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/*
* Copyright (C) 1998 Caldera, Inc.
* Copyright (C) 2003 Oswald Buddenhagen <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "kcheckpass.h"
#ifdef HAVE_PAM
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#ifdef HAVE_PAM_PAM_APPL_H
#include <pam/pam_appl.h>
#else
#include <security/pam_appl.h>
#endif
struct pam_data {
char *(*conv) (ConvRequest, const char *);
int abort:1;
int classic:1;
};
#ifdef PAM_MESSAGE_NONCONST
typedef struct pam_message pam_message_type;
typedef void *pam_gi_type;
#else
typedef const struct pam_message pam_message_type;
typedef const void *pam_gi_type;
#endif
static int
PAM_conv (int num_msg, pam_message_type **msg,
struct pam_response **resp,
void *appdata_ptr)
{
int count;
struct pam_response *repl;
struct pam_data *pd = (struct pam_data *)appdata_ptr;
if (!(repl = calloc(num_msg, sizeof(struct pam_response))))
return PAM_CONV_ERR;
for (count = 0; count < num_msg; count++)
switch (msg[count]->msg_style) {
case PAM_TEXT_INFO:
pd->conv(ConvPutInfo, msg[count]->msg);
break;
case PAM_ERROR_MSG:
pd->conv(ConvPutError, msg[count]->msg);
break;
default:
switch (msg[count]->msg_style) {
case PAM_PROMPT_ECHO_ON:
repl[count].resp = pd->conv(ConvGetNormal, msg[count]->msg);
break;
case PAM_PROMPT_ECHO_OFF:
if (pd->classic) {
// WARNING
// This is far from foolproof, but it's the best we can do at this time...
// Try to detect PIN entry requests
if (strstr(msg[count]->msg, "PIN")) {
repl[count].resp = pd->conv(ConvGetHidden, msg[count]->msg);
}
else {
repl[count].resp = pd->conv(ConvGetHidden, 0);
}
}
else {
repl[count].resp = pd->conv(ConvGetHidden, msg[count]->msg);
}
break;
#ifdef PAM_BINARY_PROMPT
case PAM_BINARY_PROMPT:
repl[count].resp = pd->conv(ConvGetBinary, msg[count]->msg);
break;
#endif
default:
/* Must be an error of some sort... */
goto conv_err;
}
if (!repl[count].resp) {
pd->abort = 1;
goto conv_err;
}
repl[count].resp_retcode = PAM_SUCCESS;
break;
}
*resp = repl;
return PAM_SUCCESS;
conv_err:
for (; count >= 0; count--)
if (repl[count].resp)
switch (msg[count]->msg_style) {
case PAM_PROMPT_ECHO_OFF:
dispose(repl[count].resp);
break;
#ifdef PAM_BINARY_PROMPT
case PAM_BINARY_PROMPT: /* handle differently? */
#endif
case PAM_PROMPT_ECHO_ON:
free(repl[count].resp);
break;
}
free(repl);
return PAM_CONV_ERR;
}
static struct pam_data PAM_data;
static struct pam_conv PAM_conversation = {
&PAM_conv,
&PAM_data
};
#ifdef PAM_FAIL_DELAY
static void
fail_delay(int retval ATTR_UNUSED, unsigned usec_delay ATTR_UNUSED,
void *appdata_ptr ATTR_UNUSED)
{}
#endif
AuthReturn Authenticate(const char *caller, const char *method,
const char *user, char *(*conv) (ConvRequest, const char *))
{
const char *tty;
pam_handle_t *pamh;
pam_gi_type pam_item;
const char *pam_service;
char pservb[64];
int pam_error;
openlog("kcheckpass", LOG_PID, LOG_AUTH);
PAM_data.conv = conv;
if (!strcmp(method, "classic")) {
PAM_data.classic = 1;
pam_service = caller;
}
else if (!strcmp(method, "pam")) {
pam_service = caller;
} else {
sprintf(pservb, "%.31s-%.31s", caller, method);
pam_service = pservb;
}
pam_error = pam_start(pam_service, user, &PAM_conversation, &pamh);
if (pam_error != PAM_SUCCESS)
return AuthError;
tty = ttyname(0);
if (!tty)
tty = getenv ("DISPLAY");
pam_error = pam_set_item (pamh, PAM_TTY, tty);
if (pam_error != PAM_SUCCESS) {
pam_end(pamh, pam_error);
return AuthError;
}
# ifdef PAM_FAIL_DELAY
pam_set_item (pamh, PAM_FAIL_DELAY, (void *)fail_delay);
# endif
pam_error = pam_authenticate(pamh, 0);
if (pam_error != PAM_SUCCESS) {
pam_end(pamh, pam_error);
switch (pam_error) {
case PAM_USER_UNKNOWN:
case PAM_AUTH_ERR:
case PAM_MAXTRIES: /* should handle this better ... */
case PAM_AUTHINFO_UNAVAIL: /* returned for unknown users ... bogus */
return AuthBad;
case PAM_SERVICE_ERR:
return AuthError;
default:
return AuthError;
}
}
/* just in case some module is stupid enough to ignore a preset PAM_USER */
pam_error = pam_get_item (pamh, PAM_USER, &pam_item);
if (pam_error != PAM_SUCCESS) {
pam_end(pamh, pam_error);
return AuthError;
}
if (strcmp((const char *)pam_item, user)) {
pam_end(pamh, PAM_SUCCESS); /* maybe use PAM_AUTH_ERR? */
return AuthBad;
}
pam_error = pam_setcred(pamh, PAM_REFRESH_CRED);
/* ignore errors on refresh credentials. If this did not work we use the old once. */
pam_end(pamh, PAM_SUCCESS);
return AuthOk;
}
#endif
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