/*
Unix SMB/CIFS implementation.
simple kerberos5 routines for active directory
Copyright (C) Andrew Tridgell 2001
Copyright (C) Luke Howard 2002-2003
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
Copyright (C) Guenther Deschner 2005
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define KRB5_PRIVATE 1 /* this file uses PRIVATE interfaces! */
#define KRB5_DEPRECATED 1 /* this file uses DEPRECATED interfaces! */
#include "includes.h"
#ifdef HAVE_KRB5
#ifdef HAVE_KRB5_KEYBLOCK_KEYVALUE
#define KRB5_KEY_TYPE(k) ((k)->keytype)
#define KRB5_KEY_LENGTH(k) ((k)->keyvalue.length)
#define KRB5_KEY_DATA(k) ((k)->keyvalue.data)
#else
#define KRB5_KEY_TYPE(k) ((k)->enctype)
#define KRB5_KEY_LENGTH(k) ((k)->length)
#define KRB5_KEY_DATA(k) ((k)->contents)
#endif /* HAVE_KRB5_KEYBLOCK_KEYVALUE */
/**************************************************************
Wrappers around kerberos string functions that convert from
utf8 -> unix charset and vica versa.
**************************************************************/
/**************************************************************
krb5_parse_name that takes a UNIX charset.
**************************************************************/
krb5_error_code smb_krb5_parse_name(krb5_context context,
const char *name, /* in unix charset */
krb5_principal *principal)
{
krb5_error_code ret;
char *utf8_name;
if (push_utf8_allocate(&utf8_name, name) == (size_t)-1) {
return ENOMEM;
}
ret = krb5_parse_name(context, utf8_name, principal);
SAFE_FREE(utf8_name);
return ret;
}
#ifdef HAVE_KRB5_PARSE_NAME_NOREALM
/**************************************************************
krb5_parse_name_norealm that takes a UNIX charset.
**************************************************************/
static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
const char *name, /* in unix charset */
krb5_principal *principal)
{
krb5_error_code ret;
char *utf8_name;
*principal = NULL;
if (push_utf8_allocate(&utf8_name, name) == (size_t)-1) {
return ENOMEM;
}
ret = krb5_parse_name_norealm(context, utf8_name, principal);
SAFE_FREE(utf8_name);
return ret;
}
#endif
/**************************************************************
krb5_parse_name that returns a UNIX charset name. Must
be freed with normal free() call.
**************************************************************/
krb5_error_code smb_krb5_unparse_name(krb5_context context,
krb5_const_principal principal,
char **unix_name)
{
krb5_error_code ret;
char *utf8_name;
*unix_name = NULL;
ret = krb5_unparse_name(context, principal, &utf8_name);
if (ret) {
return ret;
}
if (pull_utf8_allocate(unix_name, utf8_name)==-1) {
krb5_free_unparsed_name(context, utf8_name);
return ENOMEM;
}
krb5_free_unparsed_name(context, utf8_name);
return 0;
}
#ifndef HAVE_KRB5_SET_REAL_TIME
/*
* This function is not in the Heimdal mainline.
*/
krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
{
krb5_error_code ret;
int32_t sec, usec;
ret = krb5_us_timeofday(context, &sec, &usec);
if (ret)
return ret;
context->kdc_sec_offset = seconds - sec;
context->kdc_usec_offset = microseconds - usec;
return 0;
}
#endif
#if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
#if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
/* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
* to krb5_set_default_tgs_ktypes. See
* http://lists.samba.org/archive/samba-technical/2006-July/048271.html
*
* If the MIT libraries are not exporting internal symbols, we will end up in
* this branch, which is correct. Otherwise we will continue to use the
* internal symbol
*/
krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
{
return krb5_set_default_tgs_enctypes(ctx, enc);
}
#elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
/* Heimdal */
krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
{
return krb5_set_default_in_tkt_etypes(ctx, enc);
}
#endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
#endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
/* HEIMDAL */
void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr)
{
pkaddr->addr_type = KRB5_ADDRESS_INET;
pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
}
#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
/* MIT */
void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr)
{
pkaddr->addrtype = ADDRTYPE_INET;
pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
}
#else
#error UNKNOWN_ADDRTYPE
#endif
#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
int create_kerberos_key_from_string_direct(krb5_context context,
krb5_principal host_princ,
krb5_data *password,
krb5_keyblock *key,
krb5_enctype enctype)
{
int ret;
krb5_data salt;
krb5_encrypt_block eblock;
ret = krb5_principal2salt(context, host_princ, &salt);
if (ret) {
DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
return ret;
}
krb5_use_enctype(context, &eblock, enctype);
ret = krb5_string_to_key(context, &eblock, key, password, &salt);
SAFE_FREE(salt.data);
return ret;
}
#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
int create_kerberos_key_from_string_direct(krb5_context context,
krb5_principal host_princ,
krb5_data *password,
krb5_keyblock *key,
krb5_enctype enctype)
{
int ret;
krb5_salt salt;
ret = krb5_get_pw_salt(context, host_princ, &salt);
if (ret) {
DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
return ret;
}
ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
krb5_free_salt(context, salt);
return ret;
}
#else
#error UNKNOWN_CREATE_KEY_FUNCTIONS
#endif
int create_kerberos_key_from_string(krb5_context context,
krb5_principal host_princ,
krb5_data *password,
krb5_keyblock *key,
krb5_enctype enctype)
{
krb5_principal salt_princ = NULL;
int ret;
/*
* Check if we've determined that the KDC is salting keys for this
* principal/enctype in a non-obvious way. If it is, try to match
* its behavior.
