1 files changed, 657 insertions, 0 deletions

diff --git a/servers/slapd/passwd.c b/servers/slapd/passwd.c
new file mode 100644
index 0000000..eef5b09
--- /dev/null
+++ b/servers/slapd/passwd.c
@@ -0,0 +1,657 @@
+/* passwd.c - password extended operation routines */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 The OpenLDAP Foundation.
+ * 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>.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/socket.h>
+#include <ac/string.h>
+#include <ac/unistd.h>
+
+#ifdef SLAPD_CRYPT
+#ifdef HAVE_CRYPT_R
+#define __USE_GNU
+#endif /* HAVE_CRYPT_R */
+#include <ac/crypt.h>
+#endif /* SLAPD_CRYPT */
+
+#include "slap.h"
+
+#include <lber_pvt.h>
+#include <lutil.h>
+#include <lutil_sha1.h>
+
+const struct berval slap_EXOP_MODIFY_PASSWD = BER_BVC(LDAP_EXOP_MODIFY_PASSWD);
+
+static const char *defhash[] = {
+#ifdef LUTIL_SHA1_BYTES
+	"{SSHA}",
+#else
+	"{SMD5}",
+#endif
+	NULL
+};
+
+int passwd_extop(
+	Operation *op,
+	SlapReply *rs )
+{
+	struct berval id = {0, NULL}, hash, *rsp = NULL;
+	req_pwdexop_s *qpw = &op->oq_pwdexop;
+	req_extended_s qext = op->oq_extended;
+	Modifications *ml;
+	slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
+	int i, nhash;
+	char **hashes, idNul;
+	int rc;
+	BackendDB *op_be;
+	int freenewpw = 0;
+	struct berval dn = BER_BVNULL, ndn = BER_BVNULL;
+
+	assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
+
+	if( op->o_dn.bv_len == 0 ) {
+		Debug( LDAP_DEBUG_STATS, "%s PASSMOD\n",
+			op->o_log_prefix );
+		rs->sr_text = "only authenticated users may change passwords";
+		return LDAP_STRONG_AUTH_REQUIRED;
+	}
+
+	qpw->rs_old.bv_len = 0;
+	qpw->rs_old.bv_val = NULL;
+	qpw->rs_new.bv_len = 0;
+	qpw->rs_new.bv_val = NULL;
+	qpw->rs_mods = NULL;
+	qpw->rs_modtail = NULL;
+
+	rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id,
+		&qpw->rs_old, &qpw->rs_new, &rs->sr_text );
+
+	if ( !BER_BVISNULL( &id )) {
+		idNul = id.bv_val[id.bv_len];
+		id.bv_val[id.bv_len] = '\0';
+	}
+	if ( rs->sr_err == LDAP_SUCCESS && !BER_BVISEMPTY( &id ) ) {
+		Debug( LDAP_DEBUG_STATS, "%s PASSMOD id=\"%s\"%s%s\n",
+			op->o_log_prefix, id.bv_val,
+			qpw->rs_old.bv_val ? " old" : "",
+			qpw->rs_new.bv_val ? " new" : "" );
+	} else {
+		Debug( LDAP_DEBUG_STATS, "%s PASSMOD%s%s\n",
+			op->o_log_prefix,
+			qpw->rs_old.bv_val ? " old" : "",
+			qpw->rs_new.bv_val ? " new" : "" );
+	}
+
+	if ( rs->sr_err != LDAP_SUCCESS ) {
+		if ( !BER_BVISNULL( &id ))
+			id.bv_val[id.bv_len] = idNul;
+		return rs->sr_err;
+	}
+
+	if ( !BER_BVISEMPTY( &id ) ) {
+		rs->sr_err = dnPrettyNormal( NULL, &id, &dn, &ndn, op->o_tmpmemctx );
+		id.bv_val[id.bv_len] = idNul;
+		if ( rs->sr_err != LDAP_SUCCESS ) {
+			rs->sr_text = "Invalid DN";
+			rc = rs->sr_err;
+			goto error_return;
+		}
+		op->o_req_dn = dn;
+		op->o_req_ndn = ndn;
+		op->o_bd = select_backend( &op->o_req_ndn, 1 );
+
+	} else {
+		ber_dupbv_x( &dn, &op->o_dn, op->o_tmpmemctx );
