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annotate src/core/ngx_crypt.c @ 5034:e4441ebe05d5

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Added support for {SHA} passwords (ticket #50). Note: use of {SHA} passwords is discouraged as {SHA} password scheme is vulnerable to attacks using rainbow tables. Use of {SSHA}, $apr1$ or crypt() algorithms as supported by OS is recommended instead. The {SHA} password scheme support is added to avoid the need of changing the scheme recorded in password files from {SHA} to {SSHA} because such a change hides security problem with {SHA} passwords. Patch by Louis Opter, with minor changes.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 07 Feb 2013 12:09:56 +0000
parents 63dff7943fc7
children 2d947c2e3ea1
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1
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2 /*
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3 * Copyright (C) Maxim Dounin
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4 */
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5
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_crypt.h>
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10 #include <ngx_md5.h>
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11 #if (NGX_HAVE_SHA1)
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12 #include <ngx_sha1.h>
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13 #endif
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15
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16 #if (NGX_CRYPT)
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17
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18 static ngx_int_t ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt,
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19 u_char **encrypted);
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20 static ngx_int_t ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt,
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21 u_char **encrypted);
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23 #if (NGX_HAVE_SHA1)
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24
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25 static ngx_int_t ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt,
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26 u_char **encrypted);
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27 static ngx_int_t ngx_crypt_sha(ngx_pool_t *pool, u_char *key, u_char *salt,
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28 u_char **encrypted);
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29
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30 #endif
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33 static u_char *ngx_crypt_to64(u_char *p, uint32_t v, size_t n);
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36 ngx_int_t
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37 ngx_crypt(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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38 {
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39 if (ngx_strncmp(salt, "$apr1$", sizeof("$apr1$") - 1) == 0) {
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40 return ngx_crypt_apr1(pool, key, salt, encrypted);
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41
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42 } else if (ngx_strncmp(salt, "{PLAIN}", sizeof("{PLAIN}") - 1) == 0) {
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43 return ngx_crypt_plain(pool, key, salt, encrypted);
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44
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45 #if (NGX_HAVE_SHA1)
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46 } else if (ngx_strncmp(salt, "{SSHA}", sizeof("{SSHA}") - 1) == 0) {
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47 return ngx_crypt_ssha(pool, key, salt, encrypted);
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48
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49 } else if (ngx_strncmp(salt, "{SHA}", sizeof("{SHA}") - 1) == 0) {
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50 return ngx_crypt_sha(pool, key, salt, encrypted);
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51 #endif
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52 }
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54 /* fallback to libc crypt() */
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56 return ngx_libc_crypt(pool, key, salt, encrypted);
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57 }
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60 static ngx_int_t
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61 ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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62 {
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63 ngx_int_t n;
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64 ngx_uint_t i;
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65 u_char *p, *last, final[16];
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66 size_t saltlen, keylen;
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67 ngx_md5_t md5, ctx1;
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68
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69 /* Apache's apr1 crypt is Paul-Henning Kamp's md5 crypt with $apr1$ magic */
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70
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71 keylen = ngx_strlen(key);
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72
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73 /* true salt: no magic, max 8 chars, stop at first $ */
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74
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75 salt += sizeof("$apr1$") - 1;
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76 last = salt + 8;
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77 for (p = salt; *p && *p != '$' && p < last; p++) { /* void */ }
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78 saltlen = p - salt;
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79
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80 /* hash key and salt */
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81
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82 ngx_md5_init(&md5);
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83 ngx_md5_update(&md5, key, keylen);
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84 ngx_md5_update(&md5, (u_char *) "$apr1$", sizeof("$apr1$") - 1);
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85 ngx_md5_update(&md5, salt, saltlen);
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86
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87 ngx_md5_init(&ctx1);
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88 ngx_md5_update(&ctx1, key, keylen);
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89 ngx_md5_update(&ctx1, salt, saltlen);
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90 ngx_md5_update(&ctx1, key, keylen);
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91 ngx_md5_final(final, &ctx1);
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92
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93 for (n = keylen; n > 0; n -= 16) {
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94 ngx_md5_update(&md5, final, n > 16 ? 16 : n);
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95 }
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96
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97 ngx_memzero(final, sizeof(final));
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98
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99 for (i = keylen; i; i >>= 1) {
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100 if (i & 1) {
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101 ngx_md5_update(&md5, final, 1);
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102
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103 } else {
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104 ngx_md5_update(&md5, key, 1);
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105 }
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106 }
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107
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108 ngx_md5_final(final, &md5);
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109
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110 for (i = 0; i < 1000; i++) {
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111 ngx_md5_init(&ctx1);
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112
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113 if (i & 1) {
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114 ngx_md5_update(&ctx1, key, keylen);
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115
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116 } else {
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117 ngx_md5_update(&ctx1, final, 16);
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118 }
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119
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120 if (i % 3) {
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121 ngx_md5_update(&ctx1, salt, saltlen);
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122 }
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123
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124 if (i % 7) {
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125 ngx_md5_update(&ctx1, key, keylen);
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126 }
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127
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128 if (i & 1) {
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129 ngx_md5_update(&ctx1, final, 16);
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130
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131 } else {
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132 ngx_md5_update(&ctx1, key, keylen);
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133 }
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134
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135 ngx_md5_final(final, &ctx1);
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136 }
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137
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138 /* output */
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139
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140 *encrypted = ngx_pnalloc(pool, sizeof("$apr1$") - 1 + saltlen + 16 + 1);
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141 if (*encrypted == NULL) {
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142 return NGX_ERROR;
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143 }
