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/** BEGIN COPYRIGHT BLOCK
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "certmap.h" /* Public Certmap API */
#include "plugin.h" /* must define extern "C" functions */
#ifdef WIN32
CertmapDLLInitFnTbl /* Initialize Certmap Function Table */
#endif
CertSearchFn_t default_searchfn = 0;
/* plugin_ereport -
This function prints an error message to stderr. It prints the issuerDN
and subjectDN alongwith the given message.
*/
static void plugin_ereport (const char *msg, void *cert)
{
int rv;
char *subjectDN;
char *issuerDN;
char *default_subjectDN = "Failed to get the subject DN";
char *default_issuerDN = "Failed to get the issuer DN";
rv = ldapu_get_cert_subject_dn(cert, &subjectDN);
if (rv != LDAPU_SUCCESS || !subjectDN) {
subjectDN = default_subjectDN;
}
rv = ldapu_get_cert_issuer_dn(cert, &issuerDN);
if (rv != LDAPU_SUCCESS || !issuerDN) {
issuerDN = default_issuerDN;
}
fprintf(stderr, "%s. Issuer: %s, Subject: %s\n", msg, issuerDN,
subjectDN);
if (default_subjectDN != subjectDN) ldapu_free(subjectDN);
if (default_issuerDN != issuerDN) ldapu_free(issuerDN);
}
/* plugin_mapping_fn -
This mapping function extracts "CN", "O" and "C" attributes from the
subject DN to form ldapDN. It inserts "ou=<defaultOU>" between the
"CN" and the "O" attr-value pair. The <defaultOU> can be configured in
the certmap.conf config file.
If the "C" attr is absent, it defaults to "US".
It extracts the "E" attribute to form the filter.
*/
int plugin_mapping_fn (void *cert, LDAP *ld, void *certmap_info,
char **ldapDN, char **filter)
{
char **cn_val; /* get this from the cert */
char **o_val; /* get this from the cert */
char **c_val; /* get this from the cert */
char **e_val; /* get this from the cert */
char *ou_val; /* get this from the config file */
int len;
int rv;
fprintf(stderr, "plugin_mapping_fn called.\n");
rv = ldapu_get_cert_ava_val(cert, LDAPU_SUBJECT_DN, "CN", &cn_val);
if (rv != LDAPU_SUCCESS || !cn_val) {
plugin_ereport("plugin_mapping_fn: Failed to extract \"CN\" from the cert", cert);
return LDAPU_CERT_MAP_FUNCTION_FAILED;
}
rv = ldapu_get_cert_ava_val(cert, LDAPU_SUBJECT_DN, "O", &o_val);
if (rv != LDAPU_SUCCESS || !o_val) {
plugin_ereport("plugin_mapping_fn: Failed to extract \"O\" from the cert", cert);
return LDAPU_CERT_MAP_FUNCTION_FAILED;
}
rv = ldapu_get_cert_ava_val(cert, LDAPU_SUBJECT_DN, "C", &c_val);
if (rv != LDAPU_SUCCESS || !c_val) {
plugin_ereport("plugin_mapping_fn: Failed to extract \"C\" from the cert", cert);
}
rv = ldapu_get_cert_ava_val(cert, LDAPU_SUBJECT_DN, "E", &e_val);
if (rv != LDAPU_SUCCESS || !e_val) {
/* Don't return error -- just print the warning */
plugin_ereport("plugin_mapping_fn: Failed to extract \"E\" from the cert", cert);
}
/* Get the "OU" from the "defaultOU" property from the config file */
rv = ldapu_certmap_info_attrval(certmap_info, "defaultOU", &ou_val);
if (rv != LDAPU_SUCCESS || !ou_val) {
plugin_ereport("plugin_mapping_fn: Failed to get \"defaultOU\" from the configuration", cert);
return LDAPU_CERT_MAP_FUNCTION_FAILED;
}
len = strlen("cn=, ou=, o=, c=") + strlen(cn_val[0]) + strlen(ou_val) +
