Make ldap_require_cert work (not segfault).
[exim.git] / src / src / lookups / ldap.c
CommitLineData
0a49a7a4 1/* $Cambridge: exim/src/src/lookups/ldap.c,v 1.15 2009/11/16 19:50:38 nm4 Exp $ */
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2
3/*************************************************
4* Exim - an Internet mail transport agent *
5*************************************************/
6
0a49a7a4 7/* Copyright (c) University of Cambridge 1995 - 2009 */
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8/* See the file NOTICE for conditions of use and distribution. */
9
10/* Many thanks to Stuart Lynne for contributing the original code for this
11driver. Further contibutions from Michael Haardt, Brian Candler, Barry
12Pederson, Peter Savitch and Christian Kellner. Particular thanks to Brian for
13researching how to handle the different kinds of error. */
14
15
16#include "../exim.h"
17#include "lf_functions.h"
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18
19
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PH
20/* Include LDAP headers. The code below uses some "old" LDAP interfaces that
21are deprecated in OpenLDAP. I don't know their status in other LDAP
22implementations. LDAP_DEPRECATED causes their prototypes to be defined in
23ldap.h. */
24
25#define LDAP_DEPRECATED 1
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26
27#include <lber.h>
28#include <ldap.h>
29
30
31/* Annoyingly, the different LDAP libraries handle errors in different ways,
32and some other things too. There doesn't seem to be an automatic way of
33distinguishing between them. Local/Makefile should contain a setting of
34LDAP_LIB_TYPE, which in turn causes appropriate macros to be defined for the
35different kinds. Those that matter are:
36
37LDAP_LIB_NETSCAPE
38LDAP_LIB_SOLARIS with synonym LDAP_LIB_SOLARIS7
39LDAP_LIB_OPENLDAP2
40
41These others may be defined, but are in fact the default, so are not tested:
42
43LDAP_LIB_UMICHIGAN
44LDAP_LIB_OPENLDAP1
45*/
46
47#if defined(LDAP_LIB_SOLARIS7) && ! defined(LDAP_LIB_SOLARIS)
48#define LDAP_LIB_SOLARIS
49#endif
50
51
52/* Just in case LDAP_NO_LIMIT is not defined by some of these libraries. */
53
54#ifndef LDAP_NO_LIMIT
55#define LDAP_NO_LIMIT 0
56#endif
57
58
59/* Just in case LDAP_DEREF_NEVER is not defined */
60
61#ifndef LDAP_DEREF_NEVER
62#define LDAP_DEREF_NEVER 0
63#endif
64
65
0756eb3c
PH
66/* Four types of LDAP search are implemented */
67
68#define SEARCH_LDAP_MULTIPLE 0 /* Get attributes from multiple entries */
69#define SEARCH_LDAP_SINGLE 1 /* Get attributes from one entry only */
70#define SEARCH_LDAP_DN 2 /* Get just the DN from one entry */
71#define SEARCH_LDAP_AUTH 3 /* Just checking for authentication */
72
73/* In all 4 cases, the DN is left in $ldap_dn (which post-dates the
74SEARCH_LDAP_DN lookup). */
75
76
77/* Structure and anchor for caching connections. */
78
79typedef struct ldap_connection {
80 struct ldap_connection *next;
81 uschar *host;
82 uschar *user;
83 uschar *password;
84 BOOL bound;
85 int port;
86 LDAP *ld;
87} LDAP_CONNECTION;
88
89static LDAP_CONNECTION *ldap_connections = NULL;
90
91
92
93/*************************************************
94* Internal search function *
95*************************************************/
96
97/* This is the function that actually does the work. It is called (indirectly
98via control_ldap_search) from eldap_find(), eldapauth_find(), eldapdn_find(),
99and eldapm_find(), with a difference in the "search_type" argument.
100
101The case of eldapauth_find() is special in that all it does is do
102authentication, returning OK or FAIL as appropriate. This isn't used as a
103lookup. Instead, it is called from expand.c as an expansion condition test.
104
105The DN from a successful lookup is placed in $ldap_dn. This feature postdates
106the provision of the SEARCH_LDAP_DN facility for returning just the DN as the
107data.
108
109Arguments:
110 ldap_url the URL to be looked up
111 server server host name, when URL contains none
112 s_port server port, used when URL contains no name
113 search_type SEARCH_LDAP_MULTIPLE allows values from multiple entries
114 SEARCH_LDAP_SINGLE allows values from one entry only
115 SEARCH_LDAP_DN gets the DN from one entry
116 res set to point at the result (not used for ldapauth)
117 errmsg set to point a message if result is not OK
118 defer_break set TRUE if no more servers to be tried after a DEFER
119 user user name for authentication, or NULL
120 password password for authentication, or NULL
121 sizelimit max number of entries returned, or 0 for no limit
122 timelimit max time to wait, or 0 for no limit
d00328e2 123 tcplimit max time for network activity, e.g. connect, or 0 for OS default
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PH
124 deference the dereference option, which is one of
125 LDAP_DEREF_{NEVER,SEARCHING,FINDING,ALWAYS}
6ec97b1b 126 referrals the referral option, which is LDAP_OPT_ON or LDAP_OPT_OFF
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PH
127
128Returns: OK or FAIL or DEFER
129 FAIL is given only if a lookup was performed successfully, but
130 returned no data.
131*/
132
133static int
134perform_ldap_search(uschar *ldap_url, uschar *server, int s_port, int search_type,
135 uschar **res, uschar **errmsg, BOOL *defer_break, uschar *user, uschar *password,
6ec97b1b 136 int sizelimit, int timelimit, int tcplimit, int dereference, void *referrals)
0756eb3c
PH
137{
138LDAPURLDesc *ludp = NULL;
139LDAPMessage *result = NULL;
140BerElement *ber;
141LDAP_CONNECTION *lcp;
142
143struct timeval timeout;
144struct timeval *timeoutptr = NULL;
145
146uschar *attr;
147uschar **attrp;
148uschar *data = NULL;
149uschar *dn = NULL;
150uschar *host;
151uschar **values;
152uschar **firstval;
153uschar porttext[16];
154
155uschar *error1 = NULL; /* string representation of errcode (static) */
156uschar *error2 = NULL; /* error message from the server */
157uschar *matched = NULL; /* partially matched DN */
158
159int attr_count = 0;
160int error_yield = DEFER;
161int msgid;
d38f8232 162int rc, ldap_rc, ldap_parse_rc;
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PH
163int port;
164int ptr = 0;
165int rescount = 0;
166int size = 0;
167BOOL attribute_found = FALSE;
168BOOL ldapi = FALSE;
169
170DEBUG(D_lookup)
171 debug_printf("perform_ldap_search: ldap%s URL = \"%s\" server=%s port=%d "
172 "sizelimit=%d timelimit=%d tcplimit=%d\n",
173 (search_type == SEARCH_LDAP_MULTIPLE)? "m" :
174 (search_type == SEARCH_LDAP_DN)? "dn" :
175 (search_type == SEARCH_LDAP_AUTH)? "auth" : "",
176 ldap_url, server, s_port, sizelimit, timelimit, tcplimit);
177
178/* Check if LDAP thinks the URL is a valid LDAP URL. We assume that if the LDAP
179library that is in use doesn't recognize, say, "ldapi", it will barf here. */
180
181if (!ldap_is_ldap_url(CS ldap_url))
182 {
183 *errmsg = string_sprintf("ldap_is_ldap_url: not an LDAP url \"%s\"\n",
184 ldap_url);
185 goto RETURN_ERROR_BREAK;
186 }
187
188/* Parse the URL */
189
190if ((rc = ldap_url_parse(CS ldap_url, &ludp)) != 0)
191 {
192 *errmsg = string_sprintf("ldap_url_parse: (error %d) parsing \"%s\"\n", rc,
193 ldap_url);
194 goto RETURN_ERROR_BREAK;
195 }
196
197/* If the host name is empty, take it from the separate argument, if one is
198given. OpenLDAP 2.0.6 sets an unset hostname to "" rather than empty, but
199expects NULL later in ldap_init() to mean "default", annoyingly. In OpenLDAP
2002.0.11 this has changed (it uses NULL). */
201
202if ((ludp->lud_host == NULL || ludp->lud_host[0] == 0) && server != NULL)
203 {
204 host = server;
205 port = s_port;
206 }
207else
208 {
209 host = US ludp->lud_host;
210 if (host != NULL && host[0] == 0) host = NULL;
211 port = ludp->lud_port;
212 }
213
214DEBUG(D_lookup) debug_printf("after ldap_url_parse: host=%s port=%d\n",
215 host, port);
216
217if (port == 0) port = LDAP_PORT; /* Default if none given */
218sprintf(CS porttext, ":%d", port); /* For messages */
219
220/* If the "host name" is actually a path, we are going to connect using a Unix
221socket, regardless of whether "ldapi" was actually specified or not. This means
222that a Unix socket can be declared in eldap_default_servers, and "traditional"
223LDAP queries using just "ldap" can be used ("ldaps" is similarly overridden).
