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https://github.com/samba-team/samba.git
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5f92c81fb6
Signed-off-by: Andreas Schneider <asn@samba.org> Reviewed-by: Michael Adam <obnox@samba.org>
2357 lines
60 KiB
C
2357 lines
60 KiB
C
/*
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Unix SMB/CIFS implementation.
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simple kerberos5 routines for active directory
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Copyright (C) Andrew Tridgell 2001
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Copyright (C) Luke Howard 2002-2003
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
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Copyright (C) Guenther Deschner 2005-2009
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "system/filesys.h"
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#include "krb5_samba.h"
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#include "lib/util/asn1.h"
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#ifndef KRB5_AUTHDATA_WIN2K_PAC
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#define KRB5_AUTHDATA_WIN2K_PAC 128
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#endif
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#ifndef KRB5_AUTHDATA_IF_RELEVANT
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#define KRB5_AUTHDATA_IF_RELEVANT 1
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#endif
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#ifdef HAVE_KRB5
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#define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
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#define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
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#define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
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bind field, flags field. */
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#define GSS_C_DELEG_FLAG 1
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/* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
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but still has the symbol */
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#if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
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krb5_error_code krb5_auth_con_set_req_cksumtype(
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krb5_context context,
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krb5_auth_context auth_context,
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krb5_cksumtype cksumtype);
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#endif
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#if !defined(SMB_MALLOC)
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#undef malloc
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#define SMB_MALLOC(s) malloc((s))
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#endif
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#ifndef SMB_STRDUP
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#define SMB_STRDUP(s) strdup(s)
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#endif
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#if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
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#if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
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/* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
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* to krb5_set_default_tgs_ktypes. See
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* http://lists.samba.org/archive/samba-technical/2006-July/048271.html
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*
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* If the MIT libraries are not exporting internal symbols, we will end up in
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* this branch, which is correct. Otherwise we will continue to use the
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* internal symbol
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*/
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krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
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{
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return krb5_set_default_tgs_enctypes(ctx, enc);
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}
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#elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
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/* Heimdal */
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krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
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{
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return krb5_set_default_in_tkt_etypes(ctx, enc);
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}
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#endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
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#endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
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#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
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/* HEIMDAL */
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bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
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{
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memset(pkaddr, '\0', sizeof(krb5_address));
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#if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
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if (paddr->ss_family == AF_INET6) {
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pkaddr->addr_type = KRB5_ADDRESS_INET6;
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pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
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pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
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return true;
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}
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#endif
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if (paddr->ss_family == AF_INET) {
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pkaddr->addr_type = KRB5_ADDRESS_INET;
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pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
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pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
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return true;
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}
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return false;
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}
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#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
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/* MIT */
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bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
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{
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memset(pkaddr, '\0', sizeof(krb5_address));
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#if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
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if (paddr->ss_family == AF_INET6) {
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pkaddr->addrtype = ADDRTYPE_INET6;
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pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
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pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
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return true;
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}
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#endif
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if (paddr->ss_family == AF_INET) {
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pkaddr->addrtype = ADDRTYPE_INET;
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pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
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pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
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return true;
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}
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return false;
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}
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#else
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#error UNKNOWN_ADDRTYPE
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#endif
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#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
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/* MIT */
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int create_kerberos_key_from_string_direct(krb5_context context,
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krb5_principal host_princ,
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krb5_data *password,
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krb5_keyblock *key,
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krb5_enctype enctype)
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{
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int ret = 0;
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krb5_data salt;
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ret = krb5_principal2salt(context, host_princ, &salt);
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if (ret) {
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DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
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return ret;
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}
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ret = krb5_c_string_to_key(context, enctype, password, &salt, key);
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SAFE_FREE(salt.data);
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return ret;
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}
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#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
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/* Heimdal */
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int create_kerberos_key_from_string_direct(krb5_context context,
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krb5_principal host_princ,
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krb5_data *password,
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krb5_keyblock *key,
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krb5_enctype enctype)
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{
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int ret;
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krb5_salt salt;
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ret = krb5_get_pw_salt(context, host_princ, &salt);
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if (ret) {
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DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
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return ret;
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}
