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/*
pam_get_authtok.c - replacement function for pam_get_authtok()
Copyright (C) 2009 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
*/
#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"
static int prompt_passwd(struct pam_conv *conv,const char *prompt,
char **passwd)
{
struct pam_message msg,*msgs[1];
struct pam_response *resp;
int rc;
/* provide fallback */
*passwd=NULL;
/* set up prompt */
msg.msg_style=PAM_PROMPT_ECHO_OFF;
msg.msg=prompt;
msgs[0]=&msg;
resp=NULL;
rc=conv->conv(1,(const struct pam_message **)msgs,&resp,conv->appdata_ptr);
if (rc!=PAM_SUCCESS)
return rc;
else if (resp==NULL)
return PAM_CONV_ERR;
else if (resp[0].resp==NULL)
{
free(resp);
return PAM_CONV_ERR;
}
*passwd=resp[0].resp;
resp[0].resp=NULL;
free(resp);
return PAM_SUCCESS;
}
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;
struct pam_conv *conv;
char retype_prompt[80];
/* first try to see if the value is already on the stack */
*authtok=NULL;
rc=pam_get_item(pamh,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,&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: ";
}
/* get PAM_CONV */
rc=pam_get_item(pamh,PAM_CONV,(const void **)&conv);
if (rc!=PAM_SUCCESS)
return rc;
/* prepare prompt and get password */
rc=prompt_passwd(conv,prompt,&passwd);
if (rc!=PAM_SUCCESS)
return rc;
/* if a second prompt should be presented, do it */
if (*retype_prompt)
{
rc=prompt_passwd(conv,retype_prompt,&retype_passwd);
/* 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,(const void **)authtok);
}
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