777 lines
19 KiB
C
777 lines
19 KiB
C
/*
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* Copyright (c) 1997, 1998, 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <krb5_locl.h>
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RCSID("$Id: get_cred.c,v 1.75 1999/12/02 17:05:09 joda Exp $");
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/*
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* Take the `body' and encode it into `padata' using the credentials
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* in `creds'.
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*/
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static krb5_error_code
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make_pa_tgs_req(krb5_context context,
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krb5_auth_context ac,
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KDC_REQ_BODY *body,
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PA_DATA *padata,
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krb5_creds *creds)
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{
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u_char *buf;
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size_t buf_size;
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size_t len;
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krb5_data in_data;
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krb5_error_code ret;
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buf_size = 1024;
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buf = malloc (buf_size);
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if (buf == NULL)
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return ENOMEM;
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do {
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ret = encode_KDC_REQ_BODY(buf + buf_size - 1, buf_size,
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body, &len);
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if (ret){
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if (ret == ASN1_OVERFLOW) {
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u_char *tmp;
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buf_size *= 2;
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tmp = realloc (buf, buf_size);
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if (tmp == NULL) {
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ret = ENOMEM;
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goto out;
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}
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buf = tmp;
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} else {
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goto out;
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}
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}
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} while (ret == ASN1_OVERFLOW);
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in_data.length = len;
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in_data.data = buf + buf_size - len;
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ret = krb5_mk_req_internal(context, &ac, 0, &in_data, creds,
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&padata->padata_value,
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KRB5_KU_TGS_REQ_AUTH_CKSUM);
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out:
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free (buf);
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if(ret)
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return ret;
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padata->padata_type = pa_tgs_req;
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return 0;
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}
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/*
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* Set the `enc-authorization-data' in `req_body' based on `authdata'
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*/
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static krb5_error_code
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set_auth_data (krb5_context context,
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KDC_REQ_BODY *req_body,
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krb5_authdata *authdata,
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krb5_keyblock *key)
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{
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if(authdata->len) {
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size_t len;
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unsigned char *buf;
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krb5_crypto crypto;
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krb5_error_code ret;
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len = length_AuthorizationData(authdata);
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buf = malloc(len);
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if (buf == NULL)
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return ENOMEM;
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ret = encode_AuthorizationData(buf + len - 1,
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len, authdata, &len);
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if (ret) {
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free (buf);
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return ret;
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}
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ALLOC(req_body->enc_authorization_data, 1);
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if (req_body->enc_authorization_data == NULL) {
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free (buf);
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return ret;
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}
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ret = krb5_crypto_init(context, key, 0, &crypto);
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if (ret) {
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free (buf);
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free (req_body->enc_authorization_data);
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return ret;
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}
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krb5_encrypt_EncryptedData(context,
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crypto,
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KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY,
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/* KRB5_KU_TGS_REQ_AUTH_DAT_SESSION? */
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buf,
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len,
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0,
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req_body->enc_authorization_data);
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free (buf);
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krb5_crypto_destroy(context, crypto);
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} else {
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req_body->enc_authorization_data = NULL;
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}
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return 0;
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}
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/*
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* Create a tgs-req in `t' with `addresses', `flags', `second_ticket'
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* (if not-NULL), `in_creds', `krbtgt', and returning the generated
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* subkey in `subkey'.
