{"id":440,"date":"2015-07-27T14:07:16","date_gmt":"2015-07-27T06:07:16","guid":{"rendered":"http:\/\/www.ipcpu.com\/?p=440"},"modified":"2015-07-27T14:07:16","modified_gmt":"2015-07-27T06:07:16","slug":"shell-restricted-shell","status":"publish","type":"post","link":"https:\/\/c.ipcpu.com\/2015\/07\/shell-restricted-shell\/","title":{"rendered":"Linux bash\u53d7\u9650\u7684shell(RESTRICTED SHELL)"},"content":{"rendered":"<p>Linux bash\u53d7\u9650\u7684shell(RESTRICTED SHELL)<\/p>\n<h2 id=\"-shell\">\u4ec0\u4e48\u662f\u53d7\u9650\u7684shell<\/h2>\n<p>\u5982\u679cbash\u4ee5rbash\u540d\u79f0\u542f\u52a8\uff0c\u6216\u8005\u542f\u52a8\u65f6\u4f7f\u7528\u4e86-r\u9009\u9879\uff0c\u90a3\u4e48\u5b83\u6210\u4e3a\u53d7\u9650\u7684 shell\u3002<br \/>\u53d7\u9650\u7684 shell \u4e00\u822c\u7528\u6765\u5efa\u7acb\u4e00\u4e2a\u6bd4\u6807\u51c6\u7684 shell \u53d7\u5230\u66f4\u591a\u63a7\u5236\u7684\u73af\u5883\u3002<\/p>\n<p>\u5b83\u7684\u884c\u4e3a\u4e0ebash\u4e00\u81f4\uff0c\u9664\u4e86\u4e0b\u5217\u884c\u4e3a\u662f\u4e0d\u5141\u8bb8\u7684 (disallowed) \u6216\u4e0d\u4f1a\u8fd0\u884c\u7684 (not performed)\u3002<\/p>\n<blockquote>\n<ul>\n<li>\u4f7f\u7528 cd \u6765\u6539\u53d8\u8def\u5f84\uff1b<\/li>\n<li>\u8bbe\u7f6e\u6216\u53d6\u6d88SHELL,PATH,ENV,\u6216BASH_ENV\u53d8\u91cf\u7684\u503c\uff1b<\/li>\n<li>\u6307\u5b9a\u7684\u547d\u4ee4\u540d\u4e2d\u5305\u542b\/\uff1b<\/li>\n<li>\u6307\u5b9a\u5305\u542b\/\u7684\u6587\u4ef6\u540d\u4f5c\u4e3a\u4f20\u9012\u7ed9\u5185\u5efa\u547d\u4ee4.\u7684\u53c2\u6570\uff1b<\/li>\n<li>\u6307\u5b9a\u5305\u542b\u659c\u6760 (slash) \u7684\u6587\u4ef6\u540d\u4f5c\u4e3a-p\u9009\u9879\u7684\u53c2\u6570\uff0c\u4f20\u9012\u7ed9hash\u5185\u5efa\u547d\u4ee4\uff1b<\/li>\n<li>\u542f\u52a8\u65f6\u4ece shell \u73af\u5883\u4e2d\u5bfc\u5165 (import) \u51fd\u6570\u5b9a\u4e49\uff1b<\/li>\n<li>\u542f\u52a8\u65f6\u89e3\u91ca shell \u73af\u5883\u4e2d SHELLOPTS \u7684\u503c\uff1b<\/li>\n<li>\u4f7f\u7528 &gt;, &gt;|, &lt;&gt;, &gt;&amp;, &amp;&gt;, \u548c &gt;&gt; \u7b49\u91cd\u5b9a\u5411\u64cd\u4f5c\u7b26\u91cd\u5b9a\u5411\u8f93\u51fa\uff1b<\/li>\n<li>\u4f7f\u7528exec\u5185\u5efa\u547d\u4ee4\u6765\u4ee5\u53e6\u4e00\u4e2a\u547d\u4ee4\u66ff\u6362 shell\uff1b<\/li>\n<li>\u4f7f\u7528enable\u5185\u5efa\u547d\u4ee4\u7684-f\u548c-d\u9009\u9879\u6765\u589e\u52a0\u548c\u5220\u9664\u5185\u5efa\u547d\u4ee4\uff1b<\/li>\n<li>\u4f7f\u7528 enable \u5185\u5efa\u547d\u4ee4\u6765\u5141\u8bb8\u548c\u7981\u6b62 shell \u5185\u5efa\u547d\u4ee4\uff1b<\/li>\n<li>\u6307\u5b9acommand\u5185\u5efa\u547d\u4ee4\u7684-p\u9009\u9879\uff1b<\/li>\n<li>\u4f7f\u7528 set +r \u6216 set +o restricted \u6765\u5173\u95ed\u53d7\u9650\u6a21\u5f0f\u3002<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u8fd9\u4e9b\u9650\u5236\u5728\u6240\u6709\u542f\u52a8\u6587\u4ef6\u8bfb\u53d6\u4e4b\u540e\u624d\u4f1a\u751f\u6548\u3002<\/p>\n<h2 id=\"-shell\">\u5982\u4f55\u542f\u52a8\u53d7\u9650\u5236\u7684shell<\/h2>\n<pre class=\"prettyprint linenums language-undefined prettyprinted\" style=\"\"><ol class=\"linenums\" style=\"padding-left: 0px;\"><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L0\"><code><span class=\"pln\">cp <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bash  <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">rbash<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L1\"><code><span class=\"pln\">useradd <\/span><span class=\"pun\">-<\/span><span class=\"pln\">s <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">rbash user001<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L2\"><code><span class=\"com\">#user001@\u7528\u6237user001\u767b\u9646\u4e4b\u540e\u5373\u8fdb\u5165\u53d7\u9650shell<\/span><\/code><\/li><\/ol><\/pre>\n<p>\u4e3a\u4e86\u4f7f\u7528\u6237user001\u80fd\u6267\u884c\u4e00\u4e9b\u547d\u4ee4\uff0c\u6211\u4eec\u53ef\u4ee5\u505a\u4e00\u4e9b\u8f6f\u94fe\u63a5<\/p>\n<pre class=\"prettyprint linenums language-undefined prettyprinted\" style=\"\"><ol class=\"linenums\" style=\"padding-left: 0px;\"><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L0\"><code><span class=\"pln\">mkdir <\/span><span class=\"pun\">-<\/span><span class=\"pln\">p <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">home<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">user001<\/span><span class=\"pun\">\/.<\/span><span class=\"pln\">bin<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L1\"><code><span class=\"pln\">cd <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">home<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">user001<\/span><span class=\"pun\">\/.<\/span><span class=\"pln\">bin<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L2\"><code><span class=\"pln\">ln <\/span><span class=\"pun\">-<\/span><span class=\"pln\">s <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">su  su<\/span><\/code><\/li><\/ol><\/pre>\n<p>\u6253\u5f00 \/home\/user001\/.bash_profile<br \/>\u5220\u6389\u6240\u6709BASH\u5185\u5bb9\uff0c\u6dfb\u52a01\u884c<\/p>\n<pre class=\"prettyprint linenums language-undefined prettyprinted\" style=\"\"><ol class=\"linenums\" style=\"padding-left: 0px;\"><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L0\"><code><span class=\"kwd\">export<\/span><span class=\"pln\"> PATH<\/span><span class=\"pun\">=<\/span><span class=\"pln\">$HOME<\/span><span class=\"pun\">\/.<\/span><span class=\"pln\">bin<\/span><\/code><\/li><\/ol><\/pre>\n<h2 id=\"-shell\">\u6d4b\u8bd5\u4e00\u4e2a\u53d7\u9650\u7684shell<\/h2>\n<p>\u6d4b\u8bd5\u8fd0\u884c\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<pre class=\"prettyprint linenums language-undefined prettyprinted\" style=\"\"><ol class=\"linenums\" style=\"padding-left: 0px;\"><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L0\"><code><span class=\"pun\">[<\/span><span class=\"pln\">user001@zjm<\/span><span class=\"pun\">-<\/span><span class=\"lit\">17<\/span><span class=\"pln\"> test<\/span><span class=\"pun\">]<\/span><span class=\"pln\">$ cd <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L1\"><code><span class=\"pln\">bash<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> cd<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> restricted<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L2\"><code><span class=\"pun\">[<\/span><span class=\"pln\">user001@zjm<\/span><span class=\"pun\">-<\/span><span class=\"lit\">17<\/span><span class=\"pln\"> test<\/span><span class=\"pun\">]<\/span><span class=\"pln\">$ ps<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L3\"><code><span