Alex Miller's patch for LDAP_RES_SEARCH_REFERENCE.
[exim.git] / src / src / lookups / ldap.c
1 /* $Cambridge: exim/src/src/lookups/ldap.c,v 1.5 2004/12/21 12:00:59 ph10 Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2004 */
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
11 driver. Further contibutions from Michael Haardt, Brian Candler, Barry
12 Pederson, Peter Savitch and Christian Kellner. Particular thanks to Brian for
13 researching how to handle the different kinds of error. */
14
15
16 #include "../exim.h"
17 #include "lf_functions.h"
18 #include "ldap.h"
19
20
21 /* We can't just compile this code and allow the library mechanism to omit the
22 functions if they are not wanted, because we need to have the LDAP headers
23 available for compiling. Therefore, compile these functions only if LOOKUP_LDAP
24 is defined. However, some compilers don't like compiling empty modules, so keep
25 them happy with a dummy when skipping the rest. Make it reference itself to
26 stop picky compilers complaining that it is unused, and put in a dummy argument
27 to stop even pickier compilers complaining about infinite loops. */
28
29 #ifndef LOOKUP_LDAP
30 static void dummy(int x) { dummy(x-1); }
31 #else
32
33
34 /* Include LDAP headers */
35
36 #include <lber.h>
37 #include <ldap.h>
38
39
40 /* Annoyingly, the different LDAP libraries handle errors in different ways,
41 and some other things too. There doesn't seem to be an automatic way of
42 distinguishing between them. Local/Makefile should contain a setting of
43 LDAP_LIB_TYPE, which in turn causes appropriate macros to be defined for the
44 different kinds. Those that matter are:
45
46 LDAP_LIB_NETSCAPE
47 LDAP_LIB_SOLARIS with synonym LDAP_LIB_SOLARIS7
48 LDAP_LIB_OPENLDAP2
49
50 These others may be defined, but are in fact the default, so are not tested:
51
52 LDAP_LIB_UMICHIGAN
53 LDAP_LIB_OPENLDAP1
54 */
55
56 #if defined(LDAP_LIB_SOLARIS7) && ! defined(LDAP_LIB_SOLARIS)
57 #define LDAP_LIB_SOLARIS
58 #endif
59
60
61 /* Just in case LDAP_NO_LIMIT is not defined by some of these libraries. */
62
63 #ifndef LDAP_NO_LIMIT
64 #define LDAP_NO_LIMIT 0
65 #endif
66
67
68 /* Just in case LDAP_DEREF_NEVER is not defined */
69
70 #ifndef LDAP_DEREF_NEVER
71 #define LDAP_DEREF_NEVER 0
72 #endif
73
74
75 /* Four types of LDAP search are implemented */
76
77 #define SEARCH_LDAP_MULTIPLE 0 /* Get attributes from multiple entries */
78 #define SEARCH_LDAP_SINGLE 1 /* Get attributes from one entry only */
79 #define SEARCH_LDAP_DN 2 /* Get just the DN from one entry */
80 #define SEARCH_LDAP_AUTH 3 /* Just checking for authentication */
81
82 /* In all 4 cases, the DN is left in $ldap_dn (which post-dates the
83 SEARCH_LDAP_DN lookup). */
84
85
86 /* Structure and anchor for caching connections. */
87
88 typedef struct ldap_connection {
89 struct ldap_connection *next;
90 uschar *host;
91 uschar *user;
92 uschar *password;
93 BOOL bound;
94 int port;
95 LDAP *ld;
96 } LDAP_CONNECTION;
97
98 static LDAP_CONNECTION *ldap_connections = NULL;
99
100
101
102 /*************************************************
103 * Internal search function *
104 *************************************************/
105
106 /* This is the function that actually does the work. It is called (indirectly
107 via control_ldap_search) from eldap_find(), eldapauth_find(), eldapdn_find(),
108 and eldapm_find(), with a difference in the "search_type" argument.
109
110 The case of eldapauth_find() is special in that all it does is do
111 authentication, returning OK or FAIL as appropriate. This isn't used as a
112 lookup. Instead, it is called from expand.c as an expansion condition test.
113
114 The DN from a successful lookup is placed in $ldap_dn. This feature postdates
115 the provision of the SEARCH_LDAP_DN facility for returning just the DN as the
116 data.
117
118 Arguments:
119 ldap_url the URL to be looked up
120 server server host name, when URL contains none
121 s_port server port, used when URL contains no name
122 search_type SEARCH_LDAP_MULTIPLE allows values from multiple entries
123 SEARCH_LDAP_SINGLE allows values from one entry only
124 SEARCH_LDAP_DN gets the DN from one entry
125 res set to point at the result (not used for ldapauth)
126 errmsg set to point a message if result is not OK
127 defer_break set TRUE if no more servers to be tried after a DEFER
128 user user name for authentication, or NULL
129 password password for authentication, or NULL
130 sizelimit max number of entries returned, or 0 for no limit
131 timelimit max time to wait, or 0 for no limit
132 tcplimit max time for network activity, e.g. connect, or 0 for OS default
133 deference the dereference option, which is one of
134 LDAP_DEREF_{NEVER,SEARCHING,FINDING,ALWAYS}
135
136 Returns: OK or FAIL or DEFER
137 FAIL is given only if a lookup was performed successfully, but
138 returned no data.
