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/*
*----------------------------------------------------------------------------
*
* krb5wrap.cpp
*
* (C) 2004-2006 Dan Perry (dperry@pppl.gov)
* (C) 2006 Brian Elliott Finley (finley@anl.gov)
* (C) 2009-2010 Doug Engert (deengert@anl.gov)
* (C) 2010 James Y Knight (foom@fuhm.net)
* (C) 2010-2013 Ken Dreyer <ktdreyer at ktdreyer.com>
* (C) 2012-2017 Mark Proehl <mark at mproehl.net>
* (C) 2012-2017 Olaf Flebbe <of at oflebbe.de>
* (C) 2013-2017 Daniel Kobras <d.kobras at science-computing.de>
*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*-----------------------------------------------------------------------------
*/
#include "msktutil.h"
void krb5_error_exit( const char *func, int err_code) {
v_error_exit("error_exit: krb func %s failed: (%s)", func, error_message(err_code));
}
void krb5_warn( const char *func, int err_code) {
fprintf( stderr, "Warning: krb func %s failed: (%s)", func, error_message(err_code));
}
#ifdef HEIMDAL
krb5_error_code krb5_free_keytab_entry_contents(krb5_context context,
krb5_keytab_entry *entry)
{
if (entry) {
krb5_free_principal(context, entry->principal);
if (entry->keyblock.keyvalue.data) {
memset(entry->keyblock.keyvalue.data,
0,
entry->keyblock.keyvalue.length);
free(entry->keyblock.keyvalue.data);
}
return 0;
}
return -1;
}
#endif
void
initialize_g_context() {
VERBOSE("Creating Kerberos Context");
krb5_error_code ret = krb5_init_context(&g_context);
if (ret) {
krb5_error_exit("krb5_init_context", ret);
}
}
void
destroy_g_context() {
VERBOSE("Destroying Kerberos Context");
krb5_free_context(g_context);
g_context = 0;
}
void KRB5CCache::initialize(KRB5Principal &principal)
{
krb5_error_code ret = krb5_cc_initialize(g_context,
m_ccache,
principal.get());
if (ret) {
throw KRB5Exception("krb5_cc_initialize", ret);
}
}
void KRB5CCache::store(KRB5Creds &creds)
{
krb5_error_code ret = krb5_cc_store_cred(g_context,
m_ccache,
creds.get());
if (ret) {
throw KRB5Exception("krb5_cc_store_cred", ret);
}
}
KRB5Creds::KRB5Creds(KRB5Principal &principal,
KRB5Keytab &keytab,
const char *tkt_service) : m_creds()
{
krb5_error_code ret =
krb5_get_init_creds_keytab(g_context,
&m_creds,
principal.get(),
keytab.get(),
0,
const_cast<char*>(tkt_service), NULL);
if (ret) {
throw KRB5Exception("krb5_get_init_creds_keytab", ret);
}
}
KRB5Creds::KRB5Creds(KRB5Principal &principal,
const std::string &password,
const char *tkt_service) : m_creds()
{
krb5_error_code ret =
krb5_get_init_creds_password(g_context,
&m_creds,
principal.get(),
const_cast<char*>(password.c_str()),
NULL,
NULL,
0,
const_cast<char*>(tkt_service),
NULL);
if (ret) {
throw KRB5Exception("krb5_get_init_creds_keytab", ret);
}
}
std::string KRB5Principal::name()
{
char *principal_string;
krb5_error_code ret = krb5_unparse_name(g_context,
m_princ,
&principal_string);
if (ret) {
throw KRB5Exception("krb5_unparse_name", ret);
}
std::string result(principal_string);
#ifdef HEIMDAL
krb5_xfree(principal_string);
#else
krb5_free_unparsed_name(g_context, principal_string);
#endif
return result;
}
void KRB5Keytab::addEntry(const KRB5Principal &princ,
krb5_kvno kvno,
krb5_keyblock &keyblock)
{
krb5_keytab_entry entry;
