Mercurial > dovecot > core-2.2

annotate src/lib-ntlm/ntlm-encrypt.c @ 23017:c1d36f2575c7 default tip

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lib-imap: Fix "Don't accept strings with NULs" cherry-pick
author Timo Sirainen <timo.sirainen@open-xchange.com>
date Thu, 29 Aug 2019 09:55:25 +0300
parents 8802322d7257
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * NTLM and NTLMv2 hash generation.
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3 *
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4 * Copyright (c) 2004 Andrey Panin <pazke@donpac.ru>
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5 *
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f8d37e26a2b3 Relicensed dovecot-auth to MIT.
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6 * This software is released under the MIT license.
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7 */
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8
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9 #include "lib.h"
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10 #include "buffer.h"
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11 #include "compat.h"
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12 #include "safe-memset.h"
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13 #include "md4.h"
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14 #include "md5.h"
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15 #include "hmac.h"
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16 #include "ntlm.h"
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17 #include "ntlm-des.h"
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18
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19 #include <ctype.h>
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20
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21 static unsigned char *
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22 t_unicode_str(const char *src, bool ucase, size_t *size)
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23 {
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24 buffer_t *wstr;
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25
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26 wstr = buffer_create_dynamic(unsafe_data_stack_pool, 32);
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27 for ( ; *src; src++) {
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28 buffer_append_c(wstr, ucase ? i_toupper(*src) : *src);
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29 buffer_append_c(wstr, '\0');
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30 }
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31
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32 *size = buffer_get_used_size(wstr);
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33 return buffer_free_without_data(&wstr);
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34 }
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35
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36 void lm_hash(const char *passwd, unsigned char hash[LM_HASH_SIZE])
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37 {
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38 static const unsigned char lm_magic[8] = "KGS!@#$%";
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39 unsigned char buffer[14];
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40 unsigned int i;
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41
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42 strncpy((char *)buffer, passwd, sizeof(buffer));
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43
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44 for (i = 0; i < sizeof(buffer); i++)
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45 buffer[i] = i_toupper(buffer[i]);
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46
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47 deshash(hash, buffer, lm_magic);
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48 deshash(hash + 8, buffer + 7, lm_magic);
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49
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50 safe_memset(buffer, 0, sizeof(buffer));
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51 }
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52
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53 void ntlm_v1_hash(const char *passwd, unsigned char hash[NTLMSSP_HASH_SIZE])
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54 {
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55 size_t len;
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56 void *wpwd = t_unicode_str(passwd, 0, &len);
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57
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58 md4_get_digest(wpwd, len, hash);
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59
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60 safe_memset(wpwd, 0, len);
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61 }
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62
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63 static void
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64 hmac_md5_ucs2le_string_ucase(struct hmac_context *ctx, const char *str)
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65 {
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66 size_t len;
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67 unsigned char *wstr = t_unicode_str(str, 1, &len);
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68
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69 hmac_update(ctx, wstr, len);
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70 }
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71
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72 static void ATTR_NULL(2)
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73 ntlm_v2_hash(const char *user, const char *target,
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74 const unsigned char *hash_v1,
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75 unsigned char hash[NTLMSSP_V2_HASH_SIZE])
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76 {
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77 struct hmac_context ctx;
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78
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79 hmac_init(&ctx, hash_v1, NTLMSSP_HASH_SIZE, &hash_method_md5);
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80 hmac_md5_ucs2le_string_ucase(&ctx, user);
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81 if (target != NULL)
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82 hmac_md5_ucs2le_string_ucase(&ctx, target);
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83 hmac_final(&ctx, hash);
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84 }
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85
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86 void
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87 ntlmssp_v1_response(const unsigned char *hash,
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88 const unsigned char *challenge,
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89 unsigned char response[NTLMSSP_RESPONSE_SIZE])
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90 {
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91 unsigned char des_hash[NTLMSSP_DES_KEY_LENGTH * 3];
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92
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93 memcpy(des_hash, hash, NTLMSSP_HASH_SIZE);
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94 memset(des_hash + NTLMSSP_HASH_SIZE, 0,
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95 sizeof(des_hash) - NTLMSSP_HASH_SIZE);
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96
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97 deshash(response, des_hash, challenge);
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98 deshash(response + 8, des_hash + 7, challenge);
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99 deshash(response + 16, des_hash + 14, challenge);
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100
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101 safe_memset(des_hash, 0, sizeof(des_hash));
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102 }
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103
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104 void
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105 ntlmssp2_response(const unsigned char *hash,
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106 const unsigned char *server_challenge,
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107 const unsigned char *client_challenge,
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108 unsigned char response[NTLMSSP_RESPONSE_SIZE])
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109 {
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110 struct md5_context ctx;
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111 unsigned char session_hash[MD5_RESULTLEN];
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112
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113 md5_init(&ctx);
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114 md5_update(&ctx, server_challenge, NTLMSSP_CHALLENGE_SIZE);
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115 md5_update(&ctx, client_challenge, NTLMSSP_CHALLENGE_SIZE);
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116 md5_final(&ctx, session_hash);
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117
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118 ntlmssp_v1_response(hash, session_hash, response);
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119 }
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120
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121 void
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122 ntlmssp_v2_response(const char *user, const char *target,
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123 const unsigned char *hash_v1,
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124 const unsigned char *challenge,
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125 const unsigned char *blob, size_t blob_size,
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126 unsigned char response[NTLMSSP_V2_RESPONSE_SIZE])
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127 {
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128 struct hmac_context ctx;
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129 unsigned char hash[NTLMSSP_V2_HASH_SIZE];
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130
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131 ntlm_v2_hash(user, target, hash_v1, hash);
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132
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133 hmac_init(&ctx, hash, NTLMSSP_V2_HASH_SIZE, &hash_method_md5);
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134 hmac_update(&ctx, challenge, NTLMSSP_CHALLENGE_SIZE);
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135 hmac_update(&ctx, blob, blob_size);
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136 hmac_final(&ctx, response);
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137
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138 safe_memset(hash, 0, sizeof(hash));
2377
8f5be0be3199 NTLM authentication. Patch by Andrey Panin
Timo Sirainen <tss@iki.fi>
parents:
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139 }