void write_pw(int entry, int value, struct pwdb_passwd *p)
{
if (entry == PW_FAILED) {
p->pw_failed = value;
} else if (entry == PW_AGE) {
p->pw_age = value;
} else {
printf("Faulty entry passed");
return;
}
switch (entry) {
case PW_FAILED:
p->pw_failed = value;
break;
case PW_AGE:
p->pw_age = value;
break;
default:
printf("Erroneous entry passed to write_pw.");
return;
}
if (pwdb_update_user(p) != 0) {
printf("pwdb_update_user returned error %s\n",
pwdb_err2str(pwdb_errno));
}
}
int read_userpwd(char *username){
struct pwdb_passwd *pw_entry;
pw_entry = pwdb_getpwnam(username);
char *password;
char salt[2];
strncpy(salt, pw_entry->pw_passwd, 2);
password = getpass("password: "******"user name could not be found.\n");
}else if(pwdb_errno==PWDB_FILEERR){
printf("could not access the file.\n");}
else if(pwdb_errno==PWDB_MEMERR){
printf("could not allocate memory for the struct pwdb_passwd.\n");}
else if(pwdb_errno==PWDB_ENTRERR){
printf("line in PWFILENAME somehow has invalid format.\n");
}return(0);
}else{*/
if(strcmp(crypt(password, salt), pw_entry-> pw_passwd)==0){
printf("User authenticated successfully. \n");
pw_entry->pw_failed = 0;
pw_entry->pw_age++;
pwdb_update_user(pw_entry);
if(pw_entry->pw_age>=10){
printf("WOOPS, time to change PW. \n");
}
return(1);
}else{
if(pw_entry->pw_failed>=5){
printf("User locked. \n");
}
pw_entry->pw_failed++;
pwdb_update_user(pw_entry);
printf("Unknown user or incorrect password. \n");
read_username(username);
return(0);
}
}
void reset_password(struct pwdb_passwd *p){
// Unnecessary? Not sure about lab instructions.
char password[PASSWORD_SIZE];
char confirm[PASSWORD_SIZE];
while (1){
read_password(password);
read_password(confirm);
if (strcmp(password, confirm) == 0) break;
}
char *crypted = crypt(password, p->pw_passwd);
p->pw_passwd=crypted;
pwdb_update_user(p);
}
void login_failed(struct pwdb_passwd *p){
p->pw_failed++;
if (p->pw_failed >= MAX_FAILED_LOGINS) p->pw_failed = -1;
pwdb_update_user(p);
}
void login_success(struct pwdb_passwd *p){
p->pw_failed = 0;
p->pw_age++;
if (p->pw_age >= MUST_RESET_PASSWORD) reset_password(p);
else pwdb_update_user(p);
}
int main(int argc,char **argv)
{
char *username;
char *buf;
size_t buflen, chread;
struct pwdb_passwd *p, *oldp;
int updt;
if (argc<2) {
printf("Usage: update_user username\n");
return(0);
}
username=argv[1];
oldp=pwdb_getpwnam(username);
if (oldp!=NULL)
updt=1;
else if ((oldp==NULL) && (pwdb_errno==PWDB_NOUSER))
updt=0;
else {
printf("pwdb_getpwnam return error: %s\n",pwdb_err2str(pwdb_errno));
return(0);
}
p=(struct pwdb_passwd *)malloc(sizeof(struct pwdb_passwd));
buf=NULL;
buflen=0;
p->pw_name=username;
chread=0;
while (1) {
printf("Password:"******"New user, so you must enter data\n");
if ((updt) && (chread<1)) {
p->pw_passwd=oldp->pw_passwd;
break;
}
if (chread>0) {
p->pw_passwd=(char *)malloc(sizeof(char)*(chread+1));
strncpy(p->pw_passwd,buf,chread);
p->pw_passwd[chread]='\0';
break;
}
}
chread=0;
while (1) {
printf("Uid:");
chread=getline(&buf,&buflen,stdin);
buf[chread]='\0'; chread--; /* remove '\n' included by getline */
if ((!updt) && (chread<1))
printf("New user, so you must enter data\n");
if ((updt) && (chread<1)) {
p->pw_uid=oldp->pw_uid;
break;
}
if (chread>0) {
p->pw_uid=atoi(buf);
break;
}
}
chread=0;
while (1) {
printf("Gid:");
chread=getline(&buf,&buflen,stdin);
buf[chread]='\0'; chread--; /* remove '\n' included by getline */
if ((!updt) && (chread<1))
printf("New user, so you must enter data\n");
if ((updt) && (chread<1)) {
p->pw_gid=oldp->pw_gid;
break;
}
if (chread>0) {
p->pw_gid=atoi(buf);
break;
}
}
chread=0;
while (1) {
printf("Real name:");
chread=getline(&buf,&buflen,stdin);
buf[chread]='\0'; chread--; /* remove '\n' included by getline */
if ((!updt) && (chread<1))
printf("New user, so you must enter data\n");
if ((updt) && (chread<1)) {
p->pw_gecos=oldp->pw_gecos;
break;
}
if (chread>0) {
p->pw_gecos=(char *)malloc(sizeof(char)*(chread+1));
strncpy(p->pw_gecos,buf,chread);
p->pw_gecos[chread]='\0';
break;
}
}
chread=0;
while (1) {
printf("Home directory:");
chread=getline(&buf,&buflen,stdin);
buf[chread]='\0'; chread--; /* remove '\n' included by getline */
if ((!updt) && (chread<1))
printf("New user, so you must enter data\n");
if ((updt) && (chread<1)) {
p->pw_dir=oldp->pw_dir;
break;
}
if (chread>0) {
p->pw_dir=(char *)malloc(sizeof(char)*(chread+1));
strncpy(p->pw_dir,buf,chread);
p->pw_dir[chread]='\0';
break;
}
}
chread=0;
while (1) {
printf("Shell:");
chread=getline(&buf,&buflen,stdin);
buf[chread]='\0'; chread--; /* remove '\n' included by getline */
if ((!updt) && (chread<1))
printf("New user, so you must enter data\n");
if ((updt) && (chread<1)) {
p->pw_shell=oldp->pw_shell;
break;
}
if (chread>0) {
p->pw_shell=(char *)malloc(sizeof(char)*(chread+1));
strncpy(p->pw_shell,buf,chread);
p->pw_shell[chread]='\0';
break;
}
}
chread=0;
while (1) {
printf("Failed:");
chread=getline(&buf,&buflen,stdin);
buf[chread]='\0'; chread--; /* remove '\n' included by getline */
if ((!updt) && (chread<1))
printf("New user, so you must enter data\n");
if ((updt) && (chread<1)) {
p->pw_failed=oldp->pw_failed;
break;
}
if (chread>0) {
p->pw_failed=atoi(buf);
break;
}
}
chread=0;
while (1) {
printf("Age:");
chread=getline(&buf,&buflen,stdin);
buf[chread]='\0'; chread--; /* remove '\n' included by getline */
if ((!updt) && (chread<1))
printf("New user, so you must enter data\n");
if ((updt) && (chread<1)) {
p->pw_age=oldp->pw_age;
break;
}
if (chread>0) {
p->pw_age=atoi(buf);
break;
}
}
if (pwdb_update_user(p)!=0) {
printf("pwdb_update_user returned error %s\n",pwdb_err2str(pwdb_errno));
}
return(0);
}