Mercurial > dropbear

annotate libtommath/bn_s_mp_rand_platform.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 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1692
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1 #include "tommath_private.h"
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2 #ifdef BN_S_MP_RAND_PLATFORM_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 /* First the OS-specific special cases
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7 * - *BSD
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8 * - Windows
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9 */
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10 #if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
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11 #define BN_S_READ_ARC4RANDOM_C
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12 static mp_err s_read_arc4random(void *p, size_t n)
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13 {
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14 arc4random_buf(p, n);
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15 return MP_OKAY;
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16 }
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17 #endif
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18
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19 #if defined(_WIN32) || defined(_WIN32_WCE)
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20 #define BN_S_READ_WINCSP_C
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21
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22 #ifndef _WIN32_WINNT
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23 #define _WIN32_WINNT 0x0400
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24 #endif
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25 #ifdef _WIN32_WCE
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26 #define UNDER_CE
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27 #define ARM
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28 #endif
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29
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30 #define WIN32_LEAN_AND_MEAN
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31 #include <windows.h>
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32 #include <wincrypt.h>
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33
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34 static mp_err s_read_wincsp(void *p, size_t n)
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35 {
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36 static HCRYPTPROV hProv = 0;
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37 if (hProv == 0) {
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38 HCRYPTPROV h = 0;
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39 if (!CryptAcquireContext(&h, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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40 (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) &&
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41 !CryptAcquireContext(&h, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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42 CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET)) {
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43 return MP_ERR;
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44 }
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45 hProv = h;
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46 }
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47 return CryptGenRandom(hProv, (DWORD)n, (BYTE *)p) == TRUE ? MP_OKAY : MP_ERR;
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48 }
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49 #endif /* WIN32 */
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50
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51 #if !defined(BN_S_READ_WINCSP_C) && defined(__linux__) && defined(__GLIBC_PREREQ)
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52 #if __GLIBC_PREREQ(2, 25)
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53 #define BN_S_READ_GETRANDOM_C
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54 #include <sys/random.h>
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55 #include <errno.h>
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56
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57 static mp_err s_read_getrandom(void *p, size_t n)
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58 {
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59 char *q = (char *)p;
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60 while (n > 0u) {
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61 ssize_t ret = getrandom(q, n, 0);
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62 if (ret < 0) {
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63 if (errno == EINTR) {
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64 continue;
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65 }
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66 return MP_ERR;
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67 }
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68 q += ret;
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69 n -= (size_t)ret;
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70 }
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71 return MP_OKAY;
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72 }
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73 #endif
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74 #endif
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75
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76 /* We assume all platforms besides windows provide "/dev/urandom".
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77 * In case yours doesn't, define MP_NO_DEV_URANDOM at compile-time.
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78 */
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79 #if !defined(BN_S_READ_WINCSP_C) && !defined(MP_NO_DEV_URANDOM)
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80 #define BN_S_READ_URANDOM_C
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81 #ifndef MP_DEV_URANDOM
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82 #define MP_DEV_URANDOM "/dev/urandom"
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83 #endif
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84 #include <fcntl.h>
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85 #include <errno.h>
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86 #include <unistd.h>
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87
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88 static mp_err s_read_urandom(void *p, size_t n)
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89 {
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90 int fd;
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91 char *q = (char *)p;
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92
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93 do {
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94 fd = open(MP_DEV_URANDOM, O_RDONLY);
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95 } while ((fd == -1) && (errno == EINTR));
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96 if (fd == -1) return MP_ERR;
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97
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98 while (n > 0u) {
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99 ssize_t ret = read(fd, p, n);
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100 if (ret < 0) {
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101 if (errno == EINTR) {
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102 continue;
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103 }
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104 close(fd);
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105 return MP_ERR;
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106 }
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107 q += ret;
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108 n -= (size_t)ret;
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109 }
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110
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111 close(fd);
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112 return MP_OKAY;
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113 }
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114 #endif
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115
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116 #if defined(MP_PRNG_ENABLE_LTM_RNG)
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117 #define BN_S_READ_LTM_RNG
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118 unsigned long (*ltm_rng)(unsigned char *out, unsigned long outlen, void (*callback)(void));
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119 void (*ltm_rng_callback)(void);
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120
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121 static mp_err s_read_ltm_rng(void *p, size_t n)
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122 {
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123 unsigned long res;
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124 if (ltm_rng == NULL) return MP_ERR;
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125 res = ltm_rng(p, n, ltm_rng_callback);
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126 if (res != n) return MP_ERR;
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127 return MP_OKAY;
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128 }
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129 #endif
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130
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131 mp_err s_read_arc4random(void *p, size_t n);
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132 mp_err s_read_wincsp(void *p, size_t n);
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133 mp_err s_read_getrandom(void *p, size_t n);
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134 mp_err s_read_urandom(void *p, size_t n);
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135 mp_err s_read_ltm_rng(void *p, size_t n);
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136
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137 mp_err s_mp_rand_platform(void *p, size_t n)
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138 {
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139 mp_err err = MP_ERR;
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140 if ((err != MP_OKAY) && MP_HAS(S_READ_ARC4RANDOM)) err = s_read_arc4random(p, n);
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141 if ((err != MP_OKAY) && MP_HAS(S_READ_WINCSP)) err = s_read_wincsp(p, n);
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142 if ((err != MP_OKAY) && MP_HAS(S_READ_GETRANDOM)) err = s_read_getrandom(p, n);
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143 if ((err != MP_OKAY) && MP_HAS(S_READ_URANDOM)) err = s_read_urandom(p, n);
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144 if ((err != MP_OKAY) && MP_HAS(S_READ_LTM_RNG)) err = s_read_ltm_rng(p, n);
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145 return err;
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146 }
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147
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148 #endif