Some notable changes, from upstream's release notes: - sshd(8): Remove support for obsolete "host/port" syntax. - ssh(1): When prompting whether to record a new host key, accept the key fingerprint as a synonym for "yes". - ssh-keygen(1): when acting as a CA and signing certificates with an RSA key, default to using the rsa-sha2-512 signature algorithm. - ssh(1), sshd(8), ssh-keygen(1): this release removes the "ssh-rsa" (RSA/SHA1) algorithm from those accepted for certificate signatures. - ssh-sk-helper(8): this is a new binary. It is used by the FIDO/U2F support to provide address-space isolation for token middleware libraries (including the internal one). - ssh(1): this release enables UpdateHostkeys by default subject to some conservative preconditions. - scp(1): this release changes the behaviour of remote to remote copies (e.g. "scp host-a:/path host-b:") to transfer through the local host by default. - scp(1): experimental support for transfers using the SFTP protocol as a replacement for the venerable SCP/RCP protocol that it has traditionally used. Additional integration work is needed to support FIDO/U2F in the base system. Deprecation Notice ------------------ OpenSSH will disable the ssh-rsa signature scheme by default in the next release. Reviewed by: imp MFC after: 1 month Relnotes: Yes Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D29985
272 lines
6.2 KiB
C
272 lines
6.2 KiB
C
/* $OpenBSD: sshbuf-misc.c,v 1.17 2021/08/11 05:21:32 djm Exp $ */
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/*
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* Copyright (c) 2011 Damien Miller
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <stdlib.h>
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#ifdef HAVE_STDINT_H
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# include <stdint.h>
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#endif
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#include <stdio.h>
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#include <limits.h>
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#include <string.h>
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#include <resolv.h>
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#include <ctype.h>
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#include "ssherr.h"
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#define SSHBUF_INTERNAL
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#include "sshbuf.h"
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void
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sshbuf_dump_data(const void *s, size_t len, FILE *f)
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{
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size_t i, j;
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const u_char *p = (const u_char *)s;
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for (i = 0; i < len; i += 16) {
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fprintf(f, "%.4zu: ", i);
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for (j = i; j < i + 16; j++) {
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if (j < len)
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fprintf(f, "%02x ", p[j]);
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else
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fprintf(f, " ");
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}
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fprintf(f, " ");
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for (j = i; j < i + 16; j++) {
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if (j < len) {
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if (isascii(p[j]) && isprint(p[j]))
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fprintf(f, "%c", p[j]);
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else
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fprintf(f, ".");
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}
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}
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fprintf(f, "\n");
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}
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}
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void
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sshbuf_dump(const struct sshbuf *buf, FILE *f)
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{
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fprintf(f, "buffer len = %zu\n", sshbuf_len(buf));
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sshbuf_dump_data(sshbuf_ptr(buf), sshbuf_len(buf), f);
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}
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char *
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sshbuf_dtob16(struct sshbuf *buf)
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{
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size_t i, j, len = sshbuf_len(buf);
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const u_char *p = sshbuf_ptr(buf);
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char *ret;
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const char hex[] = "0123456789abcdef";
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if (len == 0)
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return strdup("");
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if (SIZE_MAX / 2 <= len || (ret = malloc(len * 2 + 1)) == NULL)
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return NULL;
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for (i = j = 0; i < len; i++) {
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ret[j++] = hex[(p[i] >> 4) & 0xf];
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ret[j++] = hex[p[i] & 0xf];
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}
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ret[j] = '\0';
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return ret;
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}
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int
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sshbuf_dtob64(const struct sshbuf *d, struct sshbuf *b64, int wrap)
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{
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size_t i, slen = 0;
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char *s = NULL;
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int r;
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if (d == NULL || b64 == NULL || sshbuf_len(d) >= SIZE_MAX / 2)
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return SSH_ERR_INVALID_ARGUMENT;
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if (sshbuf_len(d) == 0)
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return 0;
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slen = ((sshbuf_len(d) + 2) / 3) * 4 + 1;
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if ((s = malloc(slen)) == NULL)
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return SSH_ERR_ALLOC_FAIL;
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if (b64_ntop(sshbuf_ptr(d), sshbuf_len(d), s, slen) == -1) {
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r = SSH_ERR_INTERNAL_ERROR;
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goto fail;
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}
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if (wrap) {
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for (i = 0; s[i] != '\0'; i++) {
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if ((r = sshbuf_put_u8(b64, s[i])) != 0)
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goto fail;
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if (i % 70 == 69 && (r = sshbuf_put_u8(b64, '\n')) != 0)
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goto fail;
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}
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if ((i - 1) % 70 != 69 && (r = sshbuf_put_u8(b64, '\n')) != 0)
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goto fail;
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} else {
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if ((r = sshbuf_put(b64, s, strlen(s))) != 0)
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goto fail;
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}
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/* Success */
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r = 0;
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fail:
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freezero(s, slen);
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return r;
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}
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char *
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sshbuf_dtob64_string(const struct sshbuf *buf, int wrap)
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{
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struct sshbuf *tmp;
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char *ret;
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if ((tmp = sshbuf_new()) == NULL)
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return NULL;
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if (sshbuf_dtob64(buf, tmp, wrap) != 0) {