139 */
140
141 static int
142 perform_ldap_search(uschar *ldap_url, uschar *server, int s_port, int search_type,
143 uschar **res, uschar **errmsg, BOOL *defer_break, uschar *user, uschar *password,
144 int sizelimit, int timelimit, int tcplimit, int dereference)
145 {
146 LDAPURLDesc *ludp = NULL;
147 LDAPMessage *result = NULL;
148 BerElement *ber;
149 LDAP_CONNECTION *lcp;
150
151 struct timeval timeout;
152 struct timeval *timeoutptr = NULL;
153
154 uschar *attr;
155 uschar **attrp;
156 uschar *data = NULL;
157 uschar *dn = NULL;
158 uschar *host;
159 uschar **values;
160 uschar **firstval;
161 uschar porttext[16];
162
163 uschar *error1 = NULL; /* string representation of errcode (static) */
164 uschar *error2 = NULL; /* error message from the server */
165 uschar *matched = NULL; /* partially matched DN */
166
167 int attr_count = 0;
168 int error_yield = DEFER;
169 int msgid;
170 int rc, ldap_rc, ldap_parse_rc;
171 int port;
172 int ptr = 0;
173 int rescount = 0;
174 int size = 0;
175 BOOL attribute_found = FALSE;
176 BOOL ldapi = FALSE;
177
178 DEBUG(D_lookup)
179 debug_printf("perform_ldap_search: ldap%s URL = \"%s\" server=%s port=%d "
180 "sizelimit=%d timelimit=%d tcplimit=%d\n",
181 (search_type == SEARCH_LDAP_MULTIPLE)? "m" :
182 (search_type == SEARCH_LDAP_DN)? "dn" :
183 (search_type == SEARCH_LDAP_AUTH)? "auth" : "",
184 ldap_url, server, s_port, sizelimit, timelimit, tcplimit);
185
186 /* Check if LDAP thinks the URL is a valid LDAP URL. We assume that if the LDAP
187 library that is in use doesn't recognize, say, "ldapi", it will barf here. */
188
189 if (!ldap_is_ldap_url(CS ldap_url))
190 {
191 *errmsg = string_sprintf("ldap_is_ldap_url: not an LDAP url \"%s\"\n",
192 ldap_url);
193 goto RETURN_ERROR_BREAK;
194 }
195
196 /* Parse the URL */
197
198 if ((rc = ldap_url_parse(CS ldap_url, &ludp)) != 0)
199 {
200 *errmsg = string_sprintf("ldap_url_parse: (error %d) parsing \"%s\"\n", rc,
201 ldap_url);
202 goto RETURN_ERROR_BREAK;
203 }
204
205 /* If the host name is empty, take it from the separate argument, if one is
206 given. OpenLDAP 2.0.6 sets an unset hostname to "" rather than empty, but
207 expects NULL later in ldap_init() to mean "default", annoyingly. In OpenLDAP
208 2.0.11 this has changed (it uses NULL). */
209
210 if ((ludp->lud_host == NULL || ludp->lud_host[0] == 0) && server != NULL)
211 {
212 host = server;
213 port = s_port;
214 }
215 else
216 {
217 host = US ludp->lud_host;
218 if (host != NULL && host[0] == 0) host = NULL;
219 port = ludp->lud_port;
220 }
221
222 DEBUG(D_lookup) debug_printf("after ldap_url_parse: host=%s port=%d\n",
223 host, port);
224
225 if (port == 0) port = LDAP_PORT; /* Default if none given */
226 sprintf(CS porttext, ":%d", port); /* For messages */
227
228 /* If the "host name" is actually a path, we are going to connect using a Unix
229 socket, regardless of whether "ldapi" was actually specified or not. This means
230 that a Unix socket can be declared in eldap_default_servers, and "traditional"
231 LDAP queries using just "ldap" can be used ("ldaps" is similarly overridden).
232 The path may start with "/" or it may already be escaped as "%2F" if it was
233 actually declared that way in eldap_default_servers. (I did it that way the
234 first time.) If the host name is not a path, the use of "ldapi" causes an
235 error, except in the default case. (But lud_scheme doesn't seem to exist in
236 older libraries.) */
237
238 if (host != NULL)
239 {
240 if ((host[0] == '/' || Ustrncmp(host, "%2F", 3) == 0))
241 {
242 ldapi = TRUE;
243 porttext[0] = 0; /* Remove port from messages */
244 }
245
246 #if defined LDAP_LIB_OPENLDAP2
247 else if (strncmp(ludp->lud_scheme, "ldapi", 5) == 0)
248 {
249 *errmsg = string_sprintf("ldapi requires an absolute path (\"%s\" given)",
250 host);
251 goto RETURN_ERROR;
252 }
253 #endif
254 }
255
256 /* Count the attributes; we need this later to tell us how to format results */
257
258 for (attrp = USS ludp->lud_attrs; attrp != NULL && *attrp != NULL; attrp++)
259 attr_count++;
260
261 /* See if we can find a cached connection to this host. The port is not
262 relevant for ldapi. The host name pointer is set to NULL if no host was given
263 (implying the library default), rather than to the empty string. Note that in
264 this case, there is no difference between ldap and ldapi. */
265
266 for (lcp = ldap_connections; lcp != NULL; lcp = lcp->next)
267 {
268 if ((host == NULL) != (lcp->host == NULL) ||
269 (host != NULL && strcmpic(lcp->host, host) != 0))
270 continue;
271 if (ldapi || port == lcp->port) break;
272 }
273
274 /* Use this network timeout in any requests. */
275
276 if (tcplimit > 0)
277 {
278 timeout.tv_sec = tcplimit;
279 timeout.tv_usec = 0;
280 timeoutptr = &timeout;
281 }
282
283 /* If no cached connection found, we must open a connection to the server. If
284 the server name is actually an absolute path, we set ldapi=TRUE above. This
285 requests connection via a Unix socket. However, as far as I know, only OpenLDAP
286 supports the use of sockets, and the use of ldap_initialize(). */
287
288 if (lcp == NULL)
289 {
290 LDAP *ld;
291
292
293 /* --------------------------- OpenLDAP ------------------------ */
294
295 /* There seems to be a preference under OpenLDAP for ldap_initialize()
296 instead of ldap_init(), though I have as yet been unable to find
297 documentation that says this. (OpenLDAP documentation is sparse to
298 non-existent). So we handle OpenLDAP differently here. Also, support for
299 ldapi seems to be OpenLDAP-only at present. */
300
