Two minor tidies to the recent ldap.c changes.
[exim.git] / src / src / lookups / ldap.c
1 /* $Cambridge: exim/src/src/lookups/ldap.c,v 1.3 2004/11/11 12:05:54 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;
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 unsigned int timeout1000 = tcplimit*1000;
384 ldap_set_option(ld, LDAP_X_OPT_CONNECT_TIMEOUT, (void *)&timeout1000);
385 }
386 #endif
387
388 /* Set the TCP connect timeout. This works with OpenLDAP 2.2.14. */
389
390 #ifdef LDAP_OPT_NETWORK_TIMEOUT
391 if (tcplimit > 0)
392 ldap_set_option(ld, LDAP_OPT_NETWORK_TIMEOUT, (void *)timeoutptr);
393 #endif
394
395 /* I could not get TLS to work until I set the version to 3. That version
396 seems to be the default nowadays. The RFC is dated 1997, so I would hope
397 that all the LDAP libraries support it. Therefore, if eldap_version hasn't
398 been set, go for v3 if we can. */
399
400 if (eldap_version < 0)
401 {
402 #ifdef LDAP_VERSION3
403 eldap_version = LDAP_VERSION3;
404 #else
405 eldap_version = 2;
406 #endif
407 }
408
409 #ifdef LDAP_OPT_PROTOCOL_VERSION
410 ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, (void *)&eldap_version);
411 #endif
412
413 DEBUG(D_lookup) debug_printf("initialized for LDAP (v%d) server %s%s\n",
414 eldap_version, host, porttext);
415
416 /* If not using ldapi and TLS is available, set appropriate TLS options: hard
417 for "ldaps" and soft otherwise. */
418
419 #ifdef LDAP_OPT_X_TLS
420 if (!ldapi)
421 {
422 int tls_option;
423 if (strncmp(ludp->lud_scheme, "ldaps", 5) == 0)
424 {
425 tls_option = LDAP_OPT_X_TLS_HARD;
426 DEBUG(D_lookup) debug_printf("LDAP_OPT_X_TLS_HARD set\n");
427 }
428 else
429 {
430 tls_option = LDAP_OPT_X_TLS_TRY;
431 DEBUG(D_lookup) debug_printf("LDAP_OPT_X_TLS_TRY set\n");
432 }
433 ldap_set_option(ld, LDAP_OPT_X_TLS, (void *)&tls_option);
434 }
435 #endif /* LDAP_OPT_X_TLS */
436
437 /* Now add this connection to the chain of cached connections */
438
439 lcp = store_get(sizeof(LDAP_CONNECTION));
440 lcp->host = (host == NULL)? NULL : string_copy(host);
441 lcp->bound = FALSE;
442 lcp->user = NULL;
443 lcp->password = NULL;
444 lcp->port = port;
445 lcp->ld = ld;
446 lcp->next = ldap_connections;
447 ldap_connections = lcp;
448 }
449
450 /* Found cached connection */
451
452 else
453 {
454 DEBUG(D_lookup)
455 debug_printf("re-using cached connection to LDAP server %s%s\n",
456 host, porttext);
457 }
458
459 /* Bind with the user/password supplied, or an anonymous bind if these values
460 are NULL, unless a cached connection is already bound with the same values. */
461
462 if (!lcp->bound ||
463 (lcp->user == NULL && user != NULL) ||
464 (lcp->user != NULL && user == NULL) ||
465 (lcp->user != NULL && user != NULL && Ustrcmp(lcp->user, user) != 0) ||
466 (lcp->password == NULL && password != NULL) ||
467 (lcp->password != NULL && password == NULL) ||
468 (lcp->password != NULL && password != NULL &&
469 Ustrcmp(lcp->password, password) != 0))
470 {
471 DEBUG(D_lookup) debug_printf("%sbinding with user=%s password=%s\n",
472 (lcp->bound)? "re-" : "", user, password);
473 if ((msgid = ldap_bind(lcp->ld, CS user, CS password, LDAP_AUTH_SIMPLE))
474 == -1)
475 {
476 *errmsg = string_sprintf("failed to bind the LDAP connection to server "
477 "%s%s - ldap_bind() returned -1", host, porttext);
478 goto RETURN_ERROR;
479 }
480
481 if ((rc = ldap_result( lcp->ld, msgid, 1, timeoutptr, &result )) <= 0)
482 {
483 *errmsg = string_sprintf("failed to bind the LDAP connection to server "
484 "%s%s - LDAP error: %s", host, porttext,
485 rc == -1 ? "result retrieval failed" : "timeout" );
486 result = NULL;
487 goto RETURN_ERROR;
488 }
489
490 rc = ldap_result2error( lcp->ld, result, 0 );
491
492 /* Invalid credentials when just checking credentials returns FAIL. This
493 stops any further servers being tried. */
494
