e8420087b0
In some cases replace if (a == null) a = malloc(x); else a = realloc(a, x); with simple reallocf(a, x). Per ANSI-C, this is guaranteed to be the same thing. I've been running these on my system here w/o ill effects for some time. However, the CTM-express is at part 6 of 34 for the CAM changes, so I've not been able to do a build world with the CAM in the tree with these changes. Shouldn't impact anything, but...
672 lines
14 KiB
C
672 lines
14 KiB
C
/*-
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* Copyright (c) 1996 by
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* Sean Eric Fagan <sef@kithrup.com>
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* David Nugent <davidn@blaze.net.au>
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* All rights reserved.
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*
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* Portions copyright (c) 1995,1997 by
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* Berkeley Software Design, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. This work was done expressly for inclusion into FreeBSD. Other use
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* is permitted provided this notation is included.
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* 4. Absolutely no warranty of function or purpose is made by the authors.
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* 5. Modifications may be freely made to this file providing the above
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* conditions are met.
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*
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* Low-level routines relating to the user capabilities database
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*
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* $Id: login_auth.c,v 1.8 1997/07/19 04:47:05 davidn Exp $
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <login_cap.h>
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#include <stdarg.h>
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#include <paths.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <libutil.h>
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#ifdef LOGIN_CAP_AUTH
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/*
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* Comment from BSDI's authenticate.c module:
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* NOTE: THIS MODULE IS TO BE DEPRECATED. FUTURE VERSIONS OF BSD/OS WILL
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* HAVE AN UPDATED API, THOUGH THESE FUNCTIONS WILL CONTINUE TO BE AVAILABLE
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* FOR BACKWARDS COMPATABILITY
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*/
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#define AUTHMAXSPOOL (8 * 1024) /* Max size of authentication data */
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#define AUTHCOMM_FD 3 /* Handle used to read/write auth data */
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struct rmfiles {
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struct rmfiles *next;
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char file[1];
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};
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struct authopts {
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struct authopts *next;
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char opt[1];
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};
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static char *spoolbuf = NULL;
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static int spoolidx = 0;
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static struct rmfiles *rmfirst = NULL;
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static struct authopts *optfirst = NULL;
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/*
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* Setup a known environment for all authentication scripts.
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*/
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static char *auth_environ[] = {
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"PATH=" _PATH_DEFPATH,
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"SHELL=" _PATH_BSHELL,
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NULL,
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};
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/*
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* nextline()
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* Get the next line from the data buffer collected from
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* the authentication program. This function relies on the
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* fact that lines are nul terminated.
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*/
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static char *
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nextline(int *idx)
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{
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char *ptr = NULL;
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if (spoolbuf != NULL && *idx < spoolidx) {
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ptr = spoolbuf + *idx;
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*idx += strlen(ptr) + 1;
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}
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return ptr;
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}
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/*
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* spooldata()
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* Read data returned on authentication backchannel and
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* stuff it into our spool buffer. We also replace \n with nul
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* to make parsing easier later.
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*/
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static int
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spooldata(int fd)
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{
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if (spoolbuf)
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free(spoolbuf);
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spoolidx = 0;
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if (spoolbuf == NULL && (spoolbuf = malloc(AUTHMAXSPOOL)) == NULL)
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syslog(LOG_ERR, "authbuffer malloc: %m");
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else while (spoolidx < sizeof(spoolbuf) - 1) {
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int r = read(fd, spoolbuf + spoolidx, sizeof(spoolbuf)-spoolidx);
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char *b;
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if (r <= 0) {
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spoolbuf[spoolidx] = '\0';
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return 0;
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}
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/*
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* Convert newlines into NULs to allow
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* easier scanning of the file.
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*/
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while ((b = memchr(spoolbuf + spoolidx, '\n', r)) != NULL)
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*b = '\0';
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spoolidx += r;
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}
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return -1;
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}
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/*
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* auth_check()
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* Starts an auth_script() for the given <user>, with a class <class>,
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* style <style>, and service <service>. <style> is necessary,
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* as are <user> and <class>, but <service> is optional -- it defaults
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* to "login".
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* Since auth_script() expects an execl'able program name, authenticate()
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* also concatenates <style> to _PATH_AUTHPROG.
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* Lastly, calls auth_scan(0) to see if there are any "reject" statements,
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* or lack of "auth" statements.
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* Returns -1 on error, 0 on rejection, and >0 on success.
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* (See AUTH_* for the return values.)
