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/*
SSSD
Kerberos 5 Backend Module
Authors:
Sumit Bose <sbose@redhat.com>
Copyright (C) 2009 Red Hat
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "util/child_common.h"
#include "providers/krb5/krb5_auth.h"
#include "providers/krb5/krb5_common.h"
struct krb5_options {
struct dp_option *opts;
struct krb5_ctx *auth_ctx;
};
struct krb5_options *krb5_options = NULL;
struct bet_ops krb5_auth_ops = {
.handler = krb5_pam_handler,
.finalize = NULL,
};
int krb5_ctx_re_destructor(void *memctx)
{
struct krb5_ctx *ctx = (struct krb5_ctx *) memctx;
if (ctx->illegal_path_re) {
pcre_free(ctx->illegal_path_re);
ctx->illegal_path_re = NULL;
}
return 0;
}
int sssm_krb5_auth_init(struct be_ctx *bectx,
struct bet_ops **ops,
void **pvt_auth_data)
{
struct krb5_ctx *ctx = NULL;
int ret;
unsigned v;
FILE *debug_filep;
const char *krb5_servers;
const char *krb5_kpasswd_servers;
const char *krb5_realm;
const char *errstr;
int errval;
int errpos;
time_t renew_intv;
if (krb5_options == NULL) {
krb5_options = talloc_zero(bectx, struct krb5_options);
if (krb5_options == NULL) {
DEBUG(1, ("talloc_zero failed.\n"));
return ENOMEM;
}
ret = krb5_get_options(krb5_options, bectx->cdb, bectx->conf_path,
&krb5_options->opts);
if (ret != EOK) {
DEBUG(1, ("krb5_get_options failed.\n"));
return ret;
}
}
if (krb5_options->auth_ctx != NULL) {
*ops = &krb5_auth_ops;
*pvt_auth_data = krb5_options->auth_ctx;
return EOK;
}
ctx = talloc_zero(bectx, struct krb5_ctx);
if (!ctx) {
DEBUG(1, ("talloc failed.\n"));
return ENOMEM;
}
krb5_options->auth_ctx = ctx;
ctx->action = INIT_PW;
ctx->opts = krb5_options->opts;
krb5_servers = dp_opt_get_string(ctx->opts, KRB5_KDC);
if (krb5_servers == NULL) {
DEBUG(1, ("Missing krb5_server option, using service discovery!\n"));
}
krb5_realm = dp_opt_get_string(ctx->opts, KRB5_REALM);
if (krb5_realm == NULL) {
DEBUG(0, ("Missing krb5_realm option!\n"));
return EINVAL;
}
ret = krb5_service_init(ctx, bectx, SSS_KRB5KDC_FO_SRV, krb5_servers,
krb5_realm, &ctx->service);
if (ret != EOK) {
DEBUG(0, ("Failed to init KRB5 failover service!\n"));
return ret;
}
krb5_kpasswd_servers = dp_opt_get_string(ctx->opts, KRB5_KPASSWD);
if (krb5_kpasswd_servers == NULL && krb5_servers != NULL) {
DEBUG(0, ("Missing krb5_kpasswd option and KDC set explicitly, "
"will use KDC for pasword change operations!\n"));
ctx->kpasswd_service = NULL;
} else {
ret = krb5_service_init(ctx, bectx, SSS_KRB5KPASSWD_FO_SRV,
krb5_kpasswd_servers, krb5_realm,
&ctx->kpasswd_service);
if (ret != EOK) {
DEBUG(0, ("Failed to init KRB5KPASSWD failover service!\n"));
return ret;
}
}
if (dp_opt_get_bool(ctx->opts, KRB5_STORE_PASSWORD_IF_OFFLINE)) {
ret = init_delayed_online_authentication(ctx, bectx, bectx->ev);
if (ret != EOK) {
DEBUG(1, ("init_delayed_online_authentication failed.\n"));
goto fail;
}
}
renew_intv = dp_opt_get_int(ctx->opts, KRB5_RENEW_INTERVAL);
if (renew_intv > 0) {
ret = init_renew_tgt(ctx, bectx, bectx->ev, renew_intv);
if (ret != EOK) {
DEBUG(1, ("init_renew_tgt failed.\n"));
goto fail;
}
}
ret = check_and_export_options(ctx->opts, bectx->domain, ctx);
if (ret != EOK) {
DEBUG(1, ("check_and_export_options failed.\n"));
goto fail;
}
ret = krb5_install_sigterm_handler(bectx->ev, ctx);
if (ret != EOK) {
DEBUG(1, ("krb5_install_sigterm_handler failed.\n"));
goto fail;
}
ret = krb5_install_offline_callback(bectx, ctx);
if (ret != EOK) {
DEBUG(1, ("krb5_install_offline_callback failed.\n"));
goto fail;
}
if (debug_to_file != 0) {
ret = open_debug_file_ex("krb5_child", &debug_filep);
if (ret != EOK) {
DEBUG(0, ("Error setting up logging (%d) [%s]\n",
ret, strerror(ret)));
goto fail;
}
ctx->child_debug_fd = fileno(debug_filep);
if (ctx->child_debug_fd == -1) {
DEBUG(0, ("fileno failed [%d][%s]\n", errno, strerror(errno)));
ret = errno;
goto fail;
}
v = fcntl(ctx->child_debug_fd, F_GETFD, 0);
fcntl(ctx->child_debug_fd, F_SETFD, v & ~FD_CLOEXEC);
}
ctx->illegal_path_re = pcre_compile2(ILLEGAL_PATH_PATTERN, 0,
&errval, &errstr, &errpos, NULL);
if (ctx->illegal_path_re == NULL) {
DEBUG(1, ("Invalid Regular Expression pattern at position %d. "
"(Error: %d [%s])\n", errpos, errval, errstr));
ret = EFAULT;
goto fail;
}
talloc_set_destructor((TALLOC_CTX *) ctx, krb5_ctx_re_destructor);
*ops = &krb5_auth_ops;
*pvt_auth_data = ctx;
return EOK;
fail:
talloc_zfree(krb5_options->auth_ctx);
return ret;
}
int sssm_krb5_chpass_init(struct be_ctx *bectx,
struct bet_ops **ops,
void **pvt_auth_data)
{
return sssm_krb5_auth_init(bectx, ops, pvt_auth_data);
}
int sssm_krb5_access_init(struct be_ctx *bectx,
struct bet_ops **ops,
void **pvt_auth_data)
{
return sssm_krb5_auth_init(bectx, ops, pvt_auth_data);
}
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