Test password against /etc/passwd

[Jaguar]

Refer to FAQ some part of it didn't compile

//Test a plain text password against an /etc/passwd entry
#include <sys/types.h>
#include <pwd.h>
#include <unistd.h>

int main()
{
  struct passwd *p;
  p=getpwnam(getlogin());
  if (p)
    if (strcmp((char*)crypt("password",p->pw_passwd),p->pw_passwd)==0)
      puts("match");
    else
      puts("not match");
  return 0;
}

$ gcc source.c
/tmp/ccmmZota.o: In function `main':
/tmp/ccmmZota.o(.text+0x42): undefined reference to `crypt'
collect2: ld returned 1 exit status

comment: I modified some part i.e. I cast crypt() to (char *), else more error would be generated.

[Jaguar]

Deeply thanks, vVv

[Woodoo]

Yes, it compiles on my machine. But the result is never ``match'', even if I put correct password. Could any one help me out? The code seems OK.

[cgoat]

I think you may need to read the encrypted password from /etc/shadow, using getspent(). Although you have to be super-user to access the shadow file.