citadel/ldap.c

   1 /*
   2  * These functions implement the portions of AUTHMODE_LDAP and AUTHMODE_LDAP_AD which
   3  * actually speak to the LDAP server.
   4  *
   5  * Copyright (c) 2011-2014 by the citadel.org development team.
   6  *
   7  * This program is open source software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License, version 3.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 int ctdl_require_ldap_version = 3;
  17
  18 #define _GNU_SOURCE             // Needed to suppress warning about vasprintf() when running on Linux/Linux
  19 #include <stdio.h>
  20 #include <libcitadel.h>
  21 #include "citserver.h"
  22 #include "citadel_ldap.h"
  23 #include "ctdl_module.h"
  24 #include "user_ops.h"
  25
  26 #ifdef HAVE_LDAP
  27 #define LDAP_DEPRECATED 1       /* Suppress libldap's warning that we are using deprecated API calls */
  28 #include <ldap.h>
  29
  30 int CtdlTryUserLDAP(char *username,
  31                 char *found_dn, int found_dn_size,
  32                 char *fullname, int fullname_size,
  33                 uid_t *uid)
  34 {
  35         LDAP *ldserver = NULL;
  36         int i;
  37         LDAPMessage *search_result = NULL;
  38         LDAPMessage *entry = NULL;
  39         char searchstring[1024];
  40         struct timeval tv;
  41         char **values;
  42         char *user_dn = NULL;
  43
  44         if (fullname) safestrncpy(fullname, username, fullname_size);
  45
  46         ldserver = ldap_init(config.c_ldap_host, config.c_ldap_port);
  47         if (ldserver == NULL) {
  48                 syslog(LOG_ALERT, "LDAP: Could not connect to %s:%d : %s",
  49                         config.c_ldap_host, config.c_ldap_port,
  50                         strerror(errno)
  51                 );
  52                 return(errno);
  53         }
  54
  55         ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
  56         ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
  57
  58         striplt(config.c_ldap_bind_dn);
  59         striplt(config.c_ldap_bind_pw);
  60         syslog(LOG_DEBUG, "LDAP bind DN: %s", config.c_ldap_bind_dn);
  61         i = ldap_simple_bind_s(ldserver,
  62                 (!IsEmptyStr(config.c_ldap_bind_dn) ? config.c_ldap_bind_dn : NULL),
  63                 (!IsEmptyStr(config.c_ldap_bind_pw) ? config.c_ldap_bind_pw : NULL)
  64         );
  65         if (i != LDAP_SUCCESS) {
  66                 syslog(LOG_ALERT, "LDAP: Cannot bind: %s (%d)", ldap_err2string(i), i);
  67                 return(i);
  68         }
  69
  70         tv.tv_sec = 10;
  71         tv.tv_usec = 0;
  72
  73         if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
  74                 snprintf(searchstring, sizeof(searchstring), "(sAMAccountName=%s)", username);
  75         }
  76         else {
  77                 snprintf(searchstring, sizeof(searchstring), "(&(objectclass=posixAccount)(uid=%s))", username);
  78         }
  79
  80         syslog(LOG_DEBUG, "LDAP search: %s", searchstring);
  81         (void) ldap_search_ext_s(
  82                 ldserver,                                       /* ld                           */
  83                 config.c_ldap_base_dn,                          /* base                         */
  84                 LDAP_SCOPE_SUBTREE,                             /* scope                        */
  85                 searchstring,                                   /* filter                       */
  86                 NULL,                                           /* attrs (all attributes)       */
  87                 0,                                              /* attrsonly (attrs + values)   */
  88                 NULL,                                           /* serverctrls (none)           */
  89                 NULL,                                           /* clientctrls (none)           */
  90                 &tv,                                            /* timeout                      */
  91                 1,                                              /* sizelimit (1 result max)     */
  92                 &search_result                                  /* res                          */
  93         );
  94
  95         /* Ignore the return value of ldap_search_ext_s().  Sometimes it returns an error even when
  96          * the search succeeds.  Instead, we check to see whether search_result is still NULL.
  97          */
  98         if (search_result == NULL) {
  99                 syslog(LOG_DEBUG, "LDAP search: zero results were returned");
 100                 ldap_unbind(ldserver);
 101                 return(2);
 102         }
 103
 104         /* At this point we've got at least one result from our query.  If there are multiple
 105          * results, we still only look at the first one.