495 if (search_type == SEARCH_LDAP_AUTH && rc == LDAP_INVALID_CREDENTIALS)
496 {
497 DEBUG(D_lookup)
498 debug_printf("Invalid credentials: ldapauth returns FAIL\n");
499 error_yield = FAIL;
500 goto RETURN_ERROR_NOMSG;
501 }
502
503 /* Otherwise we have a problem that doesn't stop further servers from being
504 tried. */
505
506 if (rc != LDAP_SUCCESS)
507 {
508 *errmsg = string_sprintf("failed to bind the LDAP connection to server "
509 "%s%s - LDAP error %d: %s", host, porttext, rc, ldap_err2string(rc));
510 goto RETURN_ERROR;
511 }
512
513 /* Successful bind */
514
515 lcp->bound = TRUE;
516 lcp->user = (user == NULL)? NULL : string_copy(user);
517 lcp->password = (password == NULL)? NULL : string_copy(password);
518
519 ldap_msgfree(result);
520 result = NULL;
521 }
522
523 /* If we are just checking credentials, return OK. */
524
525 if (search_type == SEARCH_LDAP_AUTH)
526 {
527 DEBUG(D_lookup) debug_printf("Bind succeeded: ldapauth returns OK\n");
528 goto RETURN_OK;
529 }
530
531 /* Before doing the search, set the time and size limits (if given). Here again
532 the different implementations of LDAP have chosen to do things differently. */
533
534 #if defined(LDAP_OPT_SIZELIMIT)
535 ldap_set_option(lcp->ld, LDAP_OPT_SIZELIMIT, (void *)&sizelimit);
536 ldap_set_option(lcp->ld, LDAP_OPT_TIMELIMIT, (void *)&timelimit);
537 #else
538 lcp->ld->ld_sizelimit = sizelimit;
539 lcp->ld->ld_timelimit = timelimit;
540 #endif
541
542 /* Similarly for dereferencing aliases. Don't know if this is possible on
543 an LDAP library without LDAP_OPT_DEREF. */
544
545 #if defined(LDAP_OPT_DEREF)
546 ldap_set_option(lcp->ld, LDAP_OPT_DEREF, (void *)&dereference);
547 #endif
548
549 /* Start the search on the server. */
550
551 DEBUG(D_lookup) debug_printf("Start search\n");
552
553 msgid = ldap_search(lcp->ld, ludp->lud_dn, ludp->lud_scope, ludp->lud_filter,
554 ludp->lud_attrs, 0);
555
556 if (msgid == -1)
557 {
558 *errmsg = string_sprintf("ldap search initiation failed");
559 goto RETURN_ERROR;
560 }
561
562 /* Loop to pick up results as they come in, setting a timeout if one was
563 given. */
564
565 while ((rc = ldap_result(lcp->ld, msgid, 0, timeoutptr, &result)) ==
566 LDAP_RES_SEARCH_ENTRY)
567 {
568 LDAPMessage *e;
569
570 DEBUG(D_lookup) debug_printf("ldap_result loop\n");
571
572 for(e = ldap_first_entry(lcp->ld, result);
573 e != NULL;
574 e = ldap_next_entry(lcp->ld, e))
575 {
576 uschar *new_dn;
577 BOOL insert_space = FALSE;
578
579 DEBUG(D_lookup) debug_printf("LDAP entry loop\n");
580
581 rescount++; /* Count results */
582
583 /* Results for multiple entries values are separated by newlines. */
584
585 if (data != NULL) data = string_cat(data, &size, &ptr, US"\n", 1);
586
587 /* Get the DN from the last result. */
588
589 new_dn = US ldap_get_dn(lcp->ld, e);
590 if (new_dn != NULL)
591 {
592 if (dn != NULL)
593 {
594 #if defined LDAP_LIB_NETSCAPE || defined LDAP_LIB_OPENLDAP2
595 ldap_memfree(dn);
596 #else /* OPENLDAP 1, UMich, Solaris */
597 free(dn);
598 #endif
599 }
600 /* Save for later */
601 dn = new_dn;
602 }
603
604 /* If the data we want is actually the DN rather than any attribute values,
605 (an "ldapdn" search) add it to the data string. If there are multiple
606 entries, the DNs will be concatenated, but we test for this case below, as
607 for SEARCH_LDAP_SINGLE, and give an error. */
608
609 if (search_type == SEARCH_LDAP_DN) /* Do not amalgamate these into one */
610 { /* condition, because of the else */
611 if (new_dn != NULL) /* below, that's for the first only */
612 {
613 data = string_cat(data, &size, &ptr, new_dn, Ustrlen(new_dn));
614 data[ptr] = 0;
615 attribute_found = TRUE;
616 }
617 }
618
619 /* Otherwise, loop through the entry, grabbing attribute values. If there's
620 only one attribute being retrieved, no attribute name is given, and the
621 result is not quoted. Multiple values are separated by (comma, space).