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*/
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static krb5_error_code
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init_tgs_req (krb5_context context,
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krb5_ccache ccache,
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krb5_addresses *addresses,
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krb5_kdc_flags flags,
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Ticket *second_ticket,
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krb5_creds *in_creds,
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krb5_creds *krbtgt,
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unsigned nonce,
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krb5_keyblock **subkey,
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TGS_REQ *t)
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{
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krb5_error_code ret;
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memset(t, 0, sizeof(*t));
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t->pvno = 5;
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t->msg_type = krb_tgs_req;
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if (in_creds->session.keytype) {
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ret = krb5_keytype_to_enctypes_default (context,
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in_creds->session.keytype,
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&t->req_body.etype.len,
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&t->req_body.etype.val);
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} else {
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ret = krb5_init_etype(context,
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&t->req_body.etype.len,
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&t->req_body.etype.val,
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NULL);
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}
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if (ret)
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goto fail;
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t->req_body.addresses = addresses;
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t->req_body.kdc_options = flags.b;
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ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
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if (ret)
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goto fail;
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ALLOC(t->req_body.sname, 1);
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if (t->req_body.sname == NULL) {
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ret = ENOMEM;
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goto fail;
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}
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ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
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if (ret)
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goto fail;
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/* req_body.till should be NULL if there is no endtime specified,
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but old MIT code (like DCE secd) doesn't like that */
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ALLOC(t->req_body.till, 1);
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if(t->req_body.till == NULL){
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ret = ENOMEM;
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goto fail;
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}
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*t->req_body.till = in_creds->times.endtime;
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t->req_body.nonce = nonce;
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if(second_ticket){
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ALLOC(t->req_body.additional_tickets, 1);
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if (t->req_body.additional_tickets == NULL) {
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ret = ENOMEM;
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goto fail;
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}
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ALLOC_SEQ(t->req_body.additional_tickets, 1);
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if (t->req_body.additional_tickets->val == NULL) {
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ret = ENOMEM;
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goto fail;
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}
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ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
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if (ret)
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goto fail;
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}
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ALLOC(t->padata, 1);
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if (t->padata == NULL) {
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ret = ENOMEM;
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goto fail;
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}
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ALLOC_SEQ(t->padata, 1);
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if (t->padata->val == NULL) {
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ret = ENOMEM;
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goto fail;
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}
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{
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krb5_auth_context ac;
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krb5_keyblock *key;
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ret = krb5_auth_con_init(context, &ac);
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if(ret)
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goto fail;
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ret = krb5_generate_subkey (context, &krbtgt->session, &key);
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if (ret) {
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krb5_auth_con_free (context, ac);