224The path may start with "/" or it may already be escaped as "%2F" if it was
225actually declared that way in eldap_default_servers. (I did it that way the
226first time.) If the host name is not a path, the use of "ldapi" causes an
227error, except in the default case. (But lud_scheme doesn't seem to exist in
228older libraries.) */
229
230if (host != NULL)
231 {
232 if ((host[0] == '/' || Ustrncmp(host, "%2F", 3) == 0))
233 {
234 ldapi = TRUE;
235 porttext[0] = 0; /* Remove port from messages */
236 }
237
238 #if defined LDAP_LIB_OPENLDAP2
239 else if (strncmp(ludp->lud_scheme, "ldapi", 5) == 0)
240 {
241 *errmsg = string_sprintf("ldapi requires an absolute path (\"%s\" given)",
242 host);
243 goto RETURN_ERROR;
244 }
245 #endif
246 }
247
248/* Count the attributes; we need this later to tell us how to format results */
249
250for (attrp = USS ludp->lud_attrs; attrp != NULL && *attrp != NULL; attrp++)
251 attr_count++;
252
253/* See if we can find a cached connection to this host. The port is not
254relevant for ldapi. The host name pointer is set to NULL if no host was given
255(implying the library default), rather than to the empty string. Note that in
256this case, there is no difference between ldap and ldapi. */
257
258for (lcp = ldap_connections; lcp != NULL; lcp = lcp->next)
259 {
260 if ((host == NULL) != (lcp->host == NULL) ||
261 (host != NULL && strcmpic(lcp->host, host) != 0))
262 continue;
263 if (ldapi || port == lcp->port) break;
264 }
265
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PH
266/* Use this network timeout in any requests. */
267
268if (tcplimit > 0)
269 {
270 timeout.tv_sec = tcplimit;
271 timeout.tv_usec = 0;
272 timeoutptr = &timeout;
273 }
274
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275/* If no cached connection found, we must open a connection to the server. If
276the server name is actually an absolute path, we set ldapi=TRUE above. This
277requests connection via a Unix socket. However, as far as I know, only OpenLDAP
278supports the use of sockets, and the use of ldap_initialize(). */
279
280if (lcp == NULL)
281 {
282 LDAP *ld;
283
284
285 /* --------------------------- OpenLDAP ------------------------ */
286
287 /* There seems to be a preference under OpenLDAP for ldap_initialize()
288 instead of ldap_init(), though I have as yet been unable to find
289 documentation that says this. (OpenLDAP documentation is sparse to
290 non-existent). So we handle OpenLDAP differently here. Also, support for
291 ldapi seems to be OpenLDAP-only at present. */
292
293 #ifdef LDAP_LIB_OPENLDAP2
294
295 /* We now need an empty string for the default host. Get some store in which
296 to build a URL for ldap_initialize(). In the ldapi case, it can't be bigger
297 than (9 + 3*Ustrlen(shost)), whereas in the other cases it can't be bigger
298 than the host name + "ldaps:///" plus : and a port number, say 20 + the
299 length of the host name. What we get should accommodate both, easily. */
300
301 uschar *shost = (host == NULL)? US"" : host;
302 uschar *init_url = store_get(20 + 3 * Ustrlen(shost));
303 uschar *init_ptr;
304
305 /* Handle connection via Unix socket ("ldapi"). We build a basic LDAP URI to
306 contain the path name, with slashes escaped as %2F. */
307
308 if (ldapi)
309 {
310 int ch;
311 init_ptr = init_url + 8;
312 Ustrcpy(init_url, "ldapi://");
313 while ((ch = *shost++) != 0)
314 {
315 if (ch == '/')
316 {
317 Ustrncpy(init_ptr, "%2F", 3);
318 init_ptr += 3;
319 }
320 else *init_ptr++ = ch;
321 }
322 *init_ptr = 0;
323 }
324
325 /* This is not an ldapi call. Just build a URI with the protocol type, host
326 name, and port. */
327
328 else
329 {
330 init_ptr = Ustrchr(ldap_url, '/');
331 Ustrncpy(init_url, ldap_url, init_ptr - ldap_url);
332 init_ptr = init_url + (init_ptr - ldap_url);
333 sprintf(CS init_ptr, "//%s:%d/", shost, port);
334 }
335
336 /* Call ldap_initialize() and check the result */
337
338 DEBUG(D_lookup) debug_printf("ldap_initialize with URL %s\n", init_url);
339 rc = ldap_initialize(&ld, CS init_url);
340 if (rc != LDAP_SUCCESS)
341 {
342 *errmsg = string_sprintf("ldap_initialize: (error %d) URL \"%s\"\n",
343 rc, init_url);
344 goto RETURN_ERROR;
345 }
346 store_reset(init_url); /* Might as well save memory when we can */
347
348
349 /* ------------------------- Not OpenLDAP ---------------------- */
350
351 /* For libraries other than OpenLDAP, use ldap_init(). */
352
353 #else /* LDAP_LIB_OPENLDAP2 */
354 ld = ldap_init(CS host, port);
355 #endif /* LDAP_LIB_OPENLDAP2 */
356
357 /* -------------------------------------------------------------- */
358
359
360 /* Handle failure to initialize */
361
362 if (ld == NULL)
363 {
364 *errmsg = string_sprintf("failed to initialize for LDAP server %s%s - %s",
365 host, porttext, strerror(errno));
366 goto RETURN_ERROR;
367 }
368
369 /* Set the TCP connect time limit if available. This is something that is
370 in Netscape SDK v4.1; I don't know about other libraries. */
371
372 #ifdef LDAP_X_OPT_CONNECT_TIMEOUT
7c7ad977
PH
373 if (tcplimit > 0)
374 {
994a09e9 375 int timeout1000 = tcplimit*1000;
7c7ad977
PH
376 ldap_set_option(ld, LDAP_X_OPT_CONNECT_TIMEOUT, (void *)&timeout1000);
377 }
994a09e9
PH
378 else
379 {
380 int notimeout = LDAP_X_IO_TIMEOUT_NO_TIMEOUT;
381 ldap_set_option(ld, LDAP_X_OPT_CONNECT_TIMEOUT, (void *)&notimeout);
382 }
0756eb3c
PH
383 #endif
384
7c7ad977
PH
385 /* Set the TCP connect timeout. This works with OpenLDAP 2.2.14. */
386
387 #ifdef LDAP_OPT_NETWORK_TIMEOUT
388 if (tcplimit > 0)
389 ldap_set_option(ld, LDAP_OPT_NETWORK_TIMEOUT, (void *)timeoutptr);
8e669ac1 390 #endif
7c7ad977 391
0756eb3c
PH
392 /* I could not get TLS to work until I set the version to 3. That version
393 seems to be the default nowadays. The RFC is dated 1997, so I would hope
394 that all the LDAP libraries support it. Therefore, if eldap_version hasn't
395 been set, go for v3 if we can. */
396
397 if (eldap_version < 0)
398 {
399 #ifdef LDAP_VERSION3
400 eldap_version = LDAP_VERSION3;
401 #else
402 eldap_version = 2;
403 #endif
404 }
405
406 #ifdef LDAP_OPT_PROTOCOL_VERSION
407 ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, (void *)&eldap_version);
408 #endif
409
410 DEBUG(D_lookup) debug_printf("initialized for LDAP (v%d) server %s%s\n",
