356 lines
6.9 KiB
C
356 lines
6.9 KiB
C
/* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */
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/* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF */
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/* UNIX System Laboratories, Inc. */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ident "@(#)keyserv:update.c 1.4.4.3"
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/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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* PROPRIETARY NOTICE (Combined)
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*
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* This source code is unpublished proprietary information
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* constituting, or derived under license from AT&T's UNIX(r) System V.
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* In addition, portions of such source code were derived from Berkeley
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* 4.3 BSD under license from the Regents of the University of
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* California.
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*
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*
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*
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* Copyright Notice
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*
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* Notice of copyright on this source code product does not indicate
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* publication.
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*
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* (c) 1986,1987,1988,1989,1990 Sun Microsystems, Inc
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* (c) 1983,1984,1985,1986,1987,1988,1989,1990 AT&T.
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* (c) 1990,1991 UNIX System Laboratories, Inc.
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* All rights reserved.
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*/
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#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)newkey.c 1.X 89/8/17 Copyr 1986 Sun Micro";
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#endif
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/*
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* Copyright (C) 1986, Sun Microsystems, Inc.
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*/
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/*
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* Administrative tool to add a new user to the publickey database
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*/
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#include <stdio.h>
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#include <rpc/rpc.h>
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#include <rpc/key_prot.h>
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#ifdef YP
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#include <rpcsvc/ypclnt.h>
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#include <sys/wait.h>
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#include <netdb.h>
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#endif /* YP */
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#include <pwd.h>
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#include <string.h>
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#include <sys/resource.h>
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#ifdef YP
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#define MAXMAPNAMELEN 256
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#else
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#define YPOP_CHANGE 1 /* change, do not add */
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#define YPOP_INSERT 2 /* add, do not change */
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#define YPOP_DELETE 3 /* delete this entry */
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#define YPOP_STORE 4 /* add, or change */
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#endif
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extern char * getpass();
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#ifdef YP
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static int _openchild( char *command, FILE **fto, FILE **ffrom);
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static char * basename( char *path);
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static char SHELL[] = "/sbin/sh";
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static char YPDBPATH[]="/var/yp";
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static char PKMAP[] = "publickey.byname";
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static char UPDATEFILE[] = "updaters";
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#else
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static int match( char *line, char *name);
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static char PKFILE[] = "/etc/publickey";
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#endif /* YP */
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#ifdef YP
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/*
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* Determine if requester is allowed to update the given map,
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* and update it if so. Returns the yp status, which is zero
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* if there is no access violation.
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*/
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mapupdate(requester, mapname, op, keylen, key, datalen, data)
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char *requester;
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char *mapname;
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u_int op;
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u_int keylen;
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char *key;
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u_int datalen;
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char *data;
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{
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char updater[MAXMAPNAMELEN + 40];
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FILE *childargs;
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FILE *childrslt;
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#ifdef WEXITSTATUS
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int status;
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#else
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union wait status;
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#endif
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pid_t pid;
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u_int yperrno;
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#ifdef DEBUG
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printf("%s %s\n", key, data);
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#endif
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(void)sprintf(updater, "/var/yp/ypbuild SHELL=/sbin/sh -s -f %s %s",
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UPDATEFILE, mapname);
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pid = _openchild(updater, &childargs, &childrslt);
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if (pid < 0) {
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return (YPERR_YPERR);
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}
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/*
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* Write to child
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*/
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(void)fprintf(childargs, "%s\n", requester);
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(void)fprintf(childargs, "%u\n", op);
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(void)fprintf(childargs, "%u\n", keylen);
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(void)fwrite(key, (int)keylen, 1, childargs);
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(void)fprintf(childargs, "\n");
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(void)fprintf(childargs, "%u\n", datalen);
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(void)fwrite(data, (int)datalen, 1, childargs);
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(void)fprintf(childargs, "\n");
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(void)fclose(childargs);
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/*
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* Read from child
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*/
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(void)fscanf(childrslt, "%d", &yperrno);
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(void)fclose(childrslt);
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(void)wait(&status);
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#ifdef WEXITSTATUS
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if (WEXITSTATUS(status) != 0) {
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#else
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if (status.w_retcode != 0) {
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#endif
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return (YPERR_YPERR);
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}
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return (yperrno);
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}
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/*
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* returns pid, or -1 for failure
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*/
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static int
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_openchild(
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char *command,
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FILE **fto,
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FILE **ffrom)
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{
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int i;
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pid_t pid;
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int pdto[2];
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int pdfrom[2];
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char *com;
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struct rlimit rl;
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if (pipe(pdto) < 0) {
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goto error1;
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}
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if (pipe(pdfrom) < 0) {
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goto error2;
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}
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#ifdef VFORK
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switch (pid = vfork()) { /* } */
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#else
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switch (pid = fork()) {
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#endif
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case -1:
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goto error3;
