Miniftp 项目学习笔记（五）用户登录的验证

Dear 丶 2021-10-14 00:54 421阅读 0赞

用客户端登录服务器：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70][]

连接一下我们暂时实现的miniftpd，看看效果：

首先，启动miniftpd：./miniftpd

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 1][]

连接miniftpd：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 2][]

接下来实现它，与协议相关的模块都是在ftpproto.c中完成的，目前的代码如下：

#include"ftpproto.h"
    #include"sysutil.h"
    #include "str.h"
    
    void handle_child(session_t *sess)
    {
    	writen(sess->ctrl_fd, "220 (miniftp 0.1)\r\n", strlen("220 (miniftp 0.1)\r\n"));
    	int ret;
    	while(1)
    	{
    		memset(sess->cmdline, 0, sizeof(sess->cmdline));
    		memset(sess->cmd, 0, sizeof(sess->cmd));
    		memset(sess->arg, 0, sizeof(sess->arg));
    
    		ret = readline(sess->ctrl_fd, sess->cmdline, MAX_COMMAND_LINE);
    		if (ret == -1)
    		{
    			ERR_EXIT("readline");
    		}	
    		else if (ret == 0)
    			exit(EXIT_SUCCESS);
    
    			
    		printf("cmdline=[%s]\n", sess->cmdline);
    		//去除/r/n
    		str_trim_crlf(sess->cmdline);
    		printf("cmdline=[%s]\n", sess->cmdline);
    		//解析FTP命令与参数
    		str_split(sess->cmdline, sess->cmd, sess->arg, ' ');
    		printf("cmd=[%s] arg=[%s]\n", sess->cmd, sess->arg);
    		//将命令转换成大写
    		str_upper(sess->cmd);
    		//处理FTP命令
    	}
    }

在上面的模块中，连接miniftpd后，进行的相关操作为：

1、打印出第一条响应：220 (miniftp 0.1)

2、不断读取命令行参数

3、去除去除/r/n

4、解析FTP命令与参数

5、将命令转换成大写

6、处理FTP命令

接下来，我们来处理FTP命令，主要实现do\_user和do\_pass函数：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 3][]

由于这两个函数只用于ftpproto模块，因此，我们将其声明为static：

#include "ftpproto.h"
    #include "sysutil.h"
    #include "str.h"
    
    static void do_user(session_t *sess);
    static void do_pass(session_t *sess);
    
    void handle_child(session_t *sess)
    {
        writen(sess->ctrl_fd, "220 (miniftpd 0.1)\r\n", strlen("220 (miniftpd 0.1)\r\n"));
        int ret;
        while (1)
        {
            memset(sess->cmdline, 0, sizeof(sess->cmdline));
            memset(sess->cmd, 0, sizeof(sess->cmd));
            memset(sess->arg, 0, sizeof(sess->arg));
            ret = readline(sess->ctrl_fd, sess->cmdline, MAX_COMMAND_LINE);
            if (ret == -1)
                ERR_EXIT("readline");
            else if (ret == 0)
                exit(EXIT_SUCCESS);
    
            printf("cmdline=[%s]\n", sess->cmdline);
            // 去除\r\n
            str_trim_crlf(sess->cmdline);
            printf("cmdline=[%s]\n", sess->cmdline);
            // 解析FTP命令与参数
            str_split(sess->cmdline, sess->cmd, sess->arg, ' ');
            printf("cmd=[%s] arg=[%s]\n", sess->cmd, sess->arg);
            // 将命令转换为大写
            str_upper(sess->cmd);
            // 处理FTP命令
            if (strcmp("USER", sess->cmd) == 0)
            {
                do_user(sess);
            }
            else if (strcmp("PASS", sess->cmd) == 0)
            {
                do_pass(sess);
            }
        }
    }
    
    static void do_user(session_t *sess)
    {
        //USER naruto
    }
    
    static void do_pass(session_t *sess)
    {
        // PASS naruto
    }

对于这两个函数，则参照vsftpd的来实现：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 4][]

我们则在do\_user函数中实现：

static void do_user(session_t *sess)
    {
        //USER naruto
        writen(sess->ctrl_fd, "331 Please specify the password.\r\n", strlen("331 Please specify the password.\r\n"));
    }

运行一下miniftpd，看一下效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 5][]

接下来处理do\_pass函数，看一下FTP服务器如何处理：

![20190817095938589.png][]

