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[] = {
35 BerElement *ber = op->o_ber;
41 int rc = LDAP_SUCCESS;
45 Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
52 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
54 /* Force to connection to "anonymous" until bind succeeds.
55 * This may need to be relocated or done on a case by case basis
56 * to handle certain SASL mechanisms.
59 if ( conn->c_cdn != NULL ) {
64 if ( conn->c_dn != NULL ) {
69 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
71 if ( op->o_dn != NULL ) {
73 op->o_dn = ch_strdup( "" );
76 if ( op->o_ndn != NULL ) {
78 op->o_ndn = ch_strdup( "" );
82 * Parse the bind request. It looks like this:
84 * BindRequest ::= SEQUENCE {
85 * version INTEGER, -- version
86 * name DistinguishedName, -- dn
87 * authentication CHOICE {
88 * simple [0] OCTET STRING -- passwd
89 * krbv42ldap [1] OCTET STRING
90 * krbv42dsa [2] OCTET STRING
91 * SASL [3] SaslCredentials
95 * SaslCredentials ::= SEQUENCE {
96 * mechanism LDAPString,
97 * credentials OCTET STRING OPTIONAL
101 tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
103 if ( tag == LBER_ERROR ) {
104 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
105 send_ldap_disconnect( conn, op,
106 LDAP_PROTOCOL_ERROR, "decoding error" );
111 ndn = ch_strdup( dn );
113 if ( dn_normalize_case( ndn ) == NULL ) {
114 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
115 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
116 "invalid DN", NULL, NULL );
120 op->o_protocol = version;
122 if( method != LDAP_AUTH_SASL ) {
123 tag = ber_scanf( ber, /*{*/ "o}", &cred );
126 tag = ber_scanf( ber, "{a" /*}*/, &mech );
128 if ( tag != LBER_ERROR ) {
130 tag = ber_peek_tag( ber, &len );
132 if ( tag == LDAP_TAG_LDAPCRED ) {
133 tag = ber_scanf( ber, "o", &cred );
136 if ( tag != LBER_ERROR ) {
137 tag = ber_scanf( ber, /*{{*/ "}}" );
142 if ( tag == LBER_ERROR ) {
143 send_ldap_disconnect( conn, op,
150 if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
151 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
155 if( method == LDAP_AUTH_SASL ) {
156 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
159 Debug( LDAP_DEBUG_TRACE, "do_bind: version %d dn (%s) method %d\n",
160 version, dn, method );
163 Statslog( LDAP_DEBUG_STATS, "conn=%d op=%d BIND dn=\"%s\" method=%d\n",
164 op->o_connid, op->o_opid, ndn, method, 0 );
166 if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
167 Debug( LDAP_DEBUG_ANY, "unknown version %d\n", version, 0, 0 );
168 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
169 NULL, "version not supported", NULL, NULL );
173 if ( method == LDAP_AUTH_SASL ) {
174 if ( version < LDAP_VERSION3 ) {
175 Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%d\n",
177 send_ldap_disconnect( conn, op,
178 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
183 if( mech == NULL || *mech == '\0' ) {
184 Debug( LDAP_DEBUG_ANY,
185 "do_bind: no sasl mechanism provided\n",
187 send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
188 NULL, "no sasl mechanism provided", NULL, NULL );
192 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
193 Debug( LDAP_DEBUG_ANY,
194 "do_bind: sasl mechanism \"%s\" not supported.\n",
196 send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
197 NULL, "sasl mechanism not supported", NULL, NULL );
201 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
203 if ( conn->c_authmech != NULL ) {
204 assert( conn->c_bind_in_progress );
206 if((strcmp(conn->c_authmech, mech) != 0)) {
207 /* mechanism changed, cancel in progress bind */
208 conn->c_bind_in_progress = 0;
209 if( conn->c_authstate != NULL ) {
210 free(conn->c_authstate);
211 conn->c_authstate = NULL;
213 free(conn->c_authmech);
214 conn->c_authmech = NULL;
219 assert( !conn->c_bind_in_progress );
220 assert( conn->c_authmech == NULL );
221 assert( conn->c_authstate == NULL );
226 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
228 if ( conn->c_authmech != NULL ) {
229 assert( conn->c_bind_in_progress );
231 /* cancel in progress bind */
232 conn->c_bind_in_progress = 0;
234 if( conn->c_authstate != NULL ) {
235 free(conn->c_authstate);
236 conn->c_authstate = NULL;
238 free(conn->c_authmech);
239 conn->c_authmech = NULL;
243 conn->c_protocol = version;
244 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
246 /* accept null binds */
247 if ( ndn == NULL || *ndn == '\0' ) {
249 * we already forced connection to "anonymous", we just
250 * need to send success
252 send_ldap_result( conn, op, LDAP_SUCCESS,
253 NULL, NULL, NULL, NULL );
258 * We could be serving multiple database backends. Select the
259 * appropriate one, or send a referral to our "referral server"
260 * if we don't hold it.
263 if ( (be = select_backend( ndn )) == NULL ) {
264 if ( cred.bv_len == 0 ) {
265 send_ldap_result( conn, op, LDAP_SUCCESS,
266 NULL, NULL, NULL, NULL );
268 } else if ( default_referral ) {
269 send_ldap_result( conn, op, rc = LDAP_REFERRAL,
270 NULL, NULL, default_referral, NULL );
273 send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
274 NULL, NULL, NULL, NULL );
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 ) {