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626
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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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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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682
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9 #include <ngx_crypt.h>
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626
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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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14
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15
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628
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16 #if (NGX_CRYPT)
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17
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626
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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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22
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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
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28 #endif
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29
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30
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31 static u_char *ngx_crypt_to64(u_char *p, uint32_t v, size_t n);
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32
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33
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34 ngx_int_t
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35 ngx_crypt(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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36 {
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37 if (ngx_strncmp(salt, "$apr1$", sizeof("$apr1$") - 1) == 0) {
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38 return ngx_crypt_apr1(pool, key, salt, encrypted);
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39
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40 } else if (ngx_strncmp(salt, "{PLAIN}", sizeof("{PLAIN}") - 1) == 0) {
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41 return ngx_crypt_plain(pool, key, salt, encrypted);
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42
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43 #if (NGX_HAVE_SHA1)
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44 } else if (ngx_strncmp(salt, "{SSHA}", sizeof("{SSHA}") - 1) == 0) {
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45 return ngx_crypt_ssha(pool, key, salt, encrypted);
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46 #endif
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47 }
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48
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49 /* fallback to libc crypt() */
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50
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51 return ngx_libc_crypt(pool, key, salt, encrypted);
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52 }
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53
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54
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55 static ngx_int_t
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56 ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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57 {
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58 ngx_int_t n;
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59 ngx_uint_t i;
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60 u_char *p, *last, final[16];
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61 size_t saltlen, keylen;
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62 ngx_md5_t md5, ctx1;
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63
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64 /* Apache's apr1 crypt is Paul-Henning Kamp's md5 crypt with $apr1$ magic */
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65
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66 keylen = ngx_strlen(key);
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67
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68 /* true salt: no magic, max 8 chars, stop at first $ */
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69
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70 salt += sizeof("$apr1$") - 1;
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71 last = salt + 8;
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72 for (p = salt; *p && *p != '$' && p < last; p++) { /* void */ }
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73 saltlen = p - salt;
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74
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75 /* hash key and salt */
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76
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77 ngx_md5_init(&md5);
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78 ngx_md5_update(&md5, key, keylen);
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628
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79 ngx_md5_update(&md5, (u_char *) "$apr1$", sizeof("$apr1$") - 1);
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626
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80 ngx_md5_update(&md5, salt, saltlen);
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81
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82 ngx_md5_init(&ctx1);
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83 ngx_md5_update(&ctx1, key, keylen);
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84 ngx_md5_update(&ctx1, salt, saltlen);
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85 ngx_md5_update(&ctx1, key, keylen);
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86 ngx_md5_final(final, &ctx1);
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87
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88 for (n = keylen; n > 0; n -= 16) {
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89 ngx_md5_update(&md5, final, n > 16 ? 16 : n);
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90 }
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91
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92 ngx_memzero(final, sizeof(final));
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93
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94 for (i = keylen; i; i >>= 1) {
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95 if (i & 1) {
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96 ngx_md5_update(&md5, final, 1);
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97
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98 } else {
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99 ngx_md5_update(&md5, key, 1);
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100 }
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101 }
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102
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103 ngx_md5_final(final, &md5);
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104
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105 for (i = 0; i < 1000; i++) {
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106 ngx_md5_init(&ctx1);
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107
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108 if (i & 1) {
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109 ngx_md5_update(&ctx1, key, keylen);
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110
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111 } else {
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112 ngx_md5_update(&ctx1, final, 16);
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113 }
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114
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115 if (i % 3) {
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116 ngx_md5_update(&ctx1, salt, saltlen);
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117 }
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118
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119 if (i % 7) {
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120 ngx_md5_update(&ctx1, key, keylen);
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121 }
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122
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123 if (i & 1) {
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124 ngx_md5_update(&ctx1, final, 16);
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125
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126 } else {
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127 ngx_md5_update(&ctx1, key, keylen);
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128 }
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129
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130 ngx_md5_final(final, &ctx1);
