Other NASA hacked, bank hackee

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/* Welcome freedom fighter. The liberation front has gained access to the

* source code for a wire transfer program used by FIRST NATIONAL CYBER, a

* bank used by the alliance for oppression and we need you to find a

* vulnerability in this program and stea... er liberate the funds from an

* operative named prince_john.

*

* The bank programmers have attempted to put in a number of defense checks

* to prevent abuse of the bank wire network, but we suspect that deadlines

* and corporate training programs have left them without the motivation

* required to think of every possibility.

*

* It is imperative that you find a way to drain the account completely

* otherwise they may be able to withdraw the remaining funds and go

* underground before we can finish tracking them in the physical world.

*

* Good luck and as always, should you be detected your actions will be

* blamed on the Chinese Government.

*

* ~~~0xDEADFEED~~~

*

* To build and run the wire transfer program:

*

* $ cc -o wire_transfer wire_transfer.c

* $ ./wire_transfer

*

*/

 

#include <stdbool.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

 

#define MAXLEN 255

 

typedef struct Account {

int balance;

char owner[MAXLEN];

} Account;

 

Account *init_account(const char *name, int balance);

bool wiretransfer(Account *source, Account *dest, int amount);

void display_balance(Account *account);

void exit_if(bool condition, const char *message);

void validate_heist(Account *target);

 

int main(int argc, const char *argv[])

{

unsigned int transfer_amount;

char input[MAXLEN];

 

printf("----- WELCOME TO FIRST CYBER BANK -----\n");

printf("username: robin_hood\n");

printf("password: *****************\n");

printf("Logged In Successfully!\n");

printf("account> wiretransfer prince_john\n");

printf("----- BEGIN WIRE TRANSFER SETUP -----\n");

 

Account *yours = init_account("robin_hood", 10000);

Account *theirs = init_account("prince_john", 500000);

 

display_balance(yours);

display_balance(theirs);

 

while (true) {

printf("Amount to transfer from your account to theirs: ");

fgets(input, sizeof(input), stdin);

transfer_amount = strtoul(input, NULL, 10);

 

if ((long)transfer_amount > 0) {

break;

}

 

printf("Invalid transfer amount!\n");

}

 

printf("----- ATTEMPTING WIRE TRANSFER -----\n");

printf("Wire transfer status: ");

printf("%s\n", wiretransfer(yours, theirs, transfer_amount) ? "SUCCESS" : "FAILURE");

 

display_balance(yours);

display_balance(theirs);

validate_heist(theirs);

 

free(yours);

free(theirs);

 

return 0;

}

 

Account *init_account(const char *name, int balance)

{

Account *account = malloc(sizeof(Account));

exit_if(account == NULL, "Problem allocating memory");

 

if (account != NULL) {

strncpy(account->owner, name, sizeof(account->owner) - 1);

account->balance = balance;

}

 

return account;

}

 

bool wiretransfer(Account *source, Account *dest, int amount)

{

if (source == NULL || dest == NULL) return false;

if (source->balance - amount < 0) return false;

if (dest->balance + amount < 0) return false;

 

source->balance -= amount;

dest->balance += amount;

return true;

}

 

void display_balance(Account *account)

{

if (account == NULL) return;

printf("%s has $%d in their account.\n", account->owner, account->balance);

}

 

void exit_if(bool condition, const char *message)

{

if (condition) {

perror(message);

exit(EXIT_FAILURE);

}

}

 

void validate_heist(Account *target)

{

if (target->balance == 0) {

printf("Target funds liberated: You win \n");

} else {

printf("Target still has operating funds, try again.\n");

}

}

[STRINGCEIL 631 27 9.3.3]

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