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/*
pam_get_authtok.c - replacement function for pam_get_authtok()
Copyright (C) 2009, 2010, 2012 Arthur de Jong
Copyright (C) 2010 Symas Corporation
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
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/types.h>
#include "compat/attrs.h"
#include "compat/pam_compat.h"
/* warning: this version assumes that try_first_pass is specified */
int pam_get_authtok(pam_handle_t *pamh, int item, const char **authtok,
const char *prompt)
{
int rc;
char *passwd = NULL, *retype_passwd = NULL;
const void *oldauthtok;
char retype_prompt[80];
/* first try to see if the value is already on the stack */
*authtok = NULL;
rc = pam_get_item(pamh, item, (PAM_ITEM_CONST void **)authtok);
if ((rc == PAM_SUCCESS) && (*authtok != NULL))
return PAM_SUCCESS;
/* check what to prompt for and provide default prompt */
*retype_prompt = '\0';
if (item == PAM_OLDAUTHTOK)
prompt = (prompt != NULL) ? prompt : "Old Password: ";
else
{
rc = pam_get_item(pamh, PAM_OLDAUTHTOK, (PAM_ITEM_CONST void **)&oldauthtok);
if ((rc == PAM_SUCCESS) && (oldauthtok != NULL))
{
prompt = (prompt != NULL) ? prompt : "New Password: ";
snprintf(retype_prompt, sizeof(retype_prompt), "Retype %s", prompt);
retype_prompt[sizeof(retype_prompt) - 1] = '\0';
}
else
prompt = (prompt != NULL) ? prompt : "Password: ";
}
/* prepare prompt and get password */
rc = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &passwd, "%s", prompt);
if (rc != PAM_SUCCESS)
return rc;
/* if a second prompt should be presented, do it */
if (*retype_prompt)
{
rc = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &retype_passwd, "%s",
retype_prompt);
/* check passwords */
if ((rc == PAM_SUCCESS) && (strcmp(retype_passwd, passwd) != 0))
rc = PAM_AUTHTOK_RECOVERY_ERR;
}
/* store the password if everything went ok */
if (rc == PAM_SUCCESS)
rc = pam_set_item(pamh, item, passwd);
/* clear and free any password information */
memset(passwd, 0, strlen(passwd));
free(passwd);
if (retype_passwd != NULL)
{
memset(retype_passwd, 0, strlen(retype_passwd));
free(retype_passwd);
}
if (rc != PAM_SUCCESS)
return rc;
/* return token from the stack */
return pam_get_item(pamh, item, (PAM_ITEM_CONST void **)authtok);
}
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