回复230登陆成功响应

则我们在do\_pass函数中实现：

static void do_pass(session_t *sess)
    {
        // PASS naruto
        writen(sess->ctrl_fd, "230 Login successful.\r\n", strlen("230 Login successful.\r\n"));
    }

编译运行，看看效果：

![20190817100218820.png][]

在此之前，我们并未真正去验证密码，接下来我们去实现。

现在看一下FTP服务器密码错误作出的响应：

![20190817100709678.png][]

密码错误，发出连接失败响应，而用户名错误，则会发出上面同样的响应。

接下来，我们具体来实现登录的验证过程。

首先校验用户名，得根据用户名来获取系统相关信息，可以通过如下函数获取：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 6][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 7][]

通过这个函数就可以判断用户存不存在，具体判断如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 8][]

上面代码不够简洁，我们可以尝试封装一个函数，给出代码和文本，让他自己构造响应的字符串，如上面的：530 Login incorrect.\\r\\n

#include "ftpproto.h"
    #include "sysutil.h"
    #include "str.h"
    
    static void ftp_reply(session_t *sess, int status, const char *text);//内部使用
    static void do_user(session_t *sess);
    static void do_pass(session_t *sess);
    
    void handle_child(session_t *sess)
    {
        writen(sess->ctrl_fd, "220 (miniftpd 0.1)\r\n", strlen("220 (miniftpd 0.1)\r\n"));
        int ret;
        while (1)
        {
            memset(sess->cmdline, 0, sizeof(sess->cmdline));
            memset(sess->cmd, 0, sizeof(sess->cmd));
            memset(sess->arg, 0, sizeof(sess->arg));
            ret = readline(sess->ctrl_fd, sess->cmdline, MAX_COMMAND_LINE);
            if (ret == -1)
                ERR_EXIT("readline");
            else if (ret == 0)
                exit(EXIT_SUCCESS);
    
            printf("cmdline=[%s]\n", sess->cmdline);
            // 去除\r\n
            str_trim_crlf(sess->cmdline);
            printf("cmdline=[%s]\n", sess->cmdline);
            // 解析FTP命令与参数
            str_split(sess->cmdline, sess->cmd, sess->arg, ' ');
            printf("cmd=[%s] arg=[%s]\n", sess->cmd, sess->arg);
            // 将命令转换为大写
            str_upper(sess->cmd);
            // 处理FTP命令
            if (strcmp("USER", sess->cmd) == 0)
            {
                do_user(sess);
            }
            else if (strcmp("PASS", sess->cmd) == 0)
            {
                do_pass(sess);
            }
        }
    }
    
    static void do_user(session_t *sess)
    {
        //USER naruto
        struct passwd *pw = getpwnam(sess->arg);
        if (pw == NULL)
        {
            // 用户不存在
            writen(sess->ctrl_fd, "530 Login incorrect.\r\n", strlen("530 Login incorrect.\r\n"));
            return;
        }
        writen(sess->ctrl_fd, "331 Please specify the password.\r\n", strlen("331 Please specify the password.\r\n"));
    }
    
    static void do_pass(session_t *sess)
    {
        // PASS naruto
        writen(sess->ctrl_fd, "230 Login successful.\r\n", strlen("230 Login successful.\r\n"));
    }
    
    static void ftp_reply(session_t *sess, int status, const char *text)
    {
        
    }

具体实现代码如下：

static void ftp_reply(session_t *sess, int status, const char *text)
    {
        char buf[1024] = {0};
        sprintf(buf, "%d %s\r\n", status, text);
        writen(sess->ctrl_fd, buf, strlen(buf));
    }

这个函数实现后，替换之前的部分代码：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 9][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 10][]

相应的ftp响应代码还有很多，我们定义一个头文件ftpcodes.h，将相应的响应放在这里面：

ftpcodes.h:

