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pam_ftpusers.c revision 1.2 
      1 /*	$NetBSD: pam_ftpusers.c,v 1.2 2004/12/12 08:18:44 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 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_ftpusers/pam_ftpusers.c,v 1.1 2002/05/08 00:30:10 des Exp $");
     40 #else
     41 __RCSID("$NetBSD: pam_ftpusers.c,v 1.2 2004/12/12 08:18:44 christos Exp $");
     42 #endif
     43 
     44 #include <ctype.h>
     45 #include <grp.h>
     46 #include <paths.h>
     47 #include <pwd.h>
     48 #include <stdio.h>
     49 #include <stdlib.h>
     50 #include <string.h>
     51 
     52 #define PAM_SM_ACCOUNT
     53 
     54 #include <security/pam_appl.h>
     55 #include <security/pam_modules.h>
     56 #include <security/pam_mod_misc.h>
     57 #include <security/openpam.h>
     58 
     59 PAM_EXTERN int
     60 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
     61     int argc __unused, const char *argv[] __unused)
     62 {
     63 	struct passwd *pwd;
     64 	struct group *grp;
     65 	const char *user;
     66 	int pam_err, found, allow;
     67 	char *line, *name, **mem;
     68 	size_t len, ulen;
     69 	FILE *f;
     70 
     71 	pam_err = pam_get_user(pamh, &user, NULL);
     72 	if (pam_err != PAM_SUCCESS)
     73 		return (pam_err);
     74 	if (user == NULL || (pwd = getpwnam(user)) == NULL)
     75 		return (PAM_SERVICE_ERR);
     76 
     77 	found = 0;
     78 	ulen = strlen(user);
     79 	if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) {
     80 		PAM_LOG("%s: %m", _PATH_FTPUSERS);
     81 		goto done;
     82 	}
     83 	while (!found && (line = fgetln(f, &len)) != NULL) {
     84 		if (*line == '#')
     85 			continue;
     86 		while (len > 0 && isspace((unsigned char)line[len - 1]))
     87 			--len;
     88 		if (len == 0)
     89 			continue;
     90 		/* simple case first */
     91 		if (*line != '@') {
     92 			if (len == ulen && strncmp(user, line, len) == 0)
     93 				found = 1;
     94 			continue;
     95 		}
     96 		/* member of specified group? */
     97 		asprintf(&name, "%.*s", (int)len - 1, line + 1);
     98 		if (name == NULL) {
     99 			fclose(f);
    100 			return (PAM_BUF_ERR);
    101 		}
    102 		grp = getgrnam(name);
    103 		free(name);
    104 		if (grp == NULL)
    105 			continue;
    106 		for (mem = grp->gr_mem; mem && *mem && !found; ++mem)
    107 			if (strcmp(user, *mem) == 0)
    108 				found = 1;
    109 	}
    110  done:
    111 	allow = (openpam_get_option(pamh, "disallow") == NULL);
    112 	if (found)
    113 		pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR;
    114 	else
    115 		pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS;
    116 	if (f != NULL)
    117 		fclose(f);
    118 	return (pam_err);
    119 }
    120 
    121 PAM_MODULE_ENTRY("pam_ftpusers");
    122