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538 lines
13 KiB
C
538 lines
13 KiB
C
/* smbk5pwd.c - Overlay for managing Samba and Heimdal passwords */
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/* $OpenLDAP$ */
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/*
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* Copyright 2004-2005 by Howard Chu, Symas Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#include <portable.h>
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#ifndef SLAPD_OVER_SMBK5PWD
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#define SLAPD_OVER_SMBK5PWD SLAPD_MOD_DYNAMIC
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#endif
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#ifdef SLAPD_OVER_SMBK5PWD
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#include <slap.h>
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#include <ac/errno.h>
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#ifdef DO_KRB5
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#include <ac/string.h>
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#include <lber.h>
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#include <lber_pvt.h>
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#include <lutil.h>
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/* make ASN1_MALLOC_ENCODE use our allocator */
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#define malloc ch_malloc
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#include <krb5.h>
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#include <kadm5/admin.h>
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#include <hdb.h>
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static krb5_context context;
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static void *kadm_context;
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static kadm5_config_params conf;
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static HDB *db;
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static AttributeDescription *ad_krb5Key;
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static AttributeDescription *ad_krb5KeyVersionNumber;
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static AttributeDescription *ad_krb5PrincipalName;
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static ObjectClass *oc_krb5KDCEntry;
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#endif
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#ifdef DO_SAMBA
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#include <openssl/des.h>
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#include <openssl/md4.h>
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static AttributeDescription *ad_sambaLMPassword;
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static AttributeDescription *ad_sambaNTPassword;
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static AttributeDescription *ad_sambaPwdLastSet;
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static ObjectClass *oc_sambaSamAccount;
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#endif
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#if 0
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static void smbk5pwd_destroy() {
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kadm5_destroy(kadm_context);
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krb5_free_context(context);
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}
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#endif
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#ifdef DO_SAMBA
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static const char hex[] = "0123456789abcdef";
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/* From liblutil/passwd.c... */
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static void lmPasswd_to_key(
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const unsigned char *lmPasswd,
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des_cblock *key)
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{
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/* make room for parity bits */
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((char *)key)[0] = lmPasswd[0];
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((char *)key)[1] = ((lmPasswd[0]&0x01)<<7) | (lmPasswd[1]>>1);
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((char *)key)[2] = ((lmPasswd[1]&0x03)<<6) | (lmPasswd[2]>>2);
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((char *)key)[3] = ((lmPasswd[2]&0x07)<<5) | (lmPasswd[3]>>3);
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((char *)key)[4] = ((lmPasswd[3]&0x0F)<<4) | (lmPasswd[4]>>4);
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((char *)key)[5] = ((lmPasswd[4]&0x1F)<<3) | (lmPasswd[5]>>5);
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((char *)key)[6] = ((lmPasswd[5]&0x3F)<<2) | (lmPasswd[6]>>6);
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((char *)key)[7] = ((lmPasswd[6]&0x7F)<<1);
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des_set_odd_parity( key );
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}
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#define MAX_PWLEN 256
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#define HASHLEN 16
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static void hexify(
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const char in[HASHLEN],
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struct berval *out
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)
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{
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int i;
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char *a;
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unsigned char *b;
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out->bv_val = ch_malloc(HASHLEN*2 + 1);
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out->bv_len = HASHLEN*2;
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a = out->bv_val;
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b = (unsigned char *)in;
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for (i=0; i<HASHLEN; i++) {
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*a++ = hex[*b >> 4];
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*a++ = hex[*b++ & 0x0f];
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}
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*a++ = '\0';
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}
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static void lmhash(
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struct berval *passwd,
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struct berval *hash
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)
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{
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char UcasePassword[15];
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des_cblock key;
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des_key_schedule schedule;
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des_cblock StdText = "KGS!@#$%";
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des_cblock hbuf[2];
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strncpy( UcasePassword, passwd->bv_val, 14 );
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UcasePassword[14] = '\0';
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ldap_pvt_str2upper( UcasePassword );
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lmPasswd_to_key( UcasePassword, &key );
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des_set_key_unchecked( &key, schedule );
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des_ecb_encrypt( &StdText, &hbuf[0], schedule , DES_ENCRYPT );
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lmPasswd_to_key( &UcasePassword[7], &key );
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des_set_key_unchecked( &key, schedule );
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des_ecb_encrypt( &StdText, &hbuf[1], schedule , DES_ENCRYPT );
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hexify( (char *)hbuf, hash );
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}
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static void nthash(
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struct berval *passwd,
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struct berval *hash
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)
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{
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/* Windows currently only allows 14 character passwords, but
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* may support up to 256 in the future. We assume this means
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* 256 UCS2 characters, not 256 bytes...
