{"id":4562,"date":"2015-07-03T10:08:35","date_gmt":"2015-07-03T02:08:35","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=4562"},"modified":"2015-11-03T22:50:50","modified_gmt":"2015-11-03T14:50:50","slug":"%e5%ae%a1%e8%ae%a1%e7%b3%bb%e7%bb%9f%e5%9c%a8%e5%86%85%e6%a0%b8%e7%9a%84%e5%ae%9e%e7%8e%b0-%e5%9f%ba%e6%9c%ac%e6%a1%86%e6%9e%b6","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/4562","title":{"rendered":"\u5ba1\u8ba1\u7cfb\u7edf\u5728\u5185\u6838\u7684\u5b9e\u73b0-\u57fa\u672c\u6846\u67b6"},"content":{"rendered":"

\u5ba1\u8ba1\u7cfb\u7edf\u5728\u5185\u6838\u7684\u5b9e\u73b0\u90e8\u5206\u4e3b\u8981\u5305\u62ec\u662f\u5ba1\u8ba1\u5185\u6838\u6a21\u5757\u3001kauditd\u5185\u6838\u7ebf\u7a0b\u3001\u8fdb\u7a0b\u5ba1\u8ba1\u548c\u6587\u4ef6\u7cfb\u7edf\u7684\u5ba1\u8ba1\u3002\u5ba1\u8ba1\u7cfb\u7edf\u7684\u5185\u6838\u6001\u5b50\u7cfb\u7edf\u4e0d\u4ec5\u8981\u80fd\u591f\u54cd\u5e94\u7528\u6237\u6001\u6240\u53d1\u9001\u7684\u8bf7\u6c42\uff08\u6bd4\u5982\u589e\u52a0\u6216\u5220\u9664\u5ba1\u8ba1\u89c4\u5219\uff09\uff0c\u5e76\u4e14\u8fd8\u8981\u5728\u5185\u6838\u53d1\u751f\u5ba1\u8ba1\u89c4\u5219\u6240\u6307\u5b9a\u7684\u4e8b\u4ef6\u65f6\u8bb0\u5f55\u5e76\u751f\u6210\u65e5\u5fd7\u3002<\/p>\n

\u672c\u6587\u5c06\u5bf9\u5ba1\u8ba1\u7cfb\u7edf\u5728Linux\u5185\u6838\u4e2d\u7684\u5b9e\u73b0\u505a\u7b80\u5355\u8bf4\u660e\uff0c\u91cd\u70b9\u8bf4\u660e\u5ba1\u8ba1\u5185\u6838\u6a21\u5757\u548ckuaditd\u5185\u6838\u7ebf\u7a0b\u7684\u57fa\u672c\u5b9e\u73b0\u3002<\/p>\n

1.\u5ba1\u8ba1\u5185\u6838\u6a21\u5757\u7684\u5b9e\u73b0<\/h2>\n

\u5ba1\u8ba1\u5185\u6838\u6a21\u5757\u662f\u5ba1\u8ba1\u7cfb\u7edf\u5728\u5185\u6838\u7684\u4e3b\u4f53\u7a0b\u5e8f\uff0c\u5b83\u4e3b\u8981\u8d1f\u8d23\u54cd\u5e94\u7528\u6237\u6001\u6240\u53d1\u9001\u7684\u8bf7\u6c42\u3002\u6bd4\u5982\uff0c\u7528\u6237\u6001\u7684auditctl\u547d\u4ee4\u7528\u4e8e\u83b7\u53d6\u5ba1\u8ba1\u7cfb\u7edf\u7684\u72b6\u6001\uff0c\u4ee5\u53ca\u589e\u52a0\u6216\u5220\u9664\u5ba1\u8ba1\u89c4\u5219\uff0c\u8be5\u547d\u4ee4\u5bf9\u6570\u636e\u7684\u83b7\u53d6\u548c\u8bbe\u7f6e\u662f\u4e0e\u5ba1\u8ba1\u6a21\u5757\u8fdb\u884c\u6570\u636e\u4ea4\u4e92\u800c\u5b9e\u73b0\u7684\u3002<\/p>\n