*/
salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
if (salt_princ) {
krb5_free_principal(context, salt_princ);
}
return ret;
}
#if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
krb5_enctype **enctypes)
{
return krb5_get_permitted_enctypes(context, enctypes);
}
#elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
krb5_enctype **enctypes)
{
return krb5_get_default_in_tkt_etypes(context, enctypes);
}
#else
#error UNKNOWN_GET_ENCTYPES_FUNCTIONS
#endif
#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
krb5_auth_context auth_context,
krb5_keyblock *keyblock)
{
return krb5_auth_con_setkey(context, auth_context, keyblock);
}
#endif
BOOL unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
{
DATA_BLOB pac_contents;
ASN1_DATA data;
int data_type;
if (!auth_data->length) {
return False;
}
asn1_load(&data, *auth_data);
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_CONTEXT(0));
asn1_read_Integer(&data, &data_type);
if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
asn1_free(&data);
return False;
}
asn1_end_tag(&data);
asn1_start_tag(&data, ASN1_CONTEXT(1));
asn1_read_OctetString(&data, &pac_contents);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_free(&data);
*unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
data_blob_free(&pac_contents);
return True;
}
BOOL get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
{
DATA_BLOB auth_data_wrapped;
BOOL got_auth_data_pac = False;
int i;
#if defined(HAVE_KRB5_TKT_ENC_PART2)
if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
tkt->enc_part2->authorization_data[0] &&
tkt->enc_part2->authorization_data[0]->length)
{
for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
if (tkt->enc_part2->authorization_data[i]->ad_type !=
KRB5_AUTHDATA_IF_RELEVANT) {
DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
tkt->enc_part2->authorization_data[i]->ad_type));
continue;
}
auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
tkt->enc_part2->authorization_data[i]->length);
/* check if it is a PAC */
got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
data_blob_free(&auth_data_wrapped);
if (!got_auth_data_pac) {
continue;
}
}
return got_auth_data_pac;
}
#else
if (tkt->ticket.authorization_data &&
tkt->ticket.authorization_data->len)
{
for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
if (tkt->ticket.authorization_data->val[i].ad_type !=
KRB5_AUTHDATA_IF_RELEVANT) {
DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
tkt->ticket.authorization_data->val[i].ad_type));
continue;
}
auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
tkt->ticket.authorization_data->val[i].ad_data.length);
/* check if it is a PAC */
got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
data_blob_free(&auth_data_wrapped);
if (!got_auth_data_pac) {
continue;
}
}
return got_auth_data_pac;
}
#endif
return False;
}
krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
{
#if defined(HAVE_KRB5_TKT_ENC_PART2)
return tkt->enc_part2->client;
#else
return tkt->client;
#endif
}
#if !defined(HAVE_KRB5_LOCATE_KDC)
/* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
* to a public interface for this functionality, so we have to be able to live
* without it if the MIT libraries are hiding their internal symbols.
