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/* This file is part of GNU Pies.
Copyright (C) 2015 Sergey Poznyakoff
GNU Pies 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, or (at your option)
any later version.
GNU Pies 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 GNU Pies. If not, see <http://www.gnu.org/licenses/>. */
#include "ident.h"
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#if defined(HAVE_CRYPT_H)
# include <crypt.h>
#endif
#if defined(HAVE_SHADOW_H)
# include <shadow.h>
#endif
struct system_identity_data
{
gid_t gid;
};
static int
system_authenticate (pies_identity_provider_t pr, pies_identity_t id,
char const *passwd)
{
struct passwd *pwd;
char *encrypted_pass = NULL;
pwd = getpwnam (id->username);
if (!pwd)
return -1;
encrypted_pass = pwd->pw_passwd;
#if defined(HAVE_SHADOW_H)
{
struct spwd *sp;
if ((sp = getspnam (id->username)) != NULL)
{
if (sp->sp_expire > 0 && time (NULL) > sp->sp_expire * 86400)
return -1;
encrypted_pass = sp->sp_pwdp;
}
}
#endif
if (strcmp (crypt (passwd, encrypted_pass), encrypted_pass) == 0)
{
struct system_identity_data *data = xmalloc (sizeof (*data));
data->gid = pwd->pw_gid;
id->data = data;
return 0;
}
return -1;
}
static int
system_is_group_member (pies_identity_provider_t provider,
pies_identity_t id, char * const * groups)
{
struct system_identity_data *data = id->data;
struct group *gr;
int result = 0;
setgrent ();
while ((gr = getgrent ()))
{
char **p;
if (!is_array_member (groups, gr->gr_name))
continue;
if (gr->gr_gid == data->gid)
{
result = 1;
break;
}
for (p = gr->gr_mem; *p; p++)
if (strcmp (*p, id->username) == 0)
{
result = 1;
break;
}
}
endgrent ();
return result;
}
static void
system_destroy_identity (pies_identity_provider_t p, pies_identity_t id)
{
if (id->data)
free (id->data);
}
static void
confhelp (void)
{
static struct grecs_keyword kw[] = {
{ "type", "'system", "Set mechanism type", grecs_type_null },
{ NULL }
};
static struct grecs_keyword top[] = {
{ "identity-provider", "name: string",
"Configuration for system identity provider",
grecs_type_section, GRECS_INAC, NULL, 0, NULL, NULL,
kw },
{ NULL }
};
grecs_print_statement_array (top, 1, 0, stdout);
}
struct pies_identity_mechanism system_identity_mechanism = {
"system",
system_authenticate,
system_is_group_member,
system_destroy_identity,
NULL,
confhelp
};
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