622 If more than one attribute is being retrieved, the data is given as a
623 sequence of name=value pairs, with the value always in quotes. If there are
624 multiple values, they are given within the quotes, comma separated. */
625
626 else for (attr = US ldap_first_attribute(lcp->ld, e, &ber);
627 attr != NULL;
628 attr = US ldap_next_attribute(lcp->ld, e, ber))
629 {
630 if (attr[0] != 0)
631 {
632 /* Get array of values for this attribute. */
633
634 if ((firstval = values = USS ldap_get_values(lcp->ld, e, CS attr))
635 != NULL)
636 {
637 if (attr_count != 1)
638 {
639 if (insert_space)
640 data = string_cat(data, &size, &ptr, US" ", 1);
641 else
642 insert_space = TRUE;
643 data = string_cat(data, &size, &ptr, attr, Ustrlen(attr));
644 data = string_cat(data, &size, &ptr, US"=\"", 2);
645 }
646
647 while (*values != NULL)
648 {
649 uschar *value = *values;
650 int len = Ustrlen(value);
651
652 DEBUG(D_lookup) debug_printf("LDAP attr loop %s:%s\n", attr, value);
653
654 if (values != firstval)
655 data = string_cat(data, &size, &ptr, US", ", 2);
656
657 /* For multiple attributes, the data is in quotes. We must escape
658 internal quotes, backslashes, newlines. */
659
660 if (attr_count != 1)
661 {
662 int j;
663 for (j = 0; j < len; j++)
664 {
665 if (value[j] == '\n')
666 data = string_cat(data, &size, &ptr, US"\\n", 2);
667 else
668 {
669 if (value[j] == '\"' || value[j] == '\\')
670 data = string_cat(data, &size, &ptr, US"\\", 1);
671 data = string_cat(data, &size, &ptr, value+j, 1);
672 }
673 }
674 }
675
676 /* For single attributes, copy the value verbatim */
677
678 else data = string_cat(data, &size, &ptr, value, len);
679
680 /* Move on to the next value */
681
682 values++;
683 attribute_found = TRUE;
684 }
685
686 /* Closing quote at the end of the data for a named attribute. */
687
688 if (attr_count != 1)
689 data = string_cat(data, &size, &ptr, US"\"", 1);
690
691 /* Free the values */
692
693 ldap_value_free(CSS firstval);
694 }
695 }
696
697 #if defined LDAP_LIB_NETSCAPE || defined LDAP_LIB_OPENLDAP2
698
699 /* Netscape and OpenLDAP2 LDAP's attrs are dynamically allocated and need
700 to be freed. UMich LDAP stores them in static storage and does not require
701 this. */
702
703 ldap_memfree(attr);
704 #endif
705 } /* End "for" loop for extracting attributes from an entry */
706 } /* End "for" loop for extracting entries from a result */
707
708 /* Free the result */
709
710 ldap_msgfree(result);
711 result = NULL;
712 } /* End "while" loop for multiple results */
713
714 /* Terminate the dynamic string that we have built and reclaim unused store */
715
716 if (data != NULL)
717 {
718 data[ptr] = 0;
719 store_reset(data + ptr + 1);
720 }
721
722 /* Copy the last dn into eldap_dn */
723
724 if (dn != NULL)
725 {
726 eldap_dn = string_copy(dn);
727 #if defined LDAP_LIB_NETSCAPE || defined LDAP_LIB_OPENLDAP2
728 ldap_memfree(dn);
729 #else /* OPENLDAP 1, UMich, Solaris */
730 free(dn);
731 #endif
732 }
733
734 DEBUG(D_lookup) debug_printf("search ended by ldap_result yielding %d\n",rc);
735
736 if (rc == 0)
737 {
738 *errmsg = US"ldap_result timed out";
739 goto RETURN_ERROR;
740 }
741
742 /* A return code of -1 seems to mean "ldap_result failed internally or couldn't
743 provide you with a message". Other error states seem to exist where
744 ldap_result() didn't give us any message from the server at all, leaving result
745 set to NULL. Apparently, "the error parameters of the LDAP session handle will
746 be set accordingly". That's the best we can do to retrieve an error status; we
747 can't use functions like ldap_result2error because they parse a message from
748 the server, which we didn't get.
