Mercurial > hg > nginx-quic
annotate src/core/ngx_crypt.c @ 4010:74a93d3fdd85
Fixing cpu hog with all upstream servers marked "down".
The following configuration causes nginx to hog cpu due to infinite loop
in ngx_http_upstream_get_peer():
upstream backend {
server 127.0.0.1:8080 down;
server 127.0.0.1:8080 down;
}
server {
...
location / {
proxy_pass http://backend;
}
}
Make sure we don't loop infinitely in ngx_http_upstream_get_peer() but stop
after resetting peer weights once.
Return 0 if we are stuck. This is guaranteed to work as peer 0 always exists,
and eventually ngx_http_upstream_get_round_robin_peer() will do the right
thing falling back to backup servers or returning NGX_BUSY.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Thu, 18 Aug 2011 16:52:38 +0000 |
parents | 105841a157b9 |
children | 4c36e15651f7 |
rev | line source |
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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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9 #include <ngx_md5.h> |
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10 #if (NGX_HAVE_SHA1) |
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11 #include <ngx_sha1.h> |
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12 #endif |
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13 |
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14 |
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15 #if (NGX_CRYPT) |
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17 static ngx_int_t ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt, |
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18 u_char **encrypted); |
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19 static ngx_int_t ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt, |
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20 u_char **encrypted); |
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21 |
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22 #if (NGX_HAVE_SHA1) |
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24 static ngx_int_t ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt, |
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25 u_char **encrypted); |
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27 #endif |
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28 |
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29 |
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30 static u_char *ngx_crypt_to64(u_char *p, uint32_t v, size_t n); |
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33 ngx_int_t |
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34 ngx_crypt(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted) |
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35 { |
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36 if (ngx_strncmp(salt, "$apr1$", sizeof("$apr1$") - 1) == 0) { |
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37 return ngx_crypt_apr1(pool, key, salt, encrypted); |
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38 |
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39 } else if (ngx_strncmp(salt, "{PLAIN}", sizeof("{PLAIN}") - 1) == 0) { |
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40 return ngx_crypt_plain(pool, key, salt, encrypted); |
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41 |
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42 #if (NGX_HAVE_SHA1) |
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43 } else if (ngx_strncmp(salt, "{SSHA}", sizeof("{SSHA}") - 1) == 0) { |
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44 return ngx_crypt_ssha(pool, key, salt, encrypted); |
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45 #endif |
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46 } |
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47 |
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48 /* fallback to libc crypt() */ |
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49 |
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50 return ngx_libc_crypt(pool, key, salt, encrypted); |
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51 } |
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52 |
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53 |
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54 static ngx_int_t |
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55 ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted) |
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56 { |
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57 ngx_int_t n; |
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58 ngx_uint_t i; |
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59 u_char *p, *last, final[16]; |
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60 size_t saltlen, keylen; |
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61 ngx_md5_t md5, ctx1; |
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62 |
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63 /* Apache's apr1 crypt is Paul-Henning Kamp's md5 crypt with $apr1$ magic */ |
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64 |
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65 keylen = ngx_strlen(key); |
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66 |
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67 /* true salt: no magic, max 8 chars, stop at first $ */ |
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68 |
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69 salt += sizeof("$apr1$") - 1; |
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70 last = salt + 8; |
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71 for (p = salt; *p && *p != '$' && p < last; p++) { /* void */ } |
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72 saltlen = p - salt; |
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73 |
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74 /* hash key and salt */ |
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75 |
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76 ngx_md5_init(&md5); |
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77 ngx_md5_update(&md5, key, keylen); |
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78 ngx_md5_update(&md5, (u_char *) "$apr1$", sizeof("$apr1$") - 1); |
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79 ngx_md5_update(&md5, salt, saltlen); |
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81 ngx_md5_init(&ctx1); |
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82 ngx_md5_update(&ctx1, key, keylen); |
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83 ngx_md5_update(&ctx1, salt, saltlen); |
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84 ngx_md5_update(&ctx1, key, keylen); |
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85 ngx_md5_final(final, &ctx1); |
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86 |
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87 for (n = keylen; n > 0; n -= 16) { |
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88 ngx_md5_update(&md5, final, n > 16 ? 16 : n); |
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89 } |
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90 |
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91 ngx_memzero(final, sizeof(final)); |
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92 |
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93 for (i = keylen; i; i >>= 1) { |
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94 if (i & 1) { |
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95 ngx_md5_update(&md5, final, 1); |
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96 |
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97 } else { |
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98 ngx_md5_update(&md5, key, 1); |
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99 } |
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100 } |
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101 |
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102 ngx_md5_final(final, &md5); |
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103 |
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104 for (i = 0; i < 1000; i++) { |
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105 ngx_md5_init(&ctx1); |
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106 |
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107 if (i & 1) { |
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108 ngx_md5_update(&ctx1, key, keylen); |
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109 |
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110 } else { |
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111 ngx_md5_update(&ctx1, final, 16); |
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112 } |
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113 |
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114 if (i % 3) { |
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115 ngx_md5_update(&ctx1, salt, saltlen); |
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116 } |
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117 |
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118 if (i % 7) { |
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119 ngx_md5_update(&ctx1, key, keylen); |
