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/*-
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by ThinkSec AS and
* NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* 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 author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $P4: //depot/projects/openpam/lib/pam_get_authtok.c#16 $
*/
#include <sys/param.h>
#include <stdlib.h>
#include <security/pam_appl.h>
#include <security/openpam.h>
#include "openpam_impl.h"
const char authtok_prompt[] = "Password:";
const char oldauthtok_prompt[] = "Old Password:";
const char newauthtok_prompt[] = "New Password:";
/*
* OpenPAM extension
*
* Retrieve authentication token
*/
int
pam_get_authtok(pam_handle_t *pamh,
int item,
const char **authtok,
const char *prompt)
{
const void *oldauthtok;
const char *default_prompt;
char *resp, *resp2;
int pitem, r, style, twice;
if (pamh == NULL || authtok == NULL)
return (PAM_SYSTEM_ERR);
*authtok = NULL;
twice = 0;
switch (item) {
case PAM_AUTHTOK:
pitem = PAM_AUTHTOK_PROMPT;
default_prompt = authtok_prompt;
r = pam_get_item(pamh, PAM_OLDAUTHTOK, &oldauthtok);
if (r == PAM_SUCCESS && oldauthtok != NULL) {
default_prompt = newauthtok_prompt;
twice = 1;
}
break;
case PAM_OLDAUTHTOK:
pitem = PAM_OLDAUTHTOK_PROMPT;
default_prompt = oldauthtok_prompt;
twice = 0;
break;
default:
return (PAM_SYMBOL_ERR);
}
if (openpam_get_option(pamh, "try_first_pass") ||
openpam_get_option(pamh, "use_first_pass")) {
r = pam_get_item(pamh, item, (const void **)authtok);
if (r == PAM_SUCCESS && *authtok != NULL)
return (PAM_SUCCESS);
else if (openpam_get_option(pamh, "use_first_pass"))
return (r == PAM_SUCCESS ? PAM_AUTH_ERR : r);
}
if (prompt == NULL) {
r = pam_get_item(pamh, pitem, (const void **)&prompt);
if (r != PAM_SUCCESS || prompt == NULL)
prompt = default_prompt;
}
style = openpam_get_option(pamh, "echo_pass") ?
PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF;
r = pam_prompt(pamh, style, &resp, "%s", prompt);
if (r != PAM_SUCCESS)
return (r);
if (twice) {
r = pam_prompt(pamh, style, &resp2, "Retype %s", prompt);
if (r != PAM_SUCCESS) {
free(resp);
return (r);
}
if (strcmp(resp, resp2) != 0) {
free(resp);
resp = NULL;
}
free(resp2);
}
if (resp == NULL)
return (PAM_TRY_AGAIN);
r = pam_set_item(pamh, item, resp);
free(resp);
if (r != PAM_SUCCESS)
return (r);
return (pam_get_item(pamh, item, (const void **)authtok));
}
/*
* Error codes:
*
* =pam_get_item
* =pam_prompt
* =pam_set_item
* !PAM_SYMBOL_ERR
* PAM_TRY_AGAIN
*/
/**
* The =pam_get_authtok function returns the cached authentication token,
* or prompts the user if no token is currently cached. Either way, a
* pointer to the authentication token is stored in the location pointed
* to by the =authtok argument.
*
* The =item argument must have one of the following values:
*
* =PAM_AUTHTOK
* Returns the current authentication token, or the new token
* when changing authentication tokens.
* =PAM_OLDAUTHTOK
* Returns the previous authentication token when changing
* authentication tokens.
*
* The =prompt argument specifies a prompt to use if no token is cached.
* If it is =NULL, the =PAM_AUTHTOK_PROMPT or =PAM_OLDAUTHTOK_PROMPT item,
* as appropriate, will be used. If that item is also =NULL, a hardcoded
* default prompt will be used.
*
* If =item is set to =PAM_AUTHTOK and there is a non-null =PAM_OLDAUTHTOK
* item, =pam_get_authtok will ask the user to confirm the new token by
* retyping it. If there is a mismatch, =pam_get_authtok will return
* =PAM_TRY_AGAIN.
*
* >pam_get_item
* >pam_get_user
*/
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