strlen(o_val[0]) + (c_val ? strlen(c_val[0]) : strlen("US")) + 1;
*ldapDN = (char *)ldapu_malloc(len);
if (!*ldapDN) {
plugin_ereport("plugin_mapping_fn: Ran out of memory", cert);
return LDAPU_CERT_MAP_FUNCTION_FAILED;
}
if (e_val) {
len = strlen("mail=") + strlen(e_val[0]) + 1;
*filter = (char *)ldapu_malloc(len);
if (!*filter) {
free(*ldapDN);
plugin_ereport("plugin_mapping_fn: Ran out of memory", cert);
return LDAPU_CERT_MAP_FUNCTION_FAILED;
}
sprintf(*filter, "mail=%s", e_val[0]);
}
else {
*filter = 0;
}
sprintf(*ldapDN, "cn=%s, ou=%s, o=%s, c=%s", cn_val[0], ou_val,
o_val[0], c_val ? c_val[0] : "US");
ldapu_free_cert_ava_val(cn_val);
ldapu_free_cert_ava_val(o_val);
ldapu_free_cert_ava_val(c_val);
ldapu_free_cert_ava_val(e_val);
ldapu_free(ou_val);
fprintf(stderr, "plugin_mapping_fn Returned:\n\tldapDN: \"%s\"\n\tfilter: \"%s\"\n",
*ldapDN, *filter ? *filter : "<NULL>");
return LDAPU_SUCCESS;
}
int plugin_cert_serial_number (void *cert)
{
/* Just a stub function. You can get the DER encoded cert by using the
function ldapu_get_cert_der:
*/
unsigned char *derCert;
unsigned int len;
int rv;
int sno;
rv = ldapu_get_cert_der(cert, &derCert, &len);
/* extract the serial number from derCert */
sno = 43534754; /* a fake value for now */
ldapu_free((char *)derCert);
return sno;
}
/* plugin_search_fn -
This function first does a search based on the cert's serial number.
If that fails, it calls the default search function.
*/
int plugin_search_fn (void *cert, LDAP *ld, void *certmap_info,
const char *suffix,
const char *ldapdn, const char *filter,
const char **attrs, LDAPMessage **res)
{
int rv;
char snoFilter[256];
fprintf(stderr, "plugin_search_fn called.\n");
sprintf(snoFilter, "certSerialNumber=%d",
plugin_cert_serial_number(cert));
/* Search the entire LDAP tree for "certSerialNumber=<serial No.>" */
rv = ldap_search_s(ld, suffix, LDAP_SCOPE_SUBTREE, snoFilter,
(char **)attrs, 0, res);
/* ldap_search_s returns LDAP_SUCCESS (rather than LDAPU_SUCCESS)
if there is no error but there may not be any matching entries.
*/
if (rv == LDAP_SUCCESS) {
/* There was no error but check if any entries matched */
int numEntries = ldap_count_entries(ld, *res);
if (numEntries > 0) {
/* at least one entry matched */
/* change the return value to LDAPU_SUCCESS from LDAP_SUCCESS */
rv = LDAPU_SUCCESS;
}
else {
/* Try the default search function */
rv = (*default_searchfn)(cert, ld, certmap_info, suffix, ldapdn,
filter, attrs, res);
}
}
/* It's ok to return the error code from ldap_search_s */
return rv;
}
/*
plugin_verify_fn -
This function returns success if only one entry exists in 'res'.
*/
int plugin_verify_fn (void *cert, LDAP *ld, void *certmap_info,
LDAPMessage *res, LDAPMessage **entry)
{
int rv;
int numEntries;
fprintf(stderr, "plugin_verify_fn called.\n");
numEntries = ldap_count_entries(ld, res);
if (numEntries == 1) {
*entry = ldap_first_entry(ld, res);
rv = LDAPU_SUCCESS;
}
else {
plugin_ereport("plugin_verify_fn: Failing because multiple entries matched.",
cert);
*entry = 0;
rv = LDAPU_CERT_VERIFY_FUNCTION_FAILED;
}
return rv;
}
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