/* $OpenBSD: auth-options.c,v 1.92 2020/03/06 18:15:38 markus Exp $ */
/*
* Copyright (c) 2018 Damien Miller <djm@mindrot.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#include <sys/types.h>
#include <stdlib.h>
#include <netdb.h>
#include <pwd.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <ctype.h>
#include <limits.h>
#include "openbsd-compat/sys-queue.h"
#include "xmalloc.h"
#include "ssherr.h"
#include "log.h"
#include "sshbuf.h"
#include "misc.h"
#include "sshkey.h"
#include "match.h"
#include "ssh2.h"
#include "auth-options.h"
static int
dup_strings(char ***dstp, size_t *ndstp, char **src, size_t nsrc)
{
char **dst;
size_t i, j;
*dstp = NULL;
*ndstp = 0;
if (nsrc == 0)
return 0;
if ((dst = calloc(nsrc, sizeof(*src))) == NULL)
return -1;
for (i = 0; i < nsrc; i++) {
if ((dst[i] = strdup(src[i])) == NULL) {
for (j = 0; j < i; j++)
free(dst[j]);
free(dst);
return -1;
}
}
/* success */
*dstp = dst;
*ndstp = nsrc;
return 0;
}
#define OPTIONS_CRITICAL 1
#define OPTIONS_EXTENSIONS 2
static int
cert_option_list(struct sshauthopt *opts, struct sshbuf *oblob,
u_int which, int crit)
{
char *command, *allowed;
char *name = NULL;
struct sshbuf *c = NULL, *data = NULL;
int r, ret = -1, found;
if ((c = sshbuf_fromb(oblob)) == NULL) {
error("%s: sshbuf_fromb failed", __func__);
goto out;
}
while (sshbuf_len(c) > 0) {
sshbuf_free(data);
data = NULL;
if ((r = sshbuf_get_cstring(c, &name, NULL)) != 0 ||
(r = sshbuf_froms(c, &data)) != 0) {
error("Unable to parse certificate options: %s",
ssh_err(r));
goto out;
}
debug3("found certificate option \"%.100s\" len %zu",
name, sshbuf_len(data));
found = 0;
if ((which & OPTIONS_EXTENSIONS) != 0) {
if (strcmp(name, "no-touch-required") == 0) {
opts->no_require_user_presence = 1;
found = 1;
} else if (strcmp(name, "permit-X11-forwarding") == 0) {
opts->permit_x11_forwarding_flag = 1;
found = 1;
} else if (strcmp(name,
"permit-agent-forwarding") == 0) {
opts->permit_agent_forwarding_flag = 1;
found = 1;
} else if (strcmp(name,
"permit-port-forwarding") == 0) {
opts->permit_port_forwarding_flag = 1;
found = 1;
} else if (strcmp(name, "permit-pty") == 0) {
opts->permit_pty_flag = 1;
found = 1;
} else if (strcmp(name, "permit-user-rc") == 0) {
opts->permit_user_rc = 1;
found = 1;
}
}
if (!found && (which & OPTIONS_CRITICAL) != 0) {
if (strcmp(name, "force-command") == 0) {
if ((r = sshbuf_get_cstring(data, &command,
NULL)) != 0) {
error("Unable to parse \"%s\" "
"section: %s", name, ssh_err(r));
goto out;
}
if (opts->force_command != NULL) {
error("Certificate has multiple "
"force-command options");
free(command);