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/* ========================================================================
* Copyright 1988-2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: Pluggable Authentication Modules login services
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 1 August 1988
* Last Edited: 31 August 2006
*/
#ifdef MAC_OSX_KLUDGE /* why can't Apple be compatible? */
#include <pam/pam_appl.h>
#else
#include <security/pam_appl.h>
#endif
struct checkpw_cred {
char *uname; /* user name */
char *pass; /* password */
};
/* PAM conversation function
* Accepts: number of messages
* vector of messages
* pointer to response return
* application data
* Returns: PAM_SUCCESS if OK, response vector filled in, else PAM_CONV_ERR
*/
static int checkpw_conv (int num_msg,const struct pam_message **msg,
struct pam_response **resp,void *appdata_ptr)
{
int i;
struct checkpw_cred *cred = (struct checkpw_cred *) appdata_ptr;
struct pam_response *reply = fs_get (sizeof (struct pam_response) * num_msg);
for (i = 0; i < num_msg; i++) switch (msg[i]->msg_style) {
case PAM_PROMPT_ECHO_ON: /* assume want user name */
reply[i].resp_retcode = PAM_SUCCESS;
reply[i].resp = cpystr (cred->uname);
break;
case PAM_PROMPT_ECHO_OFF: /* assume want password */
reply[i].resp_retcode = PAM_SUCCESS;
reply[i].resp = cpystr (cred->pass);
break;
case PAM_TEXT_INFO:
case PAM_ERROR_MSG:
reply[i].resp_retcode = PAM_SUCCESS;
reply[i].resp = NULL;
break;
default: /* unknown message style */
fs_give ((void **) &reply);
return PAM_CONV_ERR;
}
*resp = reply;
return PAM_SUCCESS;
}
/* PAM cleanup
* Accepts: handle
*/
static void checkpw_cleanup (pam_handle_t *hdl)
{
#if 0 /* see checkpw() for why this is #if 0 */
pam_close_session (hdl,NIL); /* close session [uw]tmp */
#endif
pam_setcred (hdl,PAM_DELETE_CRED);
pam_end (hdl,PAM_SUCCESS);
}
/* Server log in
* Accepts: user name string
* password string
* Returns: T if password validated, NIL otherwise
*/
struct passwd *checkpw (struct passwd *pw,char *pass,int argc,char *argv[])
{
pam_handle_t *hdl;
struct pam_conv conv;
struct checkpw_cred cred;
char *name = cpystr (pw->pw_name);
conv.conv = &checkpw_conv;
conv.appdata_ptr = &cred;
cred.uname = name;
cred.pass = pass;
if ((pw = ((pam_start ((char *) mail_parameters (NIL,GET_SERVICENAME,NIL),
pw->pw_name,&conv,&hdl) == PAM_SUCCESS) &&
(pam_set_item (hdl,PAM_RHOST,tcp_clientaddr ()) == PAM_SUCCESS) &&
(pam_authenticate (hdl,NIL) == PAM_SUCCESS) &&
(pam_acct_mgmt (hdl,NIL) == PAM_SUCCESS) &&
(pam_setcred (hdl,PAM_ESTABLISH_CRED) == PAM_SUCCESS)) ?
getpwnam (name) : NIL) != NULL) {
#if 0
/*
* Some people have reported that this causes a SEGV in strncpy() from
* pam_unix.so.1
*/
/*
* This pam_open_session() call is inconsistant with how we handle other
* platforms, where we don't write [uw]tmp records. However, unlike our
* code on other platforms, pam_acct_mgmt() will check those records for
* inactivity and deny the authentication.
*/
pam_open_session (hdl,NIL); /* make sure account doesn't go inactive */
#endif
/* arm hook to delete credentials */
mail_parameters (NIL,SET_LOGOUTHOOK,(void *) checkpw_cleanup);
mail_parameters (NIL,SET_LOGOUTDATA,(void *) hdl);
}
else checkpw_cleanup (hdl); /* clean up */
fs_give ((void **) &name);
/* reset log facility in case PAM broke it */
if (myServerName) openlog (myServerName,LOG_PID,syslog_facility);
return pw;
}
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