citadel/server/ldap.c

   1 // These functions implement the portions of AUTHMODE_LDAP and AUTHMODE_LDAP_AD which
   2 // actually speak to the LDAP server.
   3 //
   4 // Copyright (c) 2011-2022 by the citadel.org development team.
   5 //
   6 // This program is open source software.  Use, duplication, or disclosure
   7 // is subject to the terms of the GNU General Public License, version 3.
   8
   9 // ldapsearch -D uid=admin,cn=users,cn=compat,dc=demo1,dc=freeipa,dc=org -w Secret123 -h ipa.demo1.freeipa.org
  10
  11 int ctdl_require_ldap_version = 3;
  12
  13 #define _GNU_SOURCE             // Needed to suppress warning about vasprintf() when running on Linux/Linux
  14 #include <stdio.h>
  15 #include <libcitadel.h>
  16 #include "citserver.h"
  17 #include "citadel_ldap.h"
  18 #include "ctdl_module.h"
  19 #include "user_ops.h"
  20 #include "internet_addressing.h"
  21 #include "config.h"
  22 #include <ldap.h>
  23
  24
  25 // These functions are deprecated and until we change them to the new API we need these declarations to get around compiler warnings.
  26 int ldap_simple_bind_s(LDAP *, const char *, const char *);
  27 int ldap_unbind(LDAP *);
  28
  29
  30 // Utility function, supply a search result and get back the fullname (display name, common name, etc) from the first result
  31 //
  32 // POSIX schema:        the display name will be found in "cn" (common name)
  33 // Active Directory:    the display name will be found in "displayName"
  34 //
  35 void derive_fullname_from_ldap_result(char *fullname, int fullname_size, LDAP *ldserver, LDAPMessage *search_result) {
  36         struct berval **values;
  37
  38         if (fullname == NULL) return;
  39         if (search_result == NULL) return;
  40         if (ldserver == NULL) return;
  41
  42         if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_LDAP_AD) {
  43                 values = ldap_get_values_len(ldserver, search_result, "displayName");
  44                 if (values) {
  45                         if (ldap_count_values_len(values) > 0) {
  46                                 safestrncpy(fullname, values[0]->bv_val, fullname_size);
  47                                 syslog(LOG_DEBUG, "ldap: displayName = %s", fullname);
  48                         }
  49                         ldap_value_free_len(values);
  50                 }
  51         }
  52         else {
  53                 values = ldap_get_values_len(ldserver, search_result, "cn");
  54                 if (values) {
  55                         if (ldap_count_values_len(values) > 0) {
  56                                 safestrncpy(fullname, values[0]->bv_val, fullname_size);
  57                                 syslog(LOG_DEBUG, "ldap: cn = %s", fullname);
  58                         }
  59                         ldap_value_free_len(values);
  60                 }
  61         }
  62 }
  63
  64
  65 // Utility function, supply a search result and get back the uid from the first result
  66 //
  67 // POSIX schema:        numeric user id will be in the "uidNumber" attribute
  68 // Active Directory:    we make a uid hashed from "objectGUID"
  69 //
  70 uid_t derive_uid_from_ldap(LDAP *ldserver, LDAPMessage *entry) {
  71         struct berval **values;
  72         uid_t uid = (-1);
  73
  74         if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_LDAP_AD) {
  75                 values = ldap_get_values_len(ldserver, entry, "objectGUID");
  76                 if (values) {
  77                         if (ldap_count_values_len(values) > 0) {
  78                                 uid = abs(HashLittle(values[0]->bv_val, values[0]->bv_len));
  79                         }
  80                         ldap_value_free_len(values);
  81                 }
  82         }
  83         else {
  84                 values = ldap_get_values_len(ldserver, entry, "uidNumber");
  85                 if (values) {
  86                         if (ldap_count_values_len(values) > 0) {
  87                                 uid = atoi(values[0]->bv_val);
  88                         }
  89                         ldap_value_free_len(values);
  90                 }
  91         }
  92
  93         syslog(LOG_DEBUG, "ldap: uid = %d", uid);
  94         return(uid);
  95 }
  96
  97
  98 // Wrapper function for ldap_initialize() that consistently fills in the correct fields
  99 int ctdl_ldap_initialize(LDAP **ld) {
 100
 101         char server_url[256];
 102         int ret;
 103