1.1.\u57fa\u672c\u5b9e\u73b0<\/h3>\n

1.1.1.audit_init()<\/strong><\/p>\n

\u5ba1\u8ba1\u5728\u5185\u6838\u4e2d\u7684\u5b9e\u73b0\u5305\u62ec\u8bb8\u591a\u65b9\u9762\uff0c\u4e0d\u4ec5\u5305\u62ec\u5ba1\u8ba1\u5185\u6838\u6a21\u5757\uff0c\u8fd8\u5305\u62ec\u5206\u5e03\u5728\u8fdb\u7a0b\u3001\u6587\u4ef6\u7b49\u5b50\u7cfb\u7edf\u4e2d\u7684\u5b9e\u73b0\u3002\u5ba1\u8ba1\u5185\u6838\u6a21\u5757\u662f\u5ba1\u8ba1\u7cfb\u7edf\u5728\u5185\u6838\u4e2d\u7684\u4e3b\u4f53\u6846\u67b6\uff0c\u5b83\u4e0d\u4ec5\u5bf9\u5ba1\u8ba1\u7cfb\u7edf\u4e2d\u6240\u9700\u7684\u6570\u636e\u7ed3\u6784\u8fdb\u884c\u4e86\u521d\u59cb\u5316\uff0c\u800c\u4e14\u4e3b\u8981\u5b9e\u73b0\u5bf9\u7528\u6237\u6001\u8bf7\u6c42\u7684\u5904\u7406\u3002<\/p>\n

\u5ba1\u8ba1\u6a21\u5757\u7684\u521d\u59cb\u5316\u51fd\u6570\u4e3aaudit_init\uff0c\u5b83\u7684\u4e3b\u8981\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n

1.\u9996\u5148\u901a\u8fc7netlink_kernel_create()\u521b\u5efanetlink\u5957\u63a5\u5b57audit_sock\uff0c\u5e76\u4e14\u6ce8\u518c\u4e86\uff08\u9488\u5bf9\u7528\u6237\u6001\uff09\u6570\u636e\u7684\u5904\u7406\u51fd\u6570audit_receive\uff0c\u5b83\u5c06\u63a5\u6536\u5e76\u5904\u7406\u7528\u6237\u6001\u53d1\u9001\u7684netlink\u6570\u636e\u5305\uff1b<\/p>\n

2.\u521d\u59cb\u5316\u5ba1\u8ba1\u7cfb\u7edf\u6240\u9700\u7684\u94fe\u8868\u548c\u53d8\u91cf\u7b49\u5185\u5bb9,\u5176\u4e2daudit_skb_queue\u94fe\u8868\u7528\u4e8e\u4fdd\u5b58\u5ba1\u8ba1\u5957\u63a5\u5b57\u7f13\u51b2\u533a\uff1b<\/p>\n

3.\u901a\u8fc7audit_log()\u751f\u6210\u672c\u6b21\u521d\u59cb\u5316\u5bf9\u5e94\u7684\u5ba1\u8ba1\u65e5\u5fd7\uff1b<\/p>\n

4.\u521d\u59cb\u5316\u57fa\u4e8einode\u7684\u5ba1\u8ba1\u89c4\u5219\u6240\u5bf9\u5e94\u7684\u54c8\u5e0c\u94fe\u8868\uff1b<\/p>\n

1.1.2.audit_receive()<\/strong><\/p>\n

audit_receive\u5185\u90e8\u5c01\u88c5\u4e86audit_receive_skb\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u7684\u5b9e\u73b0\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n

1.netlink\u5957\u63a5\u5b57\u6240\u53d1\u9001\u7684\u6570\u636e\u62a5\u6587\u683c\u5f0f\u4e3anlmsghdr\u7ed3\u6784\u7684\u5305\u5934+\u6307\u5b9a\u683c\u5f0f\u7684\u51c0\u8377\u6570\u636e\uff1b\u56e0\u6b64\uff0c\u8be5\u51fd\u6570\u9996\u5148\u6309\u7167\u534f\u8bae\u53d6\u6570\u636e\u62a5\u5934\u548c\u6574\u4e2a\u6570\u636e\u62a5\u6587\u957f\u5ea6\uff0c\u4ea4\u7531audit_receive_msg\u51fd\u6570\u5904\u7406\uff1b<\/p>\n

2.\u5982\u679c\u6570\u636e\u5305\u5904\u7406\u5b8c\u6210\uff0c\u901a\u8fc7netlink_ack\u51fd\u6570\u5411\u7528\u6237\u6001\u53d1\u9001\u54cd\u5e94\uff1b<\/p>\n

3.\u901a\u8fc7NLMSG_NEXT\u83b7\u53d6\u4e0b\u4e00\u4e2a\u6570\u636e\u62a5\uff1b<\/p>\n

1.1.3.audit_receive_msg()<\/strong><\/p>\n

\u8be5\u51fd\u6570\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u6d88\u606f\u5206\u53d1\u5904\u7406\u5668\uff0c\u6839\u636e\u6570\u636e\u62a5\u5934\u90e8\u7684nlmsg_type\u8fdb\u884c\u6d88\u606f\u5206\u53d1\u5904\u7406\u3002\u5177\u4f53\u7684\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n

1.\u4ecenetlink\u62a5\u6587\u5934\u90e8\u83b7\u53d6\u5f53\u524d\u6d88\u606f\u7c7b\u578bmsg_type\uff1b<\/p>\n