749
750 Annoyingly, the different implementations of LDAP have gone for different
751 methods of handling error codes and generating error messages. */
752
753 if (rc == -1 || result == NULL)
754 {
755 int err;
756 DEBUG(D_lookup) debug_printf("ldap_result failed\n");
757
758 #if defined LDAP_LIB_SOLARIS || defined LDAP_LIB_OPENLDAP2
759 ldap_get_option(lcp->ld, LDAP_OPT_ERROR_NUMBER, &err);
760 *errmsg = string_sprintf("ldap_result failed: %d, %s",
761 err, ldap_err2string(err));
762
763 #elif defined LDAP_LIB_NETSCAPE
764 /* Dubious (surely 'matched' is spurious here?) */
765 (void)ldap_get_lderrno(lcp->ld, &matched, &error1);
766 *errmsg = string_sprintf("ldap_result failed: %s (%s)", error1, matched);
767
768 #else /* UMich LDAP aka OpenLDAP 1.x */
769 *errmsg = string_sprintf("ldap_result failed: %d, %s",
770 lcp->ld->ld_errno, ldap_err2string(lcp->ld->ld_errno));
771 #endif
772
773 goto RETURN_ERROR;
774 }
775
776 /* A return code that isn't -1 doesn't necessarily mean there were no problems
777 with the search. The message must be an LDAP_RES_SEARCH_RESULT or else it's
778 something we can't handle. */
779
780 if (rc != LDAP_RES_SEARCH_RESULT)
781 {
782 *errmsg = string_sprintf("ldap_result returned unexpected code %d", rc);
783 goto RETURN_ERROR;
784 }
785
786 /* We have a result message from the server. This doesn't yet mean all is well.
787 We need to parse the message to find out exactly what's happened. */
788
789 #if defined LDAP_LIB_SOLARIS || defined LDAP_LIB_OPENLDAP2
790 if (ldap_parse_result(lcp->ld, result, &rc, CSS &matched, CSS &error2, NULL,
791 NULL, 0) < 0)
792 {
793 *errmsg = US"ldap_parse_result failed";
794 goto RETURN_ERROR;
795 }
796 error1 = US ldap_err2string(rc);
797
798 #elif defined LDAP_LIB_NETSCAPE
799 /* Dubious (it doesn't reference 'result' at all!) */
800 rc = ldap_get_lderrno(lcp->ld, &matched, &error1);
801
802 #else /* UMich LDAP aka OpenLDAP 1.x */
803 rc = ldap_result2error(lcp->ld, result, 0);
804 error1 = ldap_err2string(rc);
805 error2 = lcp->ld->ld_error;
806 matched = lcp->ld->ld_matched;
807 #endif
808
809 /* Process the status as follows:
810
811 (1) If we get LDAP_SIZELIMIT_EXCEEDED, just carry on, to return the
812 truncated result list.
813
814 (2) The range of errors defined by LDAP_NAME_ERROR generally mean "that
815 object does not, or cannot, exist in the database". For those cases we
816 fail the lookup.
817
818 (3) All other non-successes here are treated as some kind of problem with
819 the lookup, so return DEFER (which is the default in error_yield).
820 */
821
822 DEBUG(D_lookup) debug_printf("ldap_parse_result yielded %d: %s\n",
823 rc, ldap_err2string(rc));
824
825 if (rc != LDAP_SUCCESS && rc != LDAP_SIZELIMIT_EXCEEDED)
826 {
827 *errmsg = string_sprintf("LDAP search failed - error %d: %s%s%s%s%s",
828 rc,
829 (error1 != NULL)? error1 : US"",
830 (error2 != NULL && error2[0] != 0)? US"/" : US"",
831 (error2 != NULL)? error2 : US"",
832 (matched != NULL && matched[0] != 0)? US"/" : US"",
833 (matched != NULL)? matched : US"");
834
835 #if defined LDAP_NAME_ERROR
836 if (LDAP_NAME_ERROR(rc))
837 #elif defined NAME_ERROR /* OPENLDAP1 calls it this */
838 if (NAME_ERROR(rc))
839 #else
840 if (rc == LDAP_NO_SUCH_OBJECT)
841 #endif
842
843 {
844 DEBUG(D_lookup) debug_printf("lookup failure forced\n");
845 error_yield = FAIL;
846 }
847 goto RETURN_ERROR;
848 }
849
850 /* The search succeeded. Check if we have too many results */
851
852 if (search_type != SEARCH_LDAP_MULTIPLE && rescount > 1)
853 {
854 *errmsg = string_sprintf("LDAP search: more than one entry (%d) was returned "
855 "(filter not specific enough?)", rescount);
856 goto RETURN_ERROR_BREAK;
857 }
858
859 /* Check if we have too few (zero) entries */
860
861 if (rescount < 1)
862 {
863 *errmsg = string_sprintf("LDAP search: no results");
864 error_yield = FAIL;
865 goto RETURN_ERROR_BREAK;
866 }
867
868 /* If an entry was found, but it had no attributes, we behave as if no entries
869 were found, that is, the lookup failed. */
870
871 if (!attribute_found)
872 {