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ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
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krb5_free_salt(context, salt);
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return ret;
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}
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#else
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#error UNKNOWN_CREATE_KEY_FUNCTIONS
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#endif
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#if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
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krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
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krb5_enctype **enctypes)
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{
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return krb5_get_permitted_enctypes(context, enctypes);
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}
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#elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
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krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
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krb5_enctype **enctypes)
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{
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#ifdef HAVE_KRB5_PDU_NONE_DECL
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return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
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#else
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return krb5_get_default_in_tkt_etypes(context, enctypes);
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#endif
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}
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#else
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#error UNKNOWN_GET_ENCTYPES_FUNCTIONS
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#endif
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#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
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krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
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krb5_auth_context auth_context,
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krb5_keyblock *keyblock)
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{
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return krb5_auth_con_setkey(context, auth_context, keyblock);
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}
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#endif
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bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
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DATA_BLOB *edata,
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DATA_BLOB *edata_out)
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{
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DATA_BLOB edata_contents;
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ASN1_DATA *data;
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int edata_type;
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if (!edata->length) {
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return false;
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}
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data = asn1_init(mem_ctx);
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if (data == NULL) {
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return false;
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}
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asn1_load(data, *edata);
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asn1_start_tag(data, ASN1_SEQUENCE(0));
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asn1_start_tag(data, ASN1_CONTEXT(1));
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asn1_read_Integer(data, &edata_type);
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if (edata_type != KRB5_PADATA_PW_SALT) {
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DEBUG(0,("edata is not of required type %d but of type %d\n",
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KRB5_PADATA_PW_SALT, edata_type));
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asn1_free(data);
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return false;
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}
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asn1_start_tag(data, ASN1_CONTEXT(2));
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asn1_read_OctetString(data, talloc_tos(), &edata_contents);
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asn1_end_tag(data);
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asn1_end_tag(data);
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asn1_end_tag(data);
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asn1_free(data);
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*edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
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data_blob_free(&edata_contents);
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return true;
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}
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static bool ads_cleanup_expired_creds(krb5_context context,
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krb5_ccache ccache,
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krb5_creds *credsp)
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{
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krb5_error_code retval;
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const char *cc_type = krb5_cc_get_type(context, ccache);
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DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
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cc_type, krb5_cc_get_name(context, ccache),
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http_timestring(talloc_tos(), credsp->times.endtime)));
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/* we will probably need new tickets if the current ones
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will expire within 10 seconds.
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*/
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if (credsp->times.endtime >= (time(NULL) + 10))
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return false;
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/* heimdal won't remove creds from a file ccache, and
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perhaps we shouldn't anyway, since internally we
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use memory ccaches, and a FILE one probably means that
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we're using creds obtained outside of our exectuable
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*/
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if (strequal(cc_type, "FILE")) {
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DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
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return false;
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}
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retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
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if (retval) {
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DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
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error_message(retval)));
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/* If we have an error in this, we want to display it,
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but continue as though we deleted it */
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}
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return true;
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}
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/* Allocate and setup the auth context into the state we need. */
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static krb5_error_code setup_auth_context(krb5_context context,
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krb5_auth_context *auth_context)
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{
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krb5_error_code retval;
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retval = krb5_auth_con_init(context, auth_context );
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if (retval) {
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DEBUG(1,("krb5_auth_con_init failed (%s)\n",
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error_message(retval)));
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return retval;
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}
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/* Ensure this is an addressless ticket. */
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retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
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if (retval) {
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DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
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error_message(retval)));
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}
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return retval;
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}
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#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)
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static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
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uint32_t gss_flags)
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{
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unsigned int orig_length = in_data->length;
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unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
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char *gss_cksum = NULL;
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if (orig_length) {
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/* Extra length field for delgated ticket. */
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base_cksum_size += 4;
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}
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if ((unsigned int)base_cksum_size + orig_length <
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(unsigned int)base_cksum_size) {
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return EINVAL;
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}
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gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
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if (gss_cksum == NULL) {
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return ENOMEM;
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}
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memset(gss_cksum, '\0', base_cksum_size + orig_length);
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SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
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/*
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* GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
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* This matches the behavior of heimdal and mit.