2.\u901a\u8fc7audit_netlink_ok\u51fd\u6570\u68c0\u67e5\u5f53\u524d\u7684\u6d88\u606f\u7c7b\u578b\u662f\u5426\u5408\u6cd5\uff1b\u5982\u4e0d\u5408\u6cd5\uff0c\u5219\u9000\u51fa\uff1b<\/p>\n

3.\u68c0\u67e5kauditd\u5185\u6838\u7ebf\u7a0b\u662f\u5426\u5df2\u542f\u52a8\uff0c\u5982\u679c\u6ca1\u6709\u542f\u52a8\u5219\u901a\u8fc7kthread_run()\u542f\u52a8\u8be5\u7ebf\u7a0b\uff1bkauditd\u7ebf\u7a0b\u7528\u4e8e\u5c06\u5185\u6838\u4e2d\u7684\u5ba1\u8ba1\u65e5\u5fd7\u53d1\u9001\u5230\u7528\u6237\u6001\u4e2d\uff1b<\/p>\n

4.\u6839\u636e\u5f53\u524d\u7684\u5957\u63a5\u5b57\u7f13\u51b2\u533askb\u548c\u5f53\u524d\u8fdb\u7a0bcurrent\u83b7\u53d6\u5ba1\u8ba1\u6240\u9700\u7684\u6570\u636e\uff0c\u6bd4\u5982pid\u3001uid\u548cloginuid\u7b49\u4fe1\u606f\uff1b<\/p>\n

5.\u6839\u636e\u6d88\u606f\u7c7b\u578b\u8fdb\u884c\u6d88\u606f\u5206\u53d1\u548c\u5904\u7406\uff1b<\/p>\n

1.2.\u65e5\u5fd7\u7684\u8bb0\u5f55<\/h3>\n

\u5ba1\u8ba1\u7cfb\u7edf\u5728\u5185\u6838\u4e2d\u901a\u8fc7audit_buffer\u7ed3\u6784\u8868\u793a\u4e00\u4e2a\u5ba1\u8ba1\u65e5\u5fd7\u7f13\u51b2\u533a\uff0c\u5b83\u7684\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n