+		ber_dupbv_x( &ndn, &op->o_ndn, op->o_tmpmemctx );
+		op->o_req_dn = dn;
+		op->o_req_ndn = ndn;
+		ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+		op->o_bd = op->o_conn->c_authz_backend;
+		ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+	}
+
+	if( op->o_bd == NULL ) {
+		if ( qpw->rs_old.bv_val != NULL ) {
+			rs->sr_text = "unwilling to verify old password";
+			rc = LDAP_UNWILLING_TO_PERFORM;
+			goto error_return;
+		}
+
+#ifdef HAVE_CYRUS_SASL
+		rc = slap_sasl_setpass( op, rs );
+#else
+		rs->sr_text = "no authz backend";
+		rc = LDAP_OTHER;
+#endif
+		goto error_return;
+	}
+
+	if ( op->o_req_ndn.bv_len == 0 ) {
+		rs->sr_text = "no password is associated with the Root DSE";
+		rc = LDAP_UNWILLING_TO_PERFORM;
+		goto error_return;
+	}
+
+	/* If we've got a glued backend, check the real backend */
+	op_be = op->o_bd;
+	if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
+		op->o_bd = select_backend( &op->o_req_ndn, 0 );
+	}
+
+	if (backend_check_restrictions( op, rs,
+			(struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
+		rc = rs->sr_err;
+		goto error_return;
+	}
+
+	/* check for referrals */
+	if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
+		rc = rs->sr_err;
+		goto error_return;
+	}
+
+	/* This does not apply to multi-provider case */
+	if(!( !SLAP_SINGLE_SHADOW( op->o_bd ) || be_isupdate( op ))) {
+		/* we SHOULD return a referral in this case */
+		BerVarray defref = op->o_bd->be_update_refs
+			? op->o_bd->be_update_refs : default_referral; 
+
+		if( defref != NULL ) {
+			rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
+				NULL, NULL, LDAP_SCOPE_DEFAULT );
+			if(rs->sr_ref) {
+				rs->sr_flags |= REP_REF_MUSTBEFREED;
+			} else {
+				rs->sr_ref = defref;
+			}
+			rc = LDAP_REFERRAL;
+			goto error_return;
+
+		}
+
+		rs->sr_text = "shadow context; no update referral";
+		rc = LDAP_UNWILLING_TO_PERFORM;
+		goto error_return;
+	}
+
+	/* generate a new password if none was provided */
+	if ( qpw->rs_new.bv_len == 0 ) {
+		slap_passwd_generate( &qpw->rs_new );
+		if ( qpw->rs_new.bv_len ) {
+			rsp = slap_passwd_return( &qpw->rs_new );
+			freenewpw = 1;
+		}
+	}
+	if ( qpw->rs_new.bv_len == 0 ) {
+		rs->sr_text = "password generation failed";
+		rc = LDAP_OTHER;
+		goto error_return;
+	}
+
+	if ( op->o_txnSpec ) {
+		rc = txn_preop( op, rs );
+		goto error_return;
+	}
+
+	op->o_bd = op_be;
+
+	/* Give the backend a chance to handle this itself */
+	if ( op->o_bd->be_extended ) {
+		rs->sr_err = op->o_bd->be_extended( op, rs );
+		if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
+			rs->sr_err != SLAP_CB_CONTINUE )
+		{
+			rc = rs->sr_err;
+			if ( rsp ) {
+				rs->sr_rspdata = rsp;
+				rsp = NULL;
+			}
+			goto error_return;
+		}
+	}
+
+	/* The backend didn't handle it, so try it here */
+	if( op->o_bd && !op->o_bd->be_modify ) {
+		rs->sr_text = "operation not supported for current user";
