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52
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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, /* pre conf */
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64
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65 NULL, /* create main configuration */
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66 NULL, /* init main configuration */
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67
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68 NULL, /* create server configuration */
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69 NULL, /* merge server configuration */
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70
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71 ngx_http_auth_basic_create_loc_conf, /* create location configuration */
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72 ngx_http_auth_basic_merge_loc_conf /* merge location configuration */
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73 };
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74
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75
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76 ngx_module_t ngx_http_auth_basic_module = {
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77 NGX_MODULE,
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78 &ngx_http_auth_basic_module_ctx, /* module context */
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79 ngx_http_auth_basic_commands, /* module directives */
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80 NGX_HTTP_MODULE, /* module type */
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81 ngx_http_auth_basic_init, /* init module */
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82 NULL /* init process */
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83 };
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84
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85
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86 static ngx_int_t
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87 ngx_http_auth_basic_handler(ngx_http_request_t *r)
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88 {
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89 off_t offset;
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90 ssize_t n;
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91 ngx_fd_t fd;
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92 ngx_str_t auth, encoded, pwd;
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93 ngx_uint_t i, login, len, left, passwd;
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94 ngx_file_t file;
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95 ngx_http_auth_basic_ctx_t *ctx;
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96 ngx_http_auth_basic_loc_conf_t *alcf;
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97 u_char buf[NGX_HTTP_AUTH_BUF_SIZE];
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98 enum {
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99 sw_login,
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100 sw_passwd,
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101 sw_skip
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102 } state;
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103
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104 alcf = ngx_http_get_module_loc_conf(r, ngx_http_auth_basic_module);
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105
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106 if (alcf->realm.len == 0 || alcf->user_file.len == 0) {
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107 return NGX_OK;
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108 }
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109
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110 ctx = ngx_http_get_module_ctx(r, ngx_http_auth_basic_module);
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111
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112 if (ctx) {
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113 return ngx_http_auth_basic_crypt_handler(r, ctx, &ctx->passwd,
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114 &alcf->realm);
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115 }
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116
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117 if (r->headers_in.authorization == NULL) {
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118 return ngx_http_auth_basic_set_realm(r, &alcf->realm);
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119 }
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120
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121 encoded = r->headers_in.authorization->value;
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122
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123 if (encoded.len < sizeof("Basic ") - 1
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124 || ngx_strncasecmp(encoded.data, "Basic ", sizeof("Basic ") - 1) != 0)
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125 {
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126 return ngx_http_auth_basic_set_realm(r, &alcf->realm);
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127 }
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128
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129 encoded.len -= sizeof("Basic ") - 1;
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130 encoded.data += sizeof("Basic ") - 1;
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131
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132 while (encoded.len && encoded.data[0] == ' ') {
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133 encoded.len--;
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134 encoded.data++;
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135 }
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136
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137 if (encoded.len == 0) {
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138 return ngx_http_auth_basic_set_realm(r, &alcf->realm);
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139 }
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140
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141 auth.len = ngx_base64_decoded_length(encoded.len);
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142 auth.data = ngx_palloc(r->pool, auth.len + 1);
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143 if (auth.data == NULL) {
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144 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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145 }
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146
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147 if (ngx_decode_base64(&auth, &encoded) != NGX_OK) {
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148 return ngx_http_auth_basic_set_realm(r, &alcf->realm);
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149 }
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150
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151 auth.data[auth.len] = '\0';
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152
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153 for (len = 0; len < auth.len; len++) {
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154 if (auth.data[len] == ':') {
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155 break;
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156 }
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157 }
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158
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159 if (len == auth.len) {
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160 return ngx_http_auth_basic_set_realm(r, &alcf->realm);
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161 }
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162
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163 r->headers_in.user.len = len;
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164 r->headers_in.user.data = auth.data;
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165 r->headers_in.passwd.len = auth.len - len - 1;
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166 r->headers_in.passwd.data = &auth.data[len + 1];
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167
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168 fd = ngx_open_file(alcf->user_file.data, NGX_FILE_RDONLY, NGX_FILE_OPEN);
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169
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170 if (fd == NGX_INVALID_FILE) {
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171 ngx_log_error(NGX_LOG_ERR, r->connection->log, ngx_errno,
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172 ngx_open_file_n " \"%s\" failed", alcf->user_file.data);
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173 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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174 }
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175
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176 ngx_memzero(&file, sizeof(ngx_file_t));
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177
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178 file.fd = fd;
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179 file.name = alcf->user_file;