 104         snprintf(server_url, sizeof server_url, "ldap://%s:%d", CtdlGetConfigStr("c_ldap_host"), CtdlGetConfigInt("c_ldap_port"));
 105         syslog(LOG_DEBUG, "ldap: initializing server %s", server_url);
 106         ret = ldap_initialize(ld, server_url);
 107         if (ret != LDAP_SUCCESS) {
 108                 syslog(LOG_ERR, "ldap: could not connect to %s : %m", server_url);
 109                 *ld = NULL;
 110                 return(errno);
 111         }
 112
 113         return(ret);
 114 }
 115
 116
 117 // Bind to the LDAP server and return a working handle
 118 LDAP *ctdl_ldap_bind(void) {
 119         LDAP *ldserver = NULL;
 120         int i;
 121
 122         if (ctdl_ldap_initialize(&ldserver) != LDAP_SUCCESS) {
 123                 return(NULL);
 124         }
 125
 126         ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
 127         ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
 128
 129         string_trim(CtdlGetConfigStr("c_ldap_bind_dn"));
 130         string_trim(CtdlGetConfigStr("c_ldap_bind_pw"));
 131         i = ldap_simple_bind_s(ldserver,
 132                 (!IsEmptyStr(CtdlGetConfigStr("c_ldap_bind_dn")) ? CtdlGetConfigStr("c_ldap_bind_dn") : NULL),
 133                 (!IsEmptyStr(CtdlGetConfigStr("c_ldap_bind_pw")) ? CtdlGetConfigStr("c_ldap_bind_pw") : NULL)
 134         );
 135         if (i != LDAP_SUCCESS) {
 136                 syslog(LOG_ERR, "ldap: Cannot bind: %s (%d)", ldap_err2string(i), i);
 137                 return(NULL);
 138         }
 139
 140         return(ldserver);
 141 }
 142
 143
 144 // Look up a user in the directory to see if this is an account that can be authenticated
 145 //
 146 // POSIX schema:        Search all "inetOrgPerson" objects with "uid" set to the supplied username
 147 // Active Directory:    Look for an account with "sAMAccountName" set to the supplied username
 148 //
 149 int CtdlTryUserLDAP(char *username, char *found_dn, int found_dn_size, char *fullname, int fullname_size, uid_t *uid) {
 150         LDAP *ldserver = NULL;
 151         LDAPMessage *search_result = NULL;
 152         LDAPMessage *entry = NULL;
 153         char searchstring[1024];
 154         struct timeval tv;
 155         char *user_dn = NULL;
 156
 157         ldserver = ctdl_ldap_bind();
 158         if (!ldserver) return(-1);
 159
 160         if (fullname) safestrncpy(fullname, username, fullname_size);
 161         tv.tv_sec = 10;
 162         tv.tv_usec = 0;
 163
 164         if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_LDAP_AD) {
 165                 snprintf(searchstring, sizeof(searchstring), "(sAMAccountName=%s)", username);
 166         }
 167         else {
 168                 snprintf(searchstring, sizeof(searchstring), "(&(objectclass=inetOrgPerson)(uid=%s))", username);
 169         }
 170
 171         syslog(LOG_DEBUG, "ldap: search: %s", searchstring);
 172         syslog(LOG_DEBUG, "ldap: search results: %s", ldap_err2string(ldap_search_ext_s(
 173                 ldserver,                                       // ld
 174                 CtdlGetConfigStr("c_ldap_base_dn"),             // base
 175                 LDAP_SCOPE_SUBTREE,                             // scope
 176                 searchstring,                                   // filter
 177                 NULL,                                           // attrs (all attributes)
 178                 0,                                              // attrsonly (attrs + values)
 179                 NULL,                                           // serverctrls (none)
 180                 NULL,                                           // clientctrls (none)
 181                 &tv,                                            // timeout
 182                 1,                                              // sizelimit (1 result max)
 183                 &search_result                                  // put the result here
 184         )));
 185
 186         // Ignore the return value of ldap_search_ext_s().  Sometimes it returns an error even when
 187         // the search succeeds.  Instead, we check to see whether search_result is still NULL.
 188         if (search_result == NULL) {
 189                 syslog(LOG_DEBUG, "ldap: zero search results were returned");
 190                 ldap_unbind(ldserver);
 191                 return(2);
 192         }
 193
 194         // At this point we've got at least one result from our query.  If there are multiple
 195         // results, we still only look at the first one.
