/*
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 2005-2009
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "krb5_samba.h"
#include "lib/util/asn1.h"
#ifndef KRB5_AUTHDATA_WIN2K_PAC
#define KRB5_AUTHDATA_WIN2K_PAC 128
#endif
#ifndef KRB5_AUTHDATA_IF_RELEVANT
#define KRB5_AUTHDATA_IF_RELEVANT 1
#endif
#ifdef HAVE_KRB5
#define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
#define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
#define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
bind field, flags field. */
#define GSS_C_DELEG_FLAG 1
/* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
but still has the symbol */
#if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
krb5_error_code krb5_auth_con_set_req_cksumtype(
krb5_context context,
krb5_auth_context auth_context,
krb5_cksumtype cksumtype);
#endif
#if !defined(SMB_MALLOC)
#undef malloc
#define SMB_MALLOC(s) malloc((s))
#endif
#ifndef SMB_STRDUP
#define SMB_STRDUP(s) strdup(s)
#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 */
bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
{
memset(pkaddr, '\0', sizeof(krb5_address));
#if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
if (paddr->ss_family == AF_INET6) {
pkaddr->addr_type = KRB5_ADDRESS_INET6;
pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
return true;
}
#endif
if (paddr->ss_family == AF_INET) {
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);
return true;
}
return false;
}
#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
/* MIT */
bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
{
memset(pkaddr, '\0', sizeof(krb5_address));
#if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
if (paddr->ss_family == AF_INET6) {
pkaddr->addrtype = ADDRTYPE_INET6;
pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
return true;
}
#endif
if (paddr->ss_family == AF_INET) {
pkaddr->addrtype = ADDRTYPE_INET;
pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
return true;
}
return false;
}
#else
#error UNKNOWN_ADDRTYPE
#endif
#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
/* MIT */
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 = 0;
krb5_data salt;
ret = krb5_principal2salt(context, host_princ, &salt);
if (ret) {
DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
return ret;
}
ret = krb5_c_string_to_key(context, enctype, password, &salt, key);
SAFE_FREE(salt.data);
return ret;
}
#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
/* Heimdal */
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
#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)
{
#ifdef HAVE_KRB5_PDU_NONE_DECL
return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
#else
return krb5_get_default_in_tkt_etypes(context, enctypes);
#endif
}
#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_edata_ntstatus(TALLOC_CTX *mem_ctx,
DATA_BLOB *edata,
DATA_BLOB *edata_out)
{
DATA_BLOB edata_contents;
ASN1_DATA *data;
int edata_type;
if (!edata->length) {
return false;
}
data = asn1_init(mem_ctx);
if (data == NULL) {
return false;
}
asn1_load(data, *edata);
asn1_start_tag(data, ASN1_SEQUENCE(0));
asn1_start_tag(data, ASN1_CONTEXT(1));
asn1_read_Integer(data, &edata_type);
if (edata_type != KRB5_PADATA_PW_SALT) {
DEBUG(0,("edata is not of required type %d but of type %d\n",
KRB5_PADATA_PW_SALT, edata_type));
asn1_free(data);
return false;
}
asn1_start_tag(data, ASN1_CONTEXT(2));
asn1_read_OctetString(data, talloc_tos(), &edata_contents);
asn1_end_tag(data);
asn1_end_tag(data);
asn1_end_tag(data);
asn1_free(data);
*edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
data_blob_free(&edata_contents);
return true;
}
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(talloc_tos(), 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;
}
/* Allocate and setup the auth context into the state we need. */
static krb5_error_code setup_auth_context(krb5_context context,
krb5_auth_context *auth_context)
{
krb5_error_code retval;
retval = krb5_auth_con_init(context, auth_context );
if (retval) {
DEBUG(1,("krb5_auth_con_init failed (%s)\n",
error_message(retval)));
return retval;
}
/* Ensure this is an addressless ticket. */
retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
if (retval) {
DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
error_message(retval)));
}
return retval;
}
#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
uint32_t gss_flags)
{
unsigned int orig_length = in_data->length;
unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
char *gss_cksum = NULL;
if (orig_length) {
/* Extra length field for delgated ticket. */
base_cksum_size += 4;
}
if ((unsigned int)base_cksum_size + orig_length <
(unsigned int)base_cksum_size) {
return EINVAL;
}
gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
if (gss_cksum == NULL) {
return ENOMEM;
}
memset(gss_cksum, '\0', base_cksum_size + orig_length);
SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
/*
* GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
* This matches the behavior of heimdal and mit.
*
* And it is needed to work against some closed source
* SMB servers.
*
* See bug #7883
*/
memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
SIVAL(gss_cksum, 20, gss_flags);
if (orig_length) {
SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
SSVAL(gss_cksum, 26, orig_length);
/* Copy the kerberos KRB_CRED data */
memcpy(gss_cksum + 28, in_data->data, orig_length);
free(in_data->data);
in_data->data = NULL;
in_data->length = 0;
}
in_data->data = gss_cksum;
in_data->length = base_cksum_size + orig_length;
return 0;
}
#endif
/**************************************************************
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;
size_t converted_size;
TALLOC_CTX *frame = talloc_stackframe();
if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
talloc_free(frame);
return ENOMEM;
}
ret = krb5_parse_name(context, utf8_name, principal);
TALLOC_FREE(frame);
return ret;
}
#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
void krb5_free_unparsed_name(krb5_context context, char *val)
{
SAFE_FREE(val);
}
#endif
/**************************************************************
krb5_parse_name that returns a UNIX charset name. Must
be freed with talloc_free() call.
