.1.42.2.27.8.1.18 "
"NAME ( 'pwdExpirationWarned' ) "
"DESC 'The time the user was first warned about the coming expiration of the password' "
"EQUALITY generalizedTimeMatch "
"ORDERING generalizedTimeOrderingMatch "
"SYNTAX 1.3.6.1.4.1.1466.115.121.1.24 "
"SINGLE-VALUE USAGE directoryOperation )",
&ad_pwdExpirationWarned },
{ "( 1.3.6.1.4.1.42.2.27.8.1.19 "
"NAME ( 'pwdFailureTime' ) "
"DESC 'The timestamps of the last consecutive authentication failures' "
"EQUALITY generalizedTimeMatch "
"ORDERING generalizedTimeOrderingMatch "
"SYNTAX 1.3.6.1.4.1.1466.115.121.1.24 "
"USAGE directoryOperation )",
&ad_pwdFailureTime },
{ "( 1.3.6.1.4.1.42.2.27.8.1.20 "
"NAME ( 'pwdHistory' ) "
"DESC 'The history of users passwords' "
"EQUALITY octetStringMatch "
"SYNTAX 1.3.6.1.4.1.1466.115.121.1.40 "
"USAGE directoryOperation )",
&ad_pwdHistory },
{ "( 1.3.6.1.4.1.42.2.27.8.1.21 "
"NAME ( 'pwdGraceUseTime' ) "
"DESC 'The timestamps of the grace login once the password has expired' "
"EQUALITY generalizedTimeMatch "
"SYNTAX 1.3.6.1.4.1.1466.115.121.1.24 "
"USAGE directoryOperation )",
&ad_pwdGraceUseTime },
{ "( 1.3.6.1.4.1.42.2.27.8.1.22 "
"NAME ( 'pwdReset' ) "
"DESC 'The indication that the password has been reset' "
"EQUALITY booleanMatch "
"SYNTAX 1.3.6.1.4.1.1466.115.121.1.7 "
"SINGLE-VALUE USAGE directoryOperation )",
&ad_pwdReset },
{ "( 1.3.6.1.4.1.42.2.27.8.1.23 "
"NAME ( 'pwdPolicySubentry' ) "
"DESC 'The pwdPolicy subentry in effect for this object' "
"EQUALITY distinguishedNameMatch "
"SYNTAX 1.3.6.1.4.1.1466.115.121.1.12 "
"SINGLE-VALUE USAGE directoryOperation )",
&ad_pwdPolicySubentry },
{ NULL, NULL }
};
/* User attributes */
static AttributeDescription *ad_pwdMinAge, *ad_pwdMaxAge, *ad_pwdInHistory,
*ad_pwdCheckQuality, *ad_pwdMinLength, *ad_pwdMaxFailure,
*ad_pwdGraceLoginLimit, *ad_pwdExpireWarning, *ad_pwdLockoutDuration,
*ad_pwdFailureCountInterval, *ad_pwdCheckModule, *ad_pwdLockout,
*ad_pwdMustChange, *ad_pwdAllowUserChange, *ad_pwdSafeModify,
*ad_pwdAttribute;
#define TAB(name) { #name, &ad_##name }
static struct schema_info pwd_UsSchema[] = {
TAB(pwdAttribute),
TAB(pwdMinAge),
TAB(pwdMaxAge),
TAB(pwdInHistory),
TAB(pwdCheckQuality),
TAB(pwdMinLength),
TAB(pwdMaxFailure),
TAB(pwdGraceLoginLimit),
TAB(pwdExpireWarning),
TAB(pwdLockout),
TAB(pwdLockoutDuration),
TAB(pwdFailureCountInterval),
TAB(pwdCheckModule),
TAB(pwdMustChange),
TAB(pwdAllowUserChange),
TAB(pwdSafeModify),
{ NULL, NULL }
};
static ldap_pvt_thread_mutex_t chk_syntax_mutex;
static time_t
parse_time( char *atm )
{
struct lutil_tm tm;
struct lutil_timet tt;
time_t ret = (time_t)-1;
if ( lutil_parsetime( atm, &tm ) == 0) {
lutil_tm2time( &tm, &tt );
ret = tt.tt_sec;
}
return ret;
}
static int
account_locked( Operation *op, Entry *e,
PassPolicy *pp, Modifications **mod )
{
Attribute *la;
int rc;
Entry *de;
assert(mod);
if ( (la = attr_find( e->e_attrs, ad_pwdAccountLockedTime )) != NULL ) {
BerVarray vals = la->a_nvals;
/*
* there is a lockout stamp - we now need to know if it's
* a valid one.
*/
if (vals[0].bv_val != NULL) {
time_t then, now;
struct berval bv;
Modifications *m;
if ((then = parse_time( vals[0].bv_val )) == (time_t)0)
return 1;
now = slap_get_time();
if (now < then + pp->pwdLockoutDuration)
return 1;
m = ch_calloc( sizeof(Modifications), 1 );
m->sml_op = LDAP_MOD_DELETE;
m->sml_type = ad_pwdAccountLockedTime->ad_cname;
m->sml_desc = ad_pwdAccountLockedTime;
m->sml_next = *mod;
*mod = m;
}
}
return 0;
}
#define PPOLICY_WARNING 0xa0L
#define PPOLICY_ERROR 0xa1L
#define PPOLICY_EXPIRE 0xa0L
#define PPOLICY_GRACE 0xa1L
static LDAPControl *
create_passcontrol( int exptime, int grace, LDAPPasswordPolicyError err )
{
char berbuf[LBER_ELEMENT_SIZEOF], bb2[LBER_ELEMENT_SIZEOF];
BerElement *ber = (BerElement *)berbuf, *b2 = (BerElement *)bb2;
LDAPControl *c;
struct berval bv;
if ((c = ch_calloc( sizeof( LDAPControl ), 1 )) == NULL) return NULL;
c->ldctl_oid = LDAP_CONTROL_PASSWORDPOLICYRESPONSE;
c->ldctl_iscritical = 0;
c->ldctl_value.bv_val = NULL;
c->ldctl_value.bv_len = 0;
ber_init2( ber, NULL, LBER_USE_DER );
ber_printf(ber, "{" /*}*/ );
if (exptime >= 0) {
ber_init2( b2, NULL, LBER_USE_DER );
ber_printf( b2, "ti", PPOLICY_EXPIRE, exptime );
ber_flatten2( b2, &bv, 1 );
ber_printf( ber, "tO", PPOLICY_WARNING, &bv );
ch_free( bv.bv_val );
} else if (grace > 0) {
ber_init2( b2, NULL, LBER_USE_DER );
ber_printf( b2, "ti", PPOLICY_GRACE, grace );
ber_flatten2( b2, &bv, 1 );
ber_printf( ber, "tO", PPOLICY_WARNING, &bv );
ch_free( bv.bv_val );
}
if (err != PP_noError ) {
ber_printf( ber, "te", PPOLICY_ERROR, err );
}
ber_printf( ber, /*{*/ "N}" );
if (ber_flatten2( ber, &(c->ldctl_value), 1 ) == LBER_DEFAULT) {
ch_free(c);
(void)ber_free_buf(ber);
return NULL;
}
(void)ber_free_buf(ber);
return c;
}
static void