*/
#if defined(KRB5_KRBHST_INIT)
/* Heimdal */
krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
{
krb5_krbhst_handle hnd;
krb5_krbhst_info *hinfo;
krb5_error_code rc;
int num_kdcs, i;
struct sockaddr *sa;
struct addrinfo *ai;
*addr_pp = NULL;
*naddrs = 0;
rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
if (rc) {
DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
return rc;
}
for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
;
krb5_krbhst_reset(ctx, hnd);
if (!num_kdcs) {
DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
krb5_krbhst_free(ctx, hnd);
return -1;
}
sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
if (!sa) {
DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
krb5_krbhst_free(ctx, hnd);
naddrs = 0;
return -1;
}
memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
#if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
if (rc) {
DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
continue;
}
#endif
if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
}
krb5_krbhst_free(ctx, hnd);
*naddrs = num_kdcs;
*addr_pp = sa;
return 0;
}
#else /* ! defined(KRB5_KRBHST_INIT) */
krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
struct sockaddr **addr_pp, int *naddrs, int get_masters)
{
DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
return KRB5_KDC_UNREACH;
}
#endif /* KRB5_KRBHST_INIT */
#else /* ! HAVE_KRB5_LOCATE_KDC */
krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
struct sockaddr **addr_pp, int *naddrs, int get_masters)
{
return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
}
#endif /* HAVE_KRB5_LOCATE_KDC */
#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
void krb5_free_unparsed_name(krb5_context context, char *val)
{
SAFE_FREE(val);
}
#endif
void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
{
#if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
if (pdata->data) {
krb5_free_data_contents(context, pdata);
}
#else
SAFE_FREE(pdata->data);
#endif
}
void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
{
#if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
#elif defined(HAVE_KRB5_SESSION_IN_CREDS)
KRB5_KEY_TYPE((&pcreds->session)) = enctype;
#else
#error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
#endif
}
BOOL kerberos_compatible_enctypes(krb5_context context,
krb5_enctype enctype1,
krb5_enctype enctype2)
{
#if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
krb5_boolean similar = 0;
krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
return similar ? True : False;
#elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
#endif
}
static BOOL ads_cleanup_expired_creds(krb5_context context,
krb5_ccache ccache,
krb5_creds *credsp)
{
krb5_error_code retval;
const char *cc_type = krb5_cc_get_type(context, ccache);
DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
cc_type, krb5_cc_get_name(context, ccache),
http_timestring(credsp->times.endtime)));
/* we will probably need new tickets if the current ones
will expire within 10 seconds.
*/
if (credsp->times.endtime >= (time(NULL) + 10))
return False;
/* heimdal won't remove creds from a file ccache, and
perhaps we shouldn't anyway, since internally we
use memory ccaches, and a FILE one probably means that
we're using creds obtained outside of our exectuable
*/
if (strequal(cc_type, "FILE")) {
DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
return False;
}
retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
if (retval) {
DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
error_message(retval)));
/* If we have an error in this, we want to display it,
but continue as though we deleted it */
}
return True;
}
/*
we can't use krb5_mk_req because w2k wants the service to be in a particular format
*/
static krb5_error_code ads_krb5_mk_req(krb5_context context,
krb5_auth_context *auth_context,
const krb5_flags ap_req_options,
const char *principal,
krb5_ccache ccache,
krb5_data *outbuf,
time_t *expire_time)
{
krb5_error_code retval;
krb5_principal server;
krb5_creds * credsp;
krb5_creds creds;
krb5_data in_data;
BOOL creds_ready = False;
int i = 0, maxtries = 3;
retval = smb_krb5_parse_name(context, principal, &server);
if (retval) {
DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
return retval;
}
/* obtain ticket & session key */
ZERO_STRUCT(creds);
if ((retval = krb5_copy_principal(context, server, &creds.server))) {
DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
error_message(retval)));
goto cleanup_princ;
}
if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
/* This can commonly fail on smbd startup with no ticket in the cache.
