+++ /dev/null
-// These functions implement the portions of AUTHMODE_LDAP and AUTHMODE_LDAP_AD which
-// actually speak to the LDAP server.
-//
-// Copyright (c) 2011-2022 by the citadel.org development team.
-//
-// This program is open source software; you can redistribute it and/or modify
-// it under the terms of the GNU General Public License, version 3.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-int ctdl_require_ldap_version = 3;
-
-#define _GNU_SOURCE // Needed to suppress warning about vasprintf() when running on Linux/Linux
-#include <stdio.h>
-#include <libcitadel.h>
-#include "citserver.h"
-#include "citadel_ldap.h"
-#include "ctdl_module.h"
-#include "user_ops.h"
-#include "internet_addressing.h"
-#include "config.h"
-#include <ldap.h>
-
-
-// Utility function, supply a search result and get back the fullname (display name, common name, etc) from the first result
-void derive_fullname_from_ldap_result(char *fullname, int fullname_size, LDAP *ldserver, LDAPMessage *search_result) {
- char **values;
-
- if (fullname == NULL) return;
- if (search_result == NULL) return;
- if (ldserver == NULL) return;
-
- if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_LDAP_AD) {
- values = ldap_get_values(ldserver, search_result, "displayName");
- if (values) {
- if (values[0]) {
- if (fullname) safestrncpy(fullname, values[0], fullname_size);
- syslog(LOG_DEBUG, "ldap: displayName = %s", values[0]);
- }
- ldap_value_free(values);
- }
- }
- else {
- values = ldap_get_values(ldserver, search_result, "cn");
- if (values) {
- if (values[0]) {
- if (fullname) safestrncpy(fullname, values[0], fullname_size);
- syslog(LOG_DEBUG, "ldap: cn = %s", values[0]);
- }
- ldap_value_free(values);
- }
- }
-}
-
-
-// Utility function, supply a search result and get back the uid from the first result
-uid_t derive_uid_from_ldap(LDAP *ldserver, LDAPMessage *entry) {
- struct berval **values;
- uid_t uid = (-1);
-
- if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_LDAP_AD) {
- values = ldap_get_values_len(ldserver, entry, "objectGUID"); // AD schema: uid hashed from objectGUID
- if (values) {
- if (ldap_count_values_len(values) > 0) {
- uid = abs(HashLittle(values[0]->bv_val, values[0]->bv_len));
- }
- ldap_value_free(Xvalues);
- }
- }
- else {
- values = ldap_get_values_len(ldserver, entry, "uidNumber"); // POSIX schema: uid = uidNumber
- if (values) {
- if (ldap_count_values_len(values) > 0) {
- uid = atoi(values[0]->bv_val);
- }
- ldap_value_free_len(values);
- }
- }
-
- syslog(LOG_DEBUG, "ldap: uid = %d", uid);
- return(uid);
-}
-
-
-// Wrapper function for ldap_initialize() that consistently fills in the correct fields
-int ctdl_ldap_initialize(LDAP **ld) {
-
- char server_url[256];
- int ret;
-
- snprintf(server_url, sizeof server_url, "ldap://%s:%d", CtdlGetConfigStr("c_ldap_host"), CtdlGetConfigInt("c_ldap_port"));
- ret = ldap_initialize(ld, server_url);
- if (ret != LDAP_SUCCESS) {
- syslog(LOG_ERR, "ldap: could not connect to %s : %m", server_url);
- *ld = NULL;
- return(errno);
- }
-
- return(ret);
-}
-
-
-// Bind to the LDAP server and return a working handle
-LDAP *ctdl_ldap_bind(void) {
- LDAP *ldserver = NULL;
- int i;
-
- if (ctdl_ldap_initialize(&ldserver) != LDAP_SUCCESS) {
- return(NULL);
- }
-
- ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
- ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
-
- striplt(CtdlGetConfigStr("c_ldap_bind_dn"));
- striplt(CtdlGetConfigStr("c_ldap_bind_pw"));
- i = ldap_simple_bind_s(ldserver,
- (!IsEmptyStr(CtdlGetConfigStr("c_ldap_bind_dn")) ? CtdlGetConfigStr("c_ldap_bind_dn") : NULL),