301 #ifdef LDAP_LIB_OPENLDAP2
302
303 /* We now need an empty string for the default host. Get some store in which
304 to build a URL for ldap_initialize(). In the ldapi case, it can't be bigger
305 than (9 + 3*Ustrlen(shost)), whereas in the other cases it can't be bigger
306 than the host name + "ldaps:///" plus : and a port number, say 20 + the
307 length of the host name. What we get should accommodate both, easily. */
308
309 uschar *shost = (host == NULL)? US"" : host;
310 uschar *init_url = store_get(20 + 3 * Ustrlen(shost));
311 uschar *init_ptr;
312
313 /* Handle connection via Unix socket ("ldapi"). We build a basic LDAP URI to
314 contain the path name, with slashes escaped as %2F. */
315
316 if (ldapi)
317 {
318 int ch;
319 init_ptr = init_url + 8;
320 Ustrcpy(init_url, "ldapi://");
321 while ((ch = *shost++) != 0)
322 {
323 if (ch == '/')
324 {
325 Ustrncpy(init_ptr, "%2F", 3);
326 init_ptr += 3;
327 }
328 else *init_ptr++ = ch;
329 }
330 *init_ptr = 0;
331 }
332
333 /* This is not an ldapi call. Just build a URI with the protocol type, host
334 name, and port. */
335
336 else
337 {
338 init_ptr = Ustrchr(ldap_url, '/');
339 Ustrncpy(init_url, ldap_url, init_ptr - ldap_url);
340 init_ptr = init_url + (init_ptr - ldap_url);
341 sprintf(CS init_ptr, "//%s:%d/", shost, port);
342 }
343
344 /* Call ldap_initialize() and check the result */
345
346 DEBUG(D_lookup) debug_printf("ldap_initialize with URL %s\n", init_url);
347 rc = ldap_initialize(&ld, CS init_url);
348 if (rc != LDAP_SUCCESS)
349 {
350 *errmsg = string_sprintf("ldap_initialize: (error %d) URL \"%s\"\n",
351 rc, init_url);
352 goto RETURN_ERROR;
353 }
354 store_reset(init_url); /* Might as well save memory when we can */
355
356
357 /* ------------------------- Not OpenLDAP ---------------------- */
358
359 /* For libraries other than OpenLDAP, use ldap_init(). */
360
361 #else /* LDAP_LIB_OPENLDAP2 */
362 ld = ldap_init(CS host, port);
363 #endif /* LDAP_LIB_OPENLDAP2 */
364
365 /* -------------------------------------------------------------- */
366
367
368 /* Handle failure to initialize */
369
370 if (ld == NULL)
371 {
372 *errmsg = string_sprintf("failed to initialize for LDAP server %s%s - %s",
373 host, porttext, strerror(errno));
374 goto RETURN_ERROR;
375 }
376
377 /* Set the TCP connect time limit if available. This is something that is
378 in Netscape SDK v4.1; I don't know about other libraries. */
379
380 #ifdef LDAP_X_OPT_CONNECT_TIMEOUT
381 if (tcplimit > 0)
382 {
383 int timeout1000 = tcplimit*1000;
384 ldap_set_option(ld, LDAP_X_OPT_CONNECT_TIMEOUT, (void *)&timeout1000);
385 }
386 else
387 {
388 int notimeout = LDAP_X_IO_TIMEOUT_NO_TIMEOUT;
389 ldap_set_option(ld, LDAP_X_OPT_CONNECT_TIMEOUT, (void *)&notimeout);
390 }
391 #endif
392
393 /* Set the TCP connect timeout. This works with OpenLDAP 2.2.14. */
394
395 #ifdef LDAP_OPT_NETWORK_TIMEOUT
396 if (tcplimit > 0)
397 ldap_set_option(ld, LDAP_OPT_NETWORK_TIMEOUT, (void *)timeoutptr);
398 #endif
399
400 /* I could not get TLS to work until I set the version to 3. That version
401 seems to be the default nowadays. The RFC is dated 1997, so I would hope
402 that all the LDAP libraries support it. Therefore, if eldap_version hasn't
403 been set, go for v3 if we can. */
404
405 if (eldap_version < 0)
406 {
407 #ifdef LDAP_VERSION3
408 eldap_version = LDAP_VERSION3;
409 #else
410 eldap_version = 2;
411 #endif
412 }
413
414 #ifdef LDAP_OPT_PROTOCOL_VERSION
415 ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, (void *)&eldap_version);
416 #endif
417
418 DEBUG(D_lookup) debug_printf("initialized for LDAP (v%d) server %s%s\n",
419 eldap_version, host, porttext);
420
421 /* If not using ldapi and TLS is available, set appropriate TLS options: hard
422 for "ldaps" and soft otherwise. */
423
424 #ifdef LDAP_OPT_X_TLS
425 if (!ldapi)
426 {
427 int tls_option;
428 if (strncmp(ludp->lud_scheme, "ldaps", 5) == 0)
429 {
430 tls_option = LDAP_OPT_X_TLS_HARD;
431 DEBUG(D_lookup) debug_printf("LDAP_OPT_X_TLS_HARD set\n");
432 }
433 else
434 {
435 tls_option = LDAP_OPT_X_TLS_TRY;
436 DEBUG(D_lookup) debug_printf("LDAP_OPT_X_TLS_TRY set\n");
437 }
438 ldap_set_option(ld, LDAP_OPT_X_TLS, (void *)&tls_option);
439 }
440 #endif /* LDAP_OPT_X_TLS */
441
442 /* Now add this connection to the chain of cached connections */
443
444 lcp = store_get(sizeof(LDAP_CONNECTION));
445 lcp->host = (host == NULL)? NULL : string_copy(host);
446 lcp->bound = FALSE;
447 lcp->user = NULL;
448 lcp->password = NULL;
449 lcp->port = port;
450 lcp->ld = ld;
451 lcp->next = ldap_connections;
452 ldap_connections = lcp;
453 }
454
455 /* Found cached connection */
456
457 else
458 {
459 DEBUG(D_lookup)
460 debug_printf("re-using cached connection to LDAP server %s%s\n",
461 host, porttext);
462 }
463
464 /* Bind with the user/password supplied, or an anonymous bind if these values
465 are NULL, unless a cached connection is already bound with the same values. */
466
467 if (!lcp->bound ||
468 (lcp->user == NULL && user != NULL) ||
469 (lcp->user != NULL && user == NULL) ||
470 (lcp->user != NULL && user != NULL && Ustrcmp(lcp->user, user) != 0) ||
471 (lcp->password == NULL && password != NULL) ||
472 (lcp->password != NULL && password == NULL) ||
473 (lcp->password != NULL && password != NULL &&
474 Ustrcmp(lcp->password, password) != 0))
475 {
476 DEBUG(D_lookup) debug_printf("%sbinding with user=%s password=%s\n",
477 (lcp->bound)? "re-" : "", user, password);
478 if ((msgid = ldap_bind(lcp->ld, CS user, CS password, LDAP_AUTH_SIMPLE))
479 == -1)
480 {