entry.principal = princ.get();
entry.vno = kvno;
#ifdef HEIMDAL
entry.keyblock = keyblock;
#else
entry.key = keyblock;
#endif
// avoid duplicate entries
(void) krb5_kt_remove_entry(g_context,
m_keytab,
&entry);
krb5_error_code ret = krb5_kt_add_entry(g_context,
m_keytab,
&entry);
if (ret) {
if (errno != 0) {
fprintf(stderr,"Error: Keytab write error: %s!\n", strerror(errno));
}
throw KRB5Exception("krb5_kt_add_entry failed", ret);
}
}
void KRB5Keytab::addEntry(const KRB5Principal &princ,
krb5_kvno kvno,
krb5_enctype enctype,
const std::string &password,
const std::string &salt)
{
krb5_keyblock keyblock;
#ifdef HEIMDAL
krb5_data pass_data;
krb5_salt salt_data;
salt_data.salttype = KRB5_PW_SALT;
salt_data.saltvalue.data = const_cast<char *>(salt.c_str());
salt_data.saltvalue.length = salt.length();
pass_data.data = const_cast<char *>(password.c_str());
pass_data.length = password.length();
krb5_error_code ret = krb5_string_to_key_data_salt(g_context,
enctype,
pass_data,
salt_data,
&keyblock);
if (ret) {
throw KRB5Exception("krb5_string_to_key_data_salt", ret);
}
#else
krb5_data salt_data, pass_data;
salt_data.data = const_cast<char *>(salt.c_str());
salt_data.length = salt.length();
pass_data.data = const_cast<char *>(password.c_str());
pass_data.length = password.length();
krb5_error_code ret = krb5_c_string_to_key(g_context,
enctype,
&pass_data,
&salt_data,
&keyblock);
if (ret) {
throw KRB5Exception("krb5_c_string_to_key", ret);
}
#endif
addEntry(princ, kvno, keyblock);
}
void KRB5Keytab::removeEntry(const KRB5Principal &princ,
krb5_kvno kvno,
krb5_enctype enctype)
{
krb5_keytab_entry entry;
entry.principal = princ.get();
entry.vno = kvno;
#ifdef HEIMDAL
entry.keyblock.keytype = enctype;
#else
entry.key.enctype = enctype;
#endif
krb5_error_code ret = krb5_kt_remove_entry(g_context,
m_keytab,
&entry);
if (ret) {
if (errno != 0) {
fprintf(stderr,"Error: Keytab write error: %s!\n", strerror(errno));
}
throw KRB5Exception("krb5_kt_remove_entry", ret);
}
}
KRB5Keytab::cursor::cursor(KRB5Keytab &keytab) : m_keytab(keytab),
m_cursor(),
m_entry(),
m_princ(),
m_ok(true)
{
memset(&m_entry, 0, sizeof(m_entry));
krb5_error_code ret = krb5_kt_start_seq_get(g_context,
m_keytab.m_keytab,
&m_cursor);
if (ret) {
m_ok = false;
}
}
KRB5Keytab::cursor::~cursor()
{
if (!m_ok) {
m_princ.reset_no_free(NULL);
return;
}
krb5_free_keytab_entry_contents(g_context, &m_entry);
memset(&m_entry, 0, sizeof(m_entry));
/* Tell m_princ to not free its contents! */
m_princ.reset_no_free(NULL);
krb5_error_code ret = krb5_kt_end_seq_get(g_context,
m_keytab.m_keytab,
&m_cursor);
if (ret) {
krb5_warn("krb5_kt_end_seq_get", ret);
}
}
void KRB5Keytab::cursor::reset()
{
if (!m_ok) {
return;
}
krb5_error_code ret = krb5_kt_start_seq_get(g_context,
m_keytab.m_keytab,
&m_cursor);
if (ret) {
m_ok = false;
}
}
bool KRB5Keytab::cursor::next()
{
if (!m_ok) {
return false;
}
krb5_free_keytab_entry_contents(g_context, &m_entry);
memset(&m_entry, 0, sizeof(m_entry));
krb5_error_code ret = krb5_kt_next_entry(g_context,
m_keytab.m_keytab,
&m_entry,
&m_cursor);
m_princ.reset_no_free(m_entry.principal);
return ret == 0;
}
krb5_context g_context = NULL;
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