class=\"pun\">-<\/span><span class=\"pln\">rbash<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> ps<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> command <\/span><span class=\"kwd\">not<\/span><span class=\"pln\"> found<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L4\"><code><span class=\"pun\">[<\/span><span class=\"pln\">user001@zjm<\/span><span class=\"pun\">-<\/span><span class=\"lit\">17<\/span><span class=\"pln\"> test<\/span><span class=\"pun\">]<\/span><span class=\"pln\">$ PATH<\/span><span class=\"pun\">=<\/span><span class=\"pln\">$PATH<\/span><span class=\"pun\">:<\/span><span class=\"str\">\/bin:\/<\/span><span class=\"pln\">sbin<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L5\"><code><span class=\"pln\">bash<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> PATH<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> <\/span><span class=\"kwd\">readonly<\/span><span class=\"pln\"> variable<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L6\"><code><span class=\"pun\">[<\/span><span class=\"pln\">user001@zjm<\/span><span class=\"pun\">-<\/span><span class=\"lit\">17<\/span><span class=\"pln\"> test<\/span><span class=\"pun\">]<\/span><span class=\"pln\">$ <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">vi <\/span><span class=\"pun\">-<\/span><span class=\"pln\">h<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L7\"><code><span class=\"pln\">bash<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> <\/span><span class=\"str\">\/bin\/<\/span><span class=\"pln\">vi<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> restricted<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> cannot specify <\/span><span class=\"pun\">\/<\/span><span class=\"pln\"> <\/span><span class=\"kwd\">in<\/span><span class=\"pln\"> command names<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L8\"><code><span class=\"pun\">[<\/span><span class=\"pln\">user001@zjm<\/span><span class=\"pun\">-<\/span><span class=\"lit\">17<\/span><span class=\"pln\"> test<\/span><span class=\"pun\">]<\/span><span class=\"pln\">$ su <\/span><span class=\"pun\">-<\/span><span class=\"pln\"> test<\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L9\"><code><span class=\"typ\">Password<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> <\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L0\"><code><span class=\"pun\">[<\/span><span class=\"pln\">test@zjm<\/span><span class=\"pun\">-<\/span><span class=\"lit\">17<\/span><span class=\"pln\"> <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ <\/span><\/code><\/li><li style=\"list-style-type: none; padding-left: 0px;\" class=\"L1\"><code><span class=\"com\">#@\u8be5\u7528\u6237\u53ea\u80fd\u6267\u884csu\u547d\u4ee4<\/span><\/code><\/li><\/ol><\/pre>\n<h2 id=\"-shell-\">\u53d7\u9650shell\u7684\u5b89\u5168<\/h2>\n<p>\u7ef4\u57fa\u767e\u79d1\u4e0a\uff08\u53c2\u8003\u94fe\u63a51\uff09\u63d0\u5230\u4e86\u53d7\u9650shell\u9003\u9038\u65b9\u5f0f\uff0c\u56e0\u6b64\u5bf9\u4e8e\u53d7\u9650shell\u7684\u53ef\u6267\u884c\u547d\u4ee4\u8981\u6709\u4e25\u683c\u7684\u8fc7\u6ee4\u3002<br \/>bash  vi  vim \u90fd\u4e0d\u80fd\u653e\u5230\u53ef\u6267\u884c\u5217\u8868\u4e2d\u3002<\/p>\n<h2 