 196         entry = ldap_first_entry(ldserver, search_result);
 197         if (entry) {
 198
 199                 user_dn = ldap_get_dn(ldserver, entry);
 200                 if (user_dn) {
 201                         syslog(LOG_DEBUG, "ldap: dn = %s", user_dn);
 202                 }
 203
 204                 derive_fullname_from_ldap_result(fullname, fullname_size, ldserver, search_result);
 205                 *uid = derive_uid_from_ldap(ldserver, search_result);
 206         }
 207
 208         // free the results
 209         ldap_msgfree(search_result);
 210
 211         // unbind so we can go back in as the authenticating user
 212         ldap_unbind(ldserver);
 213
 214         if (!user_dn) {
 215                 syslog(LOG_DEBUG, "ldap: No such user was found.");
 216                 return(4);
 217         }
 218
 219         if (found_dn) safestrncpy(found_dn, user_dn, found_dn_size);
 220         ldap_memfree(user_dn);
 221         return(0);
 222 }
 223
 224
 225 // This is an extension of CtdlTryPassword() which gets called when using LDAP authentication.
 226 int CtdlTryPasswordLDAP(char *user_dn, const char *password) {
 227         LDAP *ldserver = NULL;
 228         int i = (-1);
 229
 230         if (IsEmptyStr(password)) {
 231                 syslog(LOG_DEBUG, "ldap: empty passwords are not permitted");
 232                 return(1);
 233         }
 234
 235         syslog(LOG_DEBUG, "ldap: trying to bind as %s", user_dn);
 236         i = ctdl_ldap_initialize(&ldserver);
 237         if (i == LDAP_SUCCESS) {
 238                 ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
 239                 i = ldap_simple_bind_s(ldserver, user_dn, password);
 240                 if (i == LDAP_SUCCESS) {
 241                         syslog(LOG_DEBUG, "ldap: bind succeeded");
 242                 }
 243                 else {
 244                         syslog(LOG_DEBUG, "ldap: Cannot bind: %s (%d)", ldap_err2string(i), i);
 245                 }
 246                 ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
 247                 ldap_unbind(ldserver);
 248         }
 249
 250         if (i == LDAP_SUCCESS) {
 251                 return(0);
 252         }
 253
 254         return(1);
 255 }
 256
 257
 258 // set multiple properties
 259 // returns nonzero only if property changed.
 260 int vcard_set_props_iff_different(struct vCard *v, char *propname, int numvals, char **vals) {
 261         int i;
 262         char *oldval = "";
 263         for (i=0; i<numvals; i++) {
 264                 oldval = vcard_get_prop(v, propname, 0, i, 0);
 265                 if (oldval == NULL) break;
 266                 if (strcmp(vals[i],oldval)) break;
 267         }
 268         if (i != numvals) {
 269                 syslog(LOG_DEBUG, "ldap: vcard property %s, element %d of %d changed from %s to %s", propname, i, numvals, oldval, vals[i]);
 270                 for (i=0; i<numvals; i++) {
 271                         vcard_set_prop(v,propname,vals[i],(i==0) ? 0 : 1);
 272                 }
 273                 return 1;
 274         }
 275         return 0;
 276 }
 277
 278
 279 // set one property
 280 // returns nonzero only if property changed.
 281 int vcard_set_one_prop_iff_different(struct vCard *v,char *propname, char *newfmt, ...) {
 282         va_list args;
 283         char *newvalue;
 284         int did_change = 0;
 285         va_start(args,newfmt);
 286         if (vasprintf(&newvalue, newfmt, args) < 0) {
 287                 syslog(LOG_ERR, "ldap: out of memory");
 288                 return 0;
 289         }
 290         did_change = vcard_set_props_iff_different(v, propname, 1, &newvalue);
 291         va_end(args);
 292         free(newvalue);
 293         return did_change;
 294 }
 295
 296
 297 // Learn LDAP attributes and stuff them into the vCard.
 298 // Returns nonzero if we changed anything.
