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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 "providers/krb5/krb5_auth.h"
struct bet_ops krb5_auth_ops = {
.handler = krb5_pam_handler,
.finalize = NULL,
};
struct bet_ops krb5_chpass_ops = {
.handler = krb5_pam_handler,
.finalize = NULL,
};
int sssm_krb5_auth_init(struct be_ctx *bectx,
struct bet_ops **ops,
void **pvt_auth_data)
{
struct krb5_ctx *ctx = NULL;
char *value = NULL;
int int_value;
int ret;
struct tevent_signal *sige;
struct stat stat_buf;
unsigned v;
FILE *debug_filep;
ctx = talloc_zero(bectx, struct krb5_ctx);
if (!ctx) {
DEBUG(1, ("talloc failed.\n"));
return ENOMEM;
}
ctx->action = INIT_PW;
ret = confdb_get_string(bectx->cdb, ctx, bectx->conf_path,
CONFDB_KRB5_KDCIP, NULL, &value);
if (ret != EOK) goto fail;
if (value == NULL) {
DEBUG(2, ("Missing krb5KDCIP, authentication might fail.\n"));
} else {
ret = setenv(SSSD_KRB5_KDC, value, 1);
if (ret != EOK) {
DEBUG(2, ("setenv %s failed, authentication might fail.\n",
SSSD_KRB5_KDC));
}
}
ctx->kdcip = value;
ret = confdb_get_string(bectx->cdb, ctx, bectx->conf_path,
CONFDB_KRB5_REALM, NULL, &value);
if (ret != EOK) goto fail;
if (value == NULL) {
DEBUG(4, ("Missing krb5REALM authentication might fail.\n"));
} else {
ret = setenv(SSSD_KRB5_REALM, value, 1);
if (ret != EOK) {
DEBUG(2, ("setenv %s failed, authentication might fail.\n",
SSSD_KRB5_REALM));
}
}
ctx->realm = value;
ret = confdb_get_string(bectx->cdb, ctx, bectx->conf_path,
CONFDB_KRB5_CCACHEDIR, "/tmp", &value);
if (ret != EOK) goto fail;
ret = lstat(value, &stat_buf);
if (ret != EOK) {
DEBUG(1, ("lstat for [%s] failed: [%d][%s].\n", value, errno,
strerror(errno)));
goto fail;
}
if ( !S_ISDIR(stat_buf.st_mode) ) {
DEBUG(1, ("Value of krb5ccache_dir [%s] is not a directory.\n", value));
goto fail;
}
ctx->ccache_dir = value;
ret = confdb_get_string(bectx->cdb, ctx, bectx->conf_path,
CONFDB_KRB5_CCNAME_TMPL,
"FILE:%d/krb5cc_%U_XXXXXX",
&value);
if (ret != EOK) goto fail;
if (value[0] != '/' && strncmp(value, "FILE:", 5) != 0) {
DEBUG(1, ("Currently only file based credential caches are supported "
"and krb5ccname_template must start with '/' or 'FILE:'\n"));
goto fail;
}
ctx->ccname_template = value;
ret = confdb_get_string(bectx->cdb, ctx, bectx->conf_path,
CONFDB_KRB5_CHANGEPW_PRINC,
"kadmin/changepw",
&value);
if (ret != EOK) goto fail;
if (strchr(value, '@') == NULL) {
value = talloc_asprintf_append(value, "@%s", ctx->realm);
if (value == NULL) {
DEBUG(7, ("talloc_asprintf_append failed.\n"));
goto fail;
}
}
ctx->changepw_principle = value;
ret = setenv(SSSD_KRB5_CHANGEPW_PRINCIPLE, ctx->changepw_principle, 1);
if (ret != EOK) {
DEBUG(2, ("setenv %s failed, password change might fail.\n",
SSSD_KRB5_CHANGEPW_PRINCIPLE));
}
ret = confdb_get_int(bectx->cdb, ctx, bectx->conf_path,
CONFDB_KRB5_AUTH_TIMEOUT, 15, &int_value);
if (ret != EOK) goto fail;
if (int_value <= 0) {
DEBUG(4, ("krb5auth_timeout has to be a positive value.\n"));
goto fail;
}
ctx->auth_timeout = int_value;
/* TODO: set options */
sige = tevent_add_signal(bectx->ev, ctx, SIGCHLD, SA_SIGINFO,
krb5_child_sig_handler, NULL);
if (sige == NULL) {
DEBUG(1, ("tevent_add_signal failed.\n"));
ret = ENOMEM;
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);
}
*ops = &krb5_auth_ops;
*pvt_auth_data = ctx;
return EOK;
fail:
talloc_free(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);
}
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