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/*
Unix SMB/CIFS implementation.
Kerberos utility functions for GENSEC
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "system/kerberos.h"
#include "system/time.h"
#include "system/network.h"
#include "auth/kerberos/kerberos.h"
#include "auth/auth.h"
struct ccache_container {
struct smb_krb5_context *smb_krb5_context;
krb5_ccache ccache;
} ccache_container;
static int free_ccache(void *ptr) {
struct ccache_container *ccc = ptr;
/* current heimdal - 0.6.3, which we need anyway, fixes segfaults here */
krb5_cc_close(ccc->smb_krb5_context->krb5_context, ccc->ccache);
return 0;
}
/**
* Return a freshly allocated ccache (destroyed by destructor on child
* of parent_ctx), for a given set of client credentials
*/
NTSTATUS kinit_to_ccache(TALLOC_CTX *parent_ctx,
struct cli_credentials *credentials,
struct smb_krb5_context *smb_krb5_context,
krb5_ccache *ccache,
const char **ccache_name)
{
krb5_error_code ret;
const char *password;
char *ccache_string;
time_t kdc_time = 0;
struct ccache_container *mem_ctx = talloc(parent_ctx, struct ccache_container);
if (!mem_ctx) {
return NT_STATUS_NO_MEMORY;
}
password = cli_credentials_get_password(credentials);
/* this string should be unique */
ccache_string = talloc_asprintf(mem_ctx, "MEMORY:%s_%s",
cli_credentials_get_principal(credentials, mem_ctx),
generate_random_str(mem_ctx, 16));
ret = krb5_cc_resolve(smb_krb5_context->krb5_context, ccache_string, ccache);
if (ret) {
DEBUG(1,("failed to generate a new krb5 keytab (%s): %s\n",
ccache_string,
error_message(ret)));
talloc_free(mem_ctx);
return NT_STATUS_INTERNAL_ERROR;
}
mem_ctx->smb_krb5_context = talloc_reference(mem_ctx, smb_krb5_context);
mem_ctx->ccache = *ccache;
talloc_set_destructor(mem_ctx, free_ccache);
ret = kerberos_kinit_password_cc(smb_krb5_context->krb5_context, *ccache,
cli_credentials_get_principal(credentials, mem_ctx),
password, NULL, &kdc_time);
/* cope with ticket being in the future due to clock skew */
if ((unsigned)kdc_time > time(NULL)) {
time_t t = time(NULL);
int time_offset =(unsigned)kdc_time-t;
DEBUG(4,("Advancing clock by %d seconds to cope with clock skew\n", time_offset));
krb5_set_real_time(smb_krb5_context->krb5_context, t + time_offset + 1, 0);
}
if (ret == KRB5KRB_AP_ERR_SKEW || ret == KRB5_KDCREP_SKEW) {
DEBUG(1,("kinit for %s failed (%s)\n",
cli_credentials_get_principal(credentials, mem_ctx),
smb_get_krb5_error_message(smb_krb5_context->krb5_context,
ret, mem_ctx)));
talloc_free(mem_ctx);
return NT_STATUS_TIME_DIFFERENCE_AT_DC;
}
if (ret) {
DEBUG(1,("kinit for %s failed (%s)\n",
cli_credentials_get_principal(credentials, mem_ctx),
smb_get_krb5_error_message(smb_krb5_context->krb5_context,
ret, mem_ctx)));
talloc_free(mem_ctx);
return NT_STATUS_WRONG_PASSWORD;
}
*ccache_name = ccache_string;
return NT_STATUS_OK;
}
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