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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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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_http.h>
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10
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11
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12 #define NGX_HTTP_AUTH_BUF_SIZE 2048
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13
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14
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15 typedef struct {
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16 ngx_str_t passwd;
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17 } ngx_http_auth_basic_ctx_t;
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18
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19
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20 typedef struct {
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21 ngx_str_t realm;
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22 ngx_str_t user_file;
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23 } ngx_http_auth_basic_loc_conf_t;
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24
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25
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26 static ngx_int_t ngx_http_auth_basic_handler(ngx_http_request_t *r);
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27 static ngx_int_t ngx_http_auth_basic_crypt_handler(ngx_http_request_t *r,
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28 ngx_http_auth_basic_ctx_t *ctx, ngx_str_t *passwd, ngx_str_t *realm);
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29 static ngx_int_t ngx_http_auth_basic_set_realm(ngx_http_request_t *r,
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30 ngx_str_t *realm);
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31 static void ngx_http_auth_basic_close(ngx_file_t *file);
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32 static void *ngx_http_auth_basic_create_loc_conf(ngx_conf_t *cf);
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33 static char *ngx_http_auth_basic_merge_loc_conf(ngx_conf_t *cf,
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34 void *parent, void *child);
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35 static ngx_int_t ngx_http_auth_basic_init(ngx_cycle_t *cycle);
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36 static char *ngx_http_auth_basic(ngx_conf_t *cf, void *post, void *data);
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37
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38
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39 static ngx_conf_post_handler_pt ngx_http_auth_basic_p = ngx_http_auth_basic;
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40
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41 static ngx_command_t ngx_http_auth_basic_commands[] = {
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42
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43 { ngx_string("auth_basic"),
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44 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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45 ngx_conf_set_str_slot,
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46 NGX_HTTP_LOC_CONF_OFFSET,
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47 offsetof(ngx_http_auth_basic_loc_conf_t, realm),
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48 &ngx_http_auth_basic_p },
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49
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50 { ngx_string("auth_basic_user_file"),
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51 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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52 ngx_conf_set_str_slot,
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53 NGX_HTTP_LOC_CONF_OFFSET,
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54 offsetof(ngx_http_auth_basic_loc_conf_t, user_file),
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55 NULL },
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56
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57 ngx_null_command
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58 };
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59
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60
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61
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62 ngx_http_module_t ngx_http_auth_basic_module_ctx = {
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63 NULL, /* preconfiguration */
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64 NULL, /* postconfiguration */
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65
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66 NULL, /* create main configuration */
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67 NULL, /* init main configuration */
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68
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69 NULL, /* create server configuration */
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70 NULL, /* merge server configuration */
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71
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72 ngx_http_auth_basic_create_loc_conf, /* create location configuration */
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73 ngx_http_auth_basic_merge_loc_conf /* merge location configuration */
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74 };
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75
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76
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77 ngx_module_t ngx_http_auth_basic_module = {
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509
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78 NGX_MODULE_V1,
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79 &ngx_http_auth_basic_module_ctx, /* module context */
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80 ngx_http_auth_basic_commands, /* module directives */
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81 NGX_HTTP_MODULE, /* module type */
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541
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82 NULL, /* init master */
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83 ngx_http_auth_basic_init, /* init module */
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541
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84 NULL, /* init process */
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85 NULL, /* init thread */
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86 NULL, /* exit thread */
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87 NULL, /* exit process */
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88 NULL, /* exit master */
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89 NGX_MODULE_V1_PADDING
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90 };
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91
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92
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93 static ngx_int_t
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94 ngx_http_auth_basic_handler(ngx_http_request_t *r)
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95 {
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96 off_t offset;
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97 ssize_t n;
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98 ngx_fd_t fd;
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99 ngx_int_t rc;
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100 ngx_str_t pwd;
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101 ngx_uint_t i, login, left, passwd;
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102 ngx_file_t file;
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103 ngx_http_auth_basic_ctx_t *ctx;
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104 ngx_http_auth_basic_loc_conf_t *alcf;
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105 u_char buf[NGX_HTTP_AUTH_BUF_SIZE];
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106 enum {
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107 sw_login,
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108 sw_passwd,
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109 sw_skip
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110 } state;
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111
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112 alcf = ngx_http_get_module_loc_conf(r, ngx_http_auth_basic_module);
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113
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114 if (alcf->realm.len == 0 || alcf->user_file.len == 0) {
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115 return NGX_OK;
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116 }
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117
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118 ctx = ngx_http_get_module_ctx(r, ngx_http_auth_basic_module);
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119
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120 if (ctx) {
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121 return ngx_http_auth_basic_crypt_handler(r, ctx, &ctx->passwd,
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122 &alcf->realm);
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123 }
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124
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125 rc = ngx_http_auth_basic_user(r);
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126
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539
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127 if (rc == NGX_DECLINED) {
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128 return ngx_http_auth_basic_set_realm(r, &alcf->realm);
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129 }
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130
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131 if (rc == NGX_ERROR) {