\r\nstruct audit_buffer {\r\nstruct list_head list;\r\nstruct sk_buff *skb; \/* formatted skb ready to send *\/\r\nstruct audit_context *ctx; \/* NULL or associated context *\/\r\ngfp_t gfp_mask;\r\n};\r\n<\/pre>\n
list\u4e3a\u94fe\u8868\u8282\u70b9\uff1b\u6240\u6709\u7684\u5ba1\u8ba1\u65e5\u5fd7\u7f13\u51b2\u533a\u901a\u8fc7\u94fe\u8868\u8fde\u63a5\uff1b<\/p>\n
skb\u4e3a\u5957\u63a5\u5b57\u7f13\u51b2\u533a\uff1b\u7531\u4e8e\u5ba1\u8ba1\u7cfb\u7edf\u901a\u8fc7netlink\u673a\u5236\u5b9e\u73b0\u7528\u6237\u6001\u548c\u5185\u6838\u6001\u7684\u6570\u636e\u4ea4\u4e92\uff0c\u56e0\u6b64\u9700\u6c42\u5c01\u88c5\u5957\u63a5\u5b57\u7f13\u51b2\u533a\uff1b<\/p>\n
ctx\u8868\u793a\u5ba1\u8ba1\u4e0a\u4e0b\u6587\uff1b\u5f53\u5ba1\u8ba1\u7cfb\u7edf\u8fdb\u884c\u8fdb\u7a0b\u76d1\u63a7\u65f6\uff0cctx\u5c06\u4fdd\u5b58\u8fdb\u7a0b\u7684\u76f8\u5173\u4fe1\u606f\uff1b<\/p>\n
gfp_mask\u662f\u5185\u6838\u7533\u8bf7\u5185\u5b58\u65f6\u7684\u6807\u5fd7\uff1b\u8868\u793a\u4e3aaudit_buffer\u5728\u54ea\u7247\u5185\u5b58\u533a\u7533\u8bf7\u5185\u5b58\uff1b<\/p>\n
\u5185\u6838\u901a\u8fc7\u4e00\u7ec4\u63a5\u53e3\u5bf9\u5ba1\u8ba1\u65e5\u5fd7\u7f13\u51b2\u533a\u8fdb\u884c\u64cd\u4f5c\u3002\u5f53\u5ba1\u8ba1\u4e8b\u4ef6\u53d1\u751f\u65f6\uff0c\u901a\u8fc7audit_log_start()\u4e3a\u8be5\u6761\u65e5\u5fd7\u5206\u914daudit_buffer\u7ed3\u6784\u7684\u7f13\u51b2\u533a\uff1b\u6839\u636e\u5177\u4f53\u7684\u5ba1\u8ba1\u4e8b\u4ef6\uff0caudit_log_vformat()\u5c06\u5ba1\u8ba1\u4e8b\u4ef6\u53d1\u751f\u65f6\u8981\u663e\u793a\u7684\u6570\u636e\u4ee5\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u7684\u5f62\u5f0f\u5199\u5165\u7f13\u51b2\u533a\u5185\uff1b\u6700\u7ec8\uff0caudit_log_end()\u5c06\u7f13\u51b2\u533a\uff08\u5ba1\u8ba1\u7f13\u51b2\u533aaudit_buffer\uff09\u52a0\u5165\u7f13\u51b2\u533a(\u5ba1\u8ba1\u5957\u63a5\u5b57\u7f13\u51b2\u533ask_buffer)\u94fe\u8868audit_skb_queue\u4e2d\u3002\u94fe\u8868audit_skb_queue\u4e2d\u7684\u7f13\u51b2\u533a\u7531\u5185\u6838\u7ebf\u7a0bkauditd\u53d1\u9001\u81f3\u7528\u6237\u6001auditd\u8fdb\u7a0b\u3002<\/p>\n
1.2.1.audit_log_start()<\/strong><\/p>\n
\u8be5\u51fd\u6570\u4e3b\u8981\u7528\u4e8e\u5206\u914d\u65e5\u5fd7\u7f13\u51b2\u533a\uff0c\u4f46\u662f\u5982\u679c\u5f53\u524d\u7f13\u51b2\u533a\u94fe\u8868\u4e2d\u7684\u592a\u591a\uff0c\u5c06\u963b\u585e\u5f53\u524d\u8fdb\u7a0b\u3002\u5177\u4f53\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n
1.\u901a\u8fc7audit_filter_type()\u68c0\u67e5\u5f53\u524d\u65e5\u5fd7\u7c7b\u578b\u662f\u5426\u88ab\u6307\u5b9a\u4e3a\u8fc7\u6ee4\uff0c\u5982\u679c\u662f\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\uff1b<\/p>\n