**************************************************************/
krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
krb5_context context,
krb5_const_principal principal,
char **unix_name)
{
krb5_error_code ret;
char *utf8_name;
size_t converted_size;
*unix_name = NULL;
ret = krb5_unparse_name(context, principal, &utf8_name);
if (ret) {
return ret;
}
if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
krb5_free_unparsed_name(context, utf8_name);
return ENOMEM;
}
krb5_free_unparsed_name(context, utf8_name);
return 0;
}
krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
const char *name,
krb5_principal *principal)
{
/* 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)
{
return krb5_principal_compare_any_realm(context, princ1, princ2);
}
/*
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,
const char *impersonate_princ_s)
{
krb5_error_code retval;
krb5_principal server;
krb5_principal impersonate_princ = NULL;
krb5_creds * credsp;
krb5_creds creds;
krb5_data in_data;
bool creds_ready = false;
int i = 0, maxtries = 3;
ZERO_STRUCT(in_data);
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;
}
if (impersonate_princ_s) {
retval = smb_krb5_parse_name(context, impersonate_princ_s,
&impersonate_princ);
if (retval) {
DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
goto cleanup_princ;
}
}
/* 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 = smb_krb5_get_credentials(context, ccache,
creds.client,
creds.server,
impersonate_princ,
&credsp))) {
DEBUG(1,("ads_krb5_mk_req: smb_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(talloc_tos(), (unsigned)credsp->times.endtime),
(unsigned)credsp->times.endtime));
if (expire_time) {
*expire_time = (time_t)credsp->times.endtime;
}
/* Allocate the auth_context. */
retval = setup_auth_context(context, auth_context);
if (retval) {
DEBUG(1,("setup_auth_context failed (%s)\n",
error_message(retval)));
goto cleanup_creds;
}
#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
{
uint32_t gss_flags = 0;
if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
/* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
as part of the kerberos exchange. */
DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
retval = krb5_auth_con_setuseruserkey(context,
*auth_context,
&credsp->keyblock );
if (retval) {
DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
error_message(retval)));
goto cleanup_creds;
}
/* Must use a subkey for forwarded tickets. */
retval = krb5_auth_con_setflags(context,
*auth_context,
KRB5_AUTH_CONTEXT_USE_SUBKEY);
if (retval) {
DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
error_message(retval)));
goto cleanup_creds;
}
retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
*auth_context, /* Authentication context [in] */
discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
credsp->client, /* Client principal for the tgt [in] */
credsp->server, /* Server principal for the tgt [in] */
ccache, /* Credential cache to use for storage [in] */
1, /* Turn on for "Forwardable ticket" [in] */
&in_data ); /* Resulting response [out] */
if (retval) {
DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
error_message( retval ) ) );
/*
* This is not fatal. Delete the *auth_context and continue
* with krb5_mk_req_extended to get a non-forwardable ticket.
*/
if (in_data.data) {
free( in_data.data );
in_data.data = NULL;
in_data.length = 0;
}
krb5_auth_con_free(context, *auth_context);
*auth_context = NULL;
retval = setup_auth_context(context, auth_context);
if (retval) {
DEBUG(1,("setup_auth_context failed (%s)\n",
error_message(retval)));
goto cleanup_creds;
}
} else {
/* We got a delegated ticket. */
gss_flags |= GSS_C_DELEG_FLAG;
}
}
/* Frees and reallocates in_data into a GSS checksum blob. */
retval = create_gss_checksum(&in_data, gss_flags);
if (retval) {
goto cleanup_data;
}
/* We always want GSS-checksum types. */
retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
if (retval) {
DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
error_message(retval)));
goto cleanup_data;
}
}
#endif
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)));
}
#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
cleanup_data:
#endif
if (in_data.data) {
free( in_data.data );
in_data.length = 0;
}
krb5_free_creds(context, credsp);
cleanup_creds:
krb5_free_cred_contents(context, &creds);
cleanup_princ:
krb5_free_principal(context, server);
if (impersonate_princ) {
krb5_free_principal(context, impersonate_princ);
}
return retval;
}
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);
}
#elif defined(HAVE_KRB5_DATA_FREE)
krb5_data_free(context, pdata);
#else
SAFE_FREE(pdata->data);
#endif
}
/*
get a kerberos5 ticket for the given service
*/
int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
const char *principal, time_t time_offset,
DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
uint32_t extra_ap_opts, const char *ccname,
time_t *tgs_expire,
const char *impersonate_princ_s)
{
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[] = {