 106          */
 107         entry = ldap_first_entry(ldserver, search_result);
 108         if (entry) {
 109
 110                 user_dn = ldap_get_dn(ldserver, entry);
 111                 if (user_dn) {
 112                         syslog(LOG_DEBUG, "dn = %s", user_dn);
 113                 }
 114
 115                 if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 116                         values = ldap_get_values(ldserver, search_result, "displayName");
 117                         if (values) {
 118                                 if (values[0]) {
 119                                         if (fullname) safestrncpy(fullname, values[0], fullname_size);
 120                                         syslog(LOG_DEBUG, "displayName = %s", values[0]);
 121                                 }
 122                                 ldap_value_free(values);
 123                         }
 124                 }
 125                 else {
 126                         values = ldap_get_values(ldserver, search_result, "cn");
 127                         if (values) {
 128                                 if (values[0]) {
 129                                         if (fullname) safestrncpy(fullname, values[0], fullname_size);
 130                                         syslog(LOG_DEBUG, "cn = %s", values[0]);
 131                                 }
 132                                 ldap_value_free(values);
 133                         }
 134                 }
 135
 136                 if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 137                         values = ldap_get_values(ldserver, search_result, "objectGUID");
 138                         if (values) {
 139                                 if (values[0]) {
 140                                         if (uid != NULL) {
 141                                                 *uid = abs(HashLittle(values[0], strlen(values[0])));
 142                                                 syslog(LOG_DEBUG, "uid hashed from objectGUID = %d", *uid);
 143                                         }
 144                                 }
 145                                 ldap_value_free(values);
 146                         }
 147                 }
 148                 else {
 149                         values = ldap_get_values(ldserver, search_result, "uidNumber");
 150                         if (values) {
 151                                 if (values[0]) {
 152                                         syslog(LOG_DEBUG, "uidNumber = %s", values[0]);
 153                                         if (uid != NULL) {
 154                                                 *uid = atoi(values[0]);
 155                                         }
 156                                 }
 157                                 ldap_value_free(values);
 158                         }
 159                 }
 160
 161         }
 162
 163         /* free the results */
 164         ldap_msgfree(search_result);
 165
 166         /* unbind so we can go back in as the authenticating user */
 167         ldap_unbind(ldserver);
 168
 169         if (!user_dn) {
 170                 syslog(LOG_DEBUG, "No such user was found.");
 171                 return(4);
 172         }
 173
 174         if (found_dn) safestrncpy(found_dn, user_dn, found_dn_size);
 175         ldap_memfree(user_dn);
 176         return(0);
 177 }
 178
 179
 180 int CtdlTryPasswordLDAP(char *user_dn, const char *password)
 181 {
 182         LDAP *ldserver = NULL;
 183         int i = (-1);
 184
 185         if (IsEmptyStr(password)) {
 186                 syslog(LOG_DEBUG, "LDAP: empty passwords are not permitted");
 187                 return(1);
 188         }
 189
 190         syslog(LOG_DEBUG, "LDAP: trying to bind as %s", user_dn);
 191         ldserver = ldap_init(config.c_ldap_host, config.c_ldap_port);
 192         if (ldserver) {
 193                 ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
 194                 i = ldap_simple_bind_s(ldserver, user_dn, password);
 195                 if (i == LDAP_SUCCESS) {
 196                         syslog(LOG_DEBUG, "LDAP: bind succeeded");
 197                 }
 198                 else {
 199                         syslog(LOG_DEBUG, "LDAP: Cannot bind: %s (%d)", ldap_err2string(i), i);
 200                 }
 201                 ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
 202                 ldap_unbind(ldserver);
 203         }
 204
 205         if (i == LDAP_SUCCESS) {
 206                 return(0);
 207         }
 208
 209         return(1);
 210 }
 211
 212 //return !0 iff property changed.
 213 int vcard_set_props_iff_different(struct vCard *v,char *propname,int numvals, char **vals) {
 214         int i;
 215         char *oldval;
 216         for(i=0;i<numvals;i++) {
 217           oldval = vcard_get_prop(v,propname,0,i,0);
 218           if (oldval == NULL) break;
 219           if (strcmp(vals[i],oldval)) break;
 220         }
 221         if (i!=numvals) {
 222                 for(i=0;i<numvals;i++) vcard_set_prop(v,propname,vals[i],(i==0) ? 0 : 1);
 223                 return 1;
 224         }
 225         return 0;
 226 }
 227
 228
 229 //return !0 iff property changed.
 230 int vcard_set_one_prop_iff_different(struct vCard *v,char *propname, char *newfmt, ...) {
 231         va_list args;
 232         char *newvalue;
 233         int changed_something;
 234         va_start(args,newfmt);
 235         if (-1==vasprintf(&newvalue,newfmt,args)) {
 236                 syslog(LOG_ALERT, "Out of memory!\n");
 237                 return 0;
 238         }
 239         changed_something = vcard_set_props_iff_different(v,propname,1,&newvalue);
 240         va_end(args);
 241         free(newvalue);
 242         return changed_something;
 243 }
 244
 245 /*
 246  * Learn LDAP attributes and stuff them into the vCard.
