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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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82 ngx_http_auth_basic_init, /* init module */
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83 NULL /* init process */
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84 };
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85
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86
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87 static ngx_int_t
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88 ngx_http_auth_basic_handler(ngx_http_request_t *r)
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89 {
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90 off_t offset;
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91 ssize_t n;
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92 ngx_fd_t fd;
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539
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93 ngx_int_t rc;
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94 ngx_str_t pwd;
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95 ngx_uint_t i, login, left, passwd;
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503
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96 ngx_file_t file;
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97 ngx_http_auth_basic_ctx_t *ctx;
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98 ngx_http_auth_basic_loc_conf_t *alcf;
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99 u_char buf[NGX_HTTP_AUTH_BUF_SIZE];
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100 enum {
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101 sw_login,
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102 sw_passwd,
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103 sw_skip
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104 } state;
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105
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106 alcf = ngx_http_get_module_loc_conf(r, ngx_http_auth_basic_module);
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107
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108 if (alcf->realm.len == 0 || alcf->user_file.len == 0) {
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109 return NGX_OK;
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110 }
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111
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112 ctx = ngx_http_get_module_ctx(r, ngx_http_auth_basic_module);
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113
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114 if (ctx) {
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115 return ngx_http_auth_basic_crypt_handler(r, ctx, &ctx->passwd,
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116 &alcf->realm);
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117 }
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118
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539
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119 rc = ngx_http_auth_basic_user(r);
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120
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539
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121 if (rc == NGX_DECLINED) {
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122 return ngx_http_auth_basic_set_realm(r, &alcf->realm);
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123 }
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124
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539
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125 if (rc == NGX_ERROR) {
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126 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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127 }
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128
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129 fd = ngx_open_file(alcf->user_file.data, NGX_FILE_RDONLY, NGX_FILE_OPEN);
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130
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131 if (fd == NGX_INVALID_FILE) {
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132 ngx_log_error(NGX_LOG_ERR, r->connection->log, ngx_errno,
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133 ngx_open_file_n " \"%s\" failed", alcf->user_file.data);
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134 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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135 }
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136
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137 ngx_memzero(&file, sizeof(ngx_file_t));
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138
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139 file.fd = fd;
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140 file.name = alcf->user_file;
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141 file.log = r->connection->log;
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142
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143 state = sw_login;
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144 passwd = 0;
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145 login = 0;
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146 left = 0;
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147 offset = 0;
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148
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149 for ( ;; ) {
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150 n = ngx_read_file(&file, buf + left, NGX_HTTP_AUTH_BUF_SIZE - left,
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151 offset);
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152
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153 if (n == NGX_ERROR) {
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154 ngx_http_auth_basic_close(&file);
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155 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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156 }
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157
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158 if (n == 0) {
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159 break;
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160 }
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161
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162 for (i = left; i < left + n; i++) {
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163 switch (state) {
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164
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165 case sw_login:
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166 if (login == 0 && buf[i] == '#') {
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167 state = sw_skip;
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168 break;
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169 }
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170
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171 if (buf[i] != r->headers_in.user.data[login]) {
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172 state = sw_skip;
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173 break;
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174 }
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175
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539
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176 if (login == r->headers_in.user.len) {
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177 state = sw_passwd;
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178 passwd = i + 1;
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179 }
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180
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181 login++;
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182
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183 break;
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184
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185 case sw_passwd:
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186 if (buf[i] == LF || buf[i] == CR || buf[i] == ':') {
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187 buf[i] = '\0';
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188
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189 ngx_http_auth_basic_close(&file);
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190
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191 pwd.len = i - passwd;
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192 pwd.data = &buf[passwd];
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193
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194 return ngx_http_auth_basic_crypt_handler(r, NULL, &pwd,
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195 &alcf->realm);
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196 }
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197
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198 break;
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199
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200 case sw_skip:
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201 if (buf[i] == LF) {
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202 state = sw_login;
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203 login = 0;
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204 }
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205
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206 break;
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207 }
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208 }
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209
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210 if (state == sw_passwd) {
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211 left = left + n - passwd;
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212 ngx_memcpy(buf, &buf[passwd], left);
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213 passwd = 0;
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214
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215 } else {
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216 left = 0;
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217 }
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218
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219 offset += n;
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220 }
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221
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222 ngx_http_auth_basic_close(&file);
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223
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224 return ngx_http_auth_basic_set_realm(r, &alcf->realm);
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225 }
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226
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227
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228 static ngx_int_t
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229 ngx_http_auth_basic_crypt_handler(ngx_http_request_t *r,
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230 ngx_http_auth_basic_ctx_t *ctx, ngx_str_t *passwd, ngx_str_t *realm)
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231 {
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232 ngx_int_t rc;
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233 u_char *encrypted;
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234
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235 rc = ngx_crypt(r->pool, r->headers_in.passwd.data, passwd->data,
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236 &encrypted);
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237
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238 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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239 "rc: %d user: \"%V\" salt: \"%s\"",
