206 lines
6.6 KiB
C
206 lines
6.6 KiB
C
/*-
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* Copyright (c) 2002-2003 Networks Associates Technology, Inc.
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* Copyright (c) 2004-2011 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by ThinkSec AS and
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* Network Associates Laboratories, the Security Research Division of
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* Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: pam_get_authtok.c 510 2011-12-31 13:14:23Z des $
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <sys/param.h>
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#include <stdlib.h>
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#include <string.h>
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#include <security/pam_appl.h>
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#include <security/openpam.h>
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#include "openpam_impl.h"
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static const char authtok_prompt[] = "Password:";
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static const char authtok_prompt_remote[] = "Password for %u@%h:";
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static const char oldauthtok_prompt[] = "Old Password:";
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static const char newauthtok_prompt[] = "New Password:";
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/*
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* OpenPAM extension
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*
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* Retrieve authentication token
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*/
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int
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pam_get_authtok(pam_handle_t *pamh,
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int item,
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const char **authtok,
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const char *prompt)
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{
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char prompt_buf[1024];
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size_t prompt_size;
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const void *oldauthtok, *prevauthtok, *promptp;
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const char *prompt_option, *default_prompt;
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const void *lhost, *rhost;
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char *resp, *resp2;
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int pitem, r, style, twice;
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ENTER();
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if (pamh == NULL || authtok == NULL)
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RETURNC(PAM_SYSTEM_ERR);
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*authtok = NULL;
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twice = 0;
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switch (item) {
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case PAM_AUTHTOK:
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pitem = PAM_AUTHTOK_PROMPT;
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prompt_option = "authtok_prompt";
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default_prompt = authtok_prompt;
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r = pam_get_item(pamh, PAM_RHOST, &rhost);
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if (r == PAM_SUCCESS && rhost != NULL) {
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r = pam_get_item(pamh, PAM_HOST, &lhost);
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if (r == PAM_SUCCESS && lhost != NULL) {
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if (strcmp(rhost, lhost) != 0)
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default_prompt = authtok_prompt_remote;
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}
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}
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r = pam_get_item(pamh, PAM_OLDAUTHTOK, &oldauthtok);
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if (r == PAM_SUCCESS && oldauthtok != NULL) {
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default_prompt = newauthtok_prompt;
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twice = 1;
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}
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break;
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case PAM_OLDAUTHTOK:
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pitem = PAM_OLDAUTHTOK_PROMPT;
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prompt_option = "oldauthtok_prompt";
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default_prompt = oldauthtok_prompt;
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twice = 0;
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break;
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default:
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RETURNC(PAM_SYMBOL_ERR);
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}
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if (openpam_get_option(pamh, "try_first_pass") ||
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openpam_get_option(pamh, "use_first_pass")) {
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r = pam_get_item(pamh, item, &prevauthtok);
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if (r == PAM_SUCCESS && prevauthtok != NULL) {
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*authtok = prevauthtok;
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RETURNC(PAM_SUCCESS);
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}
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else if (openpam_get_option(pamh, "use_first_pass"))
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RETURNC(r == PAM_SUCCESS ? PAM_AUTH_ERR : r);
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}
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/* pam policy overrides the module's choice */
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if ((promptp = openpam_get_option(pamh, prompt_option)) != NULL)
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prompt = promptp;
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/* no prompt provided, see if there is one tucked away somewhere */
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if (prompt == NULL)
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if (pam_get_item(pamh, pitem, &promptp) && promptp != NULL)
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prompt = promptp;
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/* fall back to hardcoded default */
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if (prompt == NULL)
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prompt = default_prompt;
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/* expand */
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prompt_size = sizeof prompt_buf;
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r = openpam_subst(pamh, prompt_buf, &prompt_size, prompt);
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if (r == PAM_SUCCESS && prompt_size <= sizeof prompt_buf)
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prompt = prompt_buf;
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style = openpam_get_option(pamh, "echo_pass") ?
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PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF;
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r = pam_prompt(pamh, style, &resp, "%s", prompt);
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if (r != PAM_SUCCESS)
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RETURNC(r);
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if (twice) {
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r = pam_prompt(pamh, style, &resp2, "Retype %s", prompt);
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if (r != PAM_SUCCESS) {
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FREE(resp);
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RETURNC(r);
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}
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if (strcmp(resp, resp2) != 0)
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FREE(resp);
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FREE(resp2);
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}
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if (resp == NULL)
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RETURNC(PAM_TRY_AGAIN);
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r = pam_set_item(pamh, item, resp);
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FREE(resp);
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if (r != PAM_SUCCESS)
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RETURNC(r);
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r = pam_get_item(pamh, item, (const void **)authtok);
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RETURNC(r);
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}
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/*
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* Error codes:
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*
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* =pam_get_item
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* =pam_prompt
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* =pam_set_item
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* !PAM_SYMBOL_ERR
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* PAM_TRY_AGAIN
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*/
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/**
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* The =pam_get_authtok function returns the cached authentication token,
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* or prompts the user if no token is currently cached.
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* Either way, a pointer to the authentication token is stored in the
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* location pointed to by the =authtok argument.
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*
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* The =item argument must have one of the following values:
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*
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* =PAM_AUTHTOK:
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* Returns the current authentication token, or the new token
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* when changing authentication tokens.
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* =PAM_OLDAUTHTOK:
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* Returns the previous authentication token when changing
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* authentication tokens.
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*
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* The =prompt argument specifies a prompt to use if no token is cached.
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* If it is =NULL, the =PAM_AUTHTOK_PROMPT or =PAM_OLDAUTHTOK_PROMPT item,
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* as appropriate, will be used.
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* If that item is also =NULL, a hardcoded default prompt will be used.
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* Either way, the prompt is expanded using =openpam_subst before it is
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* passed to the conversation function.
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*
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* If =pam_get_authtok is called from a module and the ;authtok_prompt /
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* ;oldauthtok_prompt option is set in the policy file, the value of that
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* option takes precedence over both the =prompt argument and the
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* =PAM_AUTHTOK_PROMPT / =PAM_OLDAUTHTOK_PROMPT item.
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*
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* If =item is set to =PAM_AUTHTOK and there is a non-null =PAM_OLDAUTHTOK
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* item, =pam_get_authtok will ask the user to confirm the new token by
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* retyping it.
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* If there is a mismatch, =pam_get_authtok will return =PAM_TRY_AGAIN.
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*
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* >pam_get_item
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* >pam_get_user
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* >openpam_subst
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*/
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