Mercurial > hg > nginx-quic
annotate src/core/ngx_crypt.c @ 4207:4fc91bae6f83
Better recheck of dead upstream servers.
Previously nginx used to mark backend again as live as soon as fail_timeout
passes (10s by default) since last failure. On the other hand, detecting
dead backend takes up to 60s (proxy_connect_timeout) in typical situation
"backend is down and doesn't respond to any packets". This resulted in
suboptimal behaviour in the above situation (up to 23% of requests were
directed to dead backend with default settings).
More detailed description of the problem may be found here (in Russian):
http://mailman.nginx.org/pipermail/nginx-ru/2011-August/042172.html
Fix is to only allow one request after fail_timeout passes, and
mark backend as "live" only if this request succeeds.
Note that with new code backend will not be marked "live" unless "check"
request is completed, and this may take a while in some specific workloads
(e.g. streaming). This is believed to be acceptable.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 12 Oct 2011 14:22:48 +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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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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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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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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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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48 /* fallback to libc crypt() */ |
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50 return ngx_libc_crypt(pool, key, salt, encrypted); |
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51 } |
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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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67 /* true salt: no magic, max 8 chars, stop at first $ */ |
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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 != '$' && p < last; p++) { /* void */ } |
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72 saltlen = p - salt; |
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73 |
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74 /* hash key and salt */ |
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76 ngx_md5_init(&md5); |
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77 ngx_md5_update(&md5, key, keylen); |
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78 ngx_md5_update(&md5, (u_char *) "$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 */ |