282 lines
8.1 KiB
C
282 lines
8.1 KiB
C
/*
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* Dropbear - a SSH2 server
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*
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* Copyright (c) 2002,2003 Matt Johnston
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* strlcat() is copyright as follows:
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* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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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, are 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, 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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* daemon() and getusershell() is copyright as follows:
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*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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, are 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, 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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Modifications for Dropbear to getusershell() are by Paul Marinceu
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*/
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#include "includes.h"
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#ifndef HAVE_GETUSERSHELL
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static char **curshell, **shells, *strings;
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static char **initshells();
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#endif
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#ifndef HAVE_STRLCPY
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/* Implemented by matt as specified in freebsd 4.7 manpage.
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* We don't require great speed, is simply for use with sshpty code */
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size_t strlcpy(char *dst, const char *src, size_t size) {
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size_t i;
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/* this is undefined, though size==0 -> return 0 */
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if (size < 1) {
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return 0;
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}
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for (i = 0; i < size-1; i++) {
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if (src[i] == '\0') {
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break;
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} else {
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dst[i] = src[i];
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}
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}
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dst[i] = '\0';
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return strlen(src);
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}
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#endif /* HAVE_STRLCPY */
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#ifndef HAVE_STRLCAT
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/* taken from openbsd-compat for OpenSSH 3.6.1p1 */
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/* "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $"
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*
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* Appends src to string dst of size siz (unlike strncat, siz is the
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* full size of dst, not space left). At most siz-1 characters
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* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
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* Returns strlen(src) + MIN(siz, strlen(initial dst)).
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* If retval >= siz, truncation occurred.
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*/
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size_t
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strlcat(dst, src, siz)
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char *dst;
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const char *src;
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size_t siz;
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{
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register char *d = dst;
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register const char *s = src;
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register size_t n = siz;
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size_t dlen;
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/* Find the end of dst and adjust bytes left but don't go past end */
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while (n-- != 0 && *d != '\0')
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d++;
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dlen = d - dst;
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n = siz - dlen;
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if (n == 0)
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return(dlen + strlen(s));
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while (*s != '\0') {
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if (n != 1) {
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*d++ = *s;
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n--;
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}
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s++;
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}
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*d = '\0';
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return(dlen + (s - src)); /* count does not include NUL */
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}
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#endif /* HAVE_STRLCAT */
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#ifndef HAVE_DAEMON
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/* From NetBSD - daemonise a process */
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int daemon(int nochdir, int noclose) {
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int fd;
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switch (fork()) {
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case -1:
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return (-1);
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case 0:
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break;
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default:
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_exit(0);
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}
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if (setsid() == -1)
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return -1;
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if (!nochdir)
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(void)chdir("/");
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if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
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(void)dup2(fd, STDIN_FILENO);
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(void)dup2(fd, STDOUT_FILENO);
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(void)dup2(fd, STDERR_FILENO);
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if (fd > STDERR_FILENO)
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(void)close(fd);
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}
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return 0;
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}
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#endif /* HAVE_DAEMON */
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#ifndef HAVE_BASENAME
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char *basename(const char *path) {
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char *foo = strrchr(path, '/');
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return ++foo;
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}
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#endif /* HAVE_BASENAME */
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#ifndef HAVE_GETUSERSHELL
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/*
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* Get a list of shells from /etc/shells, if it exists.
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*/
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char * getusershell() {
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char *ret;
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if (curshell == NULL)
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curshell = initshells();
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ret = *curshell;
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if (ret != NULL)
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curshell++;
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return (ret);
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}
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void endusershell() {
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if (shells != NULL)
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free(shells);
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shells = NULL;
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if (strings != NULL)
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free(strings);
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strings = NULL;
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curshell = NULL;
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}
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void setusershell() {
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curshell = initshells();
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}
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static char **initshells() {
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/* don't touch this list. */
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const char *okshells[] = { "/bin/sh", "/bin/csh", NULL };
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register char **sp, *cp;
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register FILE *fp;
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struct stat statb;
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int flen;
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if (shells != NULL)
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free(shells);
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shells = NULL;
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if (strings != NULL)
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free(strings);
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strings = NULL;
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if ((fp = fopen("/etc/shells", "rc")) == NULL)
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return (char **) okshells;
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if (fstat(fileno(fp), &statb) == -1) {
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(void)fclose(fp);
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return (char **) okshells;
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}
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if ((strings = malloc((u_int)statb.st_size + 1)) == NULL) {
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(void)fclose(fp);
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return (char **) okshells;
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}
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shells = calloc((unsigned)statb.st_size / 3, sizeof (char *));
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if (shells == NULL) {
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(void)fclose(fp);
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free(strings);
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strings = NULL;
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return (char **) okshells;
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}
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sp = shells;
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cp = strings;
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flen = statb.st_size;
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while (fgets(cp, flen - (cp - strings), fp) != NULL) {
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while (*cp != '#' && *cp != '/' && *cp != '\0')
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cp++;
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if (*cp == '#' || *cp == '\0')
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continue;
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*sp++ = cp;
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while (!isspace(*cp) && *cp != '#' && *cp != '\0')
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cp++;
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*cp++ = '\0';
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}
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*sp = NULL;
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(void)fclose(fp);
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return (shells);
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}
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#endif /* HAVE_GETUSERSHELL */
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