411 eldap_version, host, porttext);
412
413 /* If not using ldapi and TLS is available, set appropriate TLS options: hard
414 for "ldaps" and soft otherwise. */
415
416 #ifdef LDAP_OPT_X_TLS
417 if (!ldapi)
418 {
419 int tls_option;
420 if (strncmp(ludp->lud_scheme, "ldaps", 5) == 0)
421 {
422 tls_option = LDAP_OPT_X_TLS_HARD;
423 DEBUG(D_lookup) debug_printf("LDAP_OPT_X_TLS_HARD set\n");
424 }
425 else
426 {
427 tls_option = LDAP_OPT_X_TLS_TRY;
428 DEBUG(D_lookup) debug_printf("LDAP_OPT_X_TLS_TRY set\n");
429 }
430 ldap_set_option(ld, LDAP_OPT_X_TLS, (void *)&tls_option);
431 }
432 #endif /* LDAP_OPT_X_TLS */
433
bc19a55b
PP
434 #ifdef LDAP_OPT_X_TLS_CACERTFILE
435 if (eldap_ca_cert_file != NULL)
436 {
437 ldap_set_option(ld, LDAP_OPT_X_TLS_CACERTFILE, eldap_ca_cert_file);
438 }
439 #endif
440 #ifdef LDAP_OPT_X_TLS_CACERTDIR
441 if (eldap_ca_cert_dir != NULL)
442 {
443 ldap_set_option(ld, LDAP_OPT_X_TLS_CACERTDIR, eldap_ca_cert_dir);
444 }
445 #endif
446 #ifdef LDAP_OPT_X_TLS_CERTFILE
447 if (eldap_cert_file != NULL)
448 {
449 ldap_set_option(ld, LDAP_OPT_X_TLS_CERTFILE, eldap_cert_file);
450 }
451 #endif
452 #ifdef LDAP_OPT_X_TLS_KEYFILE
453 if (eldap_cert_key != NULL)
454 {
455 ldap_set_option(ld, LDAP_OPT_X_TLS_KEYFILE, eldap_cert_key);
456 }
457 #endif
458 #ifdef LDAP_OPT_X_TLS_CIPHER_SUITE
459 if (eldap_cipher_suite != NULL)
460 {
461 ldap_set_option(ld, LDAP_OPT_X_TLS_CIPHER_SUITE, eldap_cipher_suite);
462 }
463 #endif
464 #ifdef LDAP_OPT_X_TLS_REQUIRE_CERT
465 if (eldap_require_cert != NULL)
466 {
467 int cert_option = LDAP_OPT_X_TLS_NEVER;
468 if (Ustrcmp(eldap_require_cert, "hard") == 0)
469 {
470 cert_option = LDAP_OPT_X_TLS_HARD;
471 }
472 else if (Ustrcmp(eldap_require_cert, "demand") == 0)
473 {
474 cert_option = LDAP_OPT_X_TLS_DEMAND;
475 }
476 else if (Ustrcmp(eldap_require_cert, "allow") == 0)
477 {
478 cert_option = LDAP_OPT_X_TLS_ALLOW;
479 }
480 else if (Ustrcmp(eldap_require_cert, "try") == 0)
481 {
482 cert_option = LDAP_OPT_X_TLS_TRY;
483 }
10906672 484 ldap_set_option(ld, LDAP_OPT_X_TLS_REQUIRE_CERT, &cert_option);
bc19a55b
PP
485 }
486 #endif
487
0756eb3c
PH
488 /* Now add this connection to the chain of cached connections */
489
490 lcp = store_get(sizeof(LDAP_CONNECTION));
491 lcp->host = (host == NULL)? NULL : string_copy(host);
492 lcp->bound = FALSE;
493 lcp->user = NULL;
494 lcp->password = NULL;
495 lcp->port = port;
496 lcp->ld = ld;
497 lcp->next = ldap_connections;
498 ldap_connections = lcp;
499 }
500
501/* Found cached connection */
502
503else
504 {
505 DEBUG(D_lookup)
506 debug_printf("re-using cached connection to LDAP server %s%s\n",
507 host, porttext);
508 }
509
510/* Bind with the user/password supplied, or an anonymous bind if these values
511are NULL, unless a cached connection is already bound with the same values. */
512
513if (!lcp->bound ||
514 (lcp->user == NULL && user != NULL) ||
515 (lcp->user != NULL && user == NULL) ||
516 (lcp->user != NULL && user != NULL && Ustrcmp(lcp->user, user) != 0) ||
517 (lcp->password == NULL && password != NULL) ||
518 (lcp->password != NULL && password == NULL) ||
519 (lcp->password != NULL && password != NULL &&
520 Ustrcmp(lcp->password, password) != 0))
521 {
522 DEBUG(D_lookup) debug_printf("%sbinding with user=%s password=%s\n",
523 (lcp->bound)? "re-" : "", user, password);
bc19a55b
PP
524 if (eldap_start_tls)
525 {
526 ldap_start_tls_s(lcp->ld, NULL, NULL);
527 }
7c7ad977
PH
528 if ((msgid = ldap_bind(lcp->ld, CS user, CS password, LDAP_AUTH_SIMPLE))
529 == -1)
0756eb3c 530 {
7c7ad977 531 *errmsg = string_sprintf("failed to bind the LDAP connection to server "
d00328e2 532 "%s%s - ldap_bind() returned -1", host, porttext);
7c7ad977
PH
533 goto RETURN_ERROR;
534 }
0756eb3c 535
7c7ad977
PH
536 if ((rc = ldap_result( lcp->ld, msgid, 1, timeoutptr, &result )) <= 0)
537 {
538 *errmsg = string_sprintf("failed to bind the LDAP connection to server "
8e669ac1 539 "%s%s - LDAP error: %s", host, porttext,
7c7ad977
PH
540 rc == -1 ? "result retrieval failed" : "timeout" );
541 result = NULL;
542 goto RETURN_ERROR;
543 }
544
545 rc = ldap_result2error( lcp->ld, result, 0 );
546
547 /* Invalid credentials when just checking credentials returns FAIL. This
548 stops any further servers being tried. */
0756eb3c 549
7c7ad977
PH
550 if (search_type == SEARCH_LDAP_AUTH && rc == LDAP_INVALID_CREDENTIALS)
551 {
552 DEBUG(D_lookup)
553 debug_printf("Invalid credentials: ldapauth returns FAIL\n");
554 error_yield = FAIL;
555 goto RETURN_ERROR_NOMSG;
556 }
0756eb3c 557
7c7ad977
PH
558 /* Otherwise we have a problem that doesn't stop further servers from being
559 tried. */
560
561 if (rc != LDAP_SUCCESS)
562 {
0756eb3c
PH
563 *errmsg = string_sprintf("failed to bind the LDAP connection to server "
564 "%s%s - LDAP error %d: %s", host, porttext, rc, ldap_err2string(rc));
565 goto RETURN_ERROR;
566 }
567
568 /* Successful bind */
569
570 lcp->bound = TRUE;
571 lcp->user = (user == NULL)? NULL : string_copy(user);
572 lcp->password = (password == NULL)? NULL : string_copy(password);
7c7ad977
PH
573
574 ldap_msgfree(result);
575 result = NULL;
0756eb3c
PH
576 }
577
578/* If we are just checking credentials, return OK. */
579
580if (search_type == SEARCH_LDAP_AUTH)
581 {
582 DEBUG(D_lookup) debug_printf("Bind succeeded: ldapauth returns OK\n");
583 goto RETURN_OK;
584 }
585
586/* Before doing the search, set the time and size limits (if given). Here again
587the different implementations of LDAP have chosen to do things differently. */
588
589#if defined(LDAP_OPT_SIZELIMIT)
590ldap_set_option(lcp->ld, LDAP_OPT_SIZELIMIT, (void *)&sizelimit);
591ldap_set_option(lcp->ld, LDAP_OPT_TIMELIMIT, (void *)&timelimit);
592#else
593lcp->ld->ld_sizelimit = sizelimit;
594lcp->ld->ld_timelimit = timelimit;
595#endif
596
597/* Similarly for dereferencing aliases. Don't know if this is possible on
598an LDAP library without LDAP_OPT_DEREF. */
599
600#if defined(LDAP_OPT_DEREF)
601ldap_set_option(lcp->ld, LDAP_OPT_DEREF, (void *)&dereference);
602#endif
603
6ec97b1b
PH
604/* Similarly for the referral setting; should the library follow referrals that
605the LDAP server returns? The conditional is just in case someone uses a library
606without it. */
607
608#if defined(LDAP_OPT_REFERRALS)