2.\u5982\u679c\u5f53\u524d\u7f13\u51b2\u533a\u5217\u8868audit_skb_queue\u4e2d\u5b58\u5728\u7684\u8282\u70b9\u6570\u76ee\u5927\u4e8e\u6307\u5b9a\u7684audit_backlog_limit\u5927\u5c0f\uff0c\u5219\u5f53\u524d\u7684\u8fdb\u7a0b\u5c06\u4f1a\u88ab\u963b\u585e\uff1b\u5373\u521b\u5efa\u7b49\u5f85\u961f\u5217\u5b9e\u4f8b\uff0c\u6539\u53d8\u5f53\u524d\u8fdb\u7a0b\u7684\u72b6\u6001\u4e3aTASK_UNINTERRUPTIBLE\uff0c\u5e76\u4e14\u5c06\u5176\u52a0\u5165\u5230\u7b49\u5f85\u961f\u5217audit_backlog_wait\u4e2d\uff1b\u6b64\u65f6\uff0c\u518d\u6b21\u68c0\u67e5\u7f13\u51b2\u533a\u5217\u8868\u4e2d\u7684\u6570\u636e\u662f\u5426\u5927\u4e8e\u6240\u6307\u5b9a\u7684audit_backlog_limit\uff0c\u5982\u679c\u662f\uff0c\u5219\u4e3b\u52a8\u53d1\u8d77\u91cd\u65b0\u8c03\u5ea6\uff1b\u5426\u5219\uff0c\u5c06\u5220\u9664\u521a\u624d\u521b\u5efa\u7684\u7b49\u5f85\u961f\u5217\u5b9e\u4f8b\uff0c\u5e76\u4e14\u6062\u590d\u8fdb\u7a0b\u7684\u72b6\u6001\uff1b<\/p>\n
3.\u6b64\u65f6\uff0c\u901a\u8fc7audit_buffer_alloc()\u521b\u5efa\u5ba1\u8ba1\u7f13\u51b2\u533a\uff0c\u5e76\u4e14\u5728\u8be5\u7f13\u51b2\u533a\u4e2d\u5199\u5165\u5ba1\u8ba1\u5e8f\u5217\u53f7\u548c\u65f6\u95f4\u6233\u7b49\u4fe1\u606f\uff1b<\/p>\n
\u5f53\u8fdb\u7a0b\u5728\u8be5\u51fd\u6570\u4e2d\u88ab\u963b\u585e\u65f6\uff0c\u5c06\u7531kauditd\u5185\u6838\u7ebf\u7a0b\u5c06\u5176\u5524\u9192\uff1b\u7531\u4e8e\u5f53\u524d\u8fdb\u7a0b\u88ab\u963b\u585e\u7684\u7406\u7531\u662f\u7f13\u51b2\u533a\u672a\u88ab\u53d1\u9001\u7684\u6570\u636e\u8d85\u8fc7\u4e86\u9650\u5236\uff0c\u56e0\u6b64\u4e00\u65e6kauditd\u53d1\u9001\u4e86\u6570\u636e\u540e\uff0c\u8be5\u8fdb\u7a0b\u5c06\u88ab\u5524\u9192\u3002<\/p>\n
1.2.2.audit_log_vformat()<\/strong><\/p>\n
\u5ba1\u8ba1\u6570\u636e\u4e0d\u662f\u4e00\u6b21\u5168\u90e8\u4ea7\u751f\uff0c\u56e0\u6b64audit_log_vformat(\uff09\u53ef\u80fd\u88ab\u8c03\u7528\u591a\u6b21\uff0c\u5728\u9700\u8981\u8bb0\u5f55\u4fe1\u606f\u7684\u5730\u65b9\u8c03\u7528\u8be5\u51fd\u6570\u5373\u53ef\uff1b\u6240\u6709\u7684\u6570\u636e\u5c06\u4ee5\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u7684\u5f62\u5f0f\u8fdb\u884c\u8bb0\u5f55\uff1b<\/p>\n
1.2.3.audit_log_end()<\/strong><\/p>\n
\u8be5\u51fd\u6570\u5c06\u7ed3\u675f\u672c\u6b21\u5ba1\u8ba1\u65e5\u5fd7\u7684\u8bb0\u5f55\u8fc7\u7a0b\uff0c\u5177\u4f53\u7684\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n
1.\u901a\u8fc7audit_rate_check()\u68c0\u67e5\u5f53\u524d\u5ba1\u8ba1\u65e5\u5fd7\u53d1\u9001\u7684\u9891\u7387\u662f\u5426\u8d85\u8fc7\u4e86\u8bbe\u5b9a\u7684\u9650\u5236\uff1b\u5373\u5982\u679c\u6bcf\u79d2\u4ece\u5185\u6838\u5411\u7528\u6237\u6001\u53d1\u9001\u7684\u65e5\u5fd7\u6570\u8d85\u8fc7\u4e86\u5236\u5b9a\u7684\u6570\u503caudit_rate_limit\uff0c\u90a3\u4e48\u5c06\u629b\u5f03\u5f53\u524d\u7684\u65e5\u5fd7\uff1b<\/p>\n
2.\u4ece\u5f53\u524d\u5ba1\u8ba1\u65e5\u5fd7\u7f13\u51b2\u533a\u4e2d\u63d0\u53d6\u6240\u5c01\u88c5\u7684\u5957\u63a5\u5b57\u7f13\u51b2\u533a\uff0c\u5c06\u5176\u52a0\u5165\u5230audit_skb_queue\u94fe\u8868\u4e2d\uff1b<\/p>\n
3..\u5524\u9192kauditd_wait\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4e00\u4e2a\u8fdb\u7a0b\u3002\u8be5\u7b49\u5f85\u961f\u5217\u7531\u5185\u6838\u7ebf\u7a0bkauditd\u63a7\u5236\uff0c\u8be5\u7ebf\u7a0b\u5c06\u4f9d\u6b21\u53d1\u9001audit_skb_queue\u94fe\u8868\u4e2d\u7684\u7f13\u51b2\u533a\uff0c\u5982\u679c\u5df2\u7ecf\u65e0\u8282\u70b9\u53ef\u53d1\uff0c\u5219\u963b\u585e\u5f53\u524d\u7ebf\u7a0b\uff1b\u6b64\u65f6\uff0c\u7531\u4e8e\u521a\u5411audit_skb_queue\u4e2d\u52a0\u5165\u4e86\u65b0\u7684\u8282\u70b9\uff0c\u56e0\u6b64\u5524\u9192kauditd\u7ebf\u7a0b\uff1b<\/p>\n