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132 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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133 }
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134
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135 fd = ngx_open_file(alcf->user_file.data, NGX_FILE_RDONLY, NGX_FILE_OPEN);
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136
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137 if (fd == NGX_INVALID_FILE) {
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138 ngx_log_error(NGX_LOG_ERR, r->connection->log, ngx_errno,
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139 ngx_open_file_n " \"%s\" failed", alcf->user_file.data);
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140 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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141 }
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142
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143 ngx_memzero(&file, sizeof(ngx_file_t));
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144
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145 file.fd = fd;
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146 file.name = alcf->user_file;
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147 file.log = r->connection->log;
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148
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149 state = sw_login;
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150 passwd = 0;
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151 login = 0;
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152 left = 0;
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153 offset = 0;
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154
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155 for ( ;; ) {
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156 n = ngx_read_file(&file, buf + left, NGX_HTTP_AUTH_BUF_SIZE - left,
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157 offset);
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158
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159 if (n == NGX_ERROR) {
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160 ngx_http_auth_basic_close(&file);
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161 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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162 }
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163
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164 if (n == 0) {
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165 break;
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166 }
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167
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168 for (i = left; i < left + n; i++) {
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169 switch (state) {
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170
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171 case sw_login:
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172 if (login == 0 && buf[i] == '#') {
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173 state = sw_skip;
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174 break;
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175 }
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176
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177 if (buf[i] != r->headers_in.user.data[login]) {
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178 state = sw_skip;
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179 break;
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180 }
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181
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182 if (login == r->headers_in.user.len) {
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183 state = sw_passwd;
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184 passwd = i + 1;
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185 }
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186
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187 login++;
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188
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189 break;
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190
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191 case sw_passwd:
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192 if (buf[i] == LF || buf[i] == CR || buf[i] == ':') {
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193 buf[i] = '\0';
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194
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195 ngx_http_auth_basic_close(&file);
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196
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197 pwd.len = i - passwd;
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198 pwd.data = &buf[passwd];
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199
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200 return ngx_http_auth_basic_crypt_handler(r, NULL, &pwd,
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201 &alcf->realm);
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202 }
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203
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204 break;
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205
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206 case sw_skip:
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207 if (buf[i] == LF) {
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208 state = sw_login;
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209 login = 0;
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210 }
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211
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212 break;
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213 }
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214 }
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215
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216 if (state == sw_passwd) {
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217 left = left + n - passwd;
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218 ngx_memcpy(buf, &buf[passwd], left);
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219 passwd = 0;
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220
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221 } else {
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222 left = 0;
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223 }
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224
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225 offset += n;
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226 }
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227
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228 ngx_http_auth_basic_close(&file);
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229
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230 return ngx_http_auth_basic_set_realm(r, &alcf->realm);
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231 }
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232
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233
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234 static ngx_int_t
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235 ngx_http_auth_basic_crypt_handler(ngx_http_request_t *r,
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236 ngx_http_auth_basic_ctx_t *ctx, ngx_str_t *passwd, ngx_str_t *realm)
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237 {
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238 ngx_int_t rc;
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239 u_char *encrypted;
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240
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241 rc = ngx_crypt(r->pool, r->headers_in.passwd.data, passwd->data,
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242 &encrypted);
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243
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244 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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245 "rc: %d user: \"%V\" salt: \"%s\"",
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246 rc, &r->headers_in.user, passwd->data);
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247
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248 if (rc == NGX_OK) {
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249 if (ngx_strcmp(encrypted, passwd->data) == 0) {
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250 return NGX_OK;
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251 }
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252
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253 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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254 "encrypted: \"%s\"", encrypted);
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255
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256 return ngx_http_auth_basic_set_realm(r, realm);
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257 }
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258
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259 if (rc == NGX_ERROR) {
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260 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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261 }
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262
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263 /* rc == NGX_AGAIN */
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264
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265 if (ctx == NULL) {
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266 ctx = ngx_palloc(r->pool, sizeof(ngx_http_auth_basic_ctx_t));
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267 if (ctx == NULL) {
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268 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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269 }
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270
