我编写了一个程序,旨在通过搜索两个文本文件中存在的匹配哈希来恢复Linux系统密码
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define MAXCHAR 1000
//Declaring Functions to match word in file
int matchfile(char *shadowfilename, char*hashtablefilename);
//shadowfilename for shadow.txt hashtablefilename for hash table
void UsageInfo(char *shadowfile, char * hashtablefile );
//Display usage info on arguements for program
void UsageInfo(char *shadowfile, char * hashtablefile) {
printf("Usage: %s %s <shadowfile> <hashtable>\n", shadowfile,hashtablefile);
}
//main function.
int main(int argc, char *argv[]) {
int result, errcode;
//Display format for user to enter arguements and
//End program if user does not enter exactly 3 arguements
if(argc < 3 || argc > 3) {
UsageInfo(argv[1],argv[2]);
exit(1);
}
system("cls");
//Pass command line arguements into searchstringinfile
result = matchfile(argv[1], argv[2]);
//Display error message
if(result == -1) {
perror("Error");
printf("Error number = %d\n", errcode);
exit(1);
}
return(0);
}
//Declaring Functions to match word in file
//int matchfile(char *shadowfilename, char *hashtablefilename);
//shadowfilename for shadow.txt hashtablefilename for hash table
int matchfile(char *shadowfilename, char *hashtablefilename){
FILE *shadowfile;
FILE *hashtable;
char strshadow[MAXCHAR];
char strhash[MAXCHAR];
shadowfile = fopen(shadowfilename, "r");
if (shadowfile == NULL){
printf("Could not open file %s",shadowfilename);
return 1;
}
hashtable = fopen(hashtablefilename, "r");
if (hashtable == NULL){
printf("Could not open file %s",hashtablefilename);
return 1;
}
//Getting text from the 2 files
while (fgets(strshadow, MAXCHAR, shadowfile) != NULL &&fgets(strhash,MAXCHAR,
hashtable) != NULL){
printf("%s", strshadow);
printf("%s", strhash);
int linenumber = 1;
int search_result = 0;
//Matching words line-by-line
if((strstr(strshadow,strhash)) != NULL) {
//Display line in which matched word is found
printf("A match found on line: %d\n", linenumber);
printf("\n%s\n", strhash);
search_result++;
}
linenumber++;
}
fclose(shadowfile);
return 0;
}
但是,由于前面的字符,我无法匹配两个文件中存在的两个哈希值。
hashtable.txt。此文件包含纯文本中缺少的密码,并且是相应的哈希值。格式如下:(密码):(哈希)
banana:$1$$Tnq7a6/C1wwyKyt0V/.BP/:17482:0:99999:7:::
shadow.txt。此文件包含纯文本帐户用户名,并且是相应的哈希值。格式如下:(用户):(哈希)
pyc1:$1$$Tnq7a6/C1wwyKyt0V/.BP/:17482:0:99999:7:::
如上所示,单词'banana'和'pyc1'阻止程序检测到两个哈希值被检测到。有人能告诉我为克服这个需要做出的改变吗?谢谢。编辑:说明shadow.txt和hashtable.txt的格式
在满足某些条件之前跳过字符串中字符的最简单方法是:
char someString[MAXCHAR];
for (char* ptr = someString; *ptr != '\0'; ptr++) {
if (conditionIsMet(ptr)) {
doSomething();
break;
}
}
在你的情况下,conditionIsMet(ptr)
应该将*ptr
与':'
进行比较,在这种情况下,密码哈希值在(ptr + 1)
下(字符串从下一个字符开始)。我想你可以自己编写其余的代码。