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      1 /*	$NetBSD: pam_echo.c,v 1.2 2004/12/12 08:18:44 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001,2003 Networks Associates Technology, Inc.
      5  * All rights reserved.
      6  *
      7  * This software was developed for the FreeBSD Project by ThinkSec AS and
      8  * NAI Labs, the Security Research Division of Network Associates, Inc.
      9  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
     10  * DARPA CHATS research program.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. The name of the author may not be used to endorse or promote
     21  *    products derived from this software without specific prior written
     22  *    permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 #ifdef __FreeBSD__
     39 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_echo/pam_echo.c,v 1.4 2003/12/11 13:55:15 des Exp $");
     40 #else
     41 __RCSID("$NetBSD: pam_echo.c,v 1.2 2004/12/12 08:18:44 christos Exp $");
     42 #endif
     43 
     44 #include <stdio.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 
     48 #include <security/pam_appl.h>
     49 #include <security/pam_modules.h>
     50 #include <security/openpam.h>
     51 
     52 static int
     53 _pam_echo(pam_handle_t *pamh, int flags,
     54     int argc, const char *argv[])
     55 {
     56 	char msg[PAM_MAX_MSG_SIZE];
     57 	const void *str;
     58 	const char *p, *q;
     59 	int err, i, item;
     60 	size_t len;
     61 
     62 	if (flags & PAM_SILENT)
     63 		return (PAM_SUCCESS);
     64 	for (i = 0, len = 0; i < argc && len < sizeof(msg) - 1; ++i) {
     65 		if (i > 0)
     66 			msg[len++] = ' ';
     67 		for (p = argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) {
     68 			if (*p != '%' || p[1] == '\0') {
     69 				msg[len++] = *p;
     70 				continue;
     71 			}
     72 			switch (*++p) {
     73 			case 'H':
     74 				item = PAM_RHOST;
     75 				break;
     76 			case 'h':
     77 				/* not implemented */
     78 				item = -1;
     79 				break;
     80 			case 's':
     81 				item = PAM_SERVICE;
     82 				break;
     83 			case 't':
     84 				item = PAM_TTY;
     85 				break;
     86 			case 'U':
     87 				item = PAM_RUSER;
     88 				break;
     89 			case 'u':
     90 				item = PAM_USER;
     91 				break;
     92 			default:
     93 				item = -1;
     94 				msg[len++] = *p;
     95 				break;
     96 			}
     97 			if (item == -1)
     98 				continue;
     99 			err = pam_get_item(pamh, item, &str);
    100 			if (err != PAM_SUCCESS)
    101 				return (err);
    102 			if (str == NULL)
    103 				str = "(null)";
    104 			for (q = str; *q != '\0' && len < sizeof(msg) - 1; ++q)
    105 				msg[len++] = *q;
    106 		}
    107 	}
    108 	msg[len] = '\0';
    109 	return (pam_info(pamh, "%s", msg));
    110 }
    111 
    112 PAM_EXTERN int
    113 pam_sm_authenticate(pam_handle_t *pamh, int flags,
    114     int argc, const char *argv[])
    115 {
    116 
    117 	return (_pam_echo(pamh, flags, argc, argv));
    118 }
    119 
    120 PAM_EXTERN int
    121 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
    122     int argc __unused, const char *argv[] __unused)
    123 {
    124 
    125 	return (PAM_SUCCESS);
    126 }
    127 
    128 PAM_EXTERN int
    129 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
    130     int argc, const char *argv[])
    131 {
    132 
    133 	return (_pam_echo(pamh, flags, argc, argv));
    134 }
    135 
    136 PAM_EXTERN int
    137 pam_sm_open_session(pam_handle_t *pamh, int flags,
    138     int argc, const char *argv[])
    139 {
    140 
    141 	return (_pam_echo(pamh, flags, argc, argv));
    142 }
    143 
    144 PAM_EXTERN int
    145 pam_sm_close_session(pam_handle_t *pamh, int flags,
    146     int argc, const char *argv[])
    147 {
    148 
    149 	return (_pam_echo(pamh, flags, argc, argv));
    150 }
    151 
    152 PAM_EXTERN int
    153 pam_sm_chauthtok(pam_handle_t *pamh, int flags,
    154     int argc, const char *argv[])
    155 {
    156 
    157 	if (flags & PAM_PRELIM_CHECK)
    158 		return (PAM_SUCCESS);
    159 	return (_pam_echo(pamh, flags, argc, argv));
    160 }
    161 
    162 PAM_MODULE_ENTRY("pam_echo");
    163