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*
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* And it is needed to work against some closed source
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* SMB servers.
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*
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* See bug #7883
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*/
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memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
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SIVAL(gss_cksum, 20, gss_flags);
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if (orig_length) {
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SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
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SSVAL(gss_cksum, 26, orig_length);
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/* Copy the kerberos KRB_CRED data */
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memcpy(gss_cksum + 28, in_data->data, orig_length);
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free(in_data->data);
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in_data->data = NULL;
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in_data->length = 0;
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}
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in_data->data = gss_cksum;
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in_data->length = base_cksum_size + orig_length;
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return 0;
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}
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#endif
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/**************************************************************
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krb5_parse_name that takes a UNIX charset.
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**************************************************************/
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krb5_error_code smb_krb5_parse_name(krb5_context context,
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const char *name, /* in unix charset */
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krb5_principal *principal)
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{
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krb5_error_code ret;
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char *utf8_name;
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size_t converted_size;
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TALLOC_CTX *frame = talloc_stackframe();
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if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
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talloc_free(frame);
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return ENOMEM;
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}
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ret = krb5_parse_name(context, utf8_name, principal);
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TALLOC_FREE(frame);
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return ret;
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}
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#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
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void krb5_free_unparsed_name(krb5_context context, char *val)
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{
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SAFE_FREE(val);
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}
|
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#endif
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/**************************************************************
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krb5_parse_name that returns a UNIX charset name. Must
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be freed with talloc_free() call.
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**************************************************************/
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krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
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krb5_context context,
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krb5_const_principal principal,
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char **unix_name)
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{
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krb5_error_code ret;
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char *utf8_name;
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size_t converted_size;
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*unix_name = NULL;
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ret = krb5_unparse_name(context, principal, &utf8_name);
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if (ret) {
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return ret;
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}
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if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
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krb5_free_unparsed_name(context, utf8_name);
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return ENOMEM;
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}
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krb5_free_unparsed_name(context, utf8_name);
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return 0;