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*/
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char hbuf[HASHLEN];
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int i;
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MD4_CTX ctx;
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if (passwd->bv_len > MAX_PWLEN*2)
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passwd->bv_len = MAX_PWLEN*2;
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MD4_Init( &ctx );
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MD4_Update( &ctx, passwd->bv_val, passwd->bv_len );
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MD4_Final( hbuf, &ctx );
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hexify( hbuf, hash );
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}
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#endif /* DO_SAMBA */
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#ifdef DO_KRB5
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static int smbk5pwd_op_cleanup(
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Operation *op,
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SlapReply *rs )
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{
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slap_callback *cb;
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/* clear out the current key */
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ldap_pvt_thread_pool_setkey( op->o_threadctx, smbk5pwd_op_cleanup,
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NULL, NULL );
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/* free the callback */
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cb = op->o_callback;
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op->o_callback = cb->sc_next;
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op->o_tmpfree( cb, op->o_tmpmemctx );
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return 0;
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}
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static int smbk5pwd_op_bind(
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Operation *op,
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SlapReply *rs )
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{
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/* If this is a simple Bind, stash the Op pointer so our chk
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* function can find it. Set a cleanup callback to clear it
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* out when the Bind completes.
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*/
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if ( op->oq_bind.rb_method == LDAP_AUTH_SIMPLE ) {
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slap_callback *cb;
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ldap_pvt_thread_pool_setkey( op->o_threadctx, smbk5pwd_op_cleanup, op,
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NULL );
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cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
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cb->sc_cleanup = smbk5pwd_op_cleanup;
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cb->sc_next = op->o_callback;
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op->o_callback = cb;
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}
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return SLAP_CB_CONTINUE;
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}
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static LUTIL_PASSWD_CHK_FUNC chk_k5key;
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static const struct berval scheme = BER_BVC("{K5KEY}");
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/* This password scheme stores no data in the userPassword attribute
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* other than the scheme name. It assumes the invoking entry is a
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* krb5KDCentry and compares the passed-in credentials against the
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* krb5Key attribute. The krb5Key may be multi-valued, but they are
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* simply multiple keytypes generated from the same input string, so
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* only the first value needs to be compared here.
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*
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* Since the lutil_passwd API doesn't pass the Entry object in, we
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* have to fetch it ourselves in order to get access to the other
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* attributes. We accomplish this with the help of the overlay's Bind
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* function, which stores the current Operation pointer in thread-specific
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* storage so we can retrieve it here. The Operation provides all
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* the necessary context for us to get Entry from the database.
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*/
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static int chk_k5key(
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const struct berval *sc,
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const struct berval *passwd,
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const struct berval *cred,
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const char **text )
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{
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void *ctx;
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Operation *op;
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int rc;
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Entry *e;
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Attribute *a;
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krb5_error_code ret;
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krb5_keyblock key;
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krb5_salt salt;
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hdb_entry ent;
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/* Find our thread context, find our Operation */
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ctx = ldap_pvt_thread_pool_context();
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if ( ldap_pvt_thread_pool_getkey( ctx, smbk5pwd_op_cleanup, (void **)&op, NULL ) ||
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!op )
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return LUTIL_PASSWD_ERR;
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rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &e );
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if ( rc != LDAP_SUCCESS ) return LUTIL_PASSWD_ERR;
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rc = LUTIL_PASSWD_ERR;
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do {
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size_t l;
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Key ekey = {0};
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a = attr_find( e->e_attrs, ad_krb5PrincipalName );
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if (!a ) break;
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memset( &ent, 0, sizeof(ent) );
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ret = krb5_parse_name(context, a->a_vals[0].bv_val, &ent.principal);
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if ( ret ) break;
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krb5_get_pw_salt( context, ent.principal, &salt );
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krb5_free_principal( context, ent.principal );
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a = attr_find( e->e_attrs, ad_krb5Key );