481 *errmsg = string_sprintf("failed to bind the LDAP connection to server "
482 "%s%s - ldap_bind() returned -1", host, porttext);
483 goto RETURN_ERROR;
484 }
485
486 if ((rc = ldap_result( lcp->ld, msgid, 1, timeoutptr, &result )) <= 0)
487 {
488 *errmsg = string_sprintf("failed to bind the LDAP connection to server "
489 "%s%s - LDAP error: %s", host, porttext,
490 rc == -1 ? "result retrieval failed" : "timeout" );
491 result = NULL;
492 goto RETURN_ERROR;
493 }
494
495 rc = ldap_result2error( lcp->ld, result, 0 );
496
497 /* Invalid credentials when just checking credentials returns FAIL. This
498 stops any further servers being tried. */
499
500 if (search_type == SEARCH_LDAP_AUTH && rc == LDAP_INVALID_CREDENTIALS)
501 {
502 DEBUG(D_lookup)
503 debug_printf("Invalid credentials: ldapauth returns FAIL\n");
504 error_yield = FAIL;
505 goto RETURN_ERROR_NOMSG;
506 }
507
508 /* Otherwise we have a problem that doesn't stop further servers from being
509 tried. */
510
511 if (rc != LDAP_SUCCESS)
512 {
513 *errmsg = string_sprintf("failed to bind the LDAP connection to server "
514 "%s%s - LDAP error %d: %s", host, porttext, rc, ldap_err2string(rc));
515 goto RETURN_ERROR;
516 }
517
518 /* Successful bind */
519
520 lcp->bound = TRUE;
521 lcp->user = (user == NULL)? NULL : string_copy(user);
522 lcp->password = (password == NULL)? NULL : string_copy(password);
523
524 ldap_msgfree(result);
525 result = NULL;
526 }
527
528 /* If we are just checking credentials, return OK. */
529
530 if (search_type == SEARCH_LDAP_AUTH)
531 {
532 DEBUG(D_lookup) debug_printf("Bind succeeded: ldapauth returns OK\n");
533 goto RETURN_OK;
534 }
535
536 /* Before doing the search, set the time and size limits (if given). Here again
537 the different implementations of LDAP have chosen to do things differently. */
538
539 #if defined(LDAP_OPT_SIZELIMIT)
540 ldap_set_option(lcp->ld, LDAP_OPT_SIZELIMIT, (void *)&sizelimit);
541 ldap_set_option(lcp->ld, LDAP_OPT_TIMELIMIT, (void *)&timelimit);
542 #else
543 lcp->ld->ld_sizelimit = sizelimit;
544 lcp->ld->ld_timelimit = timelimit;
545 #endif
546
547 /* Similarly for dereferencing aliases. Don't know if this is possible on
548 an LDAP library without LDAP_OPT_DEREF. */
549
550 #if defined(LDAP_OPT_DEREF)
551 ldap_set_option(lcp->ld, LDAP_OPT_DEREF, (void *)&dereference);
552 #endif
553
554 /* Start the search on the server. */
555
556 DEBUG(D_lookup) debug_printf("Start search\n");
557
558 msgid = ldap_search(lcp->ld, ludp->lud_dn, ludp->lud_scope, ludp->lud_filter,
559 ludp->lud_attrs, 0);
560
561 if (msgid == -1)
562 {
563 *errmsg = string_sprintf("ldap search initiation failed");
564 goto RETURN_ERROR;
565 }
566
567 /* Loop to pick up results as they come in, setting a timeout if one was
568 given. */
569
570 while ((rc = ldap_result(lcp->ld, msgid, 0, timeoutptr, &result)) ==
571 LDAP_RES_SEARCH_ENTRY)
572 {
573 LDAPMessage *e;
574
575 DEBUG(D_lookup) debug_printf("ldap_result loop\n");
576
577 for(e = ldap_first_entry(lcp->ld, result);
578 e != NULL;
579 e = ldap_next_entry(lcp->ld, e))
580 {
581 uschar *new_dn;
582 BOOL insert_space = FALSE;
583
584 DEBUG(D_lookup) debug_printf("LDAP entry loop\n");
585
586 rescount++; /* Count results */
587
588 /* Results for multiple entries values are separated by newlines. */
589
590 if (data != NULL) data = string_cat(data, &size, &ptr, US"\n", 1);
591
592 /* Get the DN from the last result. */
593
594 new_dn = US ldap_get_dn(lcp->ld, e);
595 if (new_dn != NULL)
596 {
597 if (dn != NULL)
598 {
599 #if defined LDAP_LIB_NETSCAPE || defined LDAP_LIB_OPENLDAP2
600 ldap_memfree(dn);
601 #else /* OPENLDAP 1, UMich, Solaris */
602 free(dn);
603 #endif
604 }
605 /* Save for later */
606 dn = new_dn;
607 }
608
609 /* If the data we want is actually the DN rather than any attribute values,
610 (an "ldapdn" search) add it to the data string. If there are multiple
611 entries, the DNs will be concatenated, but we test for this case below, as
612 for SEARCH_LDAP_SINGLE, and give an error. */
613
614 if (search_type == SEARCH_LDAP_DN) /* Do not amalgamate these into one */
615 { /* condition, because of the else */
616 if (new_dn != NULL) /* below, that's for the first only */
617 {
618 data = string_cat(data, &size, &ptr, new_dn, Ustrlen(new_dn));
619 data[ptr] = 0;
620 attribute_found = TRUE;
621 }
622 }
623
624 /* Otherwise, loop through the entry, grabbing attribute values. If there's
625 only one attribute being retrieved, no attribute name is given, and the
626 result is not quoted. Multiple values are separated by (comma, space).
627 If more than one attribute is being retrieved, the data is given as a
628 sequence of name=value pairs, with the value always in quotes. If there are
629 multiple values, they are given within the quotes, comma separated. */
630
631 else for (attr = US ldap_first_attribute(lcp->ld, e, &ber);
632 attr != NULL;
633 attr = US ldap_next_attribute(lcp->ld, e, ber))
634 {
635 if (attr[0] != 0)
636 {
637 /* Get array of values for this attribute. */
638
639 if ((firstval = values = USS ldap_get_values(lcp->ld, e, CS attr))
640 != NULL)
641 {
642 if (attr_count != 1)
643 {
644 if (insert_space)
645 data = string_cat(data, &size, &ptr, US" ", 1);
646 else
647 insert_space = TRUE;
648 data = string_cat(data, &size, &ptr, attr, Ustrlen(attr));
649 data = string_cat(data, &size, &ptr, US"=\"", 2);
650 }
651
652 while (*values != NULL)
653 {
654 uschar *value = *values;
655 int len = Ustrlen(value);
656
657 DEBUG(D_lookup) debug_printf("LDAP attr loop %s:%s\n", attr, value);
658