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goto fail;
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}
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ret = krb5_auth_con_setlocalsubkey(context, ac, key);
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if (ret) {
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krb5_free_keyblock (context, key);
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krb5_auth_con_free (context, ac);
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goto fail;
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}
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ret = set_auth_data (context, &t->req_body, &in_creds->authdata, key);
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if (ret) {
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krb5_free_keyblock (context, key);
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krb5_auth_con_free (context, ac);
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goto fail;
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}
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ret = make_pa_tgs_req(context,
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ac,
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&t->req_body,
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t->padata->val,
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krbtgt);
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if(ret) {
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krb5_free_keyblock (context, key);
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krb5_auth_con_free(context, ac);
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goto fail;
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}
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*subkey = key;
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krb5_auth_con_free(context, ac);
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}
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fail:
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if (ret)
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free_TGS_REQ (t);
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return ret;
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}
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static krb5_error_code
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get_krbtgt(krb5_context context,
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krb5_ccache id,
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krb5_realm realm,
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krb5_creds **cred)
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{
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krb5_error_code ret;
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krb5_creds tmp_cred;
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memset(&tmp_cred, 0, sizeof(tmp_cred));
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ret = krb5_make_principal(context,
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&tmp_cred.server,
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realm,
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KRB5_TGS_NAME,
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realm,
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NULL);
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if(ret)
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return ret;
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ret = krb5_get_credentials(context,
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KRB5_GC_CACHED,
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id,
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&tmp_cred,
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cred);
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krb5_free_principal(context, tmp_cred.server);
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if(ret)
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return ret;
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return 0;
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}
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/* DCE compatible decrypt proc */
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static krb5_error_code
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decrypt_tkt_with_subkey (krb5_context context,
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krb5_keyblock *key,
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krb5_key_usage usage,
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krb5_const_pointer subkey,
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krb5_kdc_rep *dec_rep)
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{
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krb5_error_code ret;
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krb5_data data;
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size_t size;
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krb5_crypto crypto;
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krb5_crypto_init(context, key, 0, &crypto);
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ret = krb5_decrypt_EncryptedData (context,
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crypto,
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usage,
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&dec_rep->kdc_rep.enc_part,
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&data);
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krb5_crypto_destroy(context, crypto);
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if(ret && subkey){
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/* DCE compat -- try to decrypt with subkey */
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krb5_crypto_init(context, (krb5_keyblock*)subkey, 0, &crypto);
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ret = krb5_decrypt_EncryptedData (context,
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crypto,
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KRB5_KU_TGS_REP_ENC_PART_SUB_KEY,
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&dec_rep->kdc_rep.enc_part,
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&data);
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krb5_crypto_destroy(context, crypto);