 299 int Ctdl_LDAP_to_vCard(char *ldap_dn, struct vCard *v) {
 300         int changed_something = 0;
 301         LDAP *ldserver = NULL;
 302         struct timeval tv;
 303         LDAPMessage *search_result = NULL;
 304         LDAPMessage *entry = NULL;
 305         struct berval **givenName;
 306         struct berval **sn;
 307         struct berval **cn;
 308         struct berval **initials;
 309         struct berval **o;
 310         struct berval **street;
 311         struct berval **l;
 312         struct berval **st;
 313         struct berval **postalCode;
 314         struct berval **telephoneNumber;
 315         struct berval **mobile;
 316         struct berval **homePhone;
 317         struct berval **facsimileTelephoneNumber;
 318         struct berval **mail;
 319         struct berval **uid;
 320         struct berval **homeDirectory;
 321         struct berval **uidNumber;
 322         struct berval **loginShell;
 323         struct berval **gidNumber;
 324         struct berval **c;
 325         struct berval **title;
 326         struct berval **uuid;
 327         char *attrs[] = { "*","+",NULL};
 328
 329         if (!ldap_dn) return(0);
 330         if (!v) return(0);
 331
 332         ldserver = ctdl_ldap_bind();
 333         if (!ldserver) return(-1);
 334
 335         tv.tv_sec = 10;
 336         tv.tv_usec = 0;
 337
 338         syslog(LOG_DEBUG, "ldap: search: %s", ldap_dn);
 339         syslog(LOG_DEBUG, "ldap: search results: %s", ldap_err2string(ldap_search_ext_s(
 340                 ldserver,                               // ld
 341                 ldap_dn,                                // base
 342                 LDAP_SCOPE_SUBTREE,                     // scope
 343                 NULL,                                   // filter
 344                 attrs,                                  // attrs (all attributes)
 345                 0,                                      // attrsonly (attrs + values)
 346                 NULL,                                   // serverctrls (none)
 347                 NULL,                                   // clientctrls (none)
 348                 &tv,                                    // timeout
 349                 1,                                      // sizelimit (1 result max)
 350                 &search_result                          // res
 351         )));
 352
 353         // Ignore the return value of ldap_search_ext_s().  Sometimes it returns an error even when
 354         // the search succeeds.  Instead, we check to see whether search_result is still NULL.
 355         if (search_result == NULL) {
 356                 syslog(LOG_DEBUG, "ldap: zero search results were returned");
 357                 ldap_unbind(ldserver);
 358                 return(0);
 359         }
 360
 361         // At this point we've got at least one result from our query.  If there are multiple
 362         // results, we still only look at the first one.
 363         entry = ldap_first_entry(ldserver, search_result);
 364         if (entry) {
 365                 syslog(LOG_DEBUG, "ldap: search got user details for vcard.");
 366                 givenName                       = ldap_get_values_len(ldserver, search_result, "givenName");
 367                 sn                              = ldap_get_values_len(ldserver, search_result, "sn");
 368                 cn                              = ldap_get_values_len(ldserver, search_result, "cn");
 369                 initials                        = ldap_get_values_len(ldserver, search_result, "initials");
 370                 title                           = ldap_get_values_len(ldserver, search_result, "title");
 371                 o                               = ldap_get_values_len(ldserver, search_result, "o");
 372                 street                          = ldap_get_values_len(ldserver, search_result, "street");
 373                 l                               = ldap_get_values_len(ldserver, search_result, "l");
 374                 st                              = ldap_get_values_len(ldserver, search_result, "st");
 375                 postalCode                      = ldap_get_values_len(ldserver, search_result, "postalCode");
 376                 telephoneNumber                 = ldap_get_values_len(ldserver, search_result, "telephoneNumber");
 377                 mobile                          = ldap_get_values_len(ldserver, search_result, "mobile");
 378                 homePhone                       = ldap_get_values_len(ldserver, search_result, "homePhone");
 379                 facsimileTelephoneNumber        = ldap_get_values_len(ldserver, search_result, "facsimileTelephoneNumber");
 380                 mail                            = ldap_get_values_len(ldserver, search_result, "mail");
 381                 uid                             = ldap_get_values_len(ldserver, search_result, "uid");
