Mercurial > dropbear

annotate chachapoly.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 5b701bf529aa
children
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rev   line source
1672
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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 "chachapoly.h"
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30
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31 #if DROPBEAR_CHACHA20POLY1305
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32
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33 #define CHACHA20_KEY_LEN 32
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34 #define CHACHA20_BLOCKSIZE 8
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35 #define POLY1305_KEY_LEN 32
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36 #define POLY1305_TAG_LEN 16
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37
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38 static const struct ltc_cipher_descriptor dummy = {.name = NULL};
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39
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40 static const struct dropbear_hash dropbear_chachapoly_mac =
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41 {NULL, POLY1305_KEY_LEN, POLY1305_TAG_LEN};
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42
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43 const struct dropbear_cipher dropbear_chachapoly =
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44 {&dummy, CHACHA20_KEY_LEN*2, CHACHA20_BLOCKSIZE};
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45
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46 static int dropbear_chachapoly_start(int UNUSED(cipher), const unsigned char* UNUSED(IV),
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47 const unsigned char *key, int keylen,
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48 int UNUSED(num_rounds), dropbear_chachapoly_state *state) {
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49 int err;
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50
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51 TRACE2(("enter dropbear_chachapoly_start"))
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52
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53 if (keylen != CHACHA20_KEY_LEN*2) {
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54 return CRYPT_ERROR;
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55 }
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56
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57 if ((err = chacha_setup(&state->chacha, key,
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58 CHACHA20_KEY_LEN, 20)) != CRYPT_OK) {
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59 return err;
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60 }
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61
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62 if ((err = chacha_setup(&state->header, key + CHACHA20_KEY_LEN,
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63 CHACHA20_KEY_LEN, 20) != CRYPT_OK)) {
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64 return err;
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65 }
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66
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67 TRACE2(("leave dropbear_chachapoly_start"))
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68 return CRYPT_OK;
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69 }
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70
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71 static int dropbear_chachapoly_crypt(unsigned int seq,
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72 const unsigned char *in, unsigned char *out,
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73 unsigned long len, unsigned long taglen,
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74 dropbear_chachapoly_state *state, int direction) {
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75 poly1305_state poly;
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76 unsigned char seqbuf[8], key[POLY1305_KEY_LEN], tag[POLY1305_TAG_LEN];
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77 int err;
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78
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79 TRACE2(("enter dropbear_chachapoly_crypt"))
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80
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81 if (len < 4 || taglen != POLY1305_TAG_LEN) {
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82 return CRYPT_ERROR;
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83 }
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84
1705
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85 STORE64H((uint64_t)seq, seqbuf);
1672
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86 chacha_ivctr64(&state->chacha, seqbuf, sizeof(seqbuf), 0);
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87 if ((err = chacha_keystream(&state->chacha, key, sizeof(key))) != CRYPT_OK) {
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88 return err;
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89 }
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90
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91 poly1305_init(&poly, key, sizeof(key));
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92 if (direction == LTC_DECRYPT) {
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93 poly1305_process(&poly, in, len);
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94 poly1305_done(&poly, tag, &taglen);
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95 if (constant_time_memcmp(in + len, tag, taglen) != 0) {
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96 return CRYPT_ERROR;
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97 }
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98 }
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99
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100 chacha_ivctr64(&state->header, seqbuf, sizeof(seqbuf), 0);
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101 if ((err = chacha_crypt(&state->header, in, 4, out)) != CRYPT_OK) {
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102 return err;
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103 }
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104
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105 chacha_ivctr64(&state->chacha, seqbuf, sizeof(seqbuf), 1);
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106 if ((err = chacha_crypt(&state->chacha, in + 4, len - 4, out + 4)) != CRYPT_OK) {
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107 return err;
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108 }
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109
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110 if (direction == LTC_ENCRYPT) {
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111 poly1305_process(&poly, out, len);
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112 poly1305_done(&poly, out + len, &taglen);
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113 }
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114
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115 TRACE2(("leave dropbear_chachapoly_crypt"))
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116 return CRYPT_OK;
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117 }
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118
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119 static int dropbear_chachapoly_getlength(unsigned int seq,
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120 const unsigned char *in, unsigned int *outlen,
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121 unsigned long len, dropbear_chachapoly_state *state) {
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122 unsigned char seqbuf[8], buf[4];
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123 int err;
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124
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125 TRACE2(("enter dropbear_chachapoly_getlength"))
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126
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127 if (len < sizeof(buf)) {
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128 return CRYPT_ERROR;
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129 }
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130
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131 STORE64H((uint64_t)seq, seqbuf);
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132 chacha_ivctr64(&state->header, seqbuf, sizeof(seqbuf), 0);
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133 if ((err = chacha_crypt(&state->header, in, sizeof(buf), buf)) != CRYPT_OK) {
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134 return err;
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135 }
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136
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137 LOAD32H(*outlen, buf);
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138
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139 TRACE2(("leave dropbear_chachapoly_getlength"))
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140 return CRYPT_OK;
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141 }
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142
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143 const struct dropbear_cipher_mode dropbear_mode_chachapoly =
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144 {(void *)dropbear_chachapoly_start, NULL, NULL,
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145 (void *)dropbear_chachapoly_crypt,
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146 (void *)dropbear_chachapoly_getlength, &dropbear_chachapoly_mac};
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147
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148 #endif /* DROPBEAR_CHACHA20POLY1305 */