ppolicy_get( Operation *op, Entry *e, PassPolicy *pp )
{
slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
pp_info *pi = on->on_bi.bi_private;
Attribute *a;
BerVarray vals;
int i, rc, nent;
Entry *pe = NULL;
AttributeDescription *oca = slap_schema.si_ad_objectClass;
const char *text;
AttributeDescription *ad;
struct berval bv;
memset( pp, 0, sizeof(PassPolicy) );
/* Users can change their own password by default */
pp->pwdAllowUserChange = 1;
if ((a = attr_find( e->e_attrs, ad_pwdPolicySubentry )) == NULL) {
/*
* entry has no password policy assigned - use default
*/
vals = &pi->def_policy;
if ( !vals->bv_val )
goto defaultpol;
} else {
vals = a->a_nvals;
if (vals[0].bv_val == NULL) {
Debug( LDAP_DEBUG_ANY,
"ppolicy_get: NULL value for policySubEntry\n", 0, 0, 0 );
goto defaultpol;
}
}
op->o_bd->bd_info = (BackendInfo *)on->on_info;
rc = be_entry_get_rw( op, vals, NULL, NULL, 0, &pe );
op->o_bd->bd_info = (BackendInfo *)on;
if ( rc ) goto defaultpol;
#if 0 /* Only worry about userPassword for now */
if ((a = attr_find( pe->e_attrs, ad_pwdAttribute )))
slap_bv2ad( &a->a_vals[0], &pp->ad, &text );
#else
pp->ad = slap_schema.si_ad_userPassword;
#endif
if ((a = attr_find( pe->e_attrs, ad_pwdMinAge )))
pp->pwdMinAge = atoi(a->a_vals[0].bv_val );
if ((a = attr_find( pe->e_attrs, ad_pwdMaxAge )))
pp->pwdMaxAge = atoi(a->a_vals[0].bv_val );
if ((a = attr_find( pe->e_attrs, ad_pwdInHistory )))
pp->pwdInHistory = atoi(a->a_vals[0].bv_val );
if ((a = attr_find( pe->e_attrs, ad_pwdCheckQuality )))
pp->pwdCheckQuality = atoi(a->a_vals[0].bv_val );
if ((a = attr_find( pe->e_attrs, ad_pwdMinLength )))
pp->pwdMinLength = atoi(a->a_vals[0].bv_val );
if ((a = attr_find( pe->e_attrs, ad_pwdMaxFailure )))
pp->pwdMaxFailure = atoi(a->a_vals[0].bv_val );
if ((a = attr_find( pe->e_attrs, ad_pwdGraceLoginLimit )))
pp->pwdGraceLoginLimit = atoi(a->a_vals[0].bv_val );
if ((a = attr_find( pe->e_attrs, ad_pwdExpireWarning )))
pp->pwdExpireWarning = atoi(a->a_vals[0].bv_val );
if ((a = attr_find( pe->e_attrs, ad_pwdFailureCountInterval )))
pp->pwdFailureCountInterval = atoi(a->a_vals[0].bv_val );
if ((a = attr_find( pe->e_attrs, ad_pwdLockoutDuration )))
pp->pwdLockoutDuration = atoi(a->a_vals[0].bv_val );
if ((a = attr_find( pe->e_attrs, ad_pwdCheckModule ))) {
strncpy(pp->pwdCheckModule, a->a_vals[0].bv_val,
sizeof(pp->pwdCheckModule));
pp->pwdCheckModule[sizeof(pp->pwdCheckModule)-1] = '\0';
}
if ((a = attr_find( pe->e_attrs, ad_pwdLockout )))
pp->pwdLockout = !strcmp( a->a_nvals[0].bv_val, "TRUE" );
if ((a = attr_find( pe->e_attrs, ad_pwdMustChange )))
pp->pwdMustChange = !strcmp( a->a_nvals[0].bv_val, "TRUE" );
if ((a = attr_find( pe->e_attrs, ad_pwdAllowUserChange )))
pp->pwdAllowUserChange = !strcmp( a->a_nvals[0].bv_val, "TRUE" );
if ((a = attr_find( pe->e_attrs, ad_pwdSafeModify )))
pp->pwdSafeModify = !strcmp( a->a_nvals[0].bv_val, "TRUE" );
op->o_bd->bd_info = (BackendInfo *)on->on_info;
be_entry_release_r( op, pe );
op->o_bd->bd_info = (BackendInfo *)on;
return;
defaultpol:
Debug( LDAP_DEBUG_ANY,
"ppolicy_get: using default policy\n", 0, 0, 0 );
return;
}
static int
password_scheme( struct berval *cred, struct berval *sch )
{
int e;
assert( cred != NULL );
if (sch) {
sch->bv_val = NULL;
sch->bv_len = 0;
}
if ((cred->bv_len == 0) || (cred->bv_val == NULL) ||
(cred->bv_val[0] != '{')) return LDAP_OTHER;
for(e = 1; cred->bv_val[e] && cred->bv_val[e] != '}'; e++);
if (cred->bv_val[e]) {
char *sc = ch_calloc( sizeof(char), e + 2);
sc[e + 1] = '\0'; /* terminate string */
strncpy( sc, cred->bv_val, e + 1);
e = lutil_passwd_scheme( sc );
free( sc );
if (e && sch) {
sch->bv_val = cred->bv_val;
sch->bv_len = e;
return LDAP_SUCCESS;
}
}
return LDAP_OTHER;
}
static int
check_password_quality( struct berval *cred, PassPolicy *pp, LDAPPasswordPolicyError *err, Entry *e )
{
int rc = LDAP_SUCCESS, ok = LDAP_SUCCESS;
char *ptr = cred->bv_val;
char *modpath;
struct berval sch;
assert( cred != NULL );
assert( pp != NULL );
if ((cred->bv_len == 0) || (pp->pwdMinLength > cred->bv_len)) {
rc = LDAP_CONSTRAINT_VIOLATION;
if ( err ) *err = PP_passwordTooShort;
return rc;
}
/*
* We need to know if the password is already hashed - if so
* what scheme is it. The reason being that the "hash" of
* {cleartext} still allows us to check the password.
*/
rc = password_scheme( cred, &sch );
if (rc == LDAP_SUCCESS) {
if ((sch.bv_val) && (strncasecmp( sch.bv_val, "{cleartext}",
sch.bv_len ) == 0)) {
/*
* We can check the cleartext "hash"
*/
ptr = cred->bv_val + sch.bv_len;
} else {
/* everything else, we can't check */
if (pp->pwdCheckQuality == 2) {
rc = LDAP_CONSTRAINT_VIOLATION;
if (err) *err = PP_insufficientPasswordQuality;
return rc;
}
/*
* We can't check the syntax of the password, but it's not
* mandatory (according to the policy), so we return success.