* Report at higher level than 1. */
DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
error_message(retval)));
goto cleanup_creds;
}
while (!creds_ready && (i < maxtries)) {
if ((retval = krb5_get_credentials(context, 0, ccache,
&creds, &credsp))) {
DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
principal, error_message(retval)));
goto cleanup_creds;
}
/* cope with ticket being in the future due to clock skew */
if ((unsigned)credsp->times.starttime > time(NULL)) {
time_t t = time(NULL);
int time_offset =(int)((unsigned)credsp->times.starttime-t);
DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
krb5_set_real_time(context, t + time_offset + 1, 0);
}
if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
creds_ready = True;
}
i++;
}
DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
http_timestring((unsigned)credsp->times.endtime),
(unsigned)credsp->times.endtime));
if (expire_time) {
*expire_time = (time_t)credsp->times.endtime;
}
in_data.length = 0;
retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
&in_data, credsp, outbuf);
if (retval) {
DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
error_message(retval)));
}
krb5_free_creds(context, credsp);
cleanup_creds:
krb5_free_cred_contents(context, &creds);
cleanup_princ:
krb5_free_principal(context, server);
return retval;
}
/*
get a kerberos5 ticket for the given service
*/
int cli_krb5_get_ticket(const char *principal, time_t time_offset,
DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
uint32 extra_ap_opts, const char *ccname,
time_t *tgs_expire)
{
krb5_error_code retval;
krb5_data packet;
krb5_context context = NULL;
krb5_ccache ccdef = NULL;
krb5_auth_context auth_context = NULL;
krb5_enctype enc_types[] = {
#ifdef ENCTYPE_ARCFOUR_HMAC
ENCTYPE_ARCFOUR_HMAC,
#endif
ENCTYPE_DES_CBC_MD5,
ENCTYPE_DES_CBC_CRC,
ENCTYPE_NULL};
initialize_krb5_error_table();
retval = krb5_init_context(&context);
if (retval) {
DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
error_message(retval)));
goto failed;
}
if (time_offset != 0) {
krb5_set_real_time(context, time(NULL) + time_offset, 0);
}
if ((retval = krb5_cc_resolve(context, ccname ?
ccname : krb5_cc_default_name(context), &ccdef))) {
DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
error_message(retval)));
goto failed;
}
if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
error_message(retval)));
goto failed;
}
if ((retval = ads_krb5_mk_req(context,
&auth_context,
AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
principal,
ccdef, &packet,
tgs_expire))) {
goto failed;
}
get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
*ticket = data_blob(packet.data, packet.length);
kerberos_free_data_contents(context, &packet);
failed:
if ( context ) {
if (ccdef)
krb5_cc_close(context, ccdef);
if (auth_context)
krb5_auth_con_free(context, auth_context);
krb5_free_context(context);
}
return retval;
}
BOOL get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, BOOL remote)
{
krb5_keyblock *skey;
krb5_error_code err;
BOOL ret = False;
if (remote)
err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
else
err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
if (err == 0 && skey != NULL) {
DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey)));
*session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
ret = True;
krb5_free_keyblock(context, skey);
} else {
DEBUG(10, ("KRB5 error getting session key %d\n", err));
}
return ret;
}
#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
{
static krb5_data kdata;
kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
kdata.length = strlen((const char *)kdata.data);
return &kdata;
}
#endif
krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
{
#if defined(HAVE_KRB5_KT_FREE_ENTRY)
return krb5_kt_free_entry(context, kt_entry);
#elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
return krb5_free_keytab_entry_contents(context, kt_entry);
#else
#error UNKNOWN_KT_FREE_FUNCTION
#endif
}
void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
PAC_SIGNATURE_DATA *sig)
{
#ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
cksum->cksumtype = (krb5_cksumtype)sig->type;
cksum->checksum.length = sig->signature.buf_len;
cksum->checksum.data = sig->signature.buffer;
#else
cksum->checksum_type = (krb5_cksumtype)sig->type;
cksum->length = sig->signature.buf_len;
cksum->contents = sig->signature.buffer;
#endif
}
krb5_error_code smb_krb5_verify_checksum(krb5_context context,
krb5_keyblock *keyblock,
krb5_keyusage usage,
krb5_checksum *cksum,
uint8 *data,
size_t length)
{
krb5_error_code ret;
/* verify the checksum */
/* welcome to the wonderful world of samba's kerberos abstraction layer:
*
* function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
* -----------------------------------------------------------------------------
* krb5_c_verify_checksum - works works
* krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
*/
#if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
{
krb5_boolean checksum_valid = False;
krb5_data input;
input.data = (char *)data;
input.length = length;
ret = krb5_c_verify_checksum(context,
keyblock,
usage,
&input,
cksum,
&checksum_valid);
if (ret) {
DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
error_message(ret)));
return ret;
}
if (!checksum_valid)
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
}
#elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
/* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
* without enctype and it ignores any key_usage types - Guenther */
{
krb5_crypto crypto;
ret = krb5_crypto_init(context,
keyblock,
0,
&crypto);
if (ret) {
DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
error_message(ret)));
return ret;
}
ret = krb5_verify_checksum(context,
crypto,
usage,
data,
length,
cksum);
krb5_crypto_destroy(context, crypto);
}
#else
#error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
#endif
return ret;
}
time_t get_authtime_from_tkt(krb5_ticket *tkt)
{
#if defined(HAVE_KRB5_TKT_ENC_PART2)
return tkt->enc_part2->times.authtime;
#else
return tkt->ticket.authtime;
#endif
}
#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
{
#ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
if (ap_req->ticket->enc_part.kvno)
return ap_req->ticket->enc_part.kvno;
#else /* Heimdal */
if (ap_req->ticket.enc_part.kvno)
return *ap_req->ticket.enc_part.kvno;
#endif
return 0;
}
static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
{
#ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
return ap_req->ticket.enc_part.etype;
#else /* MIT */
return ap_req->ticket->enc_part.enctype;
#endif
}
#endif /* HAVE_KRB5_DECODE_AP_REQ */
static krb5_error_code
get_key_from_keytab(krb5_context context,
krb5_const_principal server,
krb5_enctype enctype,
krb5_kvno kvno,
krb5_keyblock **out_key)
{
krb5_keytab_entry entry;
krb5_error_code ret;
krb5_keytab keytab;
char *name = NULL;
/* We have to open a new keytab handle here, as MIT does
an implicit open/getnext/close on krb5_kt_get_entry. We
may be in the middle of a keytab enumeration when this is
called. JRA. */
ret = krb5_kt_default(context, &keytab);
if (ret) {
DEBUG(0,("get_key_from_keytab: failed to open keytab: %s\n", error_message(ret)));
return ret;
}
if ( DEBUGLEVEL >= 10 ) {
if (smb_krb5_unparse_name(context, server, &name) == 0) {
DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
kvno, enctype, name));
SAFE_FREE(name);
}
}
ret = krb5_kt_get_entry(context,
keytab,
server,
kvno,
enctype,
&entry);
if (ret) {
DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
goto out;
}
#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK /* Heimdal */
ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
#elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) /* MIT */
ret = krb5_copy_keyblock(context, &entry.key, out_key);
#else
#error UNKNOWN_KRB5_KEYTAB_ENTRY_FORMAT
#endif
if (ret) {
DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
goto out;
}
smb_krb5_kt_free_entry(context, &entry);
out:
krb5_kt_close(context, keytab);
return ret;
}
/* Prototypes */
krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
const krb5_data *inbuf,
krb5_kvno *kvno,
krb5_enctype *enctype)
{
#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
{
krb5_error_code ret;
krb5_ap_req ap_req;
ret = krb5_decode_ap_req(context, inbuf, &ap_req);
if (ret)
return ret;
*kvno = get_kvno_from_ap_req(&ap_req);
*enctype = get_enctype_from_ap_req(&ap_req);
free_AP_REQ(&ap_req);
return 0;
}
#endif
/* Possibly not an appropriate error code. */
return KRB5KDC_ERR_BADOPTION;
}
krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
krb5_auth_context *auth_context,
const krb5_data *inbuf,
krb5_const_principal server,
krb5_keytab keytab,
krb5_flags *ap_req_options,
krb5_ticket **ticket,
krb5_keyblock **keyblock)
{
krb5_error_code ret;
krb5_kvno kvno;
krb5_enctype enctype;
krb5_keyblock *local_keyblock;
ret = krb5_rd_req(context,
auth_context,
inbuf,
server,
keytab,
ap_req_options,
ticket);
if (ret) {
return ret;
}
#ifdef KRB5_TICKET_HAS_KEYINFO
enctype = (*ticket)->enc_part.enctype;
kvno = (*ticket)->enc_part.kvno;
#else
ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
if (ret) {
return ret;
}
#endif
ret = get_key_from_keytab(context,
server,
enctype,
kvno,
&local_keyblock);
if (ret) {
DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
goto out;
}
out:
if (ret && local_keyblock != NULL) {
krb5_free_keyblock(context, local_keyblock);
} else {
*keyblock = local_keyblock;
}
return ret;
}
krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
const char *name,
krb5_principal *principal)
{
#ifdef HAVE_KRB5_PARSE_NAME_NOREALM
return smb_krb5_parse_name_norealm_conv(context, name, principal);
#endif
/* we are cheating here because parse_name will in fact set the realm.