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case 0:
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/*
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* child: read from pdto[0], write into pdfrom[1]
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*/
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(void)close(0);
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(void)dup(pdto[0]);
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(void)close(1);
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(void)dup(pdfrom[1]);
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getrlimit(RLIMIT_NOFILE, &rl);
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for (i = rl.rlim_cur - 1; i >= 3; i--) {
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(void) close(i);
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}
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com = malloc((unsigned) strlen(command) + 6);
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if (com == NULL) {
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_exit(~0);
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}
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(void)sprintf(com, "exec %s", command);
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execl(SHELL, basename(SHELL), "-c", com, NULL);
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_exit(~0);
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default:
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/*
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* parent: write into pdto[1], read from pdfrom[0]
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*/
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*fto = fdopen(pdto[1], "w");
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(void)close(pdto[0]);
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*ffrom = fdopen(pdfrom[0], "r");
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(void)close(pdfrom[1]);
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break;
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}
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return (pid);
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/*
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* error cleanup and return
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*/
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error3:
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(void)close(pdfrom[0]);
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(void)close(pdfrom[1]);
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error2:
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(void)close(pdto[0]);
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(void)close(pdto[1]);
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error1:
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return (-1);
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}
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static char *
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basename( char *path)
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{
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char *p;
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p = strrchr(path, '/');
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if (p == NULL) {
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return (path);
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} else {
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return (p + 1);
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}
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}
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#else /* !YP */
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#define ERR_ACCESS 1
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#define ERR_MALLOC 2
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#define ERR_READ 3
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#define ERR_WRITE 4
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#define ERR_DBASE 5
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#define ERR_KEY 6
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/*
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* Determine if requester is allowed to update the given map,
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* and update it if so. Returns the status, which is zero
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* if there is no access violation. This function updates
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* the local file and then shuts up.
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*/
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localupdate(name, filename, op, keylen, key, datalen, data)
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char *name; /* Name of the requestor */
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char *filename;
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u_int op;
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u_int keylen; /* Not used */
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char *key;
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u_int datalen; /* Not used */
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char *data;
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{
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char line[256];
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FILE *rf;
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FILE *wf;
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char *tmpname;
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int err;
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/*
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* Check permission
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*/
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if (strcmp(name, key) != 0) {
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return (ERR_ACCESS);
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}
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if (strcmp(name, "nobody") == 0) {
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/*
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* Can't change "nobody"s key.
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*/
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return (ERR_ACCESS);
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}
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/*
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* Open files
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*/
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tmpname = malloc(strlen(filename) + 4);
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if (tmpname == NULL) {
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return (ERR_MALLOC);
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}
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sprintf(tmpname, "%s.tmp", filename);
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rf = fopen(filename, "r");
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if (rf == NULL) {
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return (ERR_READ);
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}
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wf = fopen(tmpname, "w");
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if (wf == NULL) {
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return (ERR_WRITE);
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}
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err = -1;
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while (fgets(line, sizeof (line), rf)) {
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if (err < 0 && match(line, name)) {
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switch (op) {
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case YPOP_INSERT:
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err = ERR_KEY;
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break;
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case YPOP_STORE:
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case YPOP_CHANGE:
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fprintf(wf, "%s %s\n", key, data);
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err = 0;
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break;
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case YPOP_DELETE:
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/* do nothing */
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err = 0;
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break;
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}
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} else {
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fputs(line, wf);
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}
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}
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if (err < 0) {
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switch (op) {
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case YPOP_CHANGE:
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case YPOP_DELETE:
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err = ERR_KEY;
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break;
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case YPOP_INSERT:
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case YPOP_STORE:
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err = 0;
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fprintf(wf, "%s %s\n", key, data);
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break;
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}
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}
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fclose(wf);
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fclose(rf);
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if (err == 0) {
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if (rename(tmpname, filename) < 0) {
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return (ERR_DBASE);
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}
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} else {
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if (unlink(tmpname) < 0) {
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return (ERR_DBASE);
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}
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}
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return (err);
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}
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static int
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match(
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char *line,
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char *name)
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{
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int len;
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len = strlen(name);
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return (strncmp(line, name, len) == 0 &&
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(line[len] == ' ' || line[len] == '\t'));
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}
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#endif /* !YP */
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