*/
return LDAP_SUCCESS;
}
}
rc = LDAP_SUCCESS;
if (pp->pwdCheckModule[0]) {
#if SLAPD_MODULES
lt_dlhandle mod;
const char *err;
if ((mod = lt_dlopen( pp->pwdCheckModule )) == NULL) {
err = lt_dlerror();
Debug(LDAP_DEBUG_ANY,
"check_password_quality: lt_dlopen failed: (%s) %s.\n",
pp->pwdCheckModule, err, 0 );
ok = LDAP_OTHER; /* internal error */
} else {
int (*prog)( char *passwd, char **text, Entry *ent );
if ((prog = lt_dlsym( mod, "check_password" )) == NULL) {
err = lt_dlerror();
Debug(LDAP_DEBUG_ANY,
"check_password_quality: lt_dlsym failed: (%s) %s.\n",
pp->pwdCheckModule, err, 0 );
ok = LDAP_OTHER;
} else {
char *txt = NULL;
ldap_pvt_thread_mutex_lock( &chk_syntax_mutex );
ok = prog( cred->bv_val, &txt, e );
ldap_pvt_thread_mutex_unlock( &chk_syntax_mutex );
if (txt) {
Debug(LDAP_DEBUG_ANY,
"check_password_quality: module error: (%s) %s.[%d]\n",
pp->pwdCheckModule, txt, ok );
free(txt);
} else
ok = LDAP_SUCCESS;
}
lt_dlclose( mod );
}
#else
Debug(LDAP_DEBUG_ANY, "check_password_quality: external modules not "
"supported. pwdCheckModule ignored.\n", 0, 0, 0);
#endif /* SLAPD_MODULES */
}
if (ok != LDAP_SUCCESS) {
rc = LDAP_CONSTRAINT_VIOLATION;
if (err) *err = PP_insufficientPasswordQuality;
}
return rc;
}
static int
parse_pwdhistory( struct berval *bv, char **oid, time_t *oldtime, struct berval *oldpw )
{
char *ptr;
struct berval nv, npw;
int i, j;
assert (bv && (bv->bv_len > 0) && (bv->bv_val) && oldtime && oldpw );
if ( oid ) *oid = 0;
*oldtime = (time_t)-1;
oldpw->bv_val = NULL;
oldpw->bv_len = 0;
ber_dupbv( &nv, bv );
/* first get the time field */
for(i=0; (i < nv.bv_len) && (nv.bv_val[i] != '#'); i++);
if ( i == nv.bv_len) goto exit_failure; /* couldn't locate the '#' separator */
nv.bv_val[i++] = '\0'; /* terminate the string & move to next field */
ptr = nv.bv_val;
*oldtime = parse_time( ptr );
if (*oldtime == (time_t)-1) goto exit_failure;
/* get the OID field */
for(ptr = &(nv.bv_val[i]);(i < nv.bv_len) && (nv.bv_val[i] != '#'); i++);
if ( i == nv.bv_len) goto exit_failure; /* couldn't locate the '#' separator */
nv.bv_val[i++] = '\0'; /* terminate the string & move to next field */
if ( oid ) *oid = ber_strdup( ptr );
/* get the length field */
for(ptr = &(nv.bv_val[i]);(i < nv.bv_len) && (nv.bv_val[i] != '#'); i++);
if ( i == nv.bv_len) goto exit_failure; /* couldn't locate the '#' separator */
nv.bv_val[i++] = '\0'; /* terminate the string & move to next field */
oldpw->bv_len = strtol( ptr, NULL, 10 );
if (errno == ERANGE) goto exit_failure;
/* lastly, get the octets of the string */
for(j=i, ptr = &(nv.bv_val[i]);i < nv.bv_len; i++);
if (i-j != oldpw->bv_len) goto exit_failure; /* length is wrong */
npw.bv_val = ptr;
npw.bv_len = oldpw->bv_len;
ber_dupbv( oldpw, &npw );
return LDAP_SUCCESS;
exit_failure:
if (oid && *oid) { ber_memfree(*oid); *oid = NULL; }
if (oldpw->bv_val) {
ber_memfree( oldpw->bv_val); oldpw->bv_val = NULL;
oldpw->bv_len = 0;
}
ber_memfree(nv.bv_val);
return LDAP_OTHER;
}
static void
add_to_pwd_history( pw_hist **l, time_t t,
struct berval *oldpw, struct berval *bv )
{
pw_hist *p, *p1, *p2;
if (!l) return;
p = ch_malloc( sizeof( pw_hist ));
p->pw = *oldpw;
ber_dupbv( &p->bv, bv );
p->t = t;
p->next = NULL;
if (*l == NULL) {
/* degenerate case */
*l = p;
return;
}
/*
* advance p1 and p2 such that p1 is the node before the
* new one, and p2 is the node after it
*/
for (p1 = NULL, p2 = *l; p2 && p2->t <= t; p1 = p2, p2=p2->next );
p->next = p2;
if (p1 == NULL) { *l = p; return; }
p1->next = p;
}
#ifndef MAX_PWD_HISTORY_SZ
#define MAX_PWD_HISTORY_SZ 1024
#endif /* MAX_PWD_HISTORY_SZ */
static void
make_pwd_history_value( char *timebuf, struct berval *bv, Attribute *pa )
{
char str[ MAX_PWD_HISTORY_SZ ];
int nlen;
snprintf( str, MAX_PWD_HISTORY_SZ,
"%s#%s#%d#", timebuf,
pa->a_desc->ad_type->sat_syntax->ssyn_oid,
pa->a_nvals[0].bv_len );
str[MAX_PWD_HISTORY_SZ-1] = 0;
nlen = strlen(str);
/*
* We have to assume that the string is a string of octets,
* not readable characters. In reality, yes, it probably is
* a readable (ie, base64) string, but we can't count on that
* Hence, while the first 3 fields of the password history
* are definitely readable (a timestamp, an OID and an integer
* length), the remaining octets of the actual password
* are deemed to be binary data.
*/
AC_MEMCPY( str + nlen, pa->a_nvals[0].bv_val, pa->a_nvals[0].bv_len );
nlen += pa->a_nvals[0].bv_len;
bv->bv_val = ch_malloc( nlen + 1 );
AC_MEMCPY( bv->bv_val, str, nlen );
bv->bv_val[nlen] = '\0';
bv->bv_len = nlen;
}
static void
free_pwd_history_list( pw_hist **l )
{
pw_hist *p;
if (!l) return;
p = *l;
while (p) {
pw_hist *pp = p->next;
free(p->pw.bv_val);
free(p->bv.bv_val);
free(p);
p = pp;
}
*l = NULL;
}
typedef struct ppbind {
slap_overinst *on;
int send_ctrl;
Modifications *mod;
LDAPPasswordPolicyError pErr;
PassPolicy pp;
} ppbind;
static int
ppolicy_bind_resp( Operation *op, SlapReply *rs )
{
ppbind *ppb = op->o_callback->sc_private;
slap_overinst *on = ppb->on;
Modifications *mod = ppb->mod, *m;
int pwExpired = 0;
int ngut = -1, warn = -1, age, rc, i;
Attribute *a;
struct tm *tm;
time_t now, then, pwtime = (time_t)-1;
const char *txt;
char nowstr[ LDAP_LUTIL_GENTIME_BUFSIZE ];
BackendInfo *bi = op->o_bd->bd_info;
Entry *e;
/* If we already know it's locked, just get on with it */
if ( ppb->pErr != PP_noError ) {
goto locked;
}
op->o_bd->bd_info = (BackendInfo *)on->on_info;
rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &e );
op->o_bd->bd_info = bi;
if ( rc != LDAP_SUCCESS ) {
return SLAP_CB_CONTINUE;
}
now = slap_get_time(); /* stored for later consideration */
ldap_pvt_thread_mutex_lock( &gmtime_mutex );
tm = gmtime(&now);
lutil_gentime( nowstr, sizeof(nowstr), tm );
ldap_pvt_thread_mutex_unlock( &gmtime_mutex );
if ( rs->sr_err == LDAP_INVALID_CREDENTIALS ) {
int i = 0, fc = 0;
m = ch_calloc( sizeof(Modifications), 1 );
m->sml_op = LDAP_MOD_ADD;
m->sml_type = ad_pwdFailureTime->ad_cname;
m->sml_desc = ad_pwdFailureTime;
m->sml_values = ch_calloc( sizeof(struct berval), 2 );
ber_str2bv( nowstr, 0, 1, &m->sml_values[0] );
m->sml_next = mod;
mod = m;
/*
* Count the pwdFailureTimes - if it's
* greater than the policy pwdMaxFailure,
* then lock the account.