* We don't care as the only caller of smb_krb5_parse_name_norealm
* ignores the realm anyway when calling
* smb_krb5_principal_compare_any_realm later - Guenther */
return smb_krb5_parse_name(context, name, principal);
}
BOOL smb_krb5_principal_compare_any_realm(krb5_context context,
krb5_const_principal princ1,
krb5_const_principal princ2)
{
#ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
return krb5_principal_compare_any_realm(context, princ1, princ2);
/* krb5_princ_size is a macro in MIT */
#elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
int i, len1, len2;
const krb5_data *p1, *p2;
len1 = krb5_princ_size(context, princ1);
len2 = krb5_princ_size(context, princ2);
if (len1 != len2)
return False;
for (i = 0; i < len1; i++) {
p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
return False;
}
return True;
#else
#error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
#endif
}
krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
const char *client_string, /* gd@BER.SUSE.DE */
const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
time_t *expire_time)
{
krb5_error_code ret;
krb5_context context = NULL;
krb5_ccache ccache = NULL;
krb5_principal client = NULL;
initialize_krb5_error_table();
ret = krb5_init_context(&context);
if (ret) {
goto done;
}
if (!ccache_string) {
ccache_string = krb5_cc_default_name(context);
}
DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
/* FIXME: we should not fall back to defaults */
ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
if (ret) {
goto done;
}
#ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
{
krb5_creds creds;
if (client_string) {
ret = smb_krb5_parse_name(context, client_string, &client);
if (ret) {
goto done;
}
} else {
ret = krb5_cc_get_principal(context, ccache, &client);
if (ret) {
goto done;
}
}
ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
if (ret) {
DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
goto done;
}
/* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
ret = krb5_cc_initialize(context, ccache, client);
if (ret) {
goto done;
}
ret = krb5_cc_store_cred(context, ccache, &creds);
if (expire_time) {
*expire_time = (time_t) creds.times.endtime;
}
krb5_free_cred_contents(context, &creds);
}
#elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
{
krb5_kdc_flags flags;
krb5_creds creds_in;
krb5_realm *client_realm;
krb5_creds *creds;
memset(&creds_in, 0, sizeof(creds_in));
if (client_string) {
ret = smb_krb5_parse_name(context, client_string, &creds_in.client);
if (ret) {
goto done;
}
} else {
ret = krb5_cc_get_principal(context, ccache, &creds_in.client);
if (ret) {
goto done;
}
}
if (service_string) {
ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
if (ret) {
goto done;
}
} else {
/* build tgt service by default */
client_realm = krb5_princ_realm(context, creds_in.client);
if (!client_realm) {
ret = ENOMEM;
goto done;
}
ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
if (ret) {
goto done;
}
}
flags.i = 0;
flags.b.renewable = flags.b.renew = True;
ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds);
if (ret) {
DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
goto done;
}
/* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
ret = krb5_cc_initialize(context, ccache, creds_in.client);
if (ret) {
goto done;
}
ret = krb5_cc_store_cred(context, ccache, creds);
if (expire_time) {
*expire_time = (time_t) creds->times.endtime;
}
krb5_free_cred_contents(context, &creds_in);
krb5_free_creds(context, creds);
}
#else
#error No suitable krb5 ticket renew function available
#endif
done:
if (client) {
krb5_free_principal(context, client);
}
if (context) {
krb5_free_context(context);
}
if (ccache) {
krb5_cc_close(context, ccache);
}
return ret;
}
krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
{
krb5_error_code ret = 0;
if (addr == NULL) {
return ret;
}
#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
krb5_free_addresses(context, addr->addrs);
#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
ret = krb5_free_addresses(context, addr->addrs);
SAFE_FREE(addr->addrs);
#endif
SAFE_FREE(addr);
addr = NULL;
return ret;
}
krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
{
krb5_error_code ret = 0;
nstring buf;
#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
krb5_address **addrs = NULL;
#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
krb5_addresses *addrs = NULL;
#endif
*kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
if (*kerb_addr == NULL) {
return ENOMEM;
}
put_name(buf, global_myname(), ' ', 0x20);
#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
{
int num_addr = 2;
addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
if (addrs == NULL) {
