Mercurial > dropbear

annotate gcm.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 5b701bf529aa
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * Copyright (c) 2020 by Vladislav Grishenko
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6 * All rights reserved.
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7 *
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 * of this software and associated documentation files (the "Software"), to deal
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10 * in the Software without restriction, including without limitation the rights
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 * copies of the Software, and to permit persons to whom the Software is
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13 * furnished to do so, subject to the following conditions:
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14 *
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15 * The above copyright notice and this permission notice shall be included in
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16 * all copies or substantial portions of the Software.
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17 *
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 * SOFTWARE. */
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25
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26 #include "includes.h"
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27 #include "algo.h"
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28 #include "dbutil.h"
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29 #include "gcm.h"
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30
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31 #if DROPBEAR_ENABLE_GCM_MODE
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32
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33 #define GHASH_LEN 16
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34
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35 static const struct dropbear_hash dropbear_ghash =
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36 {NULL, 0, GHASH_LEN};
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37
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38 static int dropbear_gcm_start(int cipher, const unsigned char *IV,
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39 const unsigned char *key, int keylen,
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40 int UNUSED(num_rounds), dropbear_gcm_state *state) {
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41 int err;
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42
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43 TRACE2(("enter dropbear_gcm_start"))
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44
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45 if ((err = gcm_init(&state->gcm, cipher, key, keylen)) != CRYPT_OK) {
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46 return err;
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47 }
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48 memcpy(state->iv, IV, GCM_NONCE_LEN);
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49
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50 TRACE2(("leave dropbear_gcm_start"))
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51 return CRYPT_OK;
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52 }
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53
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54 static int dropbear_gcm_crypt(unsigned int UNUSED(seq),
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55 const unsigned char *in, unsigned char *out,
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56 unsigned long len, unsigned long taglen,
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57 dropbear_gcm_state *state, int direction) {
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58 unsigned char *iv, tag[GHASH_LEN];
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59 int i, err;
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60
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61 TRACE2(("enter dropbear_gcm_crypt"))
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62
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63 if (len < 4 || taglen != GHASH_LEN) {
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64 return CRYPT_ERROR;
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65 }
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66
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67 gcm_reset(&state->gcm);
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68
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69 if ((err = gcm_add_iv(&state->gcm,
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70 state->iv, GCM_NONCE_LEN)) != CRYPT_OK) {
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71 return err;
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72 }
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73
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74 if ((err = gcm_add_aad(&state->gcm, in, 4)) != CRYPT_OK) {
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75 return err;
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76 }
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77
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78 if ((err = gcm_process(&state->gcm, (unsigned char *) in + 4,
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79 len - 4, out + 4, direction)) != CRYPT_OK) {
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80 return err;
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81 }
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82
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83 if (direction == LTC_ENCRYPT) {
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84 gcm_done(&state->gcm, out + len, &taglen);
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85 } else {
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86 gcm_done(&state->gcm, tag, &taglen);
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87 if (constant_time_memcmp(in + len, tag, taglen) != 0) {
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88 return CRYPT_ERROR;
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89 }
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90 }
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91
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92 /* increment invocation counter */
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93 iv = state->iv + GCM_IVFIX_LEN;
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94 for (i = GCM_IVCTR_LEN - 1; i >= 0 && ++iv[i] == 0; i--);
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95
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96 TRACE2(("leave dropbear_gcm_crypt"))
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97 return CRYPT_OK;
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98 }
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99
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100 static int dropbear_gcm_getlength(unsigned int UNUSED(seq),
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101 const unsigned char *in, unsigned int *outlen,
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102 unsigned long len, dropbear_gcm_state* UNUSED(state)) {
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103 TRACE2(("enter dropbear_gcm_getlength"))
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104
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105 if (len < 4) {
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106 return CRYPT_ERROR;
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107 }
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108
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109 LOAD32H(*outlen, in);
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110
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111 TRACE2(("leave dropbear_gcm_getlength"))
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112 return CRYPT_OK;
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113 }
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114
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115 const struct dropbear_cipher_mode dropbear_mode_gcm =
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116 {(void *)dropbear_gcm_start, NULL, NULL,
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117 (void *)dropbear_gcm_crypt,
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118 (void *)dropbear_gcm_getlength, &dropbear_ghash};
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119
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120 #endif /* DROPBEAR_ENABLE_GCM_MODE */