*/
if ((a = attr_find( e->e_attrs, ad_pwdFailureTime )) != NULL) {
for(i=0; a->a_nvals[i].bv_val; i++) {
/*
* If the interval is 0, then failures
* stay on the record until explicitly
* reset by successful authentication.
*/
if (ppb->pp.pwdFailureCountInterval == 0) {
fc++;
} else if (now <=
parse_time(a->a_nvals[i].bv_val) +
ppb->pp.pwdFailureCountInterval) {
fc++;
}
/*
* We only count those failures
* which are not due to expire.
*/
}
}
if ((ppb->pp.pwdMaxFailure > 0) &&
(fc >= ppb->pp.pwdMaxFailure - 1)) {
/*
* We subtract 1 from the failure max
* because the new failure entry hasn't
* made it to the entry yet.
*/
m = ch_calloc( sizeof(Modifications), 1 );
m->sml_op = LDAP_MOD_REPLACE;
m->sml_type = ad_pwdAccountLockedTime->ad_cname;
m->sml_desc = ad_pwdAccountLockedTime;
m->sml_values = ch_calloc( sizeof(struct berval), 2 );
ber_str2bv( nowstr, 0, 1, &m->sml_values[0] );
m->sml_next = mod;
mod = m;
}
} else if ( rs->sr_err == LDAP_SUCCESS ) {
if ((a = attr_find( e->e_attrs, ad_pwdChangedTime )) != NULL)
pwtime = parse_time( a->a_nvals[0].bv_val );
/* delete all pwdFailureTimes */
if ( attr_find( e->e_attrs, ad_pwdFailureTime )) {
m = ch_calloc( sizeof(Modifications), 1 );
m->sml_op = LDAP_MOD_DELETE;
m->sml_type = ad_pwdFailureTime->ad_cname;
m->sml_desc = ad_pwdFailureTime;
m->sml_next = mod;
mod = m;
}
/*
* check to see if the password must be changed
*/
if ( ppb->pp.pwdMustChange &&
(a = attr_find( e->e_attrs, ad_pwdReset )) &&
!strcmp( a->a_nvals[0].bv_val, "TRUE" ) ) {
/*
* need to inject client controls here to give
* more information. For the moment, we ensure
* that we are disallowed from doing anything
* other than change password.
*/
pwcons[op->o_conn->c_conn_idx].restrict = 1;
ppb->pErr = PP_changeAfterReset;
} else {
/*
* the password does not need to be changed, so
* we now check whether the password has expired.
*
* We can skip this bit if passwords don't age in
* the policy.
*/
if (ppb->pp.pwdMaxAge == 0) goto grace;
if (pwtime == (time_t)-1) {
/*
* Hmm. No password changed time on the
* entry. This is odd - it should have
* been provided when the attribute was added.
*
* However, it's possible that it could be
* missing if the DIT was established via
* an import process.
*/
Debug( LDAP_DEBUG_ANY,
"ppolicy_bind: Entry %s does not have valid pwdChangedTime attribute - assuming password expired\n",
e->e_name.bv_val, 0, 0);
pwExpired = 1;
} else {
/*
* Check: was the last change time of
* the password older than the maximum age
* allowed. (Ignore case 2 from I-D, it's just silly.)
*/
if (now - pwtime > ppb->pp.pwdMaxAge ) pwExpired = 1;
}
}
grace:
if (!pwExpired) goto check_expiring_password;
if ((a = attr_find( e->e_attrs, ad_pwdGraceUseTime )) == NULL)
ngut = ppb->pp.pwdGraceLoginLimit;
else {
for(ngut=0; a->a_nvals[ngut].bv_val; ngut++);
ngut = ppb->pp.pwdGraceLoginLimit - ngut;
}
/*
* ngut is the number of remaining grace logins
*/
Debug( LDAP_DEBUG_ANY,
"ppolicy_bind: Entry %s has an expired password: %d grace logins\n",
e->e_name.bv_val, ngut, 0);
if (ngut < 1) {
ppb->pErr = PP_passwordExpired;
rs->sr_err = LDAP_INVALID_CREDENTIALS;
goto done;
}
/*
* Add a grace user time to the entry
*/
m = ch_calloc( sizeof(Modifications), 1 );
m->sml_op = LDAP_MOD_ADD;
m->sml_type = ad_pwdGraceUseTime->ad_cname;
m->sml_desc = ad_pwdGraceUseTime;
m->sml_values = ch_calloc( sizeof(struct berval), 2 );
ber_str2bv( nowstr, 0, 1, &m->sml_values[0] );
m->sml_next = mod;
mod = m;
check_expiring_password:
/*
* Now we need to check to see
* if it is about to expire, and if so, should the user
* be warned about it in the password policy control.
*
* If the password has expired, and we're in the grace period, then
* we don't need to do this bit. Similarly, if we don't have password
* aging, then there's no need to do this bit either.
*/
if ((ppb->pp.pwdMaxAge < 1) || (pwExpired) || (ppb->pp.pwdExpireWarning < 1))
goto done;
age = (int)(now - pwtime);
/*
* We know that there is a password Change Time attribute - if
* there wasn't, then the pwdExpired value would be true, unless
* there is no password aging - and if there is no password aging,
* then this section isn't called anyway - you can't have an
* expiring password if there's no limit to expire.
*/
if (ppb->pp.pwdMaxAge - age < ppb->pp.pwdExpireWarning ) {
/*
* Set the warning value, add expiration warned timestamp to the entry.
*/
if ((a = attr_find( e->e_attrs, ad_pwdExpirationWarned )) == NULL) {
m = ch_calloc( sizeof(Modifications), 1 );
m->sml_op = LDAP_MOD_ADD;
m->sml_type = ad_pwdExpirationWarned->ad_cname;
m->sml_desc = ad_pwdExpirationWarned;
m->sml_values = ch_calloc( sizeof(struct berval), 2 );
ber_str2bv( nowstr, 0, 1, &m->sml_values[0] );
m->sml_next = mod;
mod = m;
}
warn = ppb->pp.pwdMaxAge - age; /* seconds left until expiry */
if (warn < 0) warn = 0; /* something weird here - why is pwExpired not set? */
Debug( LDAP_DEBUG_ANY,
"ppolicy_bind: Setting warning for password expiry for %s = %d seconds\n",
op->o_req_dn.bv_val, warn, 0 );
}
}
done:
op->o_bd->bd_info = (BackendInfo *)on->on_info;
be_entry_release_r( op, e );
locked:
if ( mod ) {
Operation op2 = *op;
SlapReply r2 = { REP_RESULT };
slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
/* FIXME: Need to handle replication of some (but not all)
* of the operational attributes...