SAFE_FREE(kerb_addr);
return ENOMEM;
}
memset(addrs, 0, sizeof(krb5_address *) * num_addr);
addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
if (addrs[0] == NULL) {
SAFE_FREE(addrs);
SAFE_FREE(kerb_addr);
return ENOMEM;
}
addrs[0]->magic = KV5M_ADDRESS;
addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
addrs[0]->length = MAX_NETBIOSNAME_LEN;
addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
if (addrs[0]->contents == NULL) {
SAFE_FREE(addrs[0]);
SAFE_FREE(addrs);
SAFE_FREE(kerb_addr);
return ENOMEM;
}
memcpy(addrs[0]->contents, buf, addrs[0]->length);
addrs[1] = NULL;
}
#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
{
addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
if (addrs == NULL) {
SAFE_FREE(kerb_addr);
return ENOMEM;
}
memset(addrs, 0, sizeof(krb5_addresses));
addrs->len = 1;
addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
if (addrs->val == NULL) {
SAFE_FREE(addrs);
SAFE_FREE(kerb_addr);
return ENOMEM;
}
addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
if (addrs->val[0].address.data == NULL) {
SAFE_FREE(addrs->val);
SAFE_FREE(addrs);
SAFE_FREE(kerb_addr);
return ENOMEM;
}
memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
}
#else
#error UNKNOWN_KRB5_ADDRESS_FORMAT
#endif
(*kerb_addr)->addrs = addrs;
return ret;
}
void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
{
#ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
krb5_free_error_contents(context, krberror);
#else /* MIT */
krb5_free_error(context, krberror);
#endif
}
krb5_error_code handle_krberror_packet(krb5_context context,
krb5_data *packet)
{
krb5_error_code ret;
BOOL got_error_code = False;
DEBUG(10,("handle_krberror_packet: got error packet\n"));
#ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
{
krb5_error krberror;
if ((ret = krb5_rd_error(context, packet, &krberror))) {
DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
error_message(ret)));
return ret;
}
if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
ret = (krb5_error_code) krberror.error_code;
got_error_code = True;
}
smb_krb5_free_error(context, &krberror);
}
#else /* MIT */
{
krb5_error *krberror;
if ((ret = krb5_rd_error(context, packet, &krberror))) {
DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
error_message(ret)));
return ret;
}
if (krberror->e_data.data == NULL) {
ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
got_error_code = True;
}
smb_krb5_free_error(context, krberror);
}
#endif
if (got_error_code) {
DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
error_message(ret), ret));
}
return ret;
}
krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
krb5_get_init_creds_opt **opt)
{
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
/* Heimdal or modern MIT version */
return krb5_get_init_creds_opt_alloc(context, opt);
#else
/* Historical MIT version */
krb5_get_init_creds_opt *my_opt;
*opt = NULL;
if ((my_opt = SMB_MALLOC(sizeof(krb5_get_init_creds_opt))) == NULL) {
return ENOMEM;
}
krb5_get_init_creds_opt_init(my_opt);
*opt = my_opt;
return 0;
#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
}
void smb_krb5_get_init_creds_opt_free(krb5_context context,
krb5_get_init_creds_opt *opt)
{
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
#ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
/* Modern MIT version */
krb5_get_init_creds_opt_free(context, opt);
#else
/* Heimdal version */
krb5_get_init_creds_opt_free(opt);
#endif
#else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
/* Historical MIT version */
SAFE_FREE(opt);
opt = NULL;
#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
}
krb5_error_code smb_krb5_mk_error(krb5_context context,
krb5_error_code error_code,
const krb5_principal server,
krb5_data *reply)
{
#ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
/*
* The MIT interface is *terrible*.
* We have to construct this ourselves...
*/
krb5_error e;
memset(&e, 0, sizeof(e));
krb5_us_timeofday(context, &e.stime, &e.susec);
e.server = server;
#if defined(krb5_err_base)
e.error = error_code - krb5_err_base;
#elif defined(ERROR_TABLE_BASE_krb5)
e.error = error_code - ERROR_TABLE_BASE_krb5;
#else
e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
#endif
return krb5_mk_error(context, &e, reply);
#else /* Heimdal. */
return krb5_mk_error(context,
error_code,
NULL,
NULL, /* e_data */
NULL,
server,
NULL,
NULL,
reply);
#endif
}
#else /* HAVE_KRB5 */
/* this saves a few linking headaches */
int cli_krb5_get_ticket(const char *principal, time_t time_offset,
DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
const char *ccname, time_t *tgs_expire)
{
DEBUG(0,("NO KERBEROS SUPPORT\n"));
return 1;
}
#endif
syntax highlighted by Code2HTML, v. 0.9.1