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180 file.log = r->connection->log;
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181
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182 state = sw_login;
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183 passwd = 0;
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184 login = 0;
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185 left = 0;
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186 offset = 0;
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187
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188 for ( ;; ) {
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189 n = ngx_read_file(&file, buf + left, NGX_HTTP_AUTH_BUF_SIZE - left,
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190 offset);
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191
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192 if (n == NGX_ERROR) {
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193 ngx_http_auth_basic_close(&file);
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194 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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195 }
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196
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197 if (n == 0) {
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198 break;
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199 }
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200
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201 for (i = left; i < left + n; i++) {
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202 switch (state) {
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203
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204 case sw_login:
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205 if (login == 0 && buf[i] == '#') {
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206 state = sw_skip;
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207 break;
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208 }
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209
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210 if (buf[i] != auth.data[login]) {
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211 state = sw_skip;
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212 break;
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213 }
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214
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215 if (login == len) {
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216 state = sw_passwd;
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217 passwd = i + 1;
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218 }
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219
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220 login++;
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221
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222 break;
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223
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224 case sw_passwd:
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225 if (buf[i] == LF || buf[i] == CR || buf[i] == ':') {
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226 buf[i] = '\0';
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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 pwd.len = i - passwd;
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231 pwd.data = &buf[passwd];
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232
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233 return ngx_http_auth_basic_crypt_handler(r, NULL, &pwd,
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234 &alcf->realm);
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235 }
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236
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237 break;
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238
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239 case sw_skip:
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240 if (buf[i] == LF) {
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241 state = sw_login;
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242 login = 0;
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243 }
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244
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245 break;
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246 }
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247 }
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248
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249 if (state == sw_passwd) {
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250 left = left + n - passwd;
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251 ngx_memcpy(buf, &buf[passwd], left);
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252 passwd = 0;
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253
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254 } else {
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255 left = 0;
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256 }
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257
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258 offset += n;
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259 }
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260
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261 ngx_http_auth_basic_close(&file);
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262
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263 return ngx_http_auth_basic_set_realm(r, &alcf->realm);
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264 }
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265
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266
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267 static ngx_int_t
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268 ngx_http_auth_basic_crypt_handler(ngx_http_request_t *r,
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269 ngx_http_auth_basic_ctx_t *ctx, ngx_str_t *passwd, ngx_str_t *realm)
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270 {
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271 ngx_int_t rc;
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272 u_char *encrypted;
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273
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274 rc = ngx_crypt(r->pool, r->headers_in.passwd.data, passwd->data,
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275 &encrypted);
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276
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277 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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278 "rc: %d user: \"%V\" salt: \"%s\"",
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279 rc, &r->headers_in.user, passwd->data);
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280
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281 if (rc == NGX_OK) {
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282 if (ngx_strcmp(encrypted, passwd->data) == 0) {
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283 return NGX_OK;
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284 }
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285
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286 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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287 "encrypted: \"%s\"", encrypted);
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288
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289 return ngx_http_auth_basic_set_realm(r, realm);
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290 }
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291
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292 if (rc == NGX_ERROR) {
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293 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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294 }
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295
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296 /* rc == NGX_AGAIN */
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297
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298 if (ctx == NULL) {
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299 ctx = ngx_palloc(r->pool, sizeof(ngx_http_auth_basic_ctx_t));
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300 if (ctx == NULL) {
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301 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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302 }
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303
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304 ngx_http_set_ctx(r, ctx, ngx_http_auth_basic_module);
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305
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306 ctx->passwd.len = passwd->len;
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307 passwd->len++;
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308
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309 ctx->passwd.data = ngx_pstrdup(r->pool, passwd);
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310 if (ctx->passwd.data == NULL) {
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311 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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312 }
