1 /* bind.c - decode an ldap bind operation and pass it to a backend db */
4 * Copyright (c) 1995 Regents of the University of Michigan.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that this notice is preserved and that due credit is given
9 * to the University of Michigan at Ann Arbor. The name of the University
10 * may not be used to endorse or promote products derived from this
11 * software without specific prior written permission. This software
12 * is provided ``as is'' without express or implied warranty.
19 #include <ac/string.h>
20 #include <ac/socket.h>
24 char **supportedSASLMechanisms = NULL;
32 BerElement *ber = op->o_ber;
38 int rc = LDAP_SUCCESS;
42 Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
49 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
51 /* Force to connection to "anonymous" until bind succeeds.
52 * This may need to be relocated or done on a case by case basis
53 * to handle certain SASL mechanisms.
56 if ( conn->c_cdn != NULL ) {
61 if ( conn->c_dn != NULL ) {
66 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
68 if ( op->o_dn != NULL ) {
70 op->o_dn = ch_strdup( "" );
73 if ( op->o_ndn != NULL ) {
75 op->o_ndn = ch_strdup( "" );
79 * Parse the bind request. It looks like this:
81 * BindRequest ::= SEQUENCE {
82 * version INTEGER, -- version
83 * name DistinguishedName, -- dn
84 * authentication CHOICE {
85 * simple [0] OCTET STRING -- passwd
86 * krbv42ldap [1] OCTET STRING
87 * krbv42dsa [2] OCTET STRING
88 * SASL [3] SaslCredentials
92 * SaslCredentials ::= SEQUENCE {
93 * mechanism LDAPString,
94 * credentials OCTET STRING OPTIONAL
98 tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
100 if ( tag == LBER_ERROR ) {
101 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
102 send_ldap_disconnect( conn, op,
103 LDAP_PROTOCOL_ERROR, "decoding error" );
108 ndn = ch_strdup( dn );
110 if ( dn_normalize_case( ndn ) == NULL ) {
111 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
112 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
113 "invalid DN", NULL, NULL );
117 op->o_protocol = version;
119 if( method != LDAP_AUTH_SASL ) {
120 tag = ber_scanf( ber, /*{*/ "o}", &cred );
123 tag = ber_scanf( ber, "{a" /*}*/, &mech );
125 if ( tag != LBER_ERROR ) {
127 tag = ber_peek_tag( ber, &len );
129 if ( tag == LDAP_TAG_LDAPCRED ) {
130 tag = ber_scanf( ber, "o", &cred );
133 if ( tag != LBER_ERROR ) {
134 tag = ber_scanf( ber, /*{{*/ "}}" );
139 if ( tag == LBER_ERROR ) {
140 send_ldap_disconnect( conn, op,
147 if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
148 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
152 if( method == LDAP_AUTH_SASL ) {
153 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
156 Debug( LDAP_DEBUG_TRACE, "do_bind: version %d dn (%s) method %d\n",
157 version, dn, method );
160 Statslog( LDAP_DEBUG_STATS, "conn=%d op=%d BIND dn=\"%s\" method=%d\n",
161 op->o_connid, op->o_opid, ndn, method, 0 );
163 if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
164 Debug( LDAP_DEBUG_ANY, "unknown version %d\n", version, 0, 0 );
165 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
166 NULL, "version not supported", NULL, NULL );
170 if ( method == LDAP_AUTH_SASL ) {
171 if ( version < LDAP_VERSION3 ) {
172 Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%d\n",
174 send_ldap_disconnect( conn, op,
175 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
180 if( mech == NULL || *mech == '\0' ) {
181 Debug( LDAP_DEBUG_ANY,
182 "do_bind: no sasl mechanism provided\n",
184 send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
185 NULL, "no sasl mechanism provided", NULL, NULL );
189 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
190 Debug( LDAP_DEBUG_ANY,
191 "do_bind: sasl mechanism \"%s\" not supported.\n",
193 send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
194 NULL, "sasl mechanism not supported", NULL, NULL );
198 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
200 if ( conn->c_authmech != NULL ) {
201 assert( conn->c_bind_in_progress );
203 if((strcmp(conn->c_authmech, mech) != 0)) {
204 /* mechanism changed, cancel in progress bind */
205 conn->c_bind_in_progress = 0;
206 if( conn->c_authstate != NULL ) {
207 free(conn->c_authstate);
208 conn->c_authstate = NULL;
210 free(conn->c_authmech);
211 conn->c_authmech = NULL;
216 assert( !conn->c_bind_in_progress );
217 assert( conn->c_authmech == NULL );
218 assert( conn->c_authstate == NULL );
223 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
225 if ( conn->c_authmech != NULL ) {
226 assert( conn->c_bind_in_progress );
228 /* cancel in progress bind */
229 conn->c_bind_in_progress = 0;
231 if( conn->c_authstate != NULL ) {
232 free(conn->c_authstate);
233 conn->c_authstate = NULL;
235 free(conn->c_authmech);
236 conn->c_authmech = NULL;
240 conn->c_protocol = version;
241 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
243 /* accept null binds */
244 if ( ndn == NULL || *ndn == '\0' ) {
246 * we already forced connection to "anonymous", we just
247 * need to send success
249 send_ldap_result( conn, op, LDAP_SUCCESS,
250 NULL, NULL, NULL, NULL );
255 * We could be serving multiple database backends. Select the
256 * appropriate one, or send a referral to our "referral server"
257 * if we don't hold it.
260 if ( (be = select_backend( ndn )) == NULL ) {
261 if ( cred.bv_len == 0 ) {
262 send_ldap_result( conn, op, LDAP_SUCCESS,
263 NULL, NULL, NULL, NULL );
265 } else if ( default_referral ) {
266 send_ldap_result( conn, op, rc = LDAP_REFERRAL,
267 NULL, NULL, default_referral, NULL );
270 send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
271 NULL, NULL, NULL, NULL );
281 /* deref suffix alias if appropriate */
282 ndn = suffix_alias( be, ndn );
284 if ( (*be->be_bind)( be, conn, op, ndn, method, mech, &cred, &edn ) == 0 ) {
285 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
297 Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
298 conn->c_cdn, conn->c_dn, method );
300 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
302 /* send this here to avoid a race condition */
303 send_ldap_result( conn, op, LDAP_SUCCESS,
304 NULL, NULL, NULL, NULL );
306 } else if (edn != NULL) {
311 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
312 NULL, "Function not implemented", NULL, NULL );
322 if ( mech != NULL ) {
325 if ( cred.bv_val != NULL ) {