609ldap_set_option(lcp->ld, LDAP_OPT_REFERRALS, referrals);
610#endif
611
0756eb3c
PH
612/* Start the search on the server. */
613
614DEBUG(D_lookup) debug_printf("Start search\n");
615
616msgid = ldap_search(lcp->ld, ludp->lud_dn, ludp->lud_scope, ludp->lud_filter,
617 ludp->lud_attrs, 0);
618
619if (msgid == -1)
620 {
3ca0ba97
PH
621 #if defined LDAP_LIB_SOLARIS || defined LDAP_LIB_OPENLDAP2
622 int err;
623 ldap_get_option(lcp->ld, LDAP_OPT_ERROR_NUMBER, &err);
8e669ac1 624 *errmsg = string_sprintf("ldap_search failed: %d, %s", err,
3ca0ba97 625 ldap_err2string(err));
8e669ac1
PH
626
627 #else
3ca0ba97
PH
628 *errmsg = string_sprintf("ldap_search failed");
629 #endif
8e669ac1 630
0756eb3c
PH
631 goto RETURN_ERROR;
632 }
633
634/* Loop to pick up results as they come in, setting a timeout if one was
635given. */
636
0756eb3c
PH
637while ((rc = ldap_result(lcp->ld, msgid, 0, timeoutptr, &result)) ==
638 LDAP_RES_SEARCH_ENTRY)
639 {
640 LDAPMessage *e;
641
642 DEBUG(D_lookup) debug_printf("ldap_result loop\n");
643
644 for(e = ldap_first_entry(lcp->ld, result);
645 e != NULL;
646 e = ldap_next_entry(lcp->ld, e))
647 {
648 uschar *new_dn;
649 BOOL insert_space = FALSE;
650
651 DEBUG(D_lookup) debug_printf("LDAP entry loop\n");
652
653 rescount++; /* Count results */
654
655 /* Results for multiple entries values are separated by newlines. */
656
657 if (data != NULL) data = string_cat(data, &size, &ptr, US"\n", 1);
658
659 /* Get the DN from the last result. */
660
661 new_dn = US ldap_get_dn(lcp->ld, e);
662 if (new_dn != NULL)
663 {
664 if (dn != NULL)
665 {
666 #if defined LDAP_LIB_NETSCAPE || defined LDAP_LIB_OPENLDAP2
667 ldap_memfree(dn);
668 #else /* OPENLDAP 1, UMich, Solaris */
669 free(dn);
670 #endif
671 }
672 /* Save for later */
673 dn = new_dn;
674 }
675
676 /* If the data we want is actually the DN rather than any attribute values,
677 (an "ldapdn" search) add it to the data string. If there are multiple
678 entries, the DNs will be concatenated, but we test for this case below, as
679 for SEARCH_LDAP_SINGLE, and give an error. */
680
681 if (search_type == SEARCH_LDAP_DN) /* Do not amalgamate these into one */
682 { /* condition, because of the else */
683 if (new_dn != NULL) /* below, that's for the first only */
684 {
685 data = string_cat(data, &size, &ptr, new_dn, Ustrlen(new_dn));
686 data[ptr] = 0;
687 attribute_found = TRUE;
688 }
689 }
690
691 /* Otherwise, loop through the entry, grabbing attribute values. If there's
692 only one attribute being retrieved, no attribute name is given, and the
693 result is not quoted. Multiple values are separated by (comma, space).
694 If more than one attribute is being retrieved, the data is given as a
695 sequence of name=value pairs, with the value always in quotes. If there are
696 multiple values, they are given within the quotes, comma separated. */
697
698 else for (attr = US ldap_first_attribute(lcp->ld, e, &ber);
699 attr != NULL;
700 attr = US ldap_next_attribute(lcp->ld, e, ber))
701 {
702 if (attr[0] != 0)
703 {
704 /* Get array of values for this attribute. */
705
706 if ((firstval = values = USS ldap_get_values(lcp->ld, e, CS attr))
707 != NULL)
708 {
709 if (attr_count != 1)
710 {
711 if (insert_space)
712 data = string_cat(data, &size, &ptr, US" ", 1);
713 else
714 insert_space = TRUE;
715 data = string_cat(data, &size, &ptr, attr, Ustrlen(attr));
716 data = string_cat(data, &size, &ptr, US"=\"", 2);
717 }
718
719 while (*values != NULL)
720 {
721 uschar *value = *values;
722 int len = Ustrlen(value);
723
724 DEBUG(D_lookup) debug_printf("LDAP attr loop %s:%s\n", attr, value);
725
726 if (values != firstval)
727 data = string_cat(data, &size, &ptr, US", ", 2);
728
729 /* For multiple attributes, the data is in quotes. We must escape
730 internal quotes, backslashes, newlines. */
731
732 if (attr_count != 1)
733 {
734 int j;
735 for (j = 0; j < len; j++)
736 {
737 if (value[j] == '\n')
738 data = string_cat(data, &size, &ptr, US"\\n", 2);
739 else
740 {
741 if (value[j] == '\"' || value[j] == '\\')
742 data = string_cat(data, &size, &ptr, US"\\", 1);
743 data = string_cat(data, &size, &ptr, value+j, 1);
744 }
745 }
746 }
747
748 /* For single attributes, copy the value verbatim */
749
750 else data = string_cat(data, &size, &ptr, value, len);
751
752 /* Move on to the next value */
753
754 values++;
755 attribute_found = TRUE;
756 }
757
758 /* Closing quote at the end of the data for a named attribute. */
759
760 if (attr_count != 1)
761 data = string_cat(data, &size, &ptr, US"\"", 1);
762
763 /* Free the values */
764
765 ldap_value_free(CSS firstval);
766 }
767 }
768
769 #if defined LDAP_LIB_NETSCAPE || defined LDAP_LIB_OPENLDAP2
770
771 /* Netscape and OpenLDAP2 LDAP's attrs are dynamically allocated and need
772 to be freed. UMich LDAP stores them in static storage and does not require
773 this. */
774
775 ldap_memfree(attr);
776 #endif
777 } /* End "for" loop for extracting attributes from an entry */
778 } /* End "for" loop for extracting entries from a result */
779
780 /* Free the result */
781
782 ldap_msgfree(result);
783 result = NULL;
784 } /* End "while" loop for multiple results */
785
786/* Terminate the dynamic string that we have built and reclaim unused store */
787
788if (data != NULL)
789 {
790 data[ptr] = 0;
791 store_reset(data + ptr + 1);
792 }
793
794/* Copy the last dn into eldap_dn */
795
796if (dn != NULL)
797 {
798 eldap_dn = string_copy(dn);
799 #if defined LDAP_LIB_NETSCAPE || defined LDAP_LIB_OPENLDAP2
800 ldap_memfree(dn);
801 #else /* OPENLDAP 1, UMich, Solaris */
802 free(dn);
803 #endif
804 }
805
806DEBUG(D_lookup) debug_printf("search ended by ldap_result yielding %d\n",rc);
807
808if (rc == 0)
809 {
810 *errmsg = US"ldap_result timed out";
811 goto RETURN_ERROR;
812 }
813
814/* A return code of -1 seems to mean "ldap_result failed internally or couldn't
815provide you with a message". Other error states seem to exist where
816ldap_result() didn't give us any message from the server at all, leaving result
817set to NULL. Apparently, "the error parameters of the LDAP session handle will
818be set accordingly". That's the best we can do to retrieve an error status; we
819can't use functions like ldap_result2error because they parse a message from
820the server, which we didn't get.