+		rc = LDAP_UNWILLING_TO_PERFORM;
+		goto error_return;
+	}
+
+	if ( qpw->rs_old.bv_val != NULL ) {
+		Entry *e = NULL;
+
+		rc = be_entry_get_rw( op, &op->o_req_ndn, NULL,
+			slap_schema.si_ad_userPassword, 0, &e );
+		if ( rc == LDAP_SUCCESS && e ) {
+			Attribute *a = attr_find( e->e_attrs,
+				slap_schema.si_ad_userPassword );
+			if ( a )
+				rc = slap_passwd_check( op, e, a, &qpw->rs_old, &rs->sr_text );
+			else
+				rc = 1;
+			be_entry_release_r( op, e );
+			if ( rc == LDAP_SUCCESS )
+				goto old_good;
+		}
+		rs->sr_text = "unwilling to verify old password";
+		rc = LDAP_UNWILLING_TO_PERFORM;
+		goto error_return;
+	}
+
+old_good:
+	ml = ch_malloc( sizeof(Modifications) );
+	if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
+
+	if ( default_passwd_hash ) {
+		for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
+		hashes = default_passwd_hash;
+	} else {
+		nhash = 1;
+		hashes = (char **)defhash;
+	}
+	ml->sml_numvals = nhash;
+	ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
+	for ( i=0; hashes[i]; i++ ) {
+		slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
+		if ( hash.bv_len == 0 ) {
+			if ( !rs->sr_text ) {
+				rs->sr_text = "password hash failed";
+			}
+			break;
+		}
+		ml->sml_values[i] = hash;
+	}
+	ml->sml_values[i].bv_val = NULL;
+	ml->sml_nvalues = NULL;
+	ml->sml_desc = slap_schema.si_ad_userPassword;
+	ml->sml_type = ml->sml_desc->ad_cname;
+	ml->sml_op = LDAP_MOD_REPLACE;
+	ml->sml_flags = 0;
+	ml->sml_next = qpw->rs_mods;
+	qpw->rs_mods = ml;
+
+	if ( hashes[i] ) {
+		rs->sr_err = LDAP_OTHER;
+
+	} else {
+		slap_callback **sc;
+
+		op->o_tag = LDAP_REQ_MODIFY;
+		op->o_callback = &cb;
+		op->orm_modlist = qpw->rs_mods;
+		op->orm_no_opattrs = 0;
+		
+		cb.sc_private = qpw;	/* let Modify know this was pwdMod,
+					 * if it cares... */
+
+		rs->sr_err = op->o_bd->be_modify( op, rs );
+
+		/* be_modify() might have shuffled modifications */
+		qpw->rs_mods = op->orm_modlist;
+
+		if ( rs->sr_err == LDAP_SUCCESS ) {
+			rs->sr_rspdata = rsp;
+
+		} else if ( rsp ) {
+			ber_bvfree( rsp );
+			rsp = NULL;
+		}
+		op->o_tag = LDAP_REQ_EXTENDED;
+		for ( sc = &op->o_callback; *sc; sc = &(*sc)->sc_next ) {
+			if ( *sc == &cb ) {
+				*sc = cb.sc_next;
+				break;
+			}
+		}
+	}
+
+	rc = rs->sr_err;
+	op->oq_extended = qext;
+
+error_return:;
+	if ( qpw->rs_mods ) {
+		slap_mods_free( qpw->rs_mods, 1 );
+	}
+	if ( freenewpw ) {
+		free( qpw->rs_new.bv_val );
+	}
+	if ( !BER_BVISNULL( &dn ) ) {
+		op->o_tmpfree( dn.bv_val, op->o_tmpmemctx );
+		BER_BVZERO( &op->o_req_dn );
+	}
+	if ( !BER_BVISNULL( &ndn ) ) {
+		op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx );
+		BER_BVZERO( &op->o_req_ndn );
+	}
+
+	return rc;
+}
+
+/* NOTE: The DN in *id is NOT NUL-terminated here. dnNormalize will
+ * reject it in this condition, the caller must NUL-terminate it.
+ * FIXME: should dnNormalize still be complaining about that?