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120 } |
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121 |
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122 if (i & 1) { |
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123 ngx_md5_update(&ctx1, final, 16); |
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124 |
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125 } else { |
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126 ngx_md5_update(&ctx1, key, keylen); |
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127 } |
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128 |
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129 ngx_md5_final(final, &ctx1); |
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130 } |
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131 |
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132 /* output */ |
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133 |
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134 *encrypted = ngx_pnalloc(pool, sizeof("$apr1$") - 1 + saltlen + 16 + 1); |
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135 if (*encrypted == NULL) { |
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136 return NGX_ERROR; |
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137 } |
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138 |
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139 p = ngx_cpymem(*encrypted, "$apr1$", sizeof("$apr1$") - 1); |
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140 p = ngx_copy(p, salt, saltlen); |
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141 *p++ = '$'; |
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142 |
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143 p = ngx_crypt_to64(p, (final[ 0]<<16) | (final[ 6]<<8) | final[12], 4); |
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144 p = ngx_crypt_to64(p, (final[ 1]<<16) | (final[ 7]<<8) | final[13], 4); |
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145 p = ngx_crypt_to64(p, (final[ 2]<<16) | (final[ 8]<<8) | final[14], 4); |
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146 p = ngx_crypt_to64(p, (final[ 3]<<16) | (final[ 9]<<8) | final[15], 4); |
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147 p = ngx_crypt_to64(p, (final[ 4]<<16) | (final[10]<<8) | final[ 5], 4); |
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148 p = ngx_crypt_to64(p, final[11], 2); |
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149 *p = '\0'; |
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150 |
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151 return NGX_OK; |
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152 } |
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153 |
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154 |
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155 static u_char * |
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156 ngx_crypt_to64(u_char *p, uint32_t v, size_t n) |
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157 { |
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158 static u_char itoa64[] = |
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159 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; |
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160 |
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161 while (n--) { |
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162 *p++ = itoa64[v & 0x3f]; |
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163 v >>= 6; |
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164 } |
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165 |
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166 return p; |
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167 } |
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168 |
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169 |
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170 static ngx_int_t |
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171 ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted) |
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172 { |
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173 size_t len; |
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174 u_char *p; |
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175 |
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176 len = ngx_strlen(key); |
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177 |
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178 *encrypted = ngx_pnalloc(pool, sizeof("{PLAIN}") - 1 + len + 1); |
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179 if (*encrypted == NULL) { |
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180 return NGX_ERROR; |
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181 } |
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182 |
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183 p = ngx_cpymem(*encrypted, "{PLAIN}", sizeof("{PLAIN}") - 1); |
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184 ngx_memcpy(p, key, len + 1); |
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185 |
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186 return NGX_OK; |
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187 } |
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188 |
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189 |
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190 #if (NGX_HAVE_SHA1) |
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191 |
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192 static ngx_int_t |
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193 ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted) |
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194 { |
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195 size_t len; |
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196 ngx_str_t encoded, decoded; |
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197 ngx_sha1_t sha1; |
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198 |
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199 /* "{SSHA}" base64(SHA1(key salt) salt) */ |
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200 |
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201 /* decode base64 salt to find out true salt */ |
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202 |
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203 encoded.data = salt + sizeof("{SSHA}") - 1; |
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204 encoded.len = ngx_strlen(encoded.data); |
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205 |
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206 decoded.data = ngx_pnalloc(pool, ngx_base64_decoded_length(encoded.len)); |
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207 if (decoded.data == NULL) { |
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208 return NGX_ERROR; |
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209 } |
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210 |
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211 ngx_decode_base64(&decoded, &encoded); |
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212 |
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213 /* update SHA1 from key and salt */ |
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214 |
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215 ngx_sha1_init(&sha1); |
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216 ngx_sha1_update(&sha1, key, ngx_strlen(key)); |
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217 ngx_sha1_update(&sha1, decoded.data + 20, decoded.len - 20); |
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218 ngx_sha1_final(decoded.data, &sha1); |
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219 |
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220 /* encode it back to base64 */ |
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221 |
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222 len = sizeof("{SSHA}") - 1 + ngx_base64_encoded_length(decoded.len) + 1; |
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223 |
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224 *encrypted = ngx_pnalloc(pool, len); |
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225 if (*encrypted == NULL) { |
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226 return NGX_ERROR; |
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227 } |
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228 |
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229 encoded.data = ngx_cpymem(*encrypted, "{SSHA}", sizeof("{SSHA}") - 1); |
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230 ngx_encode_base64(&encoded, &decoded); |
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231 encoded.data[encoded.len] = '\0'; |
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232 |
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233 return NGX_OK; |
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234 } |
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235 |
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236 #endif /* NGX_HAVE_SHA1 */ |
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237 |
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238 #endif /* NGX_CRYPT */ |