873 *errmsg = US"LDAP search: found no attributes";
874 error_yield = FAIL;
875 goto RETURN_ERROR;
876 }
877
878 /* Otherwise, it's all worked */
879
880 DEBUG(D_lookup) debug_printf("LDAP search: returning: %s\n", data);
881 *res = data;
882
883 RETURN_OK:
884 if (result != NULL) ldap_msgfree(result);
885 ldap_free_urldesc(ludp);
886 return OK;
887
888 /* Error returns */
889
890 RETURN_ERROR_BREAK:
891 *defer_break = TRUE;
892
893 RETURN_ERROR:
894 DEBUG(D_lookup) debug_printf("%s\n", *errmsg);
895
896 RETURN_ERROR_NOMSG:
897 if (result != NULL) ldap_msgfree(result);
898 if (ludp != NULL) ldap_free_urldesc(ludp);
899
900 #if defined LDAP_LIB_OPENLDAP2
901 if (error2 != NULL) ldap_memfree(error2);
902 if (matched != NULL) ldap_memfree(matched);
903 #endif
904
905 return error_yield;
906 }
907
908
909
910 /*************************************************
911 * Internal search control function *
912 *************************************************/
913
914 /* This function is called from eldap_find(), eldapauth_find(), eldapdn_find(),
915 and eldapm_find() with a difference in the "search_type" argument. It controls
916 calls to perform_ldap_search() which actually does the work. We call that
917 repeatedly for certain types of defer in the case when the URL contains no host
918 name and eldap_default_servers is set to a list of servers to try. This gives
919 more control than just passing over a list of hosts to ldap_open() because it
920 handles other kinds of defer as well as just a failure to open. Note that the
921 URL is defined to contain either zero or one "hostport" only.
922
923 Parameter data in addition to the URL can be passed as preceding text in the
924 string, as items of the form XXX=yyy. The URL itself can be detected because it
925 must begin "ldapx://", where x is empty, s, or i.
926
927 Arguments:
928 ldap_url the URL to be looked up, optionally preceded by other parameter
929 settings
930 search_type SEARCH_LDAP_MULTIPLE allows values from multiple entries
931 SEARCH_LDAP_SINGLE allows values from one entry only
932 SEARCH_LDAP_DN gets the DN from one entry
933 res set to point at the result
934 errmsg set to point a message if result is not OK
935
936 Returns: OK or FAIL or DEFER
937 */
938
939 static int
940 control_ldap_search(uschar *ldap_url, int search_type, uschar **res,
941 uschar **errmsg)
942 {
943 BOOL defer_break = FALSE;
944 int timelimit = LDAP_NO_LIMIT;
945 int sizelimit = LDAP_NO_LIMIT;
946 int tcplimit = 0;
947 int dereference = LDAP_DEREF_NEVER;
948 int sep = 0;
949 uschar *url = ldap_url;
950 uschar *p;
951 uschar *user = NULL;
952 uschar *password = NULL;
953 uschar *server, *list;
954 uschar buffer[512];
955
956 while (isspace(*url)) url++;
957
958 /* Until the string begins "ldap", search for the other parameter settings that
959 are recognized. They are of the form NAME=VALUE, with the value being
960 optionally double-quoted. There must still be a space after it, however. No
961 NAME has the value "ldap". */
962
963 while (strncmpic(url, US"ldap", 4) != 0)
964 {
965 uschar *name = url;
966 while (*url != 0 && *url != '=') url++;
967 if (*url == '=')
968 {
969 int namelen;
970 uschar *value;
971 namelen = ++url - name;
972 value = string_dequote(&url);
973 if (isspace(*url))
974 {
975 if (strncmpic(name, US"USER=", namelen) == 0) user = value;
976 else if (strncmpic(name, US"PASS=", namelen) == 0) password = value;
977 else if (strncmpic(name, US"SIZE=", namelen) == 0) sizelimit = Uatoi(value);
978 else if (strncmpic(name, US"TIME=", namelen) == 0) timelimit = Uatoi(value);
979 else if (strncmpic(name, US"CONNECT=", namelen) == 0) tcplimit = Uatoi(value);
980 else if (strncmpic(name, US"NETTIME=", namelen) == 0) tcplimit = Uatoi(value);
981
982 /* Don't know if all LDAP libraries have LDAP_OPT_DEREF */
983
984 #ifdef LDAP_OPT_DEREF
985 else if (strncmpic(name, US"DEREFERENCE=", namelen) == 0)
986 {
987 if (strcmpic(value, US"never") == 0) dereference = LDAP_DEREF_NEVER;
988 else if (strcmpic(value, US"searching") == 0)
989 dereference = LDAP_DEREF_SEARCHING;
990 else if (strcmpic(value, US"finding") == 0)