 382                 homeDirectory                   = ldap_get_values_len(ldserver, search_result, "homeDirectory");
 383                 uidNumber                       = ldap_get_values_len(ldserver, search_result, "uidNumber");
 384                 loginShell                      = ldap_get_values_len(ldserver, search_result, "loginShell");
 385                 gidNumber                       = ldap_get_values_len(ldserver, search_result, "gidNumber");
 386                 c                               = ldap_get_values_len(ldserver, search_result, "c");
 387                 uuid                            = ldap_get_values_len(ldserver, search_result, "entryUUID");
 388
 389                 if (street && l && st && postalCode && c) changed_something |= vcard_set_one_prop_iff_different(v,"adr",";;%s;%s;%s;%s;%s",street[0]->bv_val,l[0]->bv_val,st[0]->bv_val,postalCode[0]->bv_val,c[0]->bv_val);
 390                 if (telephoneNumber) changed_something |= vcard_set_one_prop_iff_different(v,"tel;work","%s",telephoneNumber[0]->bv_val);
 391                 if (facsimileTelephoneNumber) changed_something |= vcard_set_one_prop_iff_different(v,"tel;fax","%s",facsimileTelephoneNumber[0]->bv_val);
 392                 if (mobile) changed_something |= vcard_set_one_prop_iff_different(v,"tel;cell","%s",mobile[0]->bv_val);
 393                 if (homePhone) changed_something |= vcard_set_one_prop_iff_different(v,"tel;home","%s",homePhone[0]->bv_val);
 394                 if (givenName && sn) {
 395                         if (initials) {
 396                                 changed_something |= vcard_set_one_prop_iff_different(v,"n","%s;%s;%s",sn[0]->bv_val,givenName[0]->bv_val,initials[0]->bv_val);
 397                         }
 398                         else {
 399                                 changed_something |= vcard_set_one_prop_iff_different(v,"n","%s;%s",sn[0]->bv_val,givenName[0]->bv_val);
 400                         }
 401                 }
 402
 403                 // FIXME we need a new way to do this.
 404                 //if (mail) {
 405                         //changed_something |= vcard_set_props_iff_different(v,"email;internet",ldap_count_values_len(mail),mail);
 406                 //}
 407
 408                 if (uuid) changed_something |= vcard_set_one_prop_iff_different(v,"X-uuid","%s",uuid[0]->bv_val);
 409                 if (o) changed_something |= vcard_set_one_prop_iff_different(v,"org","%s",o[0]->bv_val);
 410                 if (cn) changed_something |= vcard_set_one_prop_iff_different(v,"fn","%s",cn[0]->bv_val);
 411                 if (title) changed_something |= vcard_set_one_prop_iff_different(v,"title","%s",title[0]->bv_val);
 412
 413                 if (givenName)                  ldap_value_free_len(givenName);
 414                 if (initials)                   ldap_value_free_len(initials);
 415                 if (sn)                         ldap_value_free_len(sn);
 416                 if (cn)                         ldap_value_free_len(cn);
 417                 if (o)                          ldap_value_free_len(o);
 418                 if (street)                     ldap_value_free_len(street);
 419                 if (l)                          ldap_value_free_len(l);
 420                 if (st)                         ldap_value_free_len(st);
 421                 if (postalCode)                 ldap_value_free_len(postalCode);
 422                 if (telephoneNumber)            ldap_value_free_len(telephoneNumber);
 423                 if (mobile)                     ldap_value_free_len(mobile);
 424                 if (homePhone)                  ldap_value_free_len(homePhone);
 425                 if (facsimileTelephoneNumber)   ldap_value_free_len(facsimileTelephoneNumber);
 426                 if (mail)                       ldap_value_free_len(mail);
 427                 if (uid)                        ldap_value_free_len(uid);
 428                 if (homeDirectory)              ldap_value_free_len(homeDirectory);
 429                 if (uidNumber)                  ldap_value_free_len(uidNumber);
 430                 if (loginShell)                 ldap_value_free_len(loginShell);
 431                 if (gidNumber)                  ldap_value_free_len(gidNumber);
 432                 if (c)                          ldap_value_free_len(c);
 433                 if (title)                      ldap_value_free_len(title);
 434                 if (uuid)                       ldap_value_free_len(uuid);
 435         }
 436         // free the results
 437         ldap_msgfree(search_result);
 438
 439         // unbind so we can go back in as the authenticating user
 440         ldap_unbind(ldserver);
 441         return(changed_something);      // tell the caller whether we made any changes
 442 }
 443
 444
 445 // Extract a user's Internet email addresses from LDAP.
 446 // Returns zero if we got a valid set of addresses; nonzero for error.
