2e68cfbf40
Signed-off-by: Jakub Jelen <jjelen@redhat.com> Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
83 строки
2.3 KiB
C
83 строки
2.3 KiB
C
/*
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* Copyright 2022 Jakub Jelen <jjelen@redhat.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define LIBSSH_STATIC 1
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#include "libssh/libssh.h"
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#include "knownhosts.c"
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
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{
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char *hostname = NULL;
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const uint8_t *hostname_end = NULL;
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size_t hostname_len = 0;
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char filename[256];
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struct ssh_list *entries = NULL;
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struct ssh_iterator *it = NULL;
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FILE *fp = NULL;
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/* Interpret the first part of the string (until the first NULL byte)
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* as a hostname we are searching for in the file */
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hostname_end = memchr(data, '\0', size);
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if (hostname_end == NULL) {
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return 1;
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}
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hostname_len = hostname_end - data + 1;
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if (hostname_len > 253) {
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/* This is the maximum valid length of a hostname */
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return 1;
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}
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hostname = malloc(hostname_len);
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if (hostname == NULL) {
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return 1;
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}
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memcpy(hostname, data, hostname_len);
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snprintf(filename, sizeof(filename), "/tmp/libfuzzer.%d", getpid());
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fp = fopen(filename, "wb");
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if (!fp) {
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free(hostname);
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return 1;
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}
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fwrite(data + hostname_len, size - hostname_len, 1, fp);
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fclose(fp);
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ssh_init();
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ssh_known_hosts_read_entries(hostname, filename, &entries);
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for (it = ssh_list_get_iterator(entries);
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it != NULL;
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it = ssh_list_get_iterator(entries)) {
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struct ssh_knownhosts_entry *entry = NULL;
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entry = ssh_iterator_value(struct ssh_knownhosts_entry *, it);
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ssh_knownhosts_entry_free(entry);
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ssh_list_remove(entries, it);
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}
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ssh_list_free(entries);
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ssh_finalize();
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free(hostname);
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unlink(filename);
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return 0;
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}
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