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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 "pam_private.h"
#include <security/pam_ext.h>
#define PROMPT _("Password: ")
/* For Translators: "%s" is replaced with "<service>". */
#define PROMPT_CURRENT_ARG _("Current %s password: ")
#define PROMPT_CURRENT_NOARG _("Current password: ")
/* For Translators: "%s" is replaced with "<service>". */
#define PROMPT_NEW_ARG _("New %s password: ")
#define PROMPT_NEW_NOARG _("New password: ")
/* For Translators: "%s" is replaced with "<service>". */
#define PROMPT_RETYPE_ARG _("Retype new %s password: ")
#define PROMPT_RETYPE_NOARG _("Retype new password: ")
#define MISTYPED_PASS _("Sorry, passwords do not match.")
#define PAM_GETAUTHTOK_NOVERIFY 1
static const char *
get_option (pam_handle_t *pamh, const char *option)
{
int i;
size_t len;
if (option == NULL || pamh == NULL ||
pamh->mod_argc == 0 || pamh->mod_argv == NULL)
return NULL;
len = strlen (option);
for (i = 0; i < pamh->mod_argc; i++)
{
if (strncmp (option, pamh->mod_argv[i], len) == 0)
{
if (pamh->mod_argv[i][len] == '=')
return &(pamh->mod_argv[i][len+1]);
else if (pamh->mod_argv[i][len] == '\0')
return "";
}
}
return NULL;
}
static int
pam_get_authtok_internal (pam_handle_t *pamh, int item,
const char **authtok, const char *prompt,
unsigned int flags)
{
char *resp[2] = {NULL, NULL};
const void *prevauthtok;
const char *authtok_type = "";
int chpass = 0; /* Password change, ask twice for it */
int retval;
if (authtok == NULL)
return PAM_SYSTEM_ERR;
/* PAM_AUTHTOK in password stack returns new password,
which needs to be verified. */
if (pamh->choice == PAM_CHAUTHTOK)
{
if (item == PAM_AUTHTOK)
{
chpass = 1;
if (!(flags & PAM_GETAUTHTOK_NOVERIFY))
++chpass;
}
authtok_type = get_option (pamh, "authtok_type");
if (authtok_type == NULL)
{
retval = pam_get_item (pamh, PAM_AUTHTOK_TYPE, (const void **)&authtok_type);
if (retval != PAM_SUCCESS || authtok_type == NULL)
authtok_type = "";
}
else
pam_set_item(pamh, PAM_AUTHTOK_TYPE, authtok_type);
}
retval = pam_get_item (pamh, item, &prevauthtok);
if (retval == PAM_SUCCESS && prevauthtok != NULL)
{
*authtok = prevauthtok;
return PAM_SUCCESS;
}
else if (get_option (pamh, "use_first_pass") ||
(chpass && get_option (pamh, "use_authtok")))
{
if (prevauthtok == NULL)
{
if (chpass)
return PAM_AUTHTOK_ERR;
else
return PAM_AUTH_ERR;
}
else
return retval;
}
if (prompt != NULL)
{
retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0],
"%s", prompt);
if (retval == PAM_SUCCESS && chpass > 1 && resp[0] != NULL)
retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[1],
_("Retype %s"), prompt);
}
else if (chpass)
{
pamh->authtok_verified = 0;
retval = *authtok_type ?
pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0],
PROMPT_NEW_ARG, authtok_type) :
pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0],
"%s", PROMPT_NEW_NOARG);
if (retval == PAM_SUCCESS && chpass > 1 && resp[0] != NULL)
{
retval = *authtok_type ?
pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[1],
PROMPT_RETYPE_ARG, authtok_type) :
pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[1],
"%s", PROMPT_RETYPE_NOARG);
}
}
else if (item == PAM_OLDAUTHTOK)
{
retval = *authtok_type ?
pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0],
PROMPT_CURRENT_ARG, authtok_type) :
pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0],
"%s", PROMPT_CURRENT_NOARG);
}
else
retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0], "%s", PROMPT);
if (retval != PAM_SUCCESS || resp[0] == NULL ||
(chpass > 1 && resp[1] == NULL))
{
/* We want to abort */
if (chpass)
pam_error (pamh, _("Password change has been aborted."));
return PAM_AUTHTOK_ERR;
}
if (chpass > 1 && strcmp (resp[0], resp[1]) != 0)
{
pam_error (pamh, MISTYPED_PASS);
_pam_overwrite (resp[0]);
_pam_drop (resp[0]);
_pam_overwrite (resp[1]);
_pam_drop (resp[1]);
return PAM_TRY_AGAIN;
}
_pam_overwrite (resp[1]);
_pam_drop (resp[1]);
retval = pam_set_item (pamh, item, resp[0]);
_pam_overwrite (resp[0]);
_pam_drop (resp[0]);
if (retval != PAM_SUCCESS)
return retval;
if (chpass > 1)
pamh->authtok_verified = 1;
return pam_get_item(pamh, item, (const void **)authtok);
}
int
pam_get_authtok (pam_handle_t *pamh, int item, const char **authtok,
const char *prompt)
{
return pam_get_authtok_internal (pamh, item, authtok, prompt, 0);
}
int
pam_get_authtok_noverify (pam_handle_t *pamh, const char **authtok,
const char *prompt)
{
return pam_get_authtok_internal (pamh, PAM_AUTHTOK, authtok, prompt,
PAM_GETAUTHTOK_NOVERIFY);
}
int
pam_get_authtok_verify (pam_handle_t *pamh, const char **authtok,
const char *prompt)
{
char *resp = NULL;
const char *authtok_type = "";
int retval;
if (authtok == NULL || pamh->choice != PAM_CHAUTHTOK)
return PAM_SYSTEM_ERR;
if (pamh->authtok_verified)
return pam_get_item (pamh, PAM_AUTHTOK, (const void **)authtok);
if (prompt != NULL)
{
retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp,
_("Retype %s"), prompt);
}
else
{
retval = pam_get_item (pamh, PAM_AUTHTOK_TYPE, (const void **)&authtok_type);
if (retval != PAM_SUCCESS || authtok_type == NULL)
authtok_type = "";
retval = *authtok_type ?
pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp,
PROMPT_RETYPE_ARG, authtok_type) :
pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp,
"%s", PROMPT_RETYPE_NOARG);
}
if (retval != PAM_SUCCESS || resp == NULL)
{
/* We want to abort the password change */
pam_set_item (pamh, PAM_AUTHTOK, NULL);
pam_error (pamh, _("Password change has been aborted."));
return PAM_AUTHTOK_ERR;
}
if (strcmp (*authtok, resp) != 0)
{
pam_set_item (pamh, PAM_AUTHTOK, NULL);
pam_error (pamh, MISTYPED_PASS);
_pam_overwrite (resp);
_pam_drop (resp);
return PAM_TRY_AGAIN;
}
retval = pam_set_item (pamh, PAM_AUTHTOK, resp);
_pam_overwrite (resp);
_pam_drop (resp);
if (retval != PAM_SUCCESS)
return retval;
pamh->authtok_verified = 1;
return pam_get_item(pamh, PAM_AUTHTOK, (const void **)authtok);
}
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