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*
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*/
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int
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auth_check(const char *name, const char *clss, const char *style,
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const char *service, int *status)
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{
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int _status;
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if (status == NULL)
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status = &_status;
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*status = 0;
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if (style != NULL) {
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char path[MAXPATHLEN];
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if (service == NULL)
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service = LOGIN_DEFSERVICE;
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snprintf(path, sizeof(path), _PATH_AUTHPROG "%s", style);
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if (auth_script(path, style, "-s", service, name, clss, 0))
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status = 0;
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else
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*status = auth_scan(0);
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return *status & AUTH_ALLOW;
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}
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return -1;
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}
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int
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auth_response(const char *name, const char *class, const char *style,
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const char *service, int *status,
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const char *challenge, const char *response)
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{
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int _status;
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if (status == NULL)
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status = &_status;
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*status = 0;
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if (style != NULL) {
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int datalen;
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char *data;
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if (service == NULL)
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service = LOGIN_DEFSERVICE;
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datalen = strlen(challenge) + strlen(response) + 2;
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if ((data = malloc(datalen)) == NULL) {
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syslog(LOG_ERR, "auth_response: %m");
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warnx("internal resource failure");
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} else {
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char path[MAXPATHLEN];
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snprintf(data, datalen, "%s%c%s", challenge, 0, response);
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snprintf(path, sizeof(path), _PATH_AUTHPROG "%s", style);
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if (auth_script_data(data, datalen, path, style, "-s", service,
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name, class, 0))
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*status = 0;
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else
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*status = auth_scan(0);
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free(data);
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return (*status & AUTH_ALLOW);
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}
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}
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return -1;
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}
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int
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auth_approve(login_cap_t *lc, const char *name, const char *service)
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{
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int r = -1;
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char path[MAXPATHLEN];
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if (lc == NULL) {
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if (strlen(name) > MAXPATHLEN) {
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syslog(LOG_ERR, "%s: username too long", name);
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warnx("username too long");
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} else {
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struct passwd *pwd;
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char *p;
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pwd = getpwnam(name);
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if (pwd == NULL && (p = strchr(name, '.')) != NULL) {
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int i = p - name;
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if (i >= MAXPATHLEN)
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i = MAXPATHLEN - 1;
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strncpy(path, name, i);
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path[i] = '\0';
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pwd = getpwnam(path); /* Fixed bug in BSDI code... */
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}
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if ((lc = login_getpwclass(pwd ? pwd->pw_class : NULL)) == NULL)
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warnx("unable to classify user '%s'", name);
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}
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}
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if (lc != NULL) {
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char *approve;
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char *s;
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if (service != NULL)
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service = LOGIN_DEFSERVICE;
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snprintf(path, sizeof(path), "approve-%s", service);
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if ((approve = login_getcapstr(lc, s = path, NULL, NULL)) == NULL &&
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(approve = login_getcapstr(lc, s = "approve", NULL, NULL)) == NULL)
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r = AUTH_OKAY;
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else {
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if (approve[0] != '/') {
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syslog(LOG_ERR, "Invalid %s script: %s", s, approve);
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warnx("invalid path to approval script");
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} else {
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char *s;
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s = strrchr(approve, '/') + 1;
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if (auth_script(approve, s, name,
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lc->lc_class, service, 0) == 0 &&
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(r = auth_scan(AUTH_OKAY) & AUTH_ALLOW) != 0)
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auth_env();
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}
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}
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}
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return r;
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}
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void
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auth_env(void)
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{
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int idx = 0;
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char *line;
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while ((line = nextline(&idx)) != NULL) {
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if (!strncasecmp(line, BI_SETENV, sizeof(BI_SETENV)-1)) {
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line += sizeof(BI_SETENV) - 1;
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if (*line && isspace(*line)) {
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char *name;
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char ch, *p;
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while (*line && isspace(*line))
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++line;
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name = line;
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while (*line && !isspace(*line))
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++line;
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ch = *(p = line);
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if (*line)
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++line;
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if (setenv(name, line, 1))
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warn("setenv(%s, %s)", name, line);
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*p = ch;
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}
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}
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}
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}
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char *
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auth_value(const char *what)
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{
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int idx = 0;
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char *line;
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while ((line = nextline(&idx)) != NULL) {
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if (!strncasecmp(line, BI_VALUE, sizeof(BI_VALUE)-1)) {
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char *name;
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line += sizeof(BI_VALUE) - 1;
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while (*line && isspace(*line))
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++line;
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name = line;
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if (*line) {
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int i;
