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/*
* auth.c -- PAM authorization code, common between chsh and chfn
* (c) 2012 by Cody Maloney <cmaloney@theoreticalchaos.com>
*
* this program is free software. you can redistribute it and
* modify it under the terms of the gnu general public license.
* there is no warranty.
*
*/
#include <security/pam_appl.h>
#ifdef HAVE_SECURITY_PAM_MISC_H
# include <security/pam_misc.h>
#elif defined(HAVE_SECURITY_OPENPAM_H)
# include <security/openpam.h>
#endif
#include "c.h"
#include "auth.h"
static int pam_fail_check(pam_handle_t *pamh, int retcode)
{
if (retcode == PAM_SUCCESS)
return 0;
warnx("%s", pam_strerror(pamh, retcode));
pam_end(pamh, retcode);
return 1;
}
int auth_pam(const char *service_name, uid_t uid, const char *username)
{
if (uid != 0) {
pam_handle_t *pamh = NULL;
#ifdef HAVE_SECURITY_PAM_MISC_H
struct pam_conv conv = { misc_conv, NULL };
#elif defined(HAVE_SECURITY_OPENPAM_H)
struct pam_conv conv = { openpam_ttyconv, NULL };
#endif
int retcode;
retcode = pam_start(service_name, username, &conv, &pamh);
if (pam_fail_check(pamh, retcode))
return FALSE;
retcode = pam_authenticate(pamh, 0);
if (pam_fail_check(pamh, retcode))
return FALSE;
retcode = pam_acct_mgmt(pamh, 0);
if (retcode == PAM_NEW_AUTHTOK_REQD)
retcode =
pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
if (pam_fail_check(pamh, retcode))
return FALSE;
retcode = pam_setcred(pamh, 0);
if (pam_fail_check(pamh, retcode))
return FALSE;
pam_end(pamh, 0);
/* no need to establish a session; this isn't a
* session-oriented activity... */
}
return TRUE;
}
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