*/
op2.o_tag = LDAP_REQ_MODIFY;
op2.o_callback = &cb;
op2.orm_modlist = mod;
op2.o_dn = op->o_bd->be_rootdn;
op2.o_ndn = op->o_bd->be_rootndn;
op2.o_bd->bd_info = (BackendInfo *)on->on_info;
rc = op->o_bd->be_modify( &op2, &r2 );
slap_mods_free( mod );
}
if ( ppb->send_ctrl ) {
LDAPControl **ctrls = NULL;
pp_info *pi = on->on_bi.bi_private;
/* Do we really want to tell that the account is locked? */
if ( ppb->pErr == PP_accountLocked && !pi->use_lockout ) {
ppb->pErr = PP_noError;
}
ctrls = ch_calloc( sizeof( LDAPControl *) , 2 );
ctrls[0] = create_passcontrol( warn, ngut, ppb->pErr );
ctrls[1] = NULL;
rs->sr_ctrls = ctrls;
}
op->o_bd->bd_info = bi;
return SLAP_CB_CONTINUE;
}
static int
ppolicy_bind( Operation *op, SlapReply *rs )
{
slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
/* Root bypasses policy */
if ( !be_isroot_dn( op->o_bd, &op->o_req_ndn )) {
Entry *e;
int i, rc;
ppbind *ppb;
slap_callback *cb;
op->o_bd->bd_info = (BackendInfo *)on->on_info;
rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &e );
if ( rc != LDAP_SUCCESS ) {
return SLAP_CB_CONTINUE;
}
cb = op->o_tmpcalloc( sizeof(ppbind)+sizeof(slap_callback),
1, op->o_tmpmemctx );
ppb = (ppbind *)(cb+1);
ppb->on = on;
ppb->pErr = PP_noError;
/* Setup a callback so we can munge the result */
cb->sc_response = ppolicy_bind_resp;
cb->sc_next = op->o_callback->sc_next;
cb->sc_private = ppb;
op->o_callback->sc_next = cb;
/* Did we receive a password policy request control? */
if ( op->o_ctrlflag[ppolicy_cid] ) {
ppb->send_ctrl = 1;
}
op->o_bd->bd_info = (BackendInfo *)on;
ppolicy_get( op, e, &ppb->pp );
rc = account_locked( op, e, &ppb->pp, &ppb->mod );
op->o_bd->bd_info = (BackendInfo *)on->on_info;
be_entry_release_r( op, e );
if ( rc ) {
/* This will be the Draft 8 response, Unwilling is bogus */
ppb->pErr = PP_accountLocked;
send_ldap_error( op, rs, LDAP_INVALID_CREDENTIALS, NULL );
return rs->sr_err;
}
}
return SLAP_CB_CONTINUE;
}
/* Reset the restrict flag for the next session on this connection */
static int
ppolicy_unbind( Operation *op, SlapReply *rs )
{
pwcons[op->o_conn->c_conn_idx].restrict = 0;
return SLAP_CB_CONTINUE;
}
/* Check if this connection is restricted */
static int
ppolicy_restrict(
Operation *op,
SlapReply *rs )
{
slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
int i, send_ctrl = 0;
/* Did we receive a password policy request control? */
if ( op->o_ctrlflag[ppolicy_cid] ) {
send_ctrl = 1;
}
if ( op->o_conn && pwcons[op->o_conn->c_conn_idx].restrict ) {
Debug( LDAP_DEBUG_TRACE,
"connection restricted to password changing only\n", 0, 0, 0);
if ( send_ctrl ) {
LDAPControl **ctrls = NULL;
ctrls = ch_calloc( sizeof( LDAPControl *) , 2 );
ctrls[0] = create_passcontrol( -1, -1, PP_changeAfterReset );
ctrls[1] = NULL;
rs->sr_ctrls = ctrls;
}
op->o_bd->bd_info = (BackendInfo *)on->on_info;
send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
"Operations are restricted to bind/unbind/abandon/StartTLS/modify password" );
return rs->sr_err;
}
return SLAP_CB_CONTINUE;
}
static int
ppolicy_add(
Operation *op,
SlapReply *rs )
{
slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
pp_info *pi = on->on_bi.bi_private;
PassPolicy pp;
int pw;
Attribute *pa;
const char *txt;
if ( ppolicy_restrict( op, rs ) != SLAP_CB_CONTINUE )
return rs->sr_err;
/* Check for password in entry */
if ((pa = attr_find( op->oq_add.rs_e->e_attrs,
slap_schema.si_ad_userPassword )))
{
/*
* new entry contains a password - if we're not the root user
* then we need to check that the password fits in with the
* security policy for the new entry.
*/
ppolicy_get( op, op->ora_e, &pp );
if (pp.pwdCheckQuality > 0 && !be_isroot( op )) {
struct berval *bv = &(pa->a_vals[0]);
int rc, i, send_ctrl = 0;
LDAPPasswordPolicyError pErr = PP_noError;
/* Did we receive a password policy request control? */
if ( op->o_ctrlflag[ppolicy_cid] ) {
send_ctrl = 1;
}
rc = check_password_quality( bv, &pp, &pErr, op->ora_e );
if (rc != LDAP_SUCCESS) {
op->o_bd->bd_info = (BackendInfo *)on->on_info;
if ( send_ctrl ) {
LDAPControl **ctrls = NULL;
ctrls = ch_calloc( sizeof( LDAPControl *) , 2 );
ctrls[0] = create_passcontrol( -1, -1, pErr );
ctrls[1] = NULL;
rs->sr_ctrls = ctrls;
}
send_ldap_error( op, rs, rc, "Password fails quality checking policy" );
return rs->sr_err;
}
/*
* A controversial bit. We hash cleartext
* passwords provided via add and modify operations
* You're not really supposed to do this, since
* the X.500 model says "store attributes" as they
* get provided. By default, this is what we do
*
* But if the hash_passwords flag is set, we hash
* any cleartext password attribute values via the
* default password hashing scheme.
*/
if ((pi->hash_passwords) &&
(password_scheme( &(pa->a_vals[0]), NULL ) != LDAP_SUCCESS)) {
struct berval hpw;
slap_passwd_hash( &(pa->a_vals[0]), &hpw, &txt );
if (hpw.bv_val == NULL) {
/*
* hashing didn't work. Emit an error.
*/
rs->sr_err = LDAP_OTHER;
rs->sr_text = txt;
send_ldap_error( op, rs, LDAP_OTHER, "Password hashing failed" );
return rs->sr_err;
}
memset( pa->a_vals[0].bv_val, 0, pa->a_vals[0].bv_len);
ber_memfree( pa->a_vals[0].bv_val );
pa->a_vals[0].bv_val = hpw.bv_val;
pa->a_vals[0].bv_len = hpw.bv_len;
}
}
/* If password aging is in effect, set the pwdChangedTime */
if (( pp.pwdMaxAge || pp.pwdMinAge ) && !be_shadow_update( op )) {
struct berval timestamp;
char timebuf[ LDAP_LUTIL_GENTIME_BUFSIZE ];
struct tm *ltm;
time_t now = slap_get_time();
ldap_pvt_thread_mutex_lock( &gmtime_mutex );
ltm = gmtime( &now );
lutil_gentime( timebuf, sizeof(timebuf), ltm );
ldap_pvt_thread_mutex_unlock( &gmtime_mutex );
timestamp.bv_val = timebuf;
timestamp.bv_len = strlen(timebuf);
attr_merge_one( op->ora_e, ad_pwdChangedTime, &timestamp, NULL );
}
}
return SLAP_CB_CONTINUE;
}
static int
ppolicy_modify( Operation *op, SlapReply *rs )
{
slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
pp_info *pi = on->on_bi.bi_private;
int i, rc, mod_pw_only, pwmod, pwmop, deladd,
hsize = 0;
PassPolicy pp;
Modifications *mods = NULL, *modtail, *ml, *delmod, *addmod;
Attribute *pa, *ha, *ra, at;
const char *txt;
pw_hist *tl = NULL, *p;
int zapReset, send_ctrl = 0;
Entry *e;
struct berval newpw = BER_BVNULL, oldpw = BER_BVNULL,
*bv, cr[2];
LDAPPasswordPolicyError pErr = PP_noError;
op->o_bd->bd_info = (BackendInfo *)on->on_info;
rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &e );
op->o_bd->bd_info = (BackendInfo *)on;
if ( rc != LDAP_SUCCESS ) return SLAP_CB_CONTINUE;
/* Did we receive a password policy request control? */
if ( op->o_ctrlflag[ppolicy_cid] ) {
send_ctrl = 1;
}
/* See if this is a pwdModify exop. If so, we can
* access the plaintext passwords from that request.
