Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_sign_hash.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 6dba84798cd5
children
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9 #include "tomcrypt.h"
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10
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11 /**
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12 @file rsa_sign_hash.c
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13 RSA PKCS #1 v1.5 and v2 PSS sign hash, Tom St Denis and Andreas Lange
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14 */
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15
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16 #ifdef LTC_MRSA
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18 /**
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19 PKCS #1 pad then sign
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20 @param in The hash to sign
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21 @param inlen The length of the hash to sign (octets)
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22 @param out [out] The signature
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23 @param outlen [in/out] The max size and resulting size of the signature
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24 @param padding Type of padding (LTC_PKCS_1_PSS, LTC_PKCS_1_V1_5 or LTC_PKCS_1_V1_5_NA1)
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25 @param prng An active PRNG state
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26 @param prng_idx The index of the PRNG desired
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27 @param hash_idx The index of the hash desired
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28 @param saltlen The length of the salt desired (octets)
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29 @param key The private RSA key to use
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30 @return CRYPT_OK if successful
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31 */
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32 int rsa_sign_hash_ex(const unsigned char *in, unsigned long inlen,
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33 unsigned char *out, unsigned long *outlen,
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34 int padding,
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35 prng_state *prng, int prng_idx,
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36 int hash_idx, unsigned long saltlen,
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37 rsa_key *key)
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38 {
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39 unsigned long modulus_bitlen, modulus_bytelen, x, y;
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40 int err;
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42 LTC_ARGCHK(in != NULL);
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43 LTC_ARGCHK(out != NULL);
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44 LTC_ARGCHK(outlen != NULL);
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45 LTC_ARGCHK(key != NULL);
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46
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47 /* valid padding? */
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48 if ((padding != LTC_PKCS_1_V1_5) &&
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49 (padding != LTC_PKCS_1_PSS) &&
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50 (padding != LTC_PKCS_1_V1_5_NA1)) {
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51 return CRYPT_PK_INVALID_PADDING;
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52 }
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53
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54 if (padding == LTC_PKCS_1_PSS) {
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55 /* valid prng ? */
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56 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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57 return err;
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58 }
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59 }
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60
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61 if (padding != LTC_PKCS_1_V1_5_NA1) {
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62 /* valid hash ? */
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63 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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64 return err;
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65 }
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66 }
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67
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68 /* get modulus len in bits */
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69 modulus_bitlen = mp_count_bits((key->N));
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70
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71 /* outlen must be at least the size of the modulus */
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72 modulus_bytelen = mp_unsigned_bin_size((key->N));
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73 if (modulus_bytelen > *outlen) {
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74 *outlen = modulus_bytelen;
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75 return CRYPT_BUFFER_OVERFLOW;
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76 }
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77
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78 if (padding == LTC_PKCS_1_PSS) {
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79 /* PSS pad the key */
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80 x = *outlen;
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81 if ((err = pkcs_1_pss_encode(in, inlen, saltlen, prng, prng_idx,
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82 hash_idx, modulus_bitlen, out, &x)) != CRYPT_OK) {
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83 return err;
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84 }
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85 } else {
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86 /* PKCS #1 v1.5 pad the hash */
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87 unsigned char *tmpin;
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88
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89 if (padding == LTC_PKCS_1_V1_5) {
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90 ltc_asn1_list digestinfo[2], siginfo[2];
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91 /* not all hashes have OIDs... so sad */
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92 if (hash_descriptor[hash_idx].OIDlen == 0) {
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93 return CRYPT_INVALID_ARG;
382
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94 }
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95
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96 /* construct the SEQUENCE
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97 SEQUENCE {
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98 SEQUENCE {hashoid OID
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99 blah NULL
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100 }
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101 hash OCTET STRING
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102 }
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103 */
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104 LTC_SET_ASN1(digestinfo, 0, LTC_ASN1_OBJECT_IDENTIFIER, hash_descriptor[hash_idx].OID, hash_descriptor[hash_idx].OIDlen);
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105 LTC_SET_ASN1(digestinfo, 1, LTC_ASN1_NULL, NULL, 0);
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106 LTC_SET_ASN1(siginfo, 0, LTC_ASN1_SEQUENCE, digestinfo, 2);
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107 LTC_SET_ASN1(siginfo, 1, LTC_ASN1_OCTET_STRING, in, inlen);
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108
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109 /* allocate memory for the encoding */
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110 y = mp_unsigned_bin_size(key->N);
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111 tmpin = XMALLOC(y);
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112 if (tmpin == NULL) {
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113 return CRYPT_MEM;
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114 }
382
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115
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116 if ((err = der_encode_sequence(siginfo, 2, tmpin, &y)) != CRYPT_OK) {
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117 XFREE(tmpin);
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118 return err;
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119 }
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120 } else {
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121 /* set the pointer and data-length to the input values */
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122 tmpin = (unsigned char *)in;
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123 y = inlen;
382
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124 }
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125
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126 x = *outlen;
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127 err = pkcs_1_v1_5_encode(tmpin, y, LTC_PKCS_1_EMSA, modulus_bitlen, NULL, 0, out, &x);
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128
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129 if (padding == LTC_PKCS_1_V1_5) {
382
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130 XFREE(tmpin);
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131 }
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132
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133 if (err != CRYPT_OK) {
382
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134 return err;
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135 }
285
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136 }
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137
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138 /* RSA encode it */
382
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139 return ltc_mp.rsa_me(out, x, out, outlen, PK_PRIVATE, key);
285
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140 }
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141
1435
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142 #endif /* LTC_MRSA */
285
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143
1471
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144 /* ref: $Format:%D$ */
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diff changeset
145 /* git commit: $Format:%H$ */
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146 /* commit time: $Format:%ai$ */