- (!IsEmptyStr(CtdlGetConfigStr("c_ldap_bind_pw")) ? CtdlGetConfigStr("c_ldap_bind_pw") : NULL)
- );
- if (i != LDAP_SUCCESS) {
- syslog(LOG_ERR, "ldap: Cannot bind: %s (%d)", ldap_err2string(i), i);
- return(NULL);
- }
-
- return(ldserver);
-}
-
-
-// Look up a user in the directory to see if this is an account that can be authenticated
-int CtdlTryUserLDAP(char *username, char *found_dn, int found_dn_size, char *fullname, int fullname_size, uid_t *uid) {
- LDAP *ldserver = NULL;
- LDAPMessage *search_result = NULL;
- LDAPMessage *entry = NULL;
- char searchstring[1024];
- struct timeval tv;
- char *user_dn = NULL;
-
- ldserver = ctdl_ldap_bind();
- if (!ldserver) return(-1);
-
- if (fullname) safestrncpy(fullname, username, fullname_size);
- tv.tv_sec = 10;
- tv.tv_usec = 0;
-
- if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_LDAP_AD) {
- snprintf(searchstring, sizeof(searchstring), "(sAMAccountName=%s)", username);
- }
- else {
- snprintf(searchstring, sizeof(searchstring), "(&(objectclass=posixAccount)(cn=%s))", username);
- // snprintf(searchstring, sizeof(searchstring), "(&(objectclass=posixAccount)(uid=%s))", username);
- }
-
- syslog(LOG_DEBUG, "ldap: search: %s", searchstring);
- syslog(LOG_DEBUG, "ldap: search results: %s", ldap_err2string(ldap_search_ext_s(
- ldserver, // ld
- CtdlGetConfigStr("c_ldap_base_dn"), // base
- LDAP_SCOPE_SUBTREE, // scope
- searchstring, // filter
- NULL, // attrs (all attributes)
- 0, // attrsonly (attrs + values)
- NULL, // serverctrls (none)
- NULL, // clientctrls (none)
- &tv, // timeout
- 1, // sizelimit (1 result max)
- &search_result // res
- )));
-
- // Ignore the return value of ldap_search_ext_s(). Sometimes it returns an error even when
- // the search succeeds. Instead, we check to see whether search_result is still NULL.
- if (search_result == NULL) {
- syslog(LOG_DEBUG, "ldap: zero search results were returned");
- ldap_unbind(ldserver);
- return(2);
- }
-
- // At this point we've got at least one result from our query. If there are multiple
- // results, we still only look at the first one.
- entry = ldap_first_entry(ldserver, search_result);
- if (entry) {
-
- user_dn = ldap_get_dn(ldserver, entry);
- if (user_dn) {
- syslog(LOG_DEBUG, "ldap: dn = %s", user_dn);
- }
-
- derive_fullname_from_ldap_result(fullname, fullname_size, ldserver, search_result);
- *uid = derive_uid_from_ldap(ldserver, search_result);
- }
-
- // free the results
- ldap_msgfree(search_result);
-
- // unbind so we can go back in as the authenticating user
- ldap_unbind(ldserver);
-
- if (!user_dn) {
- syslog(LOG_DEBUG, "ldap: No such user was found.");
- return(4);
- }
-
- if (found_dn) safestrncpy(found_dn, user_dn, found_dn_size);
- ldap_memfree(user_dn);
- return(0);
-}
-
-
-int CtdlTryPasswordLDAP(char *user_dn, const char *password) {
- LDAP *ldserver = NULL;
- int i = (-1);
-
- if (IsEmptyStr(password)) {
- syslog(LOG_DEBUG, "ldap: empty passwords are not permitted");
- return(1);
- }
-
- syslog(LOG_DEBUG, "ldap: trying to bind as %s", user_dn);
- i = ctdl_ldap_initialize(&ldserver);
- if (i == LDAP_SUCCESS) {
- ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
- i = ldap_simple_bind_s(ldserver, user_dn, password);
- if (i == LDAP_SUCCESS) {
- syslog(LOG_DEBUG, "ldap: bind succeeded");
- }
- else {
- syslog(LOG_DEBUG, "ldap: Cannot bind: %s (%d)", ldap_err2string(i), i);
- }
- ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
- ldap_unbind(ldserver);
- }
-
- if (i == LDAP_SUCCESS) {
- return(0);
- }
-
- return(1);
-}
-
-
-//return !0 iff property changed.
