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pam_echo.c revision 1.1 
      1 /*-
      2  * Copyright (c) 2001,2003 Networks Associates Technology, Inc.
      3  * All rights reserved.
      4  *
      5  * This software was developed for the FreeBSD Project by ThinkSec AS and
      6  * NAI Labs, the Security Research Division of Network Associates, Inc.
      7  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
      8  * DARPA CHATS research program.
      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. The name of the author may not be used to endorse or promote
     19  *    products derived from this software without specific prior written
     20  *    permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_echo/pam_echo.c,v 1.4 2003/12/11 13:55:15 des Exp $");
     37 
     38 #include <stdio.h>
     39 #include <stdlib.h>
     40 #include <string.h>
     41 
     42 #include <security/pam_appl.h>
     43 #include <security/pam_modules.h>
     44 #include <security/openpam.h>
     45 
     46 static int
     47 _pam_echo(pam_handle_t *pamh, int flags,
     48     int argc, const char *argv[])
     49 {
     50 	char msg[PAM_MAX_MSG_SIZE];
     51 	const void *str;
     52 	const char *p, *q;
     53 	int err, i, item;
     54 	size_t len;
     55 
     56 	if (flags & PAM_SILENT)
     57 		return (PAM_SUCCESS);
     58 	for (i = 0, len = 0; i < argc && len < sizeof(msg) - 1; ++i) {
     59 		if (i > 0)
     60 			msg[len++] = ' ';
     61 		for (p = argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) {
     62 			if (*p != '%' || p[1] == '\0') {
     63 				msg[len++] = *p;
     64 				continue;
     65 			}
     66 			switch (*++p) {
     67 			case 'H':
     68 				item = PAM_RHOST;
     69 				break;
     70 			case 'h':
     71 				/* not implemented */
     72 				item = -1;
     73 				break;
     74 			case 's':
     75 				item = PAM_SERVICE;
     76 				break;
     77 			case 't':
     78 				item = PAM_TTY;
     79 				break;
     80 			case 'U':
     81 				item = PAM_RUSER;
     82 				break;
     83 			case 'u':
     84 				item = PAM_USER;
     85 				break;
     86 			default:
     87 				item = -1;
     88 				msg[len++] = *p;
     89 				break;
     90 			}
     91 			if (item == -1)
     92 				continue;
     93 			err = pam_get_item(pamh, item, &str);
     94 			if (err != PAM_SUCCESS)
     95 				return (err);
     96 			if (str == NULL)
     97 				str = "(null)";
     98 			for (q = str; *q != '\0' && len < sizeof(msg) - 1; ++q)
     99 				msg[len++] = *q;
    100 		}
    101 	}
    102 	msg[len] = '\0';
    103 	return (pam_info(pamh, "%s", msg));
    104 }
    105 
    106 PAM_EXTERN int
    107 pam_sm_authenticate(pam_handle_t *pamh, int flags,
    108     int argc, const char *argv[])
    109 {
    110 
    111 	return (_pam_echo(pamh, flags, argc, argv));
    112 }
    113 
    114 PAM_EXTERN int
    115 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
    116     int argc __unused, const char *argv[] __unused)
    117 {
    118 
    119 	return (PAM_SUCCESS);
    120 }
    121 
    122 PAM_EXTERN int
    123 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
    124     int argc, const char *argv[])
    125 {
    126 
    127 	return (_pam_echo(pamh, flags, argc, argv));
    128 }
    129 
    130 PAM_EXTERN int
    131 pam_sm_open_session(pam_handle_t *pamh, int flags,
    132     int argc, const char *argv[])
    133 {
    134 
    135 	return (_pam_echo(pamh, flags, argc, argv));
    136 }
    137 
    138 PAM_EXTERN int
    139 pam_sm_close_session(pam_handle_t *pamh, int flags,
    140     int argc, const char *argv[])
    141 {
    142 
    143 	return (_pam_echo(pamh, flags, argc, argv));
    144 }
    145 
    146 PAM_EXTERN int
    147 pam_sm_chauthtok(pam_handle_t *pamh, int flags,
    148     int argc, const char *argv[])
    149 {
    150 
    151 	if (flags & PAM_PRELIM_CHECK)
    152 		return (PAM_SUCCESS);
    153 	return (_pam_echo(pamh, flags, argc, argv));
    154 }
    155 
    156 PAM_MODULE_ENTRY("pam_echo");
    157