⭐ 欢迎来到虫虫下载站！ | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站
📤 上传资源

📄 1041.html

📁 著名的linux英雄站点的文档打包
💻 HTML
📖 第 1 页 / 共 5 页
字号:
🔍
12345 
int acc_info(char *info,account *user)  <br>
{  <br>
  char * start = info;  <br>
  char * now = info;  <br>
<br>
  /* username */  <br>
  while (*now&&*now!=':') now++; /* 这是超级大安全漏洞 */  <br>
  if (!*now) return 0;  <br>
  *now = 0; now++;  <br>
  strcpy(user-&gt;username,start); /* 这会导致buffer overflow */  <br>
  start = now;  <br>
  /* passwd */  <br>
  while (*now&&*now!=':') now++; /* 这是超级大安全漏洞 */  <br>
  if (!*now) return 0;  <br>
  *now = 0; now++;  <br>
  strcpy(user-&gt;passwd,start); /* 这会导致buffer overflow */  <br>
  start = now;  <br>
  /* uid */  <br>
  while (*now&&*now!=':') now++;  <br>
  if (!*now) return 0;  <br>
  *now = 0; now++;  <br>
  user-&gt;uid = atoi(start);  <br>
  start = now;  <br>
  /* gid */  <br>
  while (*now&&*now!=':') now++;  <br>
  if (!*now) return 0;  <br>
  *now = 0; now++;  <br>
  user-&gt;gid = atoi(start);  <br>
  start = now;  <br>
  /* name */  <br>
  while (*now&&*now!=':') now++; /* 这是超级大安全漏洞 */  <br>
  if (!*now) return 0;  <br>
  *now = 0; now++;  <br>
  strcpy(user-&gt;name,start); /* 这会导致buffer overflow */  <br>
  start = now;  <br>
  /* root */  <br>
  while (*now&&*now!=':') now++; /* 这是超级大安全漏洞 */  <br>
  if (!*now) return 0;  <br>
  *now = 0; now++;  <br>
  strcpy(user-&gt;root,start); /* 这会导致buffer overflow */  <br>
  start = now;  <br>
  /* shell */  <br>
  while (*now&&*now!=':') now++; /* 这是超级大安全漏洞 */  <br>
  *now = 0; now++;  <br>
  strcpy(user-&gt;shell,start); /* 这会导致buffer overflow */  <br>
  start = now;  <br>
  return 1;  <br>
}  <br>
<br>
int read_password(char *filename,account *users)  <br>
{  <br>
  FILE *fp;  <br>
  char buf[1024];  <br>
  int n;  <br>
<br>
  n = 0;  <br>
  fp = fopen(filename,"rt");  <br>
  while (fgets(buf,1024,fp)!=NULL) {  <br>
    if (acc_info(buf,&users[n])) n++;  <br>
  }  <br>
  fclose(fp);  <br>
  return n;  <br>
}  <br>
<br>
void main(int argc,char **argv)  <br>
{  <br>
  int n,i,done;  <br>
  account ACC[128];  <br>
  char username[256];  <br>
  char password[256];  <br>
  char * passwd;  <br>
  char salt[4];  <br>
<br>
  if (argc&lt;2) {  <br>
    printf("username:");  <br>
    scanf("%s",username); /* 这是超级大安全漏洞 */  <br>
  } else strcpy(username,argv[1]); /* 这是超级大安全漏洞 */  <br>
  if (argc&lt;3) {  <br>
    printf("password:");  <br>
    scanf("%s",password); /* 这是超级大安全漏洞 */  <br>
  } else strcpy(password,argv[2]); /* 这是超级大安全漏洞 */  <br>
<br>
  n = read_password("/etc/passwd",ACC);  <br>
<br>
  for (i=0,done=0;i    if (strcmp(username,ACC[i].username)==0) {  <br>
      salt[0] = ACC[i].passwd[0];  <br>
      salt[1] = ACC[i].passwd[1];  <br>
      salt[2] = 0;  <br>
      passwd = crypt(password,salt);  <br>
      printf("%s %s %s",ACC[i].username,ACC[i].passwd,passwd);  <br>
      if (strcmp(passwd,ACC[i].passwd)==0) {  <br>
        printf("login successfully!");  <br>
      } else {  <br>
        printf("incorrect password!");  <br>
      }  <br>
      done = 1;  <br>
    }  <br>
  if (!done) printf("invalid username!");  <br>
}  <br>
<br>
编译 <br>
gcc -o verify_passwd verify_passwd.c -lcrypt  <br>
检验 <br>
./verify_passwd your_username your_password  <br>
避免安全漏洞 <br>
buffer overflow是个很严重的安全漏洞，通常您不可使用像char buf[xxxx]的宣告。在这一类与安全有相关的任何程式写作中(不是只有密码，例如像www/ftp/telnet的这一类对外窗口都要算在内)，您应该要先检查字串长度。例如以下例子:  <br>
len = strlen(incoming_username);  <br>
if (len&gt;xxx) invalid;  <br>
new_string = (char*)malloc(len+1);  <br>
strcpy(new_string,incoming_username);  <br>
your_own_operations...  <br>
<br>
如此才能避免buffer overflow，万万不可滥做假设，切记切记，连许多数十年经验丰富的老手都会犯这个错误。  <br>
<br>
<br>
<br>
-------------------------------------------------------------------------------- <br>
<br>
与crypt函数相关者尚有以下三个: <br>
void setkey (const char *key);  <br>
void encrypt (char *block, int edflag);  <br>
void swab (const char *from, char *to, ssize_t n);  <br>
一般来说，除非您有特殊需求，你不会用到这三个。  <br>
 <br>
 <br>
Linux程式设计- 9.PAM <br>
http://www.openchess.org/noitatsko/programming/ (2001-05-24 22:08:00) <br>