-int vcard_set_props_iff_different(struct vCard *v,char *propname,int numvals, char **vals) {
- int i;
- char *oldval = "";
- for(i=0;i<numvals;i++) {
- oldval = vcard_get_prop(v,propname,0,i,0);
- if (oldval == NULL) break;
- if (strcmp(vals[i],oldval)) break;
- }
- if (i!=numvals) {
- syslog(LOG_DEBUG, "ldap: vcard property %s, element %d of %d changed from %s to %s\n", propname, i, numvals, oldval, vals[i]);
- for(i=0;i<numvals;i++) vcard_set_prop(v,propname,vals[i],(i==0) ? 0 : 1);
- return 1;
- }
- return 0;
-}
-
-
-//return !0 iff property changed.
-int vcard_set_one_prop_iff_different(struct vCard *v,char *propname, char *newfmt, ...) {
- va_list args;
- char *newvalue;
- int changed_something;
- va_start(args,newfmt);
- if (-1==vasprintf(&newvalue,newfmt,args)) {
- syslog(LOG_ERR, "ldap: out of memory!");
- return 0;
- }
- changed_something = vcard_set_props_iff_different(v,propname,1,&newvalue);
- va_end(args);
- free(newvalue);
- return changed_something;
-}
-
-
-// Learn LDAP attributes and stuff them into the vCard.
-// Returns nonzero if we changed anything.
-int Ctdl_LDAP_to_vCard(char *ldap_dn, struct vCard *v) {
- int changed_something = 0;
- LDAP *ldserver = NULL;
- struct timeval tv;
- LDAPMessage *search_result = NULL;
- LDAPMessage *entry = NULL;
- char **givenName;
- char **sn;
- char **cn;
- char **initials;
- char **o;
- char **street;
- char **l;
- char **st;
- char **postalCode;
- char **telephoneNumber;
- char **mobile;
- char **homePhone;
- char **facsimileTelephoneNumber;
- char **mail;
- char **uid;
- char **homeDirectory;
- char **uidNumber;
- char **loginShell;
- char **gidNumber;
- char **c;
- char **title;
- char **uuid;
- char *attrs[] = { "*","+",NULL};
-
- if (!ldap_dn) return(0);
- if (!v) return(0);
-
- ldserver = ctdl_ldap_bind();
- if (!ldserver) return(-1);
-
- tv.tv_sec = 10;
- tv.tv_usec = 0;
-
- syslog(LOG_DEBUG, "ldap: search: %s", ldap_dn);
- syslog(LOG_DEBUG, "ldap: search results: %s", ldap_err2string(ldap_search_ext_s(
- ldserver, // ld
- ldap_dn, // base
- LDAP_SCOPE_SUBTREE, // scope
- NULL, // filter
- attrs, // attrs (all attributes)
- 0, // attrsonly (attrs + values)
- NULL, // serverctrls (none)
- NULL, // clientctrls (none)
- &tv, // timeout
- 1, // sizelimit (1 result max)
- &search_result // res
- )));
-
- // Ignore the return value of ldap_search_ext_s(). Sometimes it returns an error even when
- // the search succeeds. Instead, we check to see whether search_result is still NULL.