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240 rc, &r->headers_in.user, passwd->data);
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241
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242 if (rc == NGX_OK) {
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243 if (ngx_strcmp(encrypted, passwd->data) == 0) {
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244 return NGX_OK;
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245 }
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246
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247 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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248 "encrypted: \"%s\"", encrypted);
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249
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250 return ngx_http_auth_basic_set_realm(r, realm);
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251 }
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252
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253 if (rc == NGX_ERROR) {
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254 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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255 }
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256
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257 /* rc == NGX_AGAIN */
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258
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259 if (ctx == NULL) {
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260 ctx = ngx_palloc(r->pool, sizeof(ngx_http_auth_basic_ctx_t));
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261 if (ctx == NULL) {
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262 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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263 }
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264
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265 ngx_http_set_ctx(r, ctx, ngx_http_auth_basic_module);
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266
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267 ctx->passwd.len = passwd->len;
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268 passwd->len++;
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269
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270 ctx->passwd.data = ngx_pstrdup(r->pool, passwd);
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271 if (ctx->passwd.data == NULL) {
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272 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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273 }
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274
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275 }
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276
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277 /* TODO: add mutex event */
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278
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279 return rc;
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280 }
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281
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282
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283 static ngx_int_t
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284 ngx_http_auth_basic_set_realm(ngx_http_request_t *r, ngx_str_t *realm)
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285 {
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286 r->headers_out.www_authenticate = ngx_list_push(&r->headers_out.headers);
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287 if (r->headers_out.www_authenticate == NULL) {
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288 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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289 }
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290
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291 r->headers_out.www_authenticate->hash = 1;
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292 r->headers_out.www_authenticate->key.len = sizeof("WWW-Authenticate") - 1;
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293 r->headers_out.www_authenticate->key.data = (u_char *) "WWW-Authenticate";
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294 r->headers_out.www_authenticate->value = *realm;
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295
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296 return NGX_HTTP_UNAUTHORIZED;
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297 }
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298
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299 static void
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300 ngx_http_auth_basic_close(ngx_file_t *file)
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301 {
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302 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
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303 ngx_log_error(NGX_LOG_ALERT, file->log, ngx_errno,
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304 ngx_close_file_n " \"%s\" failed", file->name.data);
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305 }
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306 }
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307
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308
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309 static void *
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310 ngx_http_auth_basic_create_loc_conf(ngx_conf_t *cf)
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311 {
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312 ngx_http_auth_basic_loc_conf_t *conf;
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313
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314 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_auth_basic_loc_conf_t));
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315 if (conf == NULL) {
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316 return NGX_CONF_ERROR;
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317 }
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318
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319 return conf;
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320 }
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321
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322
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323 static char *
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324 ngx_http_auth_basic_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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325 {
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326 ngx_http_auth_basic_loc_conf_t *prev = parent;
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327 ngx_http_auth_basic_loc_conf_t *conf = child;
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328
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329 size_t len;
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330 u_char *realm, *p;
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331
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332 if (conf->realm.data) {
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333 if (conf->realm.len) {
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334 len = sizeof("Basic realm=\"") - 1 + conf->realm.len + 1;
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335
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336 realm = ngx_palloc(cf->pool, len);
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337 if (realm == NULL) {
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338 return NGX_CONF_ERROR;
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339 }
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340
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341 p = ngx_cpymem(realm, "Basic realm=\"",
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342 sizeof("Basic realm=\"") - 1);
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343 p = ngx_cpymem(p, conf->realm.data, conf->realm.len);
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344 *p = '"';
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345
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346 conf->realm.len = len;
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347 conf->realm.data = realm;
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348 }
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349
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350 } else {
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351 conf->realm = prev->realm;
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352 }
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353
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354
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355 if (conf->user_file.data) {
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356 if (ngx_conf_full_name(cf->cycle, &conf->user_file) != NGX_OK) {
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357 return NGX_CONF_ERROR;
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358 }
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359
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360 } else {
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361 conf->user_file = prev->user_file;
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362 }
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363
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364 return NGX_CONF_OK;
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365 }
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366
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367
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368 static ngx_int_t
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369 ngx_http_auth_basic_init(ngx_cycle_t *cycle)
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370 {
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371 ngx_http_handler_pt *h;
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372 ngx_http_core_main_conf_t *cmcf;
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373
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374 cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
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375
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376 h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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377 if (h == NULL) {
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378 return NGX_ERROR;
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379 }
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380
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381 *h = ngx_http_auth_basic_handler;
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382
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383 return NGX_OK;
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384 }
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385
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386
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387 static char *
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388 ngx_http_auth_basic(ngx_conf_t *cf, void *post, void *data)
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389 {
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390 ngx_str_t *realm = data;
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391
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392 if (ngx_strcmp(realm->data, "off") == 0) {
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393 realm->len = 0;
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394 realm->data = (u_char *) "";
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395 }
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396
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397 return NGX_CONF_OK;
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398 }
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