ENCTYPE_ARCFOUR_HMAC,
ENCTYPE_DES_CBC_MD5,
ENCTYPE_DES_CBC_CRC,
ENCTYPE_NULL};
initialize_krb5_error_table();
retval = krb5_init_context(&context);
if (retval) {
DEBUG(1, ("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, ("krb5_cc_default failed (%s)\n",
error_message(retval)));
goto failed;
}
if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
error_message(retval)));
goto failed;
}
retval = ads_krb5_mk_req(context, &auth_context,
AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
principal, ccdef, &packet,
tgs_expire, impersonate_princ_s);
if (retval) {
goto failed;
}
get_krb5_smb_session_key(mem_ctx, context, auth_context,
session_key_krb5, false);
*ticket = data_blob_talloc(mem_ctx, 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(TALLOC_CTX *mem_ctx,
krb5_context context,
krb5_auth_context auth_context,
DATA_BLOB *session_key, bool remote)
{
krb5_keyblock *skey = NULL;
krb5_error_code err = 0;
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 || skey == NULL) {
DEBUG(10, ("KRB5 error getting session key %d\n", err));
goto done;
}
DEBUG(10, ("Got KRB5 session key of length %d\n",
(int)KRB5_KEY_LENGTH(skey)));
*session_key = data_blob_talloc(mem_ctx,
KRB5_KEY_DATA(skey),
KRB5_KEY_LENGTH(skey));
dump_data_pw("KRB5 Session Key:\n",
session_key->data,
session_key->length);
ret = true;
done:
if (skey) {
krb5_free_keyblock(context, skey);
}
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 = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
kdata.length = strlen((const char *)kdata.data);
return &kdata;
}
#endif
/* Prototypes */
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;
krb5_creds creds, creds_in, *creds_out = NULL;
ZERO_STRUCT(creds);
ZERO_STRUCT(creds_in);
initialize_krb5_error_table();
ret = krb5_init_context(&context);
if (ret) {
goto done;
}
if (!ccache_string) {
ccache_string = krb5_cc_default_name(context);
}
if (!ccache_string) {
ret = EINVAL;
goto done;
}
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, discard_const_p(char, ccache_string), &ccache);
if (ret) {
goto done;
}
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, discard_const_p(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;
}
done:
krb5_free_cred_contents(context, &creds_in);
if (creds_out) {
krb5_free_creds(context, creds_out);
} else {
krb5_free_cred_contents(context, &creds);
}
if (client) {
krb5_free_principal(context, client);
}
if (ccache) {
krb5_cc_close(context, ccache);
}
if (context) {
krb5_free_context(context);
}
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;
}
#define MAX_NETBIOSNAME_LEN 16
krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
const char *netbios_name)
{
krb5_error_code ret = 0;
char buf[MAX_NETBIOSNAME_LEN];
int len;
#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;
}
/* temporarily duplicate put_name() code here to avoid dependency
* issues for a 5 lines function */
len = strlen(netbios_name);
memcpy(buf, netbios_name,
(len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
if (len < MAX_NETBIOSNAME_LEN - 1) {
memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
}
buf[MAX_NETBIOSNAME_LEN - 1] = 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) {
#if defined(ERROR_TABLE_BASE_krb5)
ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
#else
ret = (krb5_error_code)krberror->error;
#endif
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)
{
/* Heimdal or modern MIT version */
return krb5_get_init_creds_opt_alloc(context, opt);
}
void smb_krb5_get_init_creds_opt_free(krb5_context context,
krb5_get_init_creds_opt *opt)
{
/* Modern MIT or Heimdal version */
krb5_get_init_creds_opt_free(context, opt);
}
krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
{
return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
}
krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
krb5_keytab_entry *kt_entry)
{
/* Try krb5_free_keytab_entry_contents first, since
* MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
* krb5_kt_free_entry but only has a prototype for the first, while the
* second is considered private.
*/
#if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
return krb5_free_keytab_entry_contents(context, kt_entry);
#elif defined(HAVE_KRB5_KT_FREE_ENTRY)
return krb5_kt_free_entry(context, kt_entry);
#else
#error UNKNOWN_KT_FREE_FUNCTION
#endif
}
/* caller needs to free etype_s */
krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
krb5_enctype enctype,
char **etype_s)
{
#ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
#elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
char buf[256];
krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
if (ret) {
return ret;
}
*etype_s = SMB_STRDUP(buf);
if (!*etype_s) {
return ENOMEM;
}
return ret;
#else
#error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
#endif
}
/**********************************************************************
* Open a krb5 keytab with flags, handles readonly or readwrite access and
* allows to process non-default keytab names.
