139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* Please read the file COPYING, README and AUTHORS for more information.
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*/
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#include "portab.h"
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#ifdef PAM
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/**
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* @file
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* PAM User Authentication
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_SECURITY_PAM_APPL_H
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# include <security/pam_appl.h>
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#endif
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#ifdef HAVE_PAM_PAM_APPL_H
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# include <pam/pam_appl.h>
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#endif
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#include "defines.h"
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#include "log.h"
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#include "conn.h"
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#include "client.h"
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#include "conf.h"
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#include "pam.h"
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static char *password;
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/**
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* PAM "conversation function".
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* This is a callback function used by the PAM library to get the password.
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* Please see the PAM documentation for details :-)
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*/
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static int
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password_conversation(int num_msg, const struct pam_message **msg,
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struct pam_response **resp, void *appdata_ptr) {
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LogDebug("PAM: conv(%d, %d, '%s', '%s')",
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num_msg, msg[0]->msg_style, msg[0]->msg, appdata_ptr);
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/* Can we deal with this request? */
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if (num_msg != 1 || msg[0]->msg_style != PAM_PROMPT_ECHO_OFF) {
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Log(LOG_ERR, "PAM: Unexpected PAM conversation '%d:%s'!",
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msg[0]->msg_style, msg[0]->msg);
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return PAM_CONV_ERR;
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}
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if (!appdata_ptr) {
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/* Sometimes appdata_ptr gets lost!? */
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appdata_ptr = password;
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}
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/* Duplicate password ("application data") for the PAM library */
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*resp = calloc(num_msg, sizeof(struct pam_response));
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if (!*resp) {
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Log(LOG_ERR, "PAM: Out of memory!");
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return PAM_CONV_ERR;
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}
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(*resp)[0].resp = strdup((char *)appdata_ptr);
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(*resp)[0].resp_retcode = 0;
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return ((*resp)[0].resp ? PAM_SUCCESS : PAM_CONV_ERR);
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}
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/**
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* PAM "conversation" structure.
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*/
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static struct pam_conv conv = {
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&password_conversation,
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NULL
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};
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/**
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* Authenticate a connecting client using PAM.
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* @param Client The client to authenticate.
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* @return true when authentication succeeded, false otherwise.
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*/
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GLOBAL bool
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PAM_Authenticate(CLIENT *Client) {
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pam_handle_t *pam;
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int retval = PAM_SUCCESS;
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LogDebug("PAM: Authenticate \"%s\" (%s) ...",
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Client_OrigUser(Client), Client_Mask(Client));
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/* Set supplied client password */
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if (password)
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free(password);
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password = strdup(Conn_Password(Client_Conn(Client)));
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conv.appdata_ptr = Conn_Password(Client_Conn(Client));
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/* Initialize PAM */
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retval = pam_start(Conf_PAMServiceName, Client_OrigUser(Client), &conv, &pam);
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if (retval != PAM_SUCCESS) {
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Log(LOG_ERR, "PAM: Failed to create authenticator! (%d)", retval);
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return false;
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}
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pam_set_item(pam, PAM_RUSER, Client_User(Client));
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pam_set_item(pam, PAM_RHOST, Client_Hostname(Client));
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#if defined(HAVE_PAM_FAIL_DELAY) && !defined(NO_PAM_FAIL_DELAY)
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pam_fail_delay(pam, 0);
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#endif
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/* PAM authentication ... */
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retval = pam_authenticate(pam, 0);
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/* Success? */
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if (retval == PAM_SUCCESS)
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Log(LOG_INFO, "PAM: Authenticated \"%s\" (%s).",
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Client_OrigUser(Client), Client_Mask(Client));
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else
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Log(LOG_ERR, "PAM: Error on \"%s\" (%s): %s",
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Client_OrigUser(Client), Client_Mask(Client),
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pam_strerror(pam, retval));
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/* Free PAM structures */
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if (pam_end(pam, retval) != PAM_SUCCESS)
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Log(LOG_ERR, "PAM: Failed to release authenticator!");
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return (retval == PAM_SUCCESS);
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}
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#endif /* PAM */
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/* -eof- */
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