*/
{
slap_callback *sc;
for ( sc = op->o_callback; sc; sc=sc->sc_next ) {
if ( sc->sc_response == slap_replog_cb &&
sc->sc_private ) {
req_pwdexop_s *qpw = sc->sc_private;
newpw = qpw->rs_new;
oldpw = qpw->rs_old;
break;
}
}
}
ppolicy_get( op, e, &pp );
for(ml = op->oq_modify.rs_modlist,
pwmod = 0, mod_pw_only = 1,
deladd = 0, delmod = NULL,
addmod = NULL,
zapReset = 1;
ml != NULL; modtail = ml, ml = ml->sml_next ) {
if ( ml->sml_desc == pp.ad ) {
pwmod = 1;
pwmop = ml->sml_op;
if ((deladd == 0) && (ml->sml_op == LDAP_MOD_DELETE) &&
(ml->sml_values) && (ml->sml_values[0].bv_val != NULL)) {
deladd = 1;
delmod = ml;
}
if ((deladd == 1) && ((ml->sml_op == LDAP_MOD_ADD) ||
(ml->sml_op == LDAP_MOD_REPLACE)))
deladd = 2;
if ((ml->sml_op == LDAP_MOD_ADD) ||
(ml->sml_op == LDAP_MOD_REPLACE))
addmod = ml;
} else if (! is_at_operational( ml->sml_desc->ad_type )) {
mod_pw_only = 0;
/* modifying something other than password */
}
/*
* If there is a request to explicitly add a pwdReset
* attribute, then we suppress the normal behaviour on
* password change, which is to remove the pwdReset
* attribute.
*
* This enables an administrator to assign a new password
* and place a "must reset" flag on the entry, which will
* stay until the user explicitly changes his/her password.
*/
if (ml->sml_desc == ad_pwdReset ) {
if ((ml->sml_op == LDAP_MOD_ADD) ||
(ml->sml_op == LDAP_MOD_REPLACE))
zapReset = 0;
}
}
if (pwcons[op->o_conn->c_conn_idx].restrict && !mod_pw_only) {
Debug( LDAP_DEBUG_TRACE,
"connection restricted to password changing only\n", 0, 0, 0 );
rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
rs->sr_text = "Operations are restricted to bind/unbind/abandon/StartTLS/modify password";
pErr = PP_changeAfterReset;
goto return_results;
}
/*
* if we have a "safe password modify policy", then we need to check if we're doing
* a delete (with the old password), followed by an add (with the new password).
*
* If we don't have this, then we fail with an error. We also skip all the checks if
* the root user is bound. Root can do anything, including avoid the policies.
*/
if (!pwmod) goto do_modify;
/*
* Did we get a valid add mod?
*/
if (!addmod) {
rs->sr_err = LDAP_OTHER;
rs->sr_text = "Internal Error";
Debug( LDAP_DEBUG_TRACE,
"cannot locate modification supplying new password\n", 0, 0, 0 );
goto return_results;
}
/*
* Build the password history list in ascending time order
* We need this, even if the user is root, in order to maintain
* the pwdHistory operational attributes properly.
*/
if (pp.pwdInHistory > 0 && (ha = attr_find( e->e_attrs, ad_pwdHistory ))) {
struct berval oldpw;
time_t oldtime;
char *oid;
for(i=0; ha->a_nvals[i].bv_val; i++) {
rc = parse_pwdhistory( &(ha->a_nvals[i]), NULL,
&oldtime, &oldpw );
if (rc != LDAP_SUCCESS) continue; /* invalid history entry */
if (oldpw.bv_val) {
add_to_pwd_history( &tl, oldtime, &oldpw,
&(ha->a_nvals[i]) );
oldpw.bv_val = NULL;
oldpw.bv_len = 0;
}
}
for(p=tl; p; p=p->next, hsize++); /* count history size */
}
if (be_isroot( op )) goto do_modify;
/* This is a pwdModify exop that provided the old pw.
* We need to create a Delete mod for this old pw and
* let the matching value get found later
*/
if (pp.pwdSafeModify && oldpw.bv_val ) {
ml = (Modifications *) ch_malloc( sizeof( Modifications ) );
ml->sml_op = LDAP_MOD_DELETE;
ml->sml_desc = pp.ad;
ml->sml_type = pp.ad->ad_cname;
ml->sml_values = (BerVarray) ch_malloc( 2 * sizeof( struct berval ) );
ber_dupbv( &ml->sml_values[0], &oldpw );
ml->sml_values[1].bv_len = 0;
ml->sml_values[1].bv_val = NULL;
ml->sml_nvalues = NULL;
ml->sml_next = op->orm_modlist;
op->orm_modlist = ml;
delmod = ml;
deladd = 2;
}
if (pp.pwdSafeModify && deladd != 2) {
Debug( LDAP_DEBUG_TRACE,
"change password must use DELETE followed by ADD/REPLACE\n",
0, 0, 0 );
rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
rs->sr_text = "Must supply old password to be changed as well as new one";
pErr = PP_mustSupplyOldPassword;
goto return_results;
}
if (!pp.pwdAllowUserChange) {
rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
rs->sr_text = "User alteration of password is not allowed";
pErr = PP_passwordModNotAllowed;
goto return_results;
}
if (pp.pwdMinAge > 0) {
time_t pwtime = (time_t)-1, now;
int age;
if ((pa = attr_find( e->e_attrs, ad_pwdChangedTime )) != NULL)
pwtime = parse_time( pa->a_nvals[0].bv_val );
now = slap_get_time();
age = (int)(now - pwtime);
if ((pwtime != (time_t)-1) && (age < pp.pwdMinAge)) {
rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
rs->sr_text = "Password is too young to change";
pErr = PP_passwordTooYoung;
goto return_results;
}
}
/* pa is used in password history check below, be sure it's set */
if ((pa = attr_find( e->e_attrs, pp.ad )) != NULL && delmod) {
/*
* we have a password to check
*/
const char *txt;
bv = oldpw.bv_val ? &oldpw : delmod->sml_values;
/* FIXME: no access checking? */
rc = slap_passwd_check( op, NULL, pa, bv, &txt );
if (rc != LDAP_SUCCESS) {
Debug( LDAP_DEBUG_TRACE,
"old password check failed: %s\n", txt, 0, 0 );
rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
rs->sr_text = "Must supply correct old password to change to new one";
pErr = PP_mustSupplyOldPassword;
goto return_results;
} else {
int i;
/*
* replace the delete value with the (possibly hashed)
* value which is currently in the password.
*/
for(i=0; delmod->sml_values[i].bv_val; i++) {
free(delmod->sml_values[i].bv_val);
delmod->sml_values[i].bv_len = 0;
}
free(delmod->sml_values);
delmod->sml_values = ch_calloc( sizeof(struct berval), 2 );
delmod->sml_values[1].bv_len = 0;
delmod->sml_values[1].bv_val = NULL;
ber_dupbv(&(delmod->sml_values[0]), &(pa->a_nvals[0]));
}
}
bv = newpw.bv_val ? &newpw : addmod->sml_values;
if (pp.pwdCheckQuality > 0) {
rc = check_password_quality( bv, &pp, &pErr, e );
if (rc != LDAP_SUCCESS) {
rs->sr_err = rc;
rs->sr_text = "Password fails quality checking policy";
goto return_results;
}
}
if (pa) {
/*
* Last check - the password history.