4.\u91ca\u653e\u5728audit_log_start()\u4e2d\u7533\u8bf7\u7684audit_buffer\u7f13\u51b2\u533a\uff1b<\/p>\n
1.3.\u5ba1\u8ba1\u89c4\u5219\u7684\u64cd\u4f5c<\/h3>\n
audit_receive_msg\u51fd\u6570\u63a5\u6536\u5e76\u5904\u7406\u7528\u6237\u6001auditctl\u547d\u4ee4\u53d1\u9001\u7684\u6d88\u606f\uff0c\u8fd9\u91cc\u9488\u5bf9\u5ba1\u8ba1\u89c4\u5219\u7684\u64cd\u4f5c\u5b9e\u73b0\u505a\u7b80\u5355\u8bf4\u660e\u3002<\/p>\n
\u5ba1\u8ba1\u89c4\u5219\u7684\u64cd\u4f5c\u5305\u62ec\u589e\u52a0\u3001\u5220\u9664\u548c\u5217\u4e3e\u5f53\u524d\u89c4\u5219\uff0c\u8fd9\u4e09\u79cd\u64cd\u4f5c\u7c7b\u578b\u5728\u5185\u6838\u4e2d\u5206\u522b\u5bf9\u5e94\u4e3aAUDIT_ADD_RULE\u3001AUDIT_DEL_RULE\u548cAUDIT_LIST_RULES\u3002\u8fd9\u4e9b\u64cd\u4f5c\u5728audit_receive_msg\u51fd\u6570\u4e2d\u5747\u7531audit_receive_filter\u51fd\u6570\u8fdb\u884c\u5177\u4f53\u5904\u7406\uff0c\u5177\u4f53\u7684\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n
1.\u5bf9\u4e8e\u589e\u52a0\u548c\u5220\u9664\u64cd\u4f5c\uff0c\u5148\u901a\u8fc7audit_log_common_recv_msg()\u9488\u5bf9\u672c\u6b21\u5ba1\u8ba1\u89c4\u5219\u7684\u64cd\u4f5c\u8fdb\u884c\u5ba1\u8ba1\u65e5\u5fd7\u7f13\u51b2\u533a\u7684\u5206\u914d\u548c\u90e8\u5206\u5b57\u6bb5\u7684\u8bb0\u5f55\uff1b<\/p>\n
2.\u5ba1\u8ba1\u89c4\u5219\u5728\u5185\u6838\u4e2d\u901a\u8fc7\u53cc\u94fe\u8868\u8fdb\u884c\u7ec4\u7ec7\uff0c\u56e0\u6b64\u5bf9\u5ba1\u8ba1\u89c4\u5219\u7684\u64cd\u4f5c\u5373\u662f\u5bf9\u94fe\u8868\u7684\u64cd\u4f5c\uff1b<\/p>\n
\u5bf9\u4e8eAUDIT_LIST_RULES\u64cd\u4f5c\uff0caudit_receive_filter\u51fd\u6570\u5373\u5206\u914d\u7f13\u51b2\u533a\uff0c\u4f9d\u6b21\u904d\u5386\u89c4\u5219\u5e76\u62f7\u8d1d\u81f3\u7f13\u51b2\u533a\uff0c\u6700\u7ec8\u901a\u8fc7audit_send_list\u7ebf\u7a0b\u5c06\u7f13\u51b2\u533a\u6570\u636e\u53d1\u9001\u81f3\u5185\u6838\u6001\uff1b\u5177\u4f53\u7684\uff0cnetlink\u4e2d\u4ece\u5185\u6838\u6001\u53d1\u9001\u6570\u636e\u81f3\u7528\u6237\u6001\u901a\u8fc7netlink_unicast(\uff09\u51fd\u6570\u5b8c\u6210\uff1b<\/p>\n
\u5bf9\u4e8eAUDIT_ADD_RULES\u64cd\u4f5c\uff0caudit_receive_filter()\u5148\u901a\u8fc7audit_data_to_entry()\u5c06\u7528\u6237\u6001\u53d1\u9001\u7684\u89c4\u5219data\u8f6c\u6362\u6210\u5185\u6838\u4e2d\u4f7f\u7528\u7684\u89c4\u5219entry\uff0c\u5176\u6b21\u5c06\u5f53\u524d\u7684\u89c4\u5219\u6dfb\u52a0\u5230\u5bf9\u5e94\u7684\u89c4\u5219\u94fe\u8868\u4e2d\uff1b\u7531\u4e8e\u5ba1\u8ba1\u7cfb\u7edf\u7684\u6587\u4ef6\u76d1\u63a7\u57fa\u4e8efsnotify\u673a\u5236\u5b8c\u6210\uff0c\u56e0\u6b64\u8fd8\u9700\u5c06\u89c4\u5219\u4e2d\u5bf9\u5e94\u7684\u6587\u4ef6\u52a0\u5165\u5230fsnotify\u76d1\u63a7\u5217\u8868\u4e2d\uff1b<\/p>\n
AUDIT_DEL_RULES\u64cd\u4f5c\u7684\u5b9e\u73b0\u4e0e\u589e\u52a0\u662f\u76f8\u53cd\u8fc7\u7a0b\uff0c\u5728\u6b21\u4e0d\u518d\u8d58\u8ff0\uff1b<\/p>\n
