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annotate libtommath/bn_mp_prime_rand.c @ 1930:299f4f19ba19

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Add /usr/sbin and /sbin to default root PATH When dropbear is used in a very restricted environment (such as in a initrd), the default user shell is often also very restricted and doesn't take care of setting the PATH so the user ends up with the PATH set by dropbear. Unfortunately, dropbear always sets "/usr/bin:/bin" as default PATH even for the root user which should have /usr/sbin and /sbin too. For a concrete instance of this problem, see the "Remote Unlocking" section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/ It speaks of a bug in the initramfs script because it's written "blkid" instead of "/sbin/blkid"... this is just because the scripts from the initramfs do not expect to have a PATH without the sbin directories and because dropbear is not setting the PATH appropriately for the root user. I'm thus suggesting to use the attached patch to fix this misbehaviour (I did not test it, but it's easy enough). It might seem anecdotic but multiple Kali users have been bitten by this. From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author Raphael Hertzog <hertzog@debian.org>
date Mon, 09 Jul 2018 16:27:53 +0200
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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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
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6 /* makes a truly random prime of a given size (bits),
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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7 *
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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
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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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 }
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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;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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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;
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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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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 }
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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? */
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85 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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86 goto error;
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87 }
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Steffen Jaeckel <s@jaeckel.eu>
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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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diff changeset
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) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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103 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
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104 }
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105 }
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106 } while (res == MP_NO);
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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107
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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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) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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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) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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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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parents:
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122 }
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parents:
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123
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124 static int s_mp_rand_cb(unsigned char *dst, int len, void *dat)
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parents:
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125 {
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126 (void)dat;
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127 if (len <= 0) {
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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) {
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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
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136 mp_err mp_prime_rand(mp_int *a, int t, int size, int flags)
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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