ref: fa83d0a67d9c796e60a13c5a7ce8e9d4d9e97871
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);
}