 247  * Returns nonzero if we changed anything.
 248  */
 249 int Ctdl_LDAP_to_vCard(char *ldap_dn, struct vCard *v)
 250 {
 251         int changed_something = 0;
 252         LDAP *ldserver = NULL;
 253         int i;
 254         struct timeval tv;
 255         LDAPMessage *search_result = NULL;
 256         LDAPMessage *entry = NULL;
 257         char **givenName;
 258         char **sn;
 259         char **cn;
 260         char **initials;
 261         char **o;
 262         char **street;
 263         char **l;
 264         char **st;
 265         char **postalCode;
 266         char **telephoneNumber;
 267         char **mobile;
 268         char **homePhone;
 269         char **facsimileTelephoneNumber;
 270         char **mail;
 271         char **uid;
 272         char **homeDirectory;
 273         char **uidNumber;
 274         char **loginShell;
 275         char **gidNumber;
 276         char **c;
 277         char **title;
 278         char **uuid;
 279         char *attrs[] = { "*","+",NULL};
 280
 281         if (!ldap_dn) return(0);
 282         if (!v) return(0);
 283         ldserver = ldap_init(config.c_ldap_host, config.c_ldap_port);
 284         if (ldserver == NULL) {
 285                 syslog(LOG_ALERT, "LDAP: Could not connect to %s:%d : %s",
 286                         config.c_ldap_host, config.c_ldap_port,
 287                         strerror(errno)
 288                 );
 289                 return(0);
 290         }
 291
 292         ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
 293         ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
 294
 295         striplt(config.c_ldap_bind_dn);
 296         striplt(config.c_ldap_bind_pw);
 297         syslog(LOG_DEBUG, "LDAP bind DN: %s", config.c_ldap_bind_dn);
 298         i = ldap_simple_bind_s(ldserver,
 299                 (!IsEmptyStr(config.c_ldap_bind_dn) ? config.c_ldap_bind_dn : NULL),
 300                 (!IsEmptyStr(config.c_ldap_bind_pw) ? config.c_ldap_bind_pw : NULL)
 301         );
 302         if (i != LDAP_SUCCESS) {
 303                 syslog(LOG_ALERT, "LDAP: Cannot bind: %s (%d)", ldap_err2string(i), i);
 304                 return(0);
 305         }
 306
 307         tv.tv_sec = 10;
 308         tv.tv_usec = 0;
 309
 310         syslog(LOG_DEBUG, "LDAP search: %s", ldap_dn);
 311         (void) ldap_search_ext_s(
 312                 ldserver,                               /* ld                           */
 313                 ldap_dn,                                /* base                         */
 314                 LDAP_SCOPE_SUBTREE,             /* scope                        */
 315                 NULL,                                   /* filter                       */
 316                 attrs,                                  /* attrs (all attributes)       */
 317                 0,                                              /* attrsonly (attrs + values)   */
 318                 NULL,                                   /* serverctrls (none)           */
 319                 NULL,                                   /* clientctrls (none)           */
 320                 &tv,                                    /* timeout                      */
 321                 1,                                              /* sizelimit (1 result max)     */
 322                 &search_result                  /* res                          */
 323         );
 324
 325         /* Ignore the return value of ldap_search_ext_s().  Sometimes it returns an error even when
 326          * the search succeeds.  Instead, we check to see whether search_result is still NULL.
 327          */
 328
 329         if (search_result == NULL) {
 330                 syslog(LOG_DEBUG, "LDAP search: zero results were returned");
 331                 ldap_unbind(ldserver);
 332                 return(0);
 333         }
 334
 335         /* At this point we've got at least one result from our query.  If there are multiple
 336          * results, we still only look at the first one.