821
822Annoyingly, the different implementations of LDAP have gone for different
823methods of handling error codes and generating error messages. */
824
825if (rc == -1 || result == NULL)
826 {
827 int err;
828 DEBUG(D_lookup) debug_printf("ldap_result failed\n");
829
830 #if defined LDAP_LIB_SOLARIS || defined LDAP_LIB_OPENLDAP2
831 ldap_get_option(lcp->ld, LDAP_OPT_ERROR_NUMBER, &err);
832 *errmsg = string_sprintf("ldap_result failed: %d, %s",
833 err, ldap_err2string(err));
834
835 #elif defined LDAP_LIB_NETSCAPE
836 /* Dubious (surely 'matched' is spurious here?) */
837 (void)ldap_get_lderrno(lcp->ld, &matched, &error1);
838 *errmsg = string_sprintf("ldap_result failed: %s (%s)", error1, matched);
839
840 #else /* UMich LDAP aka OpenLDAP 1.x */
841 *errmsg = string_sprintf("ldap_result failed: %d, %s",
842 lcp->ld->ld_errno, ldap_err2string(lcp->ld->ld_errno));
843 #endif
844
845 goto RETURN_ERROR;
846 }
847
848/* A return code that isn't -1 doesn't necessarily mean there were no problems
8e669ac1
PH
849with the search. The message must be an LDAP_RES_SEARCH_RESULT or
850LDAP_RES_SEARCH_REFERENCE or else it's something we can't handle. Some versions
851of LDAP do not define LDAP_RES_SEARCH_REFERENCE (LDAP v1 is one, it seems). So
3295e65b
PH
852we don't provide that functionality when we can't. :-) */
853
8e669ac1 854if (rc != LDAP_RES_SEARCH_RESULT
3295e65b
PH
855#ifdef LDAP_RES_SEARCH_REFERENCE
856 && rc != LDAP_RES_SEARCH_REFERENCE
8e669ac1 857#endif
3295e65b 858 )
0756eb3c
PH
859 {
860 *errmsg = string_sprintf("ldap_result returned unexpected code %d", rc);
861 goto RETURN_ERROR;
862 }
863
864/* We have a result message from the server. This doesn't yet mean all is well.
865We need to parse the message to find out exactly what's happened. */
866
d38f8232
PH
867#if defined LDAP_LIB_SOLARIS || defined LDAP_LIB_OPENLDAP2
868 ldap_rc = rc;
8e669ac1 869 ldap_parse_rc = ldap_parse_result(lcp->ld, result, &rc, CSS &matched,
d38f8232
PH
870 CSS &error2, NULL, NULL, 0);
871 DEBUG(D_lookup) debug_printf("ldap_parse_result: %d\n", ldap_parse_rc);
8e669ac1 872 if (ldap_parse_rc < 0 &&
3295e65b 873 (ldap_parse_rc != LDAP_NO_RESULTS_RETURNED
8e669ac1 874 #ifdef LDAP_RES_SEARCH_REFERENCE
3295e65b 875 || ldap_rc != LDAP_RES_SEARCH_REFERENCE
8e669ac1 876 #endif
3295e65b 877 ))
0756eb3c 878 {
d38f8232 879 *errmsg = string_sprintf("ldap_parse_result failed %d", ldap_parse_rc);
0756eb3c
PH
880 goto RETURN_ERROR;
881 }
882 error1 = US ldap_err2string(rc);
883
884#elif defined LDAP_LIB_NETSCAPE
885 /* Dubious (it doesn't reference 'result' at all!) */
886 rc = ldap_get_lderrno(lcp->ld, &matched, &error1);
887
888#else /* UMich LDAP aka OpenLDAP 1.x */
889 rc = ldap_result2error(lcp->ld, result, 0);
890 error1 = ldap_err2string(rc);
891 error2 = lcp->ld->ld_error;
892 matched = lcp->ld->ld_matched;
893#endif
894
895/* Process the status as follows:
896
897 (1) If we get LDAP_SIZELIMIT_EXCEEDED, just carry on, to return the
898 truncated result list.
899
21eb6e72
PH
900 (2) If we get LDAP_RES_SEARCH_REFERENCE, also just carry on. This was a
901 submitted patch that is reported to "do the right thing" with Solaris
902 LDAP libraries. (The problem it addresses apparently does not occur with
903 Open LDAP.)
904
905 (3) The range of errors defined by LDAP_NAME_ERROR generally mean "that
0756eb3c
PH
906 object does not, or cannot, exist in the database". For those cases we
907 fail the lookup.
908
21eb6e72 909 (4) All other non-successes here are treated as some kind of problem with
0756eb3c
PH
910 the lookup, so return DEFER (which is the default in error_yield).
