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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
#ifdef MALLOC_JEMALLOC
#undef MALLOC_JEMALLOC
#endif
#include <monkey/monkey.h>
#include <monkey/mk_core.h>
#include <getopt.h>
#include "sha1.h"
#include "base64.h"
#define MAX_LINE_LEN 256
struct mk_passwd_user {
char *row;
struct mk_list _head;
};
/* Store a file as a linked list of its lines */
static struct mk_list passwd_file;
/* Load file to memory from disk
* If create_file == MK_TRUE, the file will be rewritten */
void read_file(char *filename, int create_file)
{
FILE *filein = fopen(filename, "r");
char line[MAX_LINE_LEN];
struct mk_passwd_user *entry;
mk_list_init(&passwd_file);
if (filein == NULL && create_file == MK_FALSE) {
printf("Error opening file %s\n", filename);
exit(1);
}
if (filein == NULL || create_file == MK_TRUE) {
if (filein != NULL)
fclose(filein);
return;
}
while (fgets(line, MAX_LINE_LEN, filein) != NULL) {
entry = malloc(sizeof(*entry));
entry->row = strdup(line);
mk_list_add(&entry->_head, &passwd_file);
}
fclose(filein);
}
/* Store data to disk */
void dump_file(char *filename)
{
FILE *fileout = fopen(filename, "w");
struct mk_list *it, *tmp;
struct mk_passwd_user *entry;
if (!fileout) {
printf("Error opening: %s", filename);
exit(EXIT_FAILURE);
}
mk_list_foreach_safe(it, tmp, &passwd_file) {
entry = mk_list_entry(it, struct mk_passwd_user, _head);
fprintf(fileout, "%s", entry->row);
mk_list_del(&entry->_head);
free(entry->row);
free(entry);
}
fclose(fileout);
}
/* Return sha1 hash of password
* A new line is appended at the hash */
unsigned char *sha1_hash(const char *password)
{
unsigned char sha_hash[20];
blk_SHA_CTX sha;
blk_SHA1_Init(&sha);
blk_SHA1_Update(&sha, password, strlen(password));
blk_SHA1_Final(sha_hash, &sha);
return base64_encode(sha_hash, 20, NULL);
}
void update_user(const char *username, const char *password, int create_user)
{
struct mk_list *it, *tmp;
struct mk_passwd_user *entry;
unsigned char *hash_passwd;
int i;
mk_list_foreach_safe(it, tmp, &passwd_file) {
entry = mk_list_entry(it, struct mk_passwd_user, _head);
for (i = 0; entry->row[i] != '\0' && entry->row[i] != ':' && username[i] != '\0' && entry->row[i] == username[i]; i++);
if (entry->row[i] != ':' || username[i] != '\0')
continue;
/* Found a match */
/* Delete user */
if (create_user == MK_FALSE) {
printf("[-] Deleting user %s\n", username);
mk_list_del(&entry->_head);
free(entry->row);
free(entry);
return;
}
/* Update user */
printf("[+] Password changed for user %s\n", username);
hash_passwd = sha1_hash(password);
free(entry->row);
entry->row = malloc(512);
snprintf(entry->row, 512, "%s:{SHA1}%s", username, hash_passwd);
free(hash_passwd);
return;
}
/* Create user */
if (create_user == MK_TRUE) {
printf("[+] Adding user %s\n", username);
entry = malloc(sizeof(struct mk_passwd_user));
entry->row = malloc(512);
hash_passwd = sha1_hash(password);
snprintf(entry->row, 512, "%s:{SHA1}%s", username, hash_passwd);
free(hash_passwd);
mk_list_add(&entry->_head, &passwd_file);
}
}
static void print_help(int full_help)
{
printf("Usage: mk_passwd [-c] [-D] filename username password\n");
if (full_help == MK_TRUE) {
printf("\nOptions:\n");
printf(" -h, --help\tshow this help message and exit\n");
printf(" -c\t\tCreate a new mkpasswd file, overwriting any existing file.\n");
printf(" -D\t\tRemove the given user from the password file.\n");
}
}
int main(int argc, char *argv[])
{
int opt;
int create_user = MK_TRUE;
int create_file = MK_FALSE;
int show_help = MK_FALSE;
char *filename = NULL;
char *username = NULL;
char *password = NULL;
/* Command line options */
static const struct option long_opts[] = {
{"create", no_argument, NULL, 'c'},
{"delete_user", no_argument, NULL, 'D'},
{"help", no_argument, NULL, 'h'},
};
/* Parse options */
while ((opt = getopt_long(argc, argv, "hbDc", long_opts, NULL)) != -1) {
switch (opt) {
case 'c':
create_file = MK_TRUE;
break;
case 'D':
create_user = MK_FALSE;
break;
case 'h':
show_help = MK_TRUE;
break;
}
}
/* Retrieve filename, username and password */
while (optind < argc) {
if (filename == NULL)
filename = argv[optind++];
else if (username == NULL)
username = argv[optind++];
else if (password == NULL)
password = argv[optind++];
}
if (show_help == MK_TRUE) {
print_help(MK_TRUE);
exit(0);
}
/* If delete_user option is provided, do not provide a password */
if ((password != NULL) ^ (create_user == MK_TRUE)) {
print_help(MK_FALSE);
exit(1);
}
/* Process request */
read_file(filename, create_file);
update_user(username, password, create_user);
dump_file(filename);
return 0;
}
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