991 dereference = LDAP_DEREF_FINDING;
992 if (strcmpic(value, US"always") == 0) dereference = LDAP_DEREF_ALWAYS;
993 }
994 #else
995 else if (strncmpic(name, US"DEREFERENCE=", namelen) == 0)
996 {
997 *errmsg = string_sprintf("LDAP_OP_DEREF not defined in this LDAP "
998 "library - cannot use \"dereference\"");
999 DEBUG(D_lookup) debug_printf("%s\n", *errmsg);
1000 return DEFER;
1001 }
1002
1003 #endif
1004
1005 else
1006 {
1007 *errmsg =
1008 string_sprintf("unknown parameter \"%.*s\" precedes LDAP URL",
1009 namelen, name);
1010 DEBUG(D_lookup) debug_printf("LDAP query error: %s\n", *errmsg);
1011 return DEFER;
1012 }
1013 while (isspace(*url)) url++;
1014 continue;
1015 }
1016 }
1017 *errmsg = US"malformed parameter setting precedes LDAP URL";
1018 DEBUG(D_lookup) debug_printf("LDAP query error: %s\n", *errmsg);
1019 return DEFER;
1020 }
1021
1022 /* If user is set, de-URL-quote it. Some LDAP libraries do this for themselves,
1023 but it seems that not all behave like this. The DN for the user is often the
1024 result of ${quote_ldap_dn:...} quoting, which does apply URL quoting, because
1025 that is needed when the DN is used as a base DN in a query. Sigh. This is all
1026 far too complicated. */
1027
1028 if (user != NULL)
1029 {
1030 uschar *s;
1031 uschar *t = user;
1032 for (s = user; *s != 0; s++)
1033 {
1034 int c, d;
1035 if (*s == '%' && isxdigit(c=s[1]) && isxdigit(d=s[2]))
1036 {
1037 c = tolower(c);
1038 d = tolower(d);
1039 *t++ =
1040 (((c >= 'a')? (10 + c - 'a') : c - '0') << 4) |
1041 ((d >= 'a')? (10 + d - 'a') : d - '0');
1042 s += 2;
1043 }
1044 else *t++ = *s;
1045 }
1046 *t = 0;
1047 }
1048
1049 DEBUG(D_lookup)
1050 debug_printf("LDAP parameters: user=%s pass=%s size=%d time=%d connect=%d "
1051 "dereference=%d\n", user, password, sizelimit, timelimit, tcplimit,
1052 dereference);
1053
1054 /* If the request is just to check authentication, some credentials must
1055 be given. The password must not be empty because LDAP binds with an empty
1056 password are considered anonymous, and will succeed on most installations. */
1057
1058 if (search_type == SEARCH_LDAP_AUTH)
1059 {
1060 if (user == NULL || password == NULL)
1061 {
1062 *errmsg = US"ldapauth lookups must specify the username and password";
1063 return DEFER;
1064 }
1065 if (password[0] == 0)
1066 {
1067 DEBUG(D_lookup) debug_printf("Empty password: ldapauth returns FAIL\n");
1068 return FAIL;
1069 }
1070 }
1071
1072 /* Check for valid ldap url starters */
1073
1074 p = url + 4;
1075 if (tolower(*p) == 's' || tolower(*p) == 'i') p++;
1076 if (Ustrncmp(p, "://", 3) != 0)
1077 {
1078 *errmsg = string_sprintf("LDAP URL does not start with \"ldap://\", "
1079 "\"ldaps://\", or \"ldapi://\" (it starts with \"%.16s...\")", url);
1080 DEBUG(D_lookup) debug_printf("LDAP query error: %s\n", *errmsg);
1081 return DEFER;
1082 }
1083
1084 /* No default servers, or URL contains a server name: just one attempt */
1085
1086 if (eldap_default_servers == NULL || p[3] != '/')
1087 {
1088 return perform_ldap_search(url, NULL, 0, search_type, res, errmsg,
1089 &defer_break, user, password, sizelimit, timelimit, tcplimit, dereference);
1090 }
1091
1092 /* Loop through the default servers until OK or FAIL */
1093
1094 list = eldap_default_servers;
1095 while ((server = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
1096 {
1097 int rc;
1098 int port = 0;
1099 uschar *colon = Ustrchr(server, ':');
1100 if (colon != NULL)
1101 {
1102 *colon = 0;
1103 port = Uatoi(colon+1);
1104 }
1105 rc = perform_ldap_search(url, server, port, search_type, res, errmsg,
1106 &defer_break, user, password, sizelimit, timelimit, tcplimit, dereference);
1107 if (rc != DEFER || defer_break) return rc;
1108 }
1109
1110 return DEFER;
1111 }
1112
1113
1114
1115 /*************************************************
1116 * Find entry point *
1117 *************************************************/
1118
1119 /* See local README for interface description. The different kinds of search
1120 are handled by a common function, with a flag to differentiate between them.