911*/
912
913DEBUG(D_lookup) debug_printf("ldap_parse_result yielded %d: %s\n",
914 rc, ldap_err2string(rc));
915
21eb6e72
PH
916if (rc != LDAP_SUCCESS && rc != LDAP_SIZELIMIT_EXCEEDED
917 #ifdef LDAP_RES_SEARCH_REFERENCE
918 && rc != LDAP_RES_SEARCH_REFERENCE
919 #endif
920 )
0756eb3c
PH
921 {
922 *errmsg = string_sprintf("LDAP search failed - error %d: %s%s%s%s%s",
923 rc,
924 (error1 != NULL)? error1 : US"",
925 (error2 != NULL && error2[0] != 0)? US"/" : US"",
926 (error2 != NULL)? error2 : US"",
927 (matched != NULL && matched[0] != 0)? US"/" : US"",
928 (matched != NULL)? matched : US"");
929
930 #if defined LDAP_NAME_ERROR
931 if (LDAP_NAME_ERROR(rc))
932 #elif defined NAME_ERROR /* OPENLDAP1 calls it this */
933 if (NAME_ERROR(rc))
934 #else
935 if (rc == LDAP_NO_SUCH_OBJECT)
936 #endif
937
938 {
939 DEBUG(D_lookup) debug_printf("lookup failure forced\n");
940 error_yield = FAIL;
941 }
942 goto RETURN_ERROR;
943 }
944
945/* The search succeeded. Check if we have too many results */
946
947if (search_type != SEARCH_LDAP_MULTIPLE && rescount > 1)
948 {
949 *errmsg = string_sprintf("LDAP search: more than one entry (%d) was returned "
950 "(filter not specific enough?)", rescount);
951 goto RETURN_ERROR_BREAK;
952 }
953
954/* Check if we have too few (zero) entries */
955
956if (rescount < 1)
957 {
958 *errmsg = string_sprintf("LDAP search: no results");
959 error_yield = FAIL;
960 goto RETURN_ERROR_BREAK;
961 }
962
963/* If an entry was found, but it had no attributes, we behave as if no entries
964were found, that is, the lookup failed. */
965
966if (!attribute_found)
967 {
968 *errmsg = US"LDAP search: found no attributes";
969 error_yield = FAIL;
970 goto RETURN_ERROR;
971 }
972
973/* Otherwise, it's all worked */
974
975DEBUG(D_lookup) debug_printf("LDAP search: returning: %s\n", data);
976*res = data;
977
978RETURN_OK:
979if (result != NULL) ldap_msgfree(result);
980ldap_free_urldesc(ludp);
981return OK;
982
983/* Error returns */
984
985RETURN_ERROR_BREAK:
986*defer_break = TRUE;
987
988RETURN_ERROR:
989DEBUG(D_lookup) debug_printf("%s\n", *errmsg);
990
991RETURN_ERROR_NOMSG:
992if (result != NULL) ldap_msgfree(result);
993if (ludp != NULL) ldap_free_urldesc(ludp);
994
995#if defined LDAP_LIB_OPENLDAP2
996 if (error2 != NULL) ldap_memfree(error2);
997 if (matched != NULL) ldap_memfree(matched);
998#endif
999
1000return error_yield;
1001}
1002
1003
1004
1005/*************************************************
1006* Internal search control function *
1007*************************************************/
1008
1009/* This function is called from eldap_find(), eldapauth_find(), eldapdn_find(),
1010and eldapm_find() with a difference in the "search_type" argument. It controls
1011calls to perform_ldap_search() which actually does the work. We call that
1012repeatedly for certain types of defer in the case when the URL contains no host
1013name and eldap_default_servers is set to a list of servers to try. This gives
1014more control than just passing over a list of hosts to ldap_open() because it
1015handles other kinds of defer as well as just a failure to open. Note that the
1016URL is defined to contain either zero or one "hostport" only.
1017
1018Parameter data in addition to the URL can be passed as preceding text in the
1019string, as items of the form XXX=yyy. The URL itself can be detected because it
1020must begin "ldapx://", where x is empty, s, or i.
1021
1022Arguments:
1023 ldap_url the URL to be looked up, optionally preceded by other parameter
1024 settings
1025 search_type SEARCH_LDAP_MULTIPLE allows values from multiple entries
1026 SEARCH_LDAP_SINGLE allows values from one entry only
1027 SEARCH_LDAP_DN gets the DN from one entry
1028 res set to point at the result
1029 errmsg set to point a message if result is not OK
1030
1031Returns: OK or FAIL or DEFER
1032*/
1033
1034static int
1035control_ldap_search(uschar *ldap_url, int search_type, uschar **res,
1036 uschar **errmsg)
1037{
1038BOOL defer_break = FALSE;
1039int timelimit = LDAP_NO_LIMIT;
1040int sizelimit = LDAP_NO_LIMIT;
7c7ad977 1041int tcplimit = 0;
0756eb3c 1042int sep = 0;
6ec97b1b
PH
1043int dereference = LDAP_DEREF_NEVER;
1044void* referrals = LDAP_OPT_ON;
0756eb3c
PH
1045uschar *url = ldap_url;
1046uschar *p;
1047uschar *user = NULL;
1048uschar *password = NULL;
1049uschar *server, *list;
1050uschar buffer[512];
1051
1052while (isspace(*url)) url++;
1053
1054/* Until the string begins "ldap", search for the other parameter settings that
1055are recognized. They are of the form NAME=VALUE, with the value being
1056optionally double-quoted. There must still be a space after it, however. No
1057NAME has the value "ldap". */
1058
1059while (strncmpic(url, US"ldap", 4) != 0)
1060 {
1061 uschar *name = url;
1062 while (*url != 0 && *url != '=') url++;
1063 if (*url == '=')
1064 {
1065 int namelen;
1066 uschar *value;
1067 namelen = ++url - name;
1068 value = string_dequote(&url);
1069 if (isspace(*url))
1070 {
1071 if (strncmpic(name, US"USER=", namelen) == 0) user = value;
1072 else if (strncmpic(name, US"PASS=", namelen) == 0) password = value;
1073 else if (strncmpic(name, US"SIZE=", namelen) == 0) sizelimit = Uatoi(value);
1074 else if (strncmpic(name, US"TIME=", namelen) == 0) timelimit = Uatoi(value);
7c7ad977
PH
1075 else if (strncmpic(name, US"CONNECT=", namelen) == 0) tcplimit = Uatoi(value);
1076 else if (strncmpic(name, US"NETTIME=", namelen) == 0) tcplimit = Uatoi(value);
0756eb3c
PH
1077
1078 /* Don't know if all LDAP libraries have LDAP_OPT_DEREF */
1079
1080 #ifdef LDAP_OPT_DEREF
1081 else if (strncmpic(name, US"DEREFERENCE=", namelen) == 0)
1082 {
1083 if (strcmpic(value, US"never") == 0) dereference = LDAP_DEREF_NEVER;
1084 else if (strcmpic(value, US"searching") == 0)
1085 dereference = LDAP_DEREF_SEARCHING;
1086 else if (strcmpic(value, US"finding") == 0)
1087 dereference = LDAP_DEREF_FINDING;
1088 if (strcmpic(value, US"always") == 0) dereference = LDAP_DEREF_ALWAYS;
1089 }
1090 #else
1091 else if (strncmpic(name, US"DEREFERENCE=", namelen) == 0)
1092 {
1093 *errmsg = string_sprintf("LDAP_OP_DEREF not defined in this LDAP "
1094 "library - cannot use \"dereference\"");
1095 DEBUG(D_lookup) debug_printf("%s\n", *errmsg);
1096 return DEFER;
1097 }
6ec97b1b 1098 #endif
0756eb3c 1099
6ec97b1b
PH
1100 #ifdef LDAP_OPT_REFERRALS
1101 else if (strncmpic(name, US"REFERRALS=", namelen) == 0)
1102 {
1103 if (strcmpic(value, US"follow") == 0) referrals = LDAP_OPT_ON;
1104 else if (strcmpic(value, US"nofollow") == 0) referrals = LDAP_OPT_OFF;
1105 else
1106 {
1107 *errmsg = string_sprintf("LDAP option REFERRALS is not \"follow\" "
1108 "or \"nofollow\"");
1109 DEBUG(D_lookup) debug_printf("%s\n", *errmsg);
1110 return DEFER;
1111 }
1112 }
1113 #else
1114 else if (strncmpic(name, US"REFERRALS=", namelen) == 0)
1115 {
1116 *errmsg = string_sprintf("LDAP_OP_REFERRALS not defined in this LDAP "
1117 "library - cannot use \"referrals\"");
1118 DEBUG(D_lookup) debug_printf("%s\n", *errmsg);
1119 return DEFER;
1120 }
0756eb3c
PH
1121 #endif
1122
1123 else
1124 {
1125 *errmsg =
1126 string_sprintf("unknown parameter \"%.*s\" precedes LDAP URL",