<br>
<br>
Linux-PAM stands for Pluggable Authentication Modules for Linux。  <br>
PAM是个可外挂式的认模组。其详细文件一般在/usr/doc/pam-XX中，您也可以在metalab.unc.edu/LDP或Red Hat站中找到PAM-HOWTO。  <br>
<br>
我不准备介绍PAM的使用，在此我将精力放在如何运用PAM的函数库上。您在进一步看下去之前，应当先阅读有关PAM的相关资料，并且先解其运作机制，对它先有个初步解，然後再回来继续。  <br>
 <br>
 <br>
Linux程式设计- 10.termios/keymap/terminal programming <br>
http://www.openchess.org/noitatsko/programming/ (2001-05-25 07:00:00) <br>
<br>
<br>
termios <br>
   <br>
   <br>
<br>
int tcgetattr (int fd, struct termios *termios_p);  <br>
int tcsetattr (int fd, int optional_actions,const struct termios *termios_p);  <br>
   <br>
   <br>
   <br>
   <br>
<br>
<br>
<br>
-------------------------------------------------------------------------------- <br>
<br>
keymap <br>
我写了一个小程式来专门处理Linux上的keymap，keymap.h及keymap.c。  <br>
在Linux Terminal上，如果您想要设定某些按键返回特定值，您会需要用到以下这些技巧。  <br>
<br>
设定keymap <br>
#include   <br>
#include   <br>
void setkeymap(void)  <br>
{  <br>
  struct kbentry KEYMAP;  <br>
  KEYMAP.kb_table=STATE;  <br>
  KEYMAP.kb_index=SCANCODE;  <br>
  KEYMAP.kb_value=VALUE;  <br>
  ioctl(console,KDSKBENT,&KEYMAP);  <br>
}  <br>
<br>
STATE为状态键组合  <br>
/usr/include/linux/keyboard.h中  <br>
<br>
#define KG_SHIFT        0  <br>
#define KG_CTRL         2  <br>
#define KG_ALT          3  <br>
#define KG_ALTGR        1  <br>
#define KG_SHIFTL       4  <br>
#define KG_SHIFTR       5  <br>
#define KG_CTRLL        6  <br>
#define KG_CTRLR        7  <br>
#define KG_CAPSSHIFT    8  <br>
<br>
使用方式如:  <br>
#define KST_CTRL        (1&lt;#define KST_ALT         (1&lt;#define KST_SHIFT       (1&lt;#define KST_CTRL_ALT    (KST_CTRL|KST_ALT)  <br>
#define KST_ALT_SHIFT   (KST_ALT|KST_SHIFT)  <br>
<br>
SCANCODE为键盘扫描码  <br>
<br>
#define SCAN_ESC      0x01  <br>
#define SCAN_1        0x02  <br>
#define SCAN_2        0x03  <br>
#define SCAN_3        0x04  <br>
#define SCAN_4        0x05  <br>
#define SCAN_5        0x06  <br>
#define SCAN_6        0x07  <br>
#define SCAN_7        0x08  <br>
#define SCAN_8        0x09  <br>
#define SCAN_9        0x0A  <br>
#define SCAN_0        0x0B  <br>
#define SCAN_MINUS    0x0C  <br>
#define SCAN_PLUS     0x0D  <br>
#define SCAN_BACK     0x0E  <br>
#define SCAN_TAB      0x0F  <br>
#define SCAN_Q        0x10  <br>
#define SCAN_W        0x11  <br>
#define SCAN_E        0x12  <br>
#define SCAN_R        0x13  <br>
#define SCAN_T        0x14  <br>
#define SCAN_Y        0x15  <br>
#define SCAN_U        0x16  <br>
#define SCAN_I        0x17  <br>
#define SCAN_O        0x18  <br>
#define SCAN_P        0x19  <br>
#define SCAN_LTQUOTE  0x1A  <br>
#define SCAN_RTQUOTE  0x1B  <br>
#define SCAN_ENTER    0x1C  <br>
#define SCAN_CTRL     0x1D  <br>
#define SCAN_A        0x1E  <br>
#define SCAN_S        0x1F  <br>
#define SCAN_D        0x20  <br>
#define SCAN_F        0x21  <br>
#define SCAN_G        0x22  <br>
#define SCAN_H        0x23  <br>
#define SCAN_J        0x24  <br>
#define SCAN_K        0x25  <br>
#define SCAN_L        0x26  <br>
#define SCAN_SPLIT    0x27  <br>
#define SCAN_QUOTE    0x28  <br>
#define SCAN_MARK     0x29  <br>
#define SCAN_LSHIFT   0x2A  <br>
#define SCAN_STAND    0x2B  <br>
#define SCAN_Z        0x2C  <br>
#define SCAN_X        0x2D  <br>
#define SCAN_C        0x2E  <br>
#define SCAN_V        0x2F  <br>
#define SCAN_B        0x30  <br>
#define SCAN_N        0x31  <br>
#define SCAN_M        0x32  <br>
#define SCAN_LSQUOTE  0x33  <br>
#define SCAN_RSQUOTE  0x34  <br>
#define SCAN_QUESTION 0x35  <br>
#define SCAN_RSHIFT   0x36  <br>
#define SCAN_PRTSCR   0x37  <br>
#define SCAN_ALT      0x38  <br>
#define SCAN_SPACE    0x39  <br>
#define SCAN_CAPSLOCK 0x3A  <br>
#define SCAN_F1       0x3B  <br>
#define SCAN_F2       0x3C  <br>
#define SCAN_F3       0x3D  <br>
#define SCAN_F4       0x3E  <br>
#define SCAN_F5       0x3F  <br>
#define SCAN_F6       0x40  <br>
#define SCAN_F7       0x41  <br>
#define SCAN_F8       0x42  <br>
#define SCAN_F9       0x43  <br>
#define SCAN_F10      0x44  <br>
#define SCAN_NUMLOCK  0x45  <br>
<br>
#define SCAN_HOME     0x47  <br>