659 if (values != firstval)
660 data = string_cat(data, &size, &ptr, US", ", 2);
661
662 /* For multiple attributes, the data is in quotes. We must escape
663 internal quotes, backslashes, newlines. */
664
665 if (attr_count != 1)
666 {
667 int j;
668 for (j = 0; j < len; j++)
669 {
670 if (value[j] == '\n')
671 data = string_cat(data, &size, &ptr, US"\\n", 2);
672 else
673 {
674 if (value[j] == '\"' || value[j] == '\\')
675 data = string_cat(data, &size, &ptr, US"\\", 1);
676 data = string_cat(data, &size, &ptr, value+j, 1);
677 }
678 }
679 }
680
681 /* For single attributes, copy the value verbatim */
682
683 else data = string_cat(data, &size, &ptr, value, len);
684
685 /* Move on to the next value */
686
687 values++;
688 attribute_found = TRUE;
689 }
690
691 /* Closing quote at the end of the data for a named attribute. */
692
693 if (attr_count != 1)
694 data = string_cat(data, &size, &ptr, US"\"", 1);
695
696 /* Free the values */
697
698 ldap_value_free(CSS firstval);
699 }
700 }
701
702 #if defined LDAP_LIB_NETSCAPE || defined LDAP_LIB_OPENLDAP2
703
704 /* Netscape and OpenLDAP2 LDAP's attrs are dynamically allocated and need
705 to be freed. UMich LDAP stores them in static storage and does not require
706 this. */
707
708 ldap_memfree(attr);
709 #endif
710 } /* End "for" loop for extracting attributes from an entry */
711 } /* End "for" loop for extracting entries from a result */
712
713 /* Free the result */
714
715 ldap_msgfree(result);
716 result = NULL;
717 } /* End "while" loop for multiple results */
718
719 /* Terminate the dynamic string that we have built and reclaim unused store */
720
721 if (data != NULL)
722 {
723 data[ptr] = 0;
724 store_reset(data + ptr + 1);
725 }
726
727 /* Copy the last dn into eldap_dn */
728
729 if (dn != NULL)
730 {
731 eldap_dn = string_copy(dn);
732 #if defined LDAP_LIB_NETSCAPE || defined LDAP_LIB_OPENLDAP2
733 ldap_memfree(dn);
734 #else /* OPENLDAP 1, UMich, Solaris */
735 free(dn);
736 #endif
737 }
738
739 DEBUG(D_lookup) debug_printf("search ended by ldap_result yielding %d\n",rc);
740
741 if (rc == 0)
742 {
743 *errmsg = US"ldap_result timed out";
744 goto RETURN_ERROR;
745 }
746
747 /* A return code of -1 seems to mean "ldap_result failed internally or couldn't
748 provide you with a message". Other error states seem to exist where
749 ldap_result() didn't give us any message from the server at all, leaving result
750 set to NULL. Apparently, "the error parameters of the LDAP session handle will
751 be set accordingly". That's the best we can do to retrieve an error status; we
752 can't use functions like ldap_result2error because they parse a message from
753 the server, which we didn't get.
754
755 Annoyingly, the different implementations of LDAP have gone for different
756 methods of handling error codes and generating error messages. */
757
758 if (rc == -1 || result == NULL)
759 {
760 int err;
761 DEBUG(D_lookup) debug_printf("ldap_result failed\n");
762
763 #if defined LDAP_LIB_SOLARIS || defined LDAP_LIB_OPENLDAP2
764 ldap_get_option(lcp->ld, LDAP_OPT_ERROR_NUMBER, &err);
765 *errmsg = string_sprintf("ldap_result failed: %d, %s",
766 err, ldap_err2string(err));
767
768 #elif defined LDAP_LIB_NETSCAPE
769 /* Dubious (surely 'matched' is spurious here?) */
770 (void)ldap_get_lderrno(lcp->ld, &matched, &error1);
771 *errmsg = string_sprintf("ldap_result failed: %s (%s)", error1, matched);
772
773 #else /* UMich LDAP aka OpenLDAP 1.x */
774 *errmsg = string_sprintf("ldap_result failed: %d, %s",
775 lcp->ld->ld_errno, ldap_err2string(lcp->ld->ld_errno));
776 #endif
777
778 goto RETURN_ERROR;
779 }
780
781 /* A return code that isn't -1 doesn't necessarily mean there were no problems
782 with the search. The message must be an LDAP_RES_SEARCH_RESULT or
783 LDAP_RES_SEARCH_REFERENCE or else it's something we can't handle. */
784
785 if (rc != LDAP_RES_SEARCH_RESULT && rc != LDAP_RES_SEARCH_REFERENCE)
786 {
787 *errmsg = string_sprintf("ldap_result returned unexpected code %d", rc);
788 goto RETURN_ERROR;
789 }
790
791 /* We have a result message from the server. This doesn't yet mean all is well.
792 We need to parse the message to find out exactly what's happened. */
793
794 #if defined LDAP_LIB_SOLARIS || defined LDAP_LIB_OPENLDAP2
795 ldap_rc = rc;
796 ldap_parse_rc = ldap_parse_result(lcp->ld, result, &rc, CSS &matched,
797 CSS &error2, NULL, NULL, 0);
798 DEBUG(D_lookup) debug_printf("ldap_parse_result: %d\n", ldap_parse_rc);
799 if (ldap_parse_rc < 0 &&
800 (ldap_parse_rc != LDAP_NO_RESULTS_RETURNED ||
801 ldap_rc != LDAP_RES_SEARCH_REFERENCE))
802 {
803 *errmsg = string_sprintf("ldap_parse_result failed %d", ldap_parse_rc);
804 goto RETURN_ERROR;
805 }
806 error1 = US ldap_err2string(rc);
807
808 #elif defined LDAP_LIB_NETSCAPE
809 /* Dubious (it doesn't reference 'result' at all!) */
810 rc = ldap_get_lderrno(lcp->ld, &matched, &error1);
811
812 #else /* UMich LDAP aka OpenLDAP 1.x */
813 rc = ldap_result2error(lcp->ld, result, 0);
814 error1 = ldap_err2string(rc);
815 error2 = lcp->ld->ld_error;
816 matched = lcp->ld->ld_matched;
817 #endif
818
819 /* Process the status as follows:
820
821 (1) If we get LDAP_SIZELIMIT_EXCEEDED, just carry on, to return the
822 truncated result list.
823
824 (2) The range of errors defined by LDAP_NAME_ERROR generally mean "that
825 object does not, or cannot, exist in the database". For those cases we
826 fail the lookup.
827
828 (3) All other non-successes here are treated as some kind of problem with
829 the lookup, so return DEFER (which is the default in error_yield).
