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#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/vt.h>
#include <errno.h>
#include <fcntl.h>
#define PAM_SM_AUTH
#define PAM_SM_ACCOUNT
#define PAM_SM_SESSION
#define PAM_SM_PASSWORD
#include <security/pam_modules.h>
#include <security/_pam_macros.h>
#define AUTH_DIR "/var/run/console"
#define DATANAME "pam_foreground_console_file"
static void
cleanup(pam_handle_t *pamh, void *filename, int err)
{
unlink((char *)filename);
free(filename);
filename = NULL;
}
/* --- authentication management functions --- */
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags ,
int argc , const char **argv )
{
return PAM_SUCCESS;
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t *pamh , int flags ,
int argc , const char **argv )
{
return PAM_SUCCESS;
}
/* --- account management functions --- */
PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t *pamh , int flags ,
int argc , const char **argv )
{
return PAM_SUCCESS;
}
/* --- password management --- */
PAM_EXTERN int
pam_sm_chauthtok(pam_handle_t *pamh , int flags ,
int argc , const char **argv )
{
return PAM_SUCCESS;
}
/* --- session management --- */
PAM_EXTERN int
pam_sm_open_session(pam_handle_t *pamh , int flags ,
int argc , const char **argv )
{
const char *user=NULL;
struct stat finfo;
char *filename;
unsigned short console;
int fd;
struct vt_stat vtstat;
size_t len;
int retval;
void *rhost=NULL;
retval = pam_get_user(pamh, &user, NULL);
if (retval != PAM_SUCCESS) {
D(("get user returned error: %s", pam_strerror(pamh,retval)));
return retval;
}
retval = pam_get_item(pamh, PAM_RHOST, (const void **)&rhost);
if (retval != PAM_SUCCESS) {
D(("get remote host returned error: %s",
pam_strerror(pamh,retval)));
return retval;
}
/* Skip lockfile creation when non-local */
if (rhost != NULL && *(char *)rhost != '\0') {
return PAM_SUCCESS;
}
if (stat (AUTH_DIR, &finfo)) {
if (errno != ENOENT) {
D(("Can't access %s - %s\n", AUTH_DIR,
strerror(errno)));
goto fail;
} else {
if (mkdir(AUTH_DIR, 0755)) {
D(("Can't mkdir %s - %s\n", AUTH_DIR,
strerror(errno)));
goto fail;
}
stat (AUTH_DIR, &finfo);
}
}
/* Check that it's a directory */
if (!S_ISDIR(finfo.st_mode)) {
D(("%s isn't a directory\n",AUTH_DIR));
goto fail;
}
fd = open("/dev/console", O_RDWR);
if (fd < 1) {
D(("Can't open console - %s\n",strerror(errno)));
goto fail;
}
if (ioctl(fd, VT_GETSTATE, &vtstat)) {
D(("ioctl failed - %s\n",strerror(errno)));
goto fail;
}
close (fd);
console = vtstat.v_active;
if (console > 99) {
D(("Console number too large\n"));
goto fail;
}
len = strlen(user);
len += strlen(AUTH_DIR);
len += 5;
filename = malloc(sizeof(char) * len);
if (filename == NULL) {
D(("Malloc failed\n"));
goto fail;
}
sprintf(filename,"%s/%s:%d",AUTH_DIR,user,console);
fd = open(filename,O_CREAT|O_WRONLY|O_EXCL,0644);
if (fd < 1) {
D(("Can't open %s - %s\n",filename,strerr(errno)));
goto free;
}
/* HURRAH WE GET THERE IN THE END */
close(fd);
/* Store the damn thing */
if (pam_set_data(pamh, DATANAME, (void *) filename, cleanup) != PAM_SUCCESS) {
D(("Can't store data\n"));
goto remove;
}
user = NULL;
return PAM_SUCCESS;
remove:
unlink(filename);
free:
free(filename);
close(fd);
fail:
user = NULL;
return PAM_SESSION_ERR;
}
PAM_EXTERN int
pam_sm_close_session(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
/* If errors happen here, we're screwed. So. */
void *filename;
if (pam_get_data(pamh, DATANAME, (const void **) &filename) == PAM_SUCCESS) {
unlink((char *)filename);
}
return PAM_SUCCESS;
}
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