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/*
* Copyright (c) 2008 Seraphim Mellos <mellos@ceid.upatras.gr>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <pwd.h>
#define PAM_SM_AUTH
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <security/pam_mod_misc.h>
#define NOLOGIN "/etc/nologin"
PAM_EXTERN int
pam_sm_authenticate( pam_handle_t *pamh, int flags,
int argc, const char * argv[] )
{
struct passwd *pwd;
struct stat st;
char *mtmp = NULL;
const char * user;
int pam_err, fd;
if( (pam_err = pam_get_user(pamh,&user, NULL)) != PAM_SUCCESS ||
(user == NULL) ) {
PAM_ERROR("Could not determine user");
return (PAM_USER_UNKNOWN);
}
fd = open(NOLOGIN, O_RDONLY, 0);
/*
* LinuxPAM's nologin returns PAM_IGNORE when no 'nologin' file is
* present while freebsd's nologin returns PAM_SUCCESS. We'll go
* with PAM_IGNORE
* */
if (fd < 0 )
return (PAM_IGNORE);
pwd = getpwnam(user);
if(pwd && pwd->pw_uid == 0 )
pam_err = PAM_SUCCESS;
else {
if ( ! pwd )
pam_err = PAM_USER_UNKNOWN;
else
pam_err = PAM_AUTH_ERR;
}
/* get contents of /etc/nologin */
if (fstat(fd,&st) < 0) {
close(fd);
free(mtmp);
return (pam_err);
}
mtmp = malloc(st.st_size + 1);
if (!mtmp) {
PAM_ERROR("Out of memory");
close(fd);
free(mtmp);
return (PAM_BUF_ERR);
}
if ( read(fd, mtmp, st.st_size) == st.st_size ) {
mtmp[st.st_size] = '\0';
PAM_ERROR("%s", mtmp);
} else
pam_err = PAM_SYSTEM_ERR;
close(fd);
free (mtmp);
return (pam_err);
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t *pamh , int flags ,
int argc , const char *argv[])
{
return (PAM_SUCCESS);
}
PAM_MODULE_ENTRY("pam_nologin");
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