830 */
831
832 DEBUG(D_lookup) debug_printf("ldap_parse_result yielded %d: %s\n",
833 rc, ldap_err2string(rc));
834
835 if (rc != LDAP_SUCCESS && rc != LDAP_SIZELIMIT_EXCEEDED)
836 {
837 *errmsg = string_sprintf("LDAP search failed - error %d: %s%s%s%s%s",
838 rc,
839 (error1 != NULL)? error1 : US"",
840 (error2 != NULL && error2[0] != 0)? US"/" : US"",
841 (error2 != NULL)? error2 : US"",
842 (matched != NULL && matched[0] != 0)? US"/" : US"",
843 (matched != NULL)? matched : US"");
844
845 #if defined LDAP_NAME_ERROR
846 if (LDAP_NAME_ERROR(rc))
847 #elif defined NAME_ERROR /* OPENLDAP1 calls it this */
848 if (NAME_ERROR(rc))
849 #else
850 if (rc == LDAP_NO_SUCH_OBJECT)
851 #endif
852
853 {
854 DEBUG(D_lookup) debug_printf("lookup failure forced\n");
855 error_yield = FAIL;
856 }
857 goto RETURN_ERROR;
858 }
859
860 /* The search succeeded. Check if we have too many results */
861
862 if (search_type != SEARCH_LDAP_MULTIPLE && rescount > 1)
863 {
864 *errmsg = string_sprintf("LDAP search: more than one entry (%d) was returned "
865 "(filter not specific enough?)", rescount);
866 goto RETURN_ERROR_BREAK;
867 }
868
869 /* Check if we have too few (zero) entries */
870
871 if (rescount < 1)
872 {
873 *errmsg = string_sprintf("LDAP search: no results");
874 error_yield = FAIL;
875 goto RETURN_ERROR_BREAK;
876 }
877
878 /* If an entry was found, but it had no attributes, we behave as if no entries
879 were found, that is, the lookup failed. */
880
881 if (!attribute_found)
882 {
883 *errmsg = US"LDAP search: found no attributes";
884 error_yield = FAIL;
885 goto RETURN_ERROR;
886 }
887
888 /* Otherwise, it's all worked */
889
890 DEBUG(D_lookup) debug_printf("LDAP search: returning: %s\n", data);
891 *res = data;
892
893 RETURN_OK:
894 if (result != NULL) ldap_msgfree(result);
895 ldap_free_urldesc(ludp);
896 return OK;
897
898 /* Error returns */
899
900 RETURN_ERROR_BREAK:
901 *defer_break = TRUE;
902
903 RETURN_ERROR:
904 DEBUG(D_lookup) debug_printf("%s\n", *errmsg);
905
906 RETURN_ERROR_NOMSG:
907 if (result != NULL) ldap_msgfree(result);
908 if (ludp != NULL) ldap_free_urldesc(ludp);
909
910 #if defined LDAP_LIB_OPENLDAP2
911 if (error2 != NULL) ldap_memfree(error2);
912 if (matched != NULL) ldap_memfree(matched);
913 #endif
914
915 return error_yield;
916 }
917
918
919
920 /*************************************************
921 * Internal search control function *
922 *************************************************/
923
924 /* This function is called from eldap_find(), eldapauth_find(), eldapdn_find(),
925 and eldapm_find() with a difference in the "search_type" argument. It controls
926 calls to perform_ldap_search() which actually does the work. We call that
927 repeatedly for certain types of defer in the case when the URL contains no host
928 name and eldap_default_servers is set to a list of servers to try. This gives
929 more control than just passing over a list of hosts to ldap_open() because it
930 handles other kinds of defer as well as just a failure to open. Note that the
931 URL is defined to contain either zero or one "hostport" only.
932
933 Parameter data in addition to the URL can be passed as preceding text in the
934 string, as items of the form XXX=yyy. The URL itself can be detected because it
935 must begin "ldapx://", where x is empty, s, or i.
936
937 Arguments:
938 ldap_url the URL to be looked up, optionally preceded by other parameter
939 settings
940 search_type SEARCH_LDAP_MULTIPLE allows values from multiple entries
941 SEARCH_LDAP_SINGLE allows values from one entry only
942 SEARCH_LDAP_DN gets the DN from one entry
943 res set to point at the result
944 errmsg set to point a message if result is not OK
945
946 Returns: OK or FAIL or DEFER
947 */
948
949 static int
950 control_ldap_search(uschar *ldap_url, int search_type, uschar **res,
951 uschar **errmsg)
952 {
953 BOOL defer_break = FALSE;
954 int timelimit = LDAP_NO_LIMIT;
955 int sizelimit = LDAP_NO_LIMIT;
956 int tcplimit = 0;
957 int dereference = LDAP_DEREF_NEVER;
958 int sep = 0;
959 uschar *url = ldap_url;
960 uschar *p;
961 uschar *user = NULL;
962 uschar *password = NULL;
963 uschar *server, *list;
964 uschar buffer[512];
965
966 while (isspace(*url)) url++;
967
968 /* Until the string begins "ldap", search for the other parameter settings that
969 are recognized. They are of the form NAME=VALUE, with the value being
970 optionally double-quoted. There must still be a space after it, however. No
971 NAME has the value "ldap". */
972
973 while (strncmpic(url, US"ldap", 4) != 0)
974 {
975 uschar *name = url;
976 while (*url != 0 && *url != '=') url++;
977 if (*url == '=')
978 {
979 int namelen;
980 uschar *value;
981 namelen = ++url - name;
982 value = string_dequote(&url);
983 if (isspace(*url))
984 {
985 if (strncmpic(name, US"USER=", namelen) == 0) user = value;
986 else if (strncmpic(name, US"PASS=", namelen) == 0) password = value;
987 else if (strncmpic(name, US"SIZE=", namelen) == 0) sizelimit = Uatoi(value);
988 else if (strncmpic(name, US"TIME=", namelen) == 0) timelimit = Uatoi(value);
989 else if (strncmpic(name, US"CONNECT=", namelen) == 0) tcplimit = Uatoi(value);
990 else if (strncmpic(name, US"NETTIME=", namelen) == 0) tcplimit = Uatoi(value);
991
992 /* Don't know if all LDAP libraries have LDAP_OPT_DEREF */
993
994 #ifdef LDAP_OPT_DEREF
995 else if (strncmpic(name, US"DEREFERENCE=", namelen) == 0)
996 {
997 if (strcmpic(value, US"never") == 0) dereference = LDAP_DEREF_NEVER;
998 else if (strcmpic(value, US"searching") == 0)
999 dereference = LDAP_DEREF_SEARCHING;
1000 else if (strcmpic(value, US"finding") == 0)
1001 dereference = LDAP_DEREF_FINDING;
1002 if (strcmpic(value, US"always") == 0) dereference = LDAP_DEREF_ALWAYS;
1003 }
1004 #else
1005 else if (strncmpic(name, US"DEREFERENCE=", namelen) == 0)
1006 {
1007 *errmsg = string_sprintf("LDAP_OP_DEREF not defined in this LDAP "
1008 "library - cannot use \"dereference\"");
1009 DEBUG(D_lookup) debug_printf("%s\n", *errmsg);
1010 return DEFER;
1011 }
1012
1013 #endif
1014
1015 else
1016 {
1017 *errmsg =
1018 string_sprintf("unknown parameter \"%.*s\" precedes LDAP URL",
1019 namelen, name);
1020 DEBUG(D_lookup) debug_printf("LDAP query error: %s\n", *errmsg);
1021 return DEFER;
1022 }
1023 while (isspace(*url)) url++;
1024 continue;
1025 }
1026 }
1027 *errmsg = US"malformed parameter setting precedes LDAP URL";
