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pam_skey.c revision 1.2 
      1 /*	$NetBSD: pam_skey.c,v 1.2 2005/03/20 16:48:47 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2005 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __RCSID("$NetBSD: pam_skey.c,v 1.2 2005/03/20 16:48:47 christos Exp $");
     41 
     42 #include <sys/types.h>
     43 #include <string.h>
     44 #include <stdio.h>
     45 #include <stdlib.h>
     46 #include <unistd.h>
     47 
     48 #include <skey.h>
     49 
     50 #define	PAM_SM_AUTH
     51 
     52 #include <security/pam_appl.h>
     53 #include <security/pam_modules.h>
     54 #include <security/pam_mod_misc.h>
     55 
     56 /*
     57  * authentication management
     58  */
     59 PAM_EXTERN int
     60 /*ARGSUSED*/
     61 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
     62     int argc __unused, const char *argv[] __unused)
     63 {
     64 	const char *user, *skinfo, *pass;
     65 	char *response;
     66 	int retval;
     67 	char skprompt[80];
     68 
     69 	if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF)) {
     70 		user = getlogin();
     71 	} else {
     72 		retval = pam_get_user(pamh, &user, NULL);
     73 		if (retval != PAM_SUCCESS)
     74 			return (retval);
     75 		PAM_LOG("Got user: %s", user);
     76 	}
     77 
     78 	if (skey_haskey(user) != 0)
     79 		return (PAM_SERVICE_ERR);	/* XXX PAM_AUTHINFO_UNAVAIL? */
     80 
     81 	skinfo = skey_keyinfo(user);
     82 	if (skinfo == NULL) {
     83 		PAM_VERBOSE_ERROR("Error getting S/Key challenge");
     84 		return (PAM_SERVICE_ERR);
     85 	}
     86 
     87 	(void) snprintf(skprompt, sizeof(skprompt),
     88 	    "Password [ %s ]:", skinfo);
     89 
     90 	retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, skprompt);
     91 	if (retval != PAM_SUCCESS)
     92 		return (retval);
     93 
     94 	response = strdup(pass);
     95 	if (response == NULL) {
     96 		pam_error(pamh, "Unable to copy S/Key response");
     97 		return (PAM_SERVICE_ERR);
     98 	}
     99 
    100 	retval = skey_passcheck(user, response) == -1 ?
    101 	    PAM_AUTH_ERR : PAM_SUCCESS;
    102 
    103 	free(response);
    104 
    105 	return (retval);
    106 }
    107 
    108 PAM_EXTERN int
    109 /*ARGSUSED*/
    110 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
    111     int argc __unused, const char *argv[] __unused)
    112 {
    113 
    114 	return (PAM_SUCCESS);
    115 }
    116 
    117 PAM_MODULE_ENTRY("pam_skey");
    118