+ */
+int slap_passwd_parse( struct berval *reqdata,
+	struct berval *id,
+	struct berval *oldpass,
+	struct berval *newpass,
+	const char **text )
+{
+	int rc = LDAP_SUCCESS;
+	ber_tag_t tag;
+	ber_len_t len = -1;
+	BerElementBuffer berbuf;
+	BerElement *ber = (BerElement *)&berbuf;
+
+	if( reqdata == NULL ) {
+		return LDAP_SUCCESS;
+	}
+
+	if( reqdata->bv_len == 0 ) {
+		*text = "empty request data field";
+		return LDAP_PROTOCOL_ERROR;
+	}
+
+	/* ber_init2 uses reqdata directly, doesn't allocate new buffers */
+	ber_init2( ber, reqdata, 0 );
+
+	tag = ber_skip_tag( ber, &len );
+
+	if( tag != LBER_SEQUENCE ) {
+		Debug( LDAP_DEBUG_TRACE,
+			"slap_passwd_parse: decoding error\n" );
+		rc = LDAP_PROTOCOL_ERROR;
+		goto done;
+	}
+
+	tag = ber_peek_tag( ber, &len );
+	if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
+		if( id == NULL ) {
+			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n" );
+
+			*text = "user must change own password";
+			rc = LDAP_UNWILLING_TO_PERFORM;
+			goto done;
+		}
+
+		tag = ber_get_stringbv( ber, id, LBER_BV_NOTERM );
+
+		if( tag == LBER_ERROR ) {
+			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n" );
+
+			goto decoding_error;
+		}
+
+		tag = ber_peek_tag( ber, &len );
+	}
+
+	if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
+		if( oldpass == NULL ) {
+			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n" );
+
+			*text = "use bind to verify old password";
+			rc = LDAP_UNWILLING_TO_PERFORM;
+			goto done;
+		}
+
+		tag = ber_get_stringbv( ber, oldpass, LBER_BV_NOTERM );
+
+		if( tag == LBER_ERROR ) {
+			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n" );
+
+			goto decoding_error;
+		}
+
+		if( oldpass->bv_len == 0 ) {
+			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n" );
+
+			*text = "old password value is empty";
+			rc = LDAP_UNWILLING_TO_PERFORM;
+			goto done;
+		}
+
+		tag = ber_peek_tag( ber, &len );
+	}
+
+	if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
+		if( newpass == NULL ) {
+			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n" );
+
+			*text = "user specified passwords disallowed";
+			rc = LDAP_UNWILLING_TO_PERFORM;
+			goto done;
+		}
+
+		tag = ber_get_stringbv( ber, newpass, LBER_BV_NOTERM );
+
+		if( tag == LBER_ERROR ) {
+			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n" );
+
+			goto decoding_error;
+		}
+
+		if( newpass->bv_len == 0 ) {
+			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n" );
+
+			*text = "new password value is empty";
+			rc = LDAP_UNWILLING_TO_PERFORM;
+			goto done;
+		}
+
+		tag = ber_peek_tag( ber, &len );
+	}
+
+	if( len != 0 ) {
+decoding_error:
+		Debug( LDAP_DEBUG_TRACE,
+			"slap_passwd_parse: decoding error, len=%ld\n",
+			(long) len );
+
+		*text = "data decoding error";
+		rc = LDAP_PROTOCOL_ERROR;
+	}
+
+done:
+	return rc;
+}
+
+struct berval * slap_passwd_return(
+	struct berval		*cred )
+{
+	int rc;
+	struct berval *bv = NULL;
+	BerElementBuffer berbuf;
+	/* opaque structure, size unknown but smaller than berbuf */
+	BerElement *ber = (BerElement *)&berbuf;
+
+	assert( cred != NULL );
+
+	Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
+		(long) cred->bv_len );
+	
+	ber_init_w_nullc( ber, LBER_USE_DER );
+
+	rc = ber_printf( ber, "{tON}",
+		LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