*/
/* FIXME: no access checking? */
if (slap_passwd_check( op, NULL, pa, bv, &txt ) == LDAP_SUCCESS) {
/*
* This is bad - it means that the user is attempting
* to set the password to the same as the old one.
*/
rs->sr_err = LDAP_CONSTRAINT_VIOLATION;
rs->sr_text = "Password is not being changed from existing value";
pErr = PP_passwordInHistory;
goto return_results;
}
if (pp.pwdInHistory < 1) goto do_modify;
/*
* Iterate through the password history, and fail on any
* password matches.
*/
at = *pa;
at.a_vals = cr;
cr[1].bv_val = NULL;
for(p=tl; p; p=p->next) {
cr[0] = p->pw;
/* FIXME: no access checking? */
rc = slap_passwd_check( op, NULL, &at, bv, &txt );
if (rc != LDAP_SUCCESS) continue;
rs->sr_err = LDAP_CONSTRAINT_VIOLATION;
rs->sr_text = "Password is in history of old passwords";
pErr = PP_passwordInHistory;
goto return_results;
}
}
do_modify:
if ((pwmod) && (!be_shadow_update( op ))) {
struct berval timestamp;
char timebuf[ LDAP_LUTIL_GENTIME_BUFSIZE ];
struct tm *ltm;
time_t now = slap_get_time();
Attribute *ga;
/*
* keep the necessary pwd.. operational attributes
* up to date.
*/
ldap_pvt_thread_mutex_lock( &gmtime_mutex );
ltm = gmtime( &now );
lutil_gentime( timebuf, sizeof(timebuf), ltm );
ldap_pvt_thread_mutex_unlock( &gmtime_mutex );
timestamp.bv_val = timebuf;
timestamp.bv_len = strlen(timebuf);
mods = (Modifications *) ch_malloc( sizeof( Modifications ) );
mods->sml_type.bv_val = NULL;
mods->sml_desc = ad_pwdChangedTime;
if (pwmop != LDAP_MOD_DELETE) {
mods->sml_op = LDAP_MOD_REPLACE;
mods->sml_values = (BerVarray) ch_malloc( 2 * sizeof( struct berval ) );
ber_dupbv( &mods->sml_values[0], &timestamp );
mods->sml_values[1].bv_len = 0;
mods->sml_values[1].bv_val = NULL;
assert( mods->sml_values[0].bv_val );
} else {
mods->sml_op = LDAP_MOD_DELETE;
mods->sml_values = NULL;
}
mods->sml_nvalues = NULL;
mods->sml_next = NULL;
modtail->sml_next = mods;
modtail = mods;
if (attr_find(e->e_attrs, ad_pwdGraceUseTime )) {
mods = (Modifications *) ch_malloc( sizeof( Modifications ) );
mods->sml_op = LDAP_MOD_DELETE;
mods->sml_type.bv_val = NULL;
mods->sml_desc = ad_pwdGraceUseTime;
mods->sml_values = NULL;
mods->sml_nvalues = NULL;
mods->sml_next = NULL;
modtail->sml_next = mods;
modtail = mods;
}
if (attr_find(e->e_attrs, ad_pwdExpirationWarned )) {
mods = (Modifications *) ch_malloc( sizeof( Modifications ) );
mods->sml_op = LDAP_MOD_DELETE;
mods->sml_type.bv_val = NULL;
mods->sml_desc = ad_pwdExpirationWarned;
mods->sml_values = NULL;
mods->sml_nvalues = NULL;
mods->sml_next = NULL;
modtail->sml_next = mods;
modtail = mods;
}
/* Delete the pwdReset attribute, since it's being reset */
if ((zapReset) && (attr_find(e->e_attrs, ad_pwdReset ))) {
mods = (Modifications *) ch_malloc( sizeof( Modifications ) );
mods->sml_op = LDAP_MOD_DELETE;
mods->sml_type.bv_val = NULL;
mods->sml_desc = ad_pwdReset;
mods->sml_values = NULL;
mods->sml_nvalues = NULL;
mods->sml_next = NULL;
modtail->sml_next = mods;
modtail = mods;
}
if (pp.pwdInHistory > 0) {
if (hsize >= pp.pwdInHistory) {
/*
* We use the >= operator, since we are going to add
* the existing password attribute value into the
* history - thus the cardinality of history values is
* about to rise by one.
*
* If this would push it over the limit of history
* values (remembering - the password policy could have
* changed since the password was last altered), we must
* delete at least 1 value from the pwdHistory list.
*
* In fact, we delete '(#pwdHistory attrs - max pwd
* history length) + 1' values, starting with the oldest.
* This is easily evaluated, since the linked list is
* created in ascending time order.
*/
mods = (Modifications *) ch_malloc( sizeof( Modifications ) );
mods->sml_op = LDAP_MOD_DELETE;
mods->sml_type.bv_val = NULL;
mods->sml_desc = ad_pwdHistory;
mods->sml_nvalues = NULL;
mods->sml_values = ch_calloc( sizeof( struct berval ),
hsize - pp.pwdInHistory + 2 );
mods->sml_values[ hsize - pp.pwdInHistory + 1 ].bv_val = NULL;
mods->sml_values[ hsize - pp.pwdInHistory + 1 ].bv_len = 0;
for(i=0,p=tl; i < (hsize - pp.pwdInHistory + 1); i++, p=p->next) {
mods->sml_values[i].bv_val = NULL;
mods->sml_values[i].bv_len = 0;
ber_dupbv( &(mods->sml_values[i]), &p->bv );
}
mods->sml_next = NULL;
modtail->sml_next = mods;
modtail = mods;
}
free_pwd_history_list( &tl );
/*
* Now add the existing password into the history list.
* This will be executed even if the operation is to delete
* the password entirely.
*
* This isn't in the spec explicitly, but it seems to make
* sense that the password history list is the list of all
* previous passwords - even if they were deleted. Thus, if
* someone tries to add a historical password at some future
* point, it will fail.
*/
if ((pa = attr_find( e->e_attrs, pp.ad )) != NULL) {
mods = (Modifications *) ch_malloc( sizeof( Modifications ) );
mods->sml_op = LDAP_MOD_ADD;
mods->sml_type.bv_val = NULL;
mods->sml_desc = ad_pwdHistory;
mods->sml_nvalues = NULL;
mods->sml_values = ch_calloc( sizeof( struct berval ), 2 );
mods->sml_values[ 1 ].bv_val = NULL;
mods->sml_values[ 1 ].bv_len = 0;
make_pwd_history_value( timebuf, &mods->sml_values[0], pa );
mods->sml_next = NULL;
modtail->sml_next = mods;
modtail = mods;
} else {
Debug( LDAP_DEBUG_TRACE,
"ppolicy_modify: password attr lookup failed\n", 0, 0, 0 );
}
}
/*
* Controversial bit here. If the new password isn't hashed
* (ie, is cleartext), we probably should hash it according
* to the default hash. The reason for this is that we want
* to use the policy if possible, but if we hash the password
* before, then we're going to run into trouble when it
* comes time to check the password.
*
* Now, the right thing to do is to use the extended password
* modify operation, but not all software can do this,
* therefore it makes sense to hash the new password, now
* we know it passes the policy requirements.