1127 namelen, name);
1128 DEBUG(D_lookup) debug_printf("LDAP query error: %s\n", *errmsg);
1129 return DEFER;
1130 }
1131 while (isspace(*url)) url++;
1132 continue;
1133 }
1134 }
1135 *errmsg = US"malformed parameter setting precedes LDAP URL";
1136 DEBUG(D_lookup) debug_printf("LDAP query error: %s\n", *errmsg);
1137 return DEFER;
1138 }
1139
1140/* If user is set, de-URL-quote it. Some LDAP libraries do this for themselves,
1141but it seems that not all behave like this. The DN for the user is often the
1142result of ${quote_ldap_dn:...} quoting, which does apply URL quoting, because
1143that is needed when the DN is used as a base DN in a query. Sigh. This is all
1144far too complicated. */
1145
1146if (user != NULL)
1147 {
1148 uschar *s;
1149 uschar *t = user;
1150 for (s = user; *s != 0; s++)
1151 {
1152 int c, d;
1153 if (*s == '%' && isxdigit(c=s[1]) && isxdigit(d=s[2]))
1154 {
1155 c = tolower(c);
1156 d = tolower(d);
1157 *t++ =
1158 (((c >= 'a')? (10 + c - 'a') : c - '0') << 4) |
1159 ((d >= 'a')? (10 + d - 'a') : d - '0');
1160 s += 2;
1161 }
1162 else *t++ = *s;
1163 }
1164 *t = 0;
1165 }
1166
1167DEBUG(D_lookup)
1168 debug_printf("LDAP parameters: user=%s pass=%s size=%d time=%d connect=%d "
6ec97b1b
PH
1169 "dereference=%d referrals=%s\n", user, password, sizelimit, timelimit,
1170 tcplimit, dereference, (referrals == LDAP_OPT_ON)? "on" : "off");
0756eb3c
PH
1171
1172/* If the request is just to check authentication, some credentials must
1173be given. The password must not be empty because LDAP binds with an empty
1174password are considered anonymous, and will succeed on most installations. */
1175
1176if (search_type == SEARCH_LDAP_AUTH)
1177 {
1178 if (user == NULL || password == NULL)
1179 {
1180 *errmsg = US"ldapauth lookups must specify the username and password";
1181 return DEFER;
1182 }
1183 if (password[0] == 0)
1184 {
1185 DEBUG(D_lookup) debug_printf("Empty password: ldapauth returns FAIL\n");
1186 return FAIL;
1187 }
1188 }
1189
1190/* Check for valid ldap url starters */
1191
1192p = url + 4;
1193if (tolower(*p) == 's' || tolower(*p) == 'i') p++;
1194if (Ustrncmp(p, "://", 3) != 0)
1195 {
1196 *errmsg = string_sprintf("LDAP URL does not start with \"ldap://\", "
1197 "\"ldaps://\", or \"ldapi://\" (it starts with \"%.16s...\")", url);
1198 DEBUG(D_lookup) debug_printf("LDAP query error: %s\n", *errmsg);
1199 return DEFER;
1200 }
1201
1202/* No default servers, or URL contains a server name: just one attempt */
1203
1204if (eldap_default_servers == NULL || p[3] != '/')
1205 {
1206 return perform_ldap_search(url, NULL, 0, search_type, res, errmsg,
6ec97b1b
PH
1207 &defer_break, user, password, sizelimit, timelimit, tcplimit, dereference,
1208 referrals);
0756eb3c
PH
1209 }
1210
1211/* Loop through the default servers until OK or FAIL */
1212
1213list = eldap_default_servers;
1214while ((server = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
1215 {
1216 int rc;
1217 int port = 0;
1218 uschar *colon = Ustrchr(server, ':');
1219 if (colon != NULL)
1220 {
1221 *colon = 0;
1222 port = Uatoi(colon+1);
1223 }
1224 rc = perform_ldap_search(url, server, port, search_type, res, errmsg,
6ec97b1b
PH
1225 &defer_break, user, password, sizelimit, timelimit, tcplimit, dereference,
1226 referrals);
0756eb3c
PH
1227 if (rc != DEFER || defer_break) return rc;
1228 }
1229
1230return DEFER;
1231}
1232
1233
1234
1235/*************************************************
1236* Find entry point *
1237*************************************************/
1238
1239/* See local README for interface description. The different kinds of search
1240are handled by a common function, with a flag to differentiate between them.
1241The handle and filename arguments are not used. */
1242
e6d225ae 1243static int
0756eb3c
PH
1244eldap_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1245 uschar **result, uschar **errmsg, BOOL *do_cache)
1246{
1247/* Keep picky compilers happy */
1248do_cache = do_cache;
1249return(control_ldap_search(ldap_url, SEARCH_LDAP_SINGLE, result, errmsg));
1250}
1251
e6d225ae 1252static int
0756eb3c
PH
1253eldapm_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1254 uschar **result, uschar **errmsg, BOOL *do_cache)
1255{
1256/* Keep picky compilers happy */
1257do_cache = do_cache;
1258return(control_ldap_search(ldap_url, SEARCH_LDAP_MULTIPLE, result, errmsg));
1259}
1260
e6d225ae 1261static int
0756eb3c
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1262eldapdn_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1263 uschar **result, uschar **errmsg, BOOL *do_cache)
1264{
1265/* Keep picky compilers happy */
1266do_cache = do_cache;
1267return(control_ldap_search(ldap_url, SEARCH_LDAP_DN, result, errmsg));
1268}
1269
1270int
1271eldapauth_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1272 uschar **result, uschar **errmsg, BOOL *do_cache)
1273{
1274/* Keep picky compilers happy */
1275do_cache = do_cache;
1276return(control_ldap_search(ldap_url, SEARCH_LDAP_AUTH, result, errmsg));
1277}
1278
1279
1280
1281/*************************************************
1282* Open entry point *
1283*************************************************/
1284
1285/* See local README for interface description. */
1286
e6d225ae 1287static void *
0756eb3c
PH
1288eldap_open(uschar *filename, uschar **errmsg)
1289{
1290return (void *)(1); /* Just return something non-null */
1291}
1292
1293
1294
1295/*************************************************
1296* Tidy entry point *
1297*************************************************/
1298
1299/* See local README for interface description.
1300Make sure that eldap_dn does not refer to reclaimed or worse, freed store */
1301
e6d225ae 1302static void
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1303eldap_tidy(void)
1304{
1305LDAP_CONNECTION *lcp = NULL;
1306eldap_dn = NULL;
1307
1308while ((lcp = ldap_connections) != NULL)
1309 {
1310 DEBUG(D_lookup) debug_printf("unbind LDAP connection to %s:%d\n", lcp->host,
1311 lcp->port);
1312 ldap_unbind(lcp->ld);
1313 ldap_connections = lcp->next;
1314 }
1315}
1316
1317
1318
1319/*************************************************
1320* Quote entry point *
1321*************************************************/
1322
1323/* LDAP quoting is unbelievably messy. For a start, two different levels of
1324quoting have to be done: LDAP quoting, and URL quoting. The current
1325specification is the result of a suggestion by Brian Candler. It recognizes
1326two separate cases:
1327
1328(1) For text that appears in a search filter, the following escapes are
1329 required (see RFC 2254):
1330
1331 * -> \2A
1332 ( -> \28
1333 ) -> \29
1334 \ -> \5C
1335 NULL -> \00
1336
1337 Then the entire filter text must be URL-escaped. This kind of quoting is
1338 implemented by ${quote_ldap:....}. Note that we can never have a NULL
1339 in the input string, because that's a terminator.
1340
1341(2) For a DN that is part of a URL (i.e. the base DN), the characters
1342
1343 , + " \ < > ;
1344
1345 must be quoted by backslashing. See RFC 2253. Leading and trailing spaces
1346 must be escaped, as must a leading #. Then the string must be URL-quoted.
