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/* User authentication for vtysh.
* Copyright (C) 2000 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra 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, or (at your option) any
* later version.
*
* GNU Zebra 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; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include <lib/version.h>
#include <pwd.h>
#ifdef USE_PAM
#include <security/pam_appl.h>
#ifdef HAVE_PAM_MISC_H
#include <security/pam_misc.h>
#endif
#ifdef HAVE_OPENPAM_H
#include <security/openpam.h>
#endif
#endif /* USE_PAM */
#include "memory.h"
#include "linklist.h"
#include "command.h"
#include "vtysh/vtysh_user.h"
/*
* Compiler is warning about prototypes not being declared.
* The DEFUNSH and DEFUN macro's are messing with the
* compiler I believe. This is just to make it happy.
*/
#ifdef USE_PAM
static int vtysh_pam(const char *);
#endif
int vtysh_auth(void);
void vtysh_user_init(void);
extern struct list *config_top;
extern void config_add_line(struct list *config, const char *line);
#ifdef USE_PAM
static struct pam_conv conv =
{
PAM_CONV_FUNC,
NULL
};
static int
vtysh_pam (const char *user)
{
int ret;
pam_handle_t *pamh = NULL;
/* Start PAM. */
ret = pam_start(FRR_PAM_NAME, user, &conv, &pamh);
/* printf ("ret %d\n", ret); */
/* Is user really user? */
if (ret == PAM_SUCCESS)
ret = pam_authenticate (pamh, 0);
/* printf ("ret %d\n", ret); */
#if 0
/* Permitted access? */
if (ret == PAM_SUCCESS)
ret = pam_acct_mgmt (pamh, 0);
printf ("ret %d\n", ret);
if (ret == PAM_AUTHINFO_UNAVAIL)
ret = PAM_SUCCESS;
#endif /* 0 */
/* This is where we have been authorized or not. */
#ifdef DEBUG
if (ret == PAM_SUCCESS)
printf("Authenticated\n");
else
printf("Not Authenticated\n");
#endif /* DEBUG */
/* close Linux-PAM */
if (pam_end (pamh, ret) != PAM_SUCCESS)
{
pamh = NULL;
fprintf(stderr, "vtysh_pam: failed to release authenticator\n");
exit(1);
}
return ret == PAM_SUCCESS ? 0 : 1;
}
#endif /* USE_PAM */
struct vtysh_user
{
char *name;
u_char nopassword;
};
struct list *userlist;
static struct vtysh_user *
user_new (void)
{
return XCALLOC (MTYPE_TMP, sizeof (struct vtysh_user));
}
static struct vtysh_user *
user_lookup (const char *name)
{
struct listnode *node, *nnode;
struct vtysh_user *user;
for (ALL_LIST_ELEMENTS (userlist, node, nnode, user))
{
if (strcmp (user->name, name) == 0)
return user;
}
return NULL;
}
void
user_config_write ()
{
struct listnode *node, *nnode;
struct vtysh_user *user;
char line[128];
for (ALL_LIST_ELEMENTS (userlist, node, nnode, user))
{
if (user->nopassword)
{
sprintf(line, "username %s nopassword", user->name);
config_add_line (config_top, line);
}
}
}
static struct vtysh_user *
user_get (const char *name)
{
struct vtysh_user *user;
user = user_lookup (name);
if (user)
return user;
user = user_new ();
user->name = strdup (name);
listnode_add (userlist, user);
return user;
}
DEFUN (vtysh_banner_motd_file,
vtysh_banner_motd_file_cmd,
"banner motd file FILE",
"Set banner\n"
"Banner for motd\n"
"Banner from a file\n"
"Filename\n")
{
int idx_file = 3;
return cmd_banner_motd_file (argv[idx_file]->arg);
}
DEFUN (username_nopassword,
username_nopassword_cmd,
"username WORD nopassword",
"\n"
"\n"
"\n")
{
int idx_word = 1;
struct vtysh_user *user;
user = user_get (argv[idx_word]->arg);
user->nopassword = 1;
return CMD_SUCCESS;
}
int
vtysh_auth (void)
{
struct vtysh_user *user;
struct passwd *passwd;
if ((passwd = getpwuid (geteuid ())) == NULL)
{
fprintf (stderr, "could not lookup user ID %d\n", (int) geteuid());
exit (1);
}
user = user_lookup (passwd->pw_name);
if (user && user->nopassword)
/* Pass through */;
else
{
#ifdef USE_PAM
if (vtysh_pam (passwd->pw_name))
exit (0);
#endif /* USE_PAM */
}
return 0;
}
char *
vtysh_get_home (void)
{
struct passwd *passwd;
char * homedir;
if ((homedir = getenv("HOME")) != 0)
return homedir;
/* Fallback if HOME is undefined */
passwd = getpwuid (getuid ());
return passwd ? passwd->pw_dir : NULL;
}
void
vtysh_user_init (void)
{
userlist = list_new ();
install_element (CONFIG_NODE, &username_nopassword_cmd);
install_element (CONFIG_NODE, &vtysh_banner_motd_file_cmd);
}
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