+
+	if( rc >= 0 ) {
+		(void) ber_flatten( ber, &bv );
+	}
+
+	ber_free_buf( ber );
+
+	return bv;
+}
+
+/*
+ * if "e" is provided, access to each value of the password is checked first
+ */
+int
+slap_passwd_check(
+	Operation	*op,
+	Entry		*e,
+	Attribute	*a,
+	struct berval	*cred,
+	const char	**text )
+{
+	int			result = 1;
+	struct berval		*bv;
+	AccessControlState	acl_state = ACL_STATE_INIT;
+	char		credNul = cred->bv_val[cred->bv_len];
+
+#ifdef SLAPD_SPASSWD
+	void		*old_authctx = NULL;
+
+	ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind,
+		op->o_conn->c_sasl_authctx, 0, &old_authctx, NULL );
+#endif
+
+	if ( credNul ) cred->bv_val[cred->bv_len] = 0;
+
+	for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
+		/* if e is provided, check access */
+		if ( e && access_allowed( op, e, a->a_desc, bv,
+					ACL_AUTH, &acl_state ) == 0 )
+		{
+			continue;
+		}
+		
+		if ( !lutil_passwd( bv, cred, NULL, text ) ) {
+			result = 0;
+			break;
+		}
+	}
+
+	if ( credNul ) cred->bv_val[cred->bv_len] = credNul;
+
+#ifdef SLAPD_SPASSWD
+	ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind,
+		old_authctx, 0, NULL, NULL );
+#endif
+
+	return result;
+}
+
+void
+slap_passwd_generate( struct berval *pass )
+{
+	Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n" );
+	BER_BVZERO( pass );
+
+	/*
+	 * generate passwords of only 8 characters as some getpass(3)
+	 * implementations truncate at 8 characters.
+	 */
+	lutil_passwd_generate( pass, 8 );
+}
+
+void
+slap_passwd_hash_type(
+	struct berval * cred,
+	struct berval * new,
+	char *hash,
+	const char **text )
+{
+	new->bv_len = 0;
+	new->bv_val = NULL;
+
+	assert( hash != NULL );
+
+	lutil_passwd_hash( cred , hash, new, text );
+}
+void
+slap_passwd_hash(
+	struct berval * cred,
+	struct berval * new,
+	const char **text )
+{
+	char *hash = NULL;
+	if ( default_passwd_hash ) {
+		hash = default_passwd_hash[0];
+	}
+	if ( !hash ) {
+		hash = (char *)defhash[0];
+	}
+
+	slap_passwd_hash_type( cred, new, hash, text );
+}
+
+#ifdef SLAPD_CRYPT
+static ldap_pvt_thread_mutex_t passwd_mutex;
+static lutil_cryptfunc slapd_crypt;
+
+#ifdef HAVE_CRYPT_R
+static int slapd_crypt( const char *key, const char *salt, char **hash )
+{
+	char *cr;
+	int rc;
+	struct crypt_data data;
+
+	data.initialized = 0;
+	cr = crypt_r( key, salt, &data );
+	if ( cr == NULL || cr[0] == '\0' ) {
+		/* salt must have been invalid */
+		rc = LUTIL_PASSWD_ERR;
+	} else {
+		if ( hash ) {
+			*hash = ber_strdup( cr );
+			rc = LUTIL_PASSWD_OK;
+		} else {
+			rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
+		}
+	}
+
+    return rc;
+}
+#else
+static int slapd_crypt( const char *key, const char *salt, char **hash )
+{
+	char *cr;
+	int rc;
+
+	ldap_pvt_thread_mutex_lock( &passwd_mutex );
+
+	cr = crypt( key, salt );
+	if ( cr == NULL || cr[0] == '\0' ) {
+		/* salt must have been invalid */
+		rc = LUTIL_PASSWD_ERR;
+	} else {
+		if ( hash ) {
+			*hash = ber_strdup( cr );
+			rc = LUTIL_PASSWD_OK;
+
+		} else {
+			rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
+		}
+	}
+
+	ldap_pvt_thread_mutex_unlock( &passwd_mutex );
+	return rc;
+}
+#endif /* HAVE_CRYPT_R */
+
+#endif /* SLAPD_CRYPT */
+
+void slap_passwd_init()
+{
+#ifdef SLAPD_CRYPT
+	ldap_pvt_thread_mutex_init( &passwd_mutex );
+	lutil_cryptptr = slapd_crypt;
+#endif
+}
+