1121 The handle and filename arguments are not used. */
1122
1123 int
1124 eldap_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1125 uschar **result, uschar **errmsg, BOOL *do_cache)
1126 {
1127 /* Keep picky compilers happy */
1128 do_cache = do_cache;
1129 return(control_ldap_search(ldap_url, SEARCH_LDAP_SINGLE, result, errmsg));
1130 }
1131
1132 int
1133 eldapm_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1134 uschar **result, uschar **errmsg, BOOL *do_cache)
1135 {
1136 /* Keep picky compilers happy */
1137 do_cache = do_cache;
1138 return(control_ldap_search(ldap_url, SEARCH_LDAP_MULTIPLE, result, errmsg));
1139 }
1140
1141 int
1142 eldapdn_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1143 uschar **result, uschar **errmsg, BOOL *do_cache)
1144 {
1145 /* Keep picky compilers happy */
1146 do_cache = do_cache;
1147 return(control_ldap_search(ldap_url, SEARCH_LDAP_DN, result, errmsg));
1148 }
1149
1150 int
1151 eldapauth_find(void *handle, uschar *filename, uschar *ldap_url, int length,
1152 uschar **result, uschar **errmsg, BOOL *do_cache)
1153 {
1154 /* Keep picky compilers happy */
1155 do_cache = do_cache;
1156 return(control_ldap_search(ldap_url, SEARCH_LDAP_AUTH, result, errmsg));
1157 }
1158
1159
1160
1161 /*************************************************
1162 * Open entry point *
1163 *************************************************/
1164
1165 /* See local README for interface description. */
1166
1167 void *
1168 eldap_open(uschar *filename, uschar **errmsg)
1169 {
1170 return (void *)(1); /* Just return something non-null */
1171 }
1172
1173
1174
1175 /*************************************************
1176 * Tidy entry point *
1177 *************************************************/
1178
1179 /* See local README for interface description.
1180 Make sure that eldap_dn does not refer to reclaimed or worse, freed store */
1181
1182 void
1183 eldap_tidy(void)
1184 {
1185 LDAP_CONNECTION *lcp = NULL;
1186 eldap_dn = NULL;
1187
1188 while ((lcp = ldap_connections) != NULL)
1189 {
1190 DEBUG(D_lookup) debug_printf("unbind LDAP connection to %s:%d\n", lcp->host,
1191 lcp->port);
1192 ldap_unbind(lcp->ld);
1193 ldap_connections = lcp->next;
1194 }
1195 }
1196
1197
1198
1199 /*************************************************
1200 * Quote entry point *
1201 *************************************************/
1202
1203 /* LDAP quoting is unbelievably messy. For a start, two different levels of
1204 quoting have to be done: LDAP quoting, and URL quoting. The current
1205 specification is the result of a suggestion by Brian Candler. It recognizes
1206 two separate cases:
1207
1208 (1) For text that appears in a search filter, the following escapes are
1209 required (see RFC 2254):
1210
1211 * -> \2A
1212 ( -> \28
1213 ) -> \29
1214 \ -> \5C
1215 NULL -> \00
1216
1217 Then the entire filter text must be URL-escaped. This kind of quoting is
1218 implemented by ${quote_ldap:....}. Note that we can never have a NULL
1219 in the input string, because that's a terminator.
1220
1221 (2) For a DN that is part of a URL (i.e. the base DN), the characters
1222
1223 , + " \ < > ;
1224
1225 must be quoted by backslashing. See RFC 2253. Leading and trailing spaces
1226 must be escaped, as must a leading #. Then the string must be URL-quoted.
1227 This type of quoting is implemented by ${quote_ldap_dn:....}.
1228
1229 For URL quoting, the only characters that need not be quoted are the
1230 alphamerics and
1231
1232 ! $ ' ( ) * + - . _
1233
1234 All the others must be hexified and preceded by %. This includes the
1235 backslashes used for LDAP quoting.
1236
1237 For a DN that is given in the USER parameter for authentication, we need the
1238 same initial quoting as (2) but in this case, the result must NOT be
1239 URL-escaped, because it isn't a URL. The way this is handled is by
1240 de-URL-quoting the text when processing the USER parameter in
1241 control_ldap_search() above. That means that the same quote operator can be
1242 used. This has the additional advantage that spaces in the DN won't cause
1243 parsing problems. For example:
1244
1245 USER=cn=${quote_ldap_dn:$1},%20dc=example,%20dc=com
1246
1247 should be safe if there are spaces in $1.
