436 lines
9.2 KiB
C
436 lines
9.2 KiB
C
/*
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* Copyright (c) 2006 - 2007 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 "ntlm/ntlm.h"
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RCSID("$Id: digest.c 22169 2007-12-04 22:19:16Z lha $");
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/*
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*
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*/
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struct ntlmkrb5 {
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krb5_context context;
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krb5_ntlm ntlm;
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krb5_realm kerberos_realm;
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krb5_ccache id;
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krb5_data opaque;
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int destroy;
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OM_uint32 flags;
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struct ntlm_buf key;
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krb5_data sessionkey;
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};
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static OM_uint32 kdc_destroy(OM_uint32 *, void *);
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/*
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* Get credential cache that the ntlm code can use to talk to the KDC
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* using the digest API.
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*/
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static krb5_error_code
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get_ccache(krb5_context context, int *destroy, krb5_ccache *id)
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{
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krb5_principal principal = NULL;
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krb5_error_code ret;
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krb5_keytab kt = NULL;
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*id = NULL;
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if (!issuid()) {
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const char *cache;
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cache = getenv("NTLM_ACCEPTOR_CCACHE");
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if (cache) {
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ret = krb5_cc_resolve(context, cache, id);
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if (ret)
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goto out;
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return 0;
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}
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}
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ret = krb5_sname_to_principal(context, NULL, "host",
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KRB5_NT_SRV_HST, &principal);
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if (ret)
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goto out;
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ret = krb5_cc_cache_match(context, principal, NULL, id);
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if (ret == 0)
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return 0;
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/* did not find in default credcache, lets try default keytab */
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ret = krb5_kt_default(context, &kt);
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if (ret)
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goto out;
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/* XXX check in keytab */
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{
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krb5_get_init_creds_opt *opt;
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krb5_creds cred;
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memset(&cred, 0, sizeof(cred));
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ret = krb5_cc_new_unique(context, "MEMORY", NULL, id);
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if (ret)
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goto out;
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*destroy = 1;
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ret = krb5_get_init_creds_opt_alloc(context, &opt);
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if (ret)
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goto out;
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ret = krb5_get_init_creds_keytab (context,
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&cred,
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principal,
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kt,
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0,
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NULL,
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opt);
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krb5_get_init_creds_opt_free(context, opt);
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if (ret)
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goto out;
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ret = krb5_cc_initialize (context, *id, cred.client);
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if (ret) {
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krb5_free_cred_contents (context, &cred);
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goto out;
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}
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ret = krb5_cc_store_cred (context, *id, &cred);
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krb5_free_cred_contents (context, &cred);
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if (ret)
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goto out;
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}
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krb5_kt_close(context, kt);
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return 0;
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out:
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if (*destroy)
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krb5_cc_destroy(context, *id);
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else
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krb5_cc_close(context, *id);
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*id = NULL;
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if (kt)
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krb5_kt_close(context, kt);
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if (principal)
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krb5_free_principal(context, principal);
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return ret;
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}
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/*
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*
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*/
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static OM_uint32
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kdc_alloc(OM_uint32 *minor, void **ctx)
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{
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krb5_error_code ret;
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struct ntlmkrb5 *c;
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OM_uint32 junk;
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c = calloc(1, sizeof(*c));
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if (c == NULL) {
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*minor = ENOMEM;
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return GSS_S_FAILURE;
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}
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ret = krb5_init_context(&c->context);
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if (ret) {
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kdc_destroy(&junk, c);
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*minor = ret;
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return GSS_S_FAILURE;
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}
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ret = get_ccache(c->context, &c->destroy, &c->id);
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if (ret) {
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kdc_destroy(&junk, c);
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*minor = ret;
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return GSS_S_FAILURE;
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}
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ret = krb5_ntlm_alloc(c->context, &c->ntlm);
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if (ret) {
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kdc_destroy(&junk, c);
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*minor = ret;
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return GSS_S_FAILURE;
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}
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*ctx = c;
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return GSS_S_COMPLETE;
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}
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static int
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kdc_probe(OM_uint32 *minor, void *ctx, const char *realm)
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{
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struct ntlmkrb5 *c = ctx;
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krb5_error_code ret;
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unsigned flags;
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ret = krb5_digest_probe(c->context, rk_UNCONST(realm), c->id, &flags);
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if (ret)
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return ret;
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if ((flags & (1|2|4)) == 0)
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return EINVAL;
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return 0;
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}
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/*
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*
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*/
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static OM_uint32
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kdc_destroy(OM_uint32 *minor, void *ctx)
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{
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struct ntlmkrb5 *c = ctx;
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krb5_data_free(&c->opaque);
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krb5_data_free(&c->sessionkey);
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if (c->ntlm)
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krb5_ntlm_free(c->context, c->ntlm);
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if (c->id) {
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if (c->destroy)
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krb5_cc_destroy(c->context, c->id);
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else
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krb5_cc_close(c->context, c->id);
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}
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if (c->context)
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krb5_free_context(c->context);
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memset(c, 0, sizeof(*c));
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free(c);
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return GSS_S_COMPLETE;
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}
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/*
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*
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*/
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static OM_uint32
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kdc_type2(OM_uint32 *minor_status,
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void *ctx,
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uint32_t flags,
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const char *hostname,
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const char *domain,
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uint32_t *ret_flags,
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struct ntlm_buf *out)
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{
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struct ntlmkrb5 *c = ctx;
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krb5_error_code ret;
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struct ntlm_type2 type2;
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krb5_data challange;
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struct ntlm_buf data;
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krb5_data ti;
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memset(&type2, 0, sizeof(type2));
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/*
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* Request data for type 2 packet from the KDC.
