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pam_ftpusers.c revision 1.1 
      1 /*-
      2  * Copyright (c) 2001 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_ftpusers/pam_ftpusers.c,v 1.1 2002/05/08 00:30:10 des Exp $");
     37 
     38 #include <ctype.h>
     39 #include <grp.h>
     40 #include <paths.h>
     41 #include <pwd.h>
     42 #include <stdio.h>
     43 #include <stdlib.h>
     44 #include <string.h>
     45 
     46 #define PAM_SM_ACCOUNT
     47 
     48 #include <security/pam_appl.h>
     49 #include <security/pam_modules.h>
     50 #include <security/pam_mod_misc.h>
     51 #include <security/openpam.h>
     52 
     53 PAM_EXTERN int
     54 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
     55     int argc __unused, const char *argv[] __unused)
     56 {
     57 	struct passwd *pwd;
     58 	struct group *grp;
     59 	const char *user;
     60 	int pam_err, found, allow;
     61 	char *line, *name, **mem;
     62 	size_t len, ulen;
     63 	FILE *f;
     64 
     65 	pam_err = pam_get_user(pamh, &user, NULL);
     66 	if (pam_err != PAM_SUCCESS)
     67 		return (pam_err);
     68 	if (user == NULL || (pwd = getpwnam(user)) == NULL)
     69 		return (PAM_SERVICE_ERR);
     70 
     71 	found = 0;
     72 	ulen = strlen(user);
     73 	if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) {
     74 		PAM_LOG("%s: %m", _PATH_FTPUSERS);
     75 		goto done;
     76 	}
     77 	while (!found && (line = fgetln(f, &len)) != NULL) {
     78 		if (*line == '#')
     79 			continue;
     80 		while (len > 0 && isspace(line[len - 1]))
     81 			--len;
     82 		if (len == 0)
     83 			continue;
     84 		/* simple case first */
     85 		if (*line != '@') {
     86 			if (len == ulen && strncmp(user, line, len) == 0)
     87 				found = 1;
     88 			continue;
     89 		}
     90 		/* member of specified group? */
     91 		asprintf(&name, "%.*s", (int)len - 1, line + 1);
     92 		if (name == NULL) {
     93 			fclose(f);
     94 			return (PAM_BUF_ERR);
     95 		}
     96 		grp = getgrnam(name);
     97 		free(name);
     98 		if (grp == NULL)
     99 			continue;
    100 		for (mem = grp->gr_mem; mem && *mem && !found; ++mem)
    101 			if (strcmp(user, *mem) == 0)
    102 				found = 1;
    103 	}
    104  done:
    105 	allow = (openpam_get_option(pamh, "disallow") == NULL);
    106 	if (found)
    107 		pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR;
    108 	else
    109 		pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS;
    110 	if (f != NULL)
    111 		fclose(f);
    112 	return (pam_err);
    113 }
    114 
    115 PAM_MODULE_ENTRY("pam_ftpusers");
    116