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}
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if (ret)
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return ret;
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ret = krb5_decode_EncASRepPart(context,
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data.data,
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data.length,
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&dec_rep->enc_part,
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&size);
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if (ret)
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ret = krb5_decode_EncTGSRepPart(context,
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data.data,
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data.length,
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&dec_rep->enc_part,
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&size);
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krb5_data_free (&data);
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return ret;
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}
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static krb5_error_code
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get_cred_kdc(krb5_context context,
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krb5_ccache id,
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krb5_kdc_flags flags,
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krb5_addresses *addresses,
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krb5_creds *in_creds,
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krb5_creds *krbtgt,
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krb5_creds *out_creds)
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{
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TGS_REQ req;
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krb5_data enc;
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krb5_data resp;
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krb5_kdc_rep rep;
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KRB_ERROR error;
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krb5_error_code ret;
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unsigned nonce;
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krb5_keyblock *subkey = NULL;
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u_char *buf = NULL;
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size_t buf_size;
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size_t len;
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Ticket second_ticket;
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krb5_generate_random_block(&nonce, sizeof(nonce));
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nonce &= 0xffffffff;
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if(flags.b.enc_tkt_in_skey){
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ret = decode_Ticket(in_creds->second_ticket.data,
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in_creds->second_ticket.length,
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&second_ticket, &len);
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if(ret)
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return ret;
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}
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ret = init_tgs_req (context,
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id,
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addresses,
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flags,
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flags.b.enc_tkt_in_skey ? &second_ticket : NULL,
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in_creds,
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krbtgt,
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nonce,
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&subkey,
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&req);
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if(flags.b.enc_tkt_in_skey)
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free_Ticket(&second_ticket);
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if (ret)
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goto out;
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buf_size = 1024;
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buf = malloc (buf_size);
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if (buf == NULL) {
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ret = ENOMEM;
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goto out;
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}
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do {
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ret = encode_TGS_REQ (buf + buf_size - 1, buf_size,
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&req, &enc.length);
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if (ret) {
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if (ret == ASN1_OVERFLOW) {
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u_char *tmp;
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buf_size *= 2;
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tmp = realloc (buf, buf_size);
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if (tmp == NULL) {
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ret = ENOMEM;
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goto out;
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}
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buf = tmp;
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} else {
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goto out;
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}
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}
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} while (ret == ASN1_OVERFLOW);
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/* don't free addresses */
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req.req_body.addresses = NULL;
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free_TGS_REQ(&req);
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enc.data = buf + buf_size - enc.length;
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if (ret)
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goto out;
