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wallet.c
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wallet.c
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#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#define MAX_LENGTH 10
float balance;
char *inputString(size_t *size){
char *str;
unsigned base = 32;
int ch;
size_t len = 0;
str = realloc(NULL, sizeof(char)*base);
if(!str)return str;
while('\n'!=(ch=fgetc(stdin))){
str[len++]=ch;
if(len==base){
str = realloc(str, sizeof(char)*(base+=16));
if(!str)return str;
}
}
str[len++]='\0';
*size = len;
return realloc(str, sizeof(char)*len);
}
int strcmp(const char* str1, const char* str2) {
int i = 0;
while (str1[i] != '\0' && str2[i] != '\0') {
if (str1[i] != str2[i]) return 1;
i++;
}
if (str1[i] == str2[i] && str1[i] == '\0') return 0;
return 1;
}
void strcopy(char *dest, char *src) {
unsigned int i = 0;
while (src[i] != '\0') {
dest[i] = src[i];
i++;
}
}
short authenticate(char *login, char *password) {
int isAuth = 0;
int isAdmin = 0;
char userPassword[MAX_LENGTH]; //overflowable
char data[2][MAX_LENGTH]; //contains the "view" from stash
int charIndex = 0;
short nameOrPassword = 0; // 0 for name, 1 for password
FILE* in = fopen("stash", "r");
char ch;
while ((ch = fgetc(in)) != EOF) {
if (ch == '\n') {
data[1][charIndex] = '\0';
if (strcmp(login, data[0]) == 0) {
break;
}
charIndex = 0;
nameOrPassword = 0;
isAdmin = 0;
}
else if (ch == ';') {
isAdmin = fgetc(in) - '0';
}
else if (ch == ':') {
data[0][charIndex+1] = '\0';
charIndex = 0;
nameOrPassword = 1;
}
else {
if (charIndex < MAX_LENGTH-2) { //overflow from text loading is not possible, I hope
data[nameOrPassword][charIndex] = ch;
data[nameOrPassword][charIndex+1] = '\0';
charIndex++;
}
}
}
fclose(in);
strcopy(userPassword, password); // Here we can overflow the userPassword buffer into isAdmin
if (strcmp(userPassword, data[1]) == 0) {
isAuth = 1;
}
if (isAdmin) return 2; // admin login
if (isAuth) return 1; // normal login
return 0; // login not successful
}
int menu(char** list, int len) {
system("clear");
printf("Choose an option:\n");
for (int i = 0; i < len; i++) {
printf("%d .. %s\n", i, list[i]);
}
printf("%d .. Exit\n", len);
int out = -1;
while (out > len || out < 0) {
scanf("%d", &out);
}
getchar(); // to clear the stdin buffer
return out;
}
void loadBalance() { // Initiate global value
FILE* in = fopen("surelyJsonFromServerAndNotLocallyStoredFile.exe.jpeg.png.piesek", "r");
fscanf(in, "%f", &balance);
fclose(in);
}
void persistBalance() { // Store global value into a file
FILE* out = fopen("surelyJsonFromServerAndNotLocallyStoredFile.exe.jpeg.png.piesek", "w");
fprintf(out, "%.2f", balance);
fclose(out);
}
void printBalance() {
system("clear");
printf("Your balance is: $%.2f\nPress enter to continue.\n", balance);
getchar();
}
void adminMenu() {
system("clear");
loadBalance();
short exit = 0;
char* options[4] = {"Give myself $99999", "Pay", "Check balance", "Admin tools"};
do {
switch(menu(options, 4)) {
case 0: //Give myself $99999
balance += 99999;
break;
case 1: //Pay
//TODO (something like pay(), maybe exploitable)
break;
case 2: //Check balance
printBalance();
break;
case 3: //Admin tools
//TODO add more options, adjust
break;
default: //Exit
exit = 1;
break;
}
} while (!exit);
persistBalance(); //saves the current amount of money
}
void userMenu() {
system("clear");
loadBalance();
short exit = 0;
char* options[2] = {"Pay", "Check balance"};
do {
switch(menu(options, 2)) {
case 0: //Pay
//TODO (again, like in adminMenu())
break;
case 1: //Check balance
printBalance();
break;
default: //Exit
exit = 1;
break;
}
} while (!exit);
persistBalance();
}
int main() {
system("clear");
printf("CRYPTOWALLET TM\n\n");
size_t loglen = 0;
printf("Login as: ");
char* bufferlog = inputString(&loglen);
size_t passlen = 0;
printf("\nPassword: ");
char* bufferpass = inputString(&passlen);
int ans = authenticate(bufferlog, bufferpass);
switch(ans) {
case 1:
userMenu();
break;
case 2:
adminMenu();
break;
default:
printf("\nLOGIN FAILED!\n");
break;
}
free(bufferlog);
free(bufferpass);
return 0;
}