 447 int extract_email_addresses_from_ldap(char *ldap_dn, char *emailaddrs) {
 448         LDAP *ldserver = NULL;
 449         struct timeval tv;
 450         LDAPMessage *search_result = NULL;
 451         LDAPMessage *entry = NULL;
 452         struct berval **mail;
 453         char *attrs[] = { "*","+",NULL };
 454
 455         if (!ldap_dn) return(1);
 456         if (!emailaddrs) return(1);
 457
 458         ldserver = ctdl_ldap_bind();
 459         if (!ldserver) return(-1);
 460
 461         tv.tv_sec = 10;
 462         tv.tv_usec = 0;
 463
 464         syslog(LOG_DEBUG, "ldap: search: %s", ldap_dn);
 465         syslog(LOG_DEBUG, "ldap: search results: %s", ldap_err2string(ldap_search_ext_s(
 466                 ldserver,                               // ld
 467                 ldap_dn,                                // base
 468                 LDAP_SCOPE_SUBTREE,                     // scope
 469                 NULL,                                   // filter
 470                 attrs,                                  // attrs (all attributes)
 471                 0,                                      // attrsonly (attrs + values)
 472                 NULL,                                   // serverctrls (none)
 473                 NULL,                                   // clientctrls (none)
 474                 &tv,                                    // timeout
 475                 1,                                      // sizelimit (1 result max)
 476                 &search_result                          // res
 477         )));
 478
 479         // Ignore the return value of ldap_search_ext_s().  Sometimes it returns an error even when
 480         // the search succeeds.  Instead, we check to see whether search_result is still NULL.
 481         if (search_result == NULL) {
 482                 syslog(LOG_DEBUG, "ldap: zero search results were returned");
 483                 ldap_unbind(ldserver);
 484                 return(4);
 485         }
 486
 487         // At this point we've got at least one result from our query.
 488         // If there are multiple results, we still only look at the first one.
 489         emailaddrs[0] = 0;                                                              // clear out any previous results
 490         entry = ldap_first_entry(ldserver, search_result);
 491         if (entry) {
 492                 syslog(LOG_DEBUG, "ldap: search got user details");
 493                 mail = ldap_get_values_len(ldserver, search_result, "mail");
 494                 if (mail) {
 495                         int q;
 496                         for (q=0; q<ldap_count_values_len(mail); ++q) {
 497                                 if (IsDirectory(mail[q]->bv_val, 0)) {
 498                                         if ((strlen(emailaddrs) + mail[q]->bv_len + 2) > 512) {
 499                                                 syslog(LOG_ERR, "ldap: can't fit all email addresses into user record");
 500                                         }
 501                                         else {
 502                                                 if (!IsEmptyStr(emailaddrs)) {
 503                                                         strcat(emailaddrs, "|");
 504                                                 }
 505                                                 strcat(emailaddrs, mail[q]->bv_val);
 506                                         }
 507                                 }
 508                         }
 509                 }
 510         }
 511
 512         // free the results
 513         ldap_msgfree(search_result);
 514
 515         // unbind so we can go back in as the authenticating user
 516         ldap_unbind(ldserver);
 517         return(0);
 518 }
 519
 520
 521 // Remember that a particular user exists in the Citadel database.
 522 // As we scan the LDAP tree we will remove users from this list when we find them.
 523 // At the end of the scan, any users remaining in this list are stale and should be deleted.
 524 void ldap_note_user_in_citadel(char *username, void *data) {
 525         return;
 526 }
 527
 528
 529 // Scan LDAP for users and populate Citadel's user database with everyone
 530 //
 531 // POSIX schema:        All objects of class "inetOrgPerson"
 532 // Active Directory:    Objects that are class "user" and class "person" but NOT class "computer"
 533 //
 534 void CtdlSynchronizeUsersFromLDAP(void) {
 535         LDAP *ldserver = NULL;
 536         LDAPMessage *search_result = NULL;
 537         LDAPMessage *entry = NULL;
 538         char *user_dn = NULL;
 539         char searchstring[1024];
 540         struct timeval tv;
 541
 542         if ((CtdlGetConfigInt("c_auth_mode") != AUTHMODE_LDAP) && (CtdlGetConfigInt("c_auth_mode") != AUTHMODE_LDAP_AD)) {
 543                 return;                                         // If this site is not running LDAP, stop here.
