Mercurial > dropbear

annotate libtomcrypt/src/misc/pkcs5/pkcs_5_1.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 pkcs_5_1.c
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13 PKCS #5, Algorithm #1, Tom St Denis
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14 */
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15 #ifdef LTC_PKCS_5
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16 /**
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17 Execute PKCS #5 v1 in strict or OpenSSL EVP_BytesToKey()-compat mode.
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18
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19 PKCS#5 v1 specifies that the output key length can be no larger than
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20 the hash output length. OpenSSL unilaterally extended that by repeating
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21 the hash process on a block-by-block basis for as long as needed to make
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22 bigger keys. If you want to be compatible with KDF for e.g. "openssl enc",
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23 you'll want that.
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24
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25 If you want strict PKCS behavior, turn openssl_compat off. Or (more
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26 likely), use one of the convenience functions below.
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27
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28 @param password The password (or key)
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29 @param password_len The length of the password (octet)
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30 @param salt The salt (or nonce) which is 8 octets long
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31 @param iteration_count The PKCS #5 v1 iteration count
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32 @param hash_idx The index of the hash desired
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33 @param out [out] The destination for this algorithm
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34 @param outlen [in/out] The max size and resulting size of the algorithm output
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35 @param openssl_compat [in] Whether or not to grow the key to the buffer size ala OpenSSL
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36 @return CRYPT_OK if successful
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37 */
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38 static int _pkcs_5_alg1_common(const unsigned char *password,
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39 unsigned long password_len,
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40 const unsigned char *salt,
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41 int iteration_count, int hash_idx,
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42 unsigned char *out, unsigned long *outlen,
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43 int openssl_compat)
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44 {
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45 int err;
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46 unsigned long x;
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47 hash_state *md;
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48 unsigned char *buf;
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49 /* Storage vars in case we need to support > hashsize (OpenSSL compat) */
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50 unsigned long block = 0, iter;
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51 /* How many bytes to put in the outbut buffer (convenience calc) */
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52 unsigned long outidx = 0, nb = 0;
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53
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54 LTC_ARGCHK(password != NULL);
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55 LTC_ARGCHK(salt != NULL);
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56 LTC_ARGCHK(out != NULL);
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57 LTC_ARGCHK(outlen != NULL);
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58
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59 /* test hash IDX */
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60 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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61 return err;
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62 }
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63
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64 /* allocate memory */
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65 md = XMALLOC(sizeof(hash_state));
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66 buf = XMALLOC(MAXBLOCKSIZE);
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67 if (md == NULL || buf == NULL) {
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68 if (md != NULL) {
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69 XFREE(md);
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70 }
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71 if (buf != NULL) {
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72 XFREE(buf);
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73 }
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74 return CRYPT_MEM;
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75 }
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76
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77 while(block * hash_descriptor[hash_idx].hashsize < *outlen) {
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78
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79 /* hash initial (maybe previous hash) + password + salt */
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80 if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) {
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81 goto LBL_ERR;
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82 }
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83 /* in OpenSSL mode, we first hash the previous result for blocks 2-n */
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84 if (openssl_compat && block) {
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85 if ((err = hash_descriptor[hash_idx].process(md, buf, hash_descriptor[hash_idx].hashsize)) != CRYPT_OK) {
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86 goto LBL_ERR;
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87 }
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88 }
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89 if ((err = hash_descriptor[hash_idx].process(md, password, password_len)) != CRYPT_OK) {
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90 goto LBL_ERR;
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91 }
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92 if ((err = hash_descriptor[hash_idx].process(md, salt, 8)) != CRYPT_OK) {
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93 goto LBL_ERR;
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94 }
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95 if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) {
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96 goto LBL_ERR;
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97 }
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98
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99 iter = iteration_count;
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100 while (--iter) {
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101 /* code goes here. */
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102 x = MAXBLOCKSIZE;
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103 if ((err = hash_memory(hash_idx, buf, hash_descriptor[hash_idx].hashsize, buf, &x)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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104 goto LBL_ERR;
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diff changeset
105 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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106 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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107
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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108 /* limit the size of the copy to however many bytes we have left in
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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109 the output buffer (and how many bytes we have to copy) */
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110 outidx = block*hash_descriptor[hash_idx].hashsize;
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111 nb = hash_descriptor[hash_idx].hashsize;
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diff changeset
112 if(outidx+nb > *outlen)
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diff changeset
113 nb = *outlen - outidx;
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114 if(nb > 0)
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115 XMEMCPY(out+outidx, buf, nb);
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116
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117 block++;
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118 if (!openssl_compat)
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119 break;
285
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120 }
1471
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121 /* In strict mode, we always return the hashsize, in compat we filled it
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122 as much as was requested, so we leave it alone. */
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123 if(!openssl_compat)
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124 *outlen = hash_descriptor[hash_idx].hashsize;
285
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125
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126 err = CRYPT_OK;
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127 LBL_ERR:
1471
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128 #ifdef LTC_CLEAN_STACK
285
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129 zeromem(buf, MAXBLOCKSIZE);
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130 zeromem(md, sizeof(hash_state));
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131 #endif
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132
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diff changeset
133 XFREE(buf);
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134 XFREE(md);
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135
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136 return err;
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137 }
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diff changeset
138
1471
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139 /**
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140 Execute PKCS #5 v1 - Strict mode (no OpenSSL-compatible extension)
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141 @param password The password (or key)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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142 @param password_len The length of the password (octet)
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143 @param salt The salt (or nonce) which is 8 octets long
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144 @param iteration_count The PKCS #5 v1 iteration count
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145 @param hash_idx The index of the hash desired
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146 @param out [out] The destination for this algorithm
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147 @param outlen [in/out] The max size and resulting size of the algorithm output
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148 @return CRYPT_OK if successful
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diff changeset
149 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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150 int pkcs_5_alg1(const unsigned char *password, unsigned long password_len,
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diff changeset
151 const unsigned char *salt,
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152 int iteration_count, int hash_idx,
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153 unsigned char *out, unsigned long *outlen)
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154 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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155 return _pkcs_5_alg1_common(password, password_len, salt, iteration_count,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
156 hash_idx, out, outlen, 0);
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diff changeset
157 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
158
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
159 /**
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diff changeset
160 Execute PKCS #5 v1 - OpenSSL-extension-compatible mode
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
161
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
162 Use this one if you need to derive keys as "openssl enc" does by default.
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
163 OpenSSL (for better or worse), uses MD5 as the hash and iteration_count=1.
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diff changeset
164 @param password The password (or key)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
165 @param password_len The length of the password (octet)
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diff changeset
166 @param salt The salt (or nonce) which is 8 octets long
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diff changeset
167 @param iteration_count The PKCS #5 v1 iteration count
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diff changeset
168 @param hash_idx The index of the hash desired
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diff changeset
169 @param out [out] The destination for this algorithm
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diff changeset
170 @param outlen [in/out] The max size and resulting size of the algorithm output
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
171 @return CRYPT_OK if successful
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
172 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
173 int pkcs_5_alg1_openssl(const unsigned char *password,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
174 unsigned long password_len,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
175 const unsigned char *salt,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
176 int iteration_count, int hash_idx,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
177 unsigned char *out, unsigned long *outlen)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
178 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
179 return _pkcs_5_alg1_common(password, password_len, salt, iteration_count,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
180 hash_idx, out, outlen, 1);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
181 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
182
285
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diff changeset
183 #endif
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diff changeset
184
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
185 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
186 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
187 /* commit time: $Format:%ai$ */