* @param context krb5_context
* @param keytab_name_req string
* @param write_access bool if writable keytab is required
* @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
* @return krb5_error_code
**********************************************************************/
/* This MAX_NAME_LEN is a constant defined in krb5.h */
#ifndef MAX_KEYTAB_NAME_LEN
#define MAX_KEYTAB_NAME_LEN 1100
#endif
krb5_error_code smb_krb5_open_keytab(krb5_context context,
const char *keytab_name_req,
bool write_access,
krb5_keytab *keytab)
{
krb5_error_code ret = 0;
TALLOC_CTX *mem_ctx;
char keytab_string[MAX_KEYTAB_NAME_LEN];
char *kt_str = NULL;
bool found_valid_name = false;
const char *pragma = "FILE";
const char *tmp = NULL;
if (!write_access && !keytab_name_req) {
/* caller just wants to read the default keytab readonly, so be it */
return krb5_kt_default(context, keytab);
}
mem_ctx = talloc_init("smb_krb5_open_keytab");
if (!mem_ctx) {
return ENOMEM;
}
#ifdef HAVE_WRFILE_KEYTAB
if (write_access) {
pragma = "WRFILE";
}
#endif
if (keytab_name_req) {
if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
ret = KRB5_CONFIG_NOTENUFSPACE;
goto out;
}
if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
(strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
tmp = keytab_name_req;
goto resolve;
}
if (keytab_name_req[0] != '/') {
ret = KRB5_KT_BADNAME;
goto out;
}
tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
if (!tmp) {
ret = ENOMEM;
goto out;
}
goto resolve;
}
/* we need to handle more complex keytab_strings, like:
* "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
if (ret) {
goto out;
}
DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
tmp = talloc_strdup(mem_ctx, keytab_string);
if (!tmp) {
ret = ENOMEM;
goto out;
}
if (strncmp(tmp, "ANY:", 4) == 0) {
tmp += 4;
}
memset(&keytab_string, '\0', sizeof(keytab_string));
while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
if (strncmp(kt_str, "WRFILE:", 7) == 0) {
found_valid_name = true;
tmp = kt_str;
tmp += 7;
}
if (strncmp(kt_str, "FILE:", 5) == 0) {
found_valid_name = true;
tmp = kt_str;
tmp += 5;
}
if (tmp[0] == '/') {
/* Treat as a FILE: keytab definition. */
found_valid_name = true;
}
if (found_valid_name) {
if (tmp[0] != '/') {
ret = KRB5_KT_BADNAME;
goto out;
}
tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
if (!tmp) {
ret = ENOMEM;
goto out;
}
break;
}
}
if (!found_valid_name) {
ret = KRB5_KT_UNKNOWN_TYPE;
goto out;
}
resolve:
DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
ret = krb5_kt_resolve(context, tmp, keytab);
out:
TALLOC_FREE(mem_ctx);
return ret;
}
krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
krb5_context context,
krb5_keytab keytab,
const char **keytab_name)
{
char keytab_string[MAX_KEYTAB_NAME_LEN];
krb5_error_code ret = 0;
ret = krb5_kt_get_name(context, keytab,
keytab_string, MAX_KEYTAB_NAME_LEN - 2);
if (ret) {
return ret;
}
*keytab_name = talloc_strdup(mem_ctx, keytab_string);
if (!*keytab_name) {
return ENOMEM;
}
return ret;
}
#if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
defined(HAVE_KRB5_GET_CREDS)
static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
krb5_ccache ccache,
krb5_principal me,
krb5_principal server,
krb5_principal impersonate_princ,
krb5_creds **out_creds)
{
krb5_error_code ret;
krb5_get_creds_opt opt;
ret = krb5_get_creds_opt_alloc(context, &opt);
if (ret) {
goto done;
}
krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
if (impersonate_princ) {
ret = krb5_get_creds_opt_set_impersonate(context, opt,
impersonate_princ);
if (ret) {
goto done;
}
}
ret = krb5_get_creds(context, opt, ccache, server, out_creds);
if (ret) {
goto done;
}
done:
if (opt) {
krb5_get_creds_opt_free(context, opt);
}
return ret;
}
#endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
#ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
krb5_ccache ccache,
krb5_principal me,
krb5_principal server,
krb5_principal impersonate_princ,
krb5_creds **out_creds)
{
krb5_error_code ret;
krb5_creds in_creds;
#if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
krb5_error_code KRB5_CALLCONV
krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
krb5_ccache ccache, krb5_creds *in_creds,
krb5_data *subject_cert,
krb5_creds **out_creds);
#endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
ZERO_STRUCT(in_creds);
if (impersonate_princ) {
in_creds.server = me;
in_creds.client = impersonate_princ;
ret = krb5_get_credentials_for_user(context,
0, /* krb5_flags options */
ccache,
&in_creds,
NULL, /* krb5_data *subject_cert */
out_creds);
} else {
in_creds.client = me;
in_creds.server = server;
ret = krb5_get_credentials(context, 0, ccache,
&in_creds, out_creds);
}
return ret;
}
#endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
/*
* smb_krb5_get_credentials
*
* @brief Get krb5 credentials for a server
*
* @param[in] context An initialized krb5_context
* @param[in] ccache An initialized krb5_ccache
* @param[in] me The krb5_principal of the caller
* @param[in] server The krb5_principal of the requested service
* @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
* @param[out] out_creds The returned krb5_creds structure
* @return krb5_error_code
*
*/
krb5_error_code smb_krb5_get_credentials(krb5_context context,
krb5_ccache ccache,
krb5_principal me,
krb5_principal server,
krb5_principal impersonate_princ,
krb5_creds **out_creds)
{
krb5_error_code ret;
krb5_creds *creds = NULL;
*out_creds = NULL;
if (impersonate_princ) {
#ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
#elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
#else
ret = ENOTSUP;
#endif
} else {
krb5_creds in_creds;
ZERO_STRUCT(in_creds);
in_creds.client = me;
in_creds.server = server;
ret = krb5_get_credentials(context, 0, ccache,
&in_creds, &creds);
}
if (ret) {
