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annotate libtomcrypt/src/pk/rsa/rsa_import_pkcs8.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 e9dba7abd939
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
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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_import_pkcs8.c
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13 Import a PKCS RSA key
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14 */
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15
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16 #ifdef LTC_MRSA
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17
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18 /* Public-Key Cryptography Standards (PKCS) #8:
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19 * Private-Key Information Syntax Specification Version 1.2
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20 * https://tools.ietf.org/html/rfc5208
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21 *
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22 * PrivateKeyInfo ::= SEQUENCE {
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23 * version Version,
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24 * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
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25 * privateKey PrivateKey,
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26 * attributes [0] IMPLICIT Attributes OPTIONAL }
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27 * where:
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28 * - Version ::= INTEGER
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29 * - PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
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30 * - PrivateKey ::= OCTET STRING
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31 * - Attributes ::= SET OF Attribute
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32 *
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33 * EncryptedPrivateKeyInfo ::= SEQUENCE {
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34 * encryptionAlgorithm EncryptionAlgorithmIdentifier,
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35 * encryptedData EncryptedData }
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36 * where:
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37 * - EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
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38 * - EncryptedData ::= OCTET STRING
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39 */
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40
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41 /**
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42 Import an RSAPublicKey or RSAPrivateKey in PKCS#8 format
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43 @param in The packet to import from
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44 @param inlen It's length (octets)
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45 @param passwd The password for decrypting privkey (NOT SUPPORTED YET)
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46 @param passwdlen Password's length (octets)
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47 @param key [out] Destination for newly imported key
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48 @return CRYPT_OK if successful, upon error allocated memory is freed
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49 */
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50 int rsa_import_pkcs8(const unsigned char *in, unsigned long inlen,
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51 const void *passwd, unsigned long passwdlen,
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52 rsa_key *key)
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53 {
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54 int err;
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55 void *zero, *iter;
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56 unsigned char *buf1 = NULL, *buf2 = NULL;
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57 unsigned long buf1len, buf2len;
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58 unsigned long oid[16];
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59 oid_st rsaoid;
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60 ltc_asn1_list alg_seq[2], top_seq[3];
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61 ltc_asn1_list alg_seq_e[2], key_seq_e[2], top_seq_e[2];
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62 unsigned char *decrypted = NULL;
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63 unsigned long decryptedlen;
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64
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65 LTC_ARGCHK(in != NULL);
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66 LTC_ARGCHK(key != NULL);
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67 LTC_ARGCHK(ltc_mp.name != NULL);
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68
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69 /* get RSA alg oid */
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70 err = pk_get_oid(PKA_RSA, &rsaoid);
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71 if (err != CRYPT_OK) { goto LBL_NOFREE; }
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72
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73 /* alloc buffers */
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74 buf1len = inlen; /* approx. */
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75 buf1 = XMALLOC(buf1len);
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76 if (buf1 == NULL) { err = CRYPT_MEM; goto LBL_NOFREE; }
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77 buf2len = inlen; /* approx. */
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78 buf2 = XMALLOC(buf2len);
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79 if (buf2 == NULL) { err = CRYPT_MEM; goto LBL_FREE1; }
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80
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81 /* init key */
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82 err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP, &key->p, &key->q, &zero, &iter, NULL);
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83 if (err != CRYPT_OK) { goto LBL_FREE2; }
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84
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85 /* try to decode encrypted priv key */
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86 LTC_SET_ASN1(key_seq_e, 0, LTC_ASN1_OCTET_STRING, buf1, buf1len);
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87 LTC_SET_ASN1(key_seq_e, 1, LTC_ASN1_INTEGER, iter, 1UL);
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88 LTC_SET_ASN1(alg_seq_e, 0, LTC_ASN1_OBJECT_IDENTIFIER, oid, 16UL);
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89 LTC_SET_ASN1(alg_seq_e, 1, LTC_ASN1_SEQUENCE, key_seq_e, 2UL);
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90 LTC_SET_ASN1(top_seq_e, 0, LTC_ASN1_SEQUENCE, alg_seq_e, 2UL);
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91 LTC_SET_ASN1(top_seq_e, 1, LTC_ASN1_OCTET_STRING, buf2, buf2len);
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92 err=der_decode_sequence(in, inlen, top_seq_e, 2UL);
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93 if (err == CRYPT_OK) {
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94 LTC_UNUSED_PARAM(passwd);
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95 LTC_UNUSED_PARAM(passwdlen);
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96 /* XXX: TODO encrypted pkcs8 not implemented yet */
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97 /* fprintf(stderr, "decrypt: iter=%ld salt.len=%ld encdata.len=%ld\n", mp_get_int(iter), key_seq_e[0].size, top_seq_e[1].size); */
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98 err = CRYPT_PK_INVALID_TYPE;
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99 goto LBL_ERR;
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100 }
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101 else {
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102 decrypted = (unsigned char *)in;
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103 decryptedlen = inlen;
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104 }
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105
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106 /* try to decode unencrypted priv key */
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107 LTC_SET_ASN1(alg_seq, 0, LTC_ASN1_OBJECT_IDENTIFIER, oid, 16UL);
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108 LTC_SET_ASN1(alg_seq, 1, LTC_ASN1_NULL, NULL, 0UL);
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109 LTC_SET_ASN1(top_seq, 0, LTC_ASN1_INTEGER, zero, 1UL);
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110 LTC_SET_ASN1(top_seq, 1, LTC_ASN1_SEQUENCE, alg_seq, 2UL);
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111 LTC_SET_ASN1(top_seq, 2, LTC_ASN1_OCTET_STRING, buf1, buf1len);
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112 err=der_decode_sequence(decrypted, decryptedlen, top_seq, 3UL);
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113 if (err != CRYPT_OK) { goto LBL_ERR; }
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114
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115 /* check alg oid */
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116 if ((alg_seq[0].size != rsaoid.OIDlen) ||
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117 XMEMCMP(rsaoid.OID, alg_seq[0].data, rsaoid.OIDlen * sizeof(rsaoid.OID[0])) != 0) {
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118 err = CRYPT_PK_INVALID_TYPE;
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119 goto LBL_ERR;
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120 }
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121
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122 err = der_decode_sequence_multi(buf1, top_seq[2].size,
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123 LTC_ASN1_INTEGER, 1UL, zero,
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124 LTC_ASN1_INTEGER, 1UL, key->N,
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125 LTC_ASN1_INTEGER, 1UL, key->e,
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126 LTC_ASN1_INTEGER, 1UL, key->d,
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127 LTC_ASN1_INTEGER, 1UL, key->p,
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128 LTC_ASN1_INTEGER, 1UL, key->q,
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129 LTC_ASN1_INTEGER, 1UL, key->dP,
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130 LTC_ASN1_INTEGER, 1UL, key->dQ,
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131 LTC_ASN1_INTEGER, 1UL, key->qP,
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132 LTC_ASN1_EOL, 0UL, NULL);
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133 if (err != CRYPT_OK) { goto LBL_ERR; }
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134 key->type = PK_PRIVATE;
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135 err = CRYPT_OK;
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136 goto LBL_FREE2;
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137
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138 LBL_ERR:
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139 rsa_free(key);
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140 LBL_FREE2:
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141 mp_clear_multi(iter, zero, NULL);
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142 XFREE(buf2);
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143 LBL_FREE1:
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144 XFREE(buf1);
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145 LBL_NOFREE:
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146 return err;
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147 }
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148
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149 #endif /* LTC_MRSA */
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150
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151 /* ref: $Format:%D$ */
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152 /* git commit: $Format:%H$ */
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153 /* commit time: $Format:%ai$ */