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*/
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ret = krb5_ntlm_init_request(c->context,
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c->ntlm,
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NULL,
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c->id,
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flags,
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hostname,
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domain);
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if (ret) {
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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/*
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*
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*/
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ret = krb5_ntlm_init_get_opaque(c->context, c->ntlm, &c->opaque);
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if (ret) {
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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/*
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*
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*/
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ret = krb5_ntlm_init_get_flags(c->context, c->ntlm, &type2.flags);
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if (ret) {
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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*ret_flags = type2.flags;
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ret = krb5_ntlm_init_get_challange(c->context, c->ntlm, &challange);
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if (ret) {
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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if (challange.length != sizeof(type2.challange)) {
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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}
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memcpy(type2.challange, challange.data, sizeof(type2.challange));
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krb5_data_free(&challange);
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ret = krb5_ntlm_init_get_targetname(c->context, c->ntlm,
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&type2.targetname);
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if (ret) {
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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ret = krb5_ntlm_init_get_targetinfo(c->context, c->ntlm, &ti);
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if (ret) {
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free(type2.targetname);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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type2.targetinfo.data = ti.data;
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type2.targetinfo.length = ti.length;
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ret = heim_ntlm_encode_type2(&type2, &data);
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free(type2.targetname);
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krb5_data_free(&ti);
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if (ret) {
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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out->data = data.data;
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out->length = data.length;
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return GSS_S_COMPLETE;
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}
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/*
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*
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*/
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static OM_uint32
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kdc_type3(OM_uint32 *minor_status,
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void *ctx,
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const struct ntlm_type3 *type3,
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struct ntlm_buf *sessionkey)
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{
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struct ntlmkrb5 *c = ctx;
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krb5_error_code ret;
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sessionkey->data = NULL;
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sessionkey->length = 0;
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ret = krb5_ntlm_req_set_flags(c->context, c->ntlm, type3->flags);
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if (ret) goto out;
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ret = krb5_ntlm_req_set_username(c->context, c->ntlm, type3->username);
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if (ret) goto out;
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ret = krb5_ntlm_req_set_targetname(c->context, c->ntlm,
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type3->targetname);
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if (ret) goto out;
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ret = krb5_ntlm_req_set_lm(c->context, c->ntlm,
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type3->lm.data, type3->lm.length);
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if (ret) goto out;
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ret = krb5_ntlm_req_set_ntlm(c->context, c->ntlm,
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type3->ntlm.data, type3->ntlm.length);
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if (ret) goto out;
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ret = krb5_ntlm_req_set_opaque(c->context, c->ntlm, &c->opaque);
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if (ret) goto out;
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if (type3->sessionkey.length) {
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ret = krb5_ntlm_req_set_session(c->context, c->ntlm,
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type3->sessionkey.data,
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type3->sessionkey.length);
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if (ret) goto out;
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}
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/*
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* Verify with the KDC the type3 packet is ok
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*/
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ret = krb5_ntlm_request(c->context,
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c->ntlm,
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NULL,
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c->id);
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if (ret)
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goto out;
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if (krb5_ntlm_rep_get_status(c->context, c->ntlm) != TRUE) {
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ret = EINVAL;
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goto out;
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}
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if (type3->sessionkey.length) {
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ret = krb5_ntlm_rep_get_sessionkey(c->context,
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c->ntlm,
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&c->sessionkey);
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if (ret)
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goto out;
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sessionkey->data = c->sessionkey.data;
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sessionkey->length = c->sessionkey.length;
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}
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return 0;
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out:
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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/*
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*
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*/
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static void
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kdc_free_buffer(struct ntlm_buf *sessionkey)
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{
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if (sessionkey->data)
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free(sessionkey->data);
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sessionkey->data = NULL;
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sessionkey->length = 0;
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}
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/*
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*
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*/
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struct ntlm_server_interface ntlmsspi_kdc_digest = {
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kdc_alloc,
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kdc_destroy,
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kdc_probe,
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kdc_type2,
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kdc_type3,
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kdc_free_buffer
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};
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