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144
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145 p = ngx_cpymem(*encrypted, "$apr1$", sizeof("$apr1$") - 1);
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146 p = ngx_copy(p, salt, saltlen);
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147 *p++ = '$';
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148
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149 p = ngx_crypt_to64(p, (final[ 0]<<16) | (final[ 6]<<8) | final[12], 4);
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150 p = ngx_crypt_to64(p, (final[ 1]<<16) | (final[ 7]<<8) | final[13], 4);
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151 p = ngx_crypt_to64(p, (final[ 2]<<16) | (final[ 8]<<8) | final[14], 4);
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152 p = ngx_crypt_to64(p, (final[ 3]<<16) | (final[ 9]<<8) | final[15], 4);
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153 p = ngx_crypt_to64(p, (final[ 4]<<16) | (final[10]<<8) | final[ 5], 4);
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154 p = ngx_crypt_to64(p, final[11], 2);
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155 *p = '\0';
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156
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157 return NGX_OK;
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158 }
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159
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160
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161 static u_char *
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162 ngx_crypt_to64(u_char *p, uint32_t v, size_t n)
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163 {
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164 static u_char itoa64[] =
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165 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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166
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167 while (n--) {
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168 *p++ = itoa64[v & 0x3f];
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169 v >>= 6;
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170 }
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171
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172 return p;
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173 }
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174
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175
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176 static ngx_int_t
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177 ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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178 {
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179 size_t len;
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180 u_char *p;
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181
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182 len = ngx_strlen(key);
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183
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184 *encrypted = ngx_pnalloc(pool, sizeof("{PLAIN}") - 1 + len + 1);
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185 if (*encrypted == NULL) {
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186 return NGX_ERROR;
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187 }
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188
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189 p = ngx_cpymem(*encrypted, "{PLAIN}", sizeof("{PLAIN}") - 1);
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190 ngx_memcpy(p, key, len + 1);
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191
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192 return NGX_OK;
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193 }
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194
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195
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196 #if (NGX_HAVE_SHA1)
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197
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198 static ngx_int_t
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199 ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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200 {
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201 size_t len;
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202 ngx_int_t rc;
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203 ngx_str_t encoded, decoded;
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204 ngx_sha1_t sha1;
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205
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206 /* "{SSHA}" base64(SHA1(key salt) salt) */
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207
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208 /* decode base64 salt to find out true salt */
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209
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210 encoded.data = salt + sizeof("{SSHA}") - 1;
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211 encoded.len = ngx_strlen(encoded.data);
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212
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213 len = ngx_max(ngx_base64_decoded_length(encoded.len), 20);
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214
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215 decoded.data = ngx_pnalloc(pool, len);
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216 if (decoded.data == NULL) {
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217 return NGX_ERROR;
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218 }
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219
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220 rc = ngx_decode_base64(&decoded, &encoded);
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221
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222 if (rc != NGX_OK || decoded.len < 20) {
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223 decoded.len = 20;
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224 }
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225
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226 /* update SHA1 from key and salt */
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227
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228 ngx_sha1_init(&sha1);
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229 ngx_sha1_update(&sha1, key, ngx_strlen(key));
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230 ngx_sha1_update(&sha1, decoded.data + 20, decoded.len - 20);
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231 ngx_sha1_final(decoded.data, &sha1);
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232
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233 /* encode it back to base64 */
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234
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235 len = sizeof("{SSHA}") - 1 + ngx_base64_encoded_length(decoded.len) + 1;
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236
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237 *encrypted = ngx_pnalloc(pool, len);
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238 if (*encrypted == NULL) {
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239 return NGX_ERROR;
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240 }
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241
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242 encoded.data = ngx_cpymem(*encrypted, "{SSHA}", sizeof("{SSHA}") - 1);
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243 ngx_encode_base64(&encoded, &decoded);
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244 encoded.data[encoded.len] = '\0';
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245
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246 return NGX_OK;
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247 }
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248
5034
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249
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250 static ngx_int_t
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251 ngx_crypt_sha(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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252 {
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253 size_t len;
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254 ngx_str_t encoded, decoded;
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255 ngx_sha1_t sha1;
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256 u_char digest[20];
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257
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258 /* "{SHA}" base64(SHA1(key)) */
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259
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260 decoded.len = sizeof(digest);
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261 decoded.data = digest;
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262
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263 ngx_sha1_init(&sha1);
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264 ngx_sha1_update(&sha1, key, ngx_strlen(key));
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265 ngx_sha1_final(digest, &sha1);
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266
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267 len = sizeof("{SHA}") - 1 + ngx_base64_encoded_length(decoded.len) + 1;
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268
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269 *encrypted = ngx_pnalloc(pool, len);
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270 if (*encrypted == NULL) {
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271 return NGX_ERROR;
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272 }
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273
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274 encoded.data = ngx_cpymem(*encrypted, "{SHA}", sizeof("{SHA}") - 1);
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275 ngx_encode_base64(&encoded, &decoded);
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276 encoded.data[encoded.len] = '\0';
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277
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278 return NGX_OK;
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279 }
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280
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281 #endif /* NGX_HAVE_SHA1 */
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282
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283 #endif /* NGX_CRYPT */