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sshbuf_free(tmp);
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return NULL;
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}
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ret = sshbuf_dup_string(tmp);
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sshbuf_free(tmp);
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return ret;
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}
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int
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sshbuf_b64tod(struct sshbuf *buf, const char *b64)
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{
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size_t plen = strlen(b64);
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int nlen, r;
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u_char *p;
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if (plen == 0)
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return 0;
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if ((p = malloc(plen)) == NULL)
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return SSH_ERR_ALLOC_FAIL;
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if ((nlen = b64_pton(b64, p, plen)) < 0) {
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freezero(p, plen);
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return SSH_ERR_INVALID_FORMAT;
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}
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if ((r = sshbuf_put(buf, p, nlen)) < 0) {
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freezero(p, plen);
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return r;
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}
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freezero(p, plen);
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return 0;
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}
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int
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sshbuf_dtourlb64(const struct sshbuf *d, struct sshbuf *b64, int wrap)
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{
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int r = SSH_ERR_INTERNAL_ERROR;
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u_char *p;
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struct sshbuf *b = NULL;
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size_t i, l;
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if ((b = sshbuf_new()) == NULL)
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return SSH_ERR_ALLOC_FAIL;
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/* Encode using regular base64; we'll transform it once done */
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if ((r = sshbuf_dtob64(d, b, wrap)) != 0)
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goto out;
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/* remove padding from end of encoded string*/
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for (;;) {
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l = sshbuf_len(b);
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if (l <= 1 || sshbuf_ptr(b) == NULL) {
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r = SSH_ERR_INTERNAL_ERROR;
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goto out;
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}
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if (sshbuf_ptr(b)[l - 1] != '=')
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break;
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if ((r = sshbuf_consume_end(b, 1)) != 0)
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goto out;
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}
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/* Replace characters with rfc4648 equivalents */
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l = sshbuf_len(b);
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if ((p = sshbuf_mutable_ptr(b)) == NULL) {
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r = SSH_ERR_INTERNAL_ERROR;
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goto out;
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}
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for (i = 0; i < l; i++) {
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if (p[i] == '+')
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p[i] = '-';
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else if (p[i] == '/')
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p[i] = '_';
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}
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r = sshbuf_putb(b64, b);
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out:
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sshbuf_free(b);
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return r;
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}
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char *
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sshbuf_dup_string(struct sshbuf *buf)
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{
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const u_char *p = NULL, *s = sshbuf_ptr(buf);
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size_t l = sshbuf_len(buf);
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char *r;
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if (s == NULL || l > SIZE_MAX)
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return NULL;
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/* accept a nul only as the last character in the buffer */
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if (l > 0 && (p = memchr(s, '\0', l)) != NULL) {
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if (p != s + l - 1)
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return NULL;
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l--; /* the nul is put back below */
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}
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if ((r = malloc(l + 1)) == NULL)
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return NULL;
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if (l > 0)
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memcpy(r, s, l);
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r[l] = '\0';
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return r;
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}
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int
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sshbuf_cmp(const struct sshbuf *b, size_t offset,
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const void *s, size_t len)
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{
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if (sshbuf_ptr(b) == NULL)
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return SSH_ERR_INTERNAL_ERROR;
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if (offset > SSHBUF_SIZE_MAX || len > SSHBUF_SIZE_MAX || len == 0)
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return SSH_ERR_INVALID_ARGUMENT;
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if (offset + len > sshbuf_len(b))
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return SSH_ERR_MESSAGE_INCOMPLETE;
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if (timingsafe_bcmp(sshbuf_ptr(b) + offset, s, len) != 0)
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return SSH_ERR_INVALID_FORMAT;
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return 0;
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}
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int
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sshbuf_find(const struct sshbuf *b, size_t start_offset,
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const void *s, size_t len, size_t *offsetp)
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{
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void *p;
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if (offsetp != NULL)
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*offsetp = 0;
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if (sshbuf_ptr(b) == NULL)
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return SSH_ERR_INTERNAL_ERROR;
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if (start_offset > SSHBUF_SIZE_MAX || len > SSHBUF_SIZE_MAX || len == 0)
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return SSH_ERR_INVALID_ARGUMENT;
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if (start_offset > sshbuf_len(b) || start_offset + len > sshbuf_len(b))
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return SSH_ERR_MESSAGE_INCOMPLETE;
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if ((p = memmem(sshbuf_ptr(b) + start_offset,
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sshbuf_len(b) - start_offset, s, len)) == NULL)
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return SSH_ERR_INVALID_FORMAT;
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if (offsetp != NULL)
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*offsetp = (const u_char *)p - sshbuf_ptr(b);
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return 0;
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}
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