shithub: tlsclient

ref: bb7ac2a50c283e82493a0cb6ae62c5c2ab36b2ae
dir: /bsd.c/

/*-
 * Copyright (c) 1995 Berkeley Software Design, Inc. 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, this list of conditions and the following disclaimer.
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Berkeley Software Design,
 *      Inc.
 * 4. The name of Berkeley Software Design, Inc.  may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``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 BERKELEY SOFTWARE DESIGN, INC. 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.
 */

#include <sys/types.h>
#include <sys/resource.h>
#include <sys/stat.h>

#include <errno.h>
#include <pwd.h>
#include <readpassphrase.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <util.h>
#include <login_cap.h>

#undef login

#include <u.h>
#include <args.h>
#include <libc.h>
#include <auth.h>
#include <authsrv.h>
#include <libsec.h>

#include "fncs.h"

char *authserver;

int
main(int argc, char *argv[])
{
	FILE *back = NULL;
	char *username = NULL, *wheel = NULL;
	char response[1024], pbuf[1024], *pass = "";
	char authconf[1024];
	int n, afd;
	int ch, mode = 0, fd = -1;
	AuthInfo *ai;
	struct stat sb;
	char *p;

	(void)signal(SIGQUIT, SIG_IGN);
	(void)signal(SIGINT, SIG_IGN);
	(void)setpriority(PRIO_PROCESS, 0, 0);

	openlog(NULL, LOG_ODELAY, LOG_AUTH);

	while ((ch = getopt(argc, argv, "ds:v:")) != -1) {
		switch (ch) {
		case 'd':
			back = stdout;
			break;
		case 's':	/* service */
			if (strcmp(optarg, "login") == 0)
				mode = 0;
			else if (strcmp(optarg, "challenge") == 0)
				mode = 1;
			else if (strcmp(optarg, "response") == 0)
				mode = 2;
			else {
				syslog(LOG_ERR, "%s: invalid service", optarg);
				exit(1);
			}
			break;
		case 'v':
			if (strncmp(optarg, "wheel=", 6) == 0)
				wheel = optarg + 6;
			break;
		default:
			syslog(LOG_ERR, "usage error");
			exit(1);
		}
	}

	switch (argc - optind) {
	case 2:
	case 1:
		username = argv[optind];
		break;
	default:
		syslog(LOG_ERR, "usage error");
		exit(1);
	}

	if (back == NULL && (back = fdopen(3, "r+")) == NULL) {
		syslog(LOG_ERR, "reopening back channel: %m");
		exit(1);
	}

	snprint(authconf, sizeof authconf, "/home/%s/.p9auth", username);
	afd = open(authconf, OREAD);
	if(afd < 0){
		fprintf(back, BI_REJECT " errormsg %s\n",
			"user does not have an authserver configured");
		exit(0);
	}
	if(fstat(afd, &sb) < 0){
		syslog(LOG_ERR, "could not stat: %m");
		exit(1);
	}
	if(sb.st_mode & 077 != 0){
		fprintf(back, BI_REJECT " errormsg %s\n",
			"user authserver has improper permissions");
		exit(0);
	}
	n = read(afd, authconf, sizeof authconf - 1);
	if(n < 0){
		fprintf(back, BI_REJECT " errormsg %s\n",
			"could not read");
		exit(1);
	}
	authserver = malloc(n+1);
	if(authserver == NULL){
		syslog(LOG_ERR, "oom");
		exit(1);
	}
	memmove(authserver, authconf, n);
	authserver[n] = '\0';
	if((p = strchr(authserver, '\n')) != NULL)
		*p = '\0';

	if (wheel != NULL && strcmp(wheel, "yes") != 0) {
		fprintf(back, BI_VALUE " errormsg %s\n",
		    "you are not in group wheel");
		fprintf(back, BI_REJECT "\n");
		exit(1);
	}

	if (mode == 1) {
		fprintf(back, BI_SILENT "\n");
		exit(0);
	}

	(void)setpriority(PRIO_PROCESS, 0, -4);

	if (mode == 2) {
		mode = 0;
		ch = -1;
		while (++ch < sizeof(response) &&
		    read(3, &response[ch], 1) == 1) {
			if (response[ch] == '\0' && ++mode == 2)
				break;
			if (response[ch] == '\0' && mode == 1)
				pass = response + ch + 1;
		}
		if (mode < 2) {
			syslog(LOG_ERR, "protocol error on back channel");
			exit(1);
		}
	} else {
		pass = readpassphrase("Password:", pbuf, sizeof(pbuf),
		    RPP_ECHO_OFF);
	}

	if (pass == NULL){
		fprintf(back, BI_REJECT "\n");
		exit(1);
	}

	fd = unix_dial(authserver, "17019");
	if(fd < 0){
		fprintf(back, BI_REJECT "\n");
		exit(1);
	}

	ai = p9any(username, pass, fd);
	if(ai == nil){
		fprintf(back, BI_REJECT "\n");
		exit(1);
	}

	fprintf(back, BI_AUTH "\n");
	exit(0);
}