#define SCAN_UP       0x48  <br>
#define SCAN_PGUP     0x49  <br>
#define SCAN_LEFT     0x4B  <br>
<br>
#define SCAN_RIGHT    0x4D  <br>
<br>
#define SCAN_END      0x4F  <br>
#define SCAN_DOWN     0x50  <br>
#define SCAN_PGDN     0x51  <br>
#define SCAN_INSERT   0x52  <br>
#define SCAN_DELETE   0x53  <br>
#define SCAN_F11      0x85  <br>
#define SCAN_F12      0x86  <br>
<br>
/usr/include/linux/kd.h中  <br>
<br>
struct kbentry {  <br>
        unsigned char kb_table;  <br>
        unsigned char kb_index;  <br>
        unsigned short kb_value;  <br>
};  <br>
<br>
#define KDGKBENT        0x4B46  /* gets one entry in translation table */  <br>
#define KDSKBENT        0x4B47  /* sets one entry in translation table */  <br>
<br>
而console为  <br>
console = open("/dev/console",O_RDWR);  <br>
<br>
读取按键 <br>
read(console,&c,sizeof(char));  <br>
<br>
-------------------------------------------------------------------------------- <br>
<br>
terminal programming <br>
term.h/term.c是我写来专门处理一些小型的互动界面程式。  <br>
   <br>
   <br>
   <br>
   <br>
Terminal指令集 <br>
设定颜色 : </FONT><br>
                                      </TD>
                                    </TR>
                                <TR>
                                <TD colSpan=2><FONT 
                                class=middlefont></FONT><BR>
                                        <FONT 
                                class=normalfont>全文结束</FONT> </TD>
                                    </TR>
                                <TR>
                                <TD background="images/dot.gif" tppabs="http://www.linuxhero.com/docs/images/dot.gif" colSpan=2 
                                height=10></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></DIV></TD>
                        <TD vAlign=top width="20%" 
                      background="images/line.gif" tppabs="http://www.linuxhero.com/docs/images/line.gif" rowSpan=2> 
                          <DIV align=center> 
                            <table class=tableoutline cellspacing=1 cellpadding=4 
                        width="100%" align=center border=0>
                              <tr class=firstalt> 
                                <td noWrap background="images/bgline.gif" tppabs="http://www.linuxhero.com/docs/images/bgline.gif" colspan=2 height=21>
                                <font class=normalfont><b>所有分类</b></font></td>
                              </tr>
<tr class=secondalt> <td noWrap width=27%> <font class=normalfont>1:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type1.html" tppabs="http://www.linuxhero.com/docs/type1.html">非技术类</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>2:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type2.html" tppabs="http://www.linuxhero.com/docs/type2.html">基础知识</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>3:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type3.html" tppabs="http://www.linuxhero.com/docs/type3.html">指令大全</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>4:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type4.html" tppabs="http://www.linuxhero.com/docs/type4.html">shell</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>5:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type5.html" tppabs="http://www.linuxhero.com/docs/type5.html">安装启动</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>6:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type6.html" tppabs="http://www.linuxhero.com/docs/type6.html">xwindow</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>7:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type7.html" tppabs="http://www.linuxhero.com/docs/type7.html">kde</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>8:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type8.html" tppabs="http://www.linuxhero.com/docs/type8.html">gnome</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>9:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type9.html" tppabs="http://www.linuxhero.com/docs/type9.html">输入法类</