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/* Copyright 2017 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
// Need to link to ldap libraries -lldap
#include <ldap.h>
#include "ldap_lookup.h"
#include "framework_utils.h"
#define FILTER_BUFFER_SIZE 128
extern FILE* messageFile;
// Returns the number of results, sets *employeeId to the serial number of the first result
int ldapLookupByEmail(FrameworkConfig* configParm, const char* email, char** employeeId, bool verbose)
{
const int scope = LDAP_SCOPE_SUBTREE;
const char* rtnAttr = "uid";
char filter[FILTER_BUFFER_SIZE];
LDAP* ldap = NULL;
LDAPMessage* result = NULL;
int status = 0;
if(!email)
{
status = -1;
}
if(status == 0)
{
int len = snprintf(filter, FILTER_BUFFER_SIZE, "(mail=%s)", email);
if(len == -1 || len > FILTER_BUFFER_SIZE)
{
status = -1;
}
}
if(status == 0)
{
if(verbose) fprintf(messageFile, "Ldap will connect to %s\n", configParm->ldapUrl);
ldap = NULL;
int rc = ldap_initialize(&ldap, configParm->ldapUrl);
if(rc != 0)
{
if(verbose) fprintf(messageFile, "ERROR: ldap_init failed\n");
status = -1;
}
}
if(status == 0)
{
int version = LDAP_VERSION3;
if(verbose) fprintf(messageFile, "Setting ldap to version 3\n");
int rc = ldap_set_option(ldap, LDAP_OPT_PROTOCOL_VERSION, &version);
if(rc != LDAP_OPT_SUCCESS)
{
if(verbose) fprintf(messageFile, "ERROR: unable to set ldap to version 3\n");
status = -1;
}
}
if(status == 0)
{
// Anonomous authentication
const char* who = NULL;
const char* cred = NULL;
if(verbose) fprintf(messageFile, "Attempting to bind:\n\twho: %s\n\tcredentials: %s\n", who, cred);
int rc = ldap_sasl_bind_s(ldap, NULL, NULL, NULL, NULL, NULL, NULL);
if(rc == -1)
{
if(verbose) fprintf(messageFile, "ERROR: unable to bind\n");
status = -1;
}
}
if(status == 0)
{
char** attrs = NULL;
int attrsonly = 0;
LDAPControl** serverctrls = NULL;
LDAPControl** clientctrls = NULL;
struct timeval* timeout = NULL;
int sizelimit = 0;
int rc = ldap_search_ext_s(ldap, configParm->ldapBase, scope, filter,
attrs, attrsonly, serverctrls, clientctrls, timeout, sizelimit, &result);
if(verbose)
{
fprintf(messageFile, "Attempting Ldap Search:\n"
"\tBase: \t\t %s\n"
"\tScope: \t\t %d\n"
"\tFilter: \t %s\n", configParm->ldapBase, scope, filter);
}
if(rc != 0)
{
if(verbose) fprintf(messageFile, "ERROR: ldap search failed %s\n", ldap_err2string(rc));
status = -1;
}
}
if(status == 0)
{
status = ldap_count_entries( ldap, result);
}
if(employeeId)
{
if(status > 0)
{
struct berval** values = ldap_get_values_len(ldap, result, rtnAttr);
if(values && values[0])
{
*employeeId = strndup(values[0]->bv_val, values[0]->bv_len);
}
else
{
if(verbose) fprintf(messageFile, "ERROR: unable to get serial number\n");
status = -1;
}
ldap_value_free_len(values);
}
}
if(result)
{
ldap_msgfree(result);
}
if(ldap)
{
ldap_unbind_ext_s(ldap, NULL, NULL);
}
return status;
}
// Testing code
//int main()
//{
// {
// char* id = NULL;
// int nEntries = ldapLookupByEmail("mtvaught@us.ibm.com", &id, true);
// printf("Good:\n\t%d entries found.\n\tID: %s\n", nEntries, id);
// free(id);
// }
// {
// int nEntries = ldapLookupByEmail("mtvaught@us.ibm.com", NULL, true);
// printf("Good:\n\t%d entries found.\n", nEntries);
// }
// {
// char* id = NULL;
// int nEntries = ldapLookupByEmail("invalidemail", &id, true);
// printf("Bad:\n\t%d entries found.\n\tID: %s\n", nEntries, id);
// }
// return 0;
//}
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