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if ( !a ) break;
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ent.keys.len = 1;
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ent.keys.val = &ekey;
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decode_Key((unsigned char *) a->a_vals[0].bv_val,
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(size_t) a->a_vals[0].bv_len, &ent.keys.val[0], &l);
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if ( db->master_key_set )
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hdb_unseal_keys( context, db, &ent );
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krb5_string_to_key_salt( context, ekey.key.keytype, cred->bv_val,
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salt, &key );
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krb5_free_salt( context, salt );
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if ( memcmp( ekey.key.keyvalue.data, key.keyvalue.data,
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key.keyvalue.length ) == 0 ) rc = LUTIL_PASSWD_OK;
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krb5_free_keyblock_contents( context, &key );
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krb5_free_keyblock_contents( context, &ekey.key );
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} while(0);
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be_entry_release_r( op, e );
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return rc;
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}
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#endif /* DO_KRB5 */
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static int smbk5pwd_exop_passwd(
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Operation *op,
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SlapReply *rs )
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{
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int i, rc;
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req_pwdexop_s *qpw = &op->oq_pwdexop;
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Entry *e;
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Attribute *a;
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Modifications *ml;
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slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
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/* Not the operation we expected, pass it on... */
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if ( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) ) {
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return SLAP_CB_CONTINUE;
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}
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op->o_bd->bd_info = (BackendInfo *)on->on_info;
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rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &e );
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if ( rc != LDAP_SUCCESS ) return rc;
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#ifdef DO_KRB5
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/* Kerberos stuff */
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do {
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krb5_error_code ret;
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hdb_entry ent;
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struct berval *keys;
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int kvno;
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if ( !is_entry_objectclass(e, oc_krb5KDCEntry, 0 ) ) break;
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a = attr_find( e->e_attrs, ad_krb5PrincipalName );
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if ( !a ) break;
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memset( &ent, 0, sizeof(ent) );
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ret = krb5_parse_name(context, a->a_vals[0].bv_val, &ent.principal);
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if ( ret ) break;
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a = attr_find( e->e_attrs, ad_krb5KeyVersionNumber );
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if ( a ) {
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kvno = atoi(a->a_vals[0].bv_val);
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} else {
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/* shouldn't happen, this is a required attr */
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kvno = 0;
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}
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ret = _kadm5_set_keys(kadm_context, &ent, qpw->rs_new.bv_val);
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hdb_seal_keys(context, db, &ent);
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krb5_free_principal( context, ent.principal );
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keys = ch_malloc( (ent.keys.len + 1) * sizeof(struct berval));
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for (i = 0; i < ent.keys.len; i++) {
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unsigned char *buf;
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size_t len;
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ASN1_MALLOC_ENCODE(Key, buf, len, &ent.keys.val[i], &len, ret);
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if (ret != 0)
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break;
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keys[i].bv_val = buf;
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keys[i].bv_len = len;
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}
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keys[i].bv_val = NULL;
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keys[i].bv_len = 0;
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_kadm5_free_keys(kadm_context, ent.keys.len, ent.keys.val);
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if ( i != ent.keys.len ) {
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ber_bvarray_free( keys );
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break;
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}
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ml = ch_malloc(sizeof(Modifications));
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if (!qpw->rs_modtail) qpw->rs_modtail = &ml->sml_next;
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ml->sml_next = qpw->rs_mods;
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qpw->rs_mods = ml;
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ml->sml_desc = ad_krb5Key;
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ml->sml_op = LDAP_MOD_REPLACE;
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ml->sml_values = keys;
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ml->sml_nvalues = NULL;
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ml = ch_malloc(sizeof(Modifications));
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ml->sml_next = qpw->rs_mods;
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qpw->rs_mods = ml;
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ml->sml_desc = ad_krb5KeyVersionNumber;
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ml->sml_op = LDAP_MOD_REPLACE;
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ml->sml_values = ch_malloc( 2 * sizeof(struct berval));
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ml->sml_values[0].bv_val = ch_malloc( 64 );
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ml->sml_values[0].bv_len = sprintf(ml->sml_values[0].bv_val,
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"%d", kvno+1 );
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ml->sml_values[1].bv_val = NULL;
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ml->sml_values[1].bv_len = 0;
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ml->sml_nvalues = NULL;
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} while(0);
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#endif /* DO_KRB5 */