1248
1249
1250 Arguments:
1251 s the string to be quoted
1252 opt additional option text or NULL if none
1253 only "dn" is recognized
1254
1255 Returns: the processed string or NULL for a bad option
1256 */
1257
1258
1259
1260 /* The characters in this string, together with alphanumerics, never need
1261 quoting in any way. */
1262
1263 #define ALWAYS_LITERAL "!$'-._"
1264
1265 /* The special characters in this string do not need to be URL-quoted. The set
1266 is a bit larger than the general literals. */
1267
1268 #define URL_NONQUOTE ALWAYS_LITERAL "()*+"
1269
1270 /* The following macros define the characters that are quoted by quote_ldap and
1271 quote_ldap_dn, respectively. */
1272
1273 #define LDAP_QUOTE "*()\\"
1274 #define LDAP_DN_QUOTE ",+\"\\<>;"
1275
1276
1277
1278 uschar *
1279 eldap_quote(uschar *s, uschar *opt)
1280 {
1281 register int c;
1282 int count = 0;
1283 int len = 0;
1284 BOOL dn = FALSE;
1285 uschar *t = s;
1286 uschar *quoted;
1287
1288 /* Test for a DN quotation. */
1289
1290 if (opt != NULL)
1291 {
1292 if (Ustrcmp(opt, "dn") != 0) return NULL; /* No others recognized */
1293 dn = TRUE;
1294 }
1295
1296 /* Compute how much extra store we need for the string. This doesn't have to be
1297 exact as long as it isn't an underestimate. The worst case is the addition of 5
1298 extra bytes for a single character. This occurs for certain characters in DNs,
1299 where, for example, < turns into %5C%3C. For simplicity, we just add 5 for each
1300 possibly escaped character. The really fast way would be just to test for
1301 non-alphanumerics, but it is probably better to spot a few others that are
1302 never escaped, because if there are no specials at all, we can avoid copying
1303 the string. */
1304
1305 while ((c = *t++) != 0)
1306 {
1307 len++;
1308 if (!isalnum(c) && Ustrchr(ALWAYS_LITERAL, c) == NULL) count += 5;
1309 }
1310 if (count == 0) return s;
1311
1312 /* Get sufficient store to hold the quoted string */
1313
1314 t = quoted = store_get(len + count + 1);
1315
1316 /* Handle plain quote_ldap */
1317
1318 if (!dn)
1319 {
1320 while ((c = *s++) != 0)
1321 {
1322 if (!isalnum(c))
1323 {
1324 if (Ustrchr(LDAP_QUOTE, c) != NULL)
1325 {
1326 sprintf(CS t, "%%5C%02X", c); /* e.g. * => %5C2A */
1327 t += 5;
1328 continue;
1329 }
1330 if (Ustrchr(URL_NONQUOTE, c) == NULL) /* e.g. ] => %5D */
1331 {
1332 sprintf(CS t, "%%%02X", c);
1333 t += 3;
1334 continue;
1335 }
1336 }
1337 *t++ = c; /* unquoted character */
1338 }
1339 }
1340
1341 /* Handle quote_ldap_dn */
1342
1343 else
1344 {
1345 uschar *ss = s + len;
1346
1347 /* Find the last char before any trailing spaces */
1348
1349 while (ss > s && ss[-1] == ' ') ss--;
1350
1351 /* Quote leading spaces and sharps */
1352
1353 for (; s < ss; s++)
1354 {
1355 if (*s != ' ' && *s != '#') break;
1356 sprintf(CS t, "%%5C%%%02X", *s);
1357 t += 6;
1358 }
1359
1360 /* Handle the rest of the string, up to the trailing spaces */
1361
1362 while (s < ss)
1363 {
1364 c = *s++;
1365 if (!isalnum(c))
1366 {
1367 if (Ustrchr(LDAP_DN_QUOTE, c) != NULL)
1368 {
1369 Ustrncpy(t, "%5C", 3); /* insert \ where needed */
1370 t += 3; /* fall through to check URL */
1371 }
1372 if (Ustrchr(URL_NONQUOTE, c) == NULL) /* e.g. ] => %5D */
1373 {
1374 sprintf(CS t, "%%%02X", c);
1375 t += 3;
1376 continue;
1377 }
1378 }
1379 *t++ = c; /* unquoted character, or non-URL quoted after %5C */
1380 }
1381
1382 /* Handle the trailing spaces */
1383
1384 while (*ss++ != 0)
1385 {
1386 Ustrncpy(t, "%5C%20", 6);
1387 t += 6;
1388 }
1389 }
1390
1391 /* Terminate the new string and return */
1392
1393 *t = 0;
1394 return quoted;
1395 }
1396
1397 #endif /* LOOKUP_LDAP */
1398
1399 /* End of lookups/ldap.c */