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char ch, *p;
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ch = *(p = line);
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*line++ = '\0';
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i = strcmp(name, what);
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*p = ch;
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if (i == 0)
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return auth_mkvalue(line);
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}
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}
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}
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return NULL;
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}
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char *
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auth_mkvalue(const char *value)
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{
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char *big, *p;
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big = malloc(strlen(value) * 4 + 1);
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if (big != NULL) {
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for (p = big; *value; ++value) {
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switch (*value) {
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case '\r':
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*p++ = '\\';
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*p++ = 'r';
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break;
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case '\n':
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*p++ = '\\';
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*p++ = 'n';
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break;
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case '\\':
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*p++ = '\\';
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*p++ = *value;
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break;
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case '\t':
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case ' ':
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if (p == big)
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*p++ = '\\';
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*p++ = *value;
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break;
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default:
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if (!isprint(*value)) {
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*p++ = '\\';
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*p++ = ((*value >> 6) & 0x3) + '0';
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*p++ = ((*value >> 3) & 0x7) + '0';
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*p++ = ((*value ) & 0x7) + '0';
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} else
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*p++ = *value;
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break;
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}
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}
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*p = '\0';
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big = reallocf(big, strlen(big) + 1);
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}
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return big;
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}
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#define NARGC 63
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static int
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_auth_script(const char *data, int nbytes, const char *path, va_list ap)
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{
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int r, argc, status;
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int pfd[2];
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pid_t pid;
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struct authopts *e;
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char *argv[NARGC+1];
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r = -1;
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argc = 0;
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for (e = optfirst; argc < (NARGC - 1) && e != NULL; e = e->next) {
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argv[argc++] = "-v";
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argv[argc++] = e->opt;
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}
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while (argc < NARGC && (argv[argc] = va_arg(ap, char *)) != NULL)
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++argc;
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argv[argc] = NULL;
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if (argc >= NARGC && va_arg(ap, char *))
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syslog(LOG_ERR, "too many arguments");
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else if (_secure_path(path, 0, 0) < 0) {
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syslog(LOG_ERR, "%s: path not secure", path);
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warnx("invalid script: %s", path);
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} else if (socketpair(PF_LOCAL, SOCK_STREAM, 0, pfd) < 0) {
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syslog(LOG_ERR, "unable to create backchannel %m");
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warnx("internal resource failure");
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} else switch (pid = fork()) {
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case -1: /* fork() failure */
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close(pfd[0]);
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close(pfd[1]);
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syslog(LOG_ERR, "fork %s: %m", path);
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warnx("internal resource failure");
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break;
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case 0: /* child process */
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close(pfd[0]);
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if (pfd[1] != AUTHCOMM_FD) {
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if (dup2(pfd[1], AUTHCOMM_FD) < 0)
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err(1, "dup backchannel");
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close(pfd[1]);
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}
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for (r = getdtablesize(); --r > AUTHCOMM_FD; )
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close(r);
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execve(path, argv, auth_environ);
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syslog(LOG_ERR, "exec %s: %m", path);
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err(1, path);
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default: /* parent */
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close(pfd[1]);
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if (data && nbytes)
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write(pfd[0], data, nbytes);
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r = spooldata(pfd[0]);
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close(pfd[0]);
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if (waitpid(pid, &status, 0) < 0) {
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syslog(LOG_ERR, "%s: waitpid: %m", path);
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warnx("internal failure");
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r = -1;
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} else {
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if (r != 0 || !WIFEXITED(status) || WEXITSTATUS(status) != 0)
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r = -1;
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}
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/* kill the buffer if it is of no use */
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if (r != 0) {
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free(spoolbuf);
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spoolbuf = NULL;
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spoolidx = 0;
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}
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break;
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}
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return r;
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}
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/*
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* auth_script()
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* Runs an authentication program with specified arguments.
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* It sets up file descriptor 3 for the program to write to;
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* it stashes the output somewhere. The output of the program
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* consists of statements:
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* reject [challenge|silent]
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* authorize [root|secure]
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* setenv <name> [<value>]
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* remove <file>
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*
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* Terribly exciting, isn't it?
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* Output cannot exceed AUTHMAXSPOOL characters.
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*/
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int
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auth_script(const char *path, ...)
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{
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int r;
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va_list ap;
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va_start(ap, path);
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r = _auth_script(NULL, 0, path, ap);
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va_end(ap);
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return r;
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}
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int
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auth_script_data(const char *data, int nbytes, const char *path, ...)