2.kauditd\u5185\u6838\u7ebf\u7a0b\u7684\u5b9e\u73b0<\/h2>\n
kauditd\u5185\u6838\u7ebf\u7a0b\u5bf9\u5e94\u7684\u6267\u884c\u51fd\u6570\u4e3akauditd_thread()\uff0c\u5b83\u5c06\u5ba1\u8ba1\u5957\u63a5\u5b57\u7f13\u51b2\u533a\u94fe\u8868audit_skb_queue\u4e2d\u7684\u8282\u70b9\u53d1\u9001\u81f3\u7528\u6237\u6001\uff0c\u7528\u6237\u6001auditd\u5c06\u8fd9\u4e9b\u65e5\u5fd7\u5199\u5165\u5ba1\u8ba1\u6587\u4ef6\uff08auditd.log\uff09\u3002\u8be5\u7ebf\u7a0b\u5c06\u5faa\u73af\u53d1\u9001\u7f13\u51b2\u533a\u6570\u636e\uff0c\u5f53\u7f13\u51b2\u533a\u94fe\u8868\u6709\u8282\u70b9\u65f6\u5c31\u5229\u7528netlink\u5957\u63a5\u5b57\u4ece\u5185\u6838\u53d1\u9001\u6570\u636e\u5230\u7528\u6237\u6001\uff0c\u5f53\u8be5\u94fe\u8868\u4e2d\u4e3a\u7a7a\u65f6\uff0c\u8be5\u7ebf\u7a0b\u5c06\u8fdb\u5165\u7b49\u5f85\u72b6\u6001\uff0c\u76f4\u5230\u7f13\u51b2\u533a\u6709\u65b0\u7684\u8282\u70b9\u65f6\u5019\u518d\u88ab\u5524\u9192\u3002kauditd\u6bcf\u6b21\u5177\u4f53\u7684\u6267\u884c\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n
1.\u5f53\u7528\u6237\u6001\u7684auditd\u8fd0\u884c\uff08\u5185\u6838\u4e2daudit_pid\u6807\u5fd7\uff09\uff0c\u4e14\u5ba1\u8ba1\u529f\u80fd\u968f\u542f\u52a8\u5f00\u542f\u65f6\uff08\u5185\u6838\u4e2daudit_default\u6807\u5fd7\uff09\uff0c\u5c06\u4e0d\u65ad\u5c06audit_skb_hold_queue\u94fe\u8868\u4e2d\u7684\u8282\u70b9\u53d1\u9001\u81f3\u7528\u6237\u6001\uff1b\u8be5\u94fe\u8868\u4e2d\u901a\u5e38\u4fdd\u5b58\u7684\u662f\u5f53auditd\u505c\u6b62\u540e\u6216\u542f\u52a8\u524d\u6240\u4ea7\u751f\u7684\u5ba1\u8ba1\u65e5\u5fd7\uff0c\u8fd9\u4e9b\u65e5\u5fd7\u5728auditd\u672a\u6b63\u5e38\u8fd0\u884c\u65f6\u53ef\u80fd\u5df2\u7ecf\u88ab\u53d1\u9001\u81f3\u7cfb\u7edf\u7684syslog\u4e2d\uff0c\u5f53auditd\u6b63\u5e38\u8fd0\u884c\u65f6\u5219\u9700\u8981\u5c06\u5b83\u4eec\u4fdd\u5b58\u5728\u5ba1\u8ba1\u7684\u65e5\u5fd7\u6587\u4ef6\u4e2d\uff1b<\/p>\n
2.\u901a\u8fc7skb_dequeue()\u5728audit_skb_queue\u94fe\u8868\u4e2d\u79fb\u9664\u4e00\u4e2a\u7f13\u51b2\u533a\u8282\u70b9\uff1b<\/p>\n
3.\u5524\u9192audit_backlog_wait\u7b49\u5f85\u94fe\u8868\u4e2d\u7684\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u8868\u793a\u6b64\u65f6\u53ef\u4ee5\u7ee7\u7eed\u751f\u6210\u65e5\u5fd7\u4e86\uff1b<\/p>\n
4.\u5f53\u5728audit_skb_queue\u4e2d\u79fb\u9664\u8282\u70b9\u6210\u529f\u65f6\uff0c\u5c06\u901a\u8fc7kauditd_send_skb()\u53d1\u9001\u6570\u636e\u5230\u7528\u6237\u6001\uff0c\u6216\u8005\uff08\u5f53auditd\u672a\u542f\u52a8\u65f6\uff09\u76f4\u63a5printk\u5230\u7cfb\u7edf\u65e5\u5fd7\u4e2d\uff1b<\/p>\n
5.\u5f53\u5728audit_skb_queue\u4e2d\u79fb\u9664\u8282\u70b9\u5931\u8d25\u65f6\uff0c\u5c06\u521b\u5efa\u4e00\u4e2a\u7b49\u5f85\u5b9e\u4f8b\uff0c\u5c06\u5176\u6dfb\u52a0\u5230kauditd_wait\u7b49\u5f85\u961f\u5217\u4e2d\uff1b\u5982\u679c\u6b64\u65f6audit_skb_queue\u4e2d\u786e\u5b9e\u6ca1\u6709\u8282\u70b9\u4e86\uff0c\u90a3\u4e48\u5c06\u5f53\u524d\u5185\u6838\u7ebf\u7a0b\u72b6\u6001\u7f6e\u4e3aTASK_INTERRUPTIBLE\uff0c\u5e76\u4e14\u4e3b\u52a8\u53d1\u8d77\u91cd\u65b0\u8c03\u5ea6\uff1b\u5426\u5219\uff0c\u91cd\u65b0\u5c06\u5f53\u524d\u8fdb\u7a0b\u72b6\u6001\u6062\u590d\u4e3aTASK_RUNNING\uff0c\u5e76\u4ece\u7b49\u5f85\u961f\u5217\u4e2d\u5c06\u5176\u79fb\u9664\uff1b<\/p>\n
