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/*
*
* Author: gplll <gplll1818@gmail.com>, Oct 2014
*
*/
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <malloc.h>
#include <string.h>
#include <pthread.h>
#include <syslog.h>
#include <netdb.h>
#include <nss.h>
#include <errno.h>
#include <pwd.h>
#include <curl/curl.h>
#include "jsmn.h"
#include "sp_api.h"
#include "nss_sp.h"
#define SP_INIT \
if ((sp_config.status != SP_INITED)) { \
if (!(sp_init ())) return NSS_STATUS_UNAVAIL; \
}
static pthread_mutex_t sp_lock = PTHREAD_MUTEX_INITIALIZER;
static int get_user_list = 0;
static char **user_list = NULL; /* pointer to cached user list */
static int u_len = 0; /* number of users in cached user list */
static int u_idx; /* Index of next user to be read into list */
void _nss_sp_enter (void) {
NSS_SP_LOCK (sp_lock);
}
void _nss_sp_leave (void) {
NSS_SP_UNLOCK (sp_lock);
}
enum nss_status _nss_sp_setpwent (void) {
SP_INIT;
debug (2, "==> _nss_sp_setpwent");
_nss_sp_enter ();
get_user_list = 1;
_nss_sp_leave ();
return NSS_STATUS_SUCCESS;
}
enum nss_status _nss_sp_endpwent (void) {
SP_INIT;
debug (2, "==> _nss_sp_endpwent");
_nss_sp_enter ();
get_user_list = 1;
_nss_sp_leave ();
return NSS_STATUS_SUCCESS;
}
enum nss_status _nss_sp_getpwnam_r (const char *name,
struct passwd *result,
char *buffer, size_t buflen, int *errnop) {
sp_xattrs_t *xattrs;
SP_INIT;
debug (2, "==> _nss_sp_getpwnam_r name=%s", name);
/* hack to avoid bash completion issue */
if (strcmp (name, "*") == 0) {
return NSS_STATUS_NOTFOUND;
}
/* call SP API */
int rc = sp_xattrs_p (&xattrs, name, 1);
if (rc == -1) {
debug (1, "sp_xattrs() returned error");
return NSS_STATUS_NOTFOUND;
} else {
int nlen = strlen (name);
/* check buffer space */
if ((nlen + 5) > buflen) {
*errnop = ERANGE;
free (xattrs);
return NSS_STATUS_TRYAGAIN;
}
/* Fill the output fields */
int pos = 0;
result->pw_uid = strtoul(xattrs->posixuid, NULL, 10);
result->pw_gid = strtoul(xattrs->posixgid, NULL, 10);
result->pw_name = buffer;
strcpy (buffer, name);
pos += strlen (name) + 1;
result->pw_passwd = buffer + pos;
buffer[pos] = 0;
pos++;
result->pw_gecos = buffer + pos;
strcpy (result->pw_gecos, xattrs->posixgecos);
pos += strlen (result->pw_gecos) + 1;
result->pw_dir = buffer + pos;
strcpy (result->pw_dir, xattrs->posixhomedir);
pos += strlen (result->pw_dir) + 1;
result->pw_shell = buffer + pos;
strcpy (result->pw_shell, xattrs->posixshell);
pos += strlen (result->pw_shell) + 1;
free (xattrs);
return NSS_STATUS_SUCCESS;
}
}
static int get_users_list () {
if (user_list != NULL) {
/* free previous cached user list */
debug (1, "freeing previous user list");
free (user_list);
user_list = NULL;
u_len = 0;
}
/*Call SP API to get list of users */
int num_users = sp_list_users (&user_list, NULL);
if (num_users <= 0) {
debug (1, "sp_list_users() returned error or no user in realm (%d)", num_users);
return -1;
}
u_len = num_users;
u_idx = 0;
get_user_list = 0;
return 0;
}
enum nss_status _nss_sp_getpwent_r (struct passwd *result,
char *buffer, size_t buflen, int *errnop) {
SP_INIT;
debug (2, "==> _nss_sp_getpwent_r");
_nss_sp_enter ();
if (get_user_list) {
if (get_users_list () == -1) {
_nss_sp_leave ();
return NSS_STATUS_NOTFOUND;
}
}
/* Call SP API to get next entry */
if (u_idx == u_len) {
/* reached end of list */
_nss_sp_leave ();
return NSS_STATUS_NOTFOUND;
}
char *s = *(user_list + u_idx);
enum nss_status rc = _nss_sp_getpwnam_r (strtok (s, "@"), result, buffer, buflen, errnop);
*(s + strlen(s)) = '@';
u_idx++;
_nss_sp_leave ();
return rc;
}
enum nss_status _nss_sp_getpwuid_r (uid_t uid,
struct passwd *result,
char *buffer, size_t buflen, int *errnop) {
enum nss_status rc;
int i;
SP_INIT;
debug (2, "==> _nss_sp_getpwuid_r uid=0x%x", uid);
/* hack to avoid 'su' delay */
if ((int) uid == -1) {
error ("nss_sp_getpwuid_r called with uid=-1");
return NSS_STATUS_NOTFOUND;
}
/*
* As SecurePass doesn't provide an API to get the user attrs fron the uid, we need to scan the user's list
*/
_nss_sp_enter ();
if (u_len <= 0) {
/*Call SP API to get list of users */
if (get_users_list () == -1) {
_nss_sp_leave ();
return NSS_STATUS_NOTFOUND;
}
}
for (i = 0; i < u_len; i++) {
char *s = *(user_list + i);
rc = _nss_sp_getpwnam_r (strtok (s, "@"), result, buffer, buflen, errnop);
*(s + strlen(s)) = '@';
if (rc != NSS_STATUS_SUCCESS) {
_nss_sp_leave ();
return rc;
}
if (uid == result->pw_uid) {
_nss_sp_leave ();
return NSS_STATUS_SUCCESS;
}
}
_nss_sp_leave ();
return NSS_STATUS_NOTFOUND;
}
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