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{
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int r;
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va_list ap;
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va_start(ap, path);
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r = _auth_script(data, nbytes, path, ap);
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va_end(ap);
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return r;
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}
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static void
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add_rmlist(const char *file)
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{
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struct rmfiles *rm;
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if ((rm = malloc(sizeof(struct rmfiles) + strlen(file) + 1)) == NULL)
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syslog(LOG_ERR, "add_rmfile malloc: %m");
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else {
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strcpy(rm->file, file);
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rm->next = rmfirst;
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rmfirst = rm;
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}
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}
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int
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auth_scan(int okay)
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{
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int idx = 0;
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char *line;
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while ((line = nextline(&idx)) != NULL) {
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if (!strncasecmp(line, BI_REJECT, sizeof(BI_REJECT)-1)) {
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line += sizeof(BI_REJECT) - 1;
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while (*line && isspace(*line))
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++line;
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if (*line) {
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if (!strcasecmp(line, "silent"))
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return AUTH_SILENT;
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if (!strcasecmp(line, "challenge"))
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return AUTH_CHALLENGE;
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}
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return 0;
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} else if (!strncasecmp(line, BI_AUTH, sizeof(BI_AUTH)-1)) {
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line += sizeof(BI_AUTH) - 1;
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while (*line && isspace(*line))
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++line;
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if (*line == '\0')
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okay |= AUTH_OKAY;
|
|
else if (!strcasecmp(line, "root"))
|
|
okay |= AUTH_ROOTOKAY;
|
|
else if (!strcasecmp(line, "secure"))
|
|
okay |= AUTH_SECURE;
|
|
}
|
|
else if (!strncasecmp(line, BI_REMOVE, sizeof(BI_REMOVE)-1)) {
|
|
line += sizeof(BI_REMOVE) - 1;
|
|
while (*line && isspace(*line))
|
|
++line;
|
|
if (*line)
|
|
add_rmlist(line);
|
|
}
|
|
}
|
|
|
|
return okay;
|
|
}
|
|
|
|
|
|
int
|
|
auth_setopt(const char *n, const char *v)
|
|
{
|
|
int r;
|
|
struct authopts *e;
|
|
|
|
if ((e = malloc(sizeof(*e) + strlen(n) + strlen(v) + 1)) == NULL)
|
|
r = -1;
|
|
else {
|
|
sprintf(e->opt, "%s=%s", n, v);
|
|
e->next = optfirst;
|
|
optfirst = e;
|
|
r = 0;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
|
|
void
|
|
auth_clropts(void)
|
|
{
|
|
struct authopts *e;
|
|
|
|
while ((e = optfirst) != NULL) {
|
|
optfirst = e->next;
|
|
free(e);
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
auth_rmfiles(void)
|
|
{
|
|
struct rmfiles *rm;
|
|
|
|
while ((rm = rmfirst) != NULL) {
|
|
unlink(rm->file);
|
|
rmfirst = rm->next;
|
|
free(rm);
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
/*
|
|
* auth_checknologin()
|
|
* Checks for the existance of a nologin file in the login_cap
|
|
* capability <lc>. If there isn't one specified, then it checks
|
|
* to see if this class should just ignore nologin files. Lastly,
|
|
* it tries to print out the default nologin file, and, if such
|
|
* exists, it exits.
|
|
*/
|
|
|
|
void
|
|
auth_checknologin(login_cap_t *lc)
|
|
{
|
|
char *file;
|
|
|
|
/* Do we ignore a nologin file? */
|
|
if (login_getcapbool(lc, "ignorenologin", 0))
|
|
return;
|
|
|
|
/* Note that <file> will be "" if there is no nologin capability */
|
|
if ((file = login_getcapstr(lc, "nologin", "", NULL)) == NULL)
|
|
exit(1);
|
|
|
|
/*
|
|
* *file is true IFF there was a "nologin" capability
|
|
* Note that auth_cat() returns 1 only if the specified
|
|
* file exists, and is readable. E.g., /.nologin exists.
|
|
*/
|
|
if ((*file && auth_cat(file)) || auth_cat(_PATH_NOLOGIN))
|
|
exit(1);
|
|
}
|
|
|
|
|
|
/*
|
|
* auth_cat()
|
|
* Checks for the readability of <file>; if it can be opened for
|
|
* reading, it prints it out to stdout, and then exits. Otherwise,
|
|
* it returns 0 (meaning no nologin file).
|
|
*/
|
|
|
|
int
|
|
auth_cat(const char *file)
|
|
{
|
|
int fd, count;
|
|
char buf[BUFSIZ];
|
|
|
|
if ((fd = open(file, O_RDONLY)) < 0)
|
|
return 0;
|
|
while ((count = read(fd, buf, sizeof(buf))) > 0)
|
|
(void)write(fileno(stdout), buf, count);
|
|
close(fd);
|
|
sleep(5); /* wait an arbitrary time to drain */
|
|
return 1;
|
|
}
|