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/*
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* Send and receive
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*/
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ret = krb5_sendto_kdc (context, &enc,
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&krbtgt->server->name.name_string.val[1], &resp);
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if(ret)
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goto out;
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memset(&rep, 0, sizeof(rep));
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if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0){
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ret = krb5_copy_principal(context,
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in_creds->client,
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&out_creds->client);
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if(ret)
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goto out;
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ret = krb5_copy_principal(context,
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in_creds->server,
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&out_creds->server);
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if(ret)
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goto out;
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/* this should go someplace else */
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out_creds->times.endtime = in_creds->times.endtime;
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ret = _krb5_extract_ticket(context,
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&rep,
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out_creds,
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&krbtgt->session,
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NULL,
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KRB5_KU_TGS_REP_ENC_PART_SESSION,
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&krbtgt->addresses,
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nonce,
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TRUE,
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decrypt_tkt_with_subkey,
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subkey);
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krb5_free_kdc_rep(context, &rep);
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if (ret)
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goto out;
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}else if(krb5_rd_error(context, &resp, &error) == 0){
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ret = error.error_code;
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free_KRB_ERROR(&error);
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}else if(resp.data && ((char*)resp.data)[0] == 4)
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ret = KRB5KRB_AP_ERR_V4_REPLY;
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else
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ret = KRB5KRB_AP_ERR_MSG_TYPE;
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krb5_data_free(&resp);
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out:
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if(subkey){
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krb5_free_keyblock_contents(context, subkey);
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free(subkey);
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}
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if (buf)
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free (buf);
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return ret;
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}
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/* same as above, just get local addresses first */
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static krb5_error_code
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get_cred_kdc_la(krb5_context context, krb5_ccache id, krb5_kdc_flags flags,
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krb5_creds *in_creds, krb5_creds *krbtgt,
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krb5_creds *out_creds)
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{
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krb5_error_code ret;
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krb5_addresses addresses;
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|
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krb5_get_all_client_addrs(context, &addresses);
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ret = get_cred_kdc(context, id, flags, &addresses,
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in_creds, krbtgt, out_creds);
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krb5_free_addresses(context, &addresses);
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return ret;
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}
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krb5_error_code
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krb5_get_kdc_cred(krb5_context context,
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krb5_ccache id,
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krb5_kdc_flags flags,
|
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krb5_addresses *addresses,
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Ticket *second_ticket,
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krb5_creds *in_creds,
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|
krb5_creds **out_creds
|
|
)
|
|
{
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krb5_error_code ret;
|
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krb5_creds *krbtgt;
|
|
*out_creds = calloc(1, sizeof(**out_creds));
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|
if(*out_creds == NULL)
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|
return ENOMEM;
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|
ret = get_krbtgt (context,
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|
id,
|
|
in_creds->server->realm,
|
|
&krbtgt);
|
|
if(ret) {
|
|
free(*out_creds);
|
|
return ret;
|
|
}
|
|
ret = get_cred_kdc(context, id, flags, addresses,
|
|
in_creds, krbtgt, *out_creds);
|
|
krb5_free_creds (context, krbtgt);
|
|
if(ret)
|
|