#ifndef _FTP_CODES_H_
    #define _FTP_CODES_H_
    
    
    #define FTP_DATACONN          150
    
    #define FTP_NOOPOK            200
    #define FTP_TYPEOK            200
    #define FTP_PORTOK            200
    #define FTP_EPRTOK            200
    #define FTP_UMASKOK           200
    #define FTP_CHMODOK           200
    #define FTP_EPSVALLOK         200
    #define FTP_STRUOK            200
    #define FTP_MODEOK            200
    #define FTP_PBSZOK            200
    #define FTP_PROTOK            200
    #define FTP_OPTSOK            200
    #define FTP_ALLOOK            202
    #define FTP_FEAT              211
    #define FTP_STATOK            211
    #define FTP_SIZEOK            213
    #define FTP_MDTMOK            213
    #define FTP_STATFILE_OK       213
    #define FTP_SITEHELP          214
    #define FTP_HELP              214
    #define FTP_SYSTOK            215
    #define FTP_GREET             220
    #define FTP_GOODBYE           221
    #define FTP_ABOR_NOCONN       225
    #define FTP_TRANSFEROK        226
    #define FTP_ABOROK            226
    #define FTP_PASVOK            227
    #define FTP_EPSVOK            229
    #define FTP_LOGINOK           230
    #define FTP_AUTHOK            234
    #define FTP_CWDOK             250
    #define FTP_RMDIROK           250
    #define FTP_DELEOK            250
    #define FTP_RENAMEOK          250
    #define FTP_PWDOK             257
    #define FTP_MKDIROK           257
    
    #define FTP_GIVEPWORD         331
    #define FTP_RESTOK            350
    #define FTP_RNFROK            350
    
    #define FTP_IDLE_TIMEOUT      421
    #define FTP_DATA_TIMEOUT      421
    #define FTP_TOO_MANY_USERS    421
    #define FTP_IP_LIMIT          421
    #define FTP_IP_DENY           421
    #define FTP_TLS_FAIL          421
    #define FTP_BADSENDCONN       425
    #define FTP_BADSENDNET        426
    #define FTP_BADSENDFILE       451
    
    #define FTP_BADCMD            500
    #define FTP_BADOPTS           501
    #define FTP_COMMANDNOTIMPL    502
    #define FTP_NEEDUSER          503
    #define FTP_NEEDRNFR          503
    #define FTP_BADPBSZ           503
    #define FTP_BADPROT           503
    #define FTP_BADSTRU           504
    #define FTP_BADMODE           504
    #define FTP_BADAUTH           504
    #define FTP_NOSUCHPROT        504
    #define FTP_NEEDENCRYPT       522
    #define FTP_EPSVBAD           522
    #define FTP_DATATLSBAD        522
    #define FTP_LOGINERR          530
    #define FTP_NOHANDLEPROT      536
    #define FTP_FILEFAIL          550
    #define FTP_NOPERM            550
    #define FTP_UPLOADFAIL        553
    
    
    #endif /* _FTP_CODES_H_ */

然后在ftpproto.c源文件中包含该头文件：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 11][]

现在，将ftproto.c中相应的状态值用ftpcodes.h头文件中对应的宏替换，这样代码看起来更加简洁，明了：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 12][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 13][]

重新编译，运行，看下效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 14][]![20190817110154865.png][]

暂时还未进行验证，接下来继续实现用户名和密码的验证功能。

将passwd中的user ID字段保存到session结构体中，便于验证密码时使用：

session.h:

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 15][]

修改对session的初始化：

miniftp.c：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 16][]

用户名验证成功之后，将值保存在session中：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 17][]

接下来对密码进行验证，在验证密码之前，再对用户名验证一次：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 18][]

接下来验证密码，要使用影子文件信息， 要使用getspnam函数，其能根据用户名获取影子文件信息：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 19][]

name参数为传递的用户名。

接下来获取影子文件，sp为空，则直接返回：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 20][]

接下来比较客户端传过来的用户密码跟影子文件中的密码（密码验证）：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 21][]

FTP客户端发过来的密码是可见的，所以在比较之前首先需要对密码进行加密，这里需要用到另外一个系统函数：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 22][]

将加密过的密码作为种子。

添加代码如下：

ftpproto.c：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 23][]

接下来验证密码，代码如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 24][]

编译运行，看一下效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 25][]

我们未包含getspnam函数和crypt函数的头文件，man一下，看看少了什么头文件：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 26][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 27][]

将其加到common.h中去：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 28][]

再编译一下，看看有没有错：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 29][]

再man一下crypt函数，看看：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 30][]

链接时要加上-lcrypt后缀，修改一下Makefile文件：  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 31][]

再编译试试：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 32][]

运行，连接看看FTP响应：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 33][]

![20190817215634328.png][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70]: /images/20211013/ac579936e91d4a4c8ee01650a8b60998.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 1]: /images/20211013/3235f7daf7c2435692fbc0aba500b900.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 2]: /images/20211013/2043d7172910482489201b19eac2665a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 3]: /images/20211013/fdf09a0d4e1e4d808ba8ae077a6703e1.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 4]: /images/20211013/34977706f7c744098f2f7eda5310aa57.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70 5]: /images/20211013/115da1bdf1fd427aa41eafaebd1f99ac.png
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