1028 DEBUG(D_lookup) debug_printf("LDAP query error: %s\n", *errmsg);
1029 return DEFER;
1030 }
1031
1032 /* If user is set, de-URL-quote it. Some LDAP libraries do this for themselves,
1033 but it seems that not all behave like this. The DN for the user is often the
1034 result of ${quote_ldap_dn:...} quoting, which does apply URL quoting, because
1035 that is needed when the DN is used as a base DN in a query. Sigh. This is all
1036 far too complicated. */
1037
1038 if (user != NULL)
1039 {
1040 uschar *s;
1041 uschar *t = user;
1042 for (s = user; *s != 0; s++)
1043 {
1044 int c, d;
1045 if (*s == '%' && isxdigit(c=s[1]) && isxdigit(d=s[2]))
1046 {
1047 c = tolower(c);
1048 d = tolower(d);
1049 *t++ =
1050 (((c >= 'a')? (10 + c - 'a') : c - '0') << 4) |
1051 ((d >= 'a')? (10 + d - 'a') : d - '0');
1052 s += 2;
1053 }
1054 else *t++ = *s;
1055 }
1056 *t = 0;
1057 }
1058
1059 DEBUG(D_lookup)
1060 debug_printf("LDAP parameters: user=%s pass=%s size=%d time=%d connect=%d "
1061 "dereference=%d\n", user, password, sizelimit, timelimit, tcplimit,
1062 dereference);
1063
1064 /* If the request is just to check authentication, some credentials must
1065 be given. The password must not be empty because LDAP binds with an empty
1066 password are considered anonymous, and will succeed on most installations. */
1067
1068 if (search_type == SEARCH_LDAP_AUTH)
1069 {
1070 if (user == NULL || password == NULL)
1071 {
1072 *errmsg = US"ldapauth lookups must specify the username and password";
1073 return DEFER;
1074 }
1075 if (password[0] == 0)
1076 {
1077 DEBUG(D_lookup) debug_printf("Empty password: ldapauth returns FAIL\n");
1078 return FAIL;
1079 }
1080 }
1081
1082 /* Check for valid ldap url starters */
1083
1084 p = url + 4;
1085 if (tolower(*p) == 's' || tolower(*p) == 'i') p++;
1086 if (Ustrncmp(p, "://", 3) != 0)
1087 {
1088 *errmsg = string_sprintf("LDAP URL does not start with \"ldap://\", "
1089 "\"ldaps://\", or \"ldapi://\" (it starts with \"%.16s...\")", url);
1090 DEBUG(D_lookup) debug_printf("LDAP query error: %s\n", *errmsg);
1091 return DEFER;
1092 }
1093
1094 /* No default servers, or URL contains a server name: just one attempt */
1095
1096 if (eldap_default_servers == NULL || p[3] != '/')
1097 {
1098 return perform_ldap_search(url, NULL, 0, search_type, res, errmsg,
1099 &defer_break, user, password, sizelimit, timelimit, tcplimit, dereference);
1100 }
1101
1102 /* Loop through the default servers until OK or FAIL */
1103
1104 list = eldap_default_servers;
1105 while ((server = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
1106 {
1107 int rc;
1108 int port = 0;
1109 uschar *colon = Ustrchr(server, ':');
1110 if (colon != NULL)
1111 {
1112 *colon = 0;
1113 port = Uatoi(colon+1);
1114 }
1115 rc = perform_ldap_search(url, server, port, search_type, res, errmsg,
1116 &defer_break, user, password, sizelimit, timelimit, tcplimit, dereference);
1117 if (rc != DEFER || defer_break) return rc;
1118 }
1119
1120 return DEFER;
1121 }
1122
1123
1124
1125 /*************************************************
1126 * Find entry point *
1127 *************************************************/
1128
1129 /* See local README for interface description. The different kinds of search
1130 are handled by a common function, with a flag to differentiate between them.
1131 The handle and filename arguments are not used. */
1132
1133 int
1134 eldap_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1135 uschar **result, uschar **errmsg, BOOL *do_cache)
1136 {
1137 /* Keep picky compilers happy */
1138 do_cache = do_cache;
1139 return(control_ldap_search(ldap_url, SEARCH_LDAP_SINGLE, result, errmsg));
1140 }
1141
1142 int
1143 eldapm_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1144 uschar **result, uschar **errmsg, BOOL *do_cache)
1145 {
1146 /* Keep picky compilers happy */
1147 do_cache = do_cache;
1148 return(control_ldap_search(ldap_url, SEARCH_LDAP_MULTIPLE, result, errmsg));
1149 }
1150
1151 int
1152 eldapdn_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1153 uschar **result, uschar **errmsg, BOOL *do_cache)
1154 {
1155 /* Keep picky compilers happy */
1156 do_cache = do_cache;
1157 return(control_ldap_search(ldap_url, SEARCH_LDAP_DN, result, errmsg));
1158 }
1159
1160 int
1161 eldapauth_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1162 uschar **result, uschar **errmsg, BOOL *do_cache)
1163 {
1164 /* Keep picky compilers happy */
1165 do_cache = do_cache;
1166 return(control_ldap_search(ldap_url, SEARCH_LDAP_AUTH, result, errmsg));
1167 }
1168
1169
1170
1171 /*************************************************
1172 * Open entry point *
1173 *************************************************/
1174
1175 /* See local README for interface description. */
1176
1177 void *
1178 eldap_open(uschar *filename, uschar **errmsg)
1179 {
1180 return (void *)(1); /* Just return something non-null */
1181 }
1182
1183
1184
1185 /*************************************************
1186 * Tidy entry point *
1187 *************************************************/
1188
1189 /* See local README for interface description.
1190 Make sure that eldap_dn does not refer to reclaimed or worse, freed store */
1191
1192 void
1193 eldap_tidy(void)
1194 {
1195 LDAP_CONNECTION *lcp = NULL;
1196 eldap_dn = NULL;
1197
1198 while ((lcp = ldap_connections) != NULL)
1199 {
1200 DEBUG(D_lookup) debug_printf("unbind LDAP connection to %s:%d\n", lcp->host,
1201 lcp->port);
1202 ldap_unbind(lcp->ld);
1203 ldap_connections = lcp->next;
1204 }
1205 }
1206
1207
1208
1209 /*************************************************
1210 * Quote entry point *
1211 *************************************************/
1212
1213 /* LDAP quoting is unbelievably messy. For a start, two different levels of
1214 quoting have to be done: LDAP quoting, and URL quoting. The current
1215 specification is the result of a suggestion by Brian Candler. It recognizes
1216 two separate cases:
1217
1218 (1) For text that appears in a search filter, the following escapes are
1219 required (see RFC 2254):
1220
1221 * -> \2A
1222 ( -> \28
1223 ) -> \29
1224 \ -> \5C
1225 NULL -> \00
1226
1227 Then the entire filter text must be URL-escaped. This kind of quoting is
1228 implemented by ${quote_ldap:....}. Note that we can never have a NULL
1229 in the input string, because that's a terminator.