*
* Of course, if the password is already hashed, then we
* leave it alone.
*/
if ((pi->hash_passwords) && (addmod) && !newpw.bv_val &&
(password_scheme( &(addmod->sml_values[0]), NULL ) != LDAP_SUCCESS)) {
struct berval hpw, bv;
slap_passwd_hash( &(addmod->sml_values[0]), &hpw, &txt );
if (hpw.bv_val == NULL) {
/*
* hashing didn't work. Emit an error.
*/
rs->sr_err = LDAP_OTHER;
rs->sr_text = txt;
goto return_results;
}
bv.bv_val = addmod->sml_values[0].bv_val;
bv.bv_len = addmod->sml_values[0].bv_len;
/* clear and discard the clear password */
memset(bv.bv_val, 0, bv.bv_len);
ber_memfree(bv.bv_val);
addmod->sml_values[0].bv_val = hpw.bv_val;
addmod->sml_values[0].bv_len = hpw.bv_len;
}
}
op->o_bd->bd_info = (BackendInfo *)on->on_info;
be_entry_release_r( op, e );
return SLAP_CB_CONTINUE;
return_results:
free_pwd_history_list( &tl );
op->o_bd->bd_info = (BackendInfo *)on->on_info;
be_entry_release_r( op, e );
if ( send_ctrl ) {
LDAPControl **ctrls = NULL;
ctrls = ch_calloc( sizeof( LDAPControl *) , 2 );
ctrls[0] = create_passcontrol( -1, -1, pErr );
ctrls[1] = NULL;
rs->sr_ctrls = ctrls;
}
send_ldap_result( op, rs );
return rs->sr_err;
}
static int
ppolicy_parseCtrl(
Operation *op,
SlapReply *rs,
LDAPControl *ctrl )
{
if ( ctrl->ldctl_value.bv_len ) {
rs->sr_text = "passwordPolicyRequest control value not empty";
return LDAP_PROTOCOL_ERROR;
}
if ( ctrl->ldctl_iscritical ) {
rs->sr_text = "passwordPolicyRequest control invalid criticality";
return LDAP_PROTOCOL_ERROR;
}
op->o_ctrlflag[ppolicy_cid] = SLAP_CONTROL_NONCRITICAL;
return LDAP_SUCCESS;
}
static int
ppolicy_db_init(
BackendDB *be
)
{
slap_overinst *on = (slap_overinst *) be->bd_info;
/* Has User Schema been initialized yet? */
if ( !pwd_UsSchema[0].ad[0] ) {
const char *err;
int i, code;
for (i=0; pwd_UsSchema[i].def; i++) {
code = slap_str2ad( pwd_UsSchema[i].def, pwd_UsSchema[i].ad, &err );
if ( code ) {
fprintf( stderr, "User Schema Load failed %d: %s\n", code, err );
return code;
}
}
}
on->on_bi.bi_private = ch_calloc( sizeof(pp_info), 1 );
if ( dtblsize && !pwcons )
pwcons = ch_calloc(sizeof(pw_conn), dtblsize );
return 0;
}
static int
ppolicy_db_open(
BackendDB *be
)
{
return overlay_register_control( be, LDAP_CONTROL_PASSWORDPOLICYREQUEST );
}
static int
ppolicy_close(
BackendDB *be
)
{
slap_overinst *on = (slap_overinst *) be->bd_info;
pp_info *pi = on->on_bi.bi_private;
free( pwcons );
free( pi->def_policy.bv_val );
free( pi );
return 0;
}
static int
ppolicy_config(
BackendDB *be,
const char *fname,
int lineno,
int argc,
char **argv
)
{
slap_overinst *on = (slap_overinst *) be->bd_info;
pp_info *pi = on->on_bi.bi_private;
struct berval dn;
if ( strcasecmp( argv[0], "ppolicy_default" ) == 0 ) {
if ( argc != 2 ) {
fprintf( stderr, "%s: line %d: invalid arguments in \"ppolicy_default"
" <policyDN>\n", fname, lineno );
return ( 1 );
}
ber_str2bv( argv[1], 0, 0, &dn );
if ( dnNormalize( 0, NULL, NULL, &dn, &pi->def_policy, NULL ) ) {
fprintf( stderr, "%s: line %d: policyDN is invalid\n",
fname, lineno );
return 1;
}
return 0;
} else if ( strcasecmp( argv[0], "ppolicy_use_lockout" ) == 0 ) {
if ( argc != 1 ) {
fprintf( stderr, "%s: line %d: ppolicy_use_lockout "
"takes no arguments\n", fname, lineno );
return ( 1 );
}
pi->use_lockout = 1;
return 0;
} else if ( strcasecmp( argv[0], "ppolicy_hash_cleartext" ) == 0 ) {
if ( argc != 1 ) {
fprintf( stderr, "%s: line %d: ppolicy_hash_cleartext "
"takes no arguments\n", fname, lineno );
return ( 1 );
}
pi->hash_passwords = 1;
}
return SLAP_CONF_UNKNOWN;
}
static char *extops[] = {
LDAP_EXOP_MODIFY_PASSWD,
NULL
};
static slap_overinst ppolicy;
int ppolicy_init()
{
LDAPAttributeType *at;
const char *err;
int i, code;
for (i=0; pwd_OpSchema[i].def; i++) {
at = ldap_str2attributetype( pwd_OpSchema[i].def, &code, &err,
LDAP_SCHEMA_ALLOW_ALL );
if ( !at ) {
fprintf( stderr, "AttributeType Load failed %s %s\n",
ldap_scherr2str(code), err );
return code;
}
code = at_add( at, &err );
if ( !code ) {
slap_str2ad( at->at_names[0], pwd_OpSchema[i].ad, &err );
}
ldap_memfree( at );
if ( code ) {
fprintf( stderr, "AttributeType Load failed %s %s\n",
scherr2str(code), err );
return code;
}
}
code = register_supported_control( LDAP_CONTROL_PASSWORDPOLICYREQUEST,
SLAP_CTRL_ADD|SLAP_CTRL_BIND|SLAP_CTRL_MODIFY|SLAP_CTRL_HIDE, extops,
ppolicy_parseCtrl, &ppolicy_cid );
if ( code != LDAP_SUCCESS ) {
fprintf( stderr, "Failed to register control %d\n", code );
return code;
}
ldap_pvt_thread_mutex_init( &chk_syntax_mutex );
ppolicy.on_bi.bi_type = "ppolicy";
ppolicy.on_bi.bi_db_init = ppolicy_db_init;
ppolicy.on_bi.bi_db_open = ppolicy_db_open;
ppolicy.on_bi.bi_db_config = ppolicy_config;
ppolicy.on_bi.bi_db_close = ppolicy_close;
ppolicy.on_bi.bi_op_add = ppolicy_add;
ppolicy.on_bi.bi_op_bind = ppolicy_bind;
ppolicy.on_bi.bi_op_unbind = ppolicy_unbind;
ppolicy.on_bi.bi_op_compare = ppolicy_restrict;
ppolicy.on_bi.bi_op_delete = ppolicy_restrict;
ppolicy.on_bi.bi_op_modify = ppolicy_modify;
ppolicy.on_bi.bi_op_search = ppolicy_restrict;
return overlay_register( &ppolicy );
}
#if SLAPD_OVER_PPOLICY == SLAPD_MOD_DYNAMIC
int init_module(int argc, char *argv[]) {
return ppolicy_init();
}
#endif
#endif /* defined(SLAPD_OVER_PPOLICY) */
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