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>10:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type10.html" tppabs="http://www.linuxhero.com/docs/type10.html">美化汉化</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>11:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type11.html" tppabs="http://www.linuxhero.com/docs/type11.html">网络配置</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>12:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type12.html" tppabs="http://www.linuxhero.com/docs/type12.html">存储备份</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>13:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type13.html" tppabs="http://www.linuxhero.com/docs/type13.html">杂项工具</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>14:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type14.html" tppabs="http://www.linuxhero.com/docs/type14.html">编程技术</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>15:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type15.html" tppabs="http://www.linuxhero.com/docs/type15.html">网络安全</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>16:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type16.html" tppabs="http://www.linuxhero.com/docs/type16.html">内核技术</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>17:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type17.html" tppabs="http://www.linuxhero.com/docs/type17.html">速度优化</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>18:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type18.html" tppabs="http://www.linuxhero.com/docs/type18.html">apache</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>19:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type19.html" tppabs="http://www.linuxhero.com/docs/type19.html">email</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>20:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type20.html" tppabs="http://www.linuxhero.com/docs/type20.html">ftp服务</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>21:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type21.html" tppabs="http://www.linuxhero.com/docs/type21.html">cvs服务</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>22:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type22.html" tppabs="http://www.linuxhero.com/docs/type22.html">代理服务</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>23:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type23.html" tppabs="http://www.linuxhero.com/docs/type23.html">samba</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>24:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type24.html" tppabs="http://www.linuxhero.com/docs/type24.html">域名服务</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>25:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type25.html" tppabs="http://www.linuxhero.com/docs/type25.html">网络过滤</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>26:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type26.html" tppabs="http://www.linuxhero.com/docs/type26.html">其他服务</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>27:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type27.html" tppabs="http://www.linuxhero.com/docs/type27.html">nfs</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>28:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type28.html" tppabs="http://www.linuxhero.com/docs/type28.html">oracle</a></font></td>    </tr>  </table></td></tr><tr class=secondalt> <td noWrap width=27%> <font class=normalfont>29:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type29.html" tppabs="http://www.linuxhero.com/docs/type29.html">dhcp</a></font></td>    </tr>  </table></td></tr><tr class=firstalt> <td noWrap width=27%> <font class=normalfont>30:</font> </td><td noWrap width=73%>   <table width=100% border=0>    <tr>       <td><font class=normalfont><a href="type30.html" tppabs="http://www.linuxhero.com/docs/type30.html">mysql</a></font></td>    </tr>
12345

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -