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/*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD-style copyright.)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include <security/pam_modules.h>
#include <security/_pam_macros.h>
#include <security/pam_ext.h>
#include "pam_private.h"
int
pam_vprompt (pam_handle_t *pamh, int style, char **response,
const char *fmt, va_list args)
{
struct pam_message msg;
struct pam_response *pam_resp = NULL;
const struct pam_message *pmsg;
const struct pam_conv *conv;
const void *convp;
char *msgbuf;
int retval;
if (response)
*response = NULL;
retval = pam_get_item (pamh, PAM_CONV, &convp);
if (retval != PAM_SUCCESS)
return retval;
conv = convp;
if (conv == NULL || conv->conv == NULL)
{
pam_syslog (pamh, LOG_ERR, "no conversation function");
return PAM_SYSTEM_ERR;
}
if (vasprintf (&msgbuf, fmt, args) < 0)
{
pam_syslog (pamh, LOG_ERR, "vasprintf: %m");
return PAM_BUF_ERR;
}
msg.msg_style = style;
msg.msg = msgbuf;
pmsg = &msg;
retval = conv->conv (1, &pmsg, &pam_resp, conv->appdata_ptr);
if (retval != PAM_SUCCESS && pam_resp != NULL)
pam_syslog(pamh, LOG_WARNING,
"unexpected response from failed conversation function");
if (response)
*response = pam_resp == NULL ? NULL : pam_resp->resp;
else if (pam_resp && pam_resp->resp)
{
_pam_overwrite (pam_resp->resp);
_pam_drop (pam_resp->resp);
}
_pam_overwrite (msgbuf);
_pam_drop (pam_resp);
free (msgbuf);
if (retval != PAM_SUCCESS)
pam_syslog (pamh, LOG_ERR, "conversation failed");
return retval;
}
int
pam_prompt (pam_handle_t *pamh, int style, char **response,
const char *fmt, ...)
{
va_list args;
int retval;
va_start (args, fmt);
retval = pam_vprompt (pamh, style, response, fmt, args);
va_end (args);
return retval;
}
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