diff options
Diffstat (limited to 'modules/pam_pwdb/pwdb_chkpwd.c')
| -rw-r--r-- | modules/pam_pwdb/pwdb_chkpwd.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/modules/pam_pwdb/pwdb_chkpwd.c b/modules/pam_pwdb/pwdb_chkpwd.c deleted file mode 100644 index e4fe38f8..00000000 --- a/modules/pam_pwdb/pwdb_chkpwd.c +++ /dev/null @@ -1,221 +0,0 @@ -/* - * $Id$ - * - * This program is designed to run setuid(root) or with sufficient - * privilege to read all of the unix password databases. It is designed - * to provide a mechanism for the current user (defined by this - * process' real uid) to verify their own password. - * - * The password is read from the standard input. The exit status of - * this program indicates whether the user is authenticated or not. - * - * Copyright information is located at the end of the file. - * - */ - -#include <security/_pam_aconf.h> - -#ifdef MEMORY_DEBUG -# undef exit -# undef strdup -# undef free -#endif /* MEMORY_DEBUG */ - -#include <stdarg.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <syslog.h> -#include <unistd.h> - -#include <security/_pam_macros.h> - -#define MAXPASS 200 /* the maximum length of a password */ - -#define UNIX_PASSED (PWDB_SUCCESS) -#define UNIX_FAILED (PWDB_SUCCESS+1) - -#include <pwdb/pwdb_public.h> - -/* syslogging function for errors and other information */ - -static void _log_err(int err, const char *format, ...) -{ - va_list args; - - va_start(args, format); - openlog("pwdb_chkpwd", LOG_CONS|LOG_PID, LOG_AUTH); - vsyslog(err, format, args); - va_end(args); - closelog(); -} - -#define PWDB_NO_MD_COMPAT -#include "pam_unix_md.-c" - -static int _unix_verify_passwd(const char *salt, const char *p) -{ - char *pp=NULL; - int retval; - - if (p == NULL) { - if (*salt == '\0') { - retval = UNIX_PASSED; - } else { - retval = UNIX_FAILED; - } - } else { - pp = _pam_md(p, salt); - p = NULL; /* no longer needed here */ - - if ( strcmp( pp, salt ) == 0 ) { - retval = UNIX_PASSED; - } else { - retval = UNIX_FAILED; - } - } - - /* clean up */ - { - char *tp = pp; - if (pp != NULL) { - while(tp && *tp) - *tp++ = '\0'; - free(pp); - pp = tp = NULL; - } - } - - return retval; -} - -int main(int argc, char **argv) -{ - const struct pwdb *pw=NULL; - const struct pwdb_entry *pwe=NULL; - char pass[MAXPASS+1]; - int npass, force_failure=0; - int retval=UNIX_FAILED; - - /* - * we establish that this program is running with non-tty stdin. - * this is to discourage casual use. It does *NOT* prevent an - * intruder from repeatadly running this program to determine the - * password of the current user (brute force attack, but one for - * which the attacker must already have gained access to the user's - * account). - */ - - if ( isatty(STDIN_FILENO) ) { - _log_err(LOG_NOTICE - , "inappropriate use of PWDB helper binary [UID=%d]" - , getuid() ); - fprintf(stderr, - "This program is not designed for running in this way\n" - "-- the system administrator has been informed\n"); - exit(UNIX_FAILED); - } - - /* - * determine the current user's name: - */ - - retval = pwdb_start(); - if (retval != PWDB_SUCCESS) { - _log_err(LOG_ALERT, "failed to open pwdb"); - retval = UNIX_FAILED; - } - if (retval != UNIX_FAILED) { - retval = pwdb_locate("user", PWDB_DEFAULT, PWDB_NAME_UNKNOWN, - getuid(), &pw); - } - if (retval != PWDB_SUCCESS) { - _log_err(LOG_ALERT, "could not identify user"); - while (pwdb_end() != PWDB_SUCCESS); - exit(UNIX_FAILED); - } - if (argc == 2) { - if (pwdb_get_entry(pw, "user", &pwe) == PWDB_SUCCESS) { - if (pwe == NULL) { - force_failure = 1; - } else { - if (strcmp((const char *) pwe->value, argv[1])) { - force_failure = 1; - } - pwdb_entry_delete(&pwe); - } - } - } - - /* read the password from stdin (a pipe from the pam_pwdb module) */ - - npass = read(STDIN_FILENO, pass, MAXPASS); - - if (npass < 0) { /* is it a valid password? */ - _log_err(LOG_DEBUG, "no password supplied"); - retval = UNIX_FAILED; - } else if (npass >= MAXPASS-1) { - _log_err(LOG_DEBUG, "password too long"); - retval = UNIX_FAILED; - } else if (pwdb_get_entry(pw, "passwd", &pwe) != PWDB_SUCCESS) { - _log_err(LOG_WARNING, "password not found"); - retval = UNIX_FAILED; - } else { - if (npass <= 0) { - /* the password is NULL */ - - retval = _unix_verify_passwd((const char *)(pwe->value), NULL); - } else { - /* does pass agree with the official one? */ - - pass[npass] = '\0'; /* NUL terminate */ - retval = _unix_verify_passwd((const char *)(pwe->value), pass); - } - } - - memset(pass, '\0', MAXPASS); /* clear memory of the password */ - while (pwdb_end() != PWDB_SUCCESS); - - if ((retval != UNIX_FAILED) && force_failure) { - retval = UNIX_FAILED; - } - - /* return pass or fail */ - - exit(retval); -} - -/* - * Copyright (c) Andrew G. Morgan, 1997. All rights reserved - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, and the entire permission notice in its entirety, - * including the disclaimer of warranties. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. The name of the author may not be used to endorse or promote - * products derived from this software without specific prior - * written permission. - * - * ALTERNATIVELY, this product may be distributed under the terms of - * the GNU Public License, in which case the provisions of the GPL are - * required INSTEAD OF the above restrictions. (This clause is - * necessary due to a potential bad interaction between the GPL and - * the restrictions contained in a BSD-style copyright.) - * - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED - * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, - * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES - * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR - * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, - * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED - * OF THE POSSIBILITY OF SUCH DAMAGE. - */ |