- if (search_result == NULL) {
- syslog(LOG_DEBUG, "ldap: zero search results were returned");
- ldap_unbind(ldserver);
- return(0);
- }
-
- // At this point we've got at least one result from our query. If there are multiple
- // results, we still only look at the first one.
- entry = ldap_first_entry(ldserver, search_result);
- if (entry) {
- syslog(LOG_DEBUG, "ldap: search got user details for vcard.");
- givenName=ldap_get_values(ldserver, search_result, "givenName");
- sn=ldap_get_values(ldserver, search_result, "sn");
- cn=ldap_get_values(ldserver, search_result, "cn");
- initials=ldap_get_values(ldserver, search_result, "initials");
- title=ldap_get_values(ldserver, search_result, "title");
- o=ldap_get_values(ldserver, search_result, "o");
- street=ldap_get_values(ldserver, search_result, "street");
- l=ldap_get_values(ldserver, search_result, "l");
- st=ldap_get_values(ldserver, search_result, "st");
- postalCode=ldap_get_values(ldserver, search_result, "postalCode");
- telephoneNumber=ldap_get_values(ldserver, search_result, "telephoneNumber");
- mobile=ldap_get_values(ldserver, search_result, "mobile");
- homePhone=ldap_get_values(ldserver, search_result, "homePhone");
- facsimileTelephoneNumber=ldap_get_values(ldserver, search_result, "facsimileTelephoneNumber");
- mail=ldap_get_values(ldserver, search_result, "mail");
- uid=ldap_get_values(ldserver, search_result, "uid");
- homeDirectory=ldap_get_values(ldserver, search_result, "homeDirectory");
- uidNumber=ldap_get_values(ldserver, search_result, "uidNumber");
- loginShell=ldap_get_values(ldserver, search_result, "loginShell");
- gidNumber=ldap_get_values(ldserver, search_result, "gidNumber");
- c=ldap_get_values(ldserver, search_result, "c");
- uuid=ldap_get_values(ldserver, search_result, "entryUUID");
-
- 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]);
- if (telephoneNumber) changed_something |= vcard_set_one_prop_iff_different(v,"tel;work","%s",telephoneNumber[0]);
- if (facsimileTelephoneNumber) changed_something |= vcard_set_one_prop_iff_different(v,"tel;fax","%s",facsimileTelephoneNumber[0]);
- if (mobile) changed_something |= vcard_set_one_prop_iff_different(v,"tel;cell","%s",mobile[0]);
- if (homePhone) changed_something |= vcard_set_one_prop_iff_different(v,"tel;home","%s",homePhone[0]);
- if (givenName && sn) {
- if (initials) {
- changed_something |= vcard_set_one_prop_iff_different(v,"n","%s;%s;%s",sn[0],givenName[0],initials[0]);
- }
- else {
- changed_something |= vcard_set_one_prop_iff_different(v,"n","%s;%s",sn[0],givenName[0]);
- }
- }
- if (mail) {
- changed_something |= vcard_set_props_iff_different(v,"email;internet",ldap_count_values(mail),mail);
- }
- if (uuid) changed_something |= vcard_set_one_prop_iff_different(v,"X-uuid","%s",uuid[0]);
- if (o) changed_something |= vcard_set_one_prop_iff_different(v,"org","%s",o[0]);
- if (cn) changed_something |= vcard_set_one_prop_iff_different(v,"fn","%s",cn[0]);
- if (title) changed_something |= vcard_set_one_prop_iff_different(v,"title","%s",title[0]);
-
- if (givenName) ldap_value_free(givenName);
- if (initials) ldap_value_free(initials);
- if (sn) ldap_value_free(sn);
- if (cn) ldap_value_free(cn);
- if (o) ldap_value_free(o);
- if (street) ldap_value_free(street);
- if (l) ldap_value_free(l);
- if (st) ldap_value_free(st);
- if (postalCode) ldap_value_free(postalCode);
- if (telephoneNumber) ldap_value_free(telephoneNumber);
- if (mobile) ldap_value_free(mobile);
- if (homePhone) ldap_value_free(homePhone);
- if (facsimileTelephoneNumber) ldap_value_free(facsimileTelephoneNumber);
- if (mail) ldap_value_free(mail);
- if (uid) ldap_value_free(uid);
- if (homeDirectory) ldap_value_free(homeDirectory);
- if (uidNumber) ldap_value_free(uidNumber);
- if (loginShell) ldap_value_free(loginShell);
- if (gidNumber) ldap_value_free(gidNumber);
- if (c) ldap_value_free(c);
- if (title) ldap_value_free(title);
- if (uuid) ldap_value_free(uuid);
- }
- // free the results
- ldap_msgfree(search_result);
-
- // unbind so we can go back in as the authenticating user
- ldap_unbind(ldserver);
- return(changed_something); // tell the caller whether we made any changes
-}
-
-
-// Extract a user's Internet email addresses from LDAP.