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271 ngx_http_set_ctx(r, ctx, ngx_http_auth_basic_module);
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272
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273 ctx->passwd.len = passwd->len;
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274 passwd->len++;
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275
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276 ctx->passwd.data = ngx_pstrdup(r->pool, passwd);
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277 if (ctx->passwd.data == NULL) {
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278 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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279 }
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280
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281 }
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282
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283 /* TODO: add mutex event */
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284
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285 return rc;
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286 }
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287
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288
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289 static ngx_int_t
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290 ngx_http_auth_basic_set_realm(ngx_http_request_t *r, ngx_str_t *realm)
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291 {
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292 r->headers_out.www_authenticate = ngx_list_push(&r->headers_out.headers);
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293 if (r->headers_out.www_authenticate == NULL) {
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294 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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295 }
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296
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297 r->headers_out.www_authenticate->hash = 1;
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298 r->headers_out.www_authenticate->key.len = sizeof("WWW-Authenticate") - 1;
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299 r->headers_out.www_authenticate->key.data = (u_char *) "WWW-Authenticate";
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300 r->headers_out.www_authenticate->value = *realm;
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301
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302 return NGX_HTTP_UNAUTHORIZED;
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303 }
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304
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305 static void
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306 ngx_http_auth_basic_close(ngx_file_t *file)
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307 {
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308 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
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309 ngx_log_error(NGX_LOG_ALERT, file->log, ngx_errno,
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310 ngx_close_file_n " \"%s\" failed", file->name.data);
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311 }
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312 }
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313
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314
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315 static void *
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316 ngx_http_auth_basic_create_loc_conf(ngx_conf_t *cf)
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317 {
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318 ngx_http_auth_basic_loc_conf_t *conf;
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319
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320 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_auth_basic_loc_conf_t));
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321 if (conf == NULL) {
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322 return NGX_CONF_ERROR;
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323 }
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324
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325 return conf;
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326 }
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327
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328
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329 static char *
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330 ngx_http_auth_basic_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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331 {
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332 ngx_http_auth_basic_loc_conf_t *prev = parent;
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333 ngx_http_auth_basic_loc_conf_t *conf = child;
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334
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335 size_t len;
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336 u_char *realm, *p;
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337
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338 if (conf->realm.data) {
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339 if (conf->realm.len) {
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340 len = sizeof("Basic realm=\"") - 1 + conf->realm.len + 1;
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341
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342 realm = ngx_palloc(cf->pool, len);
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343 if (realm == NULL) {
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344 return NGX_CONF_ERROR;
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345 }
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346
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347 p = ngx_cpymem(realm, "Basic realm=\"",
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348 sizeof("Basic realm=\"") - 1);
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349 p = ngx_cpymem(p, conf->realm.data, conf->realm.len);
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350 *p = '"';
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351
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352 conf->realm.len = len;
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353 conf->realm.data = realm;
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354 }
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355
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356 } else {
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357 conf->realm = prev->realm;
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358 }
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359
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360
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361 if (conf->user_file.data) {
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362 if (ngx_conf_full_name(cf->cycle, &conf->user_file) != NGX_OK) {
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363 return NGX_CONF_ERROR;
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364 }
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365
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366 } else {
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367 conf->user_file = prev->user_file;
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368 }
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369
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370 return NGX_CONF_OK;
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371 }
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372
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373
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374 static ngx_int_t
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375 ngx_http_auth_basic_init(ngx_cycle_t *cycle)
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376 {
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377 ngx_http_handler_pt *h;
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378 ngx_http_core_main_conf_t *cmcf;
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379
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380 cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
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381
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382 h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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383 if (h == NULL) {
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384 return NGX_ERROR;
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385 }
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386
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387 *h = ngx_http_auth_basic_handler;
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388
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389 return NGX_OK;
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390 }
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391
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392
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393 static char *
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394 ngx_http_auth_basic(ngx_conf_t *cf, void *post, void *data)
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395 {
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396 ngx_str_t *realm = data;
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397
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398 if (ngx_strcmp(realm->data, "off") == 0) {
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399 realm->len = 0;
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400 realm->data = (u_char *) "";
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401 }
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402
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403 return NGX_CONF_OK;
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404 }
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