free(*out_creds);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static krb5_error_code
|
|
find_cred(krb5_context context,
|
|
krb5_ccache id,
|
|
krb5_principal server,
|
|
krb5_creds **tgts,
|
|
krb5_creds *out_creds)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_creds mcreds;
|
|
mcreds.server = server;
|
|
ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_DONT_MATCH_REALM,
|
|
&mcreds, out_creds);
|
|
if(ret == 0)
|
|
return 0;
|
|
while(tgts && *tgts){
|
|
if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM,
|
|
&mcreds, *tgts)){
|
|
ret = krb5_copy_creds_contents(context, *tgts, out_creds);
|
|
return ret;
|
|
}
|
|
tgts++;
|
|
}
|
|
return KRB5_CC_NOTFOUND;
|
|
}
|
|
|
|
static krb5_error_code
|
|
add_cred(krb5_context context, krb5_creds ***tgts, krb5_creds *tkt)
|
|
{
|
|
int i;
|
|
krb5_error_code ret;
|
|
krb5_creds **tmp = *tgts;
|
|
for(i = 0; tmp && tmp[i]; i++); /* XXX */
|
|
tmp = realloc(tmp, (i+2)*sizeof(*tmp));
|
|
if(tmp == NULL)
|
|
return ENOMEM;
|
|
*tgts = tmp;
|
|
ret = krb5_copy_creds(context, tkt, &tmp[i]);
|
|
tmp[i+1] = NULL;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
get_cred(server)
|
|
creds = cc_get_cred(server)
|
|
if(creds) return creds
|
|
tgt = cc_get_cred(krbtgt/server_realm@any_realm)
|
|
if(tgt)
|
|
return get_cred_tgt(server, tgt)
|
|
if(client_realm == server_realm)
|
|
return NULL
|
|
tgt = get_cred(krbtgt/server_realm@client_realm)
|
|
while(tgt_inst != server_realm)
|
|
tgt = get_cred(krbtgt/server_realm@tgt_inst)
|
|
return get_cred_tgt(server, tgt)
|
|
*/
|
|
|
|
static krb5_error_code
|
|
get_cred_from_kdc_flags(krb5_context context,
|
|
krb5_kdc_flags flags,
|
|
krb5_ccache ccache,
|
|
krb5_creds *in_creds,
|
|
krb5_creds **out_creds,
|
|
krb5_creds ***ret_tgts)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_creds *tgt, tmp_creds;
|
|
krb5_realm client_realm, server_realm;
|
|
|
|
*out_creds = NULL;
|
|
|
|
client_realm = *krb5_princ_realm(context, in_creds->client);
|
|
server_realm = *krb5_princ_realm(context, in_creds->server);
|
|
memset(&tmp_creds, 0, sizeof(tmp_creds));
|
|
ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
|
|
if(ret)
|
|
return ret;
|
|
ret = krb5_make_principal(context,
|
|
&tmp_creds.server,
|
|
client_realm,
|
|
KRB5_TGS_NAME,
|
|
server_realm,
|
|
NULL);
|
|
if(ret){
|
|
krb5_free_principal(context, tmp_creds.client);
|
|
return ret;
|
|
}
|
|
{
|
|
krb5_creds tgts;
|
|
/* XXX try krb5_cc_retrieve_cred first? */
|
|
ret = find_cred(context, ccache, tmp_creds.server,
|
|
*ret_tgts, &tgts);
|
|
if(ret == 0){
|
|
*out_creds = calloc(1, sizeof(**out_creds));
|
|
if(*out_creds == NULL)
|
|
ret = ENOMEM;
|
|
else {
|
|
ret = get_cred_kdc_la(context, ccache, flags,
|
|
in_creds, &tgts, *out_creds);
|
|
if (ret)
|
|
free (*out_creds);
|
|
}
|
|
krb5_free_creds_contents(context, &tgts);
|
|
krb5_free_principal(context, tmp_creds.server);
|
|
krb5_free_principal(context, tmp_creds.client);
|
|
return ret;
|
|
}
|
|
}
|
|
if(krb5_realm_compare(context, in_creds->client, in_creds->server))
|
|
return KRB5_CC_NOTFOUND;
|
|
/* XXX this can loop forever */
|
|
while(1){
|
|
general_string tgt_inst;
|
|
krb5_kdc_flags f;
|
|
f.i = 0;
|
|
ret = get_cred_from_kdc_flags(context, flags, ccache, &tmp_creds,
|
|
&tgt, ret_tgts);
|
|
if(ret) {
|
|
krb5_free_principal(context, tmp_creds.server);
|
|
krb5_free_principal(context, tmp_creds.client);
|
|
return ret;
|
|
}
|
|
ret = add_cred(context, ret_tgts, tgt);
|
|
if(ret) {
|
|
krb5_free_principal(context, tmp_creds.server);
|
|
krb5_free_principal(context, tmp_creds.client);
|
|
return ret;
|
|
}
|
|
tgt_inst = tgt->server->name.name_string.val[1];
|
|
if(strcmp(tgt_inst, server_realm) == 0)
|
|
break;
|
|
krb5_free_principal(context, tmp_creds.server);
|
|
ret = krb5_make_principal(context, &tmp_creds.server,
|
|
tgt_inst, KRB5_TGS_NAME, server_realm, NULL);
|
|
if(ret) {
|
|
krb5_free_principal(context, tmp_creds.server);
|
|
krb5_free_principal(context, tmp_creds.client);
|
|
return ret;
|
|
}
|
|
ret = krb5_free_creds(context, tgt);
|
|
if(ret) {
|
|
krb5_free_principal(context, tmp_creds.server);
|
|
krb5_free_principal(context, tmp_creds.client);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
krb5_free_principal(context, tmp_creds.server);
|
|
krb5_free_principal(context, tmp_creds.client);
|
|
*out_creds = calloc(1, sizeof(**out_creds));
|
|
if(*out_creds == NULL)
|
|
ret = ENOMEM;
|
|
else {
|
|
ret = get_cred_kdc_la(context, ccache, flags,
|
|
in_creds, tgt, *out_creds);
|
|
if (ret)
|
|
free (*out_creds);
|
|
}
|
|
krb5_free_creds(context, tgt);
|
|
return ret;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_get_cred_from_kdc(krb5_context context,
|
|
krb5_ccache ccache,
|
|
krb5_creds *in_creds,
|
|
krb5_creds **out_creds,
|
|
krb5_creds ***ret_tgts)
|
|
{
|
|
krb5_kdc_flags f;
|
|
f.i = 0;
|
|
return get_cred_from_kdc_flags(context, f, ccache,
|
|
in_creds, out_creds, ret_tgts);
|
|
}
|
|
|
|
|
|
krb5_error_code
|
|
krb5_get_credentials_with_flags(krb5_context context,
|
|
krb5_flags options,
|
|
krb5_kdc_flags flags,
|
|
krb5_ccache ccache,
|
|
krb5_creds *in_creds,
|
|
krb5_creds **out_creds)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_creds **tgts;
|
|
int i;
|
|
|
|
*out_creds = calloc(1, sizeof(**out_creds));
|
|
if (*out_creds == NULL)
|
|
return ENOMEM;
|
|
|
|
ret = krb5_cc_retrieve_cred(context,
|
|
ccache,
|
|
in_creds->session.keytype ?
|
|
KRB5_TC_MATCH_KEYTYPE : 0,
|
|
in_creds, *out_creds);
|
|
if(ret == 0)
|
|
return 0;
|
|
free(*out_creds);
|
|
if(ret != KRB5_CC_END)
|
|
return ret;
|
|
if(options & KRB5_GC_CACHED)
|
|
return KRB5_CC_NOTFOUND;
|
|
if(options & KRB5_GC_USER_USER)
|
|
flags.b.enc_tkt_in_skey = 1;
|
|
tgts = NULL;
|
|
ret = get_cred_from_kdc_flags(context, flags, ccache,
|
|
in_creds, out_creds, &tgts);
|
|
for(i = 0; tgts && tgts[i]; i++){
|
|
krb5_cc_store_cred(context, ccache, tgts[i]);
|
|
krb5_free_creds(context, tgts[i]);
|
|
}
|
|
free(tgts);
|
|
if(ret == 0 && flags.b.enc_tkt_in_skey == 0)
|
|
krb5_cc_store_cred(context, ccache, *out_creds);
|
|
return ret;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_get_credentials(krb5_context context,
|
|
krb5_flags options,
|
|
krb5_ccache ccache,
|
|
krb5_creds *in_creds,
|
|
krb5_creds **out_creds)
|
|
{
|
|
krb5_kdc_flags flags;
|
|
flags.i = 0;
|
|
return krb5_get_credentials_with_flags(context, options, flags,
|
|
ccache, in_creds, out_creds);
|
|
}
|