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annotate libtommath/bn_mp_prime_rand.c @ 1788:1fc0012b9c38

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Fix handling of replies to global requests (#112) The current code assumes that all global requests want / need a reply. This isn't always true and the request itself indicates if it wants a reply or not. It causes a specific problem with [email protected] messages. These are sent by OpenSSH after authentication to inform the client of potential other host keys for the host. This can be used to add a new type of host key or to rotate host keys. The initial information message from the server is sent as a global request, but with want_reply set to false. This means that the server doesn't expect an answer to this message. Instead the client needs to send a prove request as a reply if it wants to receive proof of ownership for the host keys. The bug doesn't cause any current problems with due to how OpenSSH treats receiving the failure message. It instead treats it as a keepalive message and further ignores it. Arguably this is a protocol violation though of Dropbear and it is only accidental that it doesn't cause a problem with OpenSSH. The bug was found when adding host keys support to libssh, which is more strict protocol wise and treats the unexpected failure message an error, also see https://gitlab.com/libssh/libssh-mirror/-/merge_requests/145 for more information. The fix here is to honor the want_reply flag in the global request and to only send a reply if the other side expects a reply.
author Dirkjan Bussink <d.bussink@gmail.com>
date Thu, 10 Dec 2020 16:13:13 +0100
parents 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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diff changeset
1 #include "tommath_private.h"
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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2 #ifdef BN_MP_PRIME_RAND_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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5
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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6 /* makes a truly random prime of a given size (bits),
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diff changeset
7 *
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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8 * Flags are as follows:
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9 *
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10 * MP_PRIME_BBS - make prime congruent to 3 mod 4
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11 * MP_PRIME_SAFE - make sure (p-1)/2 is prime as well (implies MP_PRIME_BBS)
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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12 * MP_PRIME_2MSB_ON - make the 2nd highest bit one
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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13 *
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14 * You have to supply a callback which fills in a buffer with random bytes. "dat" is a parameter you can
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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diff changeset
15 * have passed to the callback (e.g. a state or something). This function doesn't use "dat" itself
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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16 * so it can be NULL
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17 *
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18 */
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19
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20 /* This is possibly the mother of all prime generation functions, muahahahahaha! */
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21 mp_err s_mp_prime_random_ex(mp_int *a, int t, int size, int flags, private_mp_prime_callback cb, void *dat)
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22 {
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23 unsigned char *tmp, maskAND, maskOR_msb, maskOR_lsb;
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24 int bsize, maskOR_msb_offset;
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25 mp_bool res;
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26 mp_err err;
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27
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28 /* sanity check the input */
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29 if ((size <= 1) || (t <= 0)) {
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30 return MP_VAL;
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31 }
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32
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33 /* MP_PRIME_SAFE implies MP_PRIME_BBS */
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34 if ((flags & MP_PRIME_SAFE) != 0) {
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35 flags |= MP_PRIME_BBS;
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36 }
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37
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38 /* calc the byte size */
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39 bsize = (size>>3) + ((size&7)?1:0);
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40
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41 /* we need a buffer of bsize bytes */
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42 tmp = (unsigned char *) MP_MALLOC((size_t)bsize);
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43 if (tmp == NULL) {
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44 return MP_MEM;
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45 }
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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46
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47 /* calc the maskAND value for the MSbyte*/
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48 maskAND = ((size&7) == 0) ? 0xFFu : (unsigned char)(0xFFu >> (8 - (size & 7)));
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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49
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50 /* calc the maskOR_msb */
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51 maskOR_msb = 0;
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52 maskOR_msb_offset = ((size & 7) == 1) ? 1 : 0;
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53 if ((flags & MP_PRIME_2MSB_ON) != 0) {
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54 maskOR_msb |= (unsigned char)(0x80 >> ((9 - size) & 7));
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55 }
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56
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57 /* get the maskOR_lsb */
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58 maskOR_lsb = 1u;
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59 if ((flags & MP_PRIME_BBS) != 0) {
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60 maskOR_lsb |= 3u;
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61 }
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62
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63 do {
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64 /* read the bytes */
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65 if (cb(tmp, bsize, dat) != bsize) {
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66 err = MP_VAL;
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67 goto error;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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68 }
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69
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70 /* work over the MSbyte */
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71 tmp[0] &= maskAND;
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72 tmp[0] |= (unsigned char)(1 << ((size - 1) & 7));
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73
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74 /* mix in the maskORs */
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75 tmp[maskOR_msb_offset] |= maskOR_msb;
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76 tmp[bsize-1] |= maskOR_lsb;
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diff changeset
77
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78 /* read it in */
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79 /* TODO: casting only for now until all lengths have been changed to the type "size_t"*/
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diff changeset
80 if ((err = mp_from_ubin(a, tmp, (size_t)bsize)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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81 goto error;
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82 }
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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83
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
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84 /* is it prime? */
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
diff changeset
85 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
86 goto error;
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87 }
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diff changeset
88 if (res == MP_NO) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
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89 continue;
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Steffen Jaeckel <s@jaeckel.eu>
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90 }
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91
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92 if ((flags & MP_PRIME_SAFE) != 0) {
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93 /* see if (a-1)/2 is prime */
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94 if ((err = mp_sub_d(a, 1uL, a)) != MP_OKAY) {
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95 goto error;
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96 }
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97 if ((err = mp_div_2(a, a)) != MP_OKAY) {
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98 goto error;
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99 }
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diff changeset
100
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101 /* is it prime? */
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102 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) {
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103 goto error;
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104 }
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105 }
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106 } while (res == MP_NO);
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107
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108 if ((flags & MP_PRIME_SAFE) != 0) {
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109 /* restore a to the original value */
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110 if ((err = mp_mul_2(a, a)) != MP_OKAY) {
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111 goto error;
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112 }
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113 if ((err = mp_add_d(a, 1uL, a)) != MP_OKAY) {
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114 goto error;
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115 }
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116 }
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117
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118 err = MP_OKAY;
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119 error:
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120 MP_FREE_BUFFER(tmp, (size_t)bsize);
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121 return err;
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Steffen Jaeckel <s@jaeckel.eu>
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122 }
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parents:
diff changeset
123
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diff changeset
124 static int s_mp_rand_cb(unsigned char *dst, int len, void *dat)
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
125 {
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126 (void)dat;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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127 if (len <= 0) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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128 return len;
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129 }
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130 if (s_mp_rand_source(dst, (size_t)len) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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131 return 0;
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132 }
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133 return len;
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134 }
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135
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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136 mp_err mp_prime_rand(mp_int *a, int t, int size, int flags)
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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137 {
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138 return s_mp_prime_random_ex(a, t, size, flags, s_mp_rand_cb, NULL);
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139 }
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140
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141 #endif