goto done;
}
if (out_creds) {
*out_creds = creds;
}
done:
if (creds && ret) {
krb5_free_creds(context, creds);
}
return ret;
}
/*
* smb_krb5_get_creds
*
* @brief Get krb5 credentials for a server
*
* @param[in] server_s The string name of the service
* @param[in] time_offset The offset to the KDCs time in seconds (optional)
* @param[in] cc The krb5 credential cache string name (optional)
* @param[in] impersonate_princ_s The string principal name to impersonate (optional)
* @param[out] creds_p The returned krb5_creds structure
* @return krb5_error_code
*
*/
krb5_error_code smb_krb5_get_creds(const char *server_s,
time_t time_offset,
const char *cc,
const char *impersonate_princ_s,
krb5_creds **creds_p)
{
krb5_error_code ret;
krb5_context context = NULL;
krb5_principal me = NULL;
krb5_principal server = NULL;
krb5_principal impersonate_princ = NULL;
krb5_creds *creds = NULL;
krb5_ccache ccache = NULL;
*creds_p = NULL;
initialize_krb5_error_table();
ret = krb5_init_context(&context);
if (ret) {
goto done;
}
if (time_offset != 0) {
krb5_set_real_time(context, time(NULL) + time_offset, 0);
}
ret = krb5_cc_resolve(context, cc ? cc :
krb5_cc_default_name(context), &ccache);
if (ret) {
goto done;
}
ret = krb5_cc_get_principal(context, ccache, &me);
if (ret) {
goto done;
}
ret = smb_krb5_parse_name(context, server_s, &server);
if (ret) {
goto done;
}
if (impersonate_princ_s) {
ret = smb_krb5_parse_name(context, impersonate_princ_s,
&impersonate_princ);
if (ret) {
goto done;
}
}
ret = smb_krb5_get_credentials(context, ccache,
me, server, impersonate_princ,
&creds);
if (ret) {
goto done;
}
ret = krb5_cc_store_cred(context, ccache, creds);
if (ret) {
goto done;
}
if (creds_p) {
*creds_p = creds;
}
DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
server_s));
if (impersonate_princ_s) {
char *client = NULL;
ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
if (ret) {
goto done;
}
DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
client));
TALLOC_FREE(client);
}
done:
if (!context) {
return ret;
}
if (creds && ret) {
krb5_free_creds(context, creds);
}
if (server) {
krb5_free_principal(context, server);
}
if (me) {
krb5_free_principal(context, me);
}
if (impersonate_princ) {
krb5_free_principal(context, impersonate_princ);
}
if (ccache) {
krb5_cc_close(context, ccache);
}
krb5_free_context(context);
return ret;
}
krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
krb5_enctype enctype,
const void *data,
size_t length,
krb5_keyblock *key)
{
#if defined(HAVE_KRB5_KEYBLOCK_INIT)
return krb5_keyblock_init(context, enctype, data, length, key);
#else
memset(key, 0, sizeof(krb5_keyblock));
KRB5_KEY_DATA(key) = SMB_MALLOC(length);
if (NULL == KRB5_KEY_DATA(key)) {
return ENOMEM;
}
memcpy(KRB5_KEY_DATA(key), data, length);
KRB5_KEY_LENGTH(key) = length;
KRB5_KEY_TYPE(key) = enctype;
return 0;
#endif
}
/*
simulate a kinit, putting the tgt in the given credentials cache.
Orignally by remus@snapserver.com
This version is built to use a keyblock, rather than needing the
original password.
The impersonate_principal is the principal if NULL, or the principal
to impersonate
The target_service defaults to the krbtgt if NULL, but could be
kpasswd/realm or the local service (if we are doing s4u2self)
*/
krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
krb5_principal principal,
krb5_keyblock *keyblock,
const char *target_service,
krb5_get_init_creds_opt *krb_options,
time_t *expire_time,
time_t *kdc_time)
{
krb5_error_code code = 0;
krb5_creds my_creds;
#if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
keyblock, 0, target_service,
krb_options);
#elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
{
#define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
krb5_keytab_entry entry;
krb5_keytab keytab;
memset(&entry, 0, sizeof(entry));
entry.principal = principal;
*(KRB5_KT_KEY(&entry)) = *keyblock;
memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
mktemp(tmp_name);
if (tmp_name[0] == 0) {
return KRB5_KT_BADNAME;
}
code = krb5_kt_resolve(ctx, tmp_name, &keytab);
if (code) {
return code;
}
code = krb5_kt_add_entry(ctx, keytab, &entry);
if (code) {
(void)krb5_kt_close(ctx, keytab);
goto done;
}
code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
keytab, 0, target_service,
krb_options);
(void)krb5_kt_close(ctx, keytab);
}
#else
#error krb5_get_init_creds_keyblock not available!
#endif
if (code) {
return code;
}
code = krb5_cc_initialize(ctx, cc, principal);
if (code) {
goto done;
}
code = krb5_cc_store_cred(ctx, cc, &my_creds);
if (code) {
goto done;
}
if (expire_time) {
*expire_time = (time_t) my_creds.times.endtime;
}
if (kdc_time) {
*kdc_time = (time_t) my_creds.times.starttime;
}
code = 0;
done:
krb5_free_cred_contents(ctx, &my_creds);
return code;
}
krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
krb5_principal principal,
const char *password,
const char *target_service,
krb5_get_init_creds_opt *krb_options,
time_t *expire_time,
time_t *kdc_time)
{
krb5_error_code code = 0;
krb5_creds my_creds;
code = krb5_get_init_creds_password(ctx, &my_creds, principal,
password, NULL, NULL, 0,
target_service, krb_options);
if (code) {
return code;
}
code = krb5_cc_initialize(ctx, cc, principal);
if (code) {
goto done;
}
code = krb5_cc_store_cred(ctx, cc, &my_creds);
if (code) {
goto done;
}
if (expire_time) {
*expire_time = (time_t) my_creds.times.endtime;
}
if (kdc_time) {
*kdc_time = (time_t) my_creds.times.starttime;
}
code = 0;
done:
krb5_free_cred_contents(ctx, &my_creds);
return code;
}
#ifdef SAMBA4_USES_HEIMDAL
/*
simulate a kinit, putting the tgt in the given credentials cache.
Orignally by remus@snapserver.com
The impersonate_principal is the principal
The self_service, should be the local service (for S4U2Self if
impersonate_principal is given).