\u5982\u679ckauditd\u7531\u4e8e\u7f13\u51b2\u533a\u94fe\u8868\u4e2d\u65e0\u6570\u636e\u800c\u963b\u585e\u4e86\uff0c\u90a3\u4e48\u4e00\u65e6\u5ba1\u8ba1\u7cfb\u7edf\u53c8\u4ea7\u751f\u4e86\u65b0\u7684\u5957\u63a5\u5b57\u7f13\u51b2\u533a\u65f6\uff0c\u5b83\u5c06\u4f1a\u88ab\u5524\u9192\u3002\u5177\u4f53\u7684\u5524\u9192\u52a8\u4f5c\u5728audit_log_end()\u4e2d\u3002<\/p>\n
3.\u603b\u7ed3<\/h2>\n
\u5ba1\u8ba1\u5185\u6838\u6a21\u5757\u548ckauditd\u5185\u6838\u7ebf\u7a0b\u57fa\u672c\u4f53\u73b0\u4e86\u5ba1\u8ba1\u5728\u5185\u6838\u4e2d\u7684\u5b9e\u73b0\u6846\u67b6\uff0c\u524d\u8005\u8d1f\u8d23\u5904\u7406\u7528\u6237\u6001\u53d1\u9001\u7684\u547d\u4ee4\u8bf7\u6c42\uff0c\u5b8c\u6210\u5ba1\u8ba1\u89c4\u5219\u7684\u64cd\u4f5c\u4efb\u52a1\uff1b\u540e\u8005\u5b8c\u6210\u65e5\u5fd7\u5411\u7528\u6237\u6001\u7684\u5408\u7406\u4f20\u9001\u3002\u5bf9\u4e8e\u5ba1\u8ba1\u7cfb\u7edf\u6765\u8bf4\uff0c\u7528\u6237\u66f4\u5173\u5fc3\u7684\u662f\u65e5\u5fd7\u7684\u4ea7\u751f\u3002\u90a3\u4e48\uff0c\u5ba1\u8ba1\u65e5\u5fd7\u662f\u5728\u5185\u6838\u54ea\u4e2a\u90e8\u5206\u4ea7\u751f\u7684\uff1f\u4ec0\u4e48\u65f6\u673a\u4ea7\u751f\uff1f\u8fd9\u5c06\u6d89\u53ca\u5230\u5ba1\u8ba1\u7cfb\u7edf\u4e2d\u6587\u4ef6\u76d1\u63a7\u548c\u8fdb\u7a0b\u76d1\u63a7\u7684\u5b9e\u73b0\uff0c\u8bf7\u53c2\u8003\u672c\u7cfb\u5217\u4e0b\u4e00\u7bc7\u6587\u7ae0\u3002<\/p>\n
\u53c2\u8003\u8d44\u6599\uff1a<\/strong><\/p>\n
1.Linux Audit \uff1ahttp:\/\/people.redhat.com\/sgrubb\/audit\/<\/p>\n
2.\u6df1\u5165Linux\u5185\u6838\u67b6\u6784\uff1ahttp:\/\/book.douban.com\/subject\/4843567\/<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5ba1\u8ba1\u7cfb\u7edf\u5728\u5185\u6838\u7684\u5b9e\u73b0\u90e8\u5206\u4e3b\u8981\u5305\u62ec\u662f\u5ba1\u8ba1\u5185\u6838\u6a21\u5757\u3001kauditd\u5185\u6838\u7ebf\u7a0b\u3001\u8fdb\u7a0b\u5ba1\u8ba1\u548c\u6587\u4ef6\u7cfb\u7edf\u7684\u5ba1\u8ba1\u3002\u5ba1\u8ba1\u7cfb\u7edf\u7684\u5185 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110],"tags":[409,410,411],"class_list":["post-4562","post","type-post","status-publish","format-standard","hentry","category-linux","tag-audit","tag-410","tag-411"],"views":17703,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4562","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=4562"}],"version-history":[{"count":7,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4562\/revisions"}],"predecessor-version":[{"id":4569,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4562\/revisions\/4569"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=4562"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=4562"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=4562"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}