-// Returns zero if we got a valid set of addresses; nonzero for error.
-int extract_email_addresses_from_ldap(char *ldap_dn, char *emailaddrs) {
- LDAP *ldserver = NULL;
- struct timeval tv;
- LDAPMessage *search_result = NULL;
- LDAPMessage *entry = NULL;
- char **mail;
- char *attrs[] = { "*","+",NULL};
-
- if (!ldap_dn) return(1);
- if (!emailaddrs) return(1);
-
- ldserver = ctdl_ldap_bind();
- if (!ldserver) return(-1);
-
- tv.tv_sec = 10;
- tv.tv_usec = 0;
-
- syslog(LOG_DEBUG, "ldap: search: %s", ldap_dn);
- syslog(LOG_DEBUG, "ldap: search results: %s", ldap_err2string(ldap_search_ext_s(
- ldserver, // ld
- ldap_dn, // base
- LDAP_SCOPE_SUBTREE, // scope
- NULL, // filter
- attrs, // attrs (all attributes)
- 0, // attrsonly (attrs + values)
- NULL, // serverctrls (none)
- NULL, // clientctrls (none)
- &tv, // timeout
- 1, // sizelimit (1 result max)
- &search_result // res
- )));
-
- // Ignore the return value of ldap_search_ext_s(). Sometimes it returns an error even when
- // the search succeeds. Instead, we check to see whether search_result is still NULL.
- if (search_result == NULL) {
- syslog(LOG_DEBUG, "ldap: zero search results were returned");
- ldap_unbind(ldserver);
- return(4);
- }
-
- // At this point we've got at least one result from our query. If there are multiple
- // results, we still only look at the first one.
