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5c2a2135c9
Also remove the unused configure tests for krb5_c_enctype_compare. Found by callcatcher: http://www.skynet.ie/~caolan/Packages/callcatcher.html Andrew Bartlett
1751 lines
44 KiB
C
1751 lines
44 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 "smb_krb5.h"
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#include "../librpc/gen_ndr/krb5pac.h"
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#include "../lib/util/asn1.h"
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#include "libsmb/nmblib.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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/* 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(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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int create_kerberos_key_from_string(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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bool no_salt)
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{
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krb5_principal salt_princ = NULL;
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int ret;
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/*
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* Check if we've determined that the KDC is salting keys for this
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* principal/enctype in a non-obvious way. If it is, try to match
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* its behavior.
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*/
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if (no_salt) {
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KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
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if (!KRB5_KEY_DATA(key)) {
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return ENOMEM;
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}
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memcpy(KRB5_KEY_DATA(key), password->data, password->length);
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KRB5_KEY_LENGTH(key) = password->length;
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KRB5_KEY_TYPE(key) = enctype;
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return 0;
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}
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salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
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ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
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if (salt_princ) {
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krb5_free_principal(context, salt_princ);
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}
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return ret;
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}
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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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bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
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{
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DATA_BLOB pac_contents;
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ASN1_DATA *data;
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int data_type;
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if (!auth_data->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, *auth_data);
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asn1_start_tag(data, ASN1_SEQUENCE(0));
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asn1_start_tag(data, ASN1_SEQUENCE(0));
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asn1_start_tag(data, ASN1_CONTEXT(0));
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asn1_read_Integer(data, &data_type);
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if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
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DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
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asn1_free(data);
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return False;
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}
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asn1_end_tag(data);
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asn1_start_tag(data, ASN1_CONTEXT(1));
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asn1_read_OctetString(data, talloc_tos(), &pac_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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*unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
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data_blob_free(&pac_contents);
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return True;
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}
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bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
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{
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DATA_BLOB auth_data_wrapped;
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bool got_auth_data_pac = False;
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int i;
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#if defined(HAVE_KRB5_TKT_ENC_PART2)
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if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
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tkt->enc_part2->authorization_data[0] &&
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tkt->enc_part2->authorization_data[0]->length)
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{
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for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
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if (tkt->enc_part2->authorization_data[i]->ad_type !=
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KRB5_AUTHDATA_IF_RELEVANT) {
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DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
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tkt->enc_part2->authorization_data[i]->ad_type));
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continue;
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}
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auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
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tkt->enc_part2->authorization_data[i]->length);
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/* check if it is a PAC */
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got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
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data_blob_free(&auth_data_wrapped);
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if (got_auth_data_pac) {
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return true;
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}
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}
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return got_auth_data_pac;
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}
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#else
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if (tkt->ticket.authorization_data &&
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tkt->ticket.authorization_data->len)
