{"id":2444,"date":"2017-11-11T17:38:09","date_gmt":"2017-11-11T08:38:09","guid":{"rendered":"https:\/\/greentown.tokyo\/?p=2444"},"modified":"2023-06-12T12:03:43","modified_gmt":"2023-06-12T03:03:43","slug":"dotnet-sqlinjection","status":"publish","type":"post","link":"https:\/\/greentown.tokyo\/?p=2444","title":{"rendered":"C# .NET \u30d1\u30e9\u30e1\u30fc\u30bf\u30af\u30a8\u30ea\u3067SQL\u30a4\u30f3\u30af\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u5bfe\u7b56"},"content":{"rendered":"<p>\u753b\u9762\u304b\u3089\u53d7\u3051\u53d6\u308b\u30d1\u30e9\u30e1\u30fc\u30bf\u3092<\/p>\n<pre class=\"lang:default decode:true\">public DataTable Hoge(string hogehoge)\n{\n    string sql;\n    NpgsqlCommand cmd = this.DataService.CreateCommand();\n    cmd.CommandType = CommandType.Text;\n    \n    sql = \"select * from table_a\";\n\n    \/\/ \u2193\u2193\u2193\u3053\u3053\n    sql = sql + \" where hoge like '%\" + hogehoge + \"%'\";\n<\/pre>\n<p>\u3053\u3093\u306a\u98a8\u306bwhere\u53e5\u306b\u6e21\u3059\u3068\u3001SQL\u30a4\u30f3\u30af\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u306b\u3084\u3089\u308c\u3061\u3083\u3046\u3089\u3057\u3044\u3002<\/p>\n<p>\u5b9f\u969b\u3001hogehoge\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u4ee5\u4e0b\u3092\u6e21\u3057\u3066\u307f\u305f\u3089<\/p>\n<p>&#8216; and cast( (select pg_sleep(10)) as varchar) =&#8217;<\/p>\n<pre class=\"lang:default decode:true\">    cmd.CommandText = sql;\n    DataTable datatable;\n    \n    \/\/ \u3053\u3053\u3067 10\u79d2\u6b62\u307e\u308b\u3002\n    datatable = this.DataService.ExecuteSelectCommand(cmd);\n    return datatable;\n}<\/pre>\n<p>\u5b9f\u884c\u6642\u306b10\u79d2\u6b62\u307e\u3063\u305f\u3002<\/p>\n<p>\u666e\u6bb5\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u958b\u767a\u4e2d\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u4e0a\u8a18\u306e\u90e8\u5206\u3060\u3051\u3001\u306a\u3093\u304b\u305d\u3046\u306a\u3063\u3066\u307e\u3057\u305f\u3002<\/p>\n<p>\u30d1\u30e9\u30e1\u30fc\u30bf\u30af\u30a8\u30ea\u4f7f\u3046\u3068\u3001SQL\u30a4\u30f3\u30af\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u5bfe\u7b56\u306b\u306a\u308b\u3089\u3057\u3044\u30c7\u30b9\u3002\u77e5\u3089\u306a\u3044\u3067\u4f7f\u3063\u3066\u3044\u307e\u3057\u305f\u3002<br \/>\nJava\u3068\u304b\u3060\u3068\u30d7\u30ea\u30da\u30a2\u30c9\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3068\u304b\u3044\u3046\u3089\u3057\u3044\u3002\u307b\u3093\u3068\uff1f<\/p>\n<p>\u30bb\u30ad\u30e5\u30a2\u306a\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u5fc3\u304c\u3051\u306a\u3044\u3068\u3067\u3059\u3002<\/p>\n<p>\u30d1\u30e9\u30e1\u30fc\u30bf\u30af\u30a8\u30ea<br \/>\nNpgsqlCommand.Parameters.Add<\/p>\n<p>\u2191 \u3053\u308c\u3001LIKE\u306a\u30ec\u30b3\u30fc\u30c9\u306f\u62fe\u3063\u3066\u304f\u308c\u306a\u3044\u306e\u3067<\/p>\n<p>\u90e8\u5206\u691c\u7d22\u306f\u3001\u3053\u3061\u3089\u3092\u4f7f\u3044\u307e\u3059\u3002<br \/>\nNpgsqlCommand.Parameters.AddWithValue<\/p>\n<p>\u4fee\u6b63\u5f8c\u306e\u30d7\u30ed\u30b0\u30e9\u30e0<\/p>\n<pre class=\"lang:default decode:true\">public DataTable Hoge(string hogehoge)\n{\n    string sql;\n    NpgsqlCommand cmd = this.DataService.CreateCommand();\n    cmd.CommandType = CommandType.Text;\n    \n    sql = \"select * from table_a\";\n    \n    \/\/ \u4fee\u6b63\n    sql = sql + \" where hoge like @hogehoge\";\n    \n    \/\/ \u8ffd\u52a0\n    cmd.Parameters.AddWithValue (\"@hoge\", \"%\" + hogehoge + \"%\");\n\n    cmd.CommandText = sql;\n    DataTable datatable;\n    datatable = this.DataService.ExecuteSelectCommand(cmd);\n    return datatable;\n}<\/pre>\n<p>\u4fee\u6b63\u5f8c<\/p>\n<p>&#8216; and cast( (select pg_sleep(10)) as varchar) =&#8217;<\/p>\n<p>\u3053\u308c\u6295\u3052\u3066\u3082\u3001\u3068\u307e\u3089\u306a\u304f\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001DB\u306fPostgreSQL\u3067\u3059\u3002<\/p>\n<p>\u304a\u3057\u307e\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u753b\u9762\u304b\u3089\u53d7\u3051\u53d6\u308b\u30d1\u30e9\u30e1\u30fc\u30bf\u3092 public DataTable Hoge(string hogehoge) { string sql; NpgsqlCommand cmd = this.DataSer &#8230; <\/p>\n","protected":false},"author":1,"featured_media":2448,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[76],"tags":[],"class_list":["post-2444","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-asp-dotnet"],"_links":{"self":[{"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/posts\/2444"}],"collection":[{"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2444"}],"version-history":[{"count":8,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/posts\/2444\/revisions"}],"predecessor-version":[{"id":6115,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/posts\/2444\/revisions\/6115"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/media\/2448"}],"wp:attachment":[{"href":"https:\/\/greentown.tokyo\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2444"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}