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313
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314 }
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315
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316 /* TODO: add mutex event */
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317
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318 return rc;
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319 }
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320
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321
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322 static ngx_int_t
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323 ngx_http_auth_basic_set_realm(ngx_http_request_t *r, ngx_str_t *realm)
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324 {
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325 r->headers_out.www_authenticate = ngx_list_push(&r->headers_out.headers);
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326 if (r->headers_out.www_authenticate == NULL) {
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327 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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328 }
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329
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330 r->headers_out.www_authenticate->key.len = sizeof("WWW-Authenticate") - 1;
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331 r->headers_out.www_authenticate->key.data = (u_char *) "WWW-Authenticate";
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332 r->headers_out.www_authenticate->value = *realm;
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333
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334 return NGX_HTTP_UNAUTHORIZED;
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335 }
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336
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337 static void
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338 ngx_http_auth_basic_close(ngx_file_t *file)
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339 {
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340 if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
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341 ngx_log_error(NGX_LOG_ALERT, file->log, ngx_errno,
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342 ngx_close_file_n " \"%s\" failed", file->name.data);
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343 }
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344 }
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345
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346
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347 static void *
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348 ngx_http_auth_basic_create_loc_conf(ngx_conf_t *cf)
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349 {
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350 ngx_http_auth_basic_loc_conf_t *conf;
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351
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352 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_auth_basic_loc_conf_t));
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353 if (conf == NULL) {
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354 return NGX_CONF_ERROR;
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355 }
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356
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357 return conf;
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358 }
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359
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360
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361 static char *
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362 ngx_http_auth_basic_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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363 {
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364 ngx_http_auth_basic_loc_conf_t *prev = parent;
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365 ngx_http_auth_basic_loc_conf_t *conf = child;
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366
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367 size_t len;
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368 u_char *realm, *p;
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369
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370 if (conf->realm.data) {
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371 if (conf->realm.len) {
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372 len = sizeof("Basic realm=\"") - 1 + conf->realm.len + 1;
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373
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374 realm = ngx_palloc(cf->pool, len);
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375 if (realm == NULL) {
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376 return NGX_CONF_ERROR;
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377 }
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378
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379 p = ngx_cpymem(realm, "Basic realm=\"",
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380 sizeof("Basic realm=\"") - 1);
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381 p = ngx_cpymem(p, conf->realm.data, conf->realm.len);
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382 *p = '"';
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383
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384 conf->realm.len = len;
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385 conf->realm.data = realm;
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386 }
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387
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388 } else {
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389 conf->realm = prev->realm;
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390 }
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391
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392
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393 if (conf->user_file.data) {
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394 if (ngx_conf_full_name(cf->cycle, &conf->user_file) != NGX_OK) {
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395 return NGX_CONF_ERROR;
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396 }
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397
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398 } else {
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399 conf->user_file = prev->user_file;
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400 }
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401
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402 return NGX_CONF_OK;
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403 }
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404
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405
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406 static ngx_int_t
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407 ngx_http_auth_basic_init(ngx_cycle_t *cycle)
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408 {
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409 ngx_http_handler_pt *h;
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410 ngx_http_core_main_conf_t *cmcf;
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411
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412 cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
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413
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414 h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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415 if (h == NULL) {
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416 return NGX_ERROR;
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417 }
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418
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419 *h = ngx_http_auth_basic_handler;
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420
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421 return NGX_OK;
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422 }
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423
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424
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425 static char *
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426 ngx_http_auth_basic(ngx_conf_t *cf, void *post, void *data)
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427 {
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428 ngx_str_t *realm = data;
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429
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430 if (ngx_strcmp(realm->data, "off") == 0) {
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431 realm->len = 0;
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432 realm->data = (u_char *) "";
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433 }
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434
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435 return NGX_CONF_OK;
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436 }
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