1347 This type of quoting is implemented by ${quote_ldap_dn:....}.
1348
1349For URL quoting, the only characters that need not be quoted are the
1350alphamerics and
1351
1352 ! $ ' ( ) * + - . _
1353
1354All the others must be hexified and preceded by %. This includes the
1355backslashes used for LDAP quoting.
1356
1357For a DN that is given in the USER parameter for authentication, we need the
1358same initial quoting as (2) but in this case, the result must NOT be
1359URL-escaped, because it isn't a URL. The way this is handled is by
1360de-URL-quoting the text when processing the USER parameter in
1361control_ldap_search() above. That means that the same quote operator can be
1362used. This has the additional advantage that spaces in the DN won't cause
1363parsing problems. For example:
1364
1365 USER=cn=${quote_ldap_dn:$1},%20dc=example,%20dc=com
1366
1367should be safe if there are spaces in $1.
1368
1369
1370Arguments:
1371 s the string to be quoted
1372 opt additional option text or NULL if none
1373 only "dn" is recognized
1374
1375Returns: the processed string or NULL for a bad option
1376*/
1377
1378
1379
1380/* The characters in this string, together with alphanumerics, never need
1381quoting in any way. */
1382
1383#define ALWAYS_LITERAL "!$'-._"
1384
1385/* The special characters in this string do not need to be URL-quoted. The set
1386is a bit larger than the general literals. */
1387
1388#define URL_NONQUOTE ALWAYS_LITERAL "()*+"
1389
1390/* The following macros define the characters that are quoted by quote_ldap and
1391quote_ldap_dn, respectively. */
1392
1393#define LDAP_QUOTE "*()\\"
1394#define LDAP_DN_QUOTE ",+\"\\<>;"
1395
1396
1397
e6d225ae 1398static uschar *
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1399eldap_quote(uschar *s, uschar *opt)
1400{
1401register int c;
1402int count = 0;
1403int len = 0;
1404BOOL dn = FALSE;
1405uschar *t = s;
1406uschar *quoted;
1407
1408/* Test for a DN quotation. */
1409
1410if (opt != NULL)
1411 {
1412 if (Ustrcmp(opt, "dn") != 0) return NULL; /* No others recognized */
1413 dn = TRUE;
1414 }
1415
1416/* Compute how much extra store we need for the string. This doesn't have to be
1417exact as long as it isn't an underestimate. The worst case is the addition of 5
1418extra bytes for a single character. This occurs for certain characters in DNs,
1419where, for example, < turns into %5C%3C. For simplicity, we just add 5 for each
1420possibly escaped character. The really fast way would be just to test for
1421non-alphanumerics, but it is probably better to spot a few others that are
1422never escaped, because if there are no specials at all, we can avoid copying
1423the string. */
1424
1425while ((c = *t++) != 0)
1426 {
1427 len++;
1428 if (!isalnum(c) && Ustrchr(ALWAYS_LITERAL, c) == NULL) count += 5;
1429 }
1430if (count == 0) return s;
1431
1432/* Get sufficient store to hold the quoted string */
1433
1434t = quoted = store_get(len + count + 1);
1435
1436/* Handle plain quote_ldap */
1437
1438if (!dn)
1439 {
1440 while ((c = *s++) != 0)
1441 {
1442 if (!isalnum(c))
1443 {
1444 if (Ustrchr(LDAP_QUOTE, c) != NULL)
1445 {
1446 sprintf(CS t, "%%5C%02X", c); /* e.g. * => %5C2A */
1447 t += 5;
1448 continue;
1449 }
1450 if (Ustrchr(URL_NONQUOTE, c) == NULL) /* e.g. ] => %5D */
1451 {
1452 sprintf(CS t, "%%%02X", c);
1453 t += 3;
1454 continue;
1455 }
1456 }
1457 *t++ = c; /* unquoted character */
1458 }
1459 }
1460
1461/* Handle quote_ldap_dn */
1462
1463else
1464 {
1465 uschar *ss = s + len;
1466
1467 /* Find the last char before any trailing spaces */
1468
1469 while (ss > s && ss[-1] == ' ') ss--;
1470
1471 /* Quote leading spaces and sharps */
1472
1473 for (; s < ss; s++)
1474 {
1475 if (*s != ' ' && *s != '#') break;
1476 sprintf(CS t, "%%5C%%%02X", *s);
1477 t += 6;
1478 }
1479
1480 /* Handle the rest of the string, up to the trailing spaces */
1481
1482 while (s < ss)
1483 {
1484 c = *s++;
1485 if (!isalnum(c))
1486 {
1487 if (Ustrchr(LDAP_DN_QUOTE, c) != NULL)
1488 {
1489 Ustrncpy(t, "%5C", 3); /* insert \ where needed */
1490 t += 3; /* fall through to check URL */
1491 }
1492 if (Ustrchr(URL_NONQUOTE, c) == NULL) /* e.g. ] => %5D */
1493 {
1494 sprintf(CS t, "%%%02X", c);
1495 t += 3;
1496 continue;
1497 }
1498 }
1499 *t++ = c; /* unquoted character, or non-URL quoted after %5C */
1500 }
1501
1502 /* Handle the trailing spaces */
1503
1504 while (*ss++ != 0)
1505 {
1506 Ustrncpy(t, "%5C%20", 6);
1507 t += 6;
1508 }
1509 }
1510
1511/* Terminate the new string and return */
1512
1513*t = 0;
1514return quoted;
1515}
1516
6545de78
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1517
1518
1519/*************************************************
1520* Version reporting entry point *
1521*************************************************/
1522
1523/* See local README for interface description. */
1524
1525#include "../version.h"
1526
1527void
1528ldap_version_report(FILE *f)
1529{
1530#ifdef DYNLOOKUP
1531fprintf(f, "Library version: LDAP: Exim version %s\n", EXIM_VERSION_STR);
1532#endif
1533}
1534
1535
e6d225ae
DW
1536static lookup_info ldap_lookup_info = {
1537 US"ldap", /* lookup name */
1538 lookup_querystyle, /* query-style lookup */
1539 eldap_open, /* open function */
1540 NULL, /* check function */
1541 eldap_find, /* find function */
1542 NULL, /* no close function */
1543 eldap_tidy, /* tidy function */
6545de78
PP
1544 eldap_quote, /* quoting function */
1545 ldap_version_report /* version reporting */
e6d225ae
DW
1546};
1547
1548static lookup_info ldapdn_lookup_info = {
1549 US"ldapdn", /* lookup name */
1550 lookup_querystyle, /* query-style lookup */
1551 eldap_open, /* sic */ /* open function */
1552 NULL, /* check function */
1553 eldapdn_find, /* find function */
1554 NULL, /* no close function */
1555 eldap_tidy, /* sic */ /* tidy function */
6545de78
PP
1556 eldap_quote, /* sic */ /* quoting function */
1557 NULL /* no version reporting (redundant) */
e6d225ae
DW
1558};
1559
1560static lookup_info ldapm_lookup_info = {
1561 US"ldapm", /* lookup name */
1562 lookup_querystyle, /* query-style lookup */
1563 eldap_open, /* sic */ /* open function */
1564 NULL, /* check function */
1565 eldapm_find, /* find function */
1566 NULL, /* no close function */
1567 eldap_tidy, /* sic */ /* tidy function */
6545de78
PP
1568 eldap_quote, /* sic */ /* quoting function */
1569 NULL /* no version reporting (redundant) */
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DW
1570};
1571
1572#ifdef DYNLOOKUP
1573#define ldap_lookup_module_info _lookup_module_info
1574#endif
1575
1576static lookup_info *_lookup_list[] = { &ldap_lookup_info, &ldapdn_lookup_info, &ldapm_lookup_info };
1577lookup_module_info ldap_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 3 };
0756eb3c
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1578
1579/* End of lookups/ldap.c */