- emailaddrs[0] = 0; // clear out any previous results
- entry = ldap_first_entry(ldserver, search_result);
- if (entry) {
- syslog(LOG_DEBUG, "ldap: search got user details");
- mail = ldap_get_values(ldserver, search_result, "mail");
-
- if (mail) {
- int q;
- for (q=0; q<ldap_count_values(mail); ++q) {
- if (IsDirectory(mail[q], 0)) {
- if ((strlen(emailaddrs) + strlen(mail[q]) + 2) > 512) {
- syslog(LOG_ERR, "ldap: can't fit all email addresses into user record");
- }
- else {
- if (!IsEmptyStr(emailaddrs)) {
- strcat(emailaddrs, "|");
- }
- strcat(emailaddrs, mail[q]);
- }
- }
- }
- }
- }
-
- // free the results
- ldap_msgfree(search_result);
-
- // unbind so we can go back in as the authenticating user
- ldap_unbind(ldserver);
- return(0);
-}
-
-
-// Scan LDAP for users and populate Citadel's user database with everyone
-void CtdlSynchronizeUsersFromLDAP(void) {
- LDAP *ldserver = NULL;
- LDAPMessage *search_result = NULL;
- LDAPMessage *entry = NULL;
- char *user_dn = NULL;
- char searchstring[1024];
- struct timeval tv;
-
- if ((CtdlGetConfigInt("c_auth_mode") != AUTHMODE_LDAP) && (CtdlGetConfigInt("c_auth_mode") != AUTHMODE_LDAP_AD)) {
- return; // not running LDAP
- }
-
- syslog(LOG_INFO, "ldap: synchronizing Citadel user database from LDAP");
-
- ldserver = ctdl_ldap_bind();
- if (!ldserver) return;
-
- tv.tv_sec = 10;
- tv.tv_usec = 0;
-
- if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_LDAP_AD) {
- snprintf(searchstring, sizeof(searchstring), "(&(objectClass=user)(objectClass=person)(!(objectClass=computer)))");
- }
- else {
- snprintf(searchstring, sizeof(searchstring), "(objectClass=inetOrgPerson)");
- }
-
- syslog(LOG_DEBUG, "ldap: search: %s", searchstring);
- syslog(LOG_DEBUG, "ldap: search results: %s", ldap_err2string(ldap_search_ext_s(
- ldserver, // ld
- CtdlGetConfigStr("c_ldap_base_dn"), // base
- LDAP_SCOPE_SUBTREE, // scope
- searchstring, // filter
- NULL, // attrs (all attributes)
- 0, // attrsonly (attrs + values)
- NULL, // serverctrls (none)
- NULL, // clientctrls (none)
- &tv, // timeout
- INT_MAX, // sizelimit (max)
- &search_result // result
- )));
-
- // Ignore the return value of ldap_search_ext_s(). Sometimes it returns an error even when
- // the search succeeds. Instead, we check to see whether search_result is still NULL.
- if (search_result == NULL) {
- syslog(LOG_DEBUG, "ldap: zero search results were returned");
- ldap_unbind(ldserver);
- return;
- }
-
- syslog(LOG_DEBUG, "ldap: %d entries returned", ldap_count_entries(ldserver, search_result));
- for (entry=ldap_first_entry(ldserver, search_result); entry!=NULL; entry=ldap_next_entry(ldserver, entry)) {
- user_dn = ldap_get_dn(ldserver, entry);
- if (user_dn) {
- syslog(LOG_DEBUG, "ldap: found %s", user_dn);
-
- int fullname_size = 256;
- char fullname[256] = { 0 } ;
- uid_t uid = (-1);
- char new_emailaddrs[512] = { 0 } ;
-
- uid = derive_uid_from_ldap(ldserver, entry);
- derive_fullname_from_ldap_result(fullname, fullname_size, ldserver, entry);
- syslog(LOG_DEBUG, "ldap: display name: <%s> , uid = <%d>", fullname, uid);
-
- // now create or update the user
- int found_user;
- struct ctdluser usbuf;
-
- found_user = getuserbyuid(&usbuf, uid);
- if (found_user != 0) {
- create_user(fullname, CREATE_USER_DO_NOT_BECOME_USER, uid);
- found_user = getuserbyuid(&usbuf, uid);
- strcpy(fullname, usbuf.fullname);
- }
-
- if (found_user == 0) { // user record exists
- // now update the account email addresses if necessary
- if (CtdlGetConfigInt("c_ldap_sync_email_addrs") > 0) {
- if (extract_email_addresses_from_ldap(user_dn, new_emailaddrs) == 0) {
- if (strcmp(usbuf.emailaddrs, new_emailaddrs)) { // update only if changed
- CtdlSetEmailAddressesForUser(usbuf.fullname, new_emailaddrs);
- }
- }
- }
- }
- ldap_memfree(user_dn);
- }
- }
-
- // free the results
- ldap_msgfree(search_result);
-
- // unbind so we can go back in as the authenticating user
- ldap_unbind(ldserver);
-}
projects / citadel.git / blobdiff