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}
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|
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krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
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|
const char *name,
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krb5_principal *principal)
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{
|
|
/* we are cheating here because parse_name will in fact set the realm.
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* We don't care as the only caller of smb_krb5_parse_name_norealm
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* ignores the realm anyway when calling
|
|
* smb_krb5_principal_compare_any_realm later - Guenther */
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return smb_krb5_parse_name(context, name, principal);
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}
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bool smb_krb5_principal_compare_any_realm(krb5_context context,
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krb5_const_principal princ1,
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krb5_const_principal princ2)
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{
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return krb5_principal_compare_any_realm(context, princ1, princ2);
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}
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|
|
/*
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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,
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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;
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|
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[] = {
|
|
#ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
|
|
ENCTYPE_AES256_CTS_HMAC_SHA1_96,
|
|
#endif
|
|
#ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
|
|
ENCTYPE_AES128_CTS_HMAC_SHA1_96,
|
|
#endif
|
|
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;
|
|
|
|
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);
|
|
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
|
|
|
|
#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 */
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
if (out_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;
|
|
}
|
|
|
|
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;
|
|
mode_t mask;
|
|
|
|
memset(&entry, 0, sizeof(entry));
|
|
entry.principal = principal;
|
|
*(KRB5_KT_KEY(&entry)) = *keyblock;
|
|
|
|
memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
|
|
mask = umask(S_IRWXO | S_IRWXG);
|
|
mktemp(tmp_name);
|
|
umask(mask);
|
|
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_cc_cursor cursor;
|
|
krb5_error_code kerr;
|
|
krb5_creds cred;
|
|
krb5_timestamp now;
|
|
|
|
*t = 0;
|
|
|
|
kerr = krb5_timeofday(context, &now);
|
|
if (kerr) {
|
|
return kerr;
|
|
}
|
|
|
|
kerr = krb5_cc_start_seq_get(context, id, &cursor);
|
|
if (kerr) {
|
|
return kerr;
|
|
}
|
|
|
|
while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
|
|
#ifndef HAVE_FLAGS_IN_KRB5_CREDS
|
|
if (cred.ticket_flags & TKT_FLG_INITIAL) {
|
|
#else
|
|
if (cred.flags.b.initial) {
|
|
#endif
|
|
if (now < cred.times.endtime) {
|
|
*t = (time_t) (cred.times.endtime - now);
|
|
}
|
|
krb5_free_cred_contents(context, &cred);
|
|
break;
|
|
}
|
|
krb5_free_cred_contents(context, &cred);
|
|
}
|
|
|
|
krb5_cc_end_seq_get(context, id, &cursor);
|
|
|
|
return kerr;
|
|
}
|
|
#endif /* HAVE_KRB5_CC_GET_LIFETIME */
|
|
|
|
#if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
|
|
void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
|
|
{
|
|
free_Checksum(cksum);
|
|
}
|
|
#endif
|
|
|
|
krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
|
|
DATA_BLOB *pac_data,
|
|
krb5_context context,
|
|
const krb5_keyblock *keyblock,
|
|
uint32_t *sig_type,
|
|
DATA_BLOB *sig_blob)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_checksum cksum;
|
|
#if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
|
|
krb5_crypto crypto;
|
|
|
|
|
|
ret = krb5_crypto_init(context,
|
|
keyblock,
|
|
0,
|
|
&crypto);
|
|
if (ret) {
|
|
DEBUG(0,("krb5_crypto_init() failed: %s\n",
|
|
smb_get_krb5_error_message(context, ret, mem_ctx)));
|
|
return ret;
|
|
}
|
|
ret = krb5_create_checksum(context,
|
|
crypto,
|
|
KRB5_KU_OTHER_CKSUM,
|
|
0,
|
|
pac_data->data,
|
|
pac_data->length,
|
|
&cksum);
|
|
if (ret) {
|
|
DEBUG(2, ("PAC Verification failed: %s\n",
|
|
smb_get_krb5_error_message(context, ret, mem_ctx)));
|
|
}
|
|
|
|
krb5_crypto_destroy(context, crypto);
|
|
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
*sig_type = cksum.cksumtype;
|
|
*sig_blob = data_blob_talloc(mem_ctx,
|
|
cksum.checksum.data,
|
|
cksum.checksum.length);
|
|
#elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
|
|
krb5_data input;
|
|
|
|
input.data = (char *)pac_data->data;
|
|
input.length = pac_data->length;
|
|
|
|
ret = krb5_c_make_checksum(context,
|
|
0,
|
|
keyblock,
|
|
KRB5_KEYUSAGE_APP_DATA_CKSUM,
|
|
&input,
|
|
&cksum);
|
|
if (ret) {
|
|
DEBUG(2, ("PAC Verification failed: %s\n",
|
|
smb_get_krb5_error_message(context, ret, mem_ctx)));
|
|
return ret;
|
|
}
|
|
|
|
*sig_type = cksum.checksum_type;
|
|
*sig_blob = data_blob_talloc(mem_ctx,
|
|
cksum.contents,
|
|
cksum.length);
|
|
|
|
#else
|
|
#error krb5_create_checksum or krb5_c_make_checksum not available
|
|
#endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
|
|
smb_krb5_free_checksum_contents(context, &cksum);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 */
|