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/*
* Copyright (c) 2009 - 2010, Nicolas François
* All rights reserved.
*
* 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, this list of conditions and the following disclaimer.
* 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 copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``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 COPYRIGHT
* HOLDERS OR CONTRIBUTORS 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>
#ident "$Id:$"
#ifdef USE_PAM
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <security/pam_appl.h>
#include "prototypes.h"
/*@null@*/ /*@only@*/static const char *non_interactive_password = NULL;
static int ni_conv (int num_msg,
const struct pam_message **msg,
struct pam_response **resp,
unused void *appdata_ptr);
static struct pam_conv non_interactive_pam_conv = {
ni_conv,
NULL
};
static int ni_conv (int num_msg,
const struct pam_message **msg,
struct pam_response **resp,
unused void *appdata_ptr)
{
struct pam_response *responses;
int count;
assert (NULL != non_interactive_password);
if (num_msg <= 0) {
return PAM_CONV_ERR;
}
responses = (struct pam_response *) calloc ((size_t) num_msg,
sizeof (*responses));
if (NULL == responses) {
return PAM_CONV_ERR;
}
for (count=0; count < num_msg; count++) {
responses[count].resp_retcode = 0;
switch (msg[count]->msg_style) {
case PAM_PROMPT_ECHO_ON:
fprintf (shadow_logfd,
_("%s: PAM modules requesting echoing are not supported.\n"),
Prog);
goto failed_conversation;
case PAM_PROMPT_ECHO_OFF:
responses[count].resp = strdup (non_interactive_password);
if (NULL == responses[count].resp) {
goto failed_conversation;
}
break;
case PAM_ERROR_MSG:
if ( (NULL == msg[count]->msg)
|| (fprintf (shadow_logfd, "%s\n", msg[count]->msg) <0)) {
goto failed_conversation;
}
responses[count].resp = NULL;
break;
case PAM_TEXT_INFO:
if ( (NULL == msg[count]->msg)
|| (fprintf (stdout, "%s\n", msg[count]->msg) <0)) {
goto failed_conversation;
}
responses[count].resp = NULL;
break;
default:
(void) fprintf (shadow_logfd,
_("%s: conversation type %d not supported.\n"),
Prog, msg[count]->msg_style);
goto failed_conversation;
}
}
*resp = responses;
return PAM_SUCCESS;
failed_conversation:
for (count=0; count < num_msg; count++) {
if (NULL != responses[count].resp) {
memset (responses[count].resp, 0,
strlen (responses[count].resp));
free (responses[count].resp);
responses[count].resp = NULL;
}
}
free (responses);
*resp = NULL;
return PAM_CONV_ERR;
}
/*
* Change non interactively the user's password using PAM.
*
* Return 0 on success, 1 on failure.
*/
int do_pam_passwd_non_interactive (const char *pam_service,
const char *username,
const char* password)
{
pam_handle_t *pamh = NULL;
int ret;
ret = pam_start (pam_service, username, &non_interactive_pam_conv, &pamh);
if (ret != PAM_SUCCESS) {
fprintf (shadow_logfd,
_("%s: (user %s) pam_start failure %d\n"),
Prog, username, ret);
return 1;
}
non_interactive_password = password;
ret = pam_chauthtok (pamh, 0);
if (ret != PAM_SUCCESS) {
fprintf (shadow_logfd,
_("%s: (user %s) pam_chauthtok() failed, error:\n"
"%s\n"),
Prog, username, pam_strerror (pamh, ret));
}
(void) pam_end (pamh, PAM_SUCCESS);
return ((PAM_SUCCESS == ret) ? 0 : 1);
}
#else /* !USE_PAM */
extern int errno; /* warning: ANSI C forbids an empty source file */
#endif /* !USE_PAM */
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