/* $OpenBSD: auth-options.c,v 1.84 2018/10/03 06:38:35 djm 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 <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"
/*
* Match flag 'opt' in *optsp, and if allow_negate is set then also match
* 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0
* if negated option matches.
* If the option or negated option matches, then *optsp is updated to
* point to the first character after the option.
*/
static int
opt_flag(const char *opt, int allow_negate, const char **optsp)
{
size_t opt_len = strlen(opt);
const char *opts = *optsp;
int negate = 0;
if (allow_negate && strncasecmp(opts, "no-", 3) == 0) {
opts += 3;
negate = 1;
}
if (strncasecmp(opts, opt, opt_len) == 0) {
*optsp = opts + opt_len;
return negate ? 0 : 1;
}
return -1;
}
static char *
opt_dequote(const char **sp, const char **errstrp)
{
const char *s = *sp;
char *ret;
size_t i;
*errstrp = NULL;
if (*s != '"') {
*errstrp = "missing start quote";
return NULL;
}
s++;
if ((ret = malloc(strlen((s)) + 1)) == NULL) {
*errstrp = "memory allocation failed";
return NULL;
}
for (i = 0; *s != '\0' && *s != '"';) {
if (s[0] == '\\' && s[1] == '"')
s++;
ret[i++] = *s++;
}
if (*s == '\0') {
*errstrp = "missing end quote";
free(ret);
return NULL;
}
ret[i] = '\0';
s++;
*sp = s;
return ret;
}
static int
opt_match(const char **opts, const char *term)
{
if (strncasecmp((*opts), term, strlen(term)) == 0 &&
(*opts)[strlen(term)] == '=') {
*opts += strlen(term) + 1;
return 1;
}
return 0;
}
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)