The target_service defaults to the krbtgt if NULL, but could be
kpasswd/realm or a remote service (for S4U2Proxy)
*/
krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
krb5_ccache store_cc,
krb5_principal init_principal,
const char *init_password,
krb5_principal impersonate_principal,
const char *self_service,
const char *target_service,
krb5_get_init_creds_opt *krb_options,
time_t *expire_time,
time_t *kdc_time)
{
krb5_error_code code = 0;
krb5_get_creds_opt options;
krb5_principal store_principal;
krb5_creds store_creds;
krb5_creds *s4u2self_creds;
Ticket s4u2self_ticket;
size_t s4u2self_ticketlen;
krb5_creds *s4u2proxy_creds;
krb5_principal self_princ;
bool s4u2proxy;
krb5_principal target_princ;
krb5_ccache tmp_cc;
const char *self_realm;
krb5_principal blacklist_principal = NULL;
krb5_principal whitelist_principal = NULL;
code = krb5_get_init_creds_password(ctx, &store_creds,
init_principal,
init_password,
NULL, NULL,
0,
NULL,
krb_options);
if (code != 0) {
return code;
}
store_principal = init_principal;
/*
* We are trying S4U2Self now:
*
* As we do not want to expose our TGT in the
* krb5_ccache, which is also holds the impersonated creds.
*
* Some low level krb5/gssapi function might use the TGT
* identity and let the client act as our machine account.
*
* We need to avoid that and use a temporary krb5_ccache
* in order to pass our TGT to the krb5_get_creds() function.
*/
code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
if (code != 0) {
krb5_free_cred_contents(ctx, &store_creds);
return code;
}
code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
if (code != 0) {
krb5_cc_destroy(ctx, tmp_cc);
krb5_free_cred_contents(ctx, &store_creds);
return code;
}
code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
if (code != 0) {
krb5_free_cred_contents(ctx, &store_creds);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
/*
* we need to remember the client principal of our
* TGT and make sure the KDC does not return this
* in the impersonated tickets. This can happen
* if the KDC does not support S4U2Self and S4U2Proxy.
*/
blacklist_principal = store_creds.client;
store_creds.client = NULL;
krb5_free_cred_contents(ctx, &store_creds);
/*
* Check if we also need S4U2Proxy or if S4U2Self is
* enough in order to get a ticket for the target.
*/
if (target_service == NULL) {
s4u2proxy = false;
} else if (strcmp(target_service, self_service) == 0) {
s4u2proxy = false;
} else {
s4u2proxy = true;
}
/*
* For S4U2Self we need our own service principal,
* which belongs to our own realm (available on
* our client principal).
*/
self_realm = krb5_principal_get_realm(ctx, init_principal);
code = krb5_parse_name(ctx, self_service, &self_princ);
if (code != 0) {
krb5_free_principal(ctx, blacklist_principal);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
code = krb5_principal_set_realm(ctx, self_princ, self_realm);
if (code != 0) {
krb5_free_principal(ctx, blacklist_principal);
krb5_free_principal(ctx, self_princ);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
code = krb5_get_creds_opt_alloc(ctx, &options);
if (code != 0) {
krb5_free_principal(ctx, blacklist_principal);
krb5_free_principal(ctx, self_princ);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
if (s4u2proxy) {
/*
* If we want S4U2Proxy, we need the forwardable flag
* on the S4U2Self ticket.
*/
krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
}
code = krb5_get_creds_opt_set_impersonate(ctx, options,
impersonate_principal);
if (code != 0) {
krb5_get_creds_opt_free(ctx, options);
krb5_free_principal(ctx, blacklist_principal);
krb5_free_principal(ctx, self_princ);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
code = krb5_get_creds(ctx, options, tmp_cc,
self_princ, &s4u2self_creds);
krb5_get_creds_opt_free(ctx, options);
krb5_free_principal(ctx, self_princ);
if (code != 0) {
krb5_free_principal(ctx, blacklist_principal);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
if (!s4u2proxy) {
krb5_cc_destroy(ctx, tmp_cc);
/*
* Now make sure we store the impersonated principal
* and creds instead of the TGT related stuff
* in the krb5_ccache of the caller.
*/
code = krb5_copy_creds_contents(ctx, s4u2self_creds,
&store_creds);
krb5_free_creds(ctx, s4u2self_creds);
if (code != 0) {
return code;
}
/*
* It's important to store the principal the KDC
* returned, as otherwise the caller would not find
* the S4U2Self ticket in the krb5_ccache lookup.
*/
store_principal = store_creds.client;
goto store;
}
/*
* We are trying S4U2Proxy:
*
* We need the ticket from the S4U2Self step
* and our TGT in order to get the delegated ticket.
*/
code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
s4u2self_creds->ticket.length,
&s4u2self_ticket,
&s4u2self_ticketlen);
if (code != 0) {
krb5_free_creds(ctx, s4u2self_creds);
krb5_free_principal(ctx, blacklist_principal);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
/*
* we need to remember the client principal of the
* S4U2Self stage and as it needs to match the one we
* will get for the S4U2Proxy stage. We need this
* in order to detect KDCs which does not support S4U2Proxy.
*/
whitelist_principal = s4u2self_creds->client;
s4u2self_creds->client = NULL;
krb5_free_creds(ctx, s4u2self_creds);
/*
* For S4U2Proxy we also got a target service principal,
* which also belongs to our own realm (available on
* our client principal).