 544         }
 545
 546         syslog(LOG_INFO, "ldap: synchronizing Citadel user database from LDAP");
 547
 548         // first, scan the existing Citadel user list
 549         // ForEachUser(ldap_note_user_in_citadel, NULL);        // FIXME finish this
 550
 551         ldserver = ctdl_ldap_bind();
 552         if (!ldserver) return;
 553
 554         tv.tv_sec = 10;
 555         tv.tv_usec = 0;
 556
 557         if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_LDAP_AD) {
 558                         snprintf(searchstring, sizeof(searchstring), "(&(objectClass=user)(objectClass=person)(!(objectClass=computer)))");
 559         }
 560         else {
 561                         snprintf(searchstring, sizeof(searchstring), "(objectClass=inetOrgPerson)");
 562         }
 563
 564         syslog(LOG_DEBUG, "ldap: search: %s", searchstring);
 565         syslog(LOG_DEBUG, "ldap: search results: %s", ldap_err2string(ldap_search_ext_s(
 566                 ldserver,                                       // ld
 567                 CtdlGetConfigStr("c_ldap_base_dn"),             // base
 568                 LDAP_SCOPE_SUBTREE,                             // scope
 569                 searchstring,                                   // filter
 570                 NULL,                                           // attrs (all attributes)
 571                 0,                                              // attrsonly (attrs + values)
 572                 NULL,                                           // serverctrls (none)
 573                 NULL,                                           // clientctrls (none)
 574                 &tv,                                            // timeout
 575                 INT_MAX,                                        // sizelimit (max)
 576                 &search_result                                  // put the result here
 577         )));
 578
 579         // Ignore the return value of ldap_search_ext_s().  Sometimes it returns an error even when
 580         // the search succeeds.  Instead, we check to see whether search_result is still NULL.
 581         if (search_result == NULL) {
 582                 syslog(LOG_DEBUG, "ldap: zero search results were returned");
 583                 ldap_unbind(ldserver);
 584                 return;
 585         }
 586
 587         syslog(LOG_DEBUG, "ldap: %d entries returned", ldap_count_entries(ldserver, search_result));
 588         for (entry=ldap_first_entry(ldserver, search_result); entry!=NULL; entry=ldap_next_entry(ldserver, entry)) {
 589                 user_dn = ldap_get_dn(ldserver, entry);
 590                 if (user_dn) {
 591                         syslog(LOG_DEBUG, "ldap: found %s", user_dn);
 592
 593                         int fullname_size = 256;
 594                         char fullname[256] = { 0 } ;
 595                         uid_t uid = (-1);
 596                         char new_emailaddrs[512] = { 0 } ;
 597
 598                         uid = derive_uid_from_ldap(ldserver, entry);
 599                         derive_fullname_from_ldap_result(fullname, fullname_size, ldserver, entry);
 600                         syslog(LOG_DEBUG, "ldap: display name: <%s> , uid = <%d>", fullname, uid);
 601
 602                         // now create or update the user
 603                         int found_user;
 604                         struct ctdluser usbuf;
 605
 606                         found_user = getuserbyuid(&usbuf, uid);
 607                         if (found_user != 0) {
 608                                 create_user(fullname, CREATE_USER_DO_NOT_BECOME_USER, uid);
 609                                 found_user = getuserbyuid(&usbuf, uid);
 610                                 strcpy(fullname, usbuf.fullname);
 611                         }
 612
 613                         if (found_user == 0) {          // user record exists
 614                                                         // now update the account email addresses if necessary
 615                                 if (CtdlGetConfigInt("c_ldap_sync_email_addrs") > 0) {
 616                                         if (extract_email_addresses_from_ldap(user_dn, new_emailaddrs) == 0) {
 617                                                 if (strcmp(usbuf.emailaddrs, new_emailaddrs)) {                         // update only if changed
 618                                                         CtdlSetEmailAddressesForUser(usbuf.fullname, new_emailaddrs);
 619                                                 }
 620                                         }
 621                                 }
 622                         }
 623                         ldap_memfree(user_dn);
 624                 }
 625         }
 626
 627         // free the results
 628         ldap_msgfree(search_result);
 629
 630         // unbind so we can go back in as the authenticating user
 631         ldap_unbind(ldserver);
 632 }