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{
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for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
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if (tkt->ticket.authorization_data->val[i].ad_type !=
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KRB5_AUTHDATA_IF_RELEVANT) {
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DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
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tkt->ticket.authorization_data->val[i].ad_type));
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continue;
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}
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auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
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tkt->ticket.authorization_data->val[i].ad_data.length);
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/* check if it is a PAC */
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got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
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data_blob_free(&auth_data_wrapped);
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if (got_auth_data_pac) {
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return true;
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}
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}
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return got_auth_data_pac;
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}
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#endif
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return False;
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}
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krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
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{
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#if defined(HAVE_KRB5_TKT_ENC_PART2)
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return tkt->enc_part2->client;
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#else
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return tkt->client;
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#endif
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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;
|
|
in_data->length = 0;
|
|
}
|
|
in_data->data = gss_cksum;
|
|
in_data->length = base_cksum_size + orig_length;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
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;
|
|
}
|
|
|
|
/*
|
|
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
|
|
|
|
time_t get_authtime_from_tkt(krb5_ticket *tkt)
|
|
{
|
|
#if defined(HAVE_KRB5_TKT_ENC_PART2)
|
|
return tkt->enc_part2->times.authtime;
|
|
#else
|
|
return tkt->ticket.authtime;
|
|
#endif
|
|
}
|
|
|
|
#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
|
|
static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
|
|
{
|
|
#ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
|
|
if (ap_req->ticket->enc_part.kvno)
|
|
return ap_req->ticket->enc_part.kvno;
|
|
#else /* Heimdal */
|
|
if (ap_req->ticket.enc_part.kvno)
|
|
return *ap_req->ticket.enc_part.kvno;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
|
|
{
|
|
#ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
|
|
return ap_req->ticket.enc_part.etype;
|
|
#else /* MIT */
|
|
return ap_req->ticket->enc_part.enctype;
|
|
#endif
|
|
}
|
|
#endif /* HAVE_KRB5_DECODE_AP_REQ */
|
|
|
|
static krb5_error_code
|
|
get_key_from_keytab(krb5_context context,
|
|
krb5_const_principal server,
|
|
krb5_enctype enctype,
|
|
krb5_kvno kvno,
|
|
krb5_keyblock **out_key)
|
|
{
|
|
krb5_keytab_entry entry;
|
|
krb5_error_code ret;
|
|
krb5_keytab keytab;
|
|
char *name = NULL;
|
|
krb5_keyblock *keyp;
|
|
|
|
/* We have to open a new keytab handle here, as MIT does
|
|
an implicit open/getnext/close on krb5_kt_get_entry. We
|
|
may be in the middle of a keytab enumeration when this is
|
|
called. JRA. */
|
|
|
|
ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
|
|
if (ret) {
|
|
DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
|
|
return ret;
|
|
}
|
|
|
|
if ( DEBUGLEVEL >= 10 ) {
|
|
if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
|
|
DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
|
|
kvno, enctype, name));
|
|
TALLOC_FREE(name);
|
|
}
|
|
}
|
|
|
|
ret = krb5_kt_get_entry(context,
|
|
keytab,
|
|
server,
|
|
kvno,
|
|
enctype,
|
|
&entry);
|
|
|
|
if (ret) {
|
|
DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
|
|
goto out;
|
|
}
|
|
|
|
keyp = KRB5_KT_KEY(&entry);
|
|
|
|
ret = krb5_copy_keyblock(context, keyp, out_key);
|
|
if (ret) {
|
|
DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
|
|
goto out;
|
|
}
|
|
|
|
smb_krb5_kt_free_entry(context, &entry);
|
|
|
|
out:
|
|
krb5_kt_close(context, keytab);
|
|
return ret;
|
|
}
|
|
|
|
/* Prototypes */
|
|
|
|
krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
|
|
const krb5_data *inbuf,
|
|
krb5_kvno *kvno,
|
|
krb5_enctype *enctype)
|
|
{
|
|
#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_ap_req ap_req;
|
|
|
|
ret = krb5_decode_ap_req(context, inbuf, &ap_req);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*kvno = get_kvno_from_ap_req(&ap_req);
|
|
*enctype = get_enctype_from_ap_req(&ap_req);
|
|
|
|
free_AP_REQ(&ap_req);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Possibly not an appropriate error code. */
|
|
return KRB5KDC_ERR_BADOPTION;
|
|
}
|
|
|
|
krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
|
|
krb5_auth_context *auth_context,
|
|
const krb5_data *inbuf,
|
|
krb5_const_principal server,
|
|
krb5_keytab keytab,
|
|
krb5_flags *ap_req_options,
|
|
krb5_ticket **ticket,
|
|
krb5_keyblock **keyblock)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_kvno kvno;
|
|
krb5_enctype enctype;
|
|
krb5_keyblock *local_keyblock;
|
|
|
|
ret = krb5_rd_req(context,
|
|
auth_context,
|
|
inbuf,
|
|
server,
|
|
keytab,
|
|
ap_req_options,
|
|
ticket);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
#ifdef KRB5_TICKET_HAS_KEYINFO
|
|
enctype = (*ticket)->enc_part.enctype;
|
|
kvno = (*ticket)->enc_part.kvno;
|
|
#else
|
|
ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
ret = get_key_from_keytab(context,
|
|
server,
|
|
enctype,
|
|
kvno,
|
|
&local_keyblock);
|
|
if (ret) {
|
|
DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (ret && local_keyblock != NULL) {
|
|
krb5_free_keyblock(context, local_keyblock);
|
|
} else {
|
|
*keyblock = local_keyblock;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
krb5_error_code smb_krb5_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;
|
|
}
|
|
|
|
krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
|
|
{
|
|
krb5_error_code ret = 0;
|
|
nstring buf;
|
|
#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
|
|
krb5_address **addrs = NULL;
|
|
#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
|
|
krb5_addresses *addrs = NULL;
|
|
#endif
|
|
|
|
*kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
|
|
if (*kerb_addr == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
put_name(buf, lp_netbios_name(), ' ', 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));
|
|
}
|
|
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
}
|
|
|
|
#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;
|
|
}
|
|
|
|
bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
|
|
{
|
|
DEBUG(0,("NO KERBEROS SUPPORT\n"));
|
|
return false;
|
|
}
|
|
|
|
#endif /* HAVE_KRB5 */
|