 337          */
 338
 339         entry = ldap_first_entry(ldserver, search_result);
 340         if (entry) {
 341                 syslog(LOG_DEBUG, "LDAP search, got user details for vcard.");
 342                 givenName=ldap_get_values(ldserver, search_result, "givenName");
 343                 sn=ldap_get_values(ldserver, search_result, "sn");
 344                 cn=ldap_get_values(ldserver, search_result, "cn");
 345                 initials=ldap_get_values(ldserver, search_result, "initials");
 346                 title=ldap_get_values(ldserver, search_result, "title");
 347                 o=ldap_get_values(ldserver, search_result, "o");
 348                 street=ldap_get_values(ldserver, search_result, "street");
 349                 l=ldap_get_values(ldserver, search_result, "l");
 350                 st=ldap_get_values(ldserver, search_result, "st");
 351                 postalCode=ldap_get_values(ldserver, search_result, "postalCode");
 352                 telephoneNumber=ldap_get_values(ldserver, search_result, "telephoneNumber");
 353                 mobile=ldap_get_values(ldserver, search_result, "mobile");
 354                 homePhone=ldap_get_values(ldserver, search_result, "homePhone");
 355                 facsimileTelephoneNumber=ldap_get_values(ldserver, search_result, "facsimileTelephoneNumber");
 356                 mail=ldap_get_values(ldserver, search_result, "mail");
 357                 uid=ldap_get_values(ldserver, search_result, "uid");
 358                 homeDirectory=ldap_get_values(ldserver, search_result, "homeDirectory");
 359                 uidNumber=ldap_get_values(ldserver, search_result, "uidNumber");
 360                 loginShell=ldap_get_values(ldserver, search_result, "loginShell");
 361                 gidNumber=ldap_get_values(ldserver, search_result, "gidNumber");
 362                 c=ldap_get_values(ldserver, search_result, "c");
 363                 uuid=ldap_get_values(ldserver, search_result, "entryUUID");
 364
 365                 if (street && l && st && postalCode && c) changed_something |= vcard_set_one_prop_iff_different(v,"adr",";;%s;%s;%s;%s;%s",street[0],l[0],st[0],postalCode[0],c[0]);
 366                 if (telephoneNumber) changed_something |= vcard_set_one_prop_iff_different(v,"tel;work","%s",telephoneNumber[0]);
 367                 if (facsimileTelephoneNumber) changed_something |= vcard_set_one_prop_iff_different(v,"tel;fax","%s",facsimileTelephoneNumber[0]);
 368                 if (mobile) changed_something |= vcard_set_one_prop_iff_different(v,"tel;cell","%s",mobile[0]);
 369                 if (homePhone) changed_something |= vcard_set_one_prop_iff_different(v,"tel;home","%s",homePhone[0]);
 370                 if (givenName && sn) {
 371                         if (initials) {
 372                                 changed_something |= vcard_set_one_prop_iff_different(v,"n","%s;%s;%s",sn[0],givenName[0],initials[0]);
 373                         }
 374                         else {
 375                                 changed_something |= vcard_set_one_prop_iff_different(v,"n","%s;%s",sn[0],givenName[0]);
 376                         }
 377                 }
 378                 if (mail) {
 379                         changed_something |= vcard_set_props_iff_different(v,"email;internet",ldap_count_values(mail),mail);
 380                 }
 381                 if (uuid) changed_something |= vcard_set_one_prop_iff_different(v,"uid","%s",uuid[0]);
 382                 if (o) changed_something |= vcard_set_one_prop_iff_different(v,"org","%s",o[0]);
 383                 if (cn) changed_something |= vcard_set_one_prop_iff_different(v,"fn","%s",cn[0]);
 384                 if (title) changed_something |= vcard_set_one_prop_iff_different(v,"title","%s",title[0]);
 385
 386                 if (givenName) ldap_value_free(givenName);
 387                 if (initials) ldap_value_free(initials);
 388                 if (sn) ldap_value_free(sn);
 389                 if (cn) ldap_value_free(cn);
 390                 if (o) ldap_value_free(o);
 391                 if (street) ldap_value_free(street);
 392                 if (l) ldap_value_free(l);
 393                 if (st) ldap_value_free(st);
 394                 if (postalCode) ldap_value_free(postalCode);
 395                 if (telephoneNumber) ldap_value_free(telephoneNumber);
 396                 if (mobile) ldap_value_free(mobile);
 397                 if (homePhone) ldap_value_free(homePhone);
 398                 if (facsimileTelephoneNumber) ldap_value_free(facsimileTelephoneNumber);
 399                 if (mail) ldap_value_free(mail);
 400                 if (uid) ldap_value_free(uid);
 401                 if (homeDirectory) ldap_value_free(homeDirectory);
 402                 if (uidNumber) ldap_value_free(uidNumber);
 403                 if (loginShell) ldap_value_free(loginShell);
 404                 if (gidNumber) ldap_value_free(gidNumber);
 405                 if (c) ldap_value_free(c);
 406                 if (title) ldap_value_free(title);
 407                 if (uuid) ldap_value_free(uuid);
 408         }
 409         /* free the results */
 410         ldap_msgfree(search_result);
 411
 412         /* unbind so we can go back in as the authenticating user */
 413         ldap_unbind(ldserver);
 414
 415         return(changed_something);      /* tell the caller whether we made any changes */
 416 }
 417
 418 #endif /* HAVE_LDAP */