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#ifdef DO_SAMBA
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/* Samba stuff */
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if ( is_entry_objectclass(e, oc_sambaSamAccount, 0 ) ) {
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struct berval *keys;
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ber_len_t j,l;
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wchar_t *wcs, wc;
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char *c, *d;
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struct berval pwd;
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/* Expand incoming UTF8 string to UCS4 */
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l = ldap_utf8_chars(qpw->rs_new.bv_val);
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wcs = ch_malloc((l+1) * sizeof(wchar_t));
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ldap_x_utf8s_to_wcs( wcs, qpw->rs_new.bv_val, l );
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/* Truncate UCS4 to UCS2 */
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c = (char *)wcs;
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for (j=0; j<l; j++) {
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wc = wcs[j];
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*c++ = wc & 0xff;
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*c++ = (wc >> 8) & 0xff;
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}
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*c++ = 0;
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pwd.bv_val = (char *)wcs;
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pwd.bv_len = l * 2;
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ml = ch_malloc(sizeof(Modifications));
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if (!qpw->rs_modtail) qpw->rs_modtail = &ml->sml_next;
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ml->sml_next = qpw->rs_mods;
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qpw->rs_mods = ml;
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keys = ch_malloc( 2 * sizeof(struct berval) );
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keys[1].bv_val = NULL;
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keys[1].bv_len = 0;
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nthash( &pwd, keys );
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ml->sml_desc = ad_sambaNTPassword;
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ml->sml_op = LDAP_MOD_REPLACE;
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ml->sml_values = keys;
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ml->sml_nvalues = NULL;
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/* Truncate UCS2 to 8-bit ASCII */
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c = pwd.bv_val+1;
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d = pwd.bv_val+2;
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for (j=1; j<l; j++) {
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*c++ = *d++;
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d++;
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}
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ml = ch_malloc(sizeof(Modifications));
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ml->sml_next = qpw->rs_mods;
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qpw->rs_mods = ml;
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keys = ch_malloc( 2 * sizeof(struct berval) );
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keys[1].bv_val = NULL;
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keys[1].bv_len = 0;
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lmhash( &pwd, keys );
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ml->sml_desc = ad_sambaLMPassword;
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ml->sml_op = LDAP_MOD_REPLACE;
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ml->sml_values = keys;
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ml->sml_nvalues = NULL;
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ch_free(wcs);
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ml = ch_malloc(sizeof(Modifications));
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ml->sml_next = qpw->rs_mods;
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qpw->rs_mods = ml;
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keys = ch_malloc( 2 * sizeof(struct berval) );
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keys[1].bv_val = NULL;
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keys[1].bv_len = 0;
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keys[0].bv_val = ch_malloc(16);
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keys[0].bv_len = sprintf(keys[0].bv_val, "%d",
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slap_get_time());
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ml->sml_desc = ad_sambaPwdLastSet;
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ml->sml_op = LDAP_MOD_REPLACE;
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ml->sml_values = keys;
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ml->sml_nvalues = NULL;
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}
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#endif /* DO_SAMBA */
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be_entry_release_r( op, e );
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return SLAP_CB_CONTINUE;
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}
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static slap_overinst smbk5pwd;
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int smbk5pwd_init() {
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int rc;
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const char *text;
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#ifdef DO_KRB5
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krb5_error_code ret;
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extern HDB * _kadm5_s_get_db(void *);
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/* Make sure all of our necessary schema items are loaded */
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oc_krb5KDCEntry = oc_find("krb5KDCEntry");
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if ( !oc_krb5KDCEntry ) return -1;
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rc = slap_str2ad( "krb5Key", &ad_krb5Key, &text );
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if ( rc ) return rc;
|
|
rc = slap_str2ad( "krb5KeyVersionNumber", &ad_krb5KeyVersionNumber, &text );
|
|
if ( rc ) return rc;
|
|
rc = slap_str2ad( "krb5PrincipalName", &ad_krb5PrincipalName, &text );
|
|
if ( rc ) return rc;
|
|
|
|
/* Initialize Kerberos context */
|
|
ret = krb5_init_context(&context);
|
|
if (ret) {
|
|
return -1;
|
|
}
|
|
|
|
ret = kadm5_s_init_with_password_ctx( context,
|
|
KADM5_ADMIN_SERVICE,
|
|
NULL,
|
|
KADM5_ADMIN_SERVICE,
|
|
&conf, 0, 0, &kadm_context );
|
|
|
|
db = _kadm5_s_get_db(kadm_context);
|
|
#endif /* DO_KRB5 */
|
|
|
|
#ifdef DO_SAMBA
|
|
oc_sambaSamAccount = oc_find("sambaSamAccount");
|
|
if ( !oc_sambaSamAccount ) return -1;
|
|
|
|
rc = slap_str2ad( "sambaLMPassword", &ad_sambaLMPassword, &text );
|
|
if ( rc ) return rc;
|
|
rc = slap_str2ad( "sambaNTPassword", &ad_sambaNTPassword, &text );
|
|
if ( rc ) return rc;
|
|
rc = slap_str2ad( "sambaPwdLastSet", &ad_sambaPwdLastSet, &text );
|
|
if ( rc ) return rc;
|
|
#endif /* DO_SAMBA */
|
|
|
|
smbk5pwd.on_bi.bi_type = "smbk5pwd";
|
|
smbk5pwd.on_bi.bi_extended = smbk5pwd_exop_passwd;
|
|
|
|
#ifdef DO_KRB5
|
|
smbk5pwd.on_bi.bi_op_bind = smbk5pwd_op_bind;
|
|
|
|
lutil_passwd_add( (struct berval *)&scheme, chk_k5key, NULL );
|
|
#endif
|
|
|
|
return overlay_register( &smbk5pwd );
|
|
}
|
|
|
|
#if SLAPD_OVER_SMBK5PWD == SLAPD_MOD_DYNAMIC
|
|
int init_module(int argc, char *argv[]) {
|
|
return smbk5pwd_init();
|
|
}
|
|
#endif
|
|
|
|
#endif /* defined(SLAPD_OVER_SMBK5PWD) */
|