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131 }
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132
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133 /* output */
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134
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135 *encrypted = ngx_pnalloc(pool, sizeof("$apr1$") - 1 + saltlen + 16 + 1);
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136 if (*encrypted == NULL) {
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137 return NGX_ERROR;
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138 }
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139
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140 p = ngx_cpymem(*encrypted, "$apr1$", sizeof("$apr1$") - 1);
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141 p = ngx_copy(p, salt, saltlen);
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142 *p++ = '$';
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143
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144 p = ngx_crypt_to64(p, (final[ 0]<<16) | (final[ 6]<<8) | final[12], 4);
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145 p = ngx_crypt_to64(p, (final[ 1]<<16) | (final[ 7]<<8) | final[13], 4);
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146 p = ngx_crypt_to64(p, (final[ 2]<<16) | (final[ 8]<<8) | final[14], 4);
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147 p = ngx_crypt_to64(p, (final[ 3]<<16) | (final[ 9]<<8) | final[15], 4);
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148 p = ngx_crypt_to64(p, (final[ 4]<<16) | (final[10]<<8) | final[ 5], 4);
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149 p = ngx_crypt_to64(p, final[11], 2);
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150 *p = '\0';
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151
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152 return NGX_OK;
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153 }
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154
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155
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156 static u_char *
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157 ngx_crypt_to64(u_char *p, uint32_t v, size_t n)
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158 {
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159 static u_char itoa64[] =
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160 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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161
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162 while (n--) {
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163 *p++ = itoa64[v & 0x3f];
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164 v >>= 6;
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165 }
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166
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167 return p;
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168 }
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169
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170
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171 static ngx_int_t
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172 ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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173 {
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174 size_t len;
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175 u_char *p;
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176
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177 len = ngx_strlen(key);
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178
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179 *encrypted = ngx_pnalloc(pool, sizeof("{PLAIN}") - 1 + len + 1);
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180 if (*encrypted == NULL) {
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181 return NGX_ERROR;
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182 }
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183
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184 p = ngx_cpymem(*encrypted, "{PLAIN}", sizeof("{PLAIN}") - 1);
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185 ngx_memcpy(p, key, len + 1);
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186
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187 return NGX_OK;
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188 }
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189
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190
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191 #if (NGX_HAVE_SHA1)
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192
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193 static ngx_int_t
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194 ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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195 {
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196 size_t len;
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197 ngx_int_t rc;
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198 ngx_str_t encoded, decoded;
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199 ngx_sha1_t sha1;
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200
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201 /* "{SSHA}" base64(SHA1(key salt) salt) */
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202
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203 /* decode base64 salt to find out true salt */
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204
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205 encoded.data = salt + sizeof("{SSHA}") - 1;
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206 encoded.len = ngx_strlen(encoded.data);
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207
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208 len = ngx_max(ngx_base64_decoded_length(encoded.len), 20);
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209
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210 decoded.data = ngx_pnalloc(pool, len);
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211 if (decoded.data == NULL) {
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212 return NGX_ERROR;
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213 }
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214
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215 rc = ngx_decode_base64(&decoded, &encoded);
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216
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217 if (rc != NGX_OK || decoded.len < 20) {
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218 decoded.len = 20;
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219 }
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626
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220
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221 /* update SHA1 from key and salt */
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222
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223 ngx_sha1_init(&sha1);
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224 ngx_sha1_update(&sha1, key, ngx_strlen(key));
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225 ngx_sha1_update(&sha1, decoded.data + 20, decoded.len - 20);
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226 ngx_sha1_final(decoded.data, &sha1);
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227
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228 /* encode it back to base64 */
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229
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230 len = sizeof("{SSHA}") - 1 + ngx_base64_encoded_length(decoded.len) + 1;
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231
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232 *encrypted = ngx_pnalloc(pool, len);
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233 if (*encrypted == NULL) {
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234 return NGX_ERROR;
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235 }
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236
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237 encoded.data = ngx_cpymem(*encrypted, "{SSHA}", sizeof("{SSHA}") - 1);
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238 ngx_encode_base64(&encoded, &decoded);
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239 encoded.data[encoded.len] = '\0';
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240
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241 return NGX_OK;
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242 }
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243
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244 #endif /* NGX_HAVE_SHA1 */
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628
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245
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246 #endif /* NGX_CRYPT */
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