1230
1231 (2) For a DN that is part of a URL (i.e. the base DN), the characters
1232
1233 , + " \ < > ;
1234
1235 must be quoted by backslashing. See RFC 2253. Leading and trailing spaces
1236 must be escaped, as must a leading #. Then the string must be URL-quoted.
1237 This type of quoting is implemented by ${quote_ldap_dn:....}.
1238
1239 For URL quoting, the only characters that need not be quoted are the
1240 alphamerics and
1241
1242 ! $ ' ( ) * + - . _
1243
1244 All the others must be hexified and preceded by %. This includes the
1245 backslashes used for LDAP quoting.
1246
1247 For a DN that is given in the USER parameter for authentication, we need the
1248 same initial quoting as (2) but in this case, the result must NOT be
1249 URL-escaped, because it isn't a URL. The way this is handled is by
1250 de-URL-quoting the text when processing the USER parameter in
1251 control_ldap_search() above. That means that the same quote operator can be
1252 used. This has the additional advantage that spaces in the DN won't cause
1253 parsing problems. For example:
1254
1255 USER=cn=${quote_ldap_dn:$1},%20dc=example,%20dc=com
1256
1257 should be safe if there are spaces in $1.
1258
1259
1260 Arguments:
1261 s the string to be quoted
1262 opt additional option text or NULL if none
1263 only "dn" is recognized
1264
1265 Returns: the processed string or NULL for a bad option
1266 */
1267
1268
1269
1270 /* The characters in this string, together with alphanumerics, never need
1271 quoting in any way. */
1272
1273 #define ALWAYS_LITERAL "!$'-._"
1274
1275 /* The special characters in this string do not need to be URL-quoted. The set
1276 is a bit larger than the general literals. */
1277
1278 #define URL_NONQUOTE ALWAYS_LITERAL "()*+"
1279
1280 /* The following macros define the characters that are quoted by quote_ldap and
1281 quote_ldap_dn, respectively. */
1282
1283 #define LDAP_QUOTE "*()\\"
1284 #define LDAP_DN_QUOTE ",+\"\\<>;"
1285
1286
1287
1288 uschar *
1289 eldap_quote(uschar *s, uschar *opt)
1290 {
1291 register int c;
1292 int count = 0;
1293 int len = 0;
1294 BOOL dn = FALSE;
1295 uschar *t = s;
1296 uschar *quoted;
1297
1298 /* Test for a DN quotation. */
1299
1300 if (opt != NULL)
1301 {
1302 if (Ustrcmp(opt, "dn") != 0) return NULL; /* No others recognized */
1303 dn = TRUE;
1304 }
1305
1306 /* Compute how much extra store we need for the string. This doesn't have to be
1307 exact as long as it isn't an underestimate. The worst case is the addition of 5
1308 extra bytes for a single character. This occurs for certain characters in DNs,
1309 where, for example, < turns into %5C%3C. For simplicity, we just add 5 for each
1310 possibly escaped character. The really fast way would be just to test for
1311 non-alphanumerics, but it is probably better to spot a few others that are
1312 never escaped, because if there are no specials at all, we can avoid copying
1313 the string. */
1314
1315 while ((c = *t++) != 0)
1316 {
1317 len++;
1318 if (!isalnum(c) && Ustrchr(ALWAYS_LITERAL, c) == NULL) count += 5;
1319 }
1320 if (count == 0) return s;
1321
1322 /* Get sufficient store to hold the quoted string */
1323
1324 t = quoted = store_get(len + count + 1);
1325
1326 /* Handle plain quote_ldap */
1327
1328 if (!dn)
1329 {
1330 while ((c = *s++) != 0)
1331 {
1332 if (!isalnum(c))
1333 {
1334 if (Ustrchr(LDAP_QUOTE, c) != NULL)
1335 {
1336 sprintf(CS t, "%%5C%02X", c); /* e.g. * => %5C2A */
1337 t += 5;
1338 continue;
1339 }
1340 if (Ustrchr(URL_NONQUOTE, c) == NULL) /* e.g. ] => %5D */
1341 {
1342 sprintf(CS t, "%%%02X", c);
1343 t += 3;
1344 continue;
1345 }
1346 }
1347 *t++ = c; /* unquoted character */
1348 }
1349 }
1350
1351 /* Handle quote_ldap_dn */
1352
1353 else
1354 {
1355 uschar *ss = s + len;
1356
1357 /* Find the last char before any trailing spaces */
1358
1359 while (ss > s && ss[-1] == ' ') ss--;
1360
1361 /* Quote leading spaces and sharps */
1362
1363 for (; s < ss; s++)
1364 {
1365 if (*s != ' ' && *s != '#') break;
1366 sprintf(CS t, "%%5C%%%02X", *s);
1367 t += 6;
1368 }
1369
1370 /* Handle the rest of the string, up to the trailing spaces */
1371
1372 while (s < ss)
1373 {
1374 c = *s++;
1375 if (!isalnum(c))
1376 {
1377 if (Ustrchr(LDAP_DN_QUOTE, c) != NULL)
1378 {
1379 Ustrncpy(t, "%5C", 3); /* insert \ where needed */
1380 t += 3; /* fall through to check URL */
1381 }
1382 if (Ustrchr(URL_NONQUOTE, c) == NULL) /* e.g. ] => %5D */
1383 {
1384 sprintf(CS t, "%%%02X", c);
1385 t += 3;
1386 continue;
1387 }
1388 }
1389 *t++ = c; /* unquoted character, or non-URL quoted after %5C */
1390 }
1391
1392 /* Handle the trailing spaces */
1393
1394 while (*ss++ != 0)
1395 {
1396 Ustrncpy(t, "%5C%20", 6);
1397 t += 6;
1398 }
1399 }
1400
1401 /* Terminate the new string and return */
1402
1403 *t = 0;
1404 return quoted;
1405 }
1406
1407 #endif /* LOOKUP_LDAP */
1408
1409 /* End of lookups/ldap.c */