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/*
pam.c - pam processing routines
Copyright (C) 2009 Howard Chu
Copyright (C) 2009-2014 Arthur de Jong
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#define _GNU_SOURCE /* for crypt_r(3) in crypt.h */
#include <crypt.h>
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif /* HAVE_STDINT_H */
#include <time.h>
#include "common.h"
#include "log.h"
#include "cfg.h"
#include "common/dict.h"
#include "common/expr.h"
struct authc {
int authc_rc;
int authz_rc;
char authz_msg[BUFLEN_MESSAGE];
};
struct authz {
int authz_rc;
char authz_msg[BUFLEN_MESSAGE];
};
static int check_password(const char *password, const char *hash)
{
int ret;
struct crypt_data data;
data.initialized = 0;
ret = (strcmp(crypt_r(password, hash, &data), hash) == 0);
memset(&data, 0, sizeof(data));
return ret;
}
static int check_password_age(struct session *session, const char *username,
char *authzmsg, size_t authzmsgsz,
int check_maxdays, int check_mindays)
{
/* hackers.git doesn't use aging features */
return NSLCD_PAM_SUCCESS;
}
/* check authentication credentials of the user */
NSLCD_HANDLE_UID(PAM, AUTHC
,/* decls */
char username[BUFLEN_NAME];
char service[BUFLEN_NAME];
char ruser[BUFLEN_NAME];
char rhost[HOST_NAME_MAX+1];
char tty[64];
char password[BUFLEN_PASSWORD];
struct authc _entry;
,/* read */
READ_STRING(fp, username);
READ_STRING(fp, service);
READ_STRING(fp, ruser);
READ_STRING(fp, rhost);
READ_STRING(fp, tty);
READ_STRING(fp, password);
log_setrequest("authc=\"%s\"", username);
log_log(LOG_DEBUG, "nslcd_pam_authc(\"%s\",\"%s\",\"%s\")",
username, service, *password ? "***" : "");
,/* check */
if (!isvalidname(username))
{
log_log(LOG_WARNING, "request denied by validnames option");
return -1;
}
,/* search(int *rcp) */
struct authc,
static size_t i = 0;
struct passwd *user = NULL;
struct authc *entry = &_entry;
for (; i < session->cnt; i++)
{
if (STR_CMP(username, session->users[i].pw_name)==0) {
*rcp = 0;
i = session->cnt;
user = &(session->users[i]);
}
}
if (user == NULL)
return NULL;
entry->authz_msg[0] = '\0';
/* try authentication */
entry->authc_rc = check_password(password, NULL /* TODO */)
? NSLCD_PAM_SUCCESS
: NSLCD_PAM_AUTH_ERR;
entry->authz_rc = entry->authc_rc;
/*myldap_get_policy_response(session, &(entry->authz_rc), &(entry->authz_msg))*/
/* perform shadow attribute checks */
if (entry->authz_rc == NSLCD_PAM_SUCCESS)
entry->authz_rc = check_password_age(session, username, entry->authz_msg, sizeof(entry->authz_msg), 1, 0);
return entry;
,/* write */
WRITE_INT32(fp, NSLCD_RESULT_BEGIN);
WRITE_INT32( fp, entry->authc_rc);
WRITE_STRING(fp, username);
WRITE_INT32( fp, entry->authz_rc);
WRITE_STRING(fp, entry->authz_msg);
return 0;
,/* cleanup */
memset(password, 0, sizeof(password));
)
/* check authorisation of the user */
NSLCD_HANDLE(PAM, AUTHZ
,/* decls */
char username[BUFLEN_NAME];
char service[BUFLEN_NAME];
char ruser[BUFLEN_NAME];
char rhost[HOST_NAME_MAX+1];
char tty[64];
struct authz _entry;
,/* read */
READ_STRING(fp, username);
READ_STRING(fp, service);
READ_STRING(fp, ruser);
READ_STRING(fp, rhost);
READ_STRING(fp, tty);
/* log call */
log_setrequest("authz=\"%s\"", username);
log_log(LOG_DEBUG, "nslcd_pam_authz(\"%s\",\"%s\",\"%s\",\"%s\",\"%s\")",
username, service, ruser, rhost, tty);
,/* check */
,/* search(int *rcp) */
struct authz,
struct passwd *user = NULL;
struct authz *entry = &_entry;
for (size_t i = 0; i < session->cnt; i++)
{
if (STR_CMP(username, session->users[i].pw_name)==0) {
*rcp = 0;
i = session->cnt;
user = &(session->users[i]);
}
}
if (user == NULL)
return NULL;
/* check authorisation search */
/* TODO */
/*int rc = LDAP_SUCCESS;
if (rc != LDAP_SUCCESS)*/
if (0)
{
entry->authz_rc = NSLCD_PAM_PERM_DENIED;
strcpy(entry->authz_msg, "LDAP authorisation check failed");
} else {
/* perform shadow attribute checks */
entry->authz_rc = check_password_age(session, username,
entry->authz_msg, sizeof(entry->authz_msg),
0, 0);
}
return entry;
,/* write response */
WRITE_INT32(fp, NSLCD_RESULT_BEGIN);
WRITE_INT32( fp, entry->authz_rc);
WRITE_STRING(fp, entry->authz_msg);
return 0;
,/* cleanup */
)
NSLCD_HANDLE(PAM, SESS_O
,/* decls */
char username[BUFLEN_NAME];
char service[BUFLEN_NAME];
char ruser[BUFLEN_NAME];
char rhost[HOST_NAME_MAX+1];
char tty[64];
char sessionid[25];
static const char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"01234567890";
size_t i;
,/* read */
READ_STRING(fp, username);
READ_STRING(fp, service);
READ_STRING(fp, ruser);
READ_STRING(fp, rhost);
READ_STRING(fp, tty);
/* generate pseudo-random session id */
for (i = 0; i < (sizeof(sessionid) - 1); i++)
sessionid[i] = alphabet[rand() % (sizeof(alphabet) - 1)];
sessionid[i] = '\0';
/* log call */
log_setrequest("sess_o=\"%s\"", username);
log_log(LOG_DEBUG, "nslcd_pam_sess_o(\"%s\",\"%s\",\"%s\",\"%s\",\"%s\"): %s",
username, service, tty, rhost, ruser, sessionid);
,/* check */
,/* search */
void,
if (*rcp != 0) /* first time through, set success=0 (no errors), return non-NULL */
{
return (void*)1;
*rcp = 0;
}
else /* second time through, exit by returning NULL */
{
return NULL;
}
,/* write */
WRITE_INT32(fp, NSLCD_RESULT_BEGIN);
WRITE_STRING(fp, sessionid);
return 0;
,/* cleanup */
)
NSLCD_HANDLE(PAM, SESS_C
,/* decls */
char username[BUFLEN_NAME];
char service[BUFLEN_NAME];
char ruser[BUFLEN_NAME];
char rhost[HOST_NAME_MAX+1];
char tty[64];
char sessionid[64];
,/* read */
READ_STRING(fp, username);
READ_STRING(fp, service);
READ_STRING(fp, ruser);
READ_STRING(fp, rhost);
READ_STRING(fp, tty);
READ_STRING(fp, sessionid);
log_setrequest("sess_c=\"%s\"", username);
log_log(LOG_DEBUG, "nslcd_pam_sess_c(\"%s\",\"%s\",%s)",
username, service, sessionid);
,/* check */
,/* search */
void,
if (*rcp != 0) /* first time through, set success=0 (no errors), return non-NULL */
{
return (void*)1;
*rcp = 0;
}
else /* second time through, exit by returning NULL */
{
return NULL;
}
,/* write */
WRITE_INT32(fp, NSLCD_RESULT_BEGIN);
return 0;
,/* cleanup */
)
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