id=\"-\">\u53c2\u8003\u94fe\u63a5<\/h2>\n<p><a href=\"http:\/\/en.wikipedia.org\/wiki\/Restricted_shell#Weaknesses_of_a_restricted_shell\">http:\/\/en.wikipedia.org\/wiki\/Restricted_shell#Weaknesses_of_a_restricted_shell<\/a><\/p>\n<div><a title=\"\u6765\u81ea\u4e3a\u77e5\u7b14\u8bb0(Wiz)\" href=\"http:\/\/www.wiz.cn\/i\/5d3b9684\">\u6765\u81ea\u4e3a\u77e5\u7b14\u8bb0(Wiz)<\/a><\/div>\n<p>\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a<a href=\"https:\/\/c.ipcpu.com\">IPCPU-\u7f51\u7edc\u4e4b\u8def<\/a> &raquo; <a href=\"https:\/\/c.ipcpu.com\/2015\/07\/shell-restricted-shell\/\">Linux bash\u53d7\u9650\u7684shell(RESTRICTED SHELL)<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Linux bash\u53d7\u9650\u7684shell(RESTRICTED SHELL) \u4ec0\u4e48\u662f\u53d7\u9650\u7684shell \u5982\u679cbash\u4ee5rbash\u540d\u79f0\u542f\u52a8\uff0c\u6216\u8005\u542f\u52a8\u65f6\u4f7f\u7528\u4e86-r\u9009\u9879\uff0c\u90a3\u4e48\u5b83\u6210\u4e3a\u53d7\u9650\u7684 shell\u3002\u53d7\u9650\u7684 shell \u4e00\u822c\u7528\u6765\u5efa\u7acb\u4e00\u4e2a\u6bd4\u6807\u51c6\u7684 shell \u53d7\u5230\u66f4\u591a\u63a7\u5236\u7684\u73af\u5883\u3002 \u5b83\u7684\u884c\u4e3a\u4e0ebash\u4e00\u81f4\uff0c\u9664\u4e86\u4e0b\u5217\u884c\u4e3a\u662f\u4e0d\u5141\u8bb8\u7684 (disallowed) \u6216\u4e0d\u4f1a\u8fd0\u884c\u7684 (not performed)\u3002 \u4f7f\u7528 cd \u6765\u6539\u53d8\u8def\u5f84\uff1b \u8bbe\u7f6e\u6216\u53d6\u6d88SHELL,PATH,ENV,\u6216BASH_ENV\u53d8\u91cf\u7684\u503c\uff1b \u6307\u5b9a\u7684\u547d\u4ee4\u540d\u4e2d\u5305\u542b\/\uff1b \u6307\u5b9a\u5305\u542b\/\u7684\u6587\u4ef6\u540d\u4f5c\u4e3a\u4f20\u9012\u7ed9\u5185\u5efa\u547d\u4ee4.\u7684\u53c2\u6570\uff1b \u6307\u5b9a\u5305\u542b\u659c\u6760 (slash) \u7684\u6587\u4ef6\u540d\u4f5c\u4e3a-p\u9009\u9879\u7684\u53c2\u6570\uff0c\u4f20\u9012\u7ed9hash\u5185\u5efa\u547d\u4ee4\uff1b \u542f\u52a8\u65f6\u4ece shell \u73af\u5883\u4e2d\u5bfc\u5165 (import) \u51fd\u6570\u5b9a\u4e49\uff1b \u542f\u52a8\u65f6\u89e3\u91ca shell \u73af\u5883\u4e2d SHELLOPTS \u7684\u503c\uff1b \u4f7f\u7528 &gt;, &gt;|, &lt;&gt;, &gt;&amp;, &amp;&gt;, \u548c &gt;&gt; \u7b49\u91cd\u5b9a\u5411\u64cd\u4f5c\u7b26\u91cd\u5b9a\u5411\u8f93\u51fa\uff1b \u4f7f\u7528exec\u5185\u5efa\u547d\u4ee4\u6765\u4ee5\u53e6\u4e00\u4e2a\u547d\u4ee4\u66ff\u6362 shell\uff1b \u4f7f\u7528enable\u5185\u5efa\u547d\u4ee4\u7684-f\u548c-d\u9009\u9879\u6765\u589e\u52a0\u548c\u5220\u9664\u5185\u5efa\u547d\u4ee4\uff1b \u4f7f\u7528 enable \u5185\u5efa\u547d\u4ee4\u6765\u5141\u8bb8\u548c\u7981\u6b62 shell \u5185\u5efa\u547d\u4ee4\uff1b \u6307\u5b9acommand\u5185\u5efa\u547d\u4ee4\u7684-p\u9009\u9879\uff1b \u4f7f\u7528 set +r [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[13],"tags":[17,42,15],"_links":{"self":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/440"}],"collection":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/comments?post=440"}],"version-history":[{"count":0,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/440\/revisions"}],"wp:attachment":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/media?parent=440"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/categories?post=440"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/tags?post=440"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}