*/
code = krb5_parse_name(ctx, target_service, &target_princ);
if (code != 0) {
free_Ticket(&s4u2self_ticket);
krb5_free_principal(ctx, whitelist_principal);
krb5_free_principal(ctx, blacklist_principal);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
code = krb5_principal_set_realm(ctx, target_princ, self_realm);
if (code != 0) {
free_Ticket(&s4u2self_ticket);
krb5_free_principal(ctx, target_princ);
krb5_free_principal(ctx, whitelist_principal);
krb5_free_principal(ctx, blacklist_principal);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
code = krb5_get_creds_opt_alloc(ctx, &options);
if (code != 0) {
free_Ticket(&s4u2self_ticket);
krb5_free_principal(ctx, target_princ);
krb5_free_principal(ctx, whitelist_principal);
krb5_free_principal(ctx, blacklist_principal);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
free_Ticket(&s4u2self_ticket);
if (code != 0) {
krb5_get_creds_opt_free(ctx, options);
krb5_free_principal(ctx, target_princ);
krb5_free_principal(ctx, whitelist_principal);
krb5_free_principal(ctx, blacklist_principal);
krb5_cc_destroy(ctx, tmp_cc);
return code;
}
code = krb5_get_creds(ctx, options, tmp_cc,
target_princ, &s4u2proxy_creds);
krb5_get_creds_opt_free(ctx, options);
krb5_free_principal(ctx, target_princ);
krb5_cc_destroy(ctx, tmp_cc);
if (code != 0) {
krb5_free_principal(ctx, whitelist_principal);
krb5_free_principal(ctx, blacklist_principal);
return code;
}
/*
* Now make sure we store the impersonated principal
* and creds instead of the TGT related stuff
* in the krb5_ccache of the caller.
*/
code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
&store_creds);
krb5_free_creds(ctx, s4u2proxy_creds);
if (code != 0) {
krb5_free_principal(ctx, whitelist_principal);
krb5_free_principal(ctx, blacklist_principal);
return code;
}
/*
* It's important to store the principal the KDC
* returned, as otherwise the caller would not find
* the S4U2Self ticket in the krb5_ccache lookup.
*/
store_principal = store_creds.client;
store:
if (blacklist_principal &&
krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
char *sp = NULL;
char *ip = NULL;
code = krb5_unparse_name(ctx, blacklist_principal, &sp);
if (code != 0) {
sp = NULL;
}
code = krb5_unparse_name(ctx, impersonate_principal, &ip);
if (code != 0) {
ip = NULL;
}
DEBUG(1, ("kerberos_kinit_password_cc: "
"KDC returned self principal[%s] while impersonating [%s]\n",
sp?sp:"<no memory>",
ip?ip:"<no memory>"));
SAFE_FREE(sp);
SAFE_FREE(ip);
krb5_free_principal(ctx, whitelist_principal);
krb5_free_principal(ctx, blacklist_principal);
krb5_free_cred_contents(ctx, &store_creds);
return KRB5_FWD_BAD_PRINCIPAL;
}
if (blacklist_principal) {
krb5_free_principal(ctx, blacklist_principal);
}
if (whitelist_principal &&
!krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
char *sp = NULL;
char *ep = NULL;
code = krb5_unparse_name(ctx, store_creds.client, &sp);
if (code != 0) {
sp = NULL;
}
code = krb5_unparse_name(ctx, whitelist_principal, &ep);
if (code != 0) {
ep = NULL;
}
DEBUG(1, ("kerberos_kinit_password_cc: "
"KDC returned wrong principal[%s] we expected [%s]\n",
sp?sp:"<no memory>",
ep?ep:"<no memory>"));
SAFE_FREE(sp);
SAFE_FREE(ep);
krb5_free_principal(ctx, whitelist_principal);
krb5_free_cred_contents(ctx, &store_creds);
return KRB5_FWD_BAD_PRINCIPAL;
}
if (whitelist_principal) {
krb5_free_principal(ctx, whitelist_principal);
}
code = krb5_cc_initialize(ctx, store_cc, store_principal);
if (code != 0) {
krb5_free_cred_contents(ctx, &store_creds);
return code;
}
code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
if (code != 0) {
krb5_free_cred_contents(ctx, &store_creds);
return code;
}
if (expire_time) {
*expire_time = (time_t) store_creds.times.endtime;
}
if (kdc_time) {
*kdc_time = (time_t) store_creds.times.starttime;
}
krb5_free_cred_contents(ctx, &store_creds);
return 0;
}
#endif
#if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
krb5_error_code smb_krb5_make_principal(krb5_context context,
krb5_principal *principal,
const char *_realm, ...)
{
krb5_error_code code;
bool free_realm;
char *realm;
va_list ap;
if (_realm) {
realm = _realm;
free_realm = false;
} else {
code = krb5_get_default_realm(context, &realm);
if (code) {
return code;
}
free_realm = true;
}
va_start(ap, _realm);
code = krb5_build_principal_alloc_va(context, principal,
strlen(realm), realm,
ap);
va_end(ap);
if (free_realm) {
krb5_free_default_realm(context, &realm);
}
return code;
}
#endif
#if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
/**
* @brief Get the lifetime of the initial ticket in the cache.
*
* @param[in] context The kerberos context.
*
* @param[in] id The credential cache to get the ticket lifetime.
*
* @param[out] t A pointer to a time value to store the lifetime.
*
* @return 0 on success, a krb5_error_code on error.
*/
krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
krb5_ccache id,
time_t *t)
{
krb5_error_code rc;
krb5_creds mcreds;
krb5_creds creds;
krb5_timestamp now;
ZERO_STRUCT(mcreds);
mcreds.ticket_flags = TKT_FLG_INITIAL;
rc = krb5_cc_retrieve_cred(context,
id,
KRB5_TC_MATCH_FLAGS,
&mcreds,
&creds);
if (rc != 0) {
return rc;
}
rc = krb5_timeofday(context, &now);
if (rc != 0) {
return rc;
}
*t = (time_t) (creds.times.endtime - now);
krb5_free_creds(context, &creds);
return 0;
}
#endif /* HAVE_KRB5_CC_GET_LIFETIME */
/*
* smb_krb5_principal_get_realm
*
* @brief Get realm of a principal
*
* @param[in] context The krb5_context
* @param[in] principal The principal
* @return pointer to the realm
*
*/
char *smb_krb5_principal_get_realm(krb5_context context,
krb5_principal principal)
{
#ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
return discard_const_p(char, krb5_principal_get_realm(context, principal));
#elif defined(krb5_princ_realm) /* MIT */
krb5_data *realm;
realm = krb5_princ_realm(context, principal);
return discard_const_p(char, realm->data);
#else
return NULL;
#endif
}
/************************************************************************
Routine to get the default realm from the kerberos credentials cache.
Caller must free if the return value is not NULL.
************************************************************************/
static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
{
char *realm = NULL;
krb5_context ctx = NULL;
krb5_ccache cc = NULL;
krb5_principal princ = NULL;
initialize_krb5_error_table();
if (krb5_init_context(&ctx)) {
return NULL;
}
DEBUG(5,("kerberos_get_default_realm_from_ccache: "
"Trying to read krb5 cache: %s\n",
krb5_cc_default_name(ctx)));
if (krb5_cc_default(ctx, &cc)) {
DEBUG(0,("kerberos_get_default_realm_from_ccache: "
"failed to read default cache\n"));
goto out;
}
if (krb5_cc_get_principal(ctx, cc, &princ)) {
DEBUG(0,("kerberos_get_default_realm_from_ccache: "
"failed to get default principal\n"));
goto out;
}
#if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
#elif defined(HAVE_KRB5_PRINC_REALM)
{
krb5_data *realm_data = krb5_princ_realm(ctx, princ);
realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
}
#endif
out:
if (ctx) {
if (princ) {
krb5_free_principal(ctx, princ);
}
if (cc) {
krb5_cc_close(ctx, cc);
}
krb5_free_context(ctx);
}
return realm;
}
/************************************************************************
Routine to get the realm from a given DNS name.
************************************************************************/
static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
const char *hostname)
{
#if defined(HAVE_KRB5_REALM_TYPE)
/* Heimdal. */
krb5_realm *realm_list = NULL;
#else
/* MIT */
char **realm_list = NULL;
#endif
char *realm = NULL;
krb5_error_code kerr;
krb5_context ctx = NULL;
initialize_krb5_error_table();
if (krb5_init_context(&ctx)) {
return NULL;
}
kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
if (kerr != 0) {
DEBUG(3,("kerberos_get_realm_from_hostname %s: "
"failed %s\n",
hostname ? hostname : "(NULL)",
error_message(kerr) ));
goto out;
}
if (realm_list && realm_list[0]) {
realm = talloc_strdup(mem_ctx, realm_list[0]);
}
out:
if (ctx) {
if (realm_list) {
krb5_free_host_realm(ctx, realm_list);
realm_list = NULL;
}
krb5_free_context(ctx);
ctx = NULL;
}
return realm;
}
char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
const char *service,
const char *remote_name,
const char *default_realm)
{
char *realm = NULL;
char *host = NULL;
char *principal;
host = strchr_m(remote_name, '.');
if (host) {
/* DNS name. */
realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
remote_name);
} else {
/* NetBIOS name - use our realm. */
realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
}
if (realm == NULL || *realm == '\0') {
realm = talloc_strdup(talloc_tos(), default_realm);
if (!realm) {
return NULL;
}
DEBUG(3,("kerberos_get_principal_from_service_hostname: "
"cannot get realm from, "
"desthost %s or default ccache. Using default "
"smb.conf realm %s\n",
remote_name,
realm));
}
principal = talloc_asprintf(mem_ctx,
"%s/%s@%s",
service, remote_name,
realm);
TALLOC_FREE(realm);
return principal;
}
char *smb_get_krb5_error_message(krb5_context context,
krb5_error_code code,
TALLOC_CTX *mem_ctx)
{
char *ret;
#if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
const char *context_error = krb5_get_error_message(context, code);
if (context_error) {
ret = talloc_asprintf(mem_ctx, "%s: %s",
error_message(code), context_error);
krb5_free_error_message(context, context_error);
return ret;
}
#endif
ret = talloc_strdup(mem_ctx, error_message(code));
return ret;
}
#else /* HAVE_KRB5 */
/* this saves a few linking headaches */
int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
const char *principal, time_t time_offset,
DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
uint32_t extra_ap_opts,
const char *ccname, time_t *tgs_expire,
const char *impersonate_princ_s)
